Additional Qt keyword conversion. (#299)

This comit is an addtion to pull request #295. Not all Qt keywords were included.

Co-authored-by: Walter Bormans <walter.bormans@paradoxcat.com>

.github/workflows/linux-builds.yml

@@ -16,6 +16,7 @@ jobs:
       run: |
         sudo apt-get update --fix-missing
         sudo apt-get install qt5-default
+        sudo apt-get install libqt5x11extras5-dev
     - name: qmake
       run: qmake
     - name: make

.gitignore

@@ -382,3 +382,4 @@ MigrationBackup/
 FodyWeavers.xsd
 / build
 /Settings.ini
+.vscode/settings.json

.settings/language.settings.xml

@@ -2,10 +2,13 @@
 <project>
 	<configuration id="cdt.managedbuild.toolchain.gnu.mingw.base.1119687795" name="Default">
 		<extension point="org.eclipse.cdt.core.LanguageSettingsProvider">
-			<provider-reference id="org.eclipse.cdt.managedbuilder.core.GCCBuiltinSpecsDetectorMinGW" ref="shared-provider"/>
 			<provider copy-of="extension" id="org.eclipse.cdt.ui.UserLanguageSettingsProvider"/>
 			<provider-reference id="org.eclipse.cdt.core.ReferencedProjectsLanguageSettingsProvider" ref="shared-provider"/>
 			<provider class="org.eclipse.cdt.managedbuilder.language.settings.providers.GCCBuildCommandParser" id="org.eclipse.cdt.managedbuilder.core.GCCBuildCommandParser" keep-relative-paths="false" name="CDT GCC Build Output Parser" parameter="(g?cc)|([gc]\+\+)|(clang)" prefer-non-shared="true"/>
+			<provider class="org.eclipse.cdt.managedbuilder.internal.language.settings.providers.GCCBuiltinSpecsDetectorMinGW" console="false" env-hash="-1242828358748104657" id="org.eclipse.cdt.managedbuilder.core.GCCBuiltinSpecsDetectorMinGW" keep-relative-paths="false" name="CDT GCC Built-in Compiler Settings MinGW" parameter="${COMMAND} ${FLAGS} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
+				<language-scope id="org.eclipse.cdt.core.gcc"/>
+				<language-scope id="org.eclipse.cdt.core.g++"/>
+			</provider>
 			<provider-reference id="org.eclipse.cdt.managedbuilder.core.MBSLanguageSettingsProvider" ref="shared-provider"/>
 		</extension>
 	</configuration>

.travis.yml

@@ -9,6 +9,8 @@ matrix:
     os: linux
     dist: trusty
     group: stable
+    before_install:
+      - sudo apt-get -y install libqt5x11extras5-dev
     addons:
       apt:
         sources:
@@ -18,6 +20,8 @@ matrix:
         packages:
         - qt55base
         - qt55tools
+        - qt55x11extras
+        - libqt5x11extras5-dev
         - gcc-9
         - g++-9
     script:
@@ -35,6 +39,8 @@ matrix:
     services:
         - xvfb
     compiler: gcc
+    before_install:
+      - sudo apt-get -y install libqt5x11extras5-dev
     addons:
       apt:
         sources:
@@ -44,6 +50,8 @@ matrix:
         packages:
         - qt514base
         - qt514tools
+        - qt514x11extras
+        - libqt5x11extras5-dev
         - gcc-9
         - g++-9
         - libc6-i386
@@ -65,7 +73,9 @@ matrix:
     services:
         - xvfb
     compiler: gcc
-    addons:
+    before_install:
+      - sudo apt-get -y install libqt5x11extras5-dev  
+    addons:  
       apt:
         sources:
         - ubuntu-toolchain-r-test
@@ -74,6 +84,8 @@ matrix:
         packages:
         - qt514base
         - qt514tools
+        - qt514x11extras
+        - libqt5x11extras5-dev
         - gcc-9
         - g++-9
         - libc6-i386
@@ -95,6 +107,8 @@ matrix:
     services:
         - xvfb
     compiler: gcc
+    before_install:
+      - sudo apt-get -y install libqt5x11extras5-dev
     addons:
       apt:
         sources:
@@ -104,6 +118,8 @@ matrix:
         packages:
         - qt514base
         - qt514tools
+        - qt514x11extras
+        - libqt5x11extras5-dev
         - gcc-9
         - g++-9
         - libc6-i386
@@ -131,6 +147,8 @@ matrix:
     services:
         - xvfb
     compiler: gcc
+    before_install:
+      - sudo apt-get -y install libqt5x11extras5-dev
     addons:
       apt:
         sources:
@@ -140,6 +158,8 @@ matrix:
         packages:
         - qt514base
         - qt514tools
+        - qt514x11extras
+        - libqt5x11extras5-dev
         - gcc-9
         - g++-9
         - libc6-i386

README.md

@@ -1,32 +1,54 @@
 # Advanced Docking System for Qt
 
-[![Build Status](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Docking-System.svg?branch=master)](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Docking-System)
+[![Build status](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/workflows/linux-builds/badge.svg)](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/actions?query=workflow%3Alinux-builds)
 [![Build status](https://ci.appveyor.com/api/projects/status/qcfb3cy932jw9mpy/branch/master?svg=true)](https://ci.appveyor.com/project/githubuser0xFFFF/qt-advanced-docking-system/branch/master)
 [![License: LGPL v2.1](https://img.shields.io/badge/License-LGPL%20v2.1-blue.svg)](gnu-lgpl-v2.1.md)
 
 [What's new](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/releases/latest) •
 [Documentation](doc/user-guide.md)
 
-Qt Advanced Docking System lets you create customizable layouts using a full 
-featured window docking system similar to what is found in many popular 
-integrated development environments (IDEs) such as Visual Studio. 
+Qt Advanced Docking System lets you create customizable layouts using a full
+featured window docking system similar to what is found in many popular
+integrated development environments (IDEs) such as Visual Studio.
 
 [![Video Advanced Docking](doc/advanced-docking_video.png)](https://www.youtube.com/watch?v=7pdNfafg3Qc)
 
-Everything is implemented with standard Qt functionality without any
-platform specific code. Basic usage of QWidgets and QLayouts and using basic 
-styles as much as possible.
+## New and Noteworthy
 
-This work is based on and inspired by the 
-[Advanced Docking System for Qt](https://github.com/mfreiholz/Qt-Advanced-Docking-System) 
-from Manuel Freiholz. I did an almost complete rewrite of his code to improve
-code quality, readibility and to fix all issues from the issue tracker 
-of his docking system project.
+The [release 3.7](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/releases/tag/3.7.0)
+adds the following features:
+
+- support for **Qt6.**
+- support for [empty dock area](doc/user-guide.md#empty-dock-area)
+
+The [release 3.6](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/releases/tag/3.6.0)
+adds some nice new features:
+
+- support for [central widget](doc/user-guide.md#central-widget) concept
+
+![Central Widget](doc/central_widget.gif)
+
+- support for [native floating widgets](doc/user-guide.md#floatingcontainerforcenativetitlebar-linux-only) on Linux
+
+![FloatingContainerForceNativeTitleBar true](doc/cfg_flag_FloatingContainerForceNativeTitleBar_true.png)
+
+Both features are contributions from ADS users. Read the [documentation](doc/user-guide.md)
+to learn more about both new features.
+
+The [release 3.5](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/releases/tag/3.5.0)
+adds the new [focus highlighting](doc/user-guide.md#focushighlighting) feature.
+This optional feature enables highlighting of the focused dock widget like you
+know it from Visual Studio.
+
+![FocusHighlighting](doc/cfg_flag_FocusHighlighting.gif)
+
+ [learn more...](doc/user-guide.md#focushighlighting)
 
 ## Features
 
 ### Overview
 
+- [New and Noteworthy](#new-and-noteworthy)
 - [Features](#features)
   - [Overview](#overview)
   - [Docking everywhere - no central widget](#docking-everywhere---no-central-widget)
@@ -38,7 +60,9 @@ of his docking system project.
   - [Tab-menu for easy handling of many tabbed dock widgets](#tab-menu-for-easy-handling-of-many-tabbed-dock-widgets)
   - [Many different ways to detach dock widgets](#many-different-ways-to-detach-dock-widgets)
   - [Supports deletion of dynamically created dock widgets](#supports-deletion-of-dynamically-created-dock-widgets)
+  - [Python PyQt5 Bindings](#python-pyqt5-bindings)
 - [Tested Compatible Environments](#tested-compatible-environments)
+  - [Supported Qt Versions](#supported-qt-versions)
   - [Windows](#windows)
   - [macOS](#macos)
   - [Linux](#linux)
@@ -55,6 +79,8 @@ of his docking system project.
   - [Qt Design Studio](#qt-design-studio)
   - [QmixElements](#qmixelements)
   - [ezEditor](#ezeditor)
+  - [D-Tect X](#d-tect-x)
+  - [HiveWE](#hivewe)
 
 ### Docking everywhere - no central widget
 
@@ -62,8 +88,8 @@ There is no central widget like in the Qt docking system. You can dock on every
 border of the main window or you can dock into each dock area - so you are
 free to dock almost everywhere.
 
-![Dropping widgets](doc/preview-dragndrop.png)\
-\
+![Dropping widgets](doc/preview-dragndrop.png)
+
 ![Dropping widgets](doc/preview-dragndrop_dark.png)
 
 ### Docking inside floating windows
@@ -71,8 +97,8 @@ free to dock almost everywhere.
 There is no difference between the main window and a floating window. Docking
 into floating windows is supported.
 
-![Docking inside floating windows](doc/floating-widget-dragndrop.png)\
-\
+![Docking inside floating windows](doc/floating-widget-dragndrop.png)
+
 ![Docking inside floating windows](doc/floating-widget-dragndrop_dark.png)
 
 ### Grouped dragging
@@ -81,8 +107,8 @@ When dragging the titlebar of a dock, all the tabs that are tabbed with it are
 going to be dragged. So you can move complete groups of tabbed widgets into
 a floating widget or from one dock area to another one.
 
-![Grouped dragging](doc/grouped-dragging.gif)\
-\
+![Grouped dragging](doc/grouped-dragging.gif)
+
 ![Grouped dragging](doc/grouped-dragging_dark.png)
 
 ### Perspectives for fast switching of the complete main window layout
@@ -93,13 +119,13 @@ perspective to make your own custom perspective. Later you can simply
 select a perspective from the perspective list to quickly switch the complete 
 main window layout.
 
-![Perspective](doc/perspectives.gif)\
-\
+![Perspective](doc/perspectives.gif)
+
 ![Perspective](doc/perspectives_dark.png)
 
 ### Opaque and non-opaque splitter resizing
 
-The advanced docking system uses standard QSplitters as resize separators and thus supports opaque and non-opaque resizing functionality of QSplitter. In some rare cases, for very complex widgets or on slow machines resizing via separator on the fly may cause flicking and glaring of rendered content inside a widget. The global dock manager flag `OpaqueSplitterResize` configures the resizing behaviour of the splitters. If this flag is set, then widgets are resized dynamically (opaquely) while interactively moving the splitters. 
+The advanced docking system uses standard QSplitters as resize separators and thus supports opaque and non-opaque resizing functionality of QSplitter. In some rare cases, for very complex widgets or on slow machines resizing via separator on the fly may cause flicking and glaring of rendered content inside a widget. The global dock manager flag `OpaqueSplitterResize` configures the resizing behaviour of the splitters. If this flag is set, then widgets are resized dynamically (opaquely) while interactively moving the splitters.
 
 ![Opaque resizing](doc/opaque_resizing.gif)
 
@@ -136,8 +162,26 @@ You can detach dock widgets and also dock areas in the following ways:
 
 Normally clicking the close button of a dock widget will just hide the widget and the user can show it again using the toggleView() action of the dock widget. This is meant for user interfaces with a static amount of widgets. But the advanced docking system also supports dynamic dock widgets that will get deleted on close. If you set the dock widget flag `DockWidgetDeleteOnClose` for a certain dock widget, then it will be deleted as soon as you close this dock widget. This enables the implementation of user interfaces with dynamically created editors, like in word processing applications or source code development tools.
 
+### Python PyQt5 Bindings
+
+![Python Logo](doc/python_logo.png)
+
+The Advanced Docking System comes with a complete Python integration based on
+PyQt5 bindings. The package is available via [conda-forge](https://github.com/conda-forge/pyqtads-feedstock). The python integration has been contributed to this project
+by the following people:
+
+- [n-elie](https://github.com/n-elie)
+- [Hugo Slepicka](https://github.com/hhslepicka)
+- [K Lauer](https://github.com/klauer)
+
+Latest working version: [3.5.2](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/releases/tag/3.5.2)
+
 ## Tested Compatible Environments
 
+### Supported Qt Versions
+
+The library supports **Qt5** and **Qt6**.
+
 ### Windows
 
 Windows 10 [![Build status](https://ci.appveyor.com/api/projects/status/qcfb3cy932jw9mpy/branch/master?svg=true)](https://ci.appveyor.com/project/githubuser0xFFFF/qt-advanced-docking-system/branch/master)
@@ -154,15 +198,23 @@ The application can be compiled for macOS. A user reported, that the library wor
 
 ### Linux
 
-Ubuntu [![Build Status](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Docking-System.svg?branch=master)](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Docking-System)
+[![Build Status](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Docking-System.svg?branch=master)](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Docking-System)
 [![Build status](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/workflows/linux-builds/badge.svg)](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/actions?query=workflow%3Alinux-builds)
 
-The application can be compiled for Linux and has been developed and tested with **Kubuntu 18.04** and **Kubuntu 19.10**.
+Unfortunately, there is no such thing as a Linux operating system. Linux is a heterogeneous environment with a variety of different distributions. So it is not possible to support "Linux" like this is possible for Windows. It is only possible to support and test a small subset of Linux distributions. The library can be compiled for and has been developed and tested with the following Linux distributions:
 
+- **Kubuntu 18.04 and 19.10**
+- **Ubuntu 18.04, 19.10 and 20.04**
+
+There are some requirements for the Linux distribution that have to be met:
+
+- an X server that supports ARGB visuals and a compositing window manager. This is required to display the translucent dock overlays ([https://doc.qt.io/qt-5/qwidget.html#creating-translucent-windows](https://doc.qt.io/qt-5/qwidget.html#creating-translucent-windows)). If your Linux distribution does not support this, or if you disable this feature, you will very likely see issue [#95](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/issues/95).
+- Wayland is not properly supported by Qt yet. If you use Wayland, then you should set the session type to x11: `XDG_SESSION_TYPE=x11 ./AdvancedDockingSystemDemo`. You will find more details about this in issue [#288](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/issues/288).
+
+Screenshot Kubuntu:
 ![Advanced Docking on Kubuntu Linux](doc/linux_kubuntu_1804.png)
 
-and with **Ubuntu 19.10**
-
+Screenshot Ubuntu:
 ![Advanced Docking on Ubuntu Linux](doc/linux_ubuntu_1910.png)
 
 ## Build
@@ -247,7 +299,13 @@ MainWindow::~MainWindow()
 ## Developers
 
 - Uwe Kindler, Project Maintainer
-- Manuel Freiholz 
+- Manuel Freiholz
+
+This work is based on and inspired by the 
+[Advanced Docking System for Qt](https://github.com/mfreiholz/Qt-Advanced-Docking-System)
+from Manuel Freiholz. I did an almost complete rewrite of his code to improve
+code quality, readibility and to fix all issues from the issue tracker
+of his docking system project.
 
 ## License information
 
@@ -288,7 +346,7 @@ If this project help you reduce time to develop or if you just like it, you can
 From version 4.12 on, Qt Creator uses the Advanced Docking Framework for its
 Qt Quick Designer. This improves the usability when using multiple screens.
 
-![Qt Creator](doc/qtcreator.png)
+![Qt Creator](doc/showcase_qtcreator.png)
 
 ### [Qt Design Studio](https://www.qt.io/ui-design-tools)
 
@@ -296,7 +354,7 @@ Taken from the [Qt Blog](https://www.qt.io/blog/qt-design-studio-1.5-beta-releas
 
 > The most obvious change in [Qt Design Studio 1.5](https://www.qt.io/blog/qt-design-studio-1.5-beta-released) is the integration of dock widgets using the Qt Advanced Docking System. This allows the user to fully customize the workspace and also to undock any view into its own top level window. This especially improves the usability when using multiple screens.
 
-![Qt Design Studio](doc/qt_design_studio.png)
+![Qt Design Studio](doc/showcase_qt_design_studio.png)
 
 ### [QmixElements](https://www.cetoni.com/products/qmixelements/)
 
@@ -304,7 +362,7 @@ The QmixElements software from [CETONI](https://www.cetoni.com) is a comprehensi
 plugin-based and modular laboratory automation software for controlling CETONI devices using a joint graphical user interface. The software features a powerful script system to automate processes. This [blog post](https://www.cetoni.com/blog/qmixelements-advanced-docking-system/) gives a nice overview about the use of the Qt
 Advanced Docking System in the QmixElements sofware.
 
-![QmixElements](doc/qmix_elements.png)
+![QmixElements](doc/showcase_qmix_elements.png)
 
 ### [ezEditor](https://github.com/ezEngine/ezEngine)
 
@@ -312,4 +370,24 @@ The ezEditor is a full blown graphical editor used for editing scenes and
 importing and authoring assets for the [ezEngine](https://github.com/ezEngine/ezEngine) -
 an open source C++ game engine in active development.
 
-![ezEditor](doc/ezEngine_editor.png)
+![ezEditor](doc/showcase_ezEngine_editor.png)
+
+### [D-Tect X](https://www.duerr-ndt.com/products/ndt-software/d-tect-xray-inspection-software.html)
+
+D-Tect X is a X-ray inspection software for industrial radiography. It is a state-of-the-art 64-bit application which supports GPU (Graphics Processing Unit) acceleration and takes full advantage of computers with multiple CPU cores. A large set of tools assist the user in image analysis and evaluation. Thanks to the Qt Advanced Docking System the flexible and intuitive user interface can be completely customized to  each user’s preference.
+
+[learn more...](https://www.duerr-ndt.com/products/ndt-software/d-tect-xray-inspection-software.html)
+
+![D-TectX](doc/showcase_d-tect-x.jpg)
+
+### [HiveWE](https://github.com/stijnherfst/HiveWE)
+
+HiveWE is a Warcraft III world editor. It focusses on speed and ease of use,
+especially for large maps where the regular World Editor is often too slow and clunky.
+It has a JASS editor with syntax hightlighting, tabs, code completion and more.
+The JASS editor uses the Qt Advanced Docking System for the management and layout
+of the open editor windows.
+
+[learn more...](https://github.com/stijnherfst/HiveWE)
+
+![HiveWE](doc/showcase_hivewe.png)

ads.pri

@@ -0,0 +1,28 @@
+
+lessThan(QT_MAJOR_VERSION, 6) {
+    CONFIG(debug, debug|release){
+        win32 {
+            LIBS += -lqtadvanceddockingd
+        }
+        else:mac {
+            LIBS += -lqtadvanceddocking_debug
+        }
+        else {
+            LIBS += -lqtadvanceddocking
+        }
+    }
+    else{
+        LIBS += -lqtadvanceddocking
+    }
+}
+else {
+    # qt$$qtLibraryTarget(qtadvanceddocking) does not produce an advanceddockingd.dll file on Windows
+    # for Qt6 - I don't know if this is a bug and I have to investigate
+    LIBS += -lqtadvanceddocking
+}
+
+
+unix:!macx {
+    LIBS += -lxcb
+    QT += x11extras
+}

adsConfig.cmake

@@ -2,4 +2,7 @@ include(CMakeFindDependencyMacro)
 find_dependency(Qt5Core ${REQUIRED_QT_VERSION} REQUIRED)
 find_dependency(Qt5Gui ${REQUIRED_QT_VERSION} REQUIRED)
 find_dependency(Qt5Widgets ${REQUIRED_QT_VERSION} REQUIRED)
+if(UNIX AND NOT APPLE)
+    find_dependency(Qt5X11Extras ${REQUIRED_QT_VERSION} REQUIRED)
+endif()
 include("${CMAKE_CURRENT_LIST_DIR}/adsTargets.cmake")

demo/MainWindow.cpp

@@ -58,11 +58,15 @@
 #include <QMessageBox>
 #include <QMenu>
 #include <QToolButton>
+#include <QToolBar>
+#include <QPointer>
 
 
 #ifdef Q_OS_WIN
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 #include <QAxWidget>
 #endif
+#endif
 
 #include <QMap>
 #include <QElapsedTimer>
@@ -78,35 +82,6 @@
 
 
 
-//============================================================================
-static ads::CDockWidget* createLongTextLabelDockWidget(QMenu* ViewMenu)
-{
-	static int LabelCount = 0;
-	QLabel* l = new QLabel();
-	l->setWordWrap(true);
-	l->setAlignment(Qt::AlignTop | Qt::AlignLeft);
-	l->setText(QString("Label %1 %2 - Lorem ipsum dolor sit amet, consectetuer adipiscing elit. "
-		"Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque "
-		"penatibus et magnis dis parturient montes, nascetur ridiculus mus. "
-		"Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. "
-		"Nulla consequat massa quis enim. Donec pede justo, fringilla vel, "
-		"aliquet nec, vulputate eget, arcu. In enim justo, rhoncus ut, "
-		"imperdiet a, venenatis vitae, justo. Nullam dictum felis eu pede "
-		"mollis pretium. Integer tincidunt. Cras dapibus. Vivamus elementum "
-		"semper nisi. Aenean vulputate eleifend tellus. Aenean leo ligula, "
-		"porttitor eu, consequat vitae, eleifend ac, enim. Aliquam lorem ante, "
-		"dapibus in, viverra quis, feugiat a, tellus. Phasellus viverra nulla "
-		"ut metus varius laoreet.")
-		.arg(LabelCount)
-		.arg(QTime::currentTime().toString("hh:mm:ss:zzz")));
-
-	ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Label %1").arg(LabelCount++));
-	DockWidget->setWidget(l);
-	ViewMenu->addAction(DockWidget->toggleViewAction());
-	return DockWidget;
-}
-
-
 /**
  * Function returns a features string with closable (c), movable (m) and floatable (f)
  * features. i.e. The following string is for a not closable but movable and floatable
@@ -138,7 +113,7 @@ static void appendFeaturStringToWindowTitle(ads::CDockWidget* DockWidget)
 static QIcon svgIcon(const QString& File)
 {
 	// This is a workaround, because in item views SVG icons are not
-	// properly scaled an look blurry or pixelate
+	// properly scaled and look blurry or pixelate
 	QIcon SvgIcon(File);
 	SvgIcon.addPixmap(SvgIcon.pixmap(92));
 	return SvgIcon;
@@ -164,71 +139,6 @@ public:
 };
 
 
-//============================================================================
-static ads::CDockWidget* createCalendarDockWidget(QMenu* ViewMenu)
-{
-	static int CalendarCount = 0;
-	QCalendarWidget* w = new QCalendarWidget();
-	ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Calendar %1").arg(CalendarCount++));
-	// The following lines are for testing the setWidget() and takeWidget()
-	// functionality
-	DockWidget->setWidget(w);
-	DockWidget->setWidget(w); // what happens if we set a widget if a widget is already set
-	DockWidget->takeWidget(); // we remove the widget
-	DockWidget->setWidget(w); // and set the widget again - there should be no error
-	DockWidget->setToggleViewActionMode(ads::CDockWidget::ActionModeShow);
-	DockWidget->setIcon(svgIcon(":/adsdemo/images/date_range.svg"));
-	ViewMenu->addAction(DockWidget->toggleViewAction());
-	return DockWidget;
-}
-
-
-//============================================================================
-static ads::CDockWidget* createFileSystemTreeDockWidget(QMenu* ViewMenu)
-{
-	static int FileSystemCount = 0;
-	QTreeView* w = new QTreeView();
-	w->setFrameShape(QFrame::NoFrame);
-	QFileSystemModel* m = new QFileSystemModel(w);
-	m->setRootPath(QDir::currentPath());
-	w->setModel(m);
-	ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Filesystem %1")
-		.arg(FileSystemCount++));
-	DockWidget->setWidget(w);
-	ViewMenu->addAction(DockWidget->toggleViewAction());
-    return DockWidget;
-}
-
-//============================================================================
-static ads::CDockWidget* createEditorWidget(QMenu* ViewMenu)
-{
-	static int EditorCount = 0;
-	QPlainTextEdit* w = new QPlainTextEdit();
-	w->setPlaceholderText("This is an editor. If you close the editor, it will be "
-		"deleted. Enter your text here.");
-	w->setStyleSheet("border: none");
-	ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Editor %1").arg(EditorCount++));
-	DockWidget->setWidget(w);
-	DockWidget->setIcon(svgIcon(":/adsdemo/images/edit.svg"));
-	DockWidget->setFeature(ads::CDockWidget::CustomCloseHandling, true);
-	ViewMenu->addAction(DockWidget->toggleViewAction());
-
-	QMenu* OptionsMenu = new QMenu(DockWidget);
-	OptionsMenu->setTitle(QObject::tr("Options"));
-	OptionsMenu->setToolTip(OptionsMenu->title());
-	OptionsMenu->setIcon(svgIcon(":/adsdemo/images/custom-menu-button.svg"));
-	auto MenuAction = OptionsMenu->menuAction();
-	// The object name of the action will be set for the QToolButton that
-	// is created in the dock area title bar. You can use this name for CSS
-	// styling
-	MenuAction->setObjectName("optionsMenu");
-	DockWidget->setTitleBarActions({OptionsMenu->menuAction()});
-	auto a = OptionsMenu->addAction(QObject::tr("Clear Editor"));
-	w->connect(a, SIGNAL(triggered()), SLOT(clear()));
-
-	return DockWidget;
-}
-
 
 //===========================================================================
 /**
@@ -246,58 +156,6 @@ public:
 };
 
 
-//============================================================================
-static ads::CDockWidget* createTableWidget(QMenu* ViewMenu)
-{
-	static int TableCount = 0;
-	auto w = new CMinSizeTableWidget();
-	ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Table %1").arg(TableCount++));
-	static int colCount = 5;
-	static int rowCount = 30;
-	w->setColumnCount(colCount);
-	w->setRowCount(rowCount);
-	for (int col = 0; col < colCount; ++col)
-	{
-	  w->setHorizontalHeaderItem(col, new QTableWidgetItem(QString("Col %1").arg(col+1)));
-	  for (int row = 0; row < rowCount; ++row)
-	  {
-		 w->setItem(row, col, new QTableWidgetItem(QString("T %1-%2").arg(row + 1).arg(col+1)));
-	  }
-	}
-	DockWidget->setWidget(w);
-	DockWidget->setIcon(svgIcon(":/adsdemo/images/grid_on.svg"));
-	DockWidget->setMinimumSizeHintMode(ads::CDockWidget::MinimumSizeHintFromContent);
-	auto ToolBar = DockWidget->createDefaultToolBar();
-	auto Action = ToolBar->addAction(svgIcon(":/adsdemo/images/fullscreen.svg"), "Toggle Fullscreen");
-	QObject::connect(Action, &QAction::triggered, [=]()
-		{
-			if (DockWidget->isFullScreen())
-			{
-				DockWidget->showNormal();
-			}
-			else
-			{
-				DockWidget->showFullScreen();
-			}
-		});
-	ViewMenu->addAction(DockWidget->toggleViewAction());
-	return DockWidget;
-}
-
-
-#ifdef Q_OS_WIN
-//============================================================================
-static ads::CDockWidget* createActiveXWidget(QMenu* ViewMenu, QWidget* parent = nullptr)
-{
-   static int ActiveXCount = 0;
-   QAxWidget* w = new QAxWidget("{6bf52a52-394a-11d3-b153-00c04f79faa6}", parent);
-   ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Active X %1").arg(ActiveXCount++));
-   DockWidget->setWidget(w);
-   ViewMenu->addAction(DockWidget->toggleViewAction());
-   return DockWidget;
-}
-#endif
-
 
 //============================================================================
 /**
@@ -311,6 +169,9 @@ struct MainWindowPrivate
 	QWidgetAction* PerspectiveListAction = nullptr;
 	QComboBox* PerspectiveComboBox = nullptr;
 	ads::CDockManager* DockManager = nullptr;
+	ads::CDockWidget* WindowTitleTestDockWidget = nullptr;
+	QPointer<ads::CDockWidget> LastDockedEditor;
+	QPointer<ads::CDockWidget> LastCreatedFloatingEditor;
 
 	MainWindowPrivate(CMainWindow* _public) : _this(_public) {}
 
@@ -343,14 +204,183 @@ struct MainWindowPrivate
 	 * Restore the perspective listo of the dock manager
 	 */
 	void restorePerspectives();
+
+	/**
+	 * Creates a dock widget with a file system tree view
+	 */
+	ads::CDockWidget* createFileSystemTreeDockWidget()
+	{
+		static int FileSystemCount = 0;
+		QTreeView* w = new QTreeView();
+		w->setFrameShape(QFrame::NoFrame);
+		QFileSystemModel* m = new QFileSystemModel(w);
+		m->setRootPath(QDir::currentPath());
+		w->setModel(m);
+		ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Filesystem %1")
+			.arg(FileSystemCount++));
+		DockWidget->setWidget(w);
+		ui.menuView->addAction(DockWidget->toggleViewAction());
+		// We disable focus to test focus highlighting if the dock widget content
+		// does not support focus
+		w->setFocusPolicy(Qt::NoFocus);
+		auto ToolBar = DockWidget->createDefaultToolBar();
+		ToolBar->addAction(ui.actionSaveState);
+		ToolBar->addAction(ui.actionRestoreState);
+		return DockWidget;
+	}
+
+	/**
+	 * Create a dock widget with a QCalendarWidget
+	 */
+	ads::CDockWidget* createCalendarDockWidget()
+	{
+		static int CalendarCount = 0;
+		QCalendarWidget* w = new QCalendarWidget();
+		ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Calendar %1").arg(CalendarCount++));
+		// The following lines are for testing the setWidget() and takeWidget()
+		// functionality
+		DockWidget->setWidget(w);
+		DockWidget->setWidget(w); // what happens if we set a widget if a widget is already set
+		DockWidget->takeWidget(); // we remove the widget
+		DockWidget->setWidget(w); // and set the widget again - there should be no error
+		DockWidget->setToggleViewActionMode(ads::CDockWidget::ActionModeShow);
+		DockWidget->setIcon(svgIcon(":/adsdemo/images/date_range.svg"));
+		ui.menuView->addAction(DockWidget->toggleViewAction());
+		auto ToolBar = DockWidget->createDefaultToolBar();
+		ToolBar->addAction(ui.actionSaveState);
+		ToolBar->addAction(ui.actionRestoreState);
+		return DockWidget;
+	}
+
+
+	/**
+	 * Create dock widget with a text label
+	 */
+	ads::CDockWidget* createLongTextLabelDockWidget()
+	{
+		static int LabelCount = 0;
+		QLabel* l = new QLabel();
+		l->setWordWrap(true);
+		l->setAlignment(Qt::AlignTop | Qt::AlignLeft);
+		l->setText(QString("Label %1 %2 - Lorem ipsum dolor sit amet, consectetuer adipiscing elit. "
+			"Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque "
+			"penatibus et magnis dis parturient montes, nascetur ridiculus mus. "
+			"Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. "
+			"Nulla consequat massa quis enim. Donec pede justo, fringilla vel, "
+			"aliquet nec, vulputate eget, arcu. In enim justo, rhoncus ut, "
+			"imperdiet a, venenatis vitae, justo. Nullam dictum felis eu pede "
+			"mollis pretium. Integer tincidunt. Cras dapibus. Vivamus elementum "
+			"semper nisi. Aenean vulputate eleifend tellus. Aenean leo ligula, "
+			"porttitor eu, consequat vitae, eleifend ac, enim. Aliquam lorem ante, "
+			"dapibus in, viverra quis, feugiat a, tellus. Phasellus viverra nulla "
+			"ut metus varius laoreet.")
+			.arg(LabelCount)
+			.arg(QTime::currentTime().toString("hh:mm:ss:zzz")));
+
+		ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Label %1").arg(LabelCount++));
+		DockWidget->setWidget(l);
+		ui.menuView->addAction(DockWidget->toggleViewAction());
+		return DockWidget;
+	}
+
+
+	/**
+	 * Creates as imple editor widget
+	 */
+	ads::CDockWidget* createEditorWidget()
+	{
+		static int EditorCount = 0;
+		QPlainTextEdit* w = new QPlainTextEdit();
+		w->setPlaceholderText("This is an editor. If you close the editor, it will be "
+			"deleted. Enter your text here.");
+		w->setStyleSheet("border: none");
+		ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Editor %1").arg(EditorCount++));
+		DockWidget->setWidget(w);
+		DockWidget->setIcon(svgIcon(":/adsdemo/images/edit.svg"));
+		DockWidget->setFeature(ads::CDockWidget::CustomCloseHandling, true);
+		ui.menuView->addAction(DockWidget->toggleViewAction());
+
+		QMenu* OptionsMenu = new QMenu(DockWidget);
+		OptionsMenu->setTitle(QObject::tr("Options"));
+		OptionsMenu->setToolTip(OptionsMenu->title());
+		OptionsMenu->setIcon(svgIcon(":/adsdemo/images/custom-menu-button.svg"));
+		auto MenuAction = OptionsMenu->menuAction();
+		// The object name of the action will be set for the QToolButton that
+		// is created in the dock area title bar. You can use this name for CSS
+		// styling
+		MenuAction->setObjectName("optionsMenu");
+		DockWidget->setTitleBarActions({OptionsMenu->menuAction()});
+		auto a = OptionsMenu->addAction(QObject::tr("Clear Editor"));
+		w->connect(a, SIGNAL(triggered()), SLOT(clear()));
+
+		return DockWidget;
+	}
+
+	/**
+	 * Create a table widget
+	 */
+	ads::CDockWidget* createTableWidget()
+	{
+		static int TableCount = 0;
+		auto w = new CMinSizeTableWidget();
+		ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Table %1").arg(TableCount++));
+		static int colCount = 5;
+		static int rowCount = 30;
+		w->setColumnCount(colCount);
+		w->setRowCount(rowCount);
+		for (int col = 0; col < colCount; ++col)
+		{
+		  w->setHorizontalHeaderItem(col, new QTableWidgetItem(QString("Col %1").arg(col+1)));
+		  for (int row = 0; row < rowCount; ++row)
+		  {
+			 w->setItem(row, col, new QTableWidgetItem(QString("T %1-%2").arg(row + 1).arg(col+1)));
+		  }
+		}
+		DockWidget->setWidget(w);
+		DockWidget->setIcon(svgIcon(":/adsdemo/images/grid_on.svg"));
+		DockWidget->setMinimumSizeHintMode(ads::CDockWidget::MinimumSizeHintFromContent);
+		auto ToolBar = DockWidget->createDefaultToolBar();
+		auto Action = ToolBar->addAction(svgIcon(":/adsdemo/images/fullscreen.svg"), "Toggle Fullscreen");
+		QObject::connect(Action, &QAction::triggered, [=]()
+			{
+				if (DockWidget->isFullScreen())
+				{
+					DockWidget->showNormal();
+				}
+				else
+				{
+					DockWidget->showFullScreen();
+				}
+			});
+		ui.menuView->addAction(DockWidget->toggleViewAction());
+		return DockWidget;
+	}
+
+
+#ifdef Q_OS_WIN
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
+	/**
+	 * Creates an ActiveX widget on windows
+	 */
+	ads::CDockWidget* createActiveXWidget(QWidget* parent = nullptr)
+	{
+	   static int ActiveXCount = 0;
+	   QAxWidget* w = new QAxWidget("{6bf52a52-394a-11d3-b153-00c04f79faa6}", parent);
+	   ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Active X %1").arg(ActiveXCount++));
+	   DockWidget->setWidget(w);
+	   ui.menuView->addAction(DockWidget->toggleViewAction());
+	   return DockWidget;
+	}
+#endif
+#endif
+
 };
 
 //============================================================================
 void MainWindowPrivate::createContent()
 {
 	// Test container docking
-	QMenu* ViewMenu = ui.menuView;
-	auto DockWidget = createCalendarDockWidget(ViewMenu);
+	auto DockWidget = createCalendarDockWidget();
 	DockWidget->setFeature(ads::CDockWidget::DockWidgetClosable, false);
 	auto SpecialDockArea = DockManager->addDockWidget(ads::LeftDockWidgetArea, DockWidget);
 
@@ -360,19 +390,16 @@ void MainWindowPrivate::createContent()
 		//SpecialDockArea->setAllowedAreas({ads::LeftDockWidgetArea, ads::RightDockWidgetArea}); // just for testing
 	}
 
-	DockManager->addDockWidget(ads::LeftDockWidgetArea, createLongTextLabelDockWidget(ViewMenu));
-	auto FileSystemWidget = createFileSystemTreeDockWidget(ViewMenu);
-	auto ToolBar = FileSystemWidget->createDefaultToolBar();
-	ToolBar->addAction(ui.actionSaveState);
-	ToolBar->addAction(ui.actionRestoreState);
+	DockWidget = createLongTextLabelDockWidget();
+	WindowTitleTestDockWidget = DockWidget;
+	DockWidget->setFeature(ads::CDockWidget::DockWidgetFocusable, false);
+	DockManager->addDockWidget(ads::LeftDockWidgetArea, DockWidget);
+	auto FileSystemWidget = createFileSystemTreeDockWidget();
 	FileSystemWidget->setFeature(ads::CDockWidget::DockWidgetFloatable, false);
 	appendFeaturStringToWindowTitle(FileSystemWidget);
 	DockManager->addDockWidget(ads::BottomDockWidgetArea, FileSystemWidget);
 
