Merge branch 'master' of https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System

This allows to subscribe to events of the newly created window.
A common use case is to show a message box if a dock container with many modified documents in it is closed. This allows for the user to decide whether he wants to save / discard all the changes or cancel the closing of the window.

CMakeLists.txt

@@ -42,6 +42,7 @@ set(ads_SRCS
     src/FloatingDockContainer.cpp
 	src/FloatingDragPreview.cpp
 	src/IconProvider.cpp
+	src/DockComponentsFactory.cpp
     src/ads.qrc
     src/linux/FloatingWidgetTitleBar.cpp
 )
@@ -61,6 +62,7 @@ set(ads_INSTALL_INCLUDE
     src/FloatingDockContainer.h
 	src/FloatingDragPreview.h
 	src/IconProvider.h
+	src/DockComponentsFactory.h
     src/linux/FloatingWidgetTitleBar.h
 )
 if("${CMAKE_SIZEOF_VOID_P}" STREQUAL "4")
@@ -80,7 +82,7 @@ install(FILES ${ads_INSTALL_INCLUDE}
     COMPONENT headers
 )
 install(FILES 
-    "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE.md"
+    "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE"
     "${CMAKE_CURRENT_SOURCE_DIR}/gnu-lgpl-v2.1.md"
     DESTINATION license 
     COMPONENT license

LICENSE

@@ -0,0 +1,504 @@
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LICENSE.md

@@ -1,15 +0,0 @@
-Qt Advanced Docking System
-Copyright (C) 2017 Uwe Kindler
-
-This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Lesser General Public
-License as published by the Free Software Foundation; either
-version 2.1 of the License, or (at your option) any later version.
-
-This library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Lesser General Public License for more details.
-
-You should have received a copy of the GNU Lesser General Public
-License along with this library; If not, see <http://www.gnu.org/licenses/>.

README.md

@@ -1,4 +1,5 @@
-# Advanced Docking System for Qt 
+# 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://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)
@@ -20,18 +21,36 @@ code quality, readibility and to fix all issues from the issue tracker
 of his docking system project.
 
 ## Features
+
 ### Overview
-- [Docking everywhere - no central widget](#docking-everywhere---no-central-widget)
-- [Docking inside floating windows](#docking-inside-floating-windows)
-- [Grouped dragging](#grouped-dragging)
-- [Perspectives for fast switching of the complete main window layout](#perspectives-for-fast-switching-of-the-complete-main-window-layout)
-- [Opaque and non-opaque splitter resizing](#opaque-and-non-opaque-splitter-resizing)
-- [Opaque and non-opaque undocking](#opaque-and-non-opaque-undocking)
-- [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)
+
+- [Advanced Docking System for Qt](#advanced-docking-system-for-qt)
+  - [Features](#features)
+    - [Overview](#overview)
+    - [Docking everywhere - no central widget](#docking-everywhere---no-central-widget)
+    - [Docking inside floating windows](#docking-inside-floating-windows)
+    - [Grouped dragging](#grouped-dragging)
+    - [Perspectives for fast switching of the complete main window layout](#perspectives-for-fast-switching-of-the-complete-main-window-layout)
+    - [Opaque and non-opaque splitter resizing](#opaque-and-non-opaque-splitter-resizing)
+    - [Opaque and non-opaque undocking](#opaque-and-non-opaque-undocking)
+    - [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)
+  - [Tested Compatible Environments](#tested-compatible-environments)
+    - [Windows](#windows)
+    - [macOS](#macos)
+    - [Linux](#linux)
+  - [Build](#build)
+  - [Getting started / Example](#getting-started--example)
+  - [Developers](#developers)
+  - [License information](#license-information)
+  - [Alternative Docking System Implementations](#alternative-docking-system-implementations)
+    - [KDDockWidgets](#kddockwidgets)
+    - [QtitanDocking](#qtitandocking)
+  - [Donation](#donation)
 
 ### Docking everywhere - no central widget
+
 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.
@@ -41,6 +60,7 @@ free to dock almost everywhere.
 ![Dropping widgets](doc/preview-dragndrop_dark.png)
 
 ### Docking inside floating windows
+
 There is no difference between the main window and a floating window. Docking
 into floating windows is supported.
 
@@ -49,26 +69,29 @@ into floating windows is supported.
 ![Docking inside floating windows](doc/floating-widget-dragndrop_dark.png)
 
 ### Grouped dragging
+
 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.png)\
+![Grouped dragging](doc/grouped-dragging.gif)\
 \
 ![Grouped dragging](doc/grouped-dragging_dark.png)
 
 ### Perspectives for fast switching of the complete main window layout
+
 A perspective defines the set and layout of dock windows in the main
 window. You can save the current layout of the dockmanager into a named
 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.png)\
+![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. 
 
 ![Opaque resizing](doc/opaque_resizing.gif)
@@ -78,6 +101,7 @@ If this flag is cleared, the widget resizing is deferred until the mouse button
 ![Non-opaque resizing](doc/non_opaque_resizing.gif)
 
 ### Opaque and non-opaque undocking
+
 By default, opaque undocking is active. That means, as soon as you drag a dock widget or a dock area with a number of dock widgets it will be undocked and moved into a floating widget and then the floating widget will be dragged around. That means undocking will take place immediatelly. You can compare this with opaque splitter resizing. If the flag `OpaqueUndocking` is cleared, then non-opaque undocking is active. In this mode, undocking is more like a standard drag and drop operation. That means, the dragged dock widget or dock area is not undocked immediatelly. Instead, a drag preview widget is created and dragged around to indicate the future position of the dock widget or dock area. The actual dock operation is only executed when the mouse button is released. That makes it possible, to cancel an active drag operation with the escape key.
 
 The drag preview widget can be configured by a number of global dock manager flags:
@@ -88,26 +112,33 @@ The drag preview widget can be configured by a number of global dock manager fla
 The best way to test non-opaque undocking is to set the standard flags: `CDockManager::setConfigFlags(CDockManager::DefaultNonOpaqueConfig)`.
 
 ### Tab-menu for easy handling of many tabbed dock widgets
+
 Tabs are a good way to quickly switch between dockwidgets in a dockarea. However, if the number of dockwidgets in a dockarea is too large, this may affect the usability of the tab bar. To keep track in this situation, you can use the tab menu. The menu allows you to quickly select the dockwidget you want to activate from a drop down menu.
 
 ![Tab menu](doc/tab_menu.gif)
 
 ### Many different ways to detach dock widgets
+
 You can detach dock widgets and also dock areas in the following ways:
+
 - by dragging the dock widget tab or the dock area title bar
 - by double clicking the tab or title bar
 - by using the detach menu entry from the tab and title bar drop down menu
 
 ### Supports deletion of dynamically created dock widgets
+
 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.
 
 ## Tested Compatible Environments
+
 ### 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)
 
 The library was developed on and for Windows. It is used in a commercial Windows application and is therefore constantly tested.
 
 ### macOS
+
 macOS [![Build Status](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Docking-System.svg?branch=master)](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Docking-System)
 
 The application can be compiled for macOS. A user reported, that the library works on macOS. If have not tested it.
@@ -115,6 +146,7 @@ The application can be compiled for macOS. A user reported, that the library wor
 ![Advanced Docking on macOS](doc/macos.png)
 
 ### 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://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)
 
@@ -127,10 +159,12 @@ and with **Ubuntu 19.10**
 ![Advanced Docking on Ubuntu Linux](doc/linux_ubuntu_1910.png)
 
 ## Build
+
 Open the `ads.pro` with QtCreator and start the build, that's it.
 You can run the demo project and test it yourself.
 
 ## Getting started / Example
+
 The following example shows the minimum code required to use the advanced Qt docking system.
 