-	FileSystemWidget = createFileSystemTreeDockWidget(ViewMenu);
-	ToolBar = FileSystemWidget->createDefaultToolBar();
-	ToolBar->addAction(ui.actionSaveState);
-	ToolBar->addAction(ui.actionRestoreState);
+	FileSystemWidget = createFileSystemTreeDockWidget();
 	FileSystemWidget->setFeature(ads::CDockWidget::DockWidgetMovable, false);
 	FileSystemWidget->setFeature(ads::CDockWidget::DockWidgetFloatable, false);
 	appendFeaturStringToWindowTitle(FileSystemWidget);
@@ -380,11 +407,14 @@ void MainWindowPrivate::createContent()
 	// Test custom factory - we inject a help button into the title bar
 	ads::CDockComponentsFactory::setFactory(new CCustomComponentsFactory());
 	auto TopDockArea = DockManager->addDockWidget(ads::TopDockWidgetArea, FileSystemWidget);
+	// Uncomment the next line if you would like to test the
+	// HideSingleWidgetTitleBar functionality
+	// TopDockArea->setDockAreaFlag(ads::CDockAreaWidget::HideSingleWidgetTitleBar, true);
 	ads::CDockComponentsFactory::resetDefaultFactory();
 
 	// We create a calendar widget and clear all flags to prevent the dock area
 	// from closing
-	DockWidget = createCalendarDockWidget(ViewMenu);
+	DockWidget = createCalendarDockWidget();
 	DockWidget->setTabToolTip(QString("Tab ToolTip\nHodie est dies magna"));
 	auto DockArea = DockManager->addDockWidget(ads::CenterDockWidgetArea, DockWidget, TopDockArea);
 
@@ -400,18 +430,18 @@ void MainWindowPrivate::createContent()
 	TitleBar->insertWidget(Index + 1, CustomButton);
 	QObject::connect(CustomButton, &QToolButton::clicked, [=]()
 	{
-		auto DockWidget = createEditorWidget(ui.menuView);
+		auto DockWidget = createEditorWidget();
 		DockWidget->setFeature(ads::CDockWidget::DockWidgetDeleteOnClose, true);
 		DockManager->addDockWidgetTabToArea(DockWidget, DockArea);
 		_this->connect(DockWidget, SIGNAL(closeRequested()), SLOT(onEditorCloseRequested()));
 	});
 
 	// Test dock area docking
-	auto RighDockArea = DockManager->addDockWidget(ads::RightDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), TopDockArea);
-	DockManager->addDockWidget(ads::TopDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
-	auto BottomDockArea = DockManager->addDockWidget(ads::BottomDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
-	DockManager->addDockWidget(ads::CenterDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
-	DockManager->addDockWidget(ads::CenterDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), BottomDockArea);
+	auto RighDockArea = DockManager->addDockWidget(ads::RightDockWidgetArea, createLongTextLabelDockWidget(), TopDockArea);
+	DockManager->addDockWidget(ads::TopDockWidgetArea, createLongTextLabelDockWidget(), RighDockArea);
+	auto BottomDockArea = DockManager->addDockWidget(ads::BottomDockWidgetArea, createLongTextLabelDockWidget(), RighDockArea);
+	DockManager->addDockWidget(ads::CenterDockWidgetArea, createLongTextLabelDockWidget(), RighDockArea);
+	DockManager->addDockWidget(ads::CenterDockWidgetArea, createLongTextLabelDockWidget(), BottomDockArea);
 
     auto Action = ui.menuTests->addAction(QString("Set %1 Floating").arg(DockWidget->windowTitle()));
     DockWidget->connect(Action, SIGNAL(triggered()), SLOT(setFloating()));
@@ -421,10 +451,12 @@ void MainWindowPrivate::createContent()
     DockWidget->connect(Action, SIGNAL(triggered()), SLOT(raise()));
 
 #ifdef Q_OS_WIN
-    if (!DockManager->configFlags().testFlag(ads::CDockManager::OpaqueUndocking))
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
+    if (!ads::CDockManager::testConfigFlag(ads::CDockManager::OpaqueUndocking))
     {
-    	DockManager->addDockWidget(ads::CenterDockWidgetArea, createActiveXWidget(ViewMenu), RighDockArea);
+    	DockManager->addDockWidget(ads::CenterDockWidgetArea, createActiveXWidget(), RighDockArea);
     }
+#endif
 #endif
 
 	for (auto DockWidget : DockManager->dockWidgetsMap())
@@ -479,6 +511,9 @@ void MainWindowPrivate::createActions()
 	ui.menuTests->addSeparator();
 	a = ui.menuTests->addAction("Show Status Dialog");
 	_this->connect(a, SIGNAL(triggered()), SLOT(showStatusDialog()));
+
+	a = ui.menuTests->addAction("Toggle Label 0 Window Title");
+	_this->connect(a, SIGNAL(triggered()), SLOT(toggleDockWidgetWindowTitle()));
 	ui.menuTests->addSeparator();
 }
 
@@ -571,11 +606,24 @@ CMainWindow::CMainWindow(QWidget *parent) :
 	// dock widget.
 	// CDockManager::setConfigFlag(CDockManager::HideSingleCentralWidgetTitleBar, true);
 
+	// uncomment the following line to enable focus highlighting of the dock
+	// widget that has the focus
+	CDockManager::setConfigFlag(CDockManager::FocusHighlighting, true);
+
+	// uncomment if you would like to enable an equal distribution of the
+	// available size of a splitter to all contained dock widgets
+	// CDockManager::setConfigFlag(CDockManager::EqualSplitOnInsertion, true);
+
 	// Now create the dock manager and its content
 	d->DockManager = new CDockManager(this);
 
+ #if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 	connect(d->PerspectiveComboBox, SIGNAL(activated(const QString&)),
 		d->DockManager, SLOT(openPerspective(const QString&)));
+ #else
+    connect(d->PerspectiveComboBox, SIGNAL(textActivated(const QString&)),
+        d->DockManager, SLOT(openPerspective(const QString&)));
+ #endif
 
 	d->createContent();
 	// Default window geometry - center on screen
@@ -601,6 +649,9 @@ CMainWindow::~CMainWindow()
 void CMainWindow::closeEvent(QCloseEvent* event)
 {
 	d->saveState();
+    // Delete dock manager here to delete all floating widgets. This ensures
+    // that all top level windows of the dock manager are properly closed
+    d->DockManager->deleteLater();
 	QMainWindow::closeEvent(event);
 }
 
@@ -656,13 +707,14 @@ void CMainWindow::onViewToggled(bool Open)
 //============================================================================
 void CMainWindow::onViewVisibilityChanged(bool Visible)
 {
+	Q_UNUSED(Visible);
 	auto DockWidget = qobject_cast<ads::CDockWidget*>(sender());
     if (!DockWidget)
     {
         return;
     }
 
-    qDebug() << DockWidget->objectName() << " visibilityChanged(" << Visible << ")";
+    //qDebug() << DockWidget->objectName() << " visibilityChanged(" << Visible << ")";
 }
 
 
@@ -672,18 +724,41 @@ void CMainWindow::createEditor()
 	QObject* Sender = sender();
 	QVariant vFloating = Sender->property("Floating");
 	bool Floating = vFloating.isValid() ? vFloating.toBool() : true;
-	auto DockWidget = createEditorWidget(d->ui.menuView);
+	auto DockWidget = d->createEditorWidget();
 	DockWidget->setFeature(ads::CDockWidget::DockWidgetDeleteOnClose, true);
+	DockWidget->setFeature(ads::CDockWidget::DockWidgetForceCloseWithArea, true);
     connect(DockWidget, SIGNAL(closeRequested()), SLOT(onEditorCloseRequested()));
 
     if (Floating)
     {
 		auto FloatingWidget = d->DockManager->addDockWidgetFloating(DockWidget);
 		FloatingWidget->move(QPoint(20, 20));
+		d->LastCreatedFloatingEditor = DockWidget;
+		d->LastDockedEditor.clear();
     }
     else
     {
-    	d->DockManager->addDockWidget(ads::TopDockWidgetArea, DockWidget);
+    	ads::CDockAreaWidget* EditorArea = d->LastDockedEditor ? d->LastDockedEditor->dockAreaWidget() : nullptr;
+    	if (EditorArea)
+    	{
+    		std::cout << "DockAreaCount before: " << EditorArea->dockContainer()->dockAreaCount() << std::endl;
+    		d->DockManager->setConfigFlag(ads::CDockManager::EqualSplitOnInsertion, true);
+    		d->DockManager->addDockWidget(ads::RightDockWidgetArea, DockWidget, EditorArea);
+    		std::cout << "DockAreaCount after: " << DockWidget->dockContainer()->dockAreaCount() << std::endl;
+    	}
+    	else
+    	{
+    		if (d->LastCreatedFloatingEditor)
+    		{
+    			std::cout << "LastCreated" << std::endl;
+    			d->DockManager->addDockWidget(ads::RightDockWidgetArea, DockWidget, d->LastCreatedFloatingEditor->dockAreaWidget());
+    		}
+    		else
+    		{
+    			d->DockManager->addDockWidget(ads::TopDockWidgetArea, DockWidget);
+    		}
+    	}
+    	d->LastDockedEditor = DockWidget;
     }
 }
 
@@ -705,7 +780,7 @@ void CMainWindow::onEditorCloseRequested()
 //============================================================================
 void CMainWindow::createTable()
 {
-	auto DockWidget = createTableWidget(d->ui.menuView);
+	auto DockWidget = d->createTableWidget();
 	DockWidget->setFeature(ads::CDockWidget::DockWidgetDeleteOnClose, true);
 	auto FloatingWidget = d->DockManager->addDockWidgetFloating(DockWidget);
     FloatingWidget->move(QPoint(40, 40));
@@ -719,3 +794,20 @@ void CMainWindow::showStatusDialog()
 	Dialog.exec();
 }
 
+
+//============================================================================
+void CMainWindow::toggleDockWidgetWindowTitle()
+{
+	QString Title = d->WindowTitleTestDockWidget->windowTitle();
+	int i = Title.indexOf(" (Test)");
+	if (-1 == i)
+	{
+		Title += " (Test)";
+	}
+	else
+	{
+		Title = Title.left(i);
+	}
+	d->WindowTitleTestDockWidget->setWindowTitle(Title);
+}
+

demo/MainWindow.h

@@ -64,6 +64,7 @@ private slots:
 	void createTable();
 	void onEditorCloseRequested();
 	void showStatusDialog();
+	void toggleDockWidgetWindowTitle();
 };
 
 #endif // MAINWINDOW_H

demo/demo.pro

@@ -4,8 +4,12 @@ TARGET = AdvancedDockingSystemDemo
 DESTDIR = $${ADS_OUT_ROOT}/lib
 QT += core gui widgets
 
-win32 {
-QT += axcontainer
+include(../ads.pri)
+
+lessThan(QT_MAJOR_VERSION, 6) {
+    win32 {
+        QT += axcontainer
+    }
 }
 
 CONFIG += c++14
@@ -34,21 +38,6 @@ RESOURCES += demo.qrc
 
 LIBS += -L$${ADS_OUT_ROOT}/lib
 
-# Dependency: AdvancedDockingSystem (shared)
-CONFIG(debug, debug|release){
-    win32 {
-        LIBS += -lqtadvanceddockingd
-    }
-    else:mac {
-        LIBS += -lqtadvanceddocking_debug
-    }
-    else {
-        LIBS += -lqtadvanceddocking
-    }
-}
-else{
-    LIBS += -lqtadvanceddocking
-}
 
 INCLUDEPATH += ../src
 DEPENDPATH += ../src

demo/demo.py

@@ -10,11 +10,11 @@ from PyQt5.QtCore import (QCoreApplication, QDir, Qt, QSettings, QSignalBlocker,
                           QtCriticalMsg, QtFatalMsg, QSize)
 from PyQt5.QtGui import (QGuiApplication, QIcon, QCloseEvent)
 from PyQt5.QtWidgets import (QCalendarWidget, QFileSystemModel, QFrame, QLabel,
-                            QMenu, QTreeView, QAction, QWidgetAction,
-                            QComboBox, QStyle, QSizePolicy, QInputDialog, QMenu,
-                            QToolButton, QWidget, QPlainTextEdit,
-                            QTableWidget, QTableWidgetItem, QApplication,
-                            QMessageBox)
+                             QMenu, QTreeView, QAction, QWidgetAction,
+                             QComboBox, QStyle, QSizePolicy, QInputDialog, QMenu,
+                             QToolButton, QWidget, QPlainTextEdit,
+                             QTableWidget, QTableWidgetItem, QApplication,
+                             QMessageBox)
 try:
     from PyQt5.QAxContainer import QAxWidget
 except ImportError:
@@ -48,7 +48,7 @@ def features_string(dock_widget: QtAds.CDockWidget) -> str:
     f = dock_widget.features()
     closable = f & QtAds.CDockWidget.DockWidgetClosable
     movable = f & QtAds.CDockWidget.DockWidgetMovable
-    floatable = f &QtAds.CDockWidget.DockWidgetFloatable
+    floatable = f & QtAds.CDockWidget.DockWidgetFloatable
     
     return "c{} m{} f{}".format("+" if closable else "-",
                                 "+" if movable else "-",
@@ -65,95 +65,11 @@ def append_feature_string_to_window_title(dock_widget: QtAds.CDockWidget):
 def svg_icon(filename: str):
     '''Helper function to create an SVG icon'''
     # This is a workaround, because because in item views SVG icons are not
-    # properly scaled an look blurry or pixelate
+    # properly scaled and look blurry or pixelate
     icon = QIcon(filename)
     icon.addPixmap(icon.pixmap(92))
     return icon
-    
 
-def create_long_text_label_dock_widget(view_menu: QMenu) -> QtAds.CDockWidget:
-    label = QLabel()
-    label.setWordWrap(True)
-    label.setAlignment(Qt.AlignTop | Qt.AlignLeft)
-    label.setText('''\
-Label {} {} - Lorem ipsum dolor sit amet, consectetuer
-adipiscing elit.  Aenean commodo ligula eget dolor. Aenean massa. Cum
-sociis natoque penatibus et magnis dis parturient montes, nascetur
-ridiculus mus.  Donec quam felis, ultricies nec, pellentesque eu, pretium
-quis, sem.  Nulla consequat massa quis enim. Donec pede justo, fringilla
-vel, aliquet nec, vulputate eget, arcu. In enim justo, rhoncus ut,
-imperdiet a, venenatis vitae, justo. Nullam dictum felis eu pede mollis
-pretium. Integer tincidunt. Cras dapibus. Vivamus elementum semper nisi.
-Aenean vulputate eleifend tellus. Aenean leo ligula, porttitor eu,
-consequat vitae, eleifend ac, enim. Aliquam lorem ante, dapibus in, viverra
-quis, feugiat a, tellus. Phasellus viverra nulla ut metus varius laoreet.
-    '''.format(_State.label_count, datetime.datetime.now().strftime("%H:%M:%S:%f")))
-    dock_widget = QtAds.CDockWidget("Label {}".format(_State.label_count))
-    _State.label_count += 1
-    dock_widget.setWidget(label)
-
-    view_menu.addAction(dock_widget.toggleViewAction())
-    return dock_widget
-
-
-def create_calendar_dock_widget(view_menu: QMenu) -> QtAds.CDockWidget:
-    widget = QCalendarWidget()
-
-    dock_widget = QtAds.CDockWidget("Calendar {}".format(_State.calendar_count))
-    _State.calendar_count += 1
-    # The following lines are for testing the setWidget() and takeWidget()
-    # functionality
-    dock_widget.setWidget(widget)
-    dock_widget.setWidget(widget)  # what happens if we set a widget if a widget is already set
-    dock_widget.takeWidget()  # we remove the widget
-    dock_widget.setWidget(widget)  # and set the widget again - there should be no error
-    dock_widget.setToggleViewActionMode(QtAds.CDockWidget.ActionModeShow)
-    dock_widget.setIcon(svg_icon(":/adsdemo/images/date_range.svg"))
-    view_menu.addAction(dock_widget.toggleViewAction())
-    return dock_widget
-
-
-def create_file_system_tree_dock_widget(view_menu: QMenu) -> QtAds.CDockWidget:
-    widget = QTreeView()
-    widget.setFrameShape(QFrame.NoFrame)
-
-    m = QFileSystemModel(widget)
-    m.setRootPath(QDir.currentPath())
-    widget.setModel(m)
-
-    dock_widget = QtAds.CDockWidget("Filesystem {}".format(_State.file_system_count))
-    _State.file_system_count += 1
-    dock_widget.setWidget(widget)
-    view_menu.addAction(dock_widget.toggleViewAction())
-    return dock_widget
- 
- 
-def create_editor_widget(view_menu: QMenu) -> QtAds.CDockWidget: 
-    widget = QPlainTextEdit()
-    widget.setPlaceholderText("This is an editor. If you close the editor, it will be "
-        "deleted. Enter your text here.")
-    widget.setStyleSheet("border: none")
-    dock_widget = QtAds.CDockWidget("Editor {}".format(_State.editor_count))
-    _State.editor_count += 1
-    dock_widget.setWidget(widget)
-    dock_widget.setIcon(svg_icon(":/adsdemo/images/edit.svg"))
-    dock_widget.setFeature(QtAds.CDockWidget.CustomCloseHandling, True)
-    view_menu.addAction(dock_widget.toggleViewAction())
-
-    options_menu = QMenu(dock_widget)
-    options_menu.setTitle("Options")
-    options_menu.setToolTip(options_menu.title())
-    options_menu.setIcon(svg_icon(":/adsdemo/images/custom-menu-button.svg"))
-    menu_action = options_menu.menuAction()
-    # The object name of the action will be set for the QToolButton that
-    # is created in the dock area title bar. You can use this name for CSS
-    # styling
-    menu_action.setObjectName("options_menu")
-    dock_widget.setTitleBarActions([options_menu.menuAction()])
-    a = options_menu.addAction("Clear Editor")
-    a.triggered.connect(widget.clear)
-
-    return dock_widget
 
 class CMinSizeTableWidget(QTableWidget):
     """Custom QTableWidget with a minimum size hint to test CDockWidget
@@ -162,43 +78,6 @@ class CMinSizeTableWidget(QTableWidget):
     def minimumSizeHint(self) -> QSize:
         return QSize(300, 100)
 
-def create_table_widget(view_menu: QMenu) -> QtAds.CDockWidget: 
-    widget = CMinSizeTableWidget()
-    dock_widget = QtAds.CDockWidget("Table {}".format(_State.table_count))
-    _State.table_count += 1
-    COLCOUNT = 5
-    ROWCOUNT = 30
-    widget.setColumnCount(COLCOUNT)
-    widget.setRowCount(ROWCOUNT)
-    for col in range(ROWCOUNT):
-        widget.setHorizontalHeaderItem(col, QTableWidgetItem("Col {}".format(col+1)))
-        for row in range(ROWCOUNT):
-            widget.setItem(row, col, QTableWidgetItem("T {:}-{:}".format(row+1, col+1)))
-    
-    dock_widget.setWidget(widget)
-    dock_widget.setIcon(svg_icon(":/adsdemo/images/grid_on.svg"))
-    dock_widget.setMinimumSizeHintMode(QtAds.CDockWidget.MinimumSizeHintFromContent)
-    toolbar = dock_widget.createDefaultToolBar()
-    action = toolbar.addAction(svg_icon(":/adsdemo/images/fullscreen.svg"), "Toggle Fullscreen")
-    def on_toggle_fullscreen():
-        if dock_widget.isFullScreen():
-            dock_widget.showNormal()
-        else:
-            dock_widget.showFullScreen()
-    action.triggered.connect(on_toggle_fullscreen)
-    view_menu.addAction(dock_widget.toggleViewAction())
-    return dock_widget
-    
-    
-if ACTIVEX_AVAILABLE:
-    def create_activex_widget(view_menu: QMenu, parent: QWidget = None) -> QtAds.CDockWidget: 
-        widget = QAxWidget("{6bf52a52-394a-11d3-b153-00c04f79faa6}", parent)
-        dock_widget = QtAds.CDockWidget("Active X {}".format(_State.activex_count))
-        _State.activex_count += 1
-        dock_widget.setWidget(widget)
-        view_menu.addAction(dock_widget.toggleViewAction())
-        return dock_widget
-    
     
 class CCustomComponentsFactory(QtAds.CDockComponentsFactory):
 
@@ -225,6 +104,8 @@ class MainWindow(MainWindowUI, MainWindowBase):
         self.perspective_list_action = None
         self.perspective_combo_box = None
         self.dock_manager = None
+        self.window_title_test_dock_widget = None
+        self.last_docked_editor = None
 
         self.setupUi(self)
         self.create_actions()
@@ -235,37 +116,45 @@ class MainWindow(MainWindowUI, MainWindowBase):
         
         # uncomment the following line if you want to use opaque undocking and
         # opaque splitter resizing
-        #QtAds.CDockManager.setConfigFlags(QtAds.CDockManager.DefaultOpaqueConfig);
+        #QtAds.CDockManager.setConfigFlags(QtAds.CDockManager.DefaultOpaqueConfig)
         
         # uncomment the following line if you want a fixed tab width that does
         # not change if the visibility of the close button changes
         #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.RetainTabSizeWhenCloseButtonHidden, True)
 
         # uncomment the following line if you don't want close button on DockArea's title bar
-        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.DockAreaHasCloseButton, false);
+        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.DockAreaHasCloseButton, False)
 
         # uncomment the following line if you don't want undock button on DockArea's title bar
-        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.DockAreaHasUndockButton, false);
+        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.DockAreaHasUndockButton, False)
 
         # uncomment the following line if you don't want tabs menu button on DockArea's title bar
-        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.DockAreaHasTabsMenuButton, false);
+        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.DockAreaHasTabsMenuButton, False)
 
         # uncomment the following line if you don't want disabled buttons to appear on DockArea's title bar
-        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.DockAreaHideDisabledButtons, true);
+        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.DockAreaHideDisabledButtons, True)
 
         # uncomment the following line if you want to show tabs menu button on DockArea's title bar only when there are more than one tab and at least of them has elided title
-        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.DockAreaDynamicTabsMenuButtonVisibility, true);
+        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.DockAreaDynamicTabsMenuButtonVisibility, True)
 
         # uncomment the following line if you want floating container to always show application title instead of active dock widget's title
-        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.FloatingContainerHasWidgetTitle, false);
+        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.FloatingContainerHasWidgetTitle, False)
 
         # uncomment the following line if you want floating container to show active dock widget's icon instead of always showing application icon
-        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.FloatingContainerHasWidgetIcon, true);
+        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.FloatingContainerHasWidgetIcon, True)
 
         # uncomment the following line if you want a central widget in the main dock container (the dock manager) without a titlebar
         # If you enable this code, you can test it in the demo with the Calendar 0
         # dock widget.
-        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.HideSingleCentralWidgetTitleBar, true);
+        #QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.HideSingleCentralWidgetTitleBar, True)
+        
+        # uncomment the following line to enable focus highlighting of the dock
+        # widget that has the focus
+        QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.FocusHighlighting, True)
+        
+        # uncomment if you would like to enable an equal distribution of the
+        # available size of a splitter to all contained dock widgets
+        # QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.EqualSplitOnInsertion, True)
 
         # Now create the dock manager and its content
         self.dock_manager = QtAds.CDockManager(self)
@@ -288,8 +177,7 @@ class MainWindow(MainWindowUI, MainWindowBase):
 
     def create_content(self):
         # Test container docking
-        view_menu = self.menuView
-        dock_widget = create_calendar_dock_widget(view_menu)
+        dock_widget = self.create_calendar_dock_widget()
         dock_widget.setFeature(QtAds.CDockWidget.DockWidgetClosable, False)
         special_dock_area = self.dock_manager.addDockWidget(QtAds.LeftDockWidgetArea, dock_widget)
         
@@ -297,8 +185,11 @@ class MainWindow(MainWindowUI, MainWindowBase):
         special_dock_area.setAllowedAreas(QtAds.OuterDockAreas)
         # special_dock_area.setAllowedAreas(QtAds.LeftDockWidgetArea | QtAds.RightDockWidgetArea) # just for testing
         
-        self.dock_manager.addDockWidget(QtAds.LeftDockWidgetArea, create_long_text_label_dock_widget(view_menu))
-        file_system_widget = create_file_system_tree_dock_widget(view_menu)
+        dock_widget = self.create_long_text_label_dock_widget()
+        self.window_title_test_dock_widget = dock_widget
+        dock_widget.setFeature(QtAds.CDockWidget.DockWidgetFocusable, False)
+        self.dock_manager.addDockWidget(QtAds.LeftDockWidgetArea, dock_widget)
+        file_system_widget = self.create_file_system_tree_dock_widget()
         tool_bar = file_system_widget.createDefaultToolBar()
         tool_bar.addAction(self.actionSaveState)
         tool_bar.addAction(self.actionRestoreState)
@@ -306,10 +197,7 @@ class MainWindow(MainWindowUI, MainWindowBase):
         append_feature_string_to_window_title(file_system_widget)
         self.dock_manager.addDockWidget(QtAds.BottomDockWidgetArea, file_system_widget)
         
-        file_system_widget = create_file_system_tree_dock_widget(view_menu)
-        tool_bar = file_system_widget.createDefaultToolBar()
-        tool_bar.addAction(self.actionSaveState)
-        tool_bar.addAction(self.actionRestoreState)
+        file_system_widget = self.create_file_system_tree_dock_widget()
         file_system_widget.setFeature(QtAds.CDockWidget.DockWidgetMovable, False)
         file_system_widget.setFeature(QtAds.CDockWidget.DockWidgetFloatable, False)
         append_feature_string_to_window_title(file_system_widget)
@@ -317,11 +205,14 @@ class MainWindow(MainWindowUI, MainWindowBase):
         # Test custom factory - we inject a help button into the title bar
         QtAds.CDockComponentsFactory.setFactory(CCustomComponentsFactory())
         top_dock_area = self.dock_manager.addDockWidget(QtAds.TopDockWidgetArea, file_system_widget)
+        # Uncomment the next line if you would like to test the
+        # HideSingleWidgetTitleBar functionality
+        # top_dock_area.setDockAreaFlag(QtAds.CDockAreaWidget.HideSingleWidgetTitleBar, True)
         QtAds.CDockComponentsFactory.resetDefaultFactory()
 
         # We create a calendar widget and clear all flags to prevent the dock area
         # from closing
-        dock_widget = create_calendar_dock_widget(view_menu)
+        dock_widget = self.create_calendar_dock_widget()
         dock_widget.setTabToolTip("Tab ToolTip\nHodie est dies magna")
         dock_area = self.dock_manager.addDockWidget(QtAds.CenterDockWidgetArea, dock_widget, top_dock_area)
 
@@ -336,7 +227,7 @@ class MainWindow(MainWindowUI, MainWindowBase):
         index = title_bar.indexOf(title_bar.tabBar())
         title_bar.insertWidget(index + 1, custom_button)
         def on_button_clicked():
-            dock_widget = create_editor_widget(self.menuView)
+            dock_widget = self.create_editor_widget()
             dock_widget.setFeature(QtAds.CDockWidget.DockWidgetDeleteOnClose, True)
             self.dock_manager.addDockWidgetTabToArea(dock_widget, dock_area)
             dock_widget.closeRequested.connect(self.on_editor_close_requested)
@@ -345,21 +236,21 @@ class MainWindow(MainWindowUI, MainWindowBase):
         # Test dock area docking
         right_dock_area = self.dock_manager.addDockWidget(
             QtAds.RightDockWidgetArea,
-            create_long_text_label_dock_widget(view_menu), top_dock_area)
+            self.create_long_text_label_dock_widget(), top_dock_area)
         self.dock_manager.addDockWidget(
             QtAds.TopDockWidgetArea,
-            create_long_text_label_dock_widget(view_menu), right_dock_area)
+            self.create_long_text_label_dock_widget(), right_dock_area)
     
         bottom_dock_area = self.dock_manager.addDockWidget(
             QtAds.BottomDockWidgetArea,
-            create_long_text_label_dock_widget(view_menu), right_dock_area)
+            self.create_long_text_label_dock_widget(), right_dock_area)
 
         self.dock_manager.addDockWidget(
             QtAds.CenterDockWidgetArea,
-            create_long_text_label_dock_widget(view_menu), right_dock_area)
+            self.create_long_text_label_dock_widget(), right_dock_area)
         self.dock_manager.addDockWidget(
             QtAds.CenterDockWidgetArea,
-            create_long_text_label_dock_widget(view_menu), bottom_dock_area)
+            self.create_long_text_label_dock_widget(), bottom_dock_area)
 
         
         action = self.menuTests.addAction("Set {} Floating".format(dock_widget.windowTitle()))
@@ -373,7 +264,7 @@ class MainWindow(MainWindowUI, MainWindowBase):
             flags = self.dock_manager.configFlags()
             if flags & QtAds.CDockManager.OpaqueUndocking:
                 self.dock_manager.addDockWidget(QtAds.CenterDockWidgetArea,
-                    create_activex_widget(view_menu), right_dock_area)
+                                                self.create_activex_widget(), right_dock_area)
                     
         for dock_widget in self.dock_manager.dockWidgetsMap().values():
             dock_widget.viewToggled.connect(self.on_view_toggled)
@@ -425,6 +316,7 @@ class MainWindow(MainWindowUI, MainWindowBase):
         
     def closeEvent(self, event: QCloseEvent):
         self.save_state()
+        self.dock_manager.deleteLater()
         super().closeEvent(event)
         
     def on_actionSaveState_triggered(self, state: bool):
@@ -460,21 +352,27 @@ class MainWindow(MainWindowUI, MainWindowBase):
         if dock_widget is None:
             return
 
-        qDebug("{} visibility_changed({})".format(dock_widget.objectName(), visible))
+        # qDebug("{} visibility_changed({})".format(dock_widget.objectName(), visible))
             
     def create_editor(self):
         sender = self.sender()
         floating = sender.property("Floating")
-        print("Floating:", floating)
-        dock_widget = create_editor_widget(self.menuView)
+        dock_widget = self.create_editor_widget()
         dock_widget.setFeature(QtAds.CDockWidget.DockWidgetDeleteOnClose, True)
+        dock_widget.setFeature(QtAds.CDockWidget.DockWidgetForceCloseWithArea, True)
         dock_widget.closeRequested.connect(self.on_editor_close_requested)
         
         if floating:
             floating_widget = self.dock_manager.addDockWidgetFloating(dock_widget)
             floating_widget.move(QPoint(20, 20))
         else:
-            self.dock_manager.addDockWidget(QtAds.TopDockWidgetArea, dock_widget)
+            editor_area = self.last_docked_editor.dockAreaWidget() if self.last_docked_editor is not None else None
+            if editor_area is not None:
+                self.dock_manager.setConfigFlag(QtAds.CDockManager.EqualSplitOnInsertion, True)
+                self.dock_manager.addDockWidget(QtAds.RightDockWidgetArea, dock_widget, editor_area)
+            else:
+                self.dock_manager.addDockWidget(QtAds.TopDockWidgetArea, dock_widget)
+            self.last_docked_editor = dock_widget
             
     def on_editor_close_requested(self):
         dock_widget = self.sender()
@@ -484,7 +382,7 @@ class MainWindow(MainWindowUI, MainWindowBase):
             dock_widget.closeDockWidget()
             
     def create_table(self):
-        dock_widget = create_table_widget(self.menuView)
+        dock_widget = self.create_table_widget()
         dock_widget.setFeature(QtAds.CDockWidget.DockWidgetDeleteOnClose, True)
         floating_widget = self.dock_manager.addDockWidgetFloating(dock_widget)
         floating_widget.move(QPoint(40, 40))
@@ -493,6 +391,16 @@ class MainWindow(MainWindowUI, MainWindowBase):
         dialog = CStatusDialog(self.dock_manager)
         dialog.exec_()
 
+
+    def toggle_dock_widget_window_title(self):
+        title = self.window_title_test_dock_widget.windowTitle()
+        i = title.find(" (Test) ")
+        if i == -1:
+            title += " (Test) "
+        else:
+            title = title[i]
+        self.window_title_test_dock_widget.setWindowTitle(title)
+
     def save_state(self):
         '''
         Saves the dock manager state and the main window geometry
@@ -545,6 +453,124 @@ class MainWindow(MainWindowUI, MainWindowBase):
             self.perspective_combo_box.setCurrentText(perspective_name)
             self.save_perspectives()
 
+    def create_long_text_label_dock_widget(self) -> QtAds.CDockWidget:
+        label = QLabel()
+        label.setWordWrap(True)
+        label.setAlignment(Qt.AlignTop | Qt.AlignLeft)
+        label.setText('''Label {} {} - Lorem ipsum dolor sit amet, consectetuer
+    adipiscing elit.  Aenean commodo ligula eget dolor. Aenean massa. Cum
+    sociis natoque penatibus et magnis dis parturient montes, nascetur
+    ridiculus mus.  Donec quam felis, ultricies nec, pellentesque eu, pretium
+    quis, sem.  Nulla consequat massa quis enim. Donec pede justo, fringilla
+    vel, aliquet nec, vulputate eget, arcu. In enim justo, rhoncus ut,
+    imperdiet a, venenatis vitae, justo. Nullam dictum felis eu pede mollis
+    pretium. Integer tincidunt. Cras dapibus. Vivamus elementum semper nisi.
+    Aenean vulputate eleifend tellus. Aenean leo ligula, porttitor eu,
+    consequat vitae, eleifend ac, enim. Aliquam lorem ante, dapibus in, viverra
+    quis, feugiat a, tellus. Phasellus viverra nulla ut metus varius laoreet.
+        '''.format(_State.label_count, datetime.datetime.now().strftime("%H:%M:%S:%f")))
+        dock_widget = QtAds.CDockWidget("Label {}".format(_State.label_count))
+        _State.label_count += 1
+        dock_widget.setWidget(label)
+
+        self.menuView.addAction(dock_widget.toggleViewAction())
+        return dock_widget
+
+    def create_calendar_dock_widget(self) -> QtAds.CDockWidget:
+        widget = QCalendarWidget()
+
+        dock_widget = QtAds.CDockWidget("Calendar {}".format(_State.calendar_count))
+        _State.calendar_count += 1
+        # The following lines are for testing the setWidget() and takeWidget()
+        # functionality
+        dock_widget.setWidget(widget)
+        dock_widget.setWidget(widget)  # what happens if we set a widget if a widget is already set
+        dock_widget.takeWidget()  # we remove the widget
+        dock_widget.setWidget(widget)  # and set the widget again - there should be no error
+        dock_widget.setToggleViewActionMode(QtAds.CDockWidget.ActionModeShow)
+        dock_widget.setIcon(svg_icon(":/adsdemo/images/date_range.svg"))
+        self.menuView.addAction(dock_widget.toggleViewAction())
+        return dock_widget
+
+    def create_file_system_tree_dock_widget(self) -> QtAds.CDockWidget:
+        widget = QTreeView()
+        widget.setFrameShape(QFrame.NoFrame)
+
+        m = QFileSystemModel(widget)
+        m.setRootPath(QDir.currentPath())
+        widget.setModel(m)
+
+        dock_widget = QtAds.CDockWidget("Filesystem {}".format(_State.file_system_count))
+        _State.file_system_count += 1
+        dock_widget.setWidget(widget)
+        self.menuView.addAction(dock_widget.toggleViewAction())
+        return dock_widget
+
+    def create_editor_widget(self) -> QtAds.CDockWidget:
+        widget = QPlainTextEdit()
+        widget.setPlaceholderText("This is an editor. If you close the editor, it will be "
+                                  "deleted. Enter your text here.")
+        widget.setStyleSheet("border: none")
+        dock_widget = QtAds.CDockWidget("Editor {}".format(_State.editor_count))
+        _State.editor_count += 1
+        dock_widget.setWidget(widget)
+        dock_widget.setIcon(svg_icon(":/adsdemo/images/edit.svg"))
+        dock_widget.setFeature(QtAds.CDockWidget.CustomCloseHandling, True)
+        self.menuView.addAction(dock_widget.toggleViewAction())
+
+        options_menu = QMenu(dock_widget)
+        options_menu.setTitle("Options")
+        options_menu.setToolTip(options_menu.title())
+        options_menu.setIcon(svg_icon(":/adsdemo/images/custom-menu-button.svg"))
+        menu_action = options_menu.menuAction()
+        # The object name of the action will be set for the QToolButton that
+        # is created in the dock area title bar. You can use this name for CSS
+        # styling
+        menu_action.setObjectName("options_menu")
+        dock_widget.setTitleBarActions([options_menu.menuAction()])
+        a = options_menu.addAction("Clear Editor")
+        a.triggered.connect(widget.clear)
+
+        return dock_widget
+
+
+    def create_table_widget(self) -> QtAds.CDockWidget:
+        widget = CMinSizeTableWidget()
+        dock_widget = QtAds.CDockWidget("Table {}".format(_State.table_count))
+        _State.table_count += 1
+        COLCOUNT = 5
+        ROWCOUNT = 30
+        widget.setColumnCount(COLCOUNT)
+        widget.setRowCount(ROWCOUNT)
+        for col in range(ROWCOUNT):
+            widget.setHorizontalHeaderItem(col, QTableWidgetItem("Col {}".format(col + 1)))
+            for row in range(ROWCOUNT):
+                widget.setItem(row, col, QTableWidgetItem("T {:}-{:}".format(row + 1, col + 1)))
+
+        dock_widget.setWidget(widget)
+        dock_widget.setIcon(svg_icon(":/adsdemo/images/grid_on.svg"))
+        dock_widget.setMinimumSizeHintMode(QtAds.CDockWidget.MinimumSizeHintFromContent)
+        toolbar = dock_widget.createDefaultToolBar()
+        action = toolbar.addAction(svg_icon(":/adsdemo/images/fullscreen.svg"), "Toggle Fullscreen")
+
+        def on_toggle_fullscreen():
+            if dock_widget.isFullScreen():
+                dock_widget.showNormal()
+            else:
+                dock_widget.showFullScreen()
+
+        action.triggered.connect(on_toggle_fullscreen)
+        self.menuView.addAction(dock_widget.toggleViewAction())
+        return dock_widget
+
+    def create_activex_widget(self, parent: QWidget = None) -> QtAds.CDockWidget:
+        widget = QAxWidget("{6bf52a52-394a-11d3-b153-00c04f79faa6}", parent)
+        dock_widget = QtAds.CDockWidget("Active X {}".format(_State.activex_count))
+        _State.activex_count += 1
+        dock_widget.setWidget(widget)
+        self.menuView.addAction(dock_widget.toggleViewAction())
+        return dock_widget
+
 
 def my_message_output(type, context, msg):
     if type == QtDebugMsg:

demo/main.cpp

@@ -35,9 +35,11 @@ void myMessageOutput(QtMsgType type, const QMessageLogContext &context, const QS
 
 int main(int argc, char *argv[])
 {
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 	QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
 #if QT_VERSION >= 0x050600
     QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+#endif
 #endif
 	std::shared_ptr<int> b;
 	QApplication a(argc, argv);

doc/user-guide.md

@@ -23,13 +23,20 @@
   - [`FloatingContainerHasWidgetTitle`](#floatingcontainerhaswidgettitle)
   - [`FloatingContainerHasWidgetIcon`](#floatingcontainerhaswidgeticon)
   - [`HideSingleCentralWidgetTitleBar`](#hidesinglecentralwidgettitlebar)
+  - [`FocusHighlighting`](#focushighlighting)
+  - [`EqualSplitOnInsertion`](#equalsplitoninsertion)
+  - [`FloatingContainerForceNativeTitleBar` (Linux only)](#floatingcontainerforcenativetitlebar-linux-only)
+  - [`FloatingContainerForceQWidgetTitleBar` (Linux only)](#floatingcontainerforceqwidgettitlebar-linux-only)
+- [Central Widget](#central-widget)
+- [Empty Dock Area](#empty-dock-area)
+- [Custom Close Handling](#custom-close-handling)
 - [Styling](#styling)
   - [Disabling the Internal Style Sheet](#disabling-the-internal-style-sheet)
 
 ## Configuration Flags
 
 The Advanced Docking System has a number of global configuration options to
-configure the design and the functionality of the docking system. Each
+configure the design and the functionality of the docking system. Eachs
 configuration will be explained in detail in the following sections.
 