 *MainWindow.h*
@@ -158,7 +192,9 @@ private:
     ads::CDockManager* m_DockManager;
 };
 ```
+
 *MainWindow.cpp*
+
 ```cpp
 #include "MainWindow.h"
 #include "ui_MainWindow.h"
@@ -202,17 +238,22 @@ MainWindow::~MainWindow()
 ```
 
 ## Developers
+
 - Uwe Kindler, Project Maintainer
 - Manuel Freiholz 
 
 ## License information
+
 [![License: LGPL v2.1](https://img.shields.io/badge/License-LGPL%20v2.1-blue.svg)](gnu-lgpl-v2.1.md)
 This project uses the [LGPLv2.1 license](gnu-lgpl-v2.1.md)
 
+
 ## Alternative Docking System Implementations
+
 If this Qt Advanced Docking System does not fit to your needs you may consider some of the alternative docking system solutions for Qt.
 
 ### KDDockWidgets
+
 This is an advanced docking framework for Qt from [KDAB](https://www.kdab.com/). The interesting thing is, that they separated GUI code from logic, so they can easily provide a QtQuick backend in the future.
 
 - [Blog post about KDDockWidgets](https://www.kdab.com/kddockwidgets/)
@@ -220,6 +261,15 @@ This is an advanced docking framework for Qt from [KDAB](https://www.kdab.com/).
 
 
 ### QtitanDocking
+
 This is a commercial component from [Developer Machines](https://www.devmachines.com/) for Qt Framework that allows to create a Microsoft like dockable user interface. They also offer a lot of other interesting and useful components for Qt.
 
 - [Product page](https://www.devmachines.com/qtitandocking-overview.html)
+
+## Donation
+
+If this project help you reduce time to develop or if you just like it, you can give me a cup of coffee :coffee::wink:.
+
+<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=85R64TMMSY9T6">
+  <img src="doc/donate.png" alt="Donate with PayPal" width="160"/>
+</a>

demo/CMakeLists.txt

@@ -19,6 +19,12 @@ set(ads_demo_COMPILE_DEFINE ${ads_demo_COMPILE_DEFINE} ${Qt5Gui_COMPILE_DEFINITI
 set(ads_demo_LIBS ${ads_demo_LIBS} ${Qt5Widgets_LIBRARIES})
 set(ads_demo_INCLUDE ${ads_demo_INCLUDE} ${Qt5Widgets_INCLUDE_DIRS})
 set(ads_demo_COMPILE_DEFINE ${ads_demo_COMPILE_DEFINE} ${Qt5Widgets_COMPILE_DEFINITIONS})
+if(WIN32)
+	find_package(Qt5AxContainer ${REQUIRED_QT_VERSION} REQUIRED)
+	set(ads_demo_LIBS ${ads_demo_LIBS} ${Qt5AxContainer_LIBRARIES})
+	set(ads_demo_INCLUDE ${ads_demo_INCLUDE} ${Qt5AxContainer_INCLUDE_DIRS})
+	set(ads_demo_COMPILE_DEFINE ${ads_demo_COMPILE_DEFINE} ${Qt5AxContainer_COMPILE_DEFINITIONS})
+endif()
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 set(ads_demo_SRCS
     main.cpp

demo/MainWindow.cpp

@@ -53,6 +53,16 @@
 #include <QRubberBand>
 #include <QPlainTextEdit>
 #include <QTableWidget>
+#include <QScreen>
+#include <QStyle>
+#include <QMessageBox>
+#include <QMenu>
+#include <QToolButton>
+
+
+#ifdef Q_OS_WIN
+#include <QAxWidget>
+#endif
 
 #include <QMap>
 #include <QElapsedTimer>
@@ -60,7 +70,11 @@
 #include "DockManager.h"
 #include "DockWidget.h"
 #include "DockAreaWidget.h"
+#include "DockAreaTitleBar.h"
+#include "DockAreaTabBar.h"
 #include "FloatingDockContainer.h"
+#include "DockComponentsFactory.h"
+
 
 
 //============================================================================
@@ -122,7 +136,7 @@ static void appendFeaturStringToWindowTitle(ads::CDockWidget* DockWidget)
  */
 static QIcon svgIcon(const QString& File)
 {
-	// This is a workaround, because because in item views SVG icons are not
+	// This is a workaround, because in item views SVG icons are not
 	// properly scaled an look blurry or pixelate
 	QIcon SvgIcon(File);
 	SvgIcon.addPixmap(SvgIcon.pixmap(92));
@@ -130,6 +144,25 @@ static QIcon svgIcon(const QString& File)
 }
 
 
+//============================================================================
+class CCustomComponentsFactory : public ads::CDockComponentsFactory
+{
+public:
+	using Super = ads::CDockComponentsFactory;
+	ads::CDockAreaTitleBar* createDockAreaTitleBar(ads::CDockAreaWidget* DockArea) const override
+	{
+		auto TitleBar = new ads::CDockAreaTitleBar(DockArea);
+		auto CustomButton = new QToolButton(DockArea);
+		CustomButton->setToolTip(QObject::tr("Help"));
+		CustomButton->setIcon(svgIcon(":/adsdemo/images/help_outline.svg"));
+		CustomButton->setAutoRaise(true);
+		int Index = TitleBar->indexOf(TitleBar->button(ads::TitleBarButtonTabsMenu));
+		TitleBar->insertWidget(Index + 1, CustomButton);
+		return TitleBar;
+	}
+};
+
+
 //============================================================================
 static ads::CDockWidget* createCalendarDockWidget(QMenu* ViewMenu)
 {
@@ -171,33 +204,63 @@ static ads::CDockWidget* createEditorWidget(QMenu* ViewMenu)
 	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;
 }
 
+
 //============================================================================
 static ads::CDockWidget* createTableWidget(QMenu* ViewMenu)
 {
-   static int TableCount = 0;
-   QTableWidget* w = new QTableWidget();
-   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)));
-      }
-   }
+	static int TableCount = 0;
+	QTableWidget* w = new QTableWidget();
+	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"));
+	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);
-   DockWidget->setIcon(svgIcon(":/adsdemo/images/grid_on.svg"));
    ViewMenu->addAction(DockWidget->toggleViewAction());
    return DockWidget;
 }
+#endif
 
 
 //============================================================================
@@ -246,7 +309,6 @@ struct MainWindowPrivate
 	void restorePerspectives();
 };
 
-
 //============================================================================
 void MainWindowPrivate::createContent()
 {
@@ -254,12 +316,23 @@ void MainWindowPrivate::createContent()
 	QMenu* ViewMenu = ui.menuView;
 	auto DockWidget = createCalendarDockWidget(ViewMenu);
 	DockWidget->setFeature(ads::CDockWidget::DockWidgetClosable, false);
-	DockManager->addDockWidget(ads::LeftDockWidgetArea, DockWidget);
+	DockWidget->setFeature(ads::CDockWidget::DockWidgetMovable, false);
+	DockWidget->setFeature(ads::CDockWidget::DockWidgetFloatable, false);
+	auto SpecialDockArea = DockManager->addDockWidget(ads::LeftDockWidgetArea, DockWidget);
+
+	// For this Special Dock Area we want to avoid dropping on the center of it (i.e. we don't want this widget to be ever tabbified):
+	{
+		SpecialDockArea->setAllowedAreas(ads::OuterDockAreas);
+		//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);
+	FileSystemWidget->setFeature(ads::CDockWidget::DockWidgetFloatable, false);
+	appendFeaturStringToWindowTitle(FileSystemWidget);
 	DockManager->addDockWidget(ads::BottomDockWidgetArea, FileSystemWidget);
 
 	FileSystemWidget = createFileSystemTreeDockWidget(ViewMenu);
@@ -269,25 +342,59 @@ void MainWindowPrivate::createContent()
 	FileSystemWidget->setFeature(ads::CDockWidget::DockWidgetMovable, false);
 	FileSystemWidget->setFeature(ads::CDockWidget::DockWidgetFloatable, false);
 	appendFeaturStringToWindowTitle(FileSystemWidget);
+
+	// Test custom factory - we inject a help button into the title bar
+	ads::CDockComponentsFactory::setFactory(new CCustomComponentsFactory());
 	auto TopDockArea = DockManager->addDockWidget(ads::TopDockWidgetArea, FileSystemWidget);
+	ads::CDockComponentsFactory::resetDefaultFactory();
+
+	// We create a calendar widget and clear all flags to prevent the dock area
+	// from closing
 	DockWidget = createCalendarDockWidget(ViewMenu);
 	DockWidget->setFeature(ads::CDockWidget::DockWidgetClosable, false);
+	DockWidget->setFeature(ads::CDockWidget::DockWidgetMovable, false);
+	DockWidget->setFeature(ads::CDockWidget::DockWidgetFloatable, false);
 	DockWidget->setTabToolTip(QString("Tab ToolTip\nHodie est dies magna"));
-	DockManager->addDockWidget(ads::CenterDockWidgetArea, DockWidget, TopDockArea);
+	auto DockArea = DockManager->addDockWidget(ads::CenterDockWidgetArea, DockWidget, TopDockArea);
+
+	// Now we add a custom button to the dock area title bar that will create
+	// new editor widgets when clicked
+	auto CustomButton = new QToolButton(DockArea);
+	CustomButton->setToolTip(QObject::tr("Create Editor"));
+	CustomButton->setIcon(svgIcon(":/adsdemo/images/plus.svg"));
+	CustomButton->setAutoRaise(true);
+	auto TitleBar = DockArea->titleBar();
+	int Index = TitleBar->indexOf(TitleBar->tabBar());
+	TitleBar->insertWidget(Index + 1, CustomButton);
+	QObject::connect(CustomButton, &QToolButton::clicked, [=]()
+	{
+		auto DockWidget = createEditorWidget(ui.menuView);
+		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::RightDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
+	DockManager->addDockWidget(ads::CenterDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
 	DockManager->addDockWidget(ads::CenterDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), BottomDockArea);
 
     auto Action = ui.menuView->addAction(QString("Set %1 floating").arg(DockWidget->windowTitle()));
     DockWidget->connect(Action, SIGNAL(triggered()), SLOT(setFloating()));
 
+#ifdef Q_OS_WIN
+    if (!DockManager->configFlags().testFlag(ads::CDockManager::OpaqueUndocking))
+    {
+    	DockManager->addDockWidget(ads::CenterDockWidgetArea, createActiveXWidget(ViewMenu), RighDockArea);
+    }
+#endif
+
 	for (auto DockWidget : DockManager->dockWidgetsMap())
 	{
 		_this->connect(DockWidget, SIGNAL(viewToggled(bool)), SLOT(onViewToggled(bool)));
+		_this->connect(DockWidget, SIGNAL(visibilityChanged(bool)), SLOT(onViewVisibilityChanged(bool)));
 	}
 }
 
@@ -372,24 +479,46 @@ CMainWindow::CMainWindow(QWidget *parent) :
 {
 	using namespace ads;
 	d->ui.setupUi(this);
+
 	d->createActions();
 
 	// uncomment the following line if the tab close button should be
 	// a QToolButton instead of a QPushButton
 	// CDockManager::setConfigFlags(CDockManager::configFlags() | CDockManager::TabCloseButtonIsToolButton);
 
+    // uncomment the following line if you want to use opaque undocking and
+	// opaque splitter resizing
+    // CDockManager::setConfigFlags(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
-    // CDockManager::setConfigFlag(CDockManager::RetainTabSizeWhenCloseButtonHidden, true);
+    //CDockManager::setConfigFlag(CDockManager::RetainTabSizeWhenCloseButtonHidden, true);
 
-    // uncomment the follwing line if you want to use non opaque undocking and splitter
-    // movements
-    // CDockManager::setConfigFlags(CDockManager::DefaultNonOpaqueConfig);
+	// uncomment the following line if you don't want close button on DockArea's title bar
+	//CDockManager::setConfigFlag(CDockManager::DockAreaHasCloseButton, false);
+
+	// uncomment the following line if you don't want undock button on DockArea's title bar
+	//CDockManager::setConfigFlag(CDockManager::DockAreaHasUndockButton, false);
+
+	// uncomment the following line if you don't want tabs menu button on DockArea's title bar
+	//CDockManager::setConfigFlag(CDockManager::DockAreaHasTabsMenuButton, false);
+
+	// uncomment the following line if you don't want disabled buttons to appear on DockArea's title bar
+	//CDockManager::setConfigFlag(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
+	//CDockManager::setConfigFlag(CDockManager::DockAreaDynamicTabsMenuButtonVisibility, true);
+
+	// uncomment the following line if you want floating container to always show application title instead of active dock widget's title
+	//CDockManager::setConfigFlag(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
+	//CDockManager::setConfigFlag(CDockManager::FloatingContainerHasWidgetIcon, true);
 
 	// Now create the dock manager and its content
 	d->DockManager = new CDockManager(this);
 
-	// Uncomment the following line to have the old style where the dock
+	// uncomment the following line to have the old style where the dock
 	// area close button closes the active tab
 	// CDockManager::setConfigFlags({CDockManager::DockAreaHasCloseButton
 	//	| CDockManager::DockAreaCloseButtonClosesTab});
@@ -397,8 +526,12 @@ CMainWindow::CMainWindow(QWidget *parent) :
 		d->DockManager, SLOT(openPerspective(const QString&)));
 
 	d->createContent();
-	// Default window geometry
+	// Default window geometry - center on screen
     resize(1280, 720);
+    setGeometry(QStyle::alignedRect(
+        Qt::LeftToRight, Qt::AlignCenter, frameSize(),
+        QGuiApplication::primaryScreen()->availableGeometry()
+    ));
 
 	//d->restoreState();
 	d->restorePerspectives();
@@ -468,6 +601,19 @@ void CMainWindow::onViewToggled(bool Open)
 }
 
 
+//============================================================================
+void CMainWindow::onViewVisibilityChanged(bool Visible)
+{
+	auto DockWidget = qobject_cast<ads::CDockWidget*>(sender());
+    if (!DockWidget)
+    {
+        return;
+    }
+
+    qDebug() << DockWidget->objectName() << " visibilityChanged(" << Visible << ")";