 ### Setting Configuration Flags
@@ -284,7 +291,8 @@ otherwise (default setting) it displays application icon.
 
 ### `HideSingleCentralWidgetTitleBar`
 
-If there is only one single visible dock widget in the main dock container (the dock manager) and if this flag is set, then the titlebar of this dock widget will be hidden.
+If there is only one single visible dock widget in the main dock container (the dock manager)
+and if this flag is set, then the titlebar of this dock widget will be hidden.
 This only makes sense for non draggable and non floatable dock widgets and enables
 the creation of some kind of "central" static widget. Because the titlebar is
 hidden, it is not possible to drag out the central widget to make it floating
@@ -299,6 +307,233 @@ still has a titlebar to drag it out of the main window.
 
 ![HideSingleCentralWidgetTitleBar false](cfg_flag_HideSingleCentralWidgetTitleBar_false.png)
 
+### `FocusHighlighting`
+
+If this is enabled, the docking system is able to highlight the tab and the
+components of a dock area with a different style (i.e. a different color).
+This option is disabled by default and needs to be enabled explicitely
+because it adds some overhead. The dock manager needs to react on focus
+changes and dock widget dragging to highlight the right dock widget. You should
+enable it only, if you really need it for your application.
+
+If the feature is enabled, you can also connect to the new dock manager
+signal `focusedDockWidgetChanged(CDockWidget* old, CDockWidget* now)` to
+react on focus changes and to prepare the content of the focused dock
+widget.
+
+You can click into the tab, the titlebar or the content of a dock widget
+to focus it.
+
+![FocusHighlighting](cfg_flag_FocusHighlighting.gif)
+
+For the focused dock widget and dock widget tab, the property `focused` will
+be set to true and you can use this property to style the focused dock
+widget differently. The picture above uses the following styling:
+
+```css
+/* Color the tab with the nhighlight color */
+ads--CDockWidgetTab[focused="true"]
+{
+    background: palette(highlight);
+    border-color: palette(highlight);
+}
+
+/* Use a different colored close button icon to match the test color */
+ads--CDockWidgetTab[focused="true"] > #tabCloseButton
+{
+	qproperty-icon: url(:/ads/images/close-button-focused.svg)
+}
+
+/* Make a hovered focused close button a little bit lighter */
+ads--CDockWidgetTab[focused="true"] > #tabCloseButton:hover
+{
+	background: rgba(255, 255, 255, 48);
+}
+
+/* Make a pressed focused close button even more lighter */
+ads--CDockWidgetTab[focused="true"] > #tabCloseButton:pressed
+{
+	background: rgba(255, 255, 255, 92);
+}
+
+/* Use a different color for the tab label */
+ads--CDockWidgetTab[focused="true"] QLabel
+{
+    color: palette(light);
+}
+
+/* Paint a nice solid line for the whole title bar to create the illusion
+   of an active tab */
+ads--CDockAreaWidget[focused="true"] ads--CDockAreaTitleBar
+{
+	background: transparent;
+	border-bottom: 2px solid palette(highlight);
+	padding-bottom: 0px;
+}
+```
+
+If you have a content widget that does not support focussing for some reason
+(like `QVTKOpenGLStereoWidget` from the [VTK library](https://github.com/Kitware/VTK)),
+then you can manually switch the focus by reacting on mouse events. The 
+following code shows, how to install en event filter on the `QVTKOpenGLStereoWidget`
+to properly switch the focus on `QEvent::MouseButtonPress`:
+
+```c++
+static ads::CDockWidget* createVTK2DWindow(QMenu* ViewMenu, QObject* EventFilter)
+{
+    QVTKOpenGLStereoWidget* qvtkOpenGLStereoWidget = new QVTKOpenGLStereoWidget;
+    ads::CDockWidget* DockWidget = new ads::CDockWidget("2D Window");
+    DockWidget->setWidget(qvtkOpenGLStereoWidget);
+    qvtkOpenGLStereoWidget->installEventFilter(EventFilter);
+    qvtkOpenGLStereoWidget->setProperty("DockWidget", QVariant::fromValue(DockWidget));
+    return DockWidget;
+}
+```
+
+Now we can use the event filter function to react on mouse events and then
+use the dock manager function `setDockWidgetFocused()` to switch the focus:
+
+```c++
+bool CMainWindow::eventFilter(QObject *watched, QEvent *event)
+{
+    if (event->type() == QEvent::MouseButtonPress)
+    {
+        QVTKOpenGLStereoWidget* vtkWidget =  qobject_cast<QVTKOpenGLStereoWidget*>(watched);
+        auto vDockWidget = vtkWidget->property("DockWidget");
+        ads::CDockWidget* DockWidget = nullptr;
+        if (vDockWidget.isValid())
+        {
+            DockWidget = qvariant_cast<ads::CDockWidget*>(vDockWidget);
+        }
+
+        if (DockWidget)
+        {
+            d->DockManager->setDockWidgetFocused(DockWidget);
+        }
+    }
+    return false;
+}
+```
+
+### `EqualSplitOnInsertion`
+
+This flag configures how the space is distributed if a new dock widget is
+inserted into an existing dock area. The flag is disabled by default. If 3 
+dock widgets are inserted with the following code
+
+```c++
+d->DockManager->addDockWidget(ads::RightDockWidgetArea, DockWidget, EditorArea);
+```
+
+then this is the result, if the flag is disabled:
+
+![EqualSplitOnInsertion false](cfg_flag_EqualSplitOnInsertion_false.png)
+
+If the flag is enabled, then the space is equally distributed to all widgets 
+in a  splitter:
+
+![EqualSplitOnInsertion true](cfg_flag_EqualSplitOnInsertion_true.png)
+
+
+### `FloatingContainerForceNativeTitleBar` (Linux only)
+
+Since release 3.6 the library supports native title bars and window decorations
+for floating widgets on Linux (thanks to a user contribution).
+Native title bars and window decorations are supported by most Linux window
+managers, such as Compiz or Xfwm. Some window managers like KWin do not properly
+support this feature. Native floating widgets look better because of the native
+styling and the support all window manager features like snapping to window
+borders or maximizing. The library tries to detect the window manager during
+runtime and activates native window decorations if possible:
+
+![FloatingContainerForceNativeTitleBar true](cfg_flag_FloatingContainerForceNativeTitleBar_true.png)
+
+If you would like to overwrite this autodetection, then you can  activate this
+flag to force native window titlebars. You can overwrite autodetection and this
+flag, if you set the environment variable `ADS_UseNativeTitle` to 0 or 1.
+
+### `FloatingContainerForceQWidgetTitleBar` (Linux only)
+
+If your window manager (i.e. KWin) does not properly support native floating
+windows, the docking library falls back to QWidget based floating widget
+title bars.
+
+![FloatingContainerForceNativeTitleBar false](cfg_flag_FloatingContainerForceNativeTitleBar_false.png)
+
+If you would like to overwrite autodetection, then you can activate this flag
+to force QWidget based title bars. You can overwrite autodetection and this
+flag, if you set the environment variable `ADS_UseNativeTitle` to 0 or 1.
+
+## Central Widget
+
+The Advanced Docking System has been developed to overcome the limitations of
+the native Qt docking system with its central widget concept. This was the
+reason that until version 3.6 of the library, there was no support for such
+thing like a central widget. Thanks to the contribution of a user the library
+now supports a central widget.
+
+In the Advanced Docking System a central widget is a docking widget that is
+neither closable nor movable or floatable. A central widget has no title bar
+and so it is not possible for the user to hide, close or drag the central
+widget. If there is a central widget, then also the distribution of the sizes
+for the dock widgets around the central widget is different:
+
+- **no central widget (default)** - on resizing the available space is
+distributed to all dock widgets - the size of all dock widgets
+shrinks or grows
+- **with central widget** - on resizing only the central widget is resized - the
+dock widgets around the central widget keep their size (see the animation below)
+
+![Central Widget](central_widget.gif)
+
+To set a central widget, you just need to pass your central dock widget
+to the dock manager `setCentralWidget` function:
+
+```c++
+auto* CentralDockArea = DockManager->setCentralWidget(CentralDockWidget);
+```
+
+See the `centralwidget` example to learn how it works.
+
+> ##### Note
+> The central widget needs to be the first dock widget that is added to the
+> dock manager. The function does not work and returns a `nullptr` if there
+> are already other dock widgets registered. So `setCentralWidget` should be
+> the first function that you call when adding dock widgets.
+
+## Empty Dock Area
+
+Some applications require a fixed DockArea that is always visible, even if it
+does not contain any DockWidgets. I.e. the DockArea is in this case a kind
+of central widget that is always visible (see this
+[issue](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/issues/199)).
+
+Since version 3.7.1 the advanced docking system supports this feature. The
+`emptydockarea` example shows how this can be implemented with the library. You
+just need to create a dock widget and set the feature flag `CDockWidget::NoTab`.
+This permanently hides the tab widget of this area and removes it from the tab
+menu. For this special dock widget you should also disable all other features
+(movable, closable and floatable) to prevent closing and moving of this widget.
+If you use the `CDockManager::setCentralWidget` function like in the example
+code below, then you don't need to disable these features because this is done
+in the `setCentralWidget` function.
+
+```c++
+QLabel* label = new QLabel();
+label->setText("This is a DockArea which is always visible, even if it does not contain any DockWidgets.");
+label->setAlignment(Qt::AlignCenter);
+CDockWidget* CentralDockWidget = new CDockWidget("CentralWidget");
+CentralDockWidget->setWidget(label);
+CentralDockWidget->setFeature(ads::CDockWidget::NoTab, true);// set the flag before adding the widget to dock manager
+auto* CentralDockArea = DockManager->setCentralWidget(CentralDockWidget);
+```
+
+## Custom Close Handling
+
+Normally clicking the close button of a dock widget will just hide the widget and the user can show it again using the `toggleView()` action of the dock widget. This is meant for user interfaces with a static amount of widgets. But the advanced docking system also supports dynamic dock widgets that will get deleted on close. If you set the dock widget flag `DockWidgetDeleteOnClose` for a certain dock widget, then it will be deleted as soon as you close this dock widget. This enables the implementation of user interfaces with dynamically created editors, like in word processing applications or source code development tools.
+
+When an entire area is closed, the default behavior is to hide the dock widgets it contains regardless of the `DockWidgetDeleteOnClose` flag except if there is only one dock widget. In this special case, the `DockWidgetDeleteOnClose` flag is followed. This behavior can be changed by setting the `DockWidgetForceCloseWithArea` flag to all the dock widgets that needs to be closed with their area.
+
 ## Styling
 
 The Advanced Docking System supports styling via [Qt Style Sheets](https://doc.qt.io/qt-5/stylesheet.html). All components like splitters, tabs, buttons, titlebar and

examples/CMakeLists.txt

@@ -2,4 +2,6 @@ cmake_minimum_required(VERSION 3.5)
 project(QtADSExamples LANGUAGES CXX VERSION ${VERSION_SHORT})
 add_subdirectory(simple)
 add_subdirectory(sidebar)
-add_subdirectory(deleteonclose)
+add_subdirectory(deleteonclose)
+add_subdirectory(centralwidget)
+add_subdirectory(emptydockarea)

examples/centralwidget/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.5)
+project(ads_example_centralwidget VERSION ${VERSION_SHORT}) 
+find_package(Qt5 5.5 COMPONENTS Core Gui Widgets REQUIRED)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+add_executable(CentralWidgetExample WIN32 
+    main.cpp
+    mainwindow.cpp
+    mainwindow.ui
+)
+target_include_directories(CentralWidgetExample PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/../../src")
+target_link_libraries(CentralWidgetExample PRIVATE qtadvanceddocking)
+target_link_libraries(CentralWidgetExample PUBLIC Qt5::Core Qt5::Gui Qt5::Widgets)
+set_target_properties(CentralWidgetExample PROPERTIES 
+    AUTOMOC ON
+    AUTORCC ON
+    AUTOUIC ON
+    CXX_STANDARD 14
+    CXX_STANDARD_REQUIRED ON
+    CXX_EXTENSIONS OFF
+    VERSION ${VERSION_SHORT}
+    EXPORT_NAME "Qt Advanced Docking System Central Widget Example"
+    ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${ads_PlatformDir}/lib"
+    LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${ads_PlatformDir}/lib"
+    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${ads_PlatformDir}/bin"
+)

examples/centralwidget/centralWidget.py

@@ -0,0 +1,120 @@
+import os
+import sys
+
+from PyQt5 import uic
+from PyQt5.QtCore import Qt, QTimer, QDir, QSignalBlocker
+from PyQt5.QtGui import QCloseEvent, QIcon
+from PyQt5.QtWidgets import (QApplication, QLabel, QCalendarWidget, QFrame, QTreeView,
+                             QTableWidget, QFileSystemModel, QPlainTextEdit, QToolBar,
+                             QWidgetAction, QComboBox, QAction, QSizePolicy, QInputDialog)
+
+from PyQtAds import QtAds
+
+UI_FILE = os.path.join(os.path.dirname(__file__), 'mainwindow.ui')
+MainWindowUI, MainWindowBase = uic.loadUiType(UI_FILE)
+
+import demo_rc # pyrcc5 demo\demo.qrc -o examples\centralWidget\demo_rc.py
+
+
+def svg_icon(filename: str):
+    '''Helper function to create an SVG icon'''
+    # This is a workaround, because because in item views SVG icons are not
+    # properly scaled and look blurry or pixelate
+    icon = QIcon(filename)
+    icon.addPixmap(icon.pixmap(92))
+    return icon
+    
+
+class MainWindow(MainWindowUI, MainWindowBase):
+
+    def __init__(self, parent=None):
+        super().__init__(parent)
+
+        self.setupUi(self)
+ 
+        QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.OpaqueSplitterResize, True)
+        QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.XmlCompressionEnabled, False)
+        QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.FocusHighlighting, True)
+        self.dock_manager = QtAds.CDockManager(self)
+        
+        # Set central widget
+        text_edit = QPlainTextEdit()
+        text_edit.setPlaceholderText("This is the central editor. Enter your text here.")
+        central_dock_widget = QtAds.CDockWidget("CentralWidget")
+        central_dock_widget.setWidget(text_edit)
+        central_dock_area = self.dock_manager.setCentralWidget(central_dock_widget)
+        central_dock_area.setAllowedAreas(QtAds.DockWidgetArea.OuterDockAreas)
+        
+        # create other dock widgets
+        file_tree = QTreeView()
+        file_tree.setFrameShape(QFrame.NoFrame)
+        file_model = QFileSystemModel(file_tree)
+        file_model.setRootPath(QDir.currentPath())
+        file_tree.setModel(file_model)
+        data_dock_widget = QtAds.CDockWidget("File system")
+        data_dock_widget.setWidget(file_tree)
+        data_dock_widget.resize(150, 250)
+        data_dock_widget.setMinimumSize(100, 250)
+        file_area = self.dock_manager.addDockWidget(QtAds.DockWidgetArea.LeftDockWidgetArea, data_dock_widget, central_dock_area)
+        self.menuView.addAction(data_dock_widget.toggleViewAction())
+
+        table = QTableWidget()
+        table.setColumnCount(3)
+        table.setRowCount(10)
+        table_dock_widget = QtAds.CDockWidget("Table")
+        table_dock_widget.setWidget(table)
+        table_dock_widget.setMinimumSizeHintMode(QtAds.CDockWidget.MinimumSizeHintFromDockWidget)
+        table_dock_widget.resize(250, 150)
+        table_dock_widget.setMinimumSize(200, 150)
+        self.dock_manager.addDockWidget(QtAds.DockWidgetArea.BottomDockWidgetArea, table_dock_widget, file_area)
+        self.menuView.addAction(table_dock_widget.toggleViewAction())
+
+        properties_table = QTableWidget()
+        properties_table.setColumnCount(3)
+        properties_table.setRowCount(10)
+        properties_dock_widget = QtAds.CDockWidget("Properties")
+        properties_dock_widget.setWidget(properties_table)
+        properties_dock_widget.setMinimumSizeHintMode(QtAds.CDockWidget.MinimumSizeHintFromDockWidget)
+        properties_dock_widget.resize(250, 150)
+        properties_dock_widget.setMinimumSize(200,150)
+        self.dock_manager.addDockWidget(QtAds.DockWidgetArea.RightDockWidgetArea, properties_dock_widget, central_dock_area)
+        self.menuView.addAction(properties_dock_widget.toggleViewAction())
+        
+        self.create_perspective_ui()
+        
+    def create_perspective_ui(self):
+        save_perspective_action = QAction("Create Perspective", self)
+        save_perspective_action.setIcon(svg_icon(":/adsdemo/images/picture_in_picture.svg"))
+        save_perspective_action.triggered.connect(self.save_perspective)
+        perspective_list_action = QWidgetAction(self)
+        self.perspective_combobox = QComboBox(self)
+        self.perspective_combobox.setSizeAdjustPolicy(QComboBox.AdjustToContents)
+        self.perspective_combobox.setSizePolicy(QSizePolicy.Preferred, QSizePolicy.Preferred)
+        self.perspective_combobox.activated[str].connect(self.dock_manager.openPerspective)
+        perspective_list_action.setDefaultWidget(self.perspective_combobox)
+        self.toolBar.addSeparator()
+        self.toolBar.addAction(perspective_list_action)
+        self.toolBar.addAction(save_perspective_action)
+        
+    def save_perspective(self):
+        perspective_name, ok = QInputDialog.getText(self, "Save Perspective", "Enter Unique name:")
+        if not ok or not perspective_name:
+            return
+        
+        self.dock_manager.addPerspective(perspective_name)
+        blocker = QSignalBlocker(self.perspective_combobox)
+        self.perspective_combobox.clear()
+        self.perspective_combobox.addItems(self.dock_manager.perspectiveNames())
+        self.perspective_combobox.setCurrentText(perspective_name)
+        
+    def closeEvent(self, event: QCloseEvent):
+        self.dock_manager.deleteLater()
+        super().closeEvent(event)
+
+
+if __name__ == '__main__':
+    app = QApplication(sys.argv)
+    
+    w = MainWindow()
+    w.show()
+    app.exec_()

examples/centralwidget/centralwidget.pro

@@ -0,0 +1,34 @@
+ADS_OUT_ROOT = $${OUT_PWD}/../..
+
+QT       += core gui widgets
+
+TARGET = CentralWidgetExample
+DESTDIR = $${ADS_OUT_ROOT}/lib
+TEMPLATE = app
+CONFIG += c++14
+CONFIG += debug_and_release
+adsBuildStatic {
+    DEFINES += ADS_STATIC
+}
+
+# The following define makes your compiler emit warnings if you use
+# any Qt feature that has been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+SOURCES += \
+    main.cpp \
+    mainwindow.cpp
+
+HEADERS += \
+    mainwindow.h
+
+FORMS += \
+    mainwindow.ui
+
+LIBS += -L$${ADS_OUT_ROOT}/lib
+include(../../ads.pri)
+INCLUDEPATH += ../../src
+DEPENDPATH += ../../src
+

examples/centralwidget/main.cpp

@@ -0,0 +1,10 @@
+#include <mainwindow.h>
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    CMainWindow w;
+    w.show();
+    return a.exec();
+}

examples/centralwidget/mainwindow.cpp

@@ -0,0 +1,133 @@
+#include "mainwindow.h"
+
+#include "ui_mainwindow.h"
+
+#include <QWidgetAction>
+#include <QLabel>
+#include <QCalendarWidget>
+#include <QTreeView>
+#include <QFileSystemModel>
+#include <QTableWidget>
+#include <QHBoxLayout>
+#include <QRadioButton>
+#include <QPushButton>
+#include <QInputDialog>
+#include <QFileDialog>
+#include <QSettings>
+#include <QMessageBox>
+#include <QPlainTextEdit>
+#include <QToolBar>
+
+#include "DockAreaWidget.h"
+#include "DockAreaTitleBar.h"
+#include "DockAreaTabBar.h"
+#include "FloatingDockContainer.h"
+#include "DockComponentsFactory.h"
+
+using namespace ads;
+
+
+CMainWindow::CMainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , ui(new Ui::CMainWindow)
+{
+    ui->setupUi(this);
+    CDockManager::setConfigFlag(CDockManager::OpaqueSplitterResize, true);
+    CDockManager::setConfigFlag(CDockManager::XmlCompressionEnabled, false);
+    CDockManager::setConfigFlag(CDockManager::FocusHighlighting, true);
+    DockManager = new CDockManager(this);
+
+    // Set central widget
+    QPlainTextEdit* w = new QPlainTextEdit();
+	w->setPlaceholderText("This is the central editor. Enter your text here.");
+    CDockWidget* CentralDockWidget = new CDockWidget("CentralWidget");
+    CentralDockWidget->setWidget(w);
+    auto* CentralDockArea = DockManager->setCentralWidget(CentralDockWidget);
+    CentralDockArea->setAllowedAreas(DockWidgetArea::OuterDockAreas);
+
+    // create other dock widgets
+    QTableWidget* table = new QTableWidget();
+    table->setColumnCount(3);
+    table->setRowCount(10);
+    CDockWidget* TableDockWidget = new CDockWidget("Table 1");
+    TableDockWidget->setWidget(table);
+    TableDockWidget->setMinimumSizeHintMode(CDockWidget::MinimumSizeHintFromDockWidget);
+    TableDockWidget->resize(250, 150);
+    TableDockWidget->setMinimumSize(200,150);
+    auto TableArea = DockManager->addDockWidget(DockWidgetArea::LeftDockWidgetArea, TableDockWidget);
+    ui->menuView->addAction(TableDockWidget->toggleViewAction());
+
+    table = new QTableWidget();
+    table->setColumnCount(5);
+    table->setRowCount(1020);
+    TableDockWidget = new CDockWidget("Table 2");
+    TableDockWidget->setWidget(table);
+    TableDockWidget->setMinimumSizeHintMode(CDockWidget::MinimumSizeHintFromDockWidget);
+    TableDockWidget->resize(250, 150);
+    TableDockWidget->setMinimumSize(200,150);
+    DockManager->addDockWidget(DockWidgetArea::BottomDockWidgetArea, TableDockWidget, TableArea);
+    ui->menuView->addAction(TableDockWidget->toggleViewAction());
+
+    QTableWidget* propertiesTable = new QTableWidget();
+    propertiesTable->setColumnCount(3);
+    propertiesTable->setRowCount(10);
+    CDockWidget* PropertiesDockWidget = new CDockWidget("Properties");
+    PropertiesDockWidget->setWidget(propertiesTable);
+    PropertiesDockWidget->setMinimumSizeHintMode(CDockWidget::MinimumSizeHintFromDockWidget);
+    PropertiesDockWidget->resize(250, 150);
+    PropertiesDockWidget->setMinimumSize(200,150);
+    DockManager->addDockWidget(DockWidgetArea::RightDockWidgetArea, PropertiesDockWidget, CentralDockArea);
+    ui->menuView->addAction(PropertiesDockWidget->toggleViewAction());
+
+    createPerspectiveUi();
+}
+
+CMainWindow::~CMainWindow()
+{
+    delete ui;
+}
+
+
+void CMainWindow::createPerspectiveUi()
+{
+	SavePerspectiveAction = new QAction("Create Perspective", this);
+	connect(SavePerspectiveAction, SIGNAL(triggered()), SLOT(savePerspective()));
+	PerspectiveListAction = new QWidgetAction(this);
+	PerspectiveComboBox = new QComboBox(this);
+	PerspectiveComboBox->setSizeAdjustPolicy(QComboBox::AdjustToContents);
+	PerspectiveComboBox->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
+	connect(PerspectiveComboBox, SIGNAL(activated(const QString&)),
+		DockManager, SLOT(openPerspective(const QString&)));
+	PerspectiveListAction->setDefaultWidget(PerspectiveComboBox);
+	ui->toolBar->addSeparator();
+	ui->toolBar->addAction(PerspectiveListAction);
+	ui->toolBar->addAction(SavePerspectiveAction);
+}
+
+
+void CMainWindow::savePerspective()
+{
+	QString PerspectiveName = QInputDialog::getText(this, "Save Perspective", "Enter unique name:");
+	if (PerspectiveName.isEmpty())
+	{
+		return;
+	}
+
+	DockManager->addPerspective(PerspectiveName);
+	QSignalBlocker Blocker(PerspectiveComboBox);
+	PerspectiveComboBox->clear();
+	PerspectiveComboBox->addItems(DockManager->perspectiveNames());
+	PerspectiveComboBox->setCurrentText(PerspectiveName);
+}
+
+
+//============================================================================
+void CMainWindow::closeEvent(QCloseEvent* event)
+{
+    // Delete dock manager here to delete all floating widgets. This ensures
+    // that all top level windows of the dock manager are properly closed
+    DockManager->deleteLater();
+	QMainWindow::closeEvent(event);
+}
+
+

examples/centralwidget/mainwindow.h

@@ -0,0 +1,43 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QComboBox>
+#include <QWidgetAction>
+
+#include "DockManager.h"
+#include "DockAreaWidget.h"
+#include "DockWidget.h"
+
+QT_BEGIN_NAMESPACE
+namespace Ui { class CMainWindow; }
+QT_END_NAMESPACE
+
+class CMainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    CMainWindow(QWidget *parent = nullptr);
+    ~CMainWindow();
+
+protected:
+	virtual void closeEvent(QCloseEvent* event) override;
+
+private:
+	QAction* SavePerspectiveAction = nullptr;
+	QWidgetAction* PerspectiveListAction = nullptr;
+	QComboBox* PerspectiveComboBox = nullptr;
+
+    Ui::CMainWindow *ui;
+
+    ads::CDockManager* DockManager;
+    ads::CDockAreaWidget* StatusDockArea;
+    ads::CDockWidget* TimelineDockWidget;
+
+    void createPerspectiveUi();
+
+private slots:
+	void savePerspective();
+};
+#endif // MAINWINDOW_H

examples/centralwidget/mainwindow.ui

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>CMainWindow</class>
+ <widget class="QMainWindow" name="CMainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>1284</width>
+    <height>757</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralwidget"/>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>1284</width>
+     <height>21</height>
+    </rect>
+   </property>
+   <widget class="QMenu" name="menuView">
+    <property name="title">
+     <string>View</string>
+    </property>
+   </widget>
+   <addaction name="menuView"/>
+  </widget>
+  <widget class="QToolBar" name="toolBar">
+   <property name="windowTitle">
+    <string>toolBar</string>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>TopToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+  </widget>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

examples/deleteonclose/deleteonclose.pro

@@ -17,23 +17,7 @@ SOURCES += main.cpp
 
 
 LIBS += -L$${ADS_OUT_ROOT}/lib
-
-# Dependency: AdvancedDockingSystem (shared)
-CONFIG(debug, debug|release){
-    win32 {
-        LIBS += -lqtadvanceddockingd
-    }
-    else:mac {
-        LIBS += -lqtadvanceddocking_debug
-    }
-    else {
-        LIBS += -lqtadvanceddocking
-    }
-}
-else{
-    LIBS += -lqtadvanceddocking
-}
-
+include(../../ads.pri)
 INCLUDEPATH += ../../src
 DEPENDPATH += ../../src    
 

examples/deleteonclose/deleteonclose.py

@@ -0,0 +1,73 @@
+import sys
+
+from PyQtAds import QtAds
+from PyQt5.QtGui import QCloseEvent
+from PyQt5.QtCore import (qDebug, pyqtSlot, QObject, pyqtSignal)
+from PyQt5.QtWidgets import (QMainWindow, QAction, QTextEdit, QApplication,
+                             QMenuBar)
+
+
+class MainWindow(QMainWindow):
+    dock_manager = None
+    
+    def closeEvent(self, event: QCloseEvent):
+        super().closeEvent(event)
+        if self.dock_manager is not None:
+            self.dock_manager.deleteLater()
+    
+    def setDockManager(self, dock_manager: QtAds.CDockManager):
+        self.dock_manager = dock_manager
+        
+
+if __name__ == '__main__':
+    app = QApplication(sys.argv)
+    w = MainWindow()
+    
+    QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.FocusHighlighting, True)
+    QtAds.CDockManager.setConfigFlag(QtAds.CDockManager.AllTabsHaveCloseButton, True)
+    dock_manager = QtAds.CDockManager(w)
+    w.setDockManager(dock_manager)
+    
+    count = 0
+    
+    def on_focused_dock_widget_changed(old: QtAds.CDockWidget, now: QtAds.CDockWidget):
+        global count
+        qDebug( "{:d} CDockManager::focusedDockWidgetChanged old: {} now: {} visible: {}".format(
+            count,
+            old.objectName() if old else "-",
+            now.objectName(),
+            now.isVisible()))
+        count += 1
+        now.widget().setFocus()
+        
+    dock_manager.focusedDockWidgetChanged.connect(on_focused_dock_widget_changed)
+    
+    action = QAction("New Delete On Close", w)
+    w.menuBar().addAction(action)
+    
+    i = 0
+    def on_action_triggered():
+        global i
+        dw = QtAds.CDockWidget("test doc {:d}".format(i))
+        i += 1
+        editor = QTextEdit("lorem ipsum...", dw)
+        dw.setWidget(editor)
+        dw.setFeature(QtAds.CDockWidget.DockWidgetDeleteOnClose, True)
+        area = dock_manager.addDockWidgetTab(QtAds.CenterDockWidgetArea, dw)
+        qDebug("doc dock widget created! {} {}".format(dw, area))
+    action.triggered.connect(on_action_triggered)
+    
+    action = QAction("New", w)
+    w.menuBar().addAction(action)
+    def on_action2_triggered():
+        global i
+        dw = QtAds.CDockWidget("test {:d}".format(i))
+        i += 1
+        editor = QTextEdit("lorem ipsum...", dw)
+        dw.setWidget(editor)
+        area = dock_manager.addDockWidgetTab(QtAds.CenterDockWidgetArea, dw)
+        qDebug("dock widget created! {} {}".format(dw, area))
+    action.triggered.connect(on_action2_triggered)
+    
+    w.show()
+    app.exec_()

examples/deleteonclose/main.cpp

@@ -5,12 +5,41 @@
 #include <QMenuBar>
 #include "DockManager.h"
 
+
+class MainWindow : public QMainWindow
+{
+private:
+    ads::CDockManager* m_DockManager = nullptr;
+
+protected:
+    virtual void closeEvent(QCloseEvent *event) override
+    {
+        QMainWindow::closeEvent(event);
+        if (m_DockManager)
+        {
+            m_DockManager->deleteLater();
+        }
+    }
+
+public:
+    void setDockManager(ads::CDockManager* DockManager) {m_DockManager = DockManager;}
+};
+
+
 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
-    QMainWindow w;
+    MainWindow w;
 
+    ads::CDockManager::setConfigFlag(ads::CDockManager::FocusHighlighting, true);
+    ads::CDockManager::setConfigFlag(ads::CDockManager::AllTabsHaveCloseButton, true);
     auto dockManager = new ads::CDockManager(&w);
+    w.setDockManager(dockManager);
+    QObject::connect(dockManager, &ads::CDockManager::focusedDockWidgetChanged, [] (ads::CDockWidget* old, ads::CDockWidget* now) {
+        static int Count = 0;
+    	qDebug() << Count++ << " CDockManager::focusedDockWidgetChanged old: " << (old ? old->objectName() : "-") << " now: " << now->objectName() << " visible: " << now->isVisible();
+        now->widget()->setFocus();
+    });
 