+}
+
+
 //============================================================================
 void CMainWindow::createEditor()
 {
@@ -475,6 +621,21 @@ void CMainWindow::createEditor()
 	DockWidget->setFeature(ads::CDockWidget::DockWidgetDeleteOnClose, true);
 	auto FloatingWidget = d->DockManager->addDockWidgetFloating(DockWidget);
     FloatingWidget->move(QPoint(20, 20));
+    connect(DockWidget, SIGNAL(closeRequested()), SLOT(onEditorCloseRequested()));
+}
+
+
+//============================================================================
+void CMainWindow::onEditorCloseRequested()
+{
+	auto DockWidget = qobject_cast<ads::CDockWidget*>(sender());
+	int Result = QMessageBox::question(this, "Close Editor", QString("Editor %1 "
+		"contains unsaved changes? Would you like to close it?")
+		.arg(DockWidget->windowTitle()));
+	if (QMessageBox::Yes == Result)
+	{
+		DockWidget->closeDockWidget();
+	}
 }
 
 

demo/MainWindow.h

@@ -59,8 +59,10 @@ private slots:
 	void on_actionRestoreState_triggered(bool);
 	void savePerspective();
 	void onViewToggled(bool Open);
+	void onViewVisibilityChanged(bool Visible);
 	void createEditor();
 	void createTable();
+	void onEditorCloseRequested();
 };
 
 #endif // MAINWINDOW_H

demo/app.css

@@ -0,0 +1,4 @@
+ads--CTitleBarButton::menu-indicator
+{
+    image: none;
+}

demo/demo.pro

@@ -3,6 +3,11 @@ ADS_OUT_ROOT = $${OUT_PWD}/..
 TARGET = AdvancedDockingSystemDemo
 DESTDIR = $${ADS_OUT_ROOT}/lib
 QT += core gui widgets
+
+win32 {
+QT += axcontainer
+}
+
 CONFIG += c++14
 CONFIG += debug_and_release
 DEFINES += QT_DEPRECATED_WARNINGS

demo/demo.qrc

@@ -9,5 +9,9 @@
         <file>images/date_range.svg</file>
         <file>images/edit.svg</file>
         <file>images/grid_on.svg</file>
+        <file>images/custom-menu-button.svg</file>
+        <file>app.css</file>
+        <file>images/plus.svg</file>
+        <file>images/help_outline.svg</file>
     </qresource>
 </RCC>

demo/images/custom-menu-button.svg

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:svg="http://www.w3.org/2000/svg" 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" width="16px" height="16px" viewBox="0 0 16 16" id="svg2" version="1.1" inkscape:version="0.91 r13725" sodipodi:docname="38 - menu bar lines option list hamburger web.svg">
+  <defs id="defs4">
+    <pattern y="0" x="0" height="6" width="6" patternUnits="userSpaceOnUse" id="EMFhbasepattern"/>
+    <pattern y="0" x="0" height="6" width="6" patternUnits="userSpaceOnUse" id="EMFhbasepattern-4"/>
+    <pattern y="0" x="0" height="6" width="6" patternUnits="userSpaceOnUse" id="EMFhbasepattern-3"/>
+    <pattern y="0" x="0" height="6" width="6" patternUnits="userSpaceOnUse" id="EMFhbasepattern-8"/>
+  </defs>
+  <sodipodi:namedview id="base" pagecolor="#ffffff" bordercolor="#666666" borderopacity="1.0" inkscape:pageopacity="0.0" inkscape:pageshadow="2" inkscape:zoom="22.627417" inkscape:cx="6.2316889" inkscape:cy="7.4271635" inkscape:document-units="px" inkscape:current-layer="g5228" showgrid="true" units="px" inkscape:window-width="1366" inkscape:window-height="705" inkscape:window-x="-8" inkscape:window-y="-8" inkscape:window-maximized="1" inkscape:snap-bbox="true" inkscape:bbox-paths="true" inkscape:bbox-nodes="true" inkscape:snap-bbox-edge-midpoints="true" inkscape:snap-bbox-midpoints="true" inkscape:snap-global="true">
+    <inkscape:grid type="xygrid" id="grid3336"/>
+  </sodipodi:namedview>
+  
+  <g inkscape:label="Layer 1" inkscape:groupmode="layer" id="layer1" transform="translate(0,-1036.3622)">
+    <g transform="translate(628,-140.49998)" id="g5228">
+      <path style="color:#000000;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:medium;line-height:normal;font-family:sans-serif;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:normal;word-spacing:normal;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;baseline-shift:baseline;text-anchor:start;white-space:normal;clip-rule:nonzero;display:inline;overflow:visible;visibility:visible;opacity:1;isolation:auto;mix-blend-mode:normal;color-interpolation:sRGB;color-interpolation-filters:linearRGB;solid-color:#000000;solid-opacity:1;fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:1px;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;color-rendering:auto;image-rendering:auto;shape-rendering:auto;text-rendering:auto;enable-background:accumulate" d="M 4.484375 4 A 0.50005 0.50005 0 0 0 4.5351562 5 L 11.464844 5 A 0.50005 0.50005 0 1 0 11.464844 4 L 4.5351562 4 A 0.50005 0.50005 0 0 0 4.484375 4 z M 4.484375 7 A 0.50005 0.50005 0 0 0 4.5351562 8 L 11.464844 8 A 0.50005 0.50005 0 1 0 11.464844 7 L 4.5351562 7 A 0.50005 0.50005 0 0 0 4.484375 7 z M 4.484375 10 A 0.50005 0.50005 0 0 0 4.5351562 11 L 11.464844 11 A 0.50005 0.50005 0 1 0 11.464844 10 L 4.5351562 10 A 0.50005 0.50005 0 0 0 4.484375 10 z " transform="translate(-628,1176.8622)" id="path3340"/>
+    </g>
+  </g>
+
+	
+	
+	
+	<metadata>
+		<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:dc="http://purl.org/dc/elements/1.1/">
+			<rdf:Description about="https://iconscout.com/legal#licenses" dc:title="Menu, Bar, Lines, Option, List, Hamburger, Web" dc:description="Menu, Bar, Lines, Option, List, Hamburger, Web" dc:publisher="Iconscout" dc:date="2016-12-14" dc:format="image/svg+xml" dc:language="en">
+				<dc:creator>
+					<rdf:Bag>
+						<rdf:li>Jemis Mali</rdf:li>
+					</rdf:Bag>
+				</dc:creator>
+			</rdf:Description>
+		</rdf:RDF>
+    </metadata></svg>

demo/images/help_outline.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>help_outline icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M938.67,512c0,235.52 -191.15,426.67 -426.67,426.67c-235.52,0 -426.67,-191.15 -426.67,-426.67c0,-235.52 191.15,-426.67 426.67,-426.67c235.52,0 426.67,191.15 426.67,426.67zM853.33,512c0,-188.16 -153.17,-341.33 -341.33,-341.33c-188.16,0 -341.33,153.17 -341.33,341.33c0,188.16 153.17,341.33 341.33,341.33c188.16,0 341.33,-153.17 341.33,-341.33zM682.67,426.67c0,106.67 -128,117.33 -128,213.33h-85.34c0,-138.67 128,-128 128,-213.33c0,-46.93 -38.4,-85.34 -85.33,-85.34c-46.93,0 -85.33,38.41 -85.33,85.34h-85.34c0,-94.29 76.38,-170.67 170.67,-170.67c94.29,0 170.67,76.38 170.67,170.67zM469.33,682.67h85.34v85.33h-85.34z"/>
+	</g>
+</svg>

demo/images/plus.svg

@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   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"
+   width="16px"
+   height="16px"
+   viewBox="0 0 16 16"
+   id="svg2"
+   version="1.1"
+   inkscape:version="0.92.4 (5da689c313, 2019-01-14)"
+   sodipodi:docname="plus.svg">
+  <defs
+     id="defs4">
+    <pattern
+       y="0"
+       x="0"
+       height="6"
+       width="6"
+       patternUnits="userSpaceOnUse"
+       id="EMFhbasepattern" />
+    <pattern
+       y="0"
+       x="0"
+       height="6"
+       width="6"
+       patternUnits="userSpaceOnUse"
+       id="EMFhbasepattern-4" />
+    <pattern
+       y="0"
+       x="0"
+       height="6"
+       width="6"
+       patternUnits="userSpaceOnUse"
+       id="EMFhbasepattern-3" />
+    <pattern
+       y="0"
+       x="0"
+       height="6"
+       width="6"
+       patternUnits="userSpaceOnUse"
+       id="EMFhbasepattern-8" />
+  </defs>
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="22.627417"
+     inkscape:cx="-2.5629517"
+     inkscape:cy="7.4271635"
+     inkscape:document-units="px"
+     inkscape:current-layer="g5228"
+     showgrid="true"
+     units="px"
+     inkscape:window-width="1920"
+     inkscape:window-height="1017"
+     inkscape:window-x="1912"
+     inkscape:window-y="-8"
+     inkscape:window-maximized="1"
+     inkscape:snap-bbox="true"
+     inkscape:bbox-paths="true"
+     inkscape:bbox-nodes="true"
+     inkscape:snap-bbox-edge-midpoints="true"
+     inkscape:snap-bbox-midpoints="true"
+     inkscape:snap-global="true">
+    <inkscape:grid
+       type="xygrid"
+       id="grid3336" />
+  </sodipodi:namedview>
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(0,-1036.3622)">
+    <g
+       transform="translate(628,-140.49998)"
+       id="g5228">
+      <path
+         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+         d="m -620.5,1189.8622 v -11"
+         id="path822-5"
+         inkscape:connector-curvature="0" />
+      <path
+         style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+         d="m -615,1184.3622 h -11"
+         id="path822-5-2"
+         inkscape:connector-curvature="0" />
+    </g>
+  </g>
+  <metadata
+     id="metadata12">
+    <rdf:RDF>
+      <rdf:Description
+         about="https://iconscout.com/legal#licenses"
+         dc:title="Menu, Bar, Lines, Option, List, Hamburger, Web"
+         dc:description="Menu, Bar, Lines, Option, List, Hamburger, Web"
+         dc:publisher="Iconscout"
+         dc:date="2016-12-14"
+         dc:format="image/svg+xml"
+         dc:language="en">
+        <dc:creator>
+          <rdf:Bag>
+            <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></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+</svg>

demo/main.cpp

@@ -42,6 +42,13 @@ int main(int argc, char *argv[])
 	std::shared_ptr<int> b;
 	QApplication a(argc, argv);
 	a.setQuitOnLastWindowClosed(true);
+
+	QFile StyleSheetFile(":/adsdemo/app.css");
+	StyleSheetFile.open(QIODevice::ReadOnly);
+	QTextStream StyleSheetStream(&StyleSheetFile);
+	a.setStyleSheet(StyleSheetStream.readAll());
+	StyleSheetFile.close();
+
 	qInstallMessageHandler(myMessageOutput);
 	qDebug() << "Message handler test";
 

doc/ads_icon.svg

@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   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"
+   viewBox="0,0,1024,1024"
+   id="svg1145"
+   sodipodi:docname="ads_icon.svg"
+   inkscape:version="0.92.4 (5da689c313, 2019-01-14)"
+   inkscape:export-filename="C:\CodingXP\cetoni_projects\QtAdvancedDockingSystem\doc\ads_icon_256.png"
+   inkscape:export-xdpi="24"
+   inkscape:export-ydpi="24">
+  <metadata
+     id="metadata1151">
+    <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 />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs1149" />
+  <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"
+     id="namedview1147"
+     showgrid="false"
+     inkscape:zoom="0.32593202"
+     inkscape:cx="256.13402"
+     inkscape:cy="235.82602"
+     inkscape:window-x="1912"
+     inkscape:window-y="-8"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg1145" />
+  <desc
+     id="desc1129">window_size icon - Licensed under Iconfu Standard License v1.0 (https://www.iconfu.com/iconfu_standard_license) - Incors GmbH</desc>
+  <path
+     id="path1797-1"
+     visibility="hidden"
+     d="M 71.53142,291.89723 H 950.1828 l 0.6743,0.6742 v 586.08 l -0.6743,0.6743 H 71.53142 l -0.6743,-0.6743 v -586.08 z"
+     inkscape:connector-curvature="0"
+     style="visibility:hidden;mix-blend-mode:normal;fill:#ffffff;fill-rule:nonzero;stroke-width:0.99999988;fill-opacity:1" />
+  <rect
+     transform="rotate(-90)"
+     y="412.13489"
+     x="-911.34436"
+     height="560.90375"
+     width="327.70862"
+     id="rect1739-8"
+     style="opacity:1;fill:#ffd292;fill-opacity:1;stroke:none;stroke-width:37.79526901;stroke-linecap:round;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;paint-order:fill markers stroke" />
+  <path
+     id="path1799"
+     d="M 988.40121,578.11175 V 651.2546 H 409.96541 V 578.11175 Z"
+     inkscape:connector-curvature="0"
+     style="mix-blend-mode:normal;fill:#546e7a;fill-rule:nonzero;stroke-width:0.99999988" />
+  <rect
+     style="opacity:1;fill:#b3c3cb;fill-opacity:1;stroke:none;stroke-width:37.79526901;stroke-linecap:round;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;paint-order:fill markers stroke"
+     id="rect1739-6-1"
+     width="655.41724"
+     height="338.99207"
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+     id="path1801-7"
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+     inkscape:connector-curvature="0"
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+     inkscape:connector-curvature="0"
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+  <circle
+     r="36.81749"
+     cy="169.78555"
+     cx="920.66248"
+     id="path1917-42"
+     style="opacity:1;fill:#ffa726;fill-opacity:1;stroke:none;stroke-width:63.79999924;stroke-linecap:square;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;paint-order:stroke fill markers" />
+  <circle
+     r="36.81749"
+     cy="169.78555"
+     cx="817.22302"
+     id="path1917-4-6"
+     style="opacity:1;fill:#ffffff;fill-opacity:1;stroke:none;stroke-width:63.79999924;stroke-linecap:square;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;paint-order:stroke fill markers" />
+  <path
+     id="path1799-8"
+     d="m 615.67076,292.13464 v 73.14285 H 433.023 v -73.14285 z"
+     inkscape:connector-curvature="0"
+     style="mix-blend-mode:normal;fill:#95abb6;fill-rule:nonzero;stroke-width:0.99999994;fill-opacity:1" />
+  <path
+     id="path1799-8-1"
+     d="m 798.31852,292.13464 v 73.14285 H 615.67076 v -73.14285 z"
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+     id="path1799-8-7"
+     d="m 255.79066,292.57143 v 73.14285 H 73.1429 v -73.14285 z"
+     inkscape:connector-curvature="0"
+     style="mix-blend-mode:normal;fill:#dfe5e9;fill-opacity:1;fill-rule:nonzero;stroke-width:0.99999994" />
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+     id="path1799-8-7-6"
+     d="m 616.34083,651.15739 v 73.14285 H 433.69307 v -73.14285 z"
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+</svg>

doc/ads_qt_marketplace_description.md

@@ -0,0 +1,109 @@
+# Advanced Docking System for Qt
+
+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](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/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.
+
+## Features
+
+### Overview
+
+- [Advanced Docking System for Qt](#advanced-docking-system-for-qt)
+  - [Features](#features)
+    - [Overview](#overview)
+    - [Docking everywhere - no central widget](#docking-everywhere---no-central-widget)
+    - [Docking inside floating windows](#docking-inside-floating-windows)
+    - [Grouped dragging](#grouped-dragging)
+    - [Perspectives for fast switching of the complete main window layout](#perspectives-for-fast-switching-of-the-complete-main-window-layout)
+    - [Opaque and non-opaque splitter resizing](#opaque-and-non-opaque-splitter-resizing)
+    - [Opaque and non-opaque undocking](#opaque-and-non-opaque-undocking)
+    - [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)
+
+### Docking everywhere - no central widget
+
+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](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/preview-dragndrop.png)\
+\
+![Dropping widgets](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/preview-dragndrop_dark.png)
+
+### Docking inside floating windows
+
+There is no difference between the main window and a floating window. Docking
+into floating windows is supported.
+
+![Docking inside floating windows](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/floating-widget-dragndrop.png)\
+\
+![Docking inside floating windows](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/floating-widget-dragndrop_dark.png)
+
+### Grouped dragging
+
+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](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/grouped-dragging.gif)\
+\
+![Grouped dragging](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/grouped-dragging_dark.png)
+
+### Perspectives for fast switching of the complete main window layout
+
+A perspective defines the set and layout of dock windows in the main
+window. You can save the current layout of the dockmanager into a named
+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](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/perspectives.gif)\
+\
+![Perspective](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/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. 
+
+![Opaque resizing](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/opaque_resizing.gif)
+
+If this flag is cleared, the widget resizing is deferred until the mouse button is released - this is some kind of lazy resizing separator.
+
+![Non-opaque resizing](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/non_opaque_resizing.gif)
+
+### Opaque and non-opaque undocking
+
+By default, opaque undocking is active. That means, as soon as you drag a dock widget or a dock area with a number of dock widgets it will be undocked and moved into a floating widget and then the floating widget will be dragged around. That means undocking will take place immediatelly. You can compare this with opaque splitter resizing. If the flag `OpaqueUndocking` is cleared, then non-opaque undocking is active. In this mode, undocking is more like a standard drag and drop operation. That means, the dragged dock widget or dock area is not undocked immediatelly. Instead, a drag preview widget is created and dragged around to indicate the future position of the dock widget or dock area. The actual dock operation is only executed when the mouse button is released. That makes it possible, to cancel an active drag operation with the escape key.
+
+The drag preview widget can be configured by a number of global dock manager flags:
+
+- `DragPreviewIsDynamic`: if this flag is enabled, the preview will be adjusted dynamically to the drop area
+- `DragPreviewShowsContentPixmap`: the created drag preview window shows a static copy of the content of the dock widget / dock are that is dragged
+- `DragPreviewHasWindowFrame`: this flag configures if the drag preview is frameless like a QRubberBand or looks like a real window
+
+The best way to test non-opaque undocking is to set the standard flags: `CDockManager::setConfigFlags(CDockManager::DefaultNonOpaqueConfig)`.
+
+### Tab-menu for easy handling of many tabbed dock widgets
+
+Tabs are a good way to quickly switch between dockwidgets in a dockarea. However, if the number of dockwidgets in a dockarea is too large, this may affect the usability of the tab bar. To keep track in this situation, you can use the tab menu. The menu allows you to quickly select the dockwidget you want to activate from a drop down menu.
+
+![Tab menu](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/tab_menu.gif)
+
+### Many different ways to detach dock widgets
+
+You can detach dock widgets and also dock areas in the following ways:
+
+- by dragging the dock widget tab or the dock area title bar
+- by double clicking the tab or title bar
+- by using the detach menu entry from the tab and title bar drop down menu
+
+### Supports deletion of dynamically created dock widgets
+
+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.

doc/ads_qt_marketplace_manifest.json

@@ -0,0 +1,30 @@
+{
+    "$schema": "http://qt.io/schema/extension-schema-v1#",
+    "title": "Qt Advanced Docking System",
+    "extensionType": [
+        "library"
+    ],
+    "version": "3.0.0",
+    "vendor": {
+        "name": "githubuser0xFFFF",
+        "url": "https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System"
+    },
+    "contact": "https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/issues",
+    "icon": "https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/ads_icon_512.png",
+    "licenses": [
+      { "licenseType": "LGPLv2.1",
+        "licenseUrl": "https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html" }
+    ],
+    "created": "2017-03-30",
+    "lastUpdate": "2020-01-16",
+    "platforms": [
+        "Windows 7-10", "Kubuntu 18.04", "Kubuntu 19.10", "Ubuntu 19.10"
+    ],
+    "qtVersions": [
+        "5.5.1 or newer"
+    ],
+    "tags": [
+        "Widgets", "Docking"],
+    "bugUrl": "https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/issues",
+    "sourceRepoUrl": "https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System"
+}

sip/DockWidget.sip

@@ -97,6 +97,8 @@ signals:
 	void closed();
 	void titleChanged(const QString& Title);
 	void topLevelChanged(bool topLevel);
+	void visibilityChanged(bool visible);
+    void featuresChanged(ads::CDockWidget::DockWidgetFeatures features);
 };
 
 };

src/DockAreaTabBar.cpp

@@ -54,13 +54,10 @@ namespace ads
 struct DockAreaTabBarPrivate
 {
 	CDockAreaTabBar* _this;
-	QPoint DragStartMousePos;
 	CDockAreaWidget* DockArea;
-	IFloatingWidget* FloatingWidget = nullptr;
 	QWidget* TabsContainerWidget;
 	QBoxLayout* TabsLayout;
 	int CurrentIndex = -1;
-	eDragState DragState = DraggingInactive;
 
 	/**
 	 * Private data constructor
@@ -72,14 +69,6 @@ struct DockAreaTabBarPrivate
 	 * The function reassigns the stylesheet to update the tabs
 	 */
 	void updateTabs();
-
-	/**
-	 * Test function for current drag state
-	 */
-	bool isDraggingState(eDragState dragState) const
-	{
-		return this->DragState == dragState;
-	}
 };
 // struct DockAreaTabBarPrivate
 
@@ -123,23 +112,24 @@ CDockAreaTabBar::CDockAreaTabBar(CDockAreaWidget* parent) :
 	d(new DockAreaTabBarPrivate(this))
 {
 	d->DockArea = parent;
-	setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
+	setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
 	setFrameStyle(QFrame::NoFrame);
 	setWidgetResizable(true);
 	setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 	setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 
 	d->TabsContainerWidget = new QWidget();
+	d->TabsContainerWidget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
 	d->TabsContainerWidget->setObjectName("tabsContainerWidget");
-	setWidget(d->TabsContainerWidget);
-
 	d->TabsLayout = new QBoxLayout(QBoxLayout::LeftToRight);
 	d->TabsLayout->setContentsMargins(0, 0, 0, 0);
 	d->TabsLayout->setSpacing(0);
 	d->TabsLayout->addStretch(1);
 	d->TabsContainerWidget->setLayout(d->TabsLayout);
+	setWidget(d->TabsContainerWidget);
 }
 
+
 //============================================================================
 CDockAreaTabBar::~CDockAreaTabBar()
 {
@@ -163,149 +153,6 @@ void CDockAreaTabBar::wheelEvent(QWheelEvent* Event)
 }
 
 
-//============================================================================
-void CDockAreaTabBar::mousePressEvent(QMouseEvent* ev)
-{
-	if (ev->button() == Qt::LeftButton)
-	{
-		ev->accept();
-		d->DragStartMousePos = ev->pos();
-		d->DragState = DraggingMousePressed;
-		return;
-	}
-	Super::mousePressEvent(ev);
-}
-
-
-//============================================================================
-void CDockAreaTabBar::mouseReleaseEvent(QMouseEvent* ev)
-{
-	if (ev->button() == Qt::LeftButton)
-	{
-        ADS_PRINT("CDockAreaTabBar::mouseReleaseEvent");
-		ev->accept();
-		auto CurrentDragState = d->DragState;
-		d->DragStartMousePos = QPoint();
-		d->DragState = DraggingInactive;
-		if (DraggingFloatingWidget == CurrentDragState)
-		{
-			d->FloatingWidget->finishDragging();
-		}
-		return;
-	}
-	Super::mouseReleaseEvent(ev);
-}
-
-
-//============================================================================
-void CDockAreaTabBar::mouseMoveEvent(QMouseEvent* ev)
-{
-	Super::mouseMoveEvent(ev);
-	if (!(ev->buttons() & Qt::LeftButton) || d->isDraggingState(DraggingInactive))
-	{
-		d->DragState = DraggingInactive;
-		return;
-	}
-
-    // move floating window
-    if (d->isDraggingState(DraggingFloatingWidget))
-    {
-        d->FloatingWidget->moveFloating();
-        return;
-    }
-
-	// If this is the last dock area in a dock container it does not make
-	// sense to move it to a new floating widget and leave this one
-	// empty
-	if (d->DockArea->dockContainer()->isFloating()
-	 && d->DockArea->dockContainer()->visibleDockAreaCount() == 1)
-	{
-		return;
-	}
-
-	// If one single dock widget in this area is not floatable then the whole
-	// area is not floatable
-	if (!d->DockArea->features().testFlag(CDockWidget::DockWidgetFloatable))
-	{
-		return;
-	}
-
-	int DragDistance = (d->DragStartMousePos - ev->pos()).manhattanLength();
-	if (DragDistance >= CDockManager::startDragDistance())
-	{
-        ADS_PRINT("CTabsScrollArea::startFloating");
-		startFloating(d->DragStartMousePos);
-		auto Overlay = d->DockArea->dockManager()->containerOverlay();
-		Overlay->setAllowedAreas(OuterDockAreas);
-	}
-
-	return;
-}
-
-
-//============================================================================
-void CDockAreaTabBar::mouseDoubleClickEvent(QMouseEvent *event)
-{
-	// If this is the last dock area in a dock container it does not make
-	// sense to move it to a new floating widget and leave this one
-	// empty
-	if (d->DockArea->dockContainer()->isFloating() && d->DockArea->dockContainer()->dockAreaCount() == 1)
-	{
-		return;
-	}
-
-	if (!d->DockArea->features().testFlag(CDockWidget::DockWidgetFloatable))
-	{
-		return;
-	}
-	makeAreaFloating(event->pos(), DraggingInactive);
-}
-
-
-//============================================================================
-IFloatingWidget* CDockAreaTabBar::makeAreaFloating(const QPoint& Offset, eDragState DragState)
-{
-	QSize Size = d->DockArea->size();
-	d->DragState = DragState;
-	bool OpaqueUndocking = CDockManager::configFlags().testFlag(CDockManager::OpaqueUndocking) ||
-		(DraggingFloatingWidget != DragState);
-	CFloatingDockContainer* FloatingDockContainer = nullptr;
-	IFloatingWidget* FloatingWidget;
-	if (OpaqueUndocking)
-	{