     QAction *action = new QAction("New Delete On Close", &w);
     w.menuBar()->addAction(action);

examples/emptydockarea/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.5)
+project(ads_example_centralwidget VERSION ${VERSION_SHORT}) 
+find_package(Qt5 5.5 COMPONENTS Core Gui Widgets REQUIRED)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+add_executable(EmptyDockAreaExample WIN32 
+    main.cpp
+    mainwindow.cpp
+    mainwindow.ui
+)
+target_include_directories(EmptyDockAreaExample PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/../../src")
+target_link_libraries(EmptyDockAreaExample PRIVATE qtadvanceddocking)
+target_link_libraries(EmptyDockAreaExample PUBLIC Qt5::Core Qt5::Gui Qt5::Widgets)
+set_target_properties(EmptyDockAreaExample PROPERTIES 
+    AUTOMOC ON
+    AUTORCC ON
+    AUTOUIC ON
+    CXX_STANDARD 14
+    CXX_STANDARD_REQUIRED ON
+    CXX_EXTENSIONS OFF
+    VERSION ${VERSION_SHORT}
+    EXPORT_NAME "Qt Advanced Docking System Empty Dock Area Example"
+    ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${ads_PlatformDir}/lib"
+    LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${ads_PlatformDir}/lib"
+    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${ads_PlatformDir}/bin"
+)

examples/emptydockarea/emptydockarea.pro

@@ -0,0 +1,34 @@
+ADS_OUT_ROOT = $${OUT_PWD}/../..
+
+QT       += core gui widgets
+
+TARGET = EmptyDockareaExample
+DESTDIR = $${ADS_OUT_ROOT}/lib
+TEMPLATE = app
+CONFIG += c++14
+CONFIG += debug_and_release
+adsBuildStatic {
+    DEFINES += ADS_STATIC
+}
+
+# The following define makes your compiler emit warnings if you use
+# any Qt feature that has been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+SOURCES += \
+    main.cpp \
+    mainwindow.cpp
+
+HEADERS += \
+    mainwindow.h
+
+FORMS += \
+    mainwindow.ui
+
+LIBS += -L$${ADS_OUT_ROOT}/lib
+include(../../ads.pri)
+INCLUDEPATH += ../../src
+DEPENDPATH += ../../src
+

examples/emptydockarea/main.cpp

@@ -0,0 +1,10 @@
+#include <mainwindow.h>
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    CMainWindow w;
+    w.show();
+    return a.exec();
+}

examples/emptydockarea/mainwindow.cpp

@@ -0,0 +1,136 @@
+#include "mainwindow.h"
+
+#include "ui_mainwindow.h"
+
+#include <QWidgetAction>
+#include <QLabel>
+#include <QCalendarWidget>
+#include <QTreeView>
+#include <QFileSystemModel>
+#include <QTableWidget>
+#include <QHBoxLayout>
+#include <QRadioButton>
+#include <QPushButton>
+#include <QInputDialog>
+#include <QFileDialog>
+#include <QSettings>
+#include <QMessageBox>
+#include <QPlainTextEdit>
+#include <QToolBar>
+
+#include "DockAreaWidget.h"
+#include "DockAreaTitleBar.h"
+#include "DockAreaTabBar.h"
+#include "FloatingDockContainer.h"
+#include "DockComponentsFactory.h"
+
+using namespace ads;
+
+
+CMainWindow::CMainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , ui(new Ui::CMainWindow)
+{
+    ui->setupUi(this);
+    CDockManager::setConfigFlag(CDockManager::OpaqueSplitterResize, true);
+    CDockManager::setConfigFlag(CDockManager::XmlCompressionEnabled, false);
+    CDockManager::setConfigFlag(CDockManager::FocusHighlighting, true);
+    DockManager = new CDockManager(this);
+
+    // Set central widget
+    QLabel* label = new QLabel();
+    label->setText("This is a DockArea which is always visible, even if it does not contain any DockWidgets.");
+    label->setAlignment(Qt::AlignCenter);
+    CDockWidget* CentralDockWidget = new CDockWidget("CentralWidget");
+    CentralDockWidget->setWidget(label);
+    CentralDockWidget->setFeature(ads::CDockWidget::NoTab, true);
+    auto* CentralDockArea = DockManager->setCentralWidget(CentralDockWidget);
+
+    // create other dock widgets
+    QTableWidget* table = new QTableWidget();
+    table->setColumnCount(3);
+    table->setRowCount(10);
+    CDockWidget* TableDockWidget = new CDockWidget("Table 1");
+    TableDockWidget->setWidget(table);
+    TableDockWidget->setMinimumSizeHintMode(CDockWidget::MinimumSizeHintFromDockWidget);
+    TableDockWidget->resize(250, 150);
+    TableDockWidget->setMinimumSize(200,150);
+    DockManager->addDockWidgetTabToArea(TableDockWidget, CentralDockArea);
+    //auto TableArea = DockManager->addDockWidget(DockWidgetArea::LeftDockWidgetArea, TableDockWidget);
+    ui->menuView->addAction(TableDockWidget->toggleViewAction());
+
+    table = new QTableWidget();
+    table->setColumnCount(5);
+    table->setRowCount(1020);
+    TableDockWidget = new CDockWidget("Table 2");
+    TableDockWidget->setWidget(table);
+    TableDockWidget->setMinimumSizeHintMode(CDockWidget::MinimumSizeHintFromDockWidget);
+    TableDockWidget->resize(250, 150);
+    TableDockWidget->setMinimumSize(200,150);
+    auto TableArea = DockManager->addDockWidget(DockWidgetArea::LeftDockWidgetArea, TableDockWidget);
+    //DockManager->addDockWidget(DockWidgetArea::BottomDockWidgetArea, TableDockWidget, TableArea);
+    ui->menuView->addAction(TableDockWidget->toggleViewAction());
+
+    QTableWidget* propertiesTable = new QTableWidget();
+    propertiesTable->setColumnCount(3);
+    propertiesTable->setRowCount(10);
+    CDockWidget* PropertiesDockWidget = new CDockWidget("Properties");
+    PropertiesDockWidget->setWidget(propertiesTable);
+    PropertiesDockWidget->setMinimumSizeHintMode(CDockWidget::MinimumSizeHintFromDockWidget);
+    PropertiesDockWidget->resize(250, 150);
+    PropertiesDockWidget->setMinimumSize(200,150);
+    DockManager->addDockWidget(DockWidgetArea::RightDockWidgetArea, PropertiesDockWidget, CentralDockArea);
+    ui->menuView->addAction(PropertiesDockWidget->toggleViewAction());
+
+    createPerspectiveUi();
+}
+
+CMainWindow::~CMainWindow()
+{
+    delete ui;
+}
+
+
+void CMainWindow::createPerspectiveUi()
+{
+	SavePerspectiveAction = new QAction("Create Perspective", this);
+	connect(SavePerspectiveAction, SIGNAL(triggered()), SLOT(savePerspective()));
+	PerspectiveListAction = new QWidgetAction(this);
+	PerspectiveComboBox = new QComboBox(this);
+	PerspectiveComboBox->setSizeAdjustPolicy(QComboBox::AdjustToContents);
+	PerspectiveComboBox->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
+	connect(PerspectiveComboBox, SIGNAL(activated(const QString&)),
+		DockManager, SLOT(openPerspective(const QString&)));
+	PerspectiveListAction->setDefaultWidget(PerspectiveComboBox);
+	ui->toolBar->addSeparator();
+	ui->toolBar->addAction(PerspectiveListAction);
+	ui->toolBar->addAction(SavePerspectiveAction);
+}
+
+
+void CMainWindow::savePerspective()
+{
+	QString PerspectiveName = QInputDialog::getText(this, "Save Perspective", "Enter unique name:");
+	if (PerspectiveName.isEmpty())
+	{
+		return;
+	}
+
+	DockManager->addPerspective(PerspectiveName);
+	QSignalBlocker Blocker(PerspectiveComboBox);
+	PerspectiveComboBox->clear();
+	PerspectiveComboBox->addItems(DockManager->perspectiveNames());
+	PerspectiveComboBox->setCurrentText(PerspectiveName);
+}
+
+
+//============================================================================
+void CMainWindow::closeEvent(QCloseEvent* event)
+{
+    // Delete dock manager here to delete all floating widgets. This ensures
+    // that all top level windows of the dock manager are properly closed
+    DockManager->deleteLater();
+	QMainWindow::closeEvent(event);
+}
+
+

examples/emptydockarea/mainwindow.h

@@ -0,0 +1,43 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QComboBox>
+#include <QWidgetAction>
+
+#include "DockManager.h"
+#include "DockAreaWidget.h"
+#include "DockWidget.h"
+
+QT_BEGIN_NAMESPACE
+namespace Ui { class CMainWindow; }
+QT_END_NAMESPACE
+
+class CMainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    CMainWindow(QWidget *parent = nullptr);
+    ~CMainWindow();
+
+protected:
+	virtual void closeEvent(QCloseEvent* event) override;
+
+private:
+	QAction* SavePerspectiveAction = nullptr;
+	QWidgetAction* PerspectiveListAction = nullptr;
+	QComboBox* PerspectiveComboBox = nullptr;
+
+    Ui::CMainWindow *ui;
+
+    ads::CDockManager* DockManager;
+    ads::CDockAreaWidget* StatusDockArea;
+    ads::CDockWidget* TimelineDockWidget;
+
+    void createPerspectiveUi();
+
+private slots:
+	void savePerspective();
+};
+#endif // MAINWINDOW_H

examples/emptydockarea/mainwindow.ui

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>CMainWindow</class>
+ <widget class="QMainWindow" name="CMainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>1284</width>
+    <height>757</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralwidget"/>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>1284</width>
+     <height>21</height>
+    </rect>
+   </property>
+   <widget class="QMenu" name="menuView">
+    <property name="title">
+     <string>View</string>
+    </property>
+   </widget>
+   <addaction name="menuView"/>
+  </widget>
+  <widget class="QToolBar" name="toolBar">
+   <property name="windowTitle">
+    <string>toolBar</string>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>TopToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+  </widget>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

examples/examples.pro

@@ -1,6 +1,8 @@
 TEMPLATE = subdirs
 
 SUBDIRS = \
+    centralwidget \
 	simple \
 	sidebar \
-	deleteonclose
+	deleteonclose \
+	emptydockarea

examples/sidebar/MainWindow.cpp

@@ -51,3 +51,13 @@ MainWindow::~MainWindow()
 {
     delete ui;
 }
+
+
+void MainWindow::closeEvent(QCloseEvent *event)
+{
+    QMainWindow::closeEvent(event);
+    if (m_DockManager)
+    {
+        m_DockManager->deleteLater();
+    }
+}

examples/sidebar/MainWindow.h

@@ -22,6 +22,9 @@ public:
     explicit MainWindow(QWidget *parent = 0);
     ~MainWindow();
 
+protected:
+    virtual void closeEvent(QCloseEvent *event) override;
+
 private:
     Ui::MainWindow *ui;
     ads::CDockManager* m_DockManager;

examples/sidebar/sidebar.pro

@@ -25,23 +25,7 @@ FORMS += \
         
 
 LIBS += -L$${ADS_OUT_ROOT}/lib
-
-# Dependency: AdvancedDockingSystem (shared)
-CONFIG(debug, debug|release){
-    win32 {
-        LIBS += -lqtadvanceddockingd
-    }
-    else:mac {
-        LIBS += -lqtadvanceddocking_debug
-    }
-    else {
-        LIBS += -lqtadvanceddocking
-    }
-}
-else{
-    LIBS += -lqtadvanceddocking
-}
-
+include(../../ads.pri)
 INCLUDEPATH += ../../src
 DEPENDPATH += ../../src    
 

examples/simple/MainWindow.cpp

@@ -3,6 +3,7 @@
 #include "ui_MainWindow.h"
 
 #include <QLabel>
+#include <QTimer>
 
 MainWindow::MainWindow(QWidget *parent) :
     QMainWindow(parent),
@@ -38,3 +39,4 @@ MainWindow::~MainWindow()
 {
     delete ui;
 }
+

examples/simple/simple.pro

@@ -25,23 +25,7 @@ FORMS += \
         
 
 LIBS += -L$${ADS_OUT_ROOT}/lib
-
-# Dependency: AdvancedDockingSystem (shared)
-CONFIG(debug, debug|release){
-    win32 {
-        LIBS += -lqtadvanceddockingd
-    }
-    else:mac {
-        LIBS += -lqtadvanceddocking_debug
-    }
-    else {
-        LIBS += -lqtadvanceddocking
-    }
-}
-else{
-    LIBS += -lqtadvanceddocking
-}
-
+include(../../ads.pri)
 INCLUDEPATH += ../../src
 DEPENDPATH += ../../src    
 

examples/simple/simple.py

@@ -2,7 +2,8 @@ import os
 import sys
 
 from PyQt5 import uic
-from PyQt5.QtCore import Qt
+from PyQt5.QtCore import Qt, QTimer
+from PyQt5.QtGui import QCloseEvent
 from PyQt5.QtWidgets import QApplication, QLabel
 
 from PyQtAds import QtAds
@@ -33,6 +34,7 @@ class MainWindow(MainWindowUI, MainWindowBase):
         # as the dock widget content
         dock_widget = QtAds.CDockWidget("Label 1")
         dock_widget.setWidget(l)
+        
 
         # Add the toggleViewAction of the dock widget to the menu to give
         # the user the possibility to show the dock widget if it has been closed

setup.py

@@ -159,8 +159,20 @@ class build_ext(sipdistutils.build_ext):
             return sip_bin
 
         raise SystemExit('Could not find PyQt SIP binary.')
+        
+    def _sip_sipfiles_dir(self):
+        sip_dir = super()._sip_sipfiles_dir()
+        if os.path.exists(sip_dir):
+            return sip_dir
+        
+        return os.path.join(sys.prefix, 'sip', 'PyQt5')
 
     def _sip_compile(self, sip_bin, source, sbf):
+        target_dir = os.path.dirname(__file__) if self.inplace else self.build_lib
+        pyi = os.path.join(target_dir, "PyQtAds", "QtAds", "ads.pyi")
+        if not os.path.exists(os.path.dirname(pyi)):
+            os.makedirs(os.path.dirname(pyi))
+        
         cmd = [sip_bin]
         if hasattr(self, 'sip_opts'):
             cmd += self.sip_opts
@@ -173,11 +185,20 @@ class build_ext(sipdistutils.build_ext):
             "-I", self.inc_dir,
             "-c", self._sip_output_dir(),
             "-b", sbf,
+            "-y", pyi,
             "-w", "-o"]
 
         cmd += shlex.split(self.pyqt_sip_flags)  # use same SIP flags as for PyQt5
         cmd.append(source)
         self.spawn(cmd)
+        
+        if os.path.exists(pyi):
+            with open(pyi) as f:
+                content = f.readlines()
+            with open(pyi, "w") as f:
+                for line in content:
+                    if not line.startswith("class ads"):
+                        f.write(line)
 
     def swig_sources (self, sources, extension=None):
         if not self.extensions:
@@ -206,14 +227,15 @@ class build_ext(sipdistutils.build_ext):
                 extension.extra_link_args += ['-F' + self.qtconfig.QT_INSTALL_LIBS,
                     '-mmacosx-version-min=10.9']
             elif sys.platform == 'linux':
-                extension.extra_compile_args += ['-std=c++11']
+                extension.extra_compile_args += ['-D', 'QT_X11EXTRAS_LIB', '-std=c++11']
+                extension.include_dirs += [os.path.join(self.qt_include_dir, 'QtX11Extras')]
+                extension.libraries += ['Qt5X11Extras' + self.qt_libinfix]
 
         return super().swig_sources(sources, extension)
 
-    def build_extension(self, ext):
-        # /usr/bin/rcc -name ads ../../Qt-Advanced-Docking-System/src/ads.qrc -o release/qrc_ads.cpp
-        
+    def build_extension(self, ext):        
         cppsources = [source for source in ext.sources if source.endswith(".cpp")]
+        headersources = ['src/DockAreaTitleBar_p.h']
 
         dir_util.mkpath(self.build_temp, dry_run=self.dry_run)
 
@@ -247,6 +269,30 @@ class build_ext(sipdistutils.build_ext):
                 if os.path.getsize(out_file) > 0:
                     ext.sources.append(out_file)
 
+        # Run moc on all orphan header files.
+        for source in headersources:
+            # *.cpp -> *.moc
+            moc_file = os.path.basename(source).replace(".h", ".moc")
+            out_file = os.path.join(self.build_temp, moc_file)
+
+            if newer(source, out_file) or self.force:
+                spawn.spawn(get_moc_args(out_file, source),
+                            dry_run=self.dry_run)
+
+            header = source
+            if os.path.exists(header):
+                # *.h -> moc_*.cpp
+                moc_file = "moc_" + os.path.basename(header).replace(
+                    ".h", ".cpp")
+                out_file = os.path.join(self.build_temp, moc_file)
+
+                if newer(header, out_file) or self.force:
+                    spawn.spawn(get_moc_args(out_file, header),
+                                dry_run=self.dry_run)
+
+                if os.path.getsize(out_file) > 0:
+                    ext.sources.append(out_file)
+
         # Add the temp build directory to include path, for compiler to find
         # the created .moc files
         ext.include_dirs += [self._sip_output_dir()]
@@ -263,6 +309,17 @@ class build_ext(sipdistutils.build_ext):
                 ext.sources.append(out_file)
 
         sipdistutils.build_ext.build_extension(self, ext)
+        
+        import inspect
+        sys.path.append(os.path.join(self.build_lib, 'PyQtAds', 'QtAds'))
+        import ads
+
+        with open(os.path.join(self.build_lib, 'PyQtAds', 'QtAds', '__init__.py'), 'w') as f:
+            f.write('from .._version import *\n')
+            f.write('from .ads import ads\n')
+            for name, member in sorted(inspect.getmembers(ads.ads)):
+                if not name.startswith('_'):
+                    f.write('{0} = ads.{0}\n'.format(name))
 
 
 class ProcessResourceCommand(cmd.Command):

sip/DockAreaTitleBar_p.sip

@@ -0,0 +1,37 @@
+%Import QtWidgets/QtWidgetsmod.sip
+
+%If (Qt_5_0_0 -)
+
+namespace ads
+{
+
+class CTitleBarButton : QToolButton
+{
+    %TypeHeaderCode
+    #include <DockAreaTitleBar_p.h>
+    %End
+
+protected:
+    bool event(QEvent *ev);
+
+public:
+    CTitleBarButton(bool visible = true, QWidget* parent /TransferThis/ = Q_NULLPTR );
+    virtual void setVisible(bool visible);
+};
+
+
+class CSpacerWidget : QWidget
+{
+    %TypeHeaderCode
+    #include <DockAreaTitleBar_p.h>
+    %End
+
+public:
+	CSpacerWidget(QWidget* Parent /TransferThis/ = 0 );
+	virtual QSize sizeHint() const;
+	virtual QSize minimumSizeHint() const;
+};
+
+};
+
+%End

sip/DockAreaWidget.sip

@@ -4,7 +4,7 @@
 
 namespace ads
 {
-    
+
 class CDockAreaWidget : QFrame
 {
 
@@ -28,10 +28,18 @@ protected slots:
 	void toggleView(bool Open);
     
 public:
+    enum eDockAreaFlag
+	{
+		HideSingleWidgetTitleBar,
+		DefaultFlags
+	};
+    typedef QFlags<ads::CDockAreaWidget::eDockAreaFlag> DockAreaFlags;
+    
 	CDockAreaWidget(ads::CDockManager* DockManager /TransferThis/, ads::CDockContainerWidget* parent /TransferThis/);
 	virtual ~CDockAreaWidget();
 	ads::CDockManager* dockManager() const;
 	ads::CDockContainerWidget* dockContainer() const;
+	virtual QSize minimumSizeHint() const;
 	QRect titleBarGeometry() const;
 	QRect contentAreaGeometry() const;
 	int dockWidgetsCount() const;
@@ -51,6 +59,12 @@ public:
 	void setAllowedAreas(DockWidgetAreas areas);
 	DockWidgetAreas allowedAreas() const;
 	CDockAreaTitleBar* titleBar() const;
+    
+    DockAreaFlags dockAreaFlags() const;
+    void setDockAreaFlags(DockAreaFlags Flags);
+    void setDockAreaFlag(eDockAreaFlag Flag, bool On);
+    
+    bool isCentralWidgetArea() const;
 
 public slots:
 	void setCurrentIndex(int index);

sip/DockContainerWidget.sip

@@ -32,6 +32,7 @@ protected:
 	ads::CDockWidget* topLevelDockWidget() const;
 	ads::CDockAreaWidget* topLevelDockArea() const;
     QList<ads::CDockWidget*> dockWidgets() const;
+    void updateSplitterHandles(QSplitter* splitter);
     
 public:
 	/**

sip/DockFocusController.sip

@@ -0,0 +1,32 @@
+%Import QtWidgets/QtWidgetsmod.sip
+
+%If (Qt_5_0_0 -)
+
+namespace ads
+{
+
+/**
+ * Manages focus styling of dock widgets and handling of focus changes
+ */
+class CDockFocusController : QObject
+{
+    %TypeHeaderCode
+    #include <DockFocusController.h>
+    %End
+    
+public:
+	CDockFocusController(ads::CDockManager* DockManager);
+	virtual ~CDockFocusController();
+
+	void notifyWidgetOrAreaRelocation(QWidget* RelocatedWidget);
+	void notifyFloatingWidgetDrop(ads::CFloatingDockContainer* FloatingWidget);
+    ads::CDockWidget* focusedDockWidget() const;
+
+public slots:
+	void setDockWidgetFocused(ads::CDockWidget* focusedNow);
+    
+}; // class DockFocusController
+};
+ // namespace ads
+ 
+%End

sip/DockManager.sip

@@ -1,7 +1,7 @@
 %Import QtWidgets/QtWidgetsmod.sip
 
 %If (Qt_5_0_0 -)
-    
+
 %MappedType QMap<QString, ads::CDockWidget*>
         /TypeHint="Dict[QString, CDockWidget*]", TypeHintValue="{}"/
 {
@@ -133,6 +133,8 @@ protected:
 	void removeDockContainer(ads::CDockContainerWidget* DockContainer /TransferBack/);
 	ads::CDockOverlay* containerOverlay() const;
 	ads::CDockOverlay* dockAreaOverlay() const;
+    void notifyWidgetOrAreaRelocation(QWidget* RelocatedWidget);
+    void notifyFloatingWidgetDrop(ads::CFloatingDockContainer* FloatingWidget);
 
     virtual void showEvent(QShowEvent *event);
 
@@ -166,6 +168,10 @@ public:
 		FloatingContainerHasWidgetTitle,
 		FloatingContainerHasWidgetIcon,
 		HideSingleCentralWidgetTitleBar,
+        FocusHighlighting,
+        EqualSplitOnInsertion,
+        FloatingContainerForceNativeTitleBar,
+        FloatingContainerForceQWidgetTitleBar,
         DefaultDockAreaButtons,
 		DefaultBaseConfig,
         DefaultOpaqueConfig,
@@ -194,23 +200,29 @@ public:
 	const QList<ads::CDockContainerWidget*> dockContainers() const;
 	const QList<ads::CFloatingDockContainer*> floatingWidgets() const;
 	unsigned int zOrderIndex() const;
-	QByteArray saveState(int version = 1) const;
-	bool restoreState(const QByteArray &state, int version = 1);
+	QByteArray saveState(int version = 0) const;
+	bool restoreState(const QByteArray &state, int version = 0);
 	void addPerspective(const QString& UniquePrespectiveName);
 	void removePerspective(const QString& Name);
 	void removePerspectives(const QStringList& Names);
 	QStringList perspectiveNames() const;
 	void savePerspectives(QSettings& Settings) const;
 	void loadPerspectives(QSettings& Settings);
+    CDockWidget* centralWidget() const;
+    CDockAreaWidget* setCentralWidget(CDockWidget* widget /Transfer/);
 	QAction* addToggleViewActionToMenu(QAction* ToggleViewAction /Transfer/,
 		const QString& Group = QString(), const QIcon& GroupIcon = QIcon());
 	QMenu* viewMenu() const;
 	void setViewMenuInsertionOrder(ads::CDockManager::eViewMenuInsertionOrder Order);
 	bool isRestoringState() const;
 	static int startDragDistance();
+    ads::CDockWidget* focusedDockWidget() const;
+    QList<int> splitterSizes(ads::CDockAreaWidget *ContainedArea) const;
+    void setSplitterSizes(ads::CDockAreaWidget *ContainedArea, const QList<int>& sizes);
 
 public slots:
 	void openPerspective(const QString& PerspectiveName);
+    void setDockWidgetFocused(ads::CDockWidget* DockWidget);
 
 signals:
 	void perspectiveListChanged();
@@ -219,10 +231,12 @@ signals:
     void stateRestored();
     void openingPerspective(const QString& PerspectiveName);
     void perspectiveOpened(const QString& PerspectiveName);
-	void floatingWidgetCreated(CFloatingDockContainer* FloatingWidget);
-    void dockAreaCreated(ads::CDockAreaWidget* DockArea);
-    void dockWidgetAboutToBeRemoved(ads::CDockWidget* DockWidget);
-    void dockWidgetRemoved(ads::CDockWidget* DockWidget);
+	void floatingWidgetCreated(ads::CFloatingDockContainer*);
+    void dockAreaCreated(ads::CDockAreaWidget*);
+    void dockWidgetAdded(ads::CDockWidget* DockWidget);
+    void dockWidgetAboutToBeRemoved(ads::CDockWidget*);
+    void dockWidgetRemoved(ads::CDockWidget*);
+    void focusedDockWidgetChanged(ads::CDockWidget*, ads::CDockWidget*);
 };
 
 };

sip/DockSplitter.sip

@@ -18,6 +18,7 @@ public:
 	bool hasVisibleContent() const;
 	QWidget* firstWidget() const;
 	QWidget* lastWidget() const;
+    bool isResizingWithContainer() const;
 
 };
 

sip/DockWidget.sip

@@ -31,6 +31,8 @@ public:
 		DockWidgetFloatable,
 		DockWidgetDeleteOnClose,
         CustomCloseHandling,
+        DockWidgetFocusable,
+        DockWidgetForceCloseWithArea,
         DefaultDockWidgetFeatures,
         AllDockWidgetFeatures,
 		NoDockWidgetFeatures
@@ -83,6 +85,7 @@ public:
 	QAction* toggleViewAction() const;
 	void setToggleViewActionMode(ads::CDockWidget::eToggleViewActionMode Mode);
 	void setMinimumSizeHintMode(ads::CDockWidget::eMinimumSizeHintMode Mode);
+    bool isCentralWidget() const;
 	void setIcon(const QIcon& Icon);
 	QIcon icon() const;
 	QToolBar* toolBar() const;

sip/DockWidgetTab.sip

@@ -34,6 +34,9 @@ public:
 	bool isClosable() const;
 	virtual bool event(QEvent *e);
 	void setElideMode(Qt::TextElideMode mode);
+    void updateStyle();
+    QSize iconSize() const;
+    void setIconSize(const QSize& Size);
 
 public slots:
 	virtual void setVisible(bool visible);

sip/FloatingDockContainer.sip

@@ -27,6 +27,7 @@ public:
 
 	virtual void moveFloating() = 0;
 	virtual void finishDragging() = 0;
+	virtual ~IFloatingWidget();
 };
 
 
@@ -51,11 +52,24 @@ protected:
 
 protected:
 	virtual void changeEvent(QEvent *event);
-	virtual void moveEvent(QMoveEvent *event);
-	virtual bool event(QEvent *e);
 	virtual void closeEvent(QCloseEvent *event);
 	virtual void hideEvent(QHideEvent *event);
 	virtual void showEvent(QShowEvent *event);
+    
+    %If (WS_MACX)
+    virtual bool event(QEvent *e);
+	virtual void moveEvent(QMoveEvent *event);
+    %End
+    
+    %If (WS_X11)
+    virtual void moveEvent(QMoveEvent *event);
+	virtual void resizeEvent(QResizeEvent *event);
+    %End
+    
+	%If (WS_WIN)
+	virtual bool nativeEvent(const QByteArray &eventType, void *message, long *result);
+	%End
+
 
 public:
 	CFloatingDockContainer(ads::CDockManager* DockManager /TransferThis/);
@@ -67,6 +81,15 @@ public:
     bool hasTopLevelDockWidget() const;
     ads::CDockWidget* topLevelDockWidget() const;
     QList<ads::CDockWidget*> dockWidgets() const;
+    
+    %If (WS_X11)
+    void onMaximizeRequest();
+	void showNormal(bool fixGeometry);
+	void showMaximized();
+	bool isMaximized() const;
+	void show();
+	bool hasNativeTitleBar();
+    %End
 };
 
 };

sip/FloatingDragPreview.sip

@@ -13,7 +13,6 @@ class CFloatingDragPreview : QWidget, ads::IFloatingWidget
     %End
 
 protected:
-	virtual void moveEvent(QMoveEvent *event);
 	virtual void paintEvent(QPaintEvent *e);
 	CFloatingDragPreview(QWidget* Content /TransferThis/, QWidget* parent /TransferThis/);
 

sip/ads.sip

@@ -5,11 +5,13 @@
 %Include ads_globals.sip
 %Include DockWidget.sip
 %Include DockAreaTabBar.sip
+%Include DockAreaTitleBar_p.sip
 %Include DockAreaTitleBar.sip
 %Include DockAreaWidget.sip
 %Include DockComponentsFactory.sip
 %Include DockContainerWidget.sip
 %Include DockingStateReader.sip
+%Include DockFocusController.sip
 %Include DockManager.sip
 %Include DockOverlay.sip
 %Include DockSplitter.sip

sip/ads_globals.sip

@@ -8,13 +8,6 @@ namespace ads
     #include <ads_globals.h>
     %End
 
-    enum eStateFileVersion
-    {
-        InitialVersion,
-        Version1,
-        CurrentVersion
-    };
-
     enum DockWidgetArea
     {
         NoDockWidgetArea,

sip/linux/FloatingWidgetTitleBar.sip

@@ -15,15 +15,24 @@ protected:
 	virtual void mousePressEvent(QMouseEvent *ev);
 	virtual void mouseReleaseEvent(QMouseEvent *ev);
 	virtual void mouseMoveEvent(QMouseEvent *ev);
+    virtual void mouseDoubleClickEvent(QMouseEvent *event);
+    
+    void setMaximizeIcon(const QIcon& Icon);
+    QIcon maximizeIcon() const;
+    void setNormalIcon(const QIcon& Icon);
+    QIcon normalIcon() const;
 
 public:
 	explicit CFloatingWidgetTitleBar(CFloatingDockContainer *parent /TransferThis/ = 0);
 	virtual ~CFloatingWidgetTitleBar();
 	void enableCloseButton(bool Enable);
 	void setTitle(const QString &Text);
+    void updateStyle();
+    void setMaximizedIcon(bool maximized);
 
 signals:
 	void closeRequested();
+    void maximizeRequested();
 };
 
 };

src/CMakeLists.txt

@@ -1,6 +1,9 @@
 cmake_minimum_required(VERSION 3.5)
 project(QtAdvancedDockingSystem LANGUAGES CXX VERSION ${VERSION_SHORT})
 find_package(Qt5 5.5 COMPONENTS Core Gui Widgets REQUIRED)
+if (UNIX AND NOT APPLE)
+	find_package(Qt5 5.5 COMPONENTS X11Extras REQUIRED)
+endif()
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 if(BUILD_STATIC)
     set(CMAKE_STATIC_LIBRARY_SUFFIX "_static${CMAKE_STATIC_LIBRARY_SUFFIX}")
@@ -17,6 +20,7 @@ set(ads_SRCS
     DockWidget.cpp
     DockWidgetTab.cpp
     DockingStateReader.cpp
+    DockFocusController.cpp
     ElidingLabel.cpp
     FloatingDockContainer.cpp
     FloatingDragPreview.cpp
@@ -24,7 +28,7 @@ set(ads_SRCS
     DockComponentsFactory.cpp
     ads.qrc
 )
-set(ads_INSTALL_INCLUDE 
+set(ads_HEADERS
     ads_globals.h
     DockAreaTabBar.h
     DockAreaTitleBar.h
@@ -37,24 +41,30 @@ set(ads_INSTALL_INCLUDE
     DockWidget.h
     DockWidgetTab.h
     DockingStateReader.h
+    DockFocusController.h
     ElidingLabel.h
     FloatingDockContainer.h
     FloatingDragPreview.h
     IconProvider.h
     DockComponentsFactory.h
 )
-if (UNIX)
+add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/utf-8>")
+if (UNIX AND NOT APPLE)
     set(ads_SRCS linux/FloatingWidgetTitleBar.cpp ${ads_SRCS})
-    set(ads_INSTALL_INCLUDE linux/FloatingWidgetTitleBar.h ${ads_INSTALL_INCLUDE})
+    set(ads_HEADERS linux/FloatingWidgetTitleBar.h ${ads_HEADERS})
 endif()
 if(BUILD_STATIC)
-    add_library(qtadvanceddocking STATIC ${ads_SRCS})
+    add_library(qtadvanceddocking STATIC ${ads_SRCS} ${ads_HEADERS})
     target_compile_definitions(qtadvanceddocking PUBLIC ADS_STATIC)
 else()
-    add_library(qtadvanceddocking SHARED ${ads_SRCS})
+    add_library(qtadvanceddocking SHARED ${ads_SRCS} ${ads_HEADERS})
     target_compile_definitions(qtadvanceddocking PRIVATE ADS_SHARED_EXPORT)
 endif()
 target_link_libraries(qtadvanceddocking PUBLIC Qt5::Core Qt5::Gui Qt5::Widgets)
+if(UNIX AND NOT APPLE)
+    target_link_libraries(qtadvanceddocking PUBLIC Qt5::X11Extras)
+	target_link_libraries(qtadvanceddocking PRIVATE xcb)
+endif()
 set_target_properties(qtadvanceddocking PROPERTIES 
     AUTOMOC ON
     AUTORCC ON
@@ -73,7 +83,7 @@ write_basic_package_version_file(
     VERSION ${VERSION_SHORT}
     COMPATIBILITY SameMajorVersion
 )
-install(FILES ${ads_INSTALL_INCLUDE}
+install(FILES ${ads_HEADERS}
     DESTINATION include 
     COMPONENT headers
 )
@@ -102,5 +112,5 @@ install(FILES qtadvanceddockingConfig.cmake "${CMAKE_CURRENT_BINARY_DIR}/qtadvan
 
 target_include_directories(qtadvanceddocking PUBLIC
     $<INSTALL_INTERFACE:include>
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
 )
-

src/DockAreaTabBar.cpp

@@ -138,6 +138,8 @@ CDockAreaTabBar::CDockAreaTabBar(CDockAreaWidget* parent) :
 	d->TabsLayout->addStretch(1);
 	d->TabsContainerWidget->setLayout(d->TabsLayout);
 	setWidget(d->TabsContainerWidget);
+
+    setFocusPolicy(Qt::NoFocus);
 }
 
 
@@ -178,11 +180,11 @@ void CDockAreaTabBar::setCurrentIndex(int index)
 		return;
     }
 
-    emit currentChanging(index);
+    Q_EMIT currentChanging(index);
 	d->CurrentIndex = index;
 	d->updateTabs();
 	updateGeometry();
-	emit currentChanged(index);
+	Q_EMIT currentChanged(index);
 }
 
 
@@ -204,7 +206,7 @@ void CDockAreaTabBar::insertTab(int Index, CDockWidgetTab* Tab)
 	connect(Tab, SIGNAL(moved(const QPoint&)), this, SLOT(onTabWidgetMoved(const QPoint&)));
 	connect(Tab, SIGNAL(elidedChanged(bool)), this, SIGNAL(elidedChanged(bool)));
 	Tab->installEventFilter(this);
-	emit tabInserted(Index);
+	Q_EMIT tabInserted(Index);
     if (Index <= d->CurrentIndex)
 	{
 		setCurrentIndex(d->CurrentIndex + 1);
@@ -264,7 +266,7 @@ void CDockAreaTabBar::removeTab(CDockWidgetTab* Tab)
 		}
 	}
 
-	emit removingTab(RemoveIndex);
+	Q_EMIT removingTab(RemoveIndex);
 	d->TabsLayout->removeWidget(Tab);
 	Tab->disconnect(this);
 	Tab->removeEventFilter(this);
@@ -318,7 +320,7 @@ void CDockAreaTabBar::onTabClicked()
 		return;
 	}
 	setCurrentIndex(index);
- 	emit tabBarClicked(index);
+ 	Q_EMIT tabBarClicked(index);
 }
 
 
@@ -407,7 +409,7 @@ void CDockAreaTabBar::onTabWidgetMoved(const QPoint& GlobalPos)
 		d->TabsLayout->removeWidget(MovingTab);
 		d->TabsLayout->insertWidget(toIndex, MovingTab);
         ADS_PRINT("tabMoved from " << fromIndex << " to " << toIndex);
-		emit tabMoved(fromIndex, toIndex);
+		Q_EMIT tabMoved(fromIndex, toIndex);
 		setCurrentIndex(toIndex);
 	}
 	else
@@ -430,7 +432,7 @@ void CDockAreaTabBar::closeTab(int Index)
 	{
 		return;
 	}
-	emit tabCloseRequested(Index);
+	Q_EMIT tabCloseRequested(Index);
 }
 
 
@@ -447,15 +449,20 @@ bool CDockAreaTabBar::eventFilter(QObject *watched, QEvent *event)
 	switch (event->type())
 	{
 	case QEvent::Hide:
-		 emit tabClosed(d->TabsLayout->indexOf(Tab));
+		 Q_EMIT tabClosed(d->TabsLayout->indexOf(Tab));
 		 updateGeometry();
 		 break;
 
 	case QEvent::Show:
-		 emit tabOpened(d->TabsLayout->indexOf(Tab));
+		 Q_EMIT tabOpened(d->TabsLayout->indexOf(Tab));
 		 updateGeometry();
 		 break;
 
+    // Setting the text of a tab will cause a LayoutRequest event
+    case QEvent::LayoutRequest:
+         updateGeometry();
+         break;
+
 	default:
 		break;
 	}

src/DockAreaTabBar.h

@@ -58,7 +58,7 @@ private:
 	friend struct DockAreaTabBarPrivate;
 	friend class CDockAreaTitleBar;
 
-private slots:
+private Q_SLOTS:
 	void onTabClicked();
 	void onTabCloseRequested();
 	void onCloseOtherTabsRequested();
@@ -140,7 +140,7 @@ public:
 	 */
 	virtual QSize sizeHint() const override;
 
-public slots:
+public Q_SLOTS:
 	/**
 	 * This property sets the index of the tab bar's visible tab
 	 */
@@ -152,7 +152,7 @@ public slots:
 	 */
 	void closeTab(int Index);
 
-signals:
+Q_SIGNALS:
     /**
      * This signal is emitted when the tab bar's current tab is about to be changed. The new
      * current has the given index, or -1 if there isn't a new one.

src/DockAreaTitleBar.cpp

@@ -103,10 +103,11 @@ struct DockAreaTitleBarPrivate
 
 	/**
 	 * Returns true if the given config flag is set
+	 * Convenience function to ease config flag testing
 	 */
 	static bool testConfigFlag(CDockManager::eConfigFlag Flag)
 	{
-		return CDockManager::configFlags().testFlag(Flag);
+		return CDockManager::testConfigFlag(Flag);
 	}
 
 	/**
@@ -162,7 +163,7 @@ void DockAreaTitleBarPrivate::createButtons()
 
 	// Undock button
 	UndockButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasUndockButton));
-	UndockButton->setObjectName("undockButton");
+	UndockButton->setObjectName("detachGroupButton");
 	UndockButton->setAutoRaise(true);
 	internal::setToolTip(UndockButton, QObject::tr("Detach Group"));
 	internal::setButtonIcon(UndockButton, QStyle::SP_TitleBarNormalButton, ads::DockAreaUndockIcon);
@@ -172,7 +173,7 @@ void DockAreaTitleBarPrivate::createButtons()
 
 	// Close button
 	CloseButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasCloseButton));
-	CloseButton->setObjectName("closeButton");
+	CloseButton->setObjectName("dockAreaCloseButton");
 	CloseButton->setAutoRaise(true);
 	internal::setButtonIcon(CloseButton, QStyle::SP_TitleBarCloseButton, ads::DockAreaCloseIcon);
 	if (testConfigFlag(CDockManager::DockAreaCloseButtonClosesTab))
@@ -212,7 +213,7 @@ IFloatingWidget* DockAreaTitleBarPrivate::makeAreaFloating(const QPoint& Offset,
 {
 	QSize Size = DockArea->size();
 	this->DragState = DragState;
-	bool OpaqueUndocking = CDockManager::configFlags().testFlag(CDockManager::OpaqueUndocking) ||
+	bool OpaqueUndocking = CDockManager::testConfigFlag(CDockManager::OpaqueUndocking) ||
 		(DraggingFloatingWidget != DragState);
 	CFloatingDockContainer* FloatingDockContainer = nullptr;
 	IFloatingWidget* FloatingWidget;
@@ -268,6 +269,8 @@ CDockAreaTitleBar::CDockAreaTitleBar(CDockAreaWidget* parent) :
 	d->createTabBar();
 	d->Layout->addWidget(new CSpacerWidget(this));
 	d->createButtons();
+
+    setFocusPolicy(Qt::NoFocus);
 }
 
 
@@ -379,7 +382,7 @@ void CDockAreaTitleBar::onTabsMenuActionTriggered(QAction* Action)
 {
 	int Index = Action->data().toInt();
 	d->TabBar->setCurrentIndex(Index);
-	emit tabBarClicked(Index);
+	Q_EMIT tabBarClicked(Index);
 }
 
 
@@ -465,6 +468,11 @@ void CDockAreaTitleBar::mousePressEvent(QMouseEvent* ev)
 		ev->accept();
 		d->DragStartMousePos = ev->pos();
 		d->DragState = DraggingMousePressed;
+
+		if (CDockManager::testConfigFlag(CDockManager::FocusHighlighting))
+		{
+			d->TabBar->currentTab()->setFocus(Qt::OtherFocusReason);
+		}
 		return;
 	}
 	Super::mousePressEvent(ev);
@@ -485,6 +493,7 @@ void CDockAreaTitleBar::mouseReleaseEvent(QMouseEvent* ev)
 		{
 			d->FloatingWidget->finishDragging();
 		}
+
 		return;
 	}
 	Super::mouseReleaseEvent(ev);
@@ -570,12 +579,12 @@ void CDockAreaTitleBar::contextMenuEvent(QContextMenuEvent* ev)
 	}
 
 	QMenu Menu(this);
-	auto Action = Menu.addAction(tr("Detach Area"), this, SLOT(onUndockButtonClicked()));
+	auto Action = Menu.addAction(tr("Detach Group"), this, SLOT(onUndockButtonClicked()));
 	Action->setEnabled(d->DockArea->features().testFlag(CDockWidget::DockWidgetFloatable));
 	Menu.addSeparator();
-	Action = Menu.addAction(tr("Close Area"), this, SLOT(onCloseButtonClicked()));
+	Action = Menu.addAction(tr("Close Group"), this, SLOT(onCloseButtonClicked()));
 	Action->setEnabled(d->DockArea->features().testFlag(CDockWidget::DockWidgetClosable));
-	Menu.addAction(tr("Close Other Areas"), d->DockArea, SLOT(closeOtherAreas()));
+	Menu.addAction(tr("Close Other Groups"), d->DockArea, SLOT(closeOtherAreas()));
 	Menu.exec(ev->globalPos());
 }
 