-		FloatingWidget = FloatingDockContainer = new CFloatingDockContainer(d->DockArea);
-	}
-	else
-	{
-		auto w = new CFloatingDragPreview(d->DockArea);
-		connect(w, &CFloatingDragPreview::draggingCanceled, [=]()
-		{
-			d->DragState = DraggingInactive;
-		});
-		FloatingWidget = w;
-	}
-
-    FloatingWidget->startFloating(Offset, Size, DragState, nullptr);
-    if (FloatingDockContainer)
-    {
-		auto TopLevelDockWidget = FloatingDockContainer->topLevelDockWidget();
-		if (TopLevelDockWidget)
-		{
-			TopLevelDockWidget->emitTopLevelChanged(true);
-		}
-    }
-
-	return FloatingWidget;
-}
-
-
-//============================================================================
-void CDockAreaTabBar::startFloating(const QPoint& Offset)
-{
-	d->FloatingWidget = makeAreaFloating(Offset, DraggingFloatingWidget);
-}
-
-
 //============================================================================
 void CDockAreaTabBar::setCurrentIndex(int index)
 {
@@ -323,6 +170,7 @@ void CDockAreaTabBar::setCurrentIndex(int index)
     emit currentChanging(index);
 	d->CurrentIndex = index;
 	d->updateTabs();
+	updateGeometry();
 	emit currentChanged(index);
 }
 
@@ -343,12 +191,15 @@ void CDockAreaTabBar::insertTab(int Index, CDockWidgetTab* Tab)
 	connect(Tab, SIGNAL(closeRequested()), this, SLOT(onTabCloseRequested()));
 	connect(Tab, SIGNAL(closeOtherTabsRequested()), this, SLOT(onCloseOtherTabsRequested()));
 	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);
-	if (Index <= d->CurrentIndex)
+	if (Index <= d->CurrentIndex || d->CurrentIndex == -1)
 	{
 		setCurrentIndex(d->CurrentIndex + 1);
 	}
+
+	updateGeometry();
 }
 
 
@@ -411,6 +262,8 @@ void CDockAreaTabBar::removeTab(CDockWidgetTab* Tab)
 	{
 		d->updateTabs();
 	}
+
+	updateGeometry();
 }
 
 
@@ -478,7 +331,14 @@ void CDockAreaTabBar::onCloseOtherTabsRequested()
 			int Offset = Tab->dockWidget()->features().testFlag(
 				CDockWidget::DockWidgetDeleteOnClose) ? 1 : 0;
 			closeTab(i);
-			i -= Offset;
+
+			// If the the dock widget blocks closing, i.e. if the flag
+			// CustomCloseHandling is set, and the dock widget is still open,
+			// then we do not need to correct the index
+			if (Tab->dockWidget()->isClosed())
+			{
+				i -= Offset;
+			}
 		}
 	}
 }
@@ -555,7 +415,6 @@ void CDockAreaTabBar::onTabWidgetMoved(const QPoint& GlobalPos)
 	}
 }
 
-
 //===========================================================================
 void CDockAreaTabBar::closeTab(int Index)
 {
@@ -569,7 +428,6 @@ void CDockAreaTabBar::closeTab(int Index)
 	{
 		return;
 	}
-	Tab->hide();
 	emit tabCloseRequested(Index);
 }
 
@@ -587,9 +445,15 @@ bool CDockAreaTabBar::eventFilter(QObject *watched, QEvent *event)
 	switch (event->type())
 	{
 	case QEvent::Hide:
-		 emit tabClosed(d->TabsLayout->indexOf(Tab)); break;
+		 emit tabClosed(d->TabsLayout->indexOf(Tab));
+		 updateGeometry();
+		 break;
+
 	case QEvent::Show:
-		 emit tabOpened(d->TabsLayout->indexOf(Tab)); break;
+		 emit tabOpened(d->TabsLayout->indexOf(Tab));
+		 updateGeometry();
+		 break;
+
 	default:
 		break;
 	}
@@ -614,7 +478,7 @@ bool CDockAreaTabBar::isTabOpen(int Index) const
 QSize CDockAreaTabBar::minimumSizeHint() const
 {
 	QSize Size = sizeHint();
-	Size.setWidth(Super::minimumSizeHint().width());// this defines the minimum width of a dock area
+	Size.setWidth(10);
 	return Size;
 }
 
@@ -622,19 +486,11 @@ QSize CDockAreaTabBar::minimumSizeHint() const
 //===========================================================================
 QSize CDockAreaTabBar::sizeHint() const
 {
-	QSize Size = Super::sizeHint();
-	Size.setHeight(d->TabsContainerWidget->sizeHint().height());
-	return Size;
-}
-
-
-//===========================================================================
-eDragState CDockAreaTabBar::dragState() const
-{
-	return d->DragState;
+	return d->TabsContainerWidget->sizeHint();
 }
 
 } // namespace ads
 
+
 //---------------------------------------------------------------------------
 // EOF DockAreaTabBar.cpp

src/DockAreaTabBar.h

@@ -67,42 +67,6 @@ private slots:
 protected:
 	virtual void wheelEvent(QWheelEvent* Event) override;
 
-	/**
-	 * Stores mouse position to detect dragging
-	 */
-	virtual void mousePressEvent(QMouseEvent* ev) override;
-
-	/**
-	 * Stores mouse position to detect dragging
-	 */
-	virtual void mouseReleaseEvent(QMouseEvent* ev) override;
-
-	/**
-	 * Starts floating the complete docking area including all dock widgets,
-	 * if it is not the last dock area in a floating widget
-	 */
-	virtual void mouseMoveEvent(QMouseEvent* ev) override;
-
-	/**
-	 * Double clicking the title bar also starts floating of the complete area
-	 */
-	virtual void mouseDoubleClickEvent(QMouseEvent *event) override;
-
-	/**
-	 * Starts floating
-	 */
-	void startFloating(const QPoint& Offset);
-
-	/**
-	 * Makes the dock area floating
-	 */
-	IFloatingWidget* makeAreaFloating(const QPoint& Offset, eDragState DragState);
-
-	/**
-	 * Returns the current drag state
-	 */
-	eDragState dragState() const;
-
 
 public:
 	using Super = QScrollArea;
@@ -239,6 +203,11 @@ signals:
 	 * This signal is emitted if a tab has been inserted
 	 */
 	void tabInserted(int index);
+
+	/**
+	 * This signal is emitted when a tab title elide state has been changed
+	 */
+	void elidedChanged(bool elided);
 }; // class CDockAreaTabBar
 } // namespace ads
 //-----------------------------------------------------------------------------

src/DockAreaTitleBar.cpp

@@ -37,9 +37,11 @@
 #include <QScrollArea>
 #include <QMouseEvent>
 #include <QDebug>
+#include <QPointer>
 
 #include "ads_globals.h"
 #include "FloatingDockContainer.h"
+#include "FloatingDragPreview.h"
 #include "DockAreaWidget.h"
 #include "DockOverlay.h"
 #include "DockManager.h"
@@ -47,26 +49,35 @@
 #include "DockWidgetTab.h"
 #include "DockAreaTabBar.h"
 #include "IconProvider.h"
+#include "DockComponentsFactory.h"
 
 #include <iostream>
 
 namespace ads
 {
-using tTileBarButton = QToolButton;
+using tTitleBarButton = QToolButton;
+
+
 /**
  * Private data class of CDockAreaTitleBar class (pimpl)
  */
 struct DockAreaTitleBarPrivate
 {
 	CDockAreaTitleBar* _this;
-	tTileBarButton* TabsMenuButton;
-	tTileBarButton* UndockButton;
-	tTileBarButton* CloseButton;
-	QBoxLayout* TopLayout;
+	QPointer<tTitleBarButton> TabsMenuButton;
+	QPointer<tTitleBarButton> UndockButton;
+	QPointer<tTitleBarButton> CloseButton;
+	QBoxLayout* Layout;
 	CDockAreaWidget* DockArea;
 	CDockAreaTabBar* TabBar;
 	bool MenuOutdated = true;
 	QMenu* TabsMenu;
+	QList<tTitleBarButton*> DockWidgetActionsButtons;
+
+	QPoint DragStartMousePos;
+	eDragState DragState = DraggingInactive;
+	IFloatingWidget* FloatingWidget = nullptr;
+
 
 	/**
 	 * Private data constructor
@@ -94,41 +105,110 @@ struct DockAreaTitleBarPrivate
 	/**
 	 * Returns true if the given config flag is set
 	 */
-	bool testConfigFlag(CDockManager::eConfigFlag Flag) const
+	static bool testConfigFlag(CDockManager::eConfigFlag Flag)
 	{
 		return CDockManager::configFlags().testFlag(Flag);
 	}
 
-    /**
-     * Helper function to set title bar button icons depending on operating
-     * system and to avoid duplicated code. On windows the standard icons
-     * are blurry since Qt 5.11 so we need to do some additional steps.
-     * If the global IconPovider of the dockmanager provides a custom
-     * Icon for the given CustomIconId, the this icon will be used.
-     */
-    void setTitleBarButtonIcon(tTileBarButton* Button, QStyle::StandardPixmap StandarPixmap,
-    	ads::eIcon CustomIconId)
-    {
-    	// First we try to use custom icons if available
-    	QIcon Icon = CDockManager::iconProvider().customIcon(CustomIconId);
-    	if (!Icon.isNull())
-    	{
-    		Button->setIcon(Icon);
-    		return;
-    	}
+	/**
+	 * Test function for current drag state
+	 */
+	bool isDraggingState(eDragState dragState) const
+	{
+		return this->DragState == dragState;
+	}
 
-    #ifdef Q_OS_LINUX
-        Button->setIcon(_this->style()->standardIcon(StandarPixmap));
-    #else
-        QPixmap normalPixmap = _this->style()->standardPixmap(StandarPixmap, 0, Button);
-        Icon.addPixmap(internal::createTransparentPixmap(normalPixmap, 0.25), QIcon::Disabled);
-        Icon.addPixmap(normalPixmap, QIcon::Normal);
-        Button->setIcon(Icon);
-    #endif
-    }
+
+	/**
+	 * Starts floating
+	 */
+	void startFloating(const QPoint& Offset);
+
+	/**
+	 * Makes the dock area floating
+	 */
+	IFloatingWidget* makeAreaFloating(const QPoint& Offset, eDragState DragState);
 };// struct DockAreaTitleBarPrivate
 
 
+/**
+ * Title bar button of a dock area that customizes tTitleBarButton appearance/behaviour
+ * according to various config flags such as:
+ * CDockManager::DockAreaHas_xxx_Button - if set to 'false' keeps the button always invisible
+ * CDockManager::DockAreaHideDisabledButtons - if set to 'true' hides button when it is disabled
+ */
+class CTitleBarButton : public tTitleBarButton
+{
+	Q_OBJECT
+	bool Visible = true;
+	bool HideWhenDisabled = false;
+public:
+	using Super = tTitleBarButton;
+	CTitleBarButton(bool visible = true, QWidget* parent = nullptr)
+		: tTitleBarButton(parent),
+		  Visible(visible),
+		  HideWhenDisabled(DockAreaTitleBarPrivate::testConfigFlag(CDockManager::DockAreaHideDisabledButtons))
+	{}
+	
+
+	/**
+	 * Adjust this visibility change request with our internal settings:
+	 */
+	virtual void setVisible(bool visible) override
+	{
+		// 'visible' can stay 'true' if and only if this button is configured to generaly visible:
+		visible = visible && this->Visible;
+
+		// 'visible' can stay 'true' unless: this button is configured to be invisible when it is disabled and it is currently disabled:
+		if(visible && HideWhenDisabled)
+		{
+			visible = isEnabled();
+		}
+
+		Super::setVisible(visible);
+	}
+	
+protected:
+	/**
+	 * Handle EnabledChanged signal to set button invisible if the configured
+	 */
+	bool event(QEvent *ev) override
+	{
+		if(QEvent::EnabledChange == ev->type() && HideWhenDisabled)
+		{
+			// force setVisible() call 
+			// Calling setVisible() directly here doesn't work well when button is expected to be shown first time
+			QMetaObject::invokeMethod(this, "setVisible", Qt::QueuedConnection, Q_ARG(bool, isEnabled()));
+		}
+
+		return Super::event(ev);
+	}
+};
+
+
+/**
+ * This spacer widget is here because of the following problem.
+ * The dock area title bar handles mouse dragging and moving the floating widget.
+ * The  problem is, that if the title bar becomes invisible, i.e. if the dock
+ * area contains only one single dock widget and the dock area is moved
+ * into a floating widget, then mouse events are not handled anymore and dragging
+ * of the floating widget stops.
+ */
+class CSpacerWidget : public QWidget
+{
+	Q_OBJECT
+public:
+	using Super = QWidget;
+	CSpacerWidget(QWidget* Parent = 0)
+	    : Super(Parent)
+	{
+	    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+	    setStyleSheet("border: none; background: none;");
+	}
+	virtual QSize sizeHint() const override {return QSize(0, 0);}
+	virtual QSize minimumSizeHint() const override {return QSize(0, 0);}
+};
+
 
 //============================================================================
 DockAreaTitleBarPrivate::DockAreaTitleBarPrivate(CDockAreaTitleBar* _public) :
@@ -142,61 +222,51 @@ DockAreaTitleBarPrivate::DockAreaTitleBarPrivate(CDockAreaTitleBar* _public) :
 void DockAreaTitleBarPrivate::createButtons()
 {
 	QSizePolicy ButtonSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
-    // Tabs menu button
-	TabsMenuButton = new tTileBarButton();
+
+	// Tabs menu button
+	TabsMenuButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasTabsMenuButton));
 	TabsMenuButton->setObjectName("tabsMenuButton");
 	TabsMenuButton->setAutoRaise(true);
 	TabsMenuButton->setPopupMode(QToolButton::InstantPopup);
-    setTitleBarButtonIcon(TabsMenuButton, QStyle::SP_TitleBarUnshadeButton, ads::DockAreaMenuIcon);
+	internal::setButtonIcon(TabsMenuButton, QStyle::SP_TitleBarUnshadeButton, ads::DockAreaMenuIcon);
 	QMenu* TabsMenu = new QMenu(TabsMenuButton);
 #ifndef QT_NO_TOOLTIP
 	TabsMenu->setToolTipsVisible(true);
 #endif
 	_this->connect(TabsMenu, SIGNAL(aboutToShow()), SLOT(onTabsMenuAboutToShow()));
 	TabsMenuButton->setMenu(TabsMenu);
-#ifndef QT_NO_TOOLTIP
-	TabsMenuButton->setToolTip(QObject::tr("List all tabs"));
-#endif
+	internal::setToolTip(TabsMenuButton, QObject::tr("List All Tabs"));
 	TabsMenuButton->setSizePolicy(ButtonSizePolicy);
-	TopLayout->addWidget(TabsMenuButton, 0);
+	Layout->addWidget(TabsMenuButton, 0);
 	_this->connect(TabsMenuButton->menu(), SIGNAL(triggered(QAction*)),
 		SLOT(onTabsMenuActionTriggered(QAction*)));
 
-