@@ -594,11 +603,12 @@ int CDockAreaTitleBar::indexOf(QWidget *widget) const
 }
 
 //============================================================================
-CTitleBarButton::CTitleBarButton(bool visible /*= true*/, QWidget* parent /*= nullptr*/) : tTitleBarButton(parent),
-Visible(visible),
-HideWhenDisabled(DockAreaTitleBarPrivate::testConfigFlag(CDockManager::DockAreaHideDisabledButtons))
+CTitleBarButton::CTitleBarButton(bool visible, QWidget* parent)
+	: tTitleBarButton(parent),
+	  Visible(visible),
+	  HideWhenDisabled(CDockManager::testConfigFlag(CDockManager::DockAreaHideDisabledButtons))
 {
-
+    setFocusPolicy(Qt::NoFocus);
 }
 
 //============================================================================

src/DockAreaTitleBar.h

@@ -54,7 +54,7 @@ private:
 	DockAreaTitleBarPrivate* d; ///< private data (pimpl)
 	friend struct DockAreaTitleBarPrivate;
 
-private slots:
+private Q_SLOTS:
 	void onTabsMenuAboutToShow();
 	void onCloseButtonClicked();
 	void onUndockButtonClicked();
@@ -88,7 +88,7 @@ protected:
 	 */
 	virtual void contextMenuEvent(QContextMenuEvent *event) override;
 
-public slots:
+public Q_SLOTS:
 	/**
 	 * Call this slot to tell the title bar that it should update the tabs menu
 	 * the next time it is shown.
@@ -148,7 +148,7 @@ public:
 	 */
 	int indexOf(QWidget *widget) const;
 
-signals:
+Q_SIGNALS:
 	/**
 	 * This signal is emitted if a tab in the tab bar is clicked by the user
 	 * or if the user clicks on a tab item in the title bar tab menu.

src/DockAreaWidget.cpp

@@ -30,8 +30,6 @@
 //============================================================================
 #include "DockAreaWidget.h"
 
-#include <iostream>
-
 #include <QStackedLayout>
 #include <QScrollBar>
 #include <QScrollArea>
@@ -136,6 +134,10 @@ public:
 			m_CurrentWidget = nullptr;
 			m_CurrentIndex = -1;
 		}
+		else if (indexOf(Widget) < m_CurrentIndex)
+		{
+			--m_CurrentIndex;
+		}
 		m_Widgets.removeOne(Widget);
 	}
 
@@ -173,6 +175,7 @@ public:
 		{
 			LayoutItem->widget()->setParent(nullptr);
 		}
+		delete LayoutItem;
 
 		m_ParentLayout->addWidget(next);
 		if (prev)
@@ -233,6 +236,7 @@ public:
 
 
 using DockAreaLayout = CDockAreaLayout;
+static const DockWidgetAreas DefaultAllowedAreas = AllDockAreas;
 
 
 /**
@@ -246,8 +250,9 @@ struct DockAreaWidgetPrivate
 	CDockAreaTitleBar*	TitleBar		= nullptr;
 	CDockManager*		DockManager		= nullptr;
 	bool UpdateTitleBarButtons = false;
-	DockWidgetAreas		AllowedAreas	= AllDockAreas;
+	DockWidgetAreas		AllowedAreas	= DefaultAllowedAreas;
 	QSize MinSizeHint;
+	CDockAreaWidget::DockAreaFlags Flags{CDockAreaWidget::DefaultFlags};
 
 	/**
 	 * Private data constructor
@@ -319,7 +324,6 @@ struct DockAreaWidgetPrivate
 		}
 	}
 };
-// struct DockAreaWidgetPrivate
 
 
 //============================================================================
@@ -374,7 +378,7 @@ CDockAreaWidget::CDockAreaWidget(CDockManager* DockManager, CDockContainerWidget
 	d->ContentsLayout = new DockAreaLayout(d->Layout);
 	if (d->DockManager)
 	{
-		emit d->DockManager->dockAreaCreated(this);
+		Q_EMIT d->DockManager->dockAreaCreated(this);
 	}
 }
 
@@ -413,6 +417,7 @@ void CDockAreaWidget::insertDockWidget(int index, CDockWidget* DockWidget,
 	bool Activate)
 {
 	d->ContentsLayout->insertWidget(index, DockWidget);
+	DockWidget->setDockArea(this);
 	DockWidget->tabWidget()->setDockAreaWidget(this);
 	auto TabWidget = DockWidget->tabWidget();
 	// Inserting the tab will change the current index which in turn will
@@ -428,7 +433,6 @@ void CDockAreaWidget::insertDockWidget(int index, CDockWidget* DockWidget,
 	{
 		setCurrentIndex(index);
 	}
-	DockWidget->setDockArea(this);
 	// If this dock area is hidden, then we need to make it visible again
 	// by calling DockWidget->toggleViewInternal(true);
 	if (!this->isVisible() && d->ContentsLayout->count() > 1 && !dockManager()->isRestoringState())
@@ -436,6 +440,7 @@ void CDockAreaWidget::insertDockWidget(int index, CDockWidget* DockWidget,
 		DockWidget->toggleViewInternal(true);
 	}
 	d->updateTitleBarButtonStates();
+    updateTitleBarVisibility();
 }
 
 
@@ -443,12 +448,15 @@ void CDockAreaWidget::insertDockWidget(int index, CDockWidget* DockWidget,
 void CDockAreaWidget::removeDockWidget(CDockWidget* DockWidget)
 {
     ADS_PRINT("CDockAreaWidget::removeDockWidget");
-	auto NextOpenDockWidget = nextOpenDockWidget(DockWidget);
+    auto CurrentDockWidget = currentDockWidget();
+  	auto NextOpenDockWidget = (DockWidget == CurrentDockWidget) ? nextOpenDockWidget(DockWidget) : nullptr;
 
 	d->ContentsLayout->removeWidget(DockWidget);
 	auto TabWidget = DockWidget->tabWidget();
 	TabWidget->hide();
 	d->tabBar()->removeTab(TabWidget);
+	TabWidget->setParent(DockWidget);
+	DockWidget->setDockArea(nullptr);
 	CDockContainerWidget* DockContainer = dockContainer();
 	if (NextOpenDockWidget)
 	{
@@ -459,8 +467,16 @@ void CDockAreaWidget::removeDockWidget(CDockWidget* DockWidget)
         ADS_PRINT("Dock Area empty");
 		DockContainer->removeDockArea(this);
 		this->deleteLater();
+		if(DockContainer->dockAreaCount() == 0)
+		{
+			if(CFloatingDockContainer*  FloatingDockContainer = DockContainer->floatingWidget())
+			{
+				FloatingDockContainer->hide();
+				FloatingDockContainer->deleteLater();
+			}
+		}
 	}
-	else
+	else if (DockWidget == CurrentDockWidget)
 	{
 		// if contents layout is not empty but there are no more open dock
 		// widgets, then we need to hide the dock area because it does not
@@ -588,11 +604,11 @@ void CDockAreaWidget::setCurrentIndex(int index)
 		return;
 	}
 
-    emit currentChanging(index);
+    Q_EMIT currentChanging(index);
     TabBar->setCurrentIndex(index);
 	d->ContentsLayout->setCurrentIndex(index);
 	d->ContentsLayout->currentWidget()->show();
-	emit currentChanged(index);
+	Q_EMIT currentChanged(index);
 }
 
 
@@ -731,7 +747,7 @@ void CDockAreaWidget::updateTitleBarVisibility()
 		return;
 	}
 
-    if (CDockManager::configFlags().testFlag(CDockManager::AlwaysShowTabs))
+    if (CDockManager::testConfigFlag(CDockManager::AlwaysShowTabs))
     {
         return;
     }
@@ -739,7 +755,8 @@ void CDockAreaWidget::updateTitleBarVisibility()
 	if (d->TitleBar)
 	{
 		bool Hidden = Container->hasTopLevelDockWidget() && (Container->isFloating()
-			|| CDockManager::configFlags().testFlag(CDockManager::HideSingleCentralWidgetTitleBar));
+			|| CDockManager::testConfigFlag(CDockManager::HideSingleCentralWidgetTitleBar));
+		Hidden |= (d->Flags.testFlag(HideSingleWidgetTitleBar) && openDockWidgetsCount() == 1);
 		d->TitleBar->setVisible(!Hidden);
 	}
 }
@@ -764,6 +781,17 @@ void CDockAreaWidget::saveState(QXmlStreamWriter& s) const
 	auto CurrentDockWidget = currentDockWidget();
 	QString Name = CurrentDockWidget ? CurrentDockWidget->objectName() : "";
 	s.writeAttribute("Current", Name);
+	// To keep the saved XML data small, we only save the allowed areas and the
+	// dock area flags if the values are different from the default values
+	if (d->AllowedAreas != DefaultAllowedAreas)
+	{
+		s.writeAttribute("AllowedAreas", QString::number(d->AllowedAreas, 16));
+	}
+
+	if (d->Flags != DefaultFlags)
+	{
+		s.writeAttribute("Flags", QString::number(d->Flags, 16));
+	}
     ADS_PRINT("CDockAreaWidget::saveState TabCount: " << d->ContentsLayout->count()
             << " Current: " << Name);
 	for (int i = 0; i < d->ContentsLayout->count(); ++i)
@@ -780,18 +808,49 @@ CDockWidget* CDockAreaWidget::nextOpenDockWidget(CDockWidget* DockWidget) const
 	auto OpenDockWidgets = openedDockWidgets();
 	if (OpenDockWidgets.count() > 1 || (OpenDockWidgets.count() == 1 && OpenDockWidgets[0] != DockWidget))
 	{
-		CDockWidget* NextDockWidget;
 		if (OpenDockWidgets.last() == DockWidget)
 		{
-			NextDockWidget = OpenDockWidgets[OpenDockWidgets.count() - 2];
+			CDockWidget* NextDockWidget = OpenDockWidgets[OpenDockWidgets.count() - 2];
+			// search backwards for widget with tab
+			for (int i = OpenDockWidgets.count() - 2; i >= 0; --i)
+			{
+				auto dw = OpenDockWidgets[i];
+				if (!dw->features().testFlag(CDockWidget::NoTab))
+				{
+					return dw;
+				}
+			}
+
+			// return widget without tab
+			return NextDockWidget;
 		}
 		else
 		{
-			int NextIndex = OpenDockWidgets.indexOf(DockWidget) + 1;
-			NextDockWidget = OpenDockWidgets[NextIndex];
-		}
+			int IndexOfDockWidget = OpenDockWidgets.indexOf(DockWidget);
+			CDockWidget* NextDockWidget = OpenDockWidgets[IndexOfDockWidget + 1];
+			// search forwards for widget with tab
+			for (int i = IndexOfDockWidget + 1; i < OpenDockWidgets.count(); ++i)
+			{
+				auto dw = OpenDockWidgets[i];
+				if (!dw->features().testFlag(CDockWidget::NoTab))
+				{
+					return dw;
+				}
+			}
 
-		return NextDockWidget;
+			// search backwards for widget with tab
+			for (int i = IndexOfDockWidget - 1; i >= 0; --i)
+			{
+				auto dw = OpenDockWidgets[i];
+				if (!dw->features().testFlag(CDockWidget::NoTab))
+				{
+					return dw;
+				}
+			}
+
+			// return widget without tab
+			return NextDockWidget;
+		}
 	}
 	else
 	{
@@ -829,7 +888,7 @@ void CDockAreaWidget::toggleView(bool Open)
 {
 	setVisible(Open);
 
-	emit viewToggled(Open);
+	Q_EMIT viewToggled(Open);
 }
 
 
@@ -843,16 +902,49 @@ void CDockAreaWidget::setVisible(bool Visible)
 	}
 }
 
+
+//============================================================================
 void CDockAreaWidget::setAllowedAreas(DockWidgetAreas areas)
 {
 	d->AllowedAreas = areas;
 }
 
+
+//============================================================================
 DockWidgetAreas CDockAreaWidget::allowedAreas() const
 {
 	return d->AllowedAreas;
 }
 
+
+//============================================================================
+CDockAreaWidget::DockAreaFlags CDockAreaWidget::dockAreaFlags() const
+{
+	return d->Flags;
+}
+
+
+//============================================================================
+void CDockAreaWidget::setDockAreaFlags(DockAreaFlags Flags)
+{
+	auto ChangedFlags = d->Flags ^ Flags;
+	d->Flags = Flags;
+	if (ChangedFlags.testFlag(HideSingleWidgetTitleBar))
+	{
+		updateTitleBarVisibility();
+	}
+}
+
+
+//============================================================================
+void CDockAreaWidget::setDockAreaFlag(eDockAreaFlag Flag, bool On)
+{
+	auto flags = dockAreaFlags();
+	internal::setFlag(flags, Flag, On);
+	setDockAreaFlags(flags);
+}
+
+
 //============================================================================
 QAbstractButton* CDockAreaWidget::titleBarButton(TitleBarButton which) const
 {
@@ -866,17 +958,20 @@ void CDockAreaWidget::closeArea()
 	// If there is only one single dock widget and this widget has the
 	// DeleteOnClose feature, then we delete the dock widget now
 	auto OpenDockWidgets = openedDockWidgets();
-	if (OpenDockWidgets.count() == 1 && OpenDockWidgets[0]->features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
+    if (OpenDockWidgets.count() == 1 && OpenDockWidgets[0]->features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
 	{
 		OpenDockWidgets[0]->closeDockWidgetInternal();
 	}
-	else
+    else
 	{
-		for (auto DockWidget : openedDockWidgets())
-		{
-			DockWidget->toggleView(false);
-		}
-	}
+        for (auto DockWidget : openedDockWidgets())
+        {
+            if (DockWidget->features().testFlag(CDockWidget::DockWidgetDeleteOnClose) && DockWidget->features().testFlag(CDockWidget::DockWidgetForceCloseWithArea))
+                DockWidget->closeDockWidgetInternal();
+            else
+                DockWidget->toggleView(false);
+        }
+    }
 }
 
 
@@ -894,11 +989,47 @@ CDockAreaTitleBar* CDockAreaWidget::titleBar() const
 }
 
 
+//============================================================================
+bool CDockAreaWidget::isCentralWidgetArea() const
+{
+    if (dockWidgetsCount()!= 1)
+    {
+        return false;
+    }
+
+    return dockManager()->centralWidget() == dockWidgets()[0];
+}
+
+
 //============================================================================
 QSize CDockAreaWidget::minimumSizeHint() const
 {
-	return d->MinSizeHint.isValid() ? d->MinSizeHint : Super::minimumSizeHint();
+	if (!d->MinSizeHint.isValid())
+	{
+		return Super::minimumSizeHint();
+	}
+
+	if (d->TitleBar->isVisible())
+	{
+		return d->MinSizeHint + QSize(0, d->TitleBar->minimumSizeHint().height());
+	}
+	else
+	{
+		return d->MinSizeHint;
+	}
 }
+
+
+//============================================================================
+void CDockAreaWidget::onDockWidgetFeaturesChanged()
+{
+	if (d->TitleBar)
+	{
+		d->updateTitleBarButtonStates();
+	}
+}
+
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockAreaWidget.h

@@ -65,8 +65,9 @@ private:
 	friend class CDockWidget;
 	friend struct DockManagerPrivate;
 	friend class CDockManager;
+	void onDockWidgetFeaturesChanged();
 
-private slots:
+private Q_SLOTS:
 	void onTabCloseRequested(int Index);
 
 	/**
@@ -137,13 +138,23 @@ protected:
 	 */
 	void markTitleBarMenuOutdated();
 
-protected slots:
+protected Q_SLOTS:
 	void toggleView(bool Open);
 
 public:
 	using Super = QFrame;
 
 	/**
+	 * Dock area related flags
+	 */
+	enum eDockAreaFlag
+	{
+		HideSingleWidgetTitleBar = 0x0001,
+		DefaultFlags = 0x0000
+	};
+	Q_DECLARE_FLAGS(DockAreaFlags, eDockAreaFlag)
+
+    /**
 	 * Default Constructor
 	 */
 	CDockAreaWidget(CDockManager* DockManager, CDockContainerWidget* parent);
@@ -277,7 +288,31 @@ public:
 	 */
 	CDockAreaTitleBar* titleBar() const;
 
-public slots:
+	/**
+	 * Returns the dock area flags - a combination of flags that configure the
+	 * appearance and features of the dock area.
+	 * \see setDockAreaFlasg()
+	 */
+	DockAreaFlags dockAreaFlags() const;
+
+	/**
+	 * Sets the dock area flags - a combination of flags that configure the
+	 * appearance and features of the dock area
+	 */
+	void setDockAreaFlags(DockAreaFlags Flags);
+
+	/**
+	 * Sets the dock area flag Flag on this widget if on is true; otherwise
+	 * clears the flag.
+	 */
+	void setDockAreaFlag(eDockAreaFlag Flag, bool On);
+
+    /**
+     * Returns true if the area contains the central widget of it's manager.
+     */
+    bool isCentralWidgetArea() const;
+
+public Q_SLOTS:
 	/**
 	 * This activates the tab for the given tab index.
 	 * If the dock widget for the given tab is not visible, the this function
@@ -295,7 +330,7 @@ public slots:
 	 */
 	void closeOtherAreas();
 
-signals:
+Q_SIGNALS:
 	/**
 	 * This signal is emitted when user clicks on a tab at an index.
 	 */

src/DockContainerWidget.cpp

@@ -147,12 +147,12 @@ public:
 	 * Adds dock widget to container and returns the dock area that contains
 	 * the inserted dock widget
 	 */
-	CDockAreaWidget* dockWidgetIntoContainer(DockWidgetArea area, CDockWidget* Dockwidget);
+	CDockAreaWidget* addDockWidgetToContainer(DockWidgetArea area, CDockWidget* Dockwidget);
 
 	/**
 	 * Adds dock widget to a existing DockWidgetArea
 	 */
-	CDockAreaWidget* dockWidgetIntoDockArea(DockWidgetArea area, CDockWidget* Dockwidget,
+	CDockAreaWidget* addDockWidgetToDockArea(DockWidgetArea area, CDockWidget* Dockwidget,
 		CDockAreaWidget* TargetDockArea);
 
 	/**
@@ -284,13 +284,13 @@ public:
 	void emitDockAreasRemoved()
 	{
 		onVisibleDockAreaCountChanged();
-		emit _this->dockAreasRemoved();
+		Q_EMIT _this->dockAreasRemoved();
 	}
 
 	void emitDockAreasAdded()
 	{
 		onVisibleDockAreaCountChanged();
-		emit _this->dockAreasAdded();
+		Q_EMIT _this->dockAreasAdded();
 	}
 
 	/**
@@ -299,11 +299,41 @@ public:
 	CDockSplitter* newSplitter(Qt::Orientation orientation, QWidget* parent = nullptr)
 	{
 		CDockSplitter* s = new CDockSplitter(orientation, parent);
-		s->setOpaqueResize(CDockManager::configFlags().testFlag(CDockManager::OpaqueSplitterResize));
+		s->setOpaqueResize(CDockManager::testConfigFlag(CDockManager::OpaqueSplitterResize));
 		s->setChildrenCollapsible(false);
 		return s;
 	}
 
+	/**
+	 * Ensures equal distribution of the sizes of a splitter if an dock widget
+	 * is inserted from code
+	 */
+	void adjustSplitterSizesOnInsertion(QSplitter* Splitter, qreal LastRatio = 1.0)
+	{
+		int AreaSize = (Splitter->orientation() == Qt::Horizontal) ? Splitter->width() : Splitter->height();
+		auto SplitterSizes = Splitter->sizes();
+
+		qreal TotRatio = SplitterSizes.size() - 1.0 + LastRatio;
+		for(int i = 0; i < SplitterSizes.size() -1; i++)
+		{
+			SplitterSizes[i] = AreaSize / TotRatio;
+		}
+		SplitterSizes.back() = AreaSize * LastRatio / TotRatio;
+		Splitter->setSizes(SplitterSizes);
+	}
+
+    /**
+     * This function forces the dock container widget to update handles of splitters
+     * based if a central widget exists.
+     */
+    void updateSplitterHandles(QSplitter* splitter);
+
+    /**
+     * If no central widget exists, the widgets resize with the container.
+     * If a central widget exists, the widgets surrounding the central widget
+     * do not resize its height or width.
+     */
+    bool widgetResizesWithContainer(QWidget* widget);
 
 // private slots: ------------------------------------------------------------
 	void onDockAreaViewToggled(bool Visible)
@@ -311,7 +341,7 @@ public:
 		CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(_this->sender());
 		VisibleDockAreaCount += Visible ? 1 : -1;
 		onVisibleDockAreaCountChanged();
-		emit _this->dockAreaViewToggled(DockArea, Visible);
+		Q_EMIT _this->dockAreaViewToggled(DockArea, Visible);
 	}
 }; // struct DockContainerWidgetPrivate
 
@@ -403,7 +433,8 @@ void DockContainerWidgetPrivate::dropIntoContainer(CFloatingDockContainer* Float
 		QSplitter* NewSplitter = newSplitter(InsertParam.orientation());
 		QLayoutItem* li = Layout->replaceWidget(Splitter, NewSplitter);
 		NewSplitter->addWidget(Splitter);
-		Splitter = NewSplitter;
+        updateSplitterHandles(NewSplitter);
+        Splitter = NewSplitter;
 		delete li;
 	}
 
@@ -412,19 +443,21 @@ void DockContainerWidgetPrivate::dropIntoContainer(CFloatingDockContainer* Float
 	if (FloatingSplitter->count() == 1)
 	{
 		insertWidgetIntoSplitter(Splitter, FloatingSplitter->widget(0), InsertParam.append());
-	}
+        updateSplitterHandles(Splitter);
+    }
 	else if (FloatingSplitter->orientation() == InsertParam.orientation())
 	{
         int InsertIndex = InsertParam.append() ? Splitter->count() : 0;
 		while (FloatingSplitter->count())
 		{
             Splitter->insertWidget(InsertIndex++, FloatingSplitter->widget(0));
-		}
-	}
+            updateSplitterHandles(Splitter);
+        }
+    }
 	else
 	{
 		insertWidgetIntoSplitter(Splitter, FloatingSplitter, InsertParam.append());
-	}
+    }
 
 	RootSplitter = Splitter;
 	addDockAreasToList(NewDockAreas);
@@ -435,7 +468,7 @@ void DockContainerWidgetPrivate::dropIntoContainer(CFloatingDockContainer* Float
 	if (!Splitter->isVisible())
 	{
 		Splitter->show();
-	}
+    }
 	_this->dumpLayout();
 }
 
@@ -497,7 +530,8 @@ void DockContainerWidgetPrivate::dropIntoSection(CFloatingDockContainer* Floatin
 		QSplitter* Splitter = newSplitter(InsertParam.orientation());
 		Layout->replaceWidget(TargetArea, Splitter);
 		Splitter->addWidget(TargetArea);
-		TargetAreaSplitter = Splitter;
+        updateSplitterHandles(Splitter);
+        TargetAreaSplitter = Splitter;
 	}
 	int AreaIndex = TargetAreaSplitter->indexOf(TargetArea);
 	auto Widget = FloatingWidget->dockContainer()->findChild<QWidget*>(QString(), Qt::FindDirectChildrenOnly);
@@ -511,7 +545,8 @@ void DockContainerWidgetPrivate::dropIntoSection(CFloatingDockContainer* Floatin
 		if ((FloatingSplitter->orientation() != InsertParam.orientation()) && FloatingSplitter->count() > 1)
 		{
 			TargetAreaSplitter->insertWidget(AreaIndex + InsertParam.insertOffset(), Widget);
-		}
+            updateSplitterHandles(TargetAreaSplitter);
+        }
 		else
 		{
 			AdjustSplitterSizes = (FloatingSplitter->count() == 1);
@@ -519,8 +554,9 @@ void DockContainerWidgetPrivate::dropIntoSection(CFloatingDockContainer* Floatin
 			while (FloatingSplitter->count())
 			{
 				TargetAreaSplitter->insertWidget(InsertIndex++, FloatingSplitter->widget(0));
-			}
-		}
+                updateSplitterHandles(TargetAreaSplitter);
+            }
+        }
 
 		if (AdjustSplitterSizes)
 		{
@@ -539,28 +575,32 @@ void DockContainerWidgetPrivate::dropIntoSection(CFloatingDockContainer* Floatin
 		if ((FloatingSplitter->orientation() != InsertParam.orientation()) && FloatingSplitter->count() > 1)
 		{
 			NewSplitter->addWidget(Widget);
-		}
+            updateSplitterHandles(NewSplitter);
+        }
 		else
 		{
 			AdjustSplitterSizes = (FloatingSplitter->count() == 1);
 			while (FloatingSplitter->count())
 			{
 				NewSplitter->addWidget(FloatingSplitter->widget(0));
-			}
-		}
+                updateSplitterHandles(NewSplitter);
+            }
+        }
 
 		// Save the sizes before insertion and restore it later to prevent
 		// shrinking of existing area
 		auto Sizes = TargetAreaSplitter->sizes();
 		insertWidgetIntoSplitter(NewSplitter, TargetArea, !InsertParam.append());
-		if (AdjustSplitterSizes)
+        updateSplitterHandles(NewSplitter);
+        if (AdjustSplitterSizes)
 		{
 			int Size = TargetAreaSize / 2;
 			NewSplitter->setSizes({Size, Size});
 		}
 		TargetAreaSplitter->insertWidget(AreaIndex, NewSplitter);
 		TargetAreaSplitter->setSizes(Sizes);
-	}
+        updateSplitterHandles(TargetAreaSplitter);
+    }
 
 	addDockAreasToList(NewDockAreas);
 	_this->dumpLayout();
@@ -645,7 +685,8 @@ void DockContainerWidgetPrivate::moveToNewSection(QWidget* Widget, CDockAreaWidg
 	{
 		int TargetAreaSize = (InsertParam.orientation() == Qt::Horizontal) ? TargetArea->width() : TargetArea->height();
 		TargetAreaSplitter->insertWidget(AreaIndex + InsertParam.insertOffset(), NewDockArea);
-		int Size = (TargetAreaSize - TargetAreaSplitter->handleWidth()) / 2;
+        updateSplitterHandles(TargetAreaSplitter);
+        int Size = (TargetAreaSize - TargetAreaSplitter->handleWidth()) / 2;
 		Sizes[AreaIndex] = Size;
 		Sizes.insert(AreaIndex, Size);
 	}
@@ -656,16 +697,58 @@ void DockContainerWidgetPrivate::moveToNewSection(QWidget* Widget, CDockAreaWidg
 		QSplitter* NewSplitter = newSplitter(InsertParam.orientation());
 		NewSplitter->addWidget(TargetArea);
 		insertWidgetIntoSplitter(NewSplitter, NewDockArea, InsertParam.append());
-		int Size = TargetAreaSize / 2;
+        updateSplitterHandles(NewSplitter);
+        int Size = TargetAreaSize / 2;
 		NewSplitter->setSizes({Size, Size});
 		TargetAreaSplitter->insertWidget(AreaIndex, NewSplitter);
-	}
+        updateSplitterHandles(TargetAreaSplitter);
+    }
 	TargetAreaSplitter->setSizes(Sizes);
 
 	addDockAreasToList({NewDockArea});
 }
 
 
+//============================================================================
+void DockContainerWidgetPrivate::updateSplitterHandles( QSplitter* splitter )
+{
+	if (!DockManager->centralWidget() || !splitter)
+	{
+		return;
+	}
+
+	for (int i = 0; i < splitter->count(); ++i)
+    {
+		splitter->setStretchFactor(i, widgetResizesWithContainer(splitter->widget(i)) ? 1 : 0);
+    }
+}
+
+
+//============================================================================
+bool DockContainerWidgetPrivate::widgetResizesWithContainer(QWidget* widget)
+{
+    if (!DockManager->centralWidget())
+    {
+        return true;
+    }
+
+    auto Area = qobject_cast<CDockAreaWidget*>(widget);
+    if(Area)
+    {
+        return Area->isCentralWidgetArea();
+    }
+
+    auto innerSplitter = qobject_cast<CDockSplitter*>(widget);
+    if (innerSplitter)
+    {
+        return innerSplitter->isResizingWithContainer();
+    }
+
+    return false;
+}
+
+
+
 //============================================================================
 void DockContainerWidgetPrivate::moveToContainer(QWidget* Widget, DockWidgetArea area)
 {
@@ -834,15 +917,15 @@ bool DockContainerWidgetPrivate::restoreSplitter(CDockingStateReader& s,
 	{
 		QWidget* ChildNode = nullptr;
 		bool Result = true;
-		if (s.name() == "Splitter")
+        if (s.name() == QLatin1String("Splitter"))
 		{
 			Result = restoreSplitter(s, ChildNode, Testing);
 		}
-		else if (s.name() == "Area")
+        else if (s.name() == QLatin1String("Area"))
 		{
 			Result = restoreDockArea(s, ChildNode, Testing);
 		}
-		else if (s.name() == "Sizes")
+        else if (s.name() == QLatin1String("Sizes"))
 		{
 			QString sSizes = s.readElementText().trimmed();
             ADS_PRINT("Sizes: " << sSizes);
@@ -874,6 +957,10 @@ bool DockContainerWidgetPrivate::restoreSplitter(CDockingStateReader& s,
 		Splitter->addWidget(ChildNode);
 		Visible |= ChildNode->isVisibleTo(Splitter);
 	}
+    if(!Testing)
+    {
+       updateSplitterHandles(Splitter);
+    }
 
 	if (Sizes.count() != WidgetCount)
 	{
@@ -924,11 +1011,22 @@ bool DockContainerWidgetPrivate::restoreDockArea(CDockingStateReader& s,
 	if (!Testing)
 	{
 		DockArea = new CDockAreaWidget(DockManager, _this);
+		const auto AllowedAreasAttribute = s.attributes().value("AllowedAreas");
+		if (!AllowedAreasAttribute.isEmpty())
+		{
+			DockArea->setAllowedAreas((DockWidgetArea)AllowedAreasAttribute.toInt(nullptr, 16));
+		}
+
+		const auto FlagsAttribute = s.attributes().value("Flags");
+		if (!FlagsAttribute.isEmpty())
+		{
+			DockArea->setDockAreaFlags((CDockAreaWidget::DockAreaFlags)FlagsAttribute.toInt(nullptr, 16));
+		}
 	}
 
 	while (s.readNextStartElement())
 	{
-		if (s.name() != "Widget")
+        if (s.name() != QLatin1String("Widget"))
 		{
 			continue;
 		}
@@ -991,12 +1089,12 @@ bool DockContainerWidgetPrivate::restoreChildNodes(CDockingStateReader& s,
 	bool Result = true;
 	while (s.readNextStartElement())
 	{
-		if (s.name() == "Splitter")
+        if (s.name() == QLatin1String("Splitter"))
 		{
 			Result = restoreSplitter(s, CreatedWidget, Testing);
             ADS_PRINT("Splitter");
 		}
-		else if (s.name() == "Area")
+        else if (s.name() == QLatin1String("Area"))
 		{
 			Result = restoreDockArea(s, CreatedWidget, Testing);
             ADS_PRINT("DockAreaWidget");
@@ -1013,7 +1111,7 @@ bool DockContainerWidgetPrivate::restoreChildNodes(CDockingStateReader& s,
 
 
 //============================================================================
-CDockAreaWidget* DockContainerWidgetPrivate::dockWidgetIntoContainer(DockWidgetArea area,
+CDockAreaWidget* DockContainerWidgetPrivate::addDockWidgetToContainer(DockWidgetArea area,
 	CDockWidget* Dockwidget)
 {
 	CDockAreaWidget* NewDockArea = new CDockAreaWidget(DockManager, _this);
@@ -1040,7 +1138,8 @@ void DockContainerWidgetPrivate::addDockArea(CDockAreaWidget* NewDockArea, DockW
 	if (Splitter->orientation() == InsertParam.orientation())
 	{
 		insertWidgetIntoSplitter(Splitter, NewDockArea, InsertParam.append());
-		if (Splitter->isHidden())
+        updateSplitterHandles(Splitter);
+        if (Splitter->isHidden())
 		{
 			Splitter->show();
 		}
@@ -1053,14 +1152,16 @@ void DockContainerWidgetPrivate::addDockArea(CDockAreaWidget* NewDockArea, DockW
 			QLayoutItem* li = Layout->replaceWidget(Splitter, NewSplitter);
 			NewSplitter->addWidget(Splitter);
 			NewSplitter->addWidget(NewDockArea);
-			delete li;
+            updateSplitterHandles(NewSplitter);
+            delete li;
 		}
 		else
 		{
 			NewSplitter->addWidget(NewDockArea);
 			QLayoutItem* li = Layout->replaceWidget(Splitter, NewSplitter);
 			NewSplitter->addWidget(Splitter);
-			delete li;
+            updateSplitterHandles(NewSplitter);
+            delete li;
 		}
 		RootSplitter = NewSplitter;
 	}
@@ -1106,7 +1207,7 @@ void DockContainerWidgetPrivate::dumpRecursive(int level, QWidget* widget)
 		std::cout << (const char*)buf
 			<< (DockArea->isHidden() ? " " : "v")
 			<< (DockArea->openDockWidgetsCount() > 0 ? " " : "c")
-			<< " DockArea" << std::endl;
+			<< " DockArea " << "[hs: " << DockArea->sizePolicy().horizontalStretch() << ", vs: " <<  DockArea->sizePolicy().verticalStretch() << "]" << std::endl;
 		buf.fill(' ', (level + 1) * 4);
 		for (int i = 0; i < DockArea->dockWidgetsCount(); ++i)
 		{
@@ -1126,7 +1227,7 @@ void DockContainerWidgetPrivate::dumpRecursive(int level, QWidget* widget)
 
 
 //============================================================================
-CDockAreaWidget* DockContainerWidgetPrivate::dockWidgetIntoDockArea(DockWidgetArea area,
+CDockAreaWidget* DockContainerWidgetPrivate::addDockWidgetToDockArea(DockWidgetArea area,
 	CDockWidget* Dockwidget, CDockAreaWidget* TargetDockArea)
 {
 	if (CenterDockWidgetArea == area)
@@ -1144,20 +1245,34 @@ CDockAreaWidget* DockContainerWidgetPrivate::dockWidgetIntoDockArea(DockWidgetAr
 	int index = TargetAreaSplitter ->indexOf(TargetDockArea);
 	if (TargetAreaSplitter->orientation() == InsertParam.orientation())
 	{
-        ADS_PRINT("TargetAreaSplitter->orientation() == InsertParam.orientation()");
+		ADS_PRINT("TargetAreaSplitter->orientation() == InsertParam.orientation()");
 		TargetAreaSplitter->insertWidget(index + InsertParam.insertOffset(), NewDockArea);
+        updateSplitterHandles(TargetAreaSplitter);
+        // do nothing, if flag is not enabled
+		if (CDockManager::testConfigFlag(CDockManager::EqualSplitOnInsertion))
+		{
+			adjustSplitterSizesOnInsertion(TargetAreaSplitter);
+		}
 	}
 	else
 	{
-        ADS_PRINT("TargetAreaSplitter->orientation() != InsertParam.orientation()");
+		ADS_PRINT("TargetAreaSplitter->orientation() != InsertParam.orientation()");
+		auto TargetAreaSizes = TargetAreaSplitter->sizes();
 		QSplitter* NewSplitter = newSplitter(InsertParam.orientation());
 		NewSplitter->addWidget(TargetDockArea);
+
 		insertWidgetIntoSplitter(NewSplitter, NewDockArea, InsertParam.append());
-		TargetAreaSplitter->insertWidget(index, NewSplitter);
+        updateSplitterHandles(NewSplitter);
+        TargetAreaSplitter->insertWidget(index, NewSplitter);
+        updateSplitterHandles(TargetAreaSplitter);
+        if (CDockManager::testConfigFlag(CDockManager::EqualSplitOnInsertion))
+        {
+			TargetAreaSplitter->setSizes(TargetAreaSizes);
+			adjustSplitterSizesOnInsertion(NewSplitter);
+		}
 	}
 
-	appendDockAreas({NewDockArea});
-	emitDockAreasAdded();
+	addDockAreasToList({NewDockArea});
 	return NewDockArea;
 }
 
@@ -1211,11 +1326,11 @@ CDockAreaWidget* CDockContainerWidget::addDockWidget(DockWidgetArea area, CDockW
 	Dockwidget->setDockManager(d->DockManager);
 	if (DockAreaWidget)
 	{
-		return d->dockWidgetIntoDockArea(area, Dockwidget, DockAreaWidget);
+		return d->addDockWidgetToDockArea(area, Dockwidget, DockAreaWidget);
 	}
 	else
 	{
-		return d->dockWidgetIntoContainer(area, Dockwidget);
+		return d->addDockWidgetToContainer(area, Dockwidget);
 	}
 }
 
@@ -1288,9 +1403,9 @@ void CDockContainerWidget::removeDockArea(CDockAreaWidget* area)
 	internal::hideEmptyParentSplitters(Splitter);
 
 	// Remove this area from cached areas
-	const auto& cache = d->LastAddedAreaCache;
-	if (auto p = std::find(cache, cache+sizeof(cache)/sizeof(cache[0]), area)) {
-		d->LastAddedAreaCache[std::distance(cache, p)] = nullptr;
+	auto p = std::find(std::begin(d->LastAddedAreaCache), std::end(d->LastAddedAreaCache), area);
+	if (p != std::end(d->LastAddedAreaCache)) {
+		*p = nullptr;
 	}
 
 	// If splitter has more than 1 widgets, we are finished and can leave
@@ -1339,9 +1454,11 @@ void CDockContainerWidget::removeDockArea(CDockAreaWidget* area)
 	}
 
 	delete Splitter;
+    Splitter = nullptr;
 
 emitAndExit:
-	CDockWidget* TopLevelWidget = topLevelDockWidget();
+    updateSplitterHandles(Splitter);
+    CDockWidget* TopLevelWidget = topLevelDockWidget();
 
 	// Updated the title bar visibility of the dock widget if there is only
     // one single visible dock widget
@@ -1459,6 +1576,13 @@ void CDockContainerWidget::dropFloatingWidget(CFloatingDockContainer* FloatingWi
 		// level widget anymore
 		CDockWidget::emitTopLevelEventForWidget(SingleDockWidget, false);
 	}
+
+	window()->activateWindow();
+	if (SingleDroppedDockWidget)
+	{
+		d->DockManager->notifyWidgetOrAreaRelocation(SingleDroppedDockWidget);
+	}
+	d->DockManager->notifyFloatingWidgetDrop(FloatingWidget);
 }
 
 
@@ -1478,6 +1602,9 @@ void CDockContainerWidget::dropWidget(QWidget* Widget, DockWidgetArea DropArea,
 	// If there was a top level widget before the drop, then it is not top
 	// level widget anymore
 	CDockWidget::emitTopLevelEventForWidget(SingleDockWidget, false);
+
+	window()->activateWindow();
+	d->DockManager->notifyWidgetOrAreaRelocation(Widget);
 }
 
 
@@ -1537,7 +1664,7 @@ bool CDockContainerWidget::restoreState(CDockingStateReader& s, bool Testing)
 	if (IsFloating)
 	{
         ADS_PRINT("Restore floating widget");
-		if (!s.readNextStartElement() || s.name() != "Geometry")
+        if (!s.readNextStartElement() || s.name() != QLatin1String("Geometry"))
 		{
 			return false;
 		}
@@ -1680,6 +1807,13 @@ QList<CDockWidget*> CDockContainerWidget::dockWidgets() const
 }
 
 
+//============================================================================
+void CDockContainerWidget::updateSplitterHandles(QSplitter* splitter)
+{
+    d->updateSplitterHandles(splitter);
+}
+
+
 //============================================================================
 CDockWidget::DockWidgetFeatures CDockContainerWidget::features() const
 {

src/DockContainerWidget.h

@@ -155,6 +155,12 @@ protected:
      */
     QList<CDockWidget*> dockWidgets() const;
 
+    /**
+     * This function forces the dock container widget to update handles of splitters
+     * based on resize modes of dock widgets contained in the container.
+     */
+    void updateSplitterHandles(QSplitter* splitter);
+
 public:
 	/**
 	 * Default Constructor
@@ -193,7 +199,7 @@ public:
 	bool isInFrontOf(CDockContainerWidget* Other) const;
 
 	/**
-	 * Returns the dock area at teh given global position or 0 if there is no
+	 * Returns the dock area at the given global position or 0 if there is no
 	 * dock area at this position
 	 */
 	CDockAreaWidget* dockAreaAt(const QPoint& GlobalPos) const;
@@ -259,7 +265,7 @@ public:
 	 */
 	void closeOtherAreas(CDockAreaWidget* KeepOpenArea);
 
-signals:
+Q_SIGNALS:
 	/**
 	 * This signal is emitted if one or multiple dock areas has been added to
 	 * the internal list of dock areas.
@@ -276,7 +282,7 @@ signals:
 	 * This signal is emitted if a dock area is opened or closed via
 	 * toggleView() function
 	 */
-	void dockAreaViewToggled(CDockAreaWidget* DockArea, bool Open);
+	void dockAreaViewToggled(ads::CDockAreaWidget* DockArea, bool Open);
 }; // class DockContainerWidget
 } // namespace ads
 //-----------------------------------------------------------------------------

src/DockFocusController.cpp

@@ -0,0 +1,398 @@
+//============================================================================
+/// \file   DockFocusController.cpp
+/// \author Uwe Kindler
+/// \date   05.06.2020
+/// \brief  Implementation of CDockFocusController class
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include "DockFocusController.h"
+
+#include <algorithm>
+#include <iostream>
+
+#include <QPointer>
+#include <QApplication>
+#include <QAbstractButton>
+
+#include "DockWidget.h"
+#include "DockAreaWidget.h"
+#include "DockWidgetTab.h"
+#include "DockContainerWidget.h"
+#include "FloatingDockContainer.h"
+#include "DockManager.h"
+#include "DockAreaTitleBar.h"
+
+#ifdef Q_OS_LINUX
+#include "linux/FloatingWidgetTitleBar.h"
+#endif
+
+namespace ads
+{
+/**
+ * Private data class of CDockFocusController class (pimpl)
+ */
+struct DockFocusControllerPrivate
+{
+	CDockFocusController *_this;
+	QPointer<CDockWidget> FocusedDockWidget = nullptr;
+	QPointer<CDockAreaWidget> FocusedArea = nullptr;
+	CDockWidget* OldFocusedDockWidget = nullptr;
+#ifdef Q_OS_LINUX
+     QPointer<CFloatingDockContainer> FloatingWidget = nullptr;
+#endif
+	CDockManager* DockManager;
+    bool ForceFocusChangedSignal = false;
+
+	/**
+	 * Private data constructor
+	 */
+	DockFocusControllerPrivate(CDockFocusController *_public);
+
+	/**
+	 * This function updates the focus style of the given dock widget and
+	 * the dock area that it belongs to
+	 */
+	void updateDockWidgetFocus(CDockWidget* DockWidget);
+};
+// struct DockFocusControllerPrivate
+
+
+//===========================================================================
+static void updateDockWidgetFocusStyle(CDockWidget* DockWidget, bool Focused)
+{
+	DockWidget->setProperty("focused", Focused);
+	DockWidget->tabWidget()->setProperty("focused", Focused);
+	DockWidget->tabWidget()->updateStyle();
+	internal::repolishStyle(DockWidget);
+}
+
+
+//===========================================================================
+static void updateDockAreaFocusStyle(CDockAreaWidget* DockArea, bool Focused)
+{
+	DockArea->setProperty("focused", Focused);
+	internal::repolishStyle(DockArea);
+	internal::repolishStyle(DockArea->titleBar());
+}
+
+
+//===========================================================================
+#ifdef Q_OS_LINUX
+static void updateFloatingWidgetFocusStyle(CFloatingDockContainer* FloatingWidget, bool Focused)
+{
+	if (FloatingWidget->hasNativeTitleBar())
+	{
+		return;
+	}
+    auto TitleBar = qobject_cast<CFloatingWidgetTitleBar*>(FloatingWidget->titleBarWidget());
+    if (!TitleBar)
+    {
+        return;
+    }
+    TitleBar->setProperty("focused", Focused);
+    TitleBar->updateStyle();
+}
+#endif
+
+
+//============================================================================
+DockFocusControllerPrivate::DockFocusControllerPrivate(
+    CDockFocusController *_public) :
+	_this(_public)
+{
+
+}
+
+
+//============================================================================
+void DockFocusControllerPrivate::updateDockWidgetFocus(CDockWidget* DockWidget)
+{
+	if (!DockWidget->features().testFlag(CDockWidget::DockWidgetFocusable))
+	{
+		return;
+	}
+
+	CDockAreaWidget* NewFocusedDockArea = nullptr;
+	if (FocusedDockWidget)
+	{
+		updateDockWidgetFocusStyle(FocusedDockWidget, false);
+	}
+
+	CDockWidget* old = FocusedDockWidget;
+	FocusedDockWidget = DockWidget;
+	updateDockWidgetFocusStyle(FocusedDockWidget, true);
+	NewFocusedDockArea = FocusedDockWidget->dockAreaWidget();
+	if (NewFocusedDockArea && (FocusedArea != NewFocusedDockArea))
+	{
+		if (FocusedArea)
+		{
+			QObject::disconnect(FocusedArea, SIGNAL(viewToggled(bool)), _this, SLOT(onFocusedDockAreaViewToggled(bool)));
+			updateDockAreaFocusStyle(FocusedArea, false);
+		}
+
+		FocusedArea = NewFocusedDockArea;
+		updateDockAreaFocusStyle(FocusedArea, true);
+		QObject::connect(FocusedArea, SIGNAL(viewToggled(bool)), _this, SLOT(onFocusedDockAreaViewToggled(bool)));
+	}
+
+
+    auto NewFloatingWidget = FocusedDockWidget->dockContainer()->floatingWidget();
+    if (NewFloatingWidget)
+    {
+    	NewFloatingWidget->setProperty("FocusedDockWidget", QVariant::fromValue(DockWidget));
+    }
+
+
+#ifdef Q_OS_LINUX
+	// This code is required for styling the floating widget titlebar for linux
+	// depending on the current focus state
+    if (FloatingWidget == NewFloatingWidget)
+    {
+        return;
+    }
+
+    if (FloatingWidget)
+    {
+        updateFloatingWidgetFocusStyle(FloatingWidget, false);
+    }
+    FloatingWidget = NewFloatingWidget;
+
+    if (FloatingWidget)
+    {
+        updateFloatingWidgetFocusStyle(FloatingWidget, true);
+    }
+#endif
+
+    if (old == DockWidget && !ForceFocusChangedSignal)
+    {
+    	return;
+    }
+
+    ForceFocusChangedSignal = false;
+    if (DockWidget->isVisible())
+    {
+    	Q_EMIT DockManager->focusedDockWidgetChanged(old, DockWidget);
+    }
+    else
+    {
+    	OldFocusedDockWidget = old;
+    	QObject::connect(DockWidget, SIGNAL(visibilityChanged(bool)), _this, SLOT(onDockWidgetVisibilityChanged(bool)));
+    }
+}
+
+
+
+//============================================================================
+void CDockFocusController::onDockWidgetVisibilityChanged(bool Visible)
+{
+    auto Sender = sender();
+    auto DockWidget = qobject_cast<ads::CDockWidget*>(Sender);
+    disconnect(Sender, SIGNAL(visibilityChanged(bool)), this, SLOT(onDockWidgetVisibilityChanged(bool)));
+    if (DockWidget && Visible)
+	{
+        Q_EMIT d->DockManager->focusedDockWidgetChanged(d->OldFocusedDockWidget, DockWidget);
+	}
+}
+
+
+//============================================================================
+CDockFocusController::CDockFocusController(CDockManager* DockManager) :
+	Super(DockManager),
+	d(new DockFocusControllerPrivate(this))
+{
+	d->DockManager = DockManager;
+	connect(QApplication::instance(), SIGNAL(focusChanged(QWidget*, QWidget*)),
+			this, SLOT(onApplicationFocusChanged(QWidget*, QWidget*)));
+	connect(d->DockManager, SIGNAL(stateRestored()), SLOT(onStateRestored()));
+}
+
+//============================================================================
+CDockFocusController::~CDockFocusController()
+{
+	delete d;
+}
+
+
+//===========================================================================
+void CDockFocusController::onApplicationFocusChanged(QWidget* focusedOld, QWidget* focusedNow)
+{
+	if (d->DockManager->isRestoringState())
+	{
+		return;
+	}
+
+    ADS_PRINT("CDockFocusController::onApplicationFocusChanged "
+    	<< " old: " << focusedOld << " new: " << focusedNow);
+	if (!focusedNow)
+	{
+		return;
+	}
+
+	// If the close button in another tab steals the focus from the current
+	// active dock widget content, i.e. if the user clicks its close button,
+	// then we immediately give the focus back to the previous focused widget
+	// focusedOld
+	if (CDockManager::testConfigFlag(CDockManager::AllTabsHaveCloseButton))
+	{
+		auto OtherDockWidgetTab = internal::findParent<CDockWidgetTab*>(focusedNow);
+		if (OtherDockWidgetTab && focusedOld)
+		{
+			auto OldFocusedDockWidget = internal::findParent<CDockWidget*>(focusedOld);
+			if (OldFocusedDockWidget)
+			{
+				focusedOld->setFocus();
+			}
+			return;
+		}
+	}
+
+    CDockWidget* DockWidget = nullptr;
+	auto DockWidgetTab = qobject_cast<CDockWidgetTab*>(focusedNow);
+	if (DockWidgetTab)
+	{
+		DockWidget = DockWidgetTab->dockWidget();      
+        // If the DockWidgetTab "steals" the focus from a widget in the same
+        // DockWidget, then we immediately give the focus back to the previous
+        // focused widget focusedOld
+        if (focusedOld)
+        {
+            auto OldFocusedDockWidget = internal::findParent<CDockWidget*>(focusedOld);
+            if (OldFocusedDockWidget && OldFocusedDockWidget == DockWidget)
+            {
+                focusedOld->setFocus();
+            }
+        }
+	}
+
+	if (!DockWidget)
+	{
+		DockWidget = qobject_cast<CDockWidget*>(focusedNow);
+	}
+
+	if (!DockWidget)
+	{
+		DockWidget = internal::findParent<CDockWidget*>(focusedNow);
+	}
+
+#ifdef Q_OS_LINUX
+    if (!DockWidget)
+	{
+		return;
+	}
+#else
+    if (!DockWidget || DockWidget->tabWidget()->isHidden())
+	{
+    	return;
+	}
+#endif
+
+	d->updateDockWidgetFocus(DockWidget);
+}
+
+
+//===========================================================================
+void CDockFocusController::setDockWidgetFocused(CDockWidget* focusedNow)
+{
+	d->updateDockWidgetFocus(focusedNow);
+}
+
+
+//===========================================================================
+void CDockFocusController::onFocusedDockAreaViewToggled(bool Open)
+{
+	if (d->DockManager->isRestoringState())
+	{
+		return;
+	}
+
+	CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(sender());
+	if (!DockArea || Open)
+	{
+		return;
+	}
+	auto Container = DockArea->dockContainer();
+	auto OpenedDockAreas = Container->openedDockAreas();
+	if (OpenedDockAreas.isEmpty())
+	{
+		return;
+	}
+
+	CDockManager::setWidgetFocus(OpenedDockAreas[0]->currentDockWidget()->tabWidget());
+}
+
+
+//===========================================================================
+void CDockFocusController::notifyWidgetOrAreaRelocation(QWidget* DroppedWidget)
+{
+	if (d->DockManager->isRestoringState())
+	{
+		return;
+	}
+
+	CDockWidget* DockWidget = qobject_cast<CDockWidget*>(DroppedWidget);
+    if (!DockWidget)
+    {
+        CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(DroppedWidget);
+        if (DockArea)
+        {
+            DockWidget = DockArea->currentDockWidget();
+        }
+    }
+
+    if (!DockWidget)
+    {
+        return;
+    }
+
+    d->ForceFocusChangedSignal = true;
+    CDockManager::setWidgetFocus(DockWidget->tabWidget());
+}
+
+
+//===========================================================================
+void CDockFocusController::notifyFloatingWidgetDrop(CFloatingDockContainer* FloatingWidget)
+{
+	if (!FloatingWidget || d->DockManager->isRestoringState())
+	{
+		return;
+	}
+
+	auto vDockWidget = FloatingWidget->property("FocusedDockWidget");
+	if (!vDockWidget.isValid())
+	{
+		return;
+	}
+
+	auto DockWidget = vDockWidget.value<CDockWidget*>();
+	if (DockWidget)
+	{
+		d->FocusedDockWidget = nullptr;
+		DockWidget->dockAreaWidget()->setCurrentDockWidget(DockWidget);
+		CDockManager::setWidgetFocus(DockWidget->tabWidget());
+	}
+}
+
+
+//==========================================================================
+void CDockFocusController::onStateRestored()
+{
+	if (d->FocusedDockWidget)
+	{
+		updateDockWidgetFocusStyle(d->FocusedDockWidget, false);
+	}
+}
+
+
+//==========================================================================
+CDockWidget* CDockFocusController::focusedDockWidget() const
+{
+	return d->FocusedDockWidget.data();
+}
+
+} // namespace ads
+
+//---------------------------------------------------------------------------
+// EOF DockFocusController.cpp

src/DockFocusController.h

@@ -0,0 +1,96 @@
+#ifndef DockFocusControllerH
+#define DockFocusControllerH
+//============================================================================
+/// \file   DockFocusController.h
+/// \author Uwe Kindler
+/// \date   05.06.2020
+/// \brief  Declaration of CDockFocusController class
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include <QObject>
+#include "ads_globals.h"
+#include "DockManager.h"
+
+namespace ads
+{
+struct DockFocusControllerPrivate;
+class CDockManager;
+class CFloatingDockContainer;
+
+/**
+ * Manages focus styling of dock widgets and handling of focus changes
+ */
+class ADS_EXPORT CDockFocusController : public QObject
+{
+	Q_OBJECT
+private:
+	DockFocusControllerPrivate* d; ///< private data (pimpl)
+    friend struct DockFocusControllerPrivate;
+
+private Q_SLOTS:
+	void onApplicationFocusChanged(QWidget *old, QWidget *now);
+	void onFocusedDockAreaViewToggled(bool Open);
+	void onStateRestored();
+	void onDockWidgetVisibilityChanged(bool Visible);
+
+public:
+	using Super = QObject;
+	/**
+	 * Default Constructor
+	 */
+	CDockFocusController(CDockManager* DockManager);
+
+	/**
+	 * Virtual Destructor
+	 */
+	virtual ~CDockFocusController();
+
+	/**
+	 * Helper function to set focus depending on the configuration of the
+	 * FocusStyling flag
+	 */
+	template <class QWidgetPtr>
+	static void setWidgetFocus(QWidgetPtr widget)
+	{
+		if (!CDockManager::testConfigFlag(CDockManager::FocusHighlighting))
+		{
+			return;
+		}
+
+		widget->setFocus(Qt::OtherFocusReason);
+	}
+
+	/**
+	 * A container needs to call this function if a widget has been dropped
+	 * into it
+	 */
+	void notifyWidgetOrAreaRelocation(QWidget* RelocatedWidget);
+
+	/**
+	 * This function is called, if a floating widget has been dropped into
+	 * an new position.
+	 * When this function is called, all dock widgets of the FloatingWidget
+	 * are already inserted into its new position
+	 */
+	void notifyFloatingWidgetDrop(CFloatingDockContainer* FloatingWidget);
+
+	/**
+	 * Returns the dock widget that has focus style in the ui or a nullptr if
+	 * not dock widget is painted focused.
+	 */
+	CDockWidget* focusedDockWidget() const;
+
+public Q_SLOTS:
+	/**
+	 * Request a focus change to the given dock widget
+	 */
+	void setDockWidgetFocused(CDockWidget* focusedNow);
+}; // class DockFocusController
+}
+ // namespace ads
+//-----------------------------------------------------------------------------
+#endif // DockFocusControllerH
+

src/DockManager.cpp

@@ -53,6 +53,13 @@
 #include "DockAreaWidget.h"
 #include "IconProvider.h"
 #include "DockingStateReader.h"
+#include "DockAreaTitleBar.h"
+#include "DockFocusController.h"
+#include "DockSplitter.h"
+
+#ifdef Q_OS_LINUX
+#include "linux/FloatingWidgetTitleBar.h"
+#endif
 
 
 /**
@@ -60,7 +67,7 @@
  * name. Normally, when resources are built as part of the application, the
  * resources are loaded automatically at startup. The Q_INIT_RESOURCE() macro
  * is necessary on some platforms for resources stored in a static library.
- * Because GCC caues a linker error if we put Q_INIT_RESOURCE into the
+ * Because GCC causes a linker error if we put Q_INIT_RESOURCE into the
  * loadStyleSheet() function, we place it into a function outside of the ads
  * namespace
  */
@@ -72,6 +79,16 @@ static void initResource()
 
 namespace ads
 {
+/**
+ * Internal file version in case the structure changes internally
+ */
+enum eStateFileVersion
+{
+	InitialVersion = 0,      //!< InitialVersion
+	Version1 = 1,            //!< Version1
+	CurrentVersion = Version1//!< CurrentVersion
+};
+
 static CDockManager::ConfigFlags StaticConfigFlags = CDockManager::DefaultNonOpaqueConfig;
 
 /**
@@ -91,6 +108,8 @@ struct DockManagerPrivate
 	CDockManager::eViewMenuInsertionOrder MenuInsertionOrder = CDockManager::MenuAlphabeticallySorted;
 	bool RestoringState = false;
 	QVector<CFloatingDockContainer*> UninitializedFloatingWidgets;
+	CDockFocusController* FocusController = nullptr;
+    CDockWidget* CentralWidget = nullptr;
 
 	/**
 	 * Private data constructor
@@ -164,11 +183,14 @@ void DockManagerPrivate::loadStylesheet()
 {
 	initResource();
 	QString Result;
+	QString FileName = ":ads/stylesheets/";
+	FileName += CDockManager::testConfigFlag(CDockManager::FocusHighlighting)
+		? "focus_highlighting" : "default";
 #ifdef Q_OS_LINUX
-    QFile StyleSheetFile(":ads/stylesheets/default_linux.css");
-#else
-	QFile StyleSheetFile(":ads/stylesheets/default.css");
+    FileName += "_linux";
 #endif
+    FileName += ".css";
+	QFile StyleSheetFile(FileName);
 	StyleSheetFile.open(QIODevice::ReadOnly);
 	QTextStream StyleSheetStream(&StyleSheetFile);
 	Result = StyleSheetStream.readAll();
@@ -228,7 +250,7 @@ bool DockManagerPrivate::restoreStateFromXml(const QByteArray &state,  int versi
     }
     CDockingStateReader s(state);
     s.readNextStartElement();
-    if (s.name() != "QtAdvancedDockingSystem")
+    if (s.name() != QLatin1String("QtAdvancedDockingSystem"))
     {
     	return false;
     }
@@ -239,17 +261,50 @@ bool DockManagerPrivate::restoreStateFromXml(const QByteArray &state,  int versi
     {
     	return false;
     }
-
     s.setFileVersion(v);
+
+    ADS_PRINT(s.attributes().value("UserVersion"));
+    // Older files do not support UserVersion but we still want to load them so
+    // we first test if the attribute exists
+    if (!s.attributes().value("UserVersion").isEmpty())
+    {
+		v = s.attributes().value("UserVersion").toInt(&ok);
+		if (!ok || v != version)
+		{
+			return false;
+		}
+    }
+
     bool Result = true;
 #ifdef ADS_DEBUG_PRINT
     int  DockContainers = s.attributes().value("Containers").toInt();
 #endif
     ADS_PRINT(DockContainers);
+
+    if (CentralWidget)
+    {
+		const auto CentralWidgetAttribute = s.attributes().value("CentralWidget");
+		// If we have a central widget but a state without central widget, then
+		// something is wrong.
+		if (CentralWidgetAttribute.isEmpty())
+		{
+			qWarning() << "Dock manager has central widget but saved state does not have central widget.";
+			return false;
+		}
+
+		// If the object name of the central widget does not match the name of the
+		// saved central widget, the something is wrong
+		if (CentralWidget->objectName() != CentralWidgetAttribute.toString())
+		{
+			qWarning() << "Object name of central widget does not match name of central widget in saved state.";
+			return false;
+		}
+    }
+
     int DockContainerCount = 0;
     while (s.readNextStartElement())
     {
-    	if (s.name() == "Container")
+        if (s.name() == QLatin1String("Container"))
     	{
     		Result = restoreContainer(DockContainerCount, s, Testing);
 			if (!Result)
@@ -264,11 +319,11 @@ bool DockManagerPrivate::restoreStateFromXml(const QByteArray &state,  int versi
     {
 		// Delete remaining empty floating widgets
 		int FloatingWidgetIndex = DockContainerCount - 1;
-		int DeleteCount = FloatingWidgets.count() - FloatingWidgetIndex;
-		for (int i = 0; i < DeleteCount; ++i)
+		for (int i = FloatingWidgetIndex; i < FloatingWidgets.count(); ++i)
 		{
-			FloatingWidgets[FloatingWidgetIndex + i]->deleteLater();
-			_this->removeDockContainer(FloatingWidgets[FloatingWidgetIndex + i]->dockContainer());
+			auto* floatingWidget = FloatingWidgets[i];
+			_this->removeDockContainer(floatingWidget->dockContainer());
+			floatingWidget->deleteLater();
 		}
     }
 
@@ -288,7 +343,7 @@ void DockManagerPrivate::restoreDockWidgetsOpenState()
     	if (DockWidget->property(internal::DirtyProperty).toBool())
     	{
     		DockWidget->flagAsUnassigned();
-            emit DockWidget->viewToggled(false);
+            Q_EMIT DockWidget->viewToggled(false);
     	}
     	else
     	{
@@ -335,8 +390,6 @@ void DockManagerPrivate::restoreDockAreasIndices()
     }
 }
 
-
-
 //============================================================================
 void DockManagerPrivate::emitTopLevelEvents()
 {
@@ -387,6 +440,7 @@ bool DockManagerPrivate::restoreState(const QByteArray& State, int version)
     restoreDockWidgetsOpenState();
     restoreDockAreasIndices();
     emitTopLevelEvents();
+    _this->dumpLayout();
 
     return true;
 }
@@ -437,6 +491,15 @@ CDockManager::CDockManager(QWidget *parent) :
 	d->ContainerOverlay = new CDockOverlay(this, CDockOverlay::ModeContainerOverlay);
 	d->Containers.append(this);
 	d->loadStylesheet();
+
+	if (CDockManager::testConfigFlag(CDockManager::FocusHighlighting))
+	{
+		d->FocusController = new CDockFocusController(this);
+	}
+
+#ifdef Q_OS_LINUX
+	window()->installEventFilter(this);
+#endif
 }
 
 //============================================================================
@@ -450,12 +513,76 @@ CDockManager::~CDockManager()
 	delete d;
 }
 
+//============================================================================
+#ifdef Q_OS_LINUX
+bool CDockManager::eventFilter(QObject *obj, QEvent *e)
+{
+	// Emulate Qt:Tool behaviour.
+	// Required because on some WMs Tool windows can't be maximized.
+
+	// Window always on top of the MainWindow.
+	if (e->type() == QEvent::WindowActivate)
+	{
+		for (auto _window : floatingWidgets())
+		{
+			if (!_window->isVisible() || window()->isMinimized())
+			{
+				continue;
+			}
+			// setWindowFlags(Qt::WindowStaysOnTopHint) will hide the window and thus requires a show call.
+			// This then leads to flickering and a nasty endless loop (also buggy behaviour on Ubuntu).
+			// So we just do it ourself.
+			internal::xcb_update_prop(true, _window->window()->winId(),
+				"_NET_WM_STATE", "_NET_WM_STATE_ABOVE", "_NET_WM_STATE_STAYS_ON_TOP");
+		}
+	}
+	else if (e->type() == QEvent::WindowDeactivate)
+	{
+		for (auto _window : floatingWidgets())
+		{
+			if (!_window->isVisible() || window()->isMinimized())
+			{
+				continue;
+			}
+			internal::xcb_update_prop(false, _window->window()->winId(),
+				"_NET_WM_STATE", "_NET_WM_STATE_ABOVE", "_NET_WM_STATE_STAYS_ON_TOP");
+			_window->raise();
+		}
+	}
+
+	// Sync minimize with MainWindow
+	if (e->type() == QEvent::WindowStateChange)
+	{
+		for (auto _window : floatingWidgets())
+		{
+			if (! _window->isVisible())
+			{
+				continue;
+			}
+
+			if (window()->isMinimized())
+			{
+				_window->showMinimized();
+			}
+			else
+			{
+				_window->setWindowState(_window->windowState() & (~Qt::WindowMinimized));
+			}
+		}
+		if (!window()->isMinimized())
+		{
+			QApplication::setActiveWindow(window());
+		}
+	}
+	return Super::eventFilter(obj, e);
+}
+#endif
 
 //============================================================================
 void CDockManager::registerFloatingWidget(CFloatingDockContainer* FloatingWidget)
 {
 	d->FloatingWidgets.append(FloatingWidget);
-	emit floatingWidgetCreated(FloatingWidget);
+	Q_EMIT floatingWidgetCreated(FloatingWidget);
     ADS_PRINT("d->FloatingWidgets.count() " << d->FloatingWidgets.count());
 }
 
@@ -528,8 +655,13 @@ QByteArray CDockManager::saveState(int version) const
 	s.setAutoFormatting(ConfigFlags.testFlag(XmlAutoFormattingEnabled));
     s.writeStartDocument();
 		s.writeStartElement("QtAdvancedDockingSystem");
-		s.writeAttribute("Version", QString::number(version));
+		s.writeAttribute("Version", QString::number(CurrentVersion));
+		s.writeAttribute("UserVersion", QString::number(version));
 		s.writeAttribute("Containers", QString::number(d->Containers.count()));
+		if (d->CentralWidget)
+		{
+			s.writeAttribute("CentralWidget", d->CentralWidget->objectName());
+		}
 		for (auto Container : d->Containers)
 		{
 			Container->saveState(s);
@@ -567,15 +699,14 @@ bool CDockManager::restoreState(const QByteArray &state, int version)
 		hide();
 	}
 	d->RestoringState = true;
-	emit restoringState();
+	Q_EMIT restoringState();
 	bool Result = d->restoreState(state, version);
 	d->RestoringState = false;
-	emit stateRestored();
 	if (!IsHidden)
 	{
 		show();
 	}
-
+	Q_EMIT stateRestored();
 	return Result;
 }
 
@@ -601,6 +732,7 @@ CFloatingDockContainer* CDockManager::addDockWidgetFloating(CDockWidget* Dockwid
 	{
 		d->UninitializedFloatingWidgets.append(FloatingWidget);
 	}
+	Q_EMIT dockWidgetAdded(Dockwidget);
 	return FloatingWidget;
 }
 
@@ -627,7 +759,10 @@ CDockAreaWidget* CDockManager::addDockWidget(DockWidgetArea area,
 	CDockWidget* Dockwidget, CDockAreaWidget* DockAreaWidget)
 {
 	d->DockWidgetsMap.insert(Dockwidget->objectName(), Dockwidget);
-	return CDockContainerWidget::addDockWidget(area, Dockwidget, DockAreaWidget);
+	auto Container = DockAreaWidget ? DockAreaWidget->dockContainer(): this;
+	auto AreaOfAddedDockWidget = Container->addDockWidget(area, Dockwidget, DockAreaWidget);
+	Q_EMIT dockWidgetAdded(Dockwidget);
+	return AreaOfAddedDockWidget;
 }
 
 
@@ -668,10 +803,11 @@ CDockWidget* CDockManager::findDockWidget(const QString& ObjectName) const
 //============================================================================
 void CDockManager::removeDockWidget(CDockWidget* Dockwidget)
 {
-	emit dockWidgetAboutToBeRemoved(Dockwidget);
+	Q_EMIT dockWidgetAboutToBeRemoved(Dockwidget);
 	d->DockWidgetsMap.remove(Dockwidget->objectName());
 	CDockContainerWidget::removeDockWidget(Dockwidget);
-	emit dockWidgetRemoved(Dockwidget);
+	Dockwidget->setDockManager(nullptr);
+	Q_EMIT dockWidgetRemoved(Dockwidget);
 }
 
 //============================================================================
@@ -685,7 +821,7 @@ QMap<QString, CDockWidget*> CDockManager::dockWidgetsMap() const
 void CDockManager::addPerspective(const QString& UniquePrespectiveName)
 {
 	d->Perspectives.insert(UniquePrespectiveName, saveState());
-	emit perspectiveListChanged();
+	Q_EMIT perspectiveListChanged();
 }
 
 
@@ -707,8 +843,8 @@ void CDockManager::removePerspectives(const QStringList& Names)
 
 	if (Count)
 	{
-		emit perspectivesRemoved();
-		emit perspectiveListChanged();
+		Q_EMIT perspectivesRemoved();
+		Q_EMIT perspectiveListChanged();
 	}
 }
 
@@ -729,9 +865,9 @@ void CDockManager::openPerspective(const QString& PerspectiveName)
 		return;
 	}
 
-	emit openingPerspective(PerspectiveName);
+	Q_EMIT openingPerspective(PerspectiveName);
 	restoreState(Iterator.value());
-	emit perspectiveOpened(PerspectiveName);
+	Q_EMIT perspectiveOpened(PerspectiveName);
 }
 
 
@@ -778,6 +914,50 @@ void CDockManager::loadPerspectives(QSettings& Settings)
 	Settings.endArray();
 }
 
+
+//============================================================================
+CDockWidget* CDockManager::centralWidget() const
+{
+    return d->CentralWidget;
+}
+
+
+//============================================================================
+CDockAreaWidget* CDockManager::setCentralWidget(CDockWidget* widget)
+{
+	if (!widget)
+	{
+		d->CentralWidget = nullptr;
+		return nullptr;
+	}
+
+	// Setting a new central widget is now allowed if there is already a central
+	// widget or if there are already other dock widgets
+	if (d->CentralWidget)
+	{
+		qWarning("Setting a central widget not possible because there is already a central widget.");
+		return nullptr;
+	}
+
+	// Setting a central widget is now allowed if there are already other
+	// dock widgets.
+	if (!d->DockWidgetsMap.isEmpty())
+	{
+		qWarning("Setting a central widget not possible - the central widget need to be the first "
+			"dock widget that is added to the dock manager.");
+		return nullptr;
+	}
+
+
+	widget->setFeature(CDockWidget::DockWidgetClosable, false);
+	widget->setFeature(CDockWidget::DockWidgetMovable, false);
+	widget->setFeature(CDockWidget::DockWidgetFloatable, false);
+	d->CentralWidget = widget;
+	CDockAreaWidget* CentralArea = addDockWidget(CenterDockWidgetArea, widget);
+	CentralArea->setDockAreaFlag(CDockAreaWidget::eDockAreaFlag::HideSingleWidgetTitleBar, true);
+	return CentralArea;
+}
+
 //============================================================================
 QAction* CDockManager::addToggleViewActionToMenu(QAction* ToggleViewAction,
 	const QString& Group, const QIcon& GroupIcon)
@@ -872,6 +1052,78 @@ CIconProvider& CDockManager::iconProvider()
 }
 
 
+//===========================================================================
+void CDockManager::notifyWidgetOrAreaRelocation(QWidget* DroppedWidget)
+{
+	if (d->FocusController)
+	{
+		d->FocusController->notifyWidgetOrAreaRelocation(DroppedWidget);
+	}
+}
+
+
+//===========================================================================
+void CDockManager::notifyFloatingWidgetDrop(CFloatingDockContainer* FloatingWidget)
+{
+	if (d->FocusController)
+	{
+		d->FocusController->notifyFloatingWidgetDrop(FloatingWidget);
+	}
+}
+
+
+//===========================================================================
+void CDockManager::setDockWidgetFocused(CDockWidget* DockWidget)
+{
+	if (d->FocusController)
+	{
+		d->FocusController->setDockWidgetFocused(DockWidget);
+	}
+}
+
+
+//===========================================================================
+CDockWidget* CDockManager::focusedDockWidget() const
+{
+	if (!d->FocusController)
+	{
+		return nullptr;
+	}
+	else
+	{
+		return d->FocusController->focusedDockWidget();
+	}
+}
+
+//===========================================================================
+QList<int> CDockManager::splitterSizes(CDockAreaWidget *ContainedArea) const
+{
+    if (ContainedArea)
+    {
+        auto Splitter = internal::findParent<CDockSplitter*>(ContainedArea);
+        if (Splitter)
+        {
+            return Splitter->sizes();
+        }
+    }
+    return QList<int>();
+}
+
+//===========================================================================
+void CDockManager::setSplitterSizes(CDockAreaWidget *ContainedArea, const QList<int>& sizes)
+{
+    if (!ContainedArea)
+    {
+        return;
+    }
+
+    auto Splitter = internal::findParent<CDockSplitter*>(ContainedArea);
+    if (Splitter && Splitter->count() == sizes.count())
+    {
+        Splitter->setSizes(sizes);
+    }
+}
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockManager.h

@@ -84,6 +84,7 @@ private:
 	friend struct FloatingDragPreviewPrivate;
 	friend class CDockAreaTitleBar;
 
+
 protected:
 	/**
 	 * Registers the given floating widget in the internal list of
@@ -118,6 +119,22 @@ protected:
 	 */
 	CDockOverlay* dockAreaOverlay() const;
 
+
+	/**
+	 * A container needs to call this function if a widget has been dropped
+	 * into it
+	 */
+	void notifyWidgetOrAreaRelocation(QWidget* RelocatedWidget);
+
+	/**
+	 * This function is called, if a floating widget has been dropped into
+	 * an new position.
+	 * When this function is called, all dock widgets of the FloatingWidget
+	 * are already inserted into its new position
+	 */
+	void notifyFloatingWidgetDrop(CFloatingDockContainer* FloatingWidget);
+
+
 	/**
 	 * Show the floating widgets that has been created floating
 	 */
@@ -162,6 +179,15 @@ public:
 		HideSingleCentralWidgetTitleBar = 0x100000, //!< If there is only one single visible dock widget in the main dock container (the dock manager) and if this flag is set, then the titlebar of this dock widget will be hidden
 		                                            //!< this only makes sense for non draggable and non floatable widgets and enables the creation of some kind of "central" widget
 
+		FocusHighlighting = 0x200000, //!< enables styling of focused dock widget tabs or floating widget titlebar
+		EqualSplitOnInsertion = 0x400000, ///!< if enabled, the space is equally distributed to all widgets in a  splitter
+
+		FloatingContainerForceNativeTitleBar = 0x800000, //!< Linux only ! Forces all FloatingContainer to use the native title bar. This might break docking for FloatinContainer on some Window Managers (like Kwin/KDE).
+														 //!< If neither this nor FloatingContainerForceCustomTitleBar is set (the default) native titlebars are used except on known bad systems.
+														 //! Users can overwrite this by setting the environment variable ADS_UseNativeTitle to "1" or "0".
+        FloatingContainerForceQWidgetTitleBar = 0x1000000,//!< Linux only ! Forces all FloatingContainer to use a QWidget based title bar.
+														 //!< If neither this nor FloatingContainerForceNativeTitleBar is set (the default) native titlebars are used except on known bad systems.
+														 //! Users can overwrite this by setting the environment variable ADS_UseNativeTitle to "1" or "0".
 