 	// Undock button
-	UndockButton = new tTileBarButton();
+	UndockButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasUndockButton));
 	UndockButton->setObjectName("undockButton");
 	UndockButton->setAutoRaise(true);
-#ifndef QT_NO_TOOLTIP
-	UndockButton->setToolTip(QObject::tr("Detach Group"));
-#endif
-    setTitleBarButtonIcon(UndockButton, QStyle::SP_TitleBarNormalButton, ads::DockAreaUndockIcon);
-    UndockButton->setSizePolicy(ButtonSizePolicy);
-	TopLayout->addWidget(UndockButton, 0);
+	internal::setToolTip(UndockButton, QObject::tr("Detach Group"));
+	internal::setButtonIcon(UndockButton, QStyle::SP_TitleBarNormalButton, ads::DockAreaUndockIcon);
+	UndockButton->setSizePolicy(ButtonSizePolicy);
+	Layout->addWidget(UndockButton, 0);
 	_this->connect(UndockButton, SIGNAL(clicked()), SLOT(onUndockButtonClicked()));
 
-
-    // Close button
-	CloseButton = new tTileBarButton();
+	// Close button
+	CloseButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasCloseButton));
 	CloseButton->setObjectName("closeButton");
 	CloseButton->setAutoRaise(true);
-    setTitleBarButtonIcon(CloseButton, QStyle::SP_TitleBarCloseButton, ads::DockAreaCloseIcon);
-#ifndef QT_NO_TOOLTIP
+	internal::setButtonIcon(CloseButton, QStyle::SP_TitleBarCloseButton, ads::DockAreaCloseIcon);
 	if (testConfigFlag(CDockManager::DockAreaCloseButtonClosesTab))
 	{
-		CloseButton->setToolTip(QObject::tr("Close Active Tab"));
+		internal::setToolTip(CloseButton, QObject::tr("Close Active Tab"));
 	}
 	else
 	{
-		CloseButton->setToolTip(QObject::tr("Close Group"));
+		internal::setToolTip(CloseButton, QObject::tr("Close Group"));
 	}
-#endif
 	CloseButton->setSizePolicy(ButtonSizePolicy);
 	CloseButton->setIconSize(QSize(16, 16));
-	if (testConfigFlag(CDockManager::DockAreaHasCloseButton))
-	{
-		TopLayout->addWidget(CloseButton, 0);
-	}
+	Layout->addWidget(CloseButton, 0);
 	_this->connect(CloseButton, SIGNAL(clicked()), SLOT(onCloseButtonClicked()));
 }
 
@@ -204,8 +274,9 @@ void DockAreaTitleBarPrivate::createButtons()
 //============================================================================
 void DockAreaTitleBarPrivate::createTabBar()
 {
-	TabBar = new CDockAreaTabBar(DockArea);
-	TopLayout->addWidget(TabBar);
+	TabBar = componentsFactory()->createDockAreaTabBar(DockArea);
+    TabBar->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Preferred);
+	Layout->addWidget(TabBar);
 	_this->connect(TabBar, SIGNAL(tabClosed(int)), SLOT(markTabsMenuOutdated()));
 	_this->connect(TabBar, SIGNAL(tabOpened(int)), SLOT(markTabsMenuOutdated()));
 	_this->connect(TabBar, SIGNAL(tabInserted(int)), SLOT(markTabsMenuOutdated()));
@@ -213,10 +284,51 @@ void DockAreaTitleBarPrivate::createTabBar()
 	_this->connect(TabBar, SIGNAL(tabMoved(int, int)), SLOT(markTabsMenuOutdated()));
 	_this->connect(TabBar, SIGNAL(currentChanged(int)), SLOT(onCurrentTabChanged(int)));
 	_this->connect(TabBar, SIGNAL(tabBarClicked(int)), SIGNAL(tabBarClicked(int)));
+	_this->connect(TabBar, SIGNAL(elidedChanged(bool)), SLOT(markTabsMenuOutdated()));
+}
 
-	TabBar->setContextMenuPolicy(Qt::CustomContextMenu);
-	_this->connect(TabBar, SIGNAL(customContextMenuRequested(const QPoint&)),
-		SLOT(showContextMenu(const QPoint&)));
+
+//============================================================================
+IFloatingWidget* DockAreaTitleBarPrivate::makeAreaFloating(const QPoint& Offset, eDragState DragState)
+{
+	QSize Size = DockArea->size();
+	this->DragState = DragState;
+	bool OpaqueUndocking = CDockManager::configFlags().testFlag(CDockManager::OpaqueUndocking) ||
+		(DraggingFloatingWidget != DragState);
+	CFloatingDockContainer* FloatingDockContainer = nullptr;
+	IFloatingWidget* FloatingWidget;
+	if (OpaqueUndocking)
+	{
+		FloatingWidget = FloatingDockContainer = new CFloatingDockContainer(DockArea);
+	}
+	else
+	{
+		auto w = new CFloatingDragPreview(DockArea);
+		QObject::connect(w, &CFloatingDragPreview::draggingCanceled, [=]()
+		{
+			this->DragState = DraggingInactive;
+		});
+		FloatingWidget = w;
+	}
+
+    FloatingWidget->startFloating(Offset, Size, DragState, nullptr);
+    if (FloatingDockContainer)
+    {
+		auto TopLevelDockWidget = FloatingDockContainer->topLevelDockWidget();
+		if (TopLevelDockWidget)
+		{
+			TopLevelDockWidget->emitTopLevelChanged(true);
+		}
+    }
+
+	return FloatingWidget;
+}
+
+
+//============================================================================
+void DockAreaTitleBarPrivate::startFloating(const QPoint& Offset)
+{
+	FloatingWidget = makeAreaFloating(Offset, DraggingFloatingWidget);
 }
 
 
@@ -228,21 +340,35 @@ CDockAreaTitleBar::CDockAreaTitleBar(CDockAreaWidget* parent) :
 	d->DockArea = parent;
 
 	setObjectName("dockAreaTitleBar");
-	d->TopLayout = new QBoxLayout(QBoxLayout::LeftToRight);
-	d->TopLayout->setContentsMargins(0, 0, 0, 0);
-	d->TopLayout->setSpacing(0);
-	setLayout(d->TopLayout);
-	setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
+	d->Layout = new QBoxLayout(QBoxLayout::LeftToRight);
+	d->Layout->setContentsMargins(0, 0, 0, 0);
+	d->Layout->setSpacing(0);
+	setLayout(d->Layout);
+	setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 
 	d->createTabBar();
+	d->Layout->addWidget(new CSpacerWidget(this));
 	d->createButtons();
-
 }
 
 
 //============================================================================
 CDockAreaTitleBar::~CDockAreaTitleBar()
 {
+	if (!d->CloseButton.isNull())
+	{
+		delete d->CloseButton;
+	}
+
+	if (!d->TabsMenuButton.isNull())
+	{
+		delete d->TabsMenuButton;
+	}
+
+	if (!d->UndockButton.isNull())
+	{
+		delete d->UndockButton;
+	}
 	delete d;
 }
 
@@ -253,14 +379,31 @@ CDockAreaTabBar* CDockAreaTitleBar::tabBar() const
 	return d->TabBar;
 }
 
-
 //============================================================================
 void CDockAreaTitleBar::markTabsMenuOutdated()
 {
+	if(DockAreaTitleBarPrivate::testConfigFlag(CDockManager::DockAreaDynamicTabsMenuButtonVisibility))
+	{
+		bool hasElidedTabTitle = false;
+		for (int i = 0; i < d->TabBar->count(); ++i)
+		{
+			if (!d->TabBar->isTabOpen(i))
+			{
+				continue;
+			}
+			CDockWidgetTab* Tab = d->TabBar->tab(i);
+			if(Tab->isTitleElided())
+			{
+				hasElidedTabTitle = true;
+				break;
+			}
+		}
+		bool visible = (hasElidedTabTitle && (d->TabBar->count() > 1));
+		QMetaObject::invokeMethod(d->TabsMenuButton, "setVisible", Qt::QueuedConnection, Q_ARG(bool, visible));
+	}
 	d->MenuOutdated = true;
 }
 
-
 //============================================================================
 void CDockAreaTitleBar::onTabsMenuAboutToShow()
 {
@@ -279,9 +422,7 @@ void CDockAreaTitleBar::onTabsMenuAboutToShow()
 		}
 		auto Tab = d->TabBar->tab(i);
 		QAction* Action = menu->addAction(Tab->icon(), Tab->text());
-		#ifndef QT_NO_TOOLTIP
-		Action->setToolTip(Tab->toolTip());
-		#endif
+		internal::setToolTip(Action, Tab->toolTip());
 		Action->setData(i);
 	}
 
@@ -309,7 +450,7 @@ void CDockAreaTitleBar::onUndockButtonClicked()
 {
 	if (d->DockArea->features().testFlag(CDockWidget::DockWidgetFloatable))
 	{
-		d->TabBar->makeAreaFloating(mapFromGlobal(QCursor::pos()), DraggingInactive);
+		d->makeAreaFloating(mapFromGlobal(QCursor::pos()), DraggingInactive);
 	}
 }
 
@@ -323,6 +464,40 @@ void CDockAreaTitleBar::onTabsMenuActionTriggered(QAction* Action)
 }
 
 
+//============================================================================
+void CDockAreaTitleBar::updateDockWidgetActionsButtons()
+{
+	CDockWidget* DockWidget = d->TabBar->currentTab()->dockWidget();
+	if (!d->DockWidgetActionsButtons.isEmpty())
+	{
+		for (auto Button : d->DockWidgetActionsButtons)
+		{
+			d->Layout->removeWidget(Button);
+			delete Button;
+		}
+		d->DockWidgetActionsButtons.clear();
+	}
+
+	auto Actions = DockWidget->titleBarActions();
+	if (Actions.isEmpty())
+	{
+		return;
+	}
+
+	int InsertIndex = indexOf(d->TabsMenuButton);
+	for (auto Action : Actions)
+	{
+		auto Button = new CTitleBarButton(true, this);
+		Button->setDefaultAction(Action);
+		Button->setAutoRaise(true);
+		Button->setPopupMode(QToolButton::InstantPopup);
+		Button->setObjectName(Action->objectName());
+		d->Layout->insertWidget(InsertIndex++, Button, 0);
+		d->DockWidgetActionsButtons.append(Button);
+	}
+}
+
+
 //============================================================================
 void CDockAreaTitleBar::onCurrentTabChanged(int Index)
 {
@@ -336,6 +511,8 @@ void CDockAreaTitleBar::onCurrentTabChanged(int Index)
 		CDockWidget* DockWidget = d->TabBar->tab(Index)->dockWidget();
 		d->CloseButton->setEnabled(DockWidget->features().testFlag(CDockWidget::DockWidgetClosable));
 	}
+
+	updateDockWidgetActionsButtons();
 }
 
 
@@ -362,9 +539,113 @@ void CDockAreaTitleBar::setVisible(bool Visible)
 
 
 //============================================================================
-void CDockAreaTitleBar::showContextMenu(const QPoint& pos)
+void CDockAreaTitleBar::mousePressEvent(QMouseEvent* ev)
 {
-	if (d->TabBar->dragState() == DraggingFloatingWidget)
+	if (ev->button() == Qt::LeftButton)
+	{
+		ev->accept();
+		d->DragStartMousePos = ev->pos();
+		d->DragState = DraggingMousePressed;
+		return;
+	}
+	Super::mousePressEvent(ev);
+}
+
+
+//============================================================================
+void CDockAreaTitleBar::mouseReleaseEvent(QMouseEvent* ev)
+{
+	if (ev->button() == Qt::LeftButton)
+	{
+        ADS_PRINT("CDockAreaTitleBar::mouseReleaseEvent");
+		ev->accept();
+		auto CurrentDragState = d->DragState;
+		d->DragStartMousePos = QPoint();
+		d->DragState = DraggingInactive;
+		if (DraggingFloatingWidget == CurrentDragState)
+		{
+			d->FloatingWidget->finishDragging();
+		}
+		return;
+	}
+	Super::mouseReleaseEvent(ev);
+}
+
+
+//============================================================================
+void CDockAreaTitleBar::mouseMoveEvent(QMouseEvent* ev)
+{
+	Super::mouseMoveEvent(ev);
+	if (!(ev->buttons() & Qt::LeftButton) || d->isDraggingState(DraggingInactive))
+	{
+		d->DragState = DraggingInactive;
+		return;
+	}
+
+    // move floating window
+    if (d->isDraggingState(DraggingFloatingWidget))
+    {
+        d->FloatingWidget->moveFloating();
+        return;
+    }
+
+	// If this is the last dock area in a dock container it does not make
+	// sense to move it to a new floating widget and leave this one
+	// empty
+	if (d->DockArea->dockContainer()->isFloating()
+	 && d->DockArea->dockContainer()->visibleDockAreaCount() == 1)
+	{
+		return;
+	}
+
+	// If one single dock widget in this area is not floatable then the whole
+	// area is not floatable
+	// If we do non opaque undocking, then we can create the floating drag
+	// preview if the dock widget is movable
+	auto Features = d->DockArea->features();
+    if (!Features.testFlag(CDockWidget::DockWidgetFloatable)
+    && !(Features.testFlag(CDockWidget::DockWidgetMovable) && !CDockManager::testConfigFlag(CDockManager::OpaqueUndocking)))
+	{
+		return;
+	}
+
+	int DragDistance = (d->DragStartMousePos - ev->pos()).manhattanLength();
+	if (DragDistance >= CDockManager::startDragDistance())
+	{
+        ADS_PRINT("CTabsScrollArea::startFloating");
+		d->startFloating(d->DragStartMousePos);
+		auto Overlay = d->DockArea->dockManager()->containerOverlay();
+		Overlay->setAllowedAreas(OuterDockAreas);
+	}
+
+	return;
+}
+
+
+//============================================================================
+void CDockAreaTitleBar::mouseDoubleClickEvent(QMouseEvent *event)
+{
+	// If this is the last dock area in a dock container it does not make
+	// sense to move it to a new floating widget and leave this one
+	// empty
+	if (d->DockArea->dockContainer()->isFloating() && d->DockArea->dockContainer()->dockAreaCount() == 1)
+	{
+		return;
+	}
+
+	if (!d->DockArea->features().testFlag(CDockWidget::DockWidgetFloatable))
+	{
+		return;
+	}
+	d->makeAreaFloating(event->pos(), DraggingInactive);
+}
+
+
+//============================================================================
+void CDockAreaTitleBar::contextMenuEvent(QContextMenuEvent* ev)
+{
+	ev->accept();
+	if (d->isDraggingState(DraggingFloatingWidget))
 	{
 		return;
 	}
@@ -376,11 +657,27 @@ void CDockAreaTitleBar::showContextMenu(const QPoint& pos)
 	Action = Menu.addAction(tr("Close Area"), this, SLOT(onCloseButtonClicked()));
 	Action->setEnabled(d->DockArea->features().testFlag(CDockWidget::DockWidgetClosable));
 	Menu.addAction(tr("Close Other Areas"), d->DockArea, SLOT(closeOtherAreas()));
-	Menu.exec(mapToGlobal(pos));
+	Menu.exec(ev->globalPos());
+}
+
+
+//============================================================================
+void CDockAreaTitleBar::insertWidget(int index, QWidget *widget)
+{
+	d->Layout->insertWidget(index, widget);
+}
+
+
+//============================================================================
+int CDockAreaTitleBar::indexOf(QWidget *widget) const
+{
+	return d->Layout->indexOf(widget);
 }
 
 
 } // namespace ads
 
+#include "DockAreaTitleBar.moc"
+
 //---------------------------------------------------------------------------
 // EOF DockAreaTitleBar.cpp

src/DockAreaTitleBar.h

@@ -60,7 +60,33 @@ private slots:
 	void onUndockButtonClicked();
 	void onTabsMenuActionTriggered(QAction* Action);
 	void onCurrentTabChanged(int Index);
-	void showContextMenu(const QPoint& pos);
+
+protected:
+		/**
+	 * Stores mouse position to detect dragging
+	 */
+	virtual void mousePressEvent(QMouseEvent* ev) override;
+
+	/**
+	 * Stores mouse position to detect dragging
+	 */
+	virtual void mouseReleaseEvent(QMouseEvent* ev) override;
+
+	/**
+	 * Starts floating the complete docking area including all dock widgets,
+	 * if it is not the last dock area in a floating widget
+	 */
+	virtual void mouseMoveEvent(QMouseEvent* ev) override;
+
+	/**
+	 * Double clicking the title bar also starts floating of the complete area
+	 */
+	virtual void mouseDoubleClickEvent(QMouseEvent *event) override;
+
+	/**
+	 * Show context menu
+	 */
+	virtual void contextMenuEvent(QContextMenuEvent *event);
 
 public slots:
 	/**
@@ -72,6 +98,7 @@ public slots:
 
 public:
 	using Super = QFrame;
+
 	/**
 	 * Default Constructor
 	 */
@@ -92,12 +119,34 @@ public:
 	 */
 	QAbstractButton* button(TitleBarButton which) const;
 
+	/**
+	 * Updates the visibility of the dock widget actions in the title bar
+	 */
+	void updateDockWidgetActionsButtons();
+
 	/**
 	 * Marks the tabs menu outdated before it calls its base class
 	 * implementation
 	 */
 	virtual void setVisible(bool Visible) override;
 
+	/**
+	 * Inserts a custom widget at position index into this title bar.
+	 * If index is negative, the widget is added at the end.
+	 * You can use this function to insert custom widgets into the title bar.
+	 */
+	void insertWidget(int index, QWidget *widget);
+
+	/**
+	 * Searches for widget widget in this title bar.
+	 * You can use this function, to get the position of the default
+	 * widget in the tile bar.
+	 * \code
+	 * int tabBarIndex = TitleBar->indexOf(TitleBar->tabBar());
+	 * int closeButtonIndex = TitleBar->indexOf(TitleBar->button(TitleBarButtonClose));
+	 * \endcode
+	 */
+	int indexOf(QWidget *widget) const;
 
 signals:
 	/**

src/DockAreaWidget.cpp

@@ -28,9 +28,10 @@
 //============================================================================
 //                                   INCLUDES
 //============================================================================
-#include "DockWidgetTab.h"
 #include "DockAreaWidget.h"
 
+#include <iostream>
+
 #include <QStackedLayout>
 #include <QScrollBar>
 #include <QScrollArea>
@@ -53,8 +54,8 @@
 #include "DockAreaTabBar.h"
 #include "DockSplitter.h"
 #include "DockAreaTitleBar.h"
-
-#include <iostream>
+#include "DockComponentsFactory.h"
+#include "DockWidgetTab.h"
 
 
 namespace ads
@@ -245,6 +246,7 @@ struct DockAreaWidgetPrivate
 	CDockAreaTitleBar*	TitleBar		= nullptr;
 	CDockManager*		DockManager		= nullptr;
 	bool UpdateTitleBarButtons = false;
+	DockWidgetAreas		AllowedAreas	= AllDockAreas;
 
 	/**
 	 * Private data constructor
@@ -261,7 +263,7 @@ struct DockAreaWidgetPrivate
 	 */
 	CDockWidget* dockWidgetAt(int index)
 	{
-		return dynamic_cast<CDockWidget*>(ContentsLayout->widget(index));
+		return qobject_cast<CDockWidget*>(ContentsLayout->widget(index));
 	}
 
 	/**
@@ -316,7 +318,7 @@ DockAreaWidgetPrivate::DockAreaWidgetPrivate(CDockAreaWidget* _public) :
 //============================================================================
 void DockAreaWidgetPrivate::createTitleBar()
 {
-	TitleBar = new CDockAreaTitleBar(_this);
+	TitleBar = componentsFactory()->createDockAreaTitleBar(_this);
 	Layout->addWidget(TitleBar);
 	QObject::connect(tabBar(), &CDockAreaTabBar::tabCloseRequested, _this, &CDockAreaWidget::onTabCloseRequested);
 	QObject::connect(TitleBar, &CDockAreaTitleBar::tabBarClicked, _this, &CDockAreaWidget::setCurrentIndex);
@@ -337,6 +339,7 @@ void DockAreaWidgetPrivate::updateTitleBarButtonStates()
 		_this->features().testFlag(CDockWidget::DockWidgetClosable));
 	TitleBar->button(TitleBarButtonUndock)->setEnabled(
 		_this->features().testFlag(CDockWidget::DockWidgetFloatable));
+	TitleBar->updateDockWidgetActionsButtons();
 	UpdateTitleBarButtons = false;
 }
 
@@ -494,7 +497,8 @@ void CDockAreaWidget::onTabCloseRequested(int Index)
     auto* DockWidget = dockWidget(Index);
     if (DockWidget->features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
     {
-    	DockWidget->deleteDockWidget();
+    	//DockWidget->deleteDockWidget();
+    	DockWidget->closeDockWidgetInternal();
     }
     else
     {
@@ -551,6 +555,13 @@ void CDockAreaWidget::setCurrentIndex(int index)
 		return;
     }
 
+	auto cw = d->ContentsLayout->currentWidget();
+	auto nw = d->ContentsLayout->widget(index);
+	if (cw == nw && !nw->isHidden())
+	{
+		return;
+	}
+
     emit currentChanging(index);
     TabBar->setCurrentIndex(index);
 	d->ContentsLayout->setCurrentIndex(index);
@@ -694,6 +705,11 @@ void CDockAreaWidget::updateTitleBarVisibility()
 		return;
 	}
 
+    if (CDockManager::configFlags().testFlag(CDockManager::AlwaysShowTabs))
+    {
+        return;
+    }
+
 	if (d->TitleBar)
 	{
 		d->TitleBar->setVisible(!Container->isFloating() || !Container->hasTopLevelDockWidget());
@@ -757,15 +773,26 @@ CDockWidget* CDockAreaWidget::nextOpenDockWidget(CDockWidget* DockWidget) const
 
 
 //============================================================================
-CDockWidget::DockWidgetFeatures CDockAreaWidget::features() const
+CDockWidget::DockWidgetFeatures CDockAreaWidget::features(eBitwiseOperator Mode) const
 {
-	CDockWidget::DockWidgetFeatures Features(CDockWidget::AllDockWidgetFeatures);
-	for (const auto DockWidget : dockWidgets())
+	if (BitwiseAnd == Mode)
 	{
-		Features &= DockWidget->features();
+		CDockWidget::DockWidgetFeatures Features(CDockWidget::AllDockWidgetFeatures);
+		for (const auto DockWidget : dockWidgets())
+		{
+			Features &= DockWidget->features();
+		}
+		return Features;
+	}
+	else
+	{
+		CDockWidget::DockWidgetFeatures Features(CDockWidget::NoDockWidgetFeatures);
+		for (const auto DockWidget : dockWidgets())
+		{
+			Features |= DockWidget->features();
+		}
+		return Features;
 	}
-
-	return Features;
 }
 
 
@@ -788,6 +815,15 @@ void CDockAreaWidget::setVisible(bool Visible)
 	}
 }
 
+void CDockAreaWidget::setAllowedAreas(DockWidgetAreas areas)
+{
+	d->AllowedAreas = areas;
+}
+
+DockWidgetAreas CDockAreaWidget::allowedAreas() const
+{
+	return d->AllowedAreas;
+}
 
 //============================================================================
 QAbstractButton* CDockAreaWidget::titleBarButton(TitleBarButton which) const
@@ -804,7 +840,7 @@ void CDockAreaWidget::closeArea()
 	auto OpenDockWidgets = openedDockWidgets();
 	if (OpenDockWidgets.count() == 1 && OpenDockWidgets[0]->features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
 	{
-		OpenDockWidgets[0]->deleteDockWidget();
+		OpenDockWidgets[0]->closeDockWidgetInternal();
 	}
 	else
 	{
@@ -821,6 +857,13 @@ void CDockAreaWidget::closeOtherAreas()
 {
 	dockContainer()->closeOtherAreas(this);
 }
+
+
+//============================================================================
+CDockAreaTitleBar* CDockAreaWidget::titleBar() const
+{
+	return d->TitleBar;
+}
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockAreaWidget.h

@@ -44,6 +44,7 @@ struct DockAreaWidgetPrivate;
 class CDockManager;
 class CDockContainerWidget;
 class DockContainerWidgetPrivate;
+class CDockAreaTitleBar;
 
 
 /**
@@ -238,10 +239,10 @@ public:
 	 * A bitwise and is used to combine the flags of all dock widgets. That
 	 * means, if only one single dock widget does not support a certain flag,
 	 * the whole dock are does not support the flag. I.e. if one single
-	 * dock widget in this area is not closabe, the whole dock are is not
+	 * dock widget in this area is not closable, the whole dock are is not
 	 * closable.
 	 */
-	CDockWidget::DockWidgetFeatures features() const;
+	CDockWidget::DockWidgetFeatures features(eBitwiseOperator Mode = BitwiseAnd) const;
 
 	/**
 	 * Returns the title bar button corresponding to the given title bar
@@ -254,6 +255,21 @@ public:
 	 */
 	virtual void setVisible(bool Visible) override;
 
+	/**
+	 * Configures the areas of this particular dock area that are allowed for docking
+	 */
+	void setAllowedAreas(DockWidgetAreas areas);
+
+	/**
+	 * Returns flags with all allowed drop areas of this particular dock area
+	 */
+	DockWidgetAreas allowedAreas() const;
+
+	/**
+	 * Returns the title bar of this dock area
+	 */
+	CDockAreaTitleBar* titleBar() const;
+
 public slots:
 	/**
 	 * This activates the tab for the given tab index.

src/DockComponentsFactory.cpp

@@ -0,0 +1,69 @@
+//============================================================================
+/// \file   DockComponentsFactory.cpp
+/// \author Uwe Kindler
+/// \date   10.02.2020
+/// \brief  Implementation of DockComponentsFactory
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include <DockComponentsFactory.h>
+
+#include <memory>
+
+#include "DockWidgetTab.h"
+#include "DockAreaTabBar.h"
+#include "DockAreaTitleBar.h"
+#include "DockWidget.h"
+#include "DockAreaWidget.h"
+
+namespace ads
+{
+static std::unique_ptr<CDockComponentsFactory> DefaultFactory(new CDockComponentsFactory());
+
+
+//============================================================================
+CDockWidgetTab* CDockComponentsFactory::createDockWidgetTab(CDockWidget* DockWidget) const
+{
+	return new CDockWidgetTab(DockWidget);
+}
+
+
+//============================================================================
+CDockAreaTabBar* CDockComponentsFactory::createDockAreaTabBar(CDockAreaWidget* DockArea) const
+{
+	return new CDockAreaTabBar(DockArea);
+}
+
+
+//============================================================================
+CDockAreaTitleBar* CDockComponentsFactory::createDockAreaTitleBar(CDockAreaWidget* DockArea) const
+{
+	return new CDockAreaTitleBar(DockArea);
+}
+
+
+//============================================================================
+const CDockComponentsFactory* CDockComponentsFactory::factory()
+{
+	return DefaultFactory.get();
+}
+
+
+//============================================================================
+void CDockComponentsFactory::setFactory(CDockComponentsFactory* Factory)
+{
+	DefaultFactory.reset(Factory);
+}
+
+
+//============================================================================
+void CDockComponentsFactory::resetDefaultFactory()
+{
+	DefaultFactory.reset(new CDockComponentsFactory());
+}
+} // namespace ads
+
+//---------------------------------------------------------------------------
+// EOF DockComponentsFactory.cpp

src/DockComponentsFactory.h

@@ -0,0 +1,90 @@
+#ifndef DockComponentsFactoryH
+#define DockComponentsFactoryH
+//============================================================================
+/// \file   DockComponentsFactory.h
+/// \author Uwe Kindler
+/// \date   10.02.2020
+/// \brief  Declaration of DockComponentsFactory
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include "ads_globals.h"
+
+namespace ads
+{
+class CDockWidgetTab;
+class CDockAreaTitleBar;
+class CDockAreaTabBar;
+class CDockAreaWidget;
+class CDockWidget;
+
+
+
+/**
+ * Factory for creation of certain GUI elements for the docking framework.
+ * A default unique instance provided by CDockComponentsFactory is used for
+ * creation of all supported components. To inject your custom components,
+ * you can create your own derived dock components factory and register
+ * it via setDefaultFactory() function.
+ * \code
+ * CDockComponentsFactory::setDefaultFactory(new MyComponentsFactory()));
+ * \endcode
+ */
+class ADS_EXPORT CDockComponentsFactory
+{
+public:
+	/**
+	 * Force virtual destructor
+	 */
+	virtual ~CDockComponentsFactory() {}
+
+	/**
+	 * This default implementation just creates a dock widget tab with
+	 * new CDockWidgetTab(DockWIdget).
+	 */
+	virtual CDockWidgetTab* createDockWidgetTab(CDockWidget* DockWidget) const;
+
+	/**
+	 * This default implementation just creates a dock area tab bar with
+	 * new CDockAreaTabBar(DockArea).
+	 */
+	virtual CDockAreaTabBar* createDockAreaTabBar(CDockAreaWidget* DockArea) const;
+
+	/**
+	 * This default implementation just creates a dock area title bar with
+	 * new CDockAreaTitleBar(DockArea).
+	 */