         DefaultDockAreaButtons = DockAreaHasCloseButton
 							   | DockAreaHasUndockButton
@@ -308,8 +334,12 @@ public:
 	 * If auto formatting is enabled, the output is intended and line wrapped.
 	 * The XmlMode XmlAutoFormattingDisabled is better if you would like to have
 	 * a more compact XML output - i.e. for storage in ini files.
+	 * The version number is stored as part of the data.
+	 * To restore the saved state, pass the return value and version number
+	 * to restoreState().
+	 * \see restoreState()
 	 */
-	QByteArray saveState(int version = Version1) const;
+	QByteArray saveState(int version = 0) const;
 
 	/**
 	 * Restores the state of this dockmanagers dockwidgets.
@@ -317,8 +347,9 @@ public:
 	 * not match, the dockmanager's state is left unchanged, and this function
 	 * returns false; otherwise, the state is restored, and this function
 	 * returns true.
+	 * \see saveState()
 	 */
-	bool restoreState(const QByteArray &state, int version = Version1);
+	bool restoreState(const QByteArray &state, int version = 0);
 
 	/**
 	 * Saves the current perspective to the internal list of perspectives.
@@ -355,7 +386,31 @@ public:
 	 */
 	void loadPerspectives(QSettings& Settings);
 
-	/**
+    /**
+     * This function returns managers central widget or nullptr if no central widget is set.
+     */
+    CDockWidget* centralWidget() const;
+
+    /**
+     * Adds dockwidget widget into the central area and marks it as central widget.
+     * If central widget is set, it will be the only dock widget
+     * that will resize with the dock container. A central widget if not
+     * movable, floatable or closable and the titlebar of the central
+     * dock area is not visible.
+     * If the given widget could be set as central widget, the function returns
+     * the created dock area. If the widget could not be set, because there
+     * is already a central widget, this function returns a nullptr.
+     * To clear the central widget, pass a nullptr to the function.
+     * \note Setting a central widget is only possible if no other dock widgets
+     * have been registered before. That means, this function should be the
+     * first function that you call before you add other dock widgets.
+     * \retval != 0 The dock area that contains the central widget
+     * \retval nullptr Indicates that the given widget can not be set as central
+     *         widget because there is already a central widget.
+     */
+    CDockAreaWidget* setCentralWidget(CDockWidget* widget);
+
+    /**
 	 * Adds a toggle view action to the the internal view menu.
 	 * You can either manage the insertion of the toggle view actions in your
 	 * application or you can add the actions to the internal view menu and
@@ -405,13 +460,66 @@ public:
 	 */
 	static int startDragDistance();
 
-public slots:
+	/**
+	 * Helper function to set focus depending on the configuration of the
+	 * FocusStyling flag
+	 */
+	template <class QWidgetPtr>
+	static void setWidgetFocus(QWidgetPtr widget)
+	{
+		if (!CDockManager::testConfigFlag(CDockManager::FocusHighlighting))
+		{
+			return;
+		}
+
+		widget->setFocus(Qt::OtherFocusReason);
+	}
+
+#ifdef Q_OS_LINUX
+	bool eventFilter(QObject *obj, QEvent *e) override;
+#endif
+
+	/**
+	 * Returns the dock widget that has focus style in the ui or a nullptr if
+	 * not dock widget is painted focused.
+	 * If the flag FocusHighlighting is disabled, this function always returns
+	 * nullptr.
+	 */
+	CDockWidget* focusedDockWidget() const;
+
+    /**
+     * Returns the sizes of the splitter that contains the dock area.
+     *
+     * If there is no splitter that contains the area, an empty list will be
+     * returned.
+     */
+    QList<int> splitterSizes(CDockAreaWidget *ContainedArea) const;
+
+    /**
+     * Update the sizes of a splitter
+     * Programmatically updates the sizes of a given splitter by calling
+     * QSplitter::setSizes(). The splitter will be the splitter that
+     * contains the supplied dock area widget. If there is not splitter
+     * that contains the dock area, or the sizes supplied does not match
+     * the number of children of the splitter, this method will have no
+     * effect.
+     */
+    void setSplitterSizes(CDockAreaWidget *ContainedArea, const QList<int>& sizes);
+
+public Q_SLOTS:
 	/**
 	 * Opens the perspective with the given name.
 	 */
 	void openPerspective(const QString& PerspectiveName);
 
-signals:
+	/**
+	 * Request a focus change to the given dock widget.
+	 * This function only has an effect, if the flag CDockManager::FocusStyling
+	 * is enabled
+	 */
+	void setDockWidgetFocused(CDockWidget* DockWidget);
+
+Q_SIGNALS:
 	/**
 	 * This signal is emitted if the list of perspectives changed
 	 */
@@ -457,20 +565,26 @@ signals:
 	 * An application can use this signal to e.g. subscribe to events of
 	 * the newly created window.
 	 */
-	void floatingWidgetCreated(CFloatingDockContainer* FloatingWidget);
+	void floatingWidgetCreated(ads::CFloatingDockContainer* FloatingWidget);
 
     /**
      * This signal is emitted, if a new DockArea has been created.
      * An application can use this signal to set custom icons or custom
      * tooltips for the DockArea buttons.
      */
-    void dockAreaCreated(CDockAreaWidget* DockArea);
+    void dockAreaCreated(ads::CDockAreaWidget* DockArea);
+
+    /**
+     * This signal is emitted if a dock widget has been added to this
+     * dock manager instance.
+     */
+    void dockWidgetAdded(ads::CDockWidget* DockWidget);
 
     /**
      * This signal is emitted just before the given dock widget is removed
-     * from the
+     * from the dock manager
      */
-    void dockWidgetAboutToBeRemoved(CDockWidget* DockWidget);
+    void dockWidgetAboutToBeRemoved(ads::CDockWidget* DockWidget);
 
     /**
      * This signal is emitted if a dock widget has been removed with the remove
@@ -478,7 +592,14 @@ signals:
      * If this signal is emitted, the dock widget has been removed from the
      * docking system but it is not deleted yet.
      */
-    void dockWidgetRemoved(CDockWidget* DockWidget);
+    void dockWidgetRemoved(ads::CDockWidget* DockWidget);
+
+    /**
+     * This signal is emitted if the focused dock widget changed.
+     * Both old and now can be nullptr.
+     * The focused dock widget is the one that is highlighted in the GUI
+     */
+    void focusedDockWidgetChanged(ads::CDockWidget* old, ads::CDockWidget* now);
 }; // class DockManager
 } // namespace ads
 //-----------------------------------------------------------------------------

src/DockOverlay.cpp

@@ -806,10 +806,15 @@ void CDockOverlayCross::setIconColors(const QString& Colors)
 		{"Arrow", CDockOverlayCross::ArrowColor},
 		{"Shadow", CDockOverlayCross::ShadowColor}};
 
-	auto ColorList = Colors.split(' ', QString::SkipEmptyParts);
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
+    auto SkipEmptyParts = QString::SkipEmptyParts;
+#else
+    auto SkipEmptyParts = Qt::SkipEmptyParts;
+#endif
+    auto ColorList = Colors.split(' ', SkipEmptyParts);
 	for (const auto& ColorListEntry : ColorList)
 	{
-		auto ComponentColor = ColorListEntry.split('=', QString::SkipEmptyParts);
+        auto ComponentColor = ColorListEntry.split('=', SkipEmptyParts);
 		int Component = ColorCompenentStringMap.value(ComponentColor[0], -1);
 		if (Component < 0)
 		{

src/DockSplitter.cpp

@@ -31,7 +31,7 @@
 
 #include <QDebug>
 #include <QChildEvent>
-
+#include <QVariant>
 #include "DockAreaWidget.h"
 
 namespace ads
@@ -52,7 +52,7 @@ CDockSplitter::CDockSplitter(QWidget *parent)
 	: QSplitter(parent),
 	  d(new DockSplitterPrivate(this))
 {
-	setProperty("ads-splitter", true);
+    setProperty("ads-splitter", QVariant(true));
 	setChildrenCollapsible(false);
 }
 
@@ -102,6 +102,20 @@ QWidget* CDockSplitter::lastWidget() const
 	return (count() > 0) ? widget(count() - 1) : nullptr;
 }
 
+//============================================================================
+bool CDockSplitter::isResizingWithContainer() const
+{
+    for (auto area : findChildren<CDockAreaWidget*>())
+    {
+        if(area->isCentralWidgetArea())
+        {
+            return true;
+        }
+    }
+
+    return false;
+}
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockSplitter.h

@@ -71,6 +71,11 @@ public:
 	 * Returns last widget of nullptr is splitter is empty
 	 */
 	QWidget* lastWidget() const;
+
+    /**
+     * Returns true if the splitter contains central widget of dock manager.
+     */
+    bool isResizingWithContainer() const;
 }; // class CDockSplitter
 
 } // namespace ads

src/DockWidget.cpp

@@ -134,6 +134,7 @@ void DockWidgetPrivate::showDockWidget()
 	{
 		CFloatingDockContainer* FloatingWidget = new CFloatingDockContainer(_this);
 		FloatingWidget->resize(_this->size());
+		TabWidget->show();
 		FloatingWidget->show();
 	}
 	else
@@ -235,6 +236,11 @@ CDockWidget::CDockWidget(const QString &title, QWidget *parent) :
 	connect(d->ToggleViewAction, SIGNAL(triggered(bool)), this,
 		SLOT(toggleView(bool)));
 	setToolbarFloatingStyle(false);
+
+	if (CDockManager::testConfigFlag(CDockManager::FocusHighlighting))
+	{
+		setFocusPolicy(Qt::ClickFocus);
+	}
 }
 
 //============================================================================
@@ -332,8 +338,10 @@ void CDockWidget::setFeatures(DockWidgetFeatures features)
 		return;
 	}
 	d->Features = features;
-	emit featuresChanged(d->Features);
+	Q_EMIT featuresChanged(d->Features);
 	d->TabWidget->onDockWidgetFeaturesChanged();
+	if(CDockAreaWidget* DockArea = dockAreaWidget())
+		DockArea->onDockWidgetFeaturesChanged();
 }
 
 
@@ -455,6 +463,13 @@ void CDockWidget::setMinimumSizeHintMode(eMinimumSizeHintMode Mode)
 }
 
 
+//============================================================================
+bool CDockWidget::isCentralWidget() const
+{
+    return dockManager()->centralWidget() == this;
+}
+
+
 //============================================================================
 void CDockWidget::toggleView(bool Open)
 {
@@ -523,9 +538,9 @@ void CDockWidget::toggleViewInternal(bool Open)
 
 	if (!Open)
 	{
-		emit closed();
+		Q_EMIT closed();
 	}
-	emit viewToggled(Open);
+	Q_EMIT viewToggled(Open);
 }
 
 
@@ -534,6 +549,7 @@ void CDockWidget::setDockArea(CDockAreaWidget* DockArea)
 {
 	d->DockArea = DockArea;
 	d->ToggleViewAction->setChecked(DockArea != nullptr && !this->isClosed());
+	setParent(DockArea);
 }
 
 
@@ -564,11 +580,11 @@ bool CDockWidget::event(QEvent *e)
 	switch (e->type())
 	{
 	case QEvent::Hide:
-		emit visibilityChanged(false);
+		Q_EMIT visibilityChanged(false);
 		break;
 
 	case QEvent::Show:
-		emit visibilityChanged(geometry().right() >= 0 && geometry().bottom() >= 0);
+		Q_EMIT visibilityChanged(geometry().right() >= 0 && geometry().bottom() >= 0);
         break;
 
 	case QEvent::WindowTitleChange :
@@ -586,7 +602,7 @@ bool CDockWidget::event(QEvent *e)
 			{
 				d->DockArea->markTitleBarMenuOutdated();//update tabs menu
 			}
-			emit titleChanged(title);
+			Q_EMIT titleChanged(title);
 		}
 		break;
 
@@ -769,7 +785,7 @@ void CDockWidget::emitTopLevelChanged(bool Floating)
 	if (Floating != d->IsFloatingTopLevel)
 	{
 		d->IsFloatingTopLevel = Floating;
-		emit topLevelChanged(d->IsFloatingTopLevel);
+		Q_EMIT topLevelChanged(d->IsFloatingTopLevel);
 	}
 }
 
@@ -827,7 +843,7 @@ bool CDockWidget::closeDockWidgetInternal(bool ForceClose)
 {
 	if (!ForceClose)
 	{
-		emit closeRequested();
+		Q_EMIT closeRequested();
 	}
 
 	if (!ForceClose && features().testFlag(CDockWidget::CustomCloseHandling))
@@ -853,7 +869,7 @@ bool CDockWidget::closeDockWidgetInternal(bool ForceClose)
 			}
 		}
 		deleteDockWidget();
-		emit closed();
+		Q_EMIT closed();
     }
     else
     {

src/DockWidget.h

@@ -58,7 +58,7 @@ private:
     DockWidgetPrivate* d; ///< private data (pimpl)
     friend struct DockWidgetPrivate;
 
-private slots:
+private Q_SLOTS:
     /**
      * Adjusts the toolbar icon sizes according to the floating state
      */
@@ -149,11 +149,15 @@ public:
     {
         DockWidgetClosable = 0x01,///< dock widget has a close button
         DockWidgetMovable = 0x02,///< dock widget is movable and can be moved to a new position in the current dock container
-        DockWidgetFloatable = 0x04,
+        DockWidgetFloatable = 0x04,///< dock widget can be dragged into a floating window
         DockWidgetDeleteOnClose = 0x08, ///< deletes the dock widget when it is closed
-        CustomCloseHandling = 0x10,
-        DefaultDockWidgetFeatures = DockWidgetClosable | DockWidgetMovable | DockWidgetFloatable,
+        CustomCloseHandling = 0x10, ///< clicking the close button will not close the dock widget but emits the closeRequested() signal instead
+        DockWidgetFocusable = 0x20, ///< if this is enabled, a dock widget can get focus highlighting
+        DockWidgetForceCloseWithArea = 0x40, ///< dock widget will be closed when the dock area hosting it is closed
+        NoTab = 0x80, ///< dock widget tab will never be shown if this flag is set
+        DefaultDockWidgetFeatures = DockWidgetClosable | DockWidgetMovable | DockWidgetFloatable | DockWidgetFocusable,
         AllDockWidgetFeatures = DefaultDockWidgetFeatures | DockWidgetDeleteOnClose | CustomCloseHandling,
+        DockWidgetAlwaysCloseAndDelete = DockWidgetForceCloseWithArea | DockWidgetDeleteOnClose,
         NoDockWidgetFeatures = 0x00
     };
     Q_DECLARE_FLAGS(DockWidgetFeatures, DockWidgetFeature)
@@ -196,7 +200,7 @@ public:
      * To ensure, that a dock widget does not block resizing, the dock widget
      * reimplements minimumSizeHint() function to return a very small minimum
      * size hint. If you would like to adhere the minimumSizeHint() from the
-     * content widget, the set the minimumSizeHintMode() to
+     * content widget, then set the minimumSizeHintMode() to
      * MinimumSizeHintFromContent.
      */
     enum eMinimumSizeHintMode
@@ -359,6 +363,11 @@ public:
      */
     void setMinimumSizeHintMode(eMinimumSizeHintMode Mode);
 
+    /**
+     * Returns true if the dock widget is set as central widget of it's dock manager
+     */
+    bool isCentralWidget() const;
+
     /**
      * Sets the dock widget icon that is shown in tabs and in toggle view
      * actions
@@ -475,7 +484,7 @@ public: // reimplements QFrame -----------------------------------------------
      */
     virtual bool event(QEvent *e) override;
 
-public slots:
+public Q_SLOTS:
     /**
      * This property controls whether the dock widget is open or closed.
      * The toogleViewAction triggers this slot
@@ -536,7 +545,7 @@ public slots:
     void showNormal();
 
 
-signals:
+Q_SIGNALS:
     /**
      * This signal is emitted if the dock widget is opened or closed
      */
@@ -576,7 +585,7 @@ signals:
      * This signal is emitted when the features property changes.
      * The features parameter gives the new value of the property.
      */
-    void featuresChanged(DockWidgetFeatures features);
+    void featuresChanged(ads::CDockWidget::DockWidgetFeatures features);
 }; // class DockWidget
 }
  // namespace ads

src/DockWidgetTab.cpp

@@ -51,7 +51,6 @@
 #include "DockManager.h"
 #include "IconProvider.h"
 
-#include <iostream>
 
 namespace ads
 {
@@ -77,6 +76,7 @@ struct DockWidgetTabPrivate
 	QAbstractButton* CloseButton = nullptr;
 	QSpacerItem* IconTextSpacer;
 	QPoint TabDragStartPosition;
+	QSize IconSize;
 
 	/**
 	 * Private data constructor
@@ -114,7 +114,7 @@ struct DockWidgetTabPrivate
 	 */
 	bool testConfigFlag(CDockManager::eConfigFlag Flag) const
 	{
-		return CDockManager::configFlags().testFlag(Flag);
+		return CDockManager::testConfigFlag(Flag);
 	}
 
 	/**
@@ -134,6 +134,31 @@ struct DockWidgetTabPrivate
 		}
 	}
 
+	/**
+	 * Update the close button visibility from current feature/config
+	 */
+	void updateCloseButtonVisibility(bool active)
+	{
+		bool DockWidgetClosable = DockWidget->features().testFlag(CDockWidget::DockWidgetClosable);
+		bool ActiveTabHasCloseButton = testConfigFlag(CDockManager::ActiveTabHasCloseButton);
+		bool AllTabsHaveCloseButton = testConfigFlag(CDockManager::AllTabsHaveCloseButton);
+		bool TabHasCloseButton = (ActiveTabHasCloseButton && active) | AllTabsHaveCloseButton;
+		CloseButton->setVisible(DockWidgetClosable && TabHasCloseButton);
+	}
+
+	/**
+	 * Update the size policy of the close button depending on the
+	 * RetainTabSizeWhenCloseButtonHidden feature
+	 */
+	void updateCloseButtonSizePolicy()
+	{
+		auto Features = DockWidget->features();
+		auto SizePolicy = CloseButton->sizePolicy();
+		SizePolicy.setRetainSizeWhenHidden(Features.testFlag(CDockWidget::DockWidgetClosable)
+			&& testConfigFlag(CDockManager::RetainTabSizeWhenCloseButtonHidden));
+		CloseButton->setSizePolicy(SizePolicy);
+	}
+
 	template <typename T>
 	IFloatingWidget* createFloatingWidget(T* Widget, bool OpaqueUndocking)
 	{
@@ -160,6 +185,28 @@ struct DockWidgetTabPrivate
 		GlobalDragStartMousePosition = GlobalPos;
 		DragStartMousePosition = _this->mapFromGlobal(GlobalPos);
 	}
+
+	/**
+	 * Update the icon in case the icon size changed
+	 */
+	void updateIcon()
+	{
+		if (!IconLabel || Icon.isNull())
+		{
+			return;
+		}
+
+		if (IconSize.isValid())
+		{
+			IconLabel->setPixmap(Icon.pixmap(IconSize));
+		}
+		else
+		{
+			IconLabel->setPixmap(Icon.pixmap(_this->style()->pixelMetric(QStyle::PM_SmallIconSize, nullptr, _this)));
+		}
+		IconLabel->setVisible(true);
+	}
+
 };
 // struct DockWidgetTabPrivate
 
@@ -187,7 +234,7 @@ void DockWidgetTabPrivate::createLayout()
 	CloseButton->setObjectName("tabCloseButton");
 	internal::setButtonIcon(CloseButton, QStyle::SP_TitleBarCloseButton, TabCloseIcon);
     CloseButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
-    _this->onDockWidgetFeaturesChanged();
+    updateCloseButtonSizePolicy();
 	internal::setToolTip(CloseButton, QObject::tr("Close Tab"));
 	_this->connect(CloseButton, SIGNAL(clicked()), SIGNAL(closeRequested()));
 
@@ -212,7 +259,7 @@ void DockWidgetTabPrivate::createLayout()
 void DockWidgetTabPrivate::moveTab(QMouseEvent* ev)
 {
     ev->accept();
-    QPoint Distance = ev->globalPos() - GlobalDragStartMousePosition;
+    QPoint Distance = internal::globalPositionOf(ev) - GlobalDragStartMousePosition;
     Distance.setY(0);
     auto TargetPos = Distance + TabDragStartPosition;
     TargetPos.rx() = qMax(TargetPos.x(), 0);
@@ -242,7 +289,7 @@ bool DockWidgetTabPrivate::startFloating(eDragState DraggingState)
     ADS_PRINT("startFloating");
 	DragState = DraggingState;
 	IFloatingWidget* FloatingWidget = nullptr;
-	bool OpaqueUndocking = CDockManager::configFlags().testFlag(CDockManager::OpaqueUndocking) ||
+	bool OpaqueUndocking = CDockManager::testConfigFlag(CDockManager::OpaqueUndocking) ||
 		(DraggingFloatingWidget != DraggingState);
 
 	// If section widget has multiple tabs, we take only one tab
@@ -284,6 +331,10 @@ CDockWidgetTab::CDockWidgetTab(CDockWidget* DockWidget, QWidget *parent) :
 	setAttribute(Qt::WA_NoMousePropagation, true);
 	d->DockWidget = DockWidget;
 	d->createLayout();
+	if (CDockManager::testConfigFlag(CDockManager::FocusHighlighting))
+	{
+		setFocusPolicy(Qt::ClickFocus);
+	}
 }
 
 //============================================================================
@@ -300,9 +351,9 @@ void CDockWidgetTab::mousePressEvent(QMouseEvent* ev)
 	if (ev->button() == Qt::LeftButton)
 	{
 		ev->accept();
-        d->saveDragStartMousePosition(ev->globalPos());
+        d->saveDragStartMousePosition(internal::globalPositionOf(ev));
         d->DragState = DraggingMousePressed;
-        emit clicked();
+        Q_EMIT clicked();
 		return;
 	}
 	Super::mousePressEvent(ev);
@@ -326,7 +377,7 @@ void CDockWidgetTab::mouseReleaseEvent(QMouseEvent* ev)
 			// End of tab moving, emit signal
 			if (d->DockArea)
 			{
-				emit moved(ev->globalPos());
+                Q_EMIT moved(internal::globalPositionOf(ev));
 			}
 			break;
 
@@ -371,7 +422,7 @@ void CDockWidgetTab::mouseMoveEvent(QMouseEvent* ev)
     auto MappedPos = mapToParent(ev->pos());
     bool MouseOutsideBar = (MappedPos.x() < 0) || (MappedPos.x() > parentWidget()->rect().right());
     // Maybe a fixed drag distance is better here ?
-    int DragDistanceY = qAbs(d->GlobalDragStartMousePosition.y() - ev->globalPos().y());
+    int DragDistanceY = qAbs(d->GlobalDragStartMousePosition.y() - internal::globalPositionOf(ev).y());
     if (DragDistanceY >= CDockManager::startDragDistance() || MouseOutsideBar)
 	{
 		// If this is the last dock area in a dock container with only
@@ -394,7 +445,7 @@ void CDockWidgetTab::mouseMoveEvent(QMouseEvent* ev)
         {
         	// If we undock, we need to restore the initial position of this
         	// tab because it looks strange if it remains on its dragged position
-        	if (d->isDraggingState(DraggingTab) && !CDockManager::configFlags().testFlag(CDockManager::OpaqueUndocking))
+        	if (d->isDraggingState(DraggingTab) && !CDockManager::testConfigFlag(CDockManager::OpaqueUndocking))
 			{
         		parentWidget()->layout()->update();
 			}
@@ -403,7 +454,7 @@ void CDockWidgetTab::mouseMoveEvent(QMouseEvent* ev)
     	return;
 	}
     else if (d->DockArea->openDockWidgetsCount() > 1
-     && (ev->globalPos() - d->GlobalDragStartMousePosition).manhattanLength() >= QApplication::startDragDistance()) // Wait a few pixels before start moving
+     && (internal::globalPositionOf(ev) - d->GlobalDragStartMousePosition).manhattanLength() >= QApplication::startDragDistance()) // Wait a few pixels before start moving
 	{
     	// If we start dragging the tab, we save its inital position to
     	// restore it later
@@ -456,25 +507,38 @@ bool CDockWidgetTab::isActiveTab() const
 //============================================================================
 void CDockWidgetTab::setActiveTab(bool active)
 {
-	bool DockWidgetClosable = d->DockWidget->features().testFlag(CDockWidget::DockWidgetClosable);
-	bool ActiveTabHasCloseButton = d->testConfigFlag(CDockManager::ActiveTabHasCloseButton);
-	bool AllTabsHaveCloseButton = d->testConfigFlag(CDockManager::AllTabsHaveCloseButton);
-	bool TabHasCloseButton = (ActiveTabHasCloseButton && active) | AllTabsHaveCloseButton;
-	d->CloseButton->setVisible(DockWidgetClosable && TabHasCloseButton);
-	if (d->IsActiveTab == active)
+    d->updateCloseButtonVisibility(active);
+
+	// Focus related stuff
+	if (CDockManager::testConfigFlag(CDockManager::FocusHighlighting) && !d->DockWidget->dockManager()->isRestoringState())
+	{
+		bool UpdateFocusStyle = false;
+		if (active && !hasFocus())
+		{
+			setFocus(Qt::OtherFocusReason);
+			UpdateFocusStyle = true;
+		}
+
+		if (d->IsActiveTab == active)
+		{
+			if (UpdateFocusStyle)
+			{
+				updateStyle();
+			}
+			return;
+		}
+	}
+	else if (d->IsActiveTab == active)
 	{
 		return;
 	}
 
 	d->IsActiveTab = active;
-	style()->unpolish(this);
-	style()->polish(this);
-	d->TitleLabel->style()->unpolish(d->TitleLabel);
-	d->TitleLabel->style()->polish(d->TitleLabel);
+	updateStyle();
 	update();
 	updateGeometry();
 
-	emit activeTabChanged();
+	Q_EMIT activeTabChanged();
 }
 
 
@@ -527,11 +591,7 @@ void CDockWidgetTab::setIcon(const QIcon& Icon)
 	}
 
 	d->Icon = Icon;
-	if (d->IconLabel)
-	{
-		d->IconLabel->setPixmap(Icon.pixmap(style()->pixelMetric(QStyle::PM_SmallIconSize, nullptr, this)));
-		d->IconLabel->setVisible(true);
-	}
+	d->updateIcon();
 }
 
 
@@ -558,7 +618,7 @@ void CDockWidgetTab::mouseDoubleClickEvent(QMouseEvent *event)
 	if ((!d->DockArea->dockContainer()->isFloating() || d->DockArea->dockWidgetsCount() > 1)
 		&& d->DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable))
 	{
-		d->saveDragStartMousePosition(event->globalPos());
+        d->saveDragStartMousePosition(internal::globalPositionOf(event));
 		d->startFloating(DraggingInactive);
 	}
 
@@ -569,7 +629,7 @@ void CDockWidgetTab::mouseDoubleClickEvent(QMouseEvent *event)
 //============================================================================
 void CDockWidgetTab::setVisible(bool visible)
 {
-	// Just here for debugging to insert debug output
+	visible &= !d->DockWidget->features().testFlag(CDockWidget::NoTab);
     Super::setVisible(visible);
 }
 
@@ -626,11 +686,8 @@ bool CDockWidgetTab::event(QEvent *e)
 //============================================================================
 void CDockWidgetTab::onDockWidgetFeaturesChanged()
 {
-	auto Features = d->DockWidget->features();
-	auto SizePolicy = d->CloseButton->sizePolicy();
-	SizePolicy.setRetainSizeWhenHidden(Features.testFlag(CDockWidget::DockWidgetClosable)
-		&& d->testConfigFlag(CDockManager::RetainTabSizeWhenCloseButtonHidden));
-	d->CloseButton->setSizePolicy(SizePolicy);
+    d->updateCloseButtonSizePolicy();
+    d->updateCloseButtonVisibility(isActiveTab());
 }
 
 
@@ -641,6 +698,28 @@ void CDockWidgetTab::setElideMode(Qt::TextElideMode mode)
 }
 
 
+//============================================================================
+void CDockWidgetTab::updateStyle()
+{
+	internal::repolishStyle(this, internal::RepolishDirectChildren);
+}
+
+
+//============================================================================
+QSize CDockWidgetTab::iconSize() const
+{
+	return d->IconSize;
+}
+
+
+//============================================================================
+void CDockWidgetTab::setIconSize(const QSize& Size)
+{
+	d->IconSize = Size;
+	d->updateIcon();
+}
+
+
 
 
 } // namespace ads

src/DockWidgetTab.h

@@ -31,6 +31,7 @@
 //                                   INCLUDES
 //============================================================================
 #include <QFrame>
+#include <QSize>
 
 #include "ads_globals.h"
 
@@ -39,6 +40,7 @@ namespace ads
 class CDockWidget;
 class CDockAreaWidget;
 struct DockWidgetTabPrivate;
+class CDockManager;
 
 /**
  * A dock widget tab that shows a title and an icon.
@@ -49,14 +51,16 @@ class ADS_EXPORT CDockWidgetTab : public QFrame
 {
 	Q_OBJECT
 	Q_PROPERTY(bool activeTab READ isActiveTab WRITE setActiveTab NOTIFY activeTabChanged)
+	Q_PROPERTY(QSize iconSize READ iconSize WRITE setIconSize)
 
 private:
 	DockWidgetTabPrivate* d; ///< private data (pimpl)
 	friend struct DockWidgetTabPrivate;
 	friend class CDockWidget;
+	friend class CDockManager;
 	void onDockWidgetFeaturesChanged();
 
-private slots:
+private Q_SLOTS:
 	void detachDockWidget();
 
 protected:
@@ -152,11 +156,29 @@ public:
 	 */
 	void setElideMode(Qt::TextElideMode mode);
 
+	/**
+	 * Update stylesheet style if a property changes
+	 */
+	void updateStyle();
 
-public slots:
+	/**
+	 * Returns the icon size.
+	 * If no explicit icon size has been set, the function returns an invalid
+	 * QSize
+	 */
+	QSize iconSize() const;
+
+	/**
+	 * Set an explicit icon size.
+	 * If no icon size has been set explicitely, than the tab sets the icon size
+	 * depending on the style
+	 */
+	void setIconSize(const QSize& Size);
+
+public Q_SLOTS:
 	virtual void setVisible(bool visible) override;
 
-signals:
+Q_SIGNALS:
 	void activeTabChanged();
 	void clicked();
 	void closeRequested();

src/ElidingLabel.cpp

@@ -74,7 +74,7 @@ void ElidingLabelPrivate::elideText(int Width)
     IsElided = str != Text;
     if(IsElided != WasElided)
     {
-        emit _this->elidedChanged(IsElided);
+        Q_EMIT _this->elidedChanged(IsElided);
     }
     _this->QLabel::setText(str);
 }
@@ -136,7 +136,7 @@ void CElidingLabel::mouseReleaseEvent(QMouseEvent* event)
 		return;
 	}
 
-	emit clicked();
+	Q_EMIT clicked();
 }
 
 
@@ -144,7 +144,7 @@ void CElidingLabel::mouseReleaseEvent(QMouseEvent* event)
 void CElidingLabel::mouseDoubleClickEvent( QMouseEvent *ev )
 {
 	Q_UNUSED(ev)
-	emit doubleClicked();
+	Q_EMIT doubleClicked();
 	Super::mouseDoubleClickEvent(ev);
 }
 
@@ -163,7 +163,12 @@ void CElidingLabel::resizeEvent(QResizeEvent *event)
 //============================================================================
 QSize CElidingLabel::minimumSizeHint() const
 {
-    if (pixmap() != nullptr || d->isModeElideNone())
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    bool HasPixmap = !pixmap().isNull();
+#else
+    bool HasPixmap = (pixmap() != nullptr);
+#endif
+    if (HasPixmap || d->isModeElideNone())
     {
         return QLabel::minimumSizeHint();
     }
@@ -180,7 +185,12 @@ QSize CElidingLabel::minimumSizeHint() const
 //============================================================================
 QSize CElidingLabel::sizeHint() const
 {
-    if (pixmap() != nullptr || d->isModeElideNone())
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    bool HasPixmap = !pixmap().isNull();
+#else
+    bool HasPixmap = (pixmap() != nullptr);
+#endif
+    if (HasPixmap || d->isModeElideNone())
     {
         return QLabel::sizeHint();
     }

src/ElidingLabel.h

@@ -58,8 +58,8 @@ protected:
 public:
     using Super = QLabel;
 
-	CElidingLabel(QWidget* parent = 0, Qt::WindowFlags f = 0);
-	CElidingLabel(const QString& text, QWidget* parent = 0, Qt::WindowFlags f = 0);
+    CElidingLabel(QWidget* parent = 0, Qt::WindowFlags f = Qt::WindowFlags ());
+    CElidingLabel(const QString& text, QWidget* parent = 0, Qt::WindowFlags f = Qt::WindowFlags ());
 	virtual ~CElidingLabel();
 
 	/**
@@ -84,7 +84,7 @@ public: // reimplements QLabel ----------------------------------------------
 	void setText(const QString &text);
 	QString text() const;
 
-signals:
+Q_SIGNALS:
 	/**
 	 * This signal is emitted if the user clicks on the label (i.e. pressed
 	 * down then released while the mouse cursor is inside the label)

src/FloatingDockContainer.cpp

@@ -376,6 +376,7 @@ struct FloatingDockContainerPrivate
 #ifdef Q_OS_LINUX
     QWidget* MouseEventHandler = nullptr;
     CFloatingWidgetTitleBar* TitleBar = nullptr;
+	bool IsResizing = false;
 #endif
 
 	/**
@@ -391,7 +392,7 @@ struct FloatingDockContainerPrivate
 	 */
 	static bool testConfigFlag(CDockManager::eConfigFlag Flag)
 	{
-		return CDockManager::configFlags().testFlag(Flag);
+		return CDockManager::testConfigFlag(Flag);
 	}
 
 	/**
@@ -410,10 +411,12 @@ struct FloatingDockContainerPrivate
 	void setWindowTitle(const QString &Text)
 	{
 #ifdef Q_OS_LINUX
-        TitleBar->setTitle(Text);
-#else
-		_this->setWindowTitle(Text);
+		if (TitleBar)
+		{
+			TitleBar->setTitle(Text);
+		}
 #endif
+		_this->setWindowTitle(Text);
 	}
 
 	/**
@@ -604,13 +607,53 @@ CFloatingDockContainer::CFloatingDockContainer(CDockManager *DockManager) :
 	    SLOT(onDockAreasAddedOrRemoved()));
 
 #ifdef Q_OS_LINUX
-    d->TitleBar = new CFloatingWidgetTitleBar(this);
-    setWindowFlags(windowFlags() | Qt::Tool);
-    QDockWidget::setWidget(d->DockContainer);
-    QDockWidget::setFloating(true);
-    QDockWidget::setFeatures(QDockWidget::AllDockWidgetFeatures);
-    setTitleBarWidget(d->TitleBar);
-    connect(d->TitleBar, SIGNAL(closeRequested()), SLOT(close()));
+	QDockWidget::setWidget(d->DockContainer);
+	QDockWidget::setFloating(true);
+	QDockWidget::setFeatures(QDockWidget::DockWidgetClosable
+		| QDockWidget::DockWidgetMovable | QDockWidget::DockWidgetFloatable);
+
+	bool native_window = true;
+
+	// FloatingContainerForce*TitleBar is overwritten by the "ADS_UseNativeTitle" environment variable if set.
+	auto env = qgetenv("ADS_UseNativeTitle").toUpper();
+	if (env == "1")
+	{
+		native_window = true;
+	}
+	else if (env == "0")
+	{
+		native_window = false;
+	}
+	else if (DockManager->testConfigFlag(CDockManager::FloatingContainerForceNativeTitleBar))
+	{
+		native_window = true;
+	}
+	else if (DockManager->testConfigFlag(CDockManager::FloatingContainerForceQWidgetTitleBar))
+	{
+		native_window = false;
+	}
+	else
+	{
+		// KDE doesn't seem to fire MoveEvents while moving windows, so for now no native titlebar for everything using KWin.
+		QString window_manager = internal::windowManager().toUpper().split(" ")[0];
+                native_window = window_manager != "KWIN";
+	}
+
+	if (native_window)
+	{
+		setTitleBarWidget(new QWidget());
+		setWindowFlags(Qt::Window | Qt::WindowMaximizeButtonHint | Qt::CustomizeWindowHint | Qt::WindowCloseButtonHint);
+	}
+	else
+	{
+		d->TitleBar = new CFloatingWidgetTitleBar(this);
+		setTitleBarWidget(d->TitleBar);
+		setWindowFlags(Qt::Window | Qt::WindowMinMaxButtonsHint | Qt::FramelessWindowHint);
+		d->TitleBar->enableCloseButton(isClosable());
+		connect(d->TitleBar, SIGNAL(closeRequested()), SLOT(close()));
+		connect(d->TitleBar, &CFloatingWidgetTitleBar::maximizeRequested,
+				this, &CFloatingDockContainer::onMaximizeRequest);
+	}
 #else
 	setWindowFlags(
 	    Qt::Window | Qt::WindowMaximizeButtonHint | Qt::WindowCloseButtonHint);
@@ -629,14 +672,14 @@ CFloatingDockContainer::CFloatingDockContainer(CDockAreaWidget *DockArea) :
 	CFloatingDockContainer(DockArea->dockManager())
 {
 	d->DockContainer->addDockArea(DockArea);
-#ifdef Q_OS_LINUX
-    d->TitleBar->enableCloseButton(isClosable());
-#endif
+
     auto TopLevelDockWidget = topLevelDockWidget();
     if (TopLevelDockWidget)
     {
     	TopLevelDockWidget->emitTopLevelChanged(true);
     }
+
+    d->DockManager->notifyWidgetOrAreaRelocation(DockArea);
 }
 
 //============================================================================
@@ -644,14 +687,13 @@ CFloatingDockContainer::CFloatingDockContainer(CDockWidget *DockWidget) :
 	CFloatingDockContainer(DockWidget->dockManager())
 {
 	d->DockContainer->addDockWidget(CenterDockWidgetArea, DockWidget);
-#ifdef Q_OS_LINUX
-    d->TitleBar->enableCloseButton(isClosable());
-#endif
     auto TopLevelDockWidget = topLevelDockWidget();
     if (TopLevelDockWidget)
     {
     	TopLevelDockWidget->emitTopLevelChanged(true);
     }
+
+    d->DockManager->notifyWidgetOrAreaRelocation(DockWidget);
 }
 
 //============================================================================
@@ -674,19 +716,29 @@ CDockContainerWidget* CFloatingDockContainer::dockContainer() const
 //============================================================================
 void CFloatingDockContainer::changeEvent(QEvent *event)
 {
-	QWidget::changeEvent(event);
+	Super::changeEvent(event);
 	if ((event->type() == QEvent::ActivationChange) && isActiveWindow())
 	{
 		ADS_PRINT("FloatingWidget::changeEvent QEvent::ActivationChange ");
 		d->zOrderIndex = ++zOrderCounter;
-		return;
+
+#ifdef Q_OS_LINUX
+		if (d->DraggingState == DraggingFloatingWidget)
+		{
+			d->titleMouseReleaseEvent();
+			d->DraggingState = DraggingInactive;
+		}
+#endif
 	}
 }
 
 
 #ifdef Q_OS_WIN
-//============================================================================
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 bool CFloatingDockContainer::nativeEvent(const QByteArray &eventType, void *message, long *result)
+#else
+bool CFloatingDockContainer::nativeEvent(const QByteArray &eventType, void *message, qintptr *result)
+#endif
 {
 	QWidget::nativeEvent(eventType, message, result);
 	MSG *msg = static_cast<MSG*>(message);
@@ -704,7 +756,7 @@ bool CFloatingDockContainer::nativeEvent(const QByteArray &eventType, void *mess
 		case WM_NCLBUTTONDOWN:
 			 if (msg->wParam == HTCAPTION && d->isState(DraggingInactive))
 			 {
-				ADS_PRINT("CFloatingDockContainer::nativeEvent WM_NCLBUTTONDOWN" << e->type());
+				ADS_PRINT("CFloatingDockContainer::nativeEvent WM_NCLBUTTONDOWN");
 				d->DragStartPos = pos();
 				d->setState(DraggingMousePressed);
 			 }
@@ -717,7 +769,7 @@ bool CFloatingDockContainer::nativeEvent(const QByteArray &eventType, void *mess
 		case WM_ENTERSIZEMOVE:
 			 if (d->isState(DraggingMousePressed))
 			 {
-				ADS_PRINT("CFloatingDockContainer::nativeEvent WM_ENTERSIZEMOVE" << e->type());
+				ADS_PRINT("CFloatingDockContainer::nativeEvent WM_ENTERSIZEMOVE");
 				d->setState(DraggingFloatingWidget);
 				d->updateDropOverlays(QCursor::pos());
 			 }
@@ -726,7 +778,7 @@ bool CFloatingDockContainer::nativeEvent(const QByteArray &eventType, void *mess
 		case WM_EXITSIZEMOVE:
 			 if (d->isState(DraggingFloatingWidget))
 			 {
-				ADS_PRINT("CFloatingDockContainer::nativeEvent WM_EXITSIZEMOVE" << e->type());
+				ADS_PRINT("CFloatingDockContainer::nativeEvent WM_EXITSIZEMOVE");
 				if (GetAsyncKeyState(VK_ESCAPE) & 0x8000)
 				{
 					d->handleEscapeKey();
@@ -800,10 +852,17 @@ void CFloatingDockContainer::hideEvent(QHideEvent *event)
 	d->Hiding = false;
 }
 
+
 //============================================================================
 void CFloatingDockContainer::showEvent(QShowEvent *event)
 {
 	Super::showEvent(event);
+#ifdef Q_OS_LINUX
+    if (CDockManager::testConfigFlag(CDockManager::FocusHighlighting))
+    {
+        this->window()->activateWindow();
+    }
+#endif
 }
 
 
@@ -811,25 +870,35 @@ void CFloatingDockContainer::showEvent(QShowEvent *event)
 void CFloatingDockContainer::startFloating(const QPoint &DragStartMousePos,
     const QSize &Size, eDragState DragState, QWidget *MouseEventHandler)
 {
-#ifndef Q_OS_LINUX
-	Q_UNUSED(MouseEventHandler)
-#endif
-	resize(Size);
-	d->setState(DragState);
-	d->DragStartMousePosition = DragStartMousePos;
 #ifdef Q_OS_LINUX
+    if (!isMaximized())
+    {
+		resize(Size);
+		d->DragStartMousePosition = DragStartMousePos;
+    }
+	d->setState(DragState);
 	if (DraggingFloatingWidget == DragState)
 	{
-        setAttribute(Qt::WA_X11NetWmWindowTypeDock, true);
 		d->MouseEventHandler = MouseEventHandler;
 		if (d->MouseEventHandler)
 		{
 			d->MouseEventHandler->grabMouse();
 		}
 	}
-#endif
+
+	if (!isMaximized())
+	{
+		moveFloating();
+	}
+	show();
+#else
+    Q_UNUSED(MouseEventHandler)
+	resize(Size);
+	d->DragStartMousePosition = DragStartMousePos;
+	d->setState(DragState);
 	moveFloating();
 	show();
+#endif
 }
 
 //============================================================================
@@ -839,7 +908,6 @@ void CFloatingDockContainer::moveFloating()
 	const QPoint moveToPos = QCursor::pos() - d->DragStartMousePosition
 	    - QPoint(BorderSize, 0);
 	move(moveToPos);
-
 	switch (d->DraggingState)
 	{
 	case DraggingMousePressed:
@@ -938,11 +1006,17 @@ bool CFloatingDockContainer::restoreState(CDockingStateReader &Stream,
 	{
 		return false;
 	}
-
 	onDockAreasAddedOrRemoved();
+#ifdef Q_OS_LINUX
+	if(d->TitleBar)
+	{
+		d->TitleBar->setMaximizedIcon(windowState() == Qt::WindowMaximized);
+	}
+#endif
 	return true;
 }
 
+
 //============================================================================
 bool CFloatingDockContainer::hasTopLevelDockWidget() const
 {
@@ -966,18 +1040,210 @@ void CFloatingDockContainer::finishDragging()
 {
 	ADS_PRINT("CFloatingDockContainer::finishDragging");
 #ifdef Q_OS_LINUX
-   setAttribute(Qt::WA_X11NetWmWindowTypeDock, false);
-   setWindowOpacity(1);
-   activateWindow();
-   if (d->MouseEventHandler)
-   {
-       d->MouseEventHandler->releaseMouse();
-       d->MouseEventHandler = nullptr;
-   }
+	setWindowOpacity(1);
+	activateWindow();
+	if (d->MouseEventHandler)
+	{
+	   d->MouseEventHandler->releaseMouse();
+	   d->MouseEventHandler = nullptr;
+	}
 #endif
-   d->titleMouseReleaseEvent();
+	d->titleMouseReleaseEvent();
 }
 
+#ifdef Q_OS_MACOS
+//============================================================================
+bool CFloatingDockContainer::event(QEvent *e)
+{
+	switch (d->DraggingState)
+	{
+	case DraggingInactive:
+	{
+		// Normally we would check here, if the left mouse button is pressed.
+		// But from QT version 5.12.2 on the mouse events from
+		// QEvent::NonClientAreaMouseButtonPress return the wrong mouse button
+		// The event always returns Qt::RightButton even if the left button
+		// is clicked.
+		// It is really great to work around the whole NonClientMouseArea
+		// bugs
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 12, 2))
+		if (e->type() == QEvent::NonClientAreaMouseButtonPress /*&& QGuiApplication::mouseButtons().testFlag(Qt::LeftButton)*/)
+#else
+		if (e->type() == QEvent::NonClientAreaMouseButtonPress && QGuiApplication::mouseButtons().testFlag(Qt::LeftButton))
+#endif
+		{
+			ADS_PRINT("FloatingWidget::event Event::NonClientAreaMouseButtonPress" << e->type());
+			d->DragStartPos = pos();
+			d->setState(DraggingMousePressed);
+		}
+	}
+	break;
+
+	case DraggingMousePressed:
+		switch (e->type())
+		{
+		case QEvent::NonClientAreaMouseButtonDblClick:
+			ADS_PRINT("FloatingWidget::event QEvent::NonClientAreaMouseButtonDblClick");
+			d->setState(DraggingInactive);
+			break;
+
+		case QEvent::Resize:
+			// If the first event after the mouse press is a resize event, then
+			// the user resizes the window instead of dragging it around.
+			// But there is one exception. If the window is maximized,
+			// then dragging the window via title bar will cause the widget to
+			// leave the maximized state. This in turn will trigger a resize event.
+			// To know, if the resize event was triggered by user via moving a
+			// corner of the window frame or if it was caused by a windows state
+			// change, we check, if we are not in maximized state.
+			if (!isMaximized())
+			{
+				d->setState(DraggingInactive);
+			}
+			break;
+
+		default:
+			break;
+		}
+		break;
+
+	case DraggingFloatingWidget:
+		if (e->type() == QEvent::NonClientAreaMouseButtonRelease)
+		{
+			ADS_PRINT("FloatingWidget::event QEvent::NonClientAreaMouseButtonRelease");
+			d->titleMouseReleaseEvent();
+		}
+		break;
+
+	default:
+		break;
+	}
+
+#if (ADS_DEBUG_LEVEL > 0)
+	qDebug() << QTime::currentTime() << "CFloatingDockContainer::event " << e->type();
+#endif
+	return QWidget::event(e);
+}
+
+
+//============================================================================
+void CFloatingDockContainer::moveEvent(QMoveEvent *event)
+{
+	QWidget::moveEvent(event);
+	switch (d->DraggingState)
+	{
+	case DraggingMousePressed:
+		d->setState(DraggingFloatingWidget);
+		d->updateDropOverlays(QCursor::pos());
+		break;
+
+	case DraggingFloatingWidget:
+		d->updateDropOverlays(QCursor::pos());
+		// In OSX when hiding the DockAreaOverlay the application would set
+		// the main window as the active window for some reason. This fixes
+		// that by resetting the active window to the floating widget after
+		// updating the overlays.
+		QApplication::setActiveWindow(this);
+		break;
+	default:
+		break;
+	}
+
+
+}
+#endif
+
+
+#ifdef Q_OS_LINUX
+//============================================================================
+void CFloatingDockContainer::onMaximizeRequest()
+{
+	if (windowState() == Qt::WindowMaximized)
+	{
+		showNormal();
+	}
+	else
+	{
+		showMaximized();
+	}
+}
+
+
+//============================================================================
+void CFloatingDockContainer::showNormal(bool fixGeometry)
+{
+	if (windowState() == Qt::WindowMaximized)
+	{
+		QRect oldNormal = normalGeometry();
+		Super::showNormal();
+		if(fixGeometry)
+		{
+			setGeometry(oldNormal);
+		}
+	}
+	if(d->TitleBar)
+	{
+		d->TitleBar->setMaximizedIcon(false);
+	}
+}
+
+
+//============================================================================
+void CFloatingDockContainer::showMaximized()
+{
+	Super::showMaximized();
+	if (d->TitleBar)
+	{
+		d->TitleBar->setMaximizedIcon(true);
+	}
+}
+
+
+//============================================================================
+bool CFloatingDockContainer::isMaximized() const
+{
+	return windowState() == Qt::WindowMaximized;
+}
+
+
+//============================================================================
+void CFloatingDockContainer::show()
+{
+	// Prevent this window from showing in the taskbar and pager (alt+tab)
+	internal::xcb_add_prop(true, winId(), "_NET_WM_STATE", "_NET_WM_STATE_SKIP_TASKBAR");
+	internal::xcb_add_prop(true, winId(), "_NET_WM_STATE", "_NET_WM_STATE_SKIP_PAGER");
+	Super::show();
+}
+
+
+//============================================================================
+void CFloatingDockContainer::resizeEvent(QResizeEvent *event)
+{
+	d->IsResizing = true;
+	Super::resizeEvent(event);
+}
+
+
+//============================================================================
+void CFloatingDockContainer::moveEvent(QMoveEvent *event)
+{
+	Super::moveEvent(event);
+	if (!d->IsResizing && event->spontaneous())
+	{
+		d->DraggingState = DraggingFloatingWidget;
+		d->updateDropOverlays(QCursor::pos());
+	}
+	d->IsResizing = false;
+}
+
+
+//============================================================================
+bool CFloatingDockContainer::hasNativeTitleBar()
+{
+	return d->TitleBar == nullptr;
+}
+#endif
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/FloatingDockContainer.h

@@ -118,7 +118,7 @@ private:
 	friend class CDockAreaWidget;
     friend class CFloatingWidgetTitleBar;
 
-private slots:
+private Q_SLOTS:
 	void onDockAreasAddedOrRemoved();
 	void onDockAreaCurrentChanged(int Index);
 
@@ -172,8 +172,7 @@ protected:
 	/**
 	 * Call this function to update the window title
 	 */
-	void updateWindowTitle();
-
+    void updateWindowTitle();
 
 protected: // reimplements QWidget
 	virtual void changeEvent(QEvent *event) override;
@@ -181,16 +180,30 @@ protected: // reimplements QWidget
 	virtual void hideEvent(QHideEvent *event) override;
 	virtual void showEvent(QShowEvent *event) override;
 
+#ifdef Q_OS_MACOS
+	virtual bool event(QEvent *e) override;
+	virtual void moveEvent(QMoveEvent *event) override;
+#endif
+
+#ifdef Q_OS_LINUX
+	virtual void moveEvent(QMoveEvent *event) override;
+	virtual void resizeEvent(QResizeEvent *event) override;
+#endif
+
 #ifdef Q_OS_WIN
 	/**
 	 * Native event filter for handling WM_MOVING messages on Windows
 	 */
-	virtual bool nativeEvent(const QByteArray &eventType, void *message, long *result) override;
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
+    virtual bool nativeEvent(const QByteArray &eventType, void *message, long *result) override;
+#else
+    virtual bool nativeEvent(const QByteArray &eventType, void *message, qintptr *result) override;
+#endif
 #endif
 
 
 public:
-	using Super = QWidget;
+	using Super = tFloatingWidgetBase;
 
 	/**
 	 * Create empty floating widget - required for restore state
@@ -244,6 +257,44 @@ public:
      * function of the internal container widget.
      */
     QList<CDockWidget*> dockWidgets() const;
+
+#ifdef Q_OS_LINUX
+    /**
+	 * This is a function that responds to FloatingWidgetTitleBar::maximizeRequest()
+	 * Maximize or normalize the container size.
+     */
+    void onMaximizeRequest();
+
+	/**
+	 * Normalize (Unmaximize) the window.
+	 *	fixGeometry parameter fixes a "bug" in QT where immediately after calling showNormal
+	 *	geometry is not set properly.
+	 *	Set this true when moving the window immediately after normalizing.
+	 */
+	void showNormal(bool fixGeometry=false);
+
+	/**
+	 * Maximizes the window.
+	 */
+	void showMaximized();
+
+	/**
+	 * Returns if the window is currently maximized or not.
+	 */
+	bool isMaximized() const;
+
+	/**
+	 * Patched show to prevent the window from appearing in the taskbar.
+	 */
+	void show();
+
+	/**
+	 * Returns true if the floating widget has a native titlebar or false if
+	 * the floating widget has a QWidget based title bar
+	 */
+	bool hasNativeTitleBar();
+#endif
+
 }; // class FloatingDockContainer
 }
  // namespace ads

src/FloatingDragPreview.cpp

@@ -60,7 +60,7 @@ struct FloatingDragPreviewPrivate
 	void cancelDragging()
 	{
 		Canceled = true;
-		emit _this->draggingCanceled();
+		Q_EMIT _this->draggingCanceled();
 		DockManager->containerOverlay()->hideOverlay();
 		DockManager->dockAreaOverlay()->hideOverlay();
 		_this->close();
@@ -112,7 +112,7 @@ void FloatingDragPreviewPrivate::updateDropOverlays(const QPoint &GlobalPos)
 	{
 		ContainerOverlay->hideOverlay();
 		DockAreaOverlay->hideOverlay();
-		if (CDockManager::configFlags().testFlag(CDockManager::DragPreviewIsDynamic))
+		if (CDockManager::testConfigFlag(CDockManager::DragPreviewIsDynamic))
 		{
 			setHidden(false);
 		}
@@ -151,7 +151,7 @@ void FloatingDragPreviewPrivate::updateDropOverlays(const QPoint &GlobalPos)
 		// If there is only one single visible dock area in a container, then
 		// it does not make sense to show a dock overlay because the dock area
 		// would be removed and inserted at the same position
-		if (VisibleDockAreas <= 1)
+		if (VisibleDockAreas == 1)
 		{
 			ContainerOverlay->hideOverlay();
 		}
@@ -167,7 +167,7 @@ void FloatingDragPreviewPrivate::updateDropOverlays(const QPoint &GlobalPos)
 		}
 	}
 
-	if (CDockManager::configFlags().testFlag(CDockManager::DragPreviewIsDynamic))
+	if (CDockManager::testConfigFlag(CDockManager::DragPreviewIsDynamic))
 	{
 		setHidden(DockDropArea != InvalidDockWidgetArea || ContainerDropArea != InvalidDockWidgetArea);
 	}
@@ -203,7 +203,7 @@ void FloatingDragPreviewPrivate::createFloatingWidget()
 	{
 		FloatingWidget->setGeometry(_this->geometry());
 		FloatingWidget->show();
-		if (!CDockManager::configFlags().testFlag(CDockManager::DragPreviewHasWindowFrame))
+		if (!CDockManager::testConfigFlag(CDockManager::DragPreviewHasWindowFrame))
 		{
 			QApplication::processEvents();
 			int FrameHeight = FloatingWidget->frameGeometry().height() - FloatingWidget->geometry().height();
@@ -222,7 +222,7 @@ CFloatingDragPreview::CFloatingDragPreview(QWidget* Content, QWidget* parent) :
 {
 	d->Content = Content;
 	setAttribute(Qt::WA_DeleteOnClose);
-	if (CDockManager::configFlags().testFlag(CDockManager::DragPreviewHasWindowFrame))
+	if (CDockManager::testConfigFlag(CDockManager::DragPreviewHasWindowFrame))
 	{
 		setWindowFlags(
 			Qt::Window | Qt::WindowMaximizeButtonHint | Qt::WindowCloseButtonHint);
@@ -245,7 +245,7 @@ CFloatingDragPreview::CFloatingDragPreview(QWidget* Content, QWidget* parent) :
 	// Create a static image of the widget that should get undocked
 	// This is like some kind preview image like it is uses in drag and drop
 	// operations
-	if (CDockManager::configFlags().testFlag(CDockManager::DragPreviewShowsContentPixmap))
+	if (CDockManager::testConfigFlag(CDockManager::DragPreviewShowsContentPixmap))
 	{
 		d->ContentPreviewPixmap = QPixmap(Content->size());
 		Content->render(&d->ContentPreviewPixmap);
@@ -363,14 +363,14 @@ void CFloatingDragPreview::paintEvent(QPaintEvent* event)
 	}
 
 	QPainter painter(this);
-	if (CDockManager::configFlags().testFlag(CDockManager::DragPreviewShowsContentPixmap))
+	if (CDockManager::testConfigFlag(CDockManager::DragPreviewShowsContentPixmap))
 	{
 		painter.drawPixmap(QPoint(0, 0), d->ContentPreviewPixmap);
 	}
 
 	// If we do not have a window frame then we paint a QRubberBand like
 	// frameless window
-	if (!CDockManager::configFlags().testFlag(CDockManager::DragPreviewHasWindowFrame))
+	if (!CDockManager::testConfigFlag(CDockManager::DragPreviewHasWindowFrame))
 	{
 		QColor Color = palette().color(QPalette::Active, QPalette::Highlight);
 		QPen Pen = painter.pen();

src/FloatingDragPreview.h

@@ -32,7 +32,7 @@ private:
 	FloatingDragPreviewPrivate* d;
 	friend struct FloatingDragPreviewPrivate;
 
-private slots:
+private Q_SLOTS:
 	/**
 	 * Cancel non opaque undocking if application becomes inactive
 	 */
@@ -92,7 +92,7 @@ public: // implements IFloatingWidget -----------------------------------------
 	 */
 	virtual void finishDragging() override;
 
-signals:
+Q_SIGNALS:
 	/**
 	 * This signal is emitted, if dragging has been canceled by escape key
 	 * or by active application switching via task manager

src/ads.qrc

@@ -4,5 +4,15 @@
         <file>images/close-button.svg</file>
         <file>images/close-button-disabled.svg</file>
         <file>stylesheets/default_linux.css</file>
+        <file>images/close-button-focused.svg</file>
+        <file>stylesheets/focus_highlighting.css</file>
+        <file>stylesheets/focus_highlighting_linux.css</file>
+        <file>images/tabs-menu-button.svg</file>
+        <file>images/detach-button.svg</file>
+        <file>images/detach-button-disabled.svg</file>
+        <file>images/maximize-button.svg</file>
+        <file>images/maximize-button-focused.svg</file>
+        <file>images/restore-button.svg</file>
+        <file>images/restore-button-focused.svg</file>
     </qresource>
 </RCC>

src/ads_globals.cpp

@@ -31,18 +31,262 @@
 #include <QVariant>
 #include <QPainter>
 #include <QAbstractButton>
+#include <QStyle>
 
 #include "DockSplitter.h"
 #include "DockManager.h"
 #include "IconProvider.h"
 #include "ads_globals.h"
 
+#ifdef Q_OS_LINUX
+#include <QX11Info>
+#include <QSettings>
+#include <QFile>
+#endif
+
+
+#include <QApplication>
 
 namespace ads
 {
 
 namespace internal
 {
+#ifdef Q_OS_LINUX
+static QString _window_manager;
+static QHash<QString, xcb_atom_t> _xcb_atom_cache;
+
+
+//============================================================================
+xcb_atom_t xcb_get_atom(const char *name)
+{
+	if (!QX11Info::isPlatformX11())
+	{
+		return XCB_ATOM_NONE;
+	}
+	auto key = QString(name);
+	if(_xcb_atom_cache.contains(key))
+	{
+		return _xcb_atom_cache[key];
+	}
+	xcb_connection_t *connection = QX11Info::connection();
+	xcb_intern_atom_cookie_t request = xcb_intern_atom(connection, 1, strlen(name), name);
+	xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(connection, request, NULL);
+	if (!reply)
+	{
+		return XCB_ATOM_NONE;
+	}
+	xcb_atom_t atom = reply->atom;
+	if(atom == XCB_ATOM_NONE)
+	{
+		ADS_PRINT("Unknown Atom response from XServer: " << name);
+	}
+	else
+	{
+		_xcb_atom_cache.insert(key, atom);
+	}
+	free(reply);
+	return atom;
+}
+
+
+//============================================================================
+void xcb_update_prop(bool set, WId window, const char *type, const char *prop, const char *prop2)
+{
+	auto connection = QX11Info::connection();
+	xcb_atom_t type_atom = xcb_get_atom(type);
+	xcb_atom_t prop_atom = xcb_get_atom(prop);
+	xcb_client_message_event_t event;
+	event.response_type = XCB_CLIENT_MESSAGE;
+	event.format = 32;
+	event.sequence = 0;
+	event.window = window;
+	event.type = type_atom;
+	event.data.data32[0] = set ? 1 : 0;
+	event.data.data32[1] = prop_atom;
+	event.data.data32[2] = prop2 ? xcb_get_atom(prop2) : 0;
+	event.data.data32[3] = 0;
+	event.data.data32[4] = 0;
+
+	xcb_send_event(connection, 0, window,
+				   XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT | XCB_EVENT_MASK_PROPERTY_CHANGE,
+				   (const char *)&event);
+	xcb_flush(connection);
+}
+
+
+//============================================================================
+xcb_get_property_reply_t* _xcb_get_props(WId window, const char *type, unsigned int atom_type)
+{
+	if (!QX11Info::isPlatformX11())
+	{
+		return nullptr;
+	}
+	xcb_connection_t *connection = QX11Info::connection();
+	xcb_atom_t type_atom = xcb_get_atom(type);
+	if (type_atom == XCB_ATOM_NONE)
+	{
+		return nullptr;
+	}
+	xcb_get_property_cookie_t request = xcb_get_property_unchecked(connection, 0, window, type_atom, atom_type, 0, 1024);
+	xcb_get_property_reply_t *reply = xcb_get_property_reply(connection, request, nullptr);
+	if(reply && reply->type != atom_type)
+	{
+		ADS_PRINT("ATOM TYPE MISMATCH (" << type <<"). Expected: " << atom_type << "  but got " << reply->type);
+		free(reply);
+		return nullptr;
+	}
+	return reply;
+}
+
+
+//============================================================================
+template <typename T>
+void xcb_get_prop_list(WId window, const char *type, QVector<T> &ret, unsigned int atom_type)
+{
+	xcb_get_property_reply_t *reply = _xcb_get_props(window, type, atom_type);
+	if (reply && reply->format == 32 && reply->type == atom_type && reply->value_len > 0)
+	{
+		const xcb_atom_t *data = static_cast<const T *>(xcb_get_property_value(reply));
+		ret.resize(reply->value_len);
+		memcpy((void *)&ret.first(), (void *)data, reply->value_len * sizeof(T));
+	}
+	free(reply);
+}
+
+
+//============================================================================
+QString xcb_get_prop_string(WId window, const char *type)
+{
+	QString ret;
+	// try utf8 first
+	xcb_atom_t utf_atom = xcb_get_atom("UTF8_STRING");
+	if(utf_atom != XCB_ATOM_NONE)
+	{
+		xcb_get_property_reply_t *reply = _xcb_get_props(window, type, utf_atom);
+		if (reply && reply->format == 8 && reply->type == utf_atom)
+		{
+			const char *value = reinterpret_cast<const char *>(xcb_get_property_value(reply));
+			ret = QString::fromUtf8(value, xcb_get_property_value_length(reply));
+			free(reply);
+			return ret;
+		}
+		free(reply);
+	}
+	// Fall back to XCB_ATOM_STRING
+	xcb_get_property_reply_t *reply = _xcb_get_props(window, type, XCB_ATOM_STRING);
+	if (reply && reply->format == 8 && reply->type == XCB_ATOM_STRING)
+	{
+		const char *value = reinterpret_cast<const char *>(xcb_get_property_value(reply));
+		ret = QString::fromLatin1(value, xcb_get_property_value_length(reply));
+	}
+	free(reply);
+	return ret;
+}
+
+
+//============================================================================
+bool xcb_dump_props(WId window, const char *type)
+{
+	QVector<xcb_atom_t> atoms;
+	xcb_get_prop_list(window, type, atoms, XCB_ATOM_ATOM);
+	qDebug() << "\n\n!!!" << type << "  -  " << atoms.length();
+	xcb_connection_t *connection = QX11Info::connection();
+	for (auto atom : atoms)
+	{
+		auto foo = xcb_get_atom_name(connection, atom);
+		auto bar = xcb_get_atom_name_reply(connection, foo, nullptr);
+		qDebug() << "\t" << xcb_get_atom_name_name(bar);
+		free(bar);
+	}
+	return true;
+}
+
+
+//============================================================================
+void xcb_add_prop(bool state, WId window, const char *type, const char *prop)
+{
+	if (!QX11Info::isPlatformX11())
+	{
+		return;
+	}
+	xcb_atom_t prop_atom = xcb_get_atom(prop);
+	xcb_atom_t type_atom = xcb_get_atom(type);
+	if (prop_atom == XCB_ATOM_NONE || type_atom == XCB_ATOM_NONE)
+	{
+		return;
+	}
+	QVector<xcb_atom_t> atoms;
+	xcb_get_prop_list(window, type, atoms, XCB_ATOM_ATOM);
+	int index = atoms.indexOf(prop_atom);
+	if (state && index == -1)
+	{
+		atoms.push_back(prop_atom);
+	}
+	else if (!state && index >= 0)
+	{
+		atoms.remove(index);
+	}
+	xcb_connection_t *connection = QX11Info::connection();
+	xcb_change_property(connection, XCB_PROP_MODE_REPLACE, window, type_atom, XCB_ATOM_ATOM, 32, atoms.count(), atoms.constData());
+	xcb_flush(connection);
+}
+
+
+//============================================================================
+QString detectWindowManagerX11()
+{
+	// Tries to detect the windowmanager via X11.
+	// See: https://specifications.freedesktop.org/wm-spec/1.3/ar01s03.html#idm46018259946000
+	if (!QX11Info::isPlatformX11())
+	{
+		return "UNKNOWN";
+	}
+	xcb_connection_t *connection = QX11Info::connection();
+	xcb_screen_t *first_screen = xcb_setup_roots_iterator (xcb_get_setup (connection)).data;
+	if(!first_screen)
+	{
+		ADS_PRINT("No screen found via XCB.");
+		return "UNKNOWN";
+	}
+	// Get supporting window ()
+	xcb_window_t root = first_screen->root;
+	xcb_window_t support_win = 0;
+	QVector<xcb_window_t> sup_windows;
+	xcb_get_prop_list(root, "_NET_SUPPORTING_WM_CHECK", sup_windows, XCB_ATOM_WINDOW);
+	if(sup_windows.length() == 0)
+	{
+		// This doesn't seem to be in use anymore, but wmctrl does the same so lets play safe.
+		// Both XCB_ATOM_CARDINAL and XCB_ATOM_WINDOW break down to a uint32_t, so reusing sup_windows should be fine.
+		xcb_get_prop_list(root, "_WIN_SUPPORTING_WM_CHECK", sup_windows, XCB_ATOM_CARDINAL);
+	}
+	if(sup_windows.length() == 0)
+	{
+		ADS_PRINT("Failed to get the supporting window on non EWMH comform WM.");
+		return "UNKNOWN";
+	}
+	support_win = sup_windows[0];
+	QString ret = xcb_get_prop_string(support_win, "_NET_WM_NAME");
+	if(ret.length() == 0)
+	{
+		ADS_PRINT("Empty WM name occured.");
+		return "UNKNOWN";
+	}
+	return ret;
+}
+
+//============================================================================
+QString windowManager()
+{
+	if(_window_manager.length() == 0)
+	{
+		_window_manager = detectWindowManagerX11();
+	}
+	return _window_manager;
+}
+#endif
+
+
 //============================================================================
 void replaceSplitterWidget(QSplitter* Splitter, QWidget* From, QWidget* To)
 {
@@ -118,6 +362,31 @@ void setButtonIcon(QAbstractButton* Button, QStyle::StandardPixmap StandarPixmap
 #endif
 }
 
+
+//============================================================================
+void repolishStyle(QWidget* w, eRepolishChildOptions Options)
+{
+	if (!w)
+	{
+		return;
+	}
+	w->style()->unpolish(w);
+	w->style()->polish(w);
+
+	if (RepolishIgnoreChildren == Options)
+	{
+		return;
+	}
+
+	QList<QWidget*> Children = w->findChildren<QWidget*>(QString(),
+		(RepolishDirectChildren == Options) ? Qt::FindDirectChildrenOnly: Qt::FindChildrenRecursively);
+	for (auto Widget : Children)
+	{
+		Widget->style()->unpolish(Widget);
+		Widget->style()->polish(Widget);
+	}
+}
+
 } // namespace internal
 } // namespace ads
 

src/ads_globals.h

@@ -36,6 +36,11 @@
 #include <QWidget>
 #include <QDebug>
 #include <QStyle>
+#include <QMouseEvent>
+
+#ifdef Q_OS_LINUX
+#include <xcb/xcb.h>
+#endif
 
 QT_FORWARD_DECLARE_CLASS(QAbstractButton)
 
@@ -64,13 +69,6 @@ QT_FORWARD_DECLARE_CLASS(QSplitter)
 
 namespace ads
 {
-enum eStateFileVersion
-{
-	InitialVersion = 0,
-	Version1 = 1,
-	CurrentVersion = Version1
-};
-
 class CDockSplitter;
 
 enum DockWidgetArea
@@ -129,6 +127,7 @@ enum eBitwiseOperator
 	BitwiseOr
 };
 
+
 namespace internal
 {
 static const bool RestoreTesting = true;
@@ -136,6 +135,33 @@ static const bool Restore = false;
 static const char* const ClosedProperty = "close";
 static const char* const DirtyProperty = "dirty";
 
+#ifdef Q_OS_LINUX
+// Utils to directly communicate with the X server
+/**
+ * Get atom from cache or request it from the XServer.
+ */
+xcb_atom_t xcb_get_atom(const char *name);
+
+/**
+ * Add a property to a window. Only works on "hidden" windows.
+ */
+void xcb_add_prop(bool state, WId window, const char *type, const char *prop);
+/**
+ * Updates up to two window properties. Can be set on a visible window.
+ */
+void xcb_update_prop(bool set, WId window, const char *type, const char *prop, const char *prop2 = nullptr);
+/**
+ * Only for debugging purposes.
+ */
+bool xcb_dump_props(WId window, const char *type);
+/**
+ * Gets the active window manager from the X11 Server.
+ * Requires a EWMH conform window manager (Allmost all common used ones are).
+ * Returns "UNKNOWN" otherwise.
+ */
+QString windowManager();
+#endif
+
 /**
  * Replace the from widget in the given splitter with the To widget
  */
@@ -154,7 +180,7 @@ void hideEmptyParentSplitters(CDockSplitter* FirstParentSplitter);
 class CDockInsertParam : public QPair<Qt::Orientation, bool>
 {
 public:
-	using QPair::QPair;
+    using QPair<Qt::Orientation, bool>::QPair;
 	Qt::Orientation orientation() const {return this->first;}
 	bool append() const {return this->second;}
 	int insertOffset() const {return append() ? 1 : 0;}
@@ -235,6 +261,19 @@ void setToolTip(QObjectPtr obj, const QString &tip)
 }
 
 
+/**
+ * Helper function for access to mouse event global position in Qt5 and
+ */
+inline QPoint globalPositionOf(QMouseEvent* ev)
+{
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    return ev->globalPosition().toPoint();
+#else
+    return ev->globalPos();
+#endif
+}
+
+
 /**
  * Helper function to set the icon of a certain button.
  * Use this function to set the icons for the dock area and dock widget buttons.
@@ -251,6 +290,21 @@ void setToolTip(QObjectPtr obj, const QString &tip)
 void setButtonIcon(QAbstractButton* Button, QStyle::StandardPixmap StandarPixmap,
 	ads::eIcon CustomIconId);
 
+
+enum eRepolishChildOptions
+{
+	RepolishIgnoreChildren,
+	RepolishDirectChildren,
+	RepolishChildrenRecursively
+};
+
+/**
+ * Calls unpolish() / polish for the style of the given widget to update
+ * stylesheet if a property changes
+ */
+void repolishStyle(QWidget* w, eRepolishChildOptions Options = RepolishIgnoreChildren);
+
+
 } // namespace internal
 } // namespace ads
 

src/images/close-button-disabled.svg

@@ -1,6 +1,4 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!-- Generator: Adobe Illustrator 16.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
-
 <svg
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:cc="http://creativecommons.org/ns#"
@@ -9,114 +7,133 @@
    xmlns="http://www.w3.org/2000/svg"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   version="1.1"
-   id="Capa_1"
-   x="0px"
-   y="0px"
-   width="512"
-   height="512"
-   viewBox="0 0 512 512"
-   xml:space="preserve"
    sodipodi:docname="close-button-disabled.svg"
-   inkscape:version="0.92.3 (2405546, 2018-03-11)"><metadata
-   id="metadata897"><rdf:RDF><cc:Work
-       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
-         rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title></dc:title></cc:Work></rdf:RDF></metadata><defs
-   id="defs895" /><sodipodi:namedview
-   pagecolor="#ffffff"
-   bordercolor="#666666"
-   borderopacity="1"
-   objecttolerance="10"
-   gridtolerance="10"
-   guidetolerance="10"
-   inkscape:pageopacity="0"
-   inkscape:pageshadow="2"
-   inkscape:window-width="1920"
-   inkscape:window-height="1017"
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-   showgrid="false"
-   fit-margin-top="0"
-   fit-margin-left="0"
-   fit-margin-right="0"
-   fit-margin-bottom="0"
-   inkscape:zoom="0.85862966"
-   inkscape:cx="345.29142"
-   inkscape:cy="32.731258"
-   inkscape:window-x="-8"
-   inkscape:window-y="-8"
-   inkscape:window-maximized="1"
-   inkscape:current-layer="Capa_1" />
-<g
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-   transform="matrix(0.71708683,0,0,0.71708683,128,128)"
-   style="stroke:none;stroke-opacity:1;fill:#000000;fill-opacity:0.50196081">
-	<g
-   id="close"
-   style="stroke:none;stroke-opacity:1;fill:#000000;fill-opacity:0.50196081">
-		<polygon
-   points="357,321.3 214.2,178.5 357,35.7 321.3,0 178.5,142.8 35.7,0 0,35.7 142.8,178.5 0,321.3 35.7,357 178.5,214.2 321.3,357 "
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-   style="stroke:none;stroke-opacity:1;fill:#000000;fill-opacity:0.50196081" />
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-   transform="translate(0,155)">
-</g>
-<g
-   id="g890"
-   transform="translate(0,155)">
-</g>
-</svg>
+   inkscape:version="1.0 (4035a4fb49, 2020-05-01)"
+   version="1.1"
+   id="svg2"
+   viewBox="0 0 16 16"
+   height="16px"
+   width="16px">
+  <style
+     id="style2"></style>
+  <defs
+     id="defs4">
+    <pattern
+       id="EMFhbasepattern"
+       patternUnits="userSpaceOnUse"
+       width="6"
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+       patternUnits="userSpaceOnUse"
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+       height="6"
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+  <sodipodi:namedview
+     inkscape:guide-bbox="true"
+     showguides="true"
+     inkscape:document-rotation="0"
+     inkscape:snap-global="true"
+     inkscape:snap-bbox-midpoints="true"
+     inkscape:snap-bbox-edge-midpoints="true"
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+     inkscape:bbox-paths="true"
+     inkscape:snap-bbox="true"
+     inkscape:window-maximized="1"
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+     inkscape:current-layer="g5228"
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+            <rdf:li>Jemis Mali</rdf:li>
+          </rdf:Bag>
+        </dc:creator>
+      </rdf:Description>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+</svg>