+	virtual CDockAreaTitleBar* createDockAreaTitleBar(CDockAreaWidget* DockArea) const;
+
+	/**
+	 * Returns the default components factory
+	 */
+	static const CDockComponentsFactory* factory();
+
+	/**
+	 * Sets a new default factory for creation of GUI elements.
+	 * This function takes ownership of the given Factory.
+	 */
+	static void setFactory(CDockComponentsFactory* Factory);
+
+	/**
+	 * Resets the current factory to the
+	 */
+	static void resetDefaultFactory();
+};
+
+
+/**
+ * Convenience function to ease factory instance access
+ */
+inline const CDockComponentsFactory* componentsFactory()
+{
+	return CDockComponentsFactory::factory();
+}
+
+} // namespace ads
+
+//---------------------------------------------------------------------------
+#endif // DockComponentsFactoryH

src/DockContainerWidget.cpp

@@ -334,7 +334,7 @@ eDropMode DockContainerWidgetPrivate::getDropMode(const QPoint& TargetPos)
 	if (DockArea)
 	{
 		auto dropOverlay = DockManager->dockAreaOverlay();
-		dropOverlay->setAllowedAreas(AllDockAreas);
+		dropOverlay->setAllowedAreas(DockArea->allowedAreas());
 		dropArea = dropOverlay->showOverlay(DockArea);
 		if (ContainerDropArea != InvalidDockWidgetArea &&
 			ContainerDropArea != dropArea)
@@ -736,7 +736,7 @@ void DockContainerWidgetPrivate::appendDockAreas(const QList<CDockAreaWidget*> N
 //============================================================================
 void DockContainerWidgetPrivate::saveChildNodesState(QXmlStreamWriter& s, QWidget* Widget)
 {
-	QSplitter* Splitter = dynamic_cast<QSplitter*>(Widget);
+	QSplitter* Splitter = qobject_cast<QSplitter*>(Widget);
 	if (Splitter)
 	{
 		s.writeStartElement("Splitter");
@@ -759,7 +759,7 @@ void DockContainerWidgetPrivate::saveChildNodesState(QXmlStreamWriter& s, QWidge
 	}
 	else
 	{
-		CDockAreaWidget* DockArea = dynamic_cast<CDockAreaWidget*>(Widget);
+		CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(Widget);
 		if (DockArea)
 		{
 			DockArea->saveState(s);
@@ -1046,7 +1046,7 @@ void DockContainerWidgetPrivate::addDockArea(CDockAreaWidget* NewDockArea, DockW
 void DockContainerWidgetPrivate::dumpRecursive(int level, QWidget* widget)
 {
 #if defined(QT_DEBUG)
-	QSplitter* Splitter = dynamic_cast<QSplitter*>(widget);
+	QSplitter* Splitter = qobject_cast<QSplitter*>(widget);
 	QByteArray buf;
     buf.fill(' ', level * 4);
 	if (Splitter)
@@ -1069,7 +1069,7 @@ void DockContainerWidgetPrivate::dumpRecursive(int level, QWidget* widget)
 	}
 	else
 	{
-		CDockAreaWidget* DockArea = dynamic_cast<CDockAreaWidget*>(widget);
+		CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(widget);
 		if (!DockArea)
 		{
 			return;
@@ -1285,7 +1285,7 @@ void CDockContainerWidget::removeDockArea(CDockAreaWidget* area)
 		}
 
 		QWidget* widget = Splitter->widget(0);
-		QSplitter* ChildSplitter = dynamic_cast<QSplitter*>(widget);
+		QSplitter* ChildSplitter = qobject_cast<QSplitter*>(widget);
 		// If the one and only content widget of the splitter is not a splitter
 		// then we are finished
 		if (!ChildSplitter)
@@ -1392,7 +1392,7 @@ void CDockContainerWidget::dropFloatingWidget(CFloatingDockContainer* FloatingWi
 	if (DockArea)
 	{
 		auto dropOverlay = d->DockManager->dockAreaOverlay();
-		dropOverlay->setAllowedAreas(AllDockAreas);
+		dropOverlay->setAllowedAreas(DockArea->allowedAreas());
 		dropArea = dropOverlay->showOverlay(DockArea);
 		if (ContainerDropArea != InvalidDockWidgetArea &&
 			ContainerDropArea != dropArea)
@@ -1447,7 +1447,7 @@ void CDockContainerWidget::dropWidget(QWidget* Widget, const QPoint& TargetPos)
 	if (DockArea)
 	{
 		auto dropOverlay = d->DockManager->dockAreaOverlay();
-		dropOverlay->setAllowedAreas(AllDockAreas);
+		dropOverlay->setAllowedAreas(DockArea->allowedAreas());
 		dropArea = dropOverlay->showOverlay(DockArea);
 		if (ContainerDropArea != InvalidDockWidgetArea &&
 			ContainerDropArea != dropArea)
@@ -1573,7 +1573,7 @@ bool CDockContainerWidget::restoreState(CDockingStateReader& s, bool Testing)
 
 	d->Layout->replaceWidget(d->RootSplitter, NewRootSplitter);
 	QSplitter* OldRoot = d->RootSplitter;
-	d->RootSplitter = dynamic_cast<QSplitter*>(NewRootSplitter);
+	d->RootSplitter = qobject_cast<QSplitter*>(NewRootSplitter);
 	OldRoot->deleteLater();
 
 	return true;
@@ -1713,10 +1713,23 @@ void CDockContainerWidget::closeOtherAreas(CDockAreaWidget* KeepOpenArea)
 {
 	for (const auto DockArea : d->DockAreas)
 	{
-		if (DockArea != KeepOpenArea && DockArea->features().testFlag(CDockWidget::DockWidgetClosable))
+		if (DockArea == KeepOpenArea)
 		{
-			DockArea->closeArea();
+			continue;
 		}
+
+		if (!DockArea->features(BitwiseAnd).testFlag(CDockWidget::DockWidgetClosable))
+		{
+			continue;
+		}
+
+		// We do not close areas with widgets with custom close handling
+		if (DockArea->features(BitwiseOr).testFlag(CDockWidget::CustomCloseHandling))
+		{
+			continue;
+		}
+
+		DockArea->closeArea();
 	}
 }
 

src/DockContainerWidget.h

@@ -130,14 +130,6 @@ protected:
 	 */
 	CDockAreaWidget* lastAddedDockAreaWidget(DockWidgetArea area) const;
 
-	/**
-	 * This function returns true if this dock area has only one single
-	 * visible dock widget.
-	 * A top level widget is a real floating widget. Only the isFloating()
-	 * function of top level widgets may returns true.
-	 */
-	bool hasTopLevelDockWidget() const;
-
 	/**
 	 * If hasSingleVisibleDockWidget() returns true, this function returns the
 	 * one and only visible dock widget. Otherwise it returns a nullptr.
@@ -214,6 +206,14 @@ public:
 	 */
 	QList<CDockAreaWidget*> openedDockAreas() const;
 
+    /**
+     * This function returns true if this dock area has only one single
+     * visible dock widget.
+     * A top level widget is a real floating widget. Only the isFloating()
+     * function of top level widgets may returns true.
+     */
+    bool hasTopLevelDockWidget() const;
+
 	/**
 	 * Returns the number of dock areas in this container
 	 */

src/DockManager.cpp

@@ -58,7 +58,7 @@
 
 namespace ads
 {
-static CDockManager::ConfigFlags StaticConfigFlags = CDockManager::DefaultConfig;
+static CDockManager::ConfigFlags StaticConfigFlags = CDockManager::DefaultNonOpaqueConfig;
 
 /**
  * Private data class of CDockManager class (pimpl)
@@ -411,7 +411,7 @@ CDockManager::CDockManager(QWidget *parent) :
 	d(new DockManagerPrivate(this))
 {
 	createRootSplitter();
-	QMainWindow* MainWindow = dynamic_cast<QMainWindow*>(parent);
+	QMainWindow* MainWindow = qobject_cast<QMainWindow*>(parent);
 	if (MainWindow)
 	{
 		MainWindow->setCentralWidget(this);
@@ -440,6 +440,7 @@ CDockManager::~CDockManager()
 void CDockManager::registerFloatingWidget(CFloatingDockContainer* FloatingWidget)
 {
 	d->FloatingWidgets.append(FloatingWidget);
+	emit floatingWidgetCreated(FloatingWidget);
     ADS_PRINT("d->FloatingWidgets.count() " << d->FloatingWidgets.count());
 }
 
@@ -837,6 +838,12 @@ void CDockManager::setConfigFlag(eConfigFlag Flag, bool On)
 	internal::setFlag(StaticConfigFlags, Flag, On);
 }
 
+//===========================================================================
+bool CDockManager::testConfigFlag(eConfigFlag Flag)
+{
+    return configFlags().testFlag(Flag);
+}
+
 
 //===========================================================================
 CIconProvider& CDockManager::iconProvider()

src/DockManager.h

@@ -59,6 +59,7 @@ class CDockWidgetTab;
 struct DockWidgetTabPrivate;
 struct DockAreaWidgetPrivate;
 class CIconProvider;
+class CDockComponentsFactory;
 
 /**
  * The central dock manager that maintains the complete docking system.
@@ -88,6 +89,7 @@ private:
 	friend struct DockWidgetTabPrivate;
 	friend class CFloatingDragPreview;
 	friend struct FloatingDragPreviewPrivate;
+	friend class CDockAreaTitleBar;
 
 protected:
 	/**
@@ -145,7 +147,7 @@ public:
 	{
 		ActiveTabHasCloseButton = 0x0001,    //!< If this flag is set, the active tab in a tab area has a close button
 		DockAreaHasCloseButton = 0x0002,     //!< If the flag is set each dock area has a close button
-		DockAreaCloseButtonClosesTab = 0x0004,//!< If the flag is set, the dock area close button closes the active tab, if not set, it closes the complete cock area
+		DockAreaCloseButtonClosesTab = 0x0004,//!< If the flag is set, the dock area close button closes the active tab, if not set, it closes the complete dock area
 		OpaqueSplitterResize = 0x0008, //!< See QSplitter::setOpaqueResize() documentation
 		XmlAutoFormattingEnabled = 0x0010,//!< If enabled, the XML writer automatically adds line-breaks and indentation to empty sections between elements (ignorable whitespace).
 		XmlCompressionEnabled = 0x0020,//!< If enabled, the XML output will be compressed and is not human readable anymore
@@ -156,19 +158,32 @@ public:
 		DragPreviewIsDynamic = 0x0400,///< If opaque undocking is disabled, this flag defines the behavior of the drag preview window, if this flag is enabled, the preview will be adjusted dynamically to the drop area
 		DragPreviewShowsContentPixmap = 0x0800,///< If opaque undocking is disabled, the created drag preview window shows a copy of the content of the dock widget / dock are that is dragged
 		DragPreviewHasWindowFrame = 0x1000,///< If opaque undocking is disabled, then this flag configures if the drag preview is frameless or looks like a real window
-		DefaultConfig = ActiveTabHasCloseButton
-		              | DockAreaHasCloseButton
-		              | OpaqueSplitterResize
-		              | XmlCompressionEnabled
-		              | OpaqueUndocking, ///< the default configuration
-		DefaultNonOpaqueConfig = ActiveTabHasCloseButton
-		              | DockAreaHasCloseButton
-		              | XmlCompressionEnabled
+		AlwaysShowTabs = 0x2000,///< If this option is enabled, the tab of a dock widget is always displayed - even if it is the only visible dock widget in a floating widget.
+		DockAreaHasUndockButton = 0x4000,     //!< If the flag is set each dock area has an undock button
+		DockAreaHasTabsMenuButton = 0x8000,     //!< If the flag is set each dock area has a tabs menu button
+		DockAreaHideDisabledButtons = 0x10000,    //!< If the flag is set disabled dock area buttons will not appear on the tollbar at all (enabling them will bring them back)
+		DockAreaDynamicTabsMenuButtonVisibility = 0x20000,     //!< If the flag is set dock area will disable a tabs menu button when there is only one tab in the area
+		FloatingContainerHasWidgetTitle = 0x40000,
+		FloatingContainerHasWidgetIcon = 0x80000,
+
+
+        DefaultDockAreaButtons = DockAreaHasCloseButton
+							   | DockAreaHasUndockButton
+		                       | DockAreaHasTabsMenuButton,///< default configuration of dock area title bar buttons
+
+		DefaultBaseConfig = DefaultDockAreaButtons
+		                  | ActiveTabHasCloseButton
+		                  | XmlCompressionEnabled
+		                  | FloatingContainerHasWidgetTitle,///< default base configuration settings
+
+        DefaultOpaqueConfig = DefaultBaseConfig
+		                    | OpaqueSplitterResize
+		                    | OpaqueUndocking, ///< the default configuration with opaque operations - this may cause issues if ActiveX or Qt 3D windows are involved
+
+		DefaultNonOpaqueConfig = DefaultBaseConfig
 		              | DragPreviewShowsContentPixmap, ///< the default configuration for non opaque operations
-		NonOpaqueWithWindowFrame = ActiveTabHasCloseButton
-		              | DockAreaHasCloseButton
-		              | XmlCompressionEnabled
-		              | DragPreviewShowsContentPixmap
+
+		NonOpaqueWithWindowFrame = DefaultNonOpaqueConfig
 		              | DragPreviewHasWindowFrame ///< the default configuration for non opaque operations that show a real window with frame
 	};
 	Q_DECLARE_FLAGS(ConfigFlags, eConfigFlag)
@@ -203,6 +218,11 @@ public:
 	 */
 	static void setConfigFlag(eConfigFlag Flag, bool On = true);
 
+	/**
+	 * Returns true if the given config flag is set
+	 */
+	static bool testConfigFlag(eConfigFlag Flag);
+
 	/**
 	 * Returns the global icon provider.
 	 * The icon provider enables the use of custom icons in case using
@@ -281,7 +301,7 @@ public:
 	 * This function always return 0 because the main window is always behind
 	 * any floating widget
 	 */
-	virtual unsigned int zOrderIndex() const;
+	unsigned int zOrderIndex() const override;
 
 	/**
 	 * Saves the current state of the dockmanger and all its dock widgets
@@ -430,10 +450,17 @@ signals:
 
     /**
      * This signal is emitted if the dock manager finished opening a
-     * perspective
+     * perspective.
      */
     void perspectiveOpened(const QString& PerspectiveName);
 
+	/**
+	 * This signal is emitted, if a new floating widget has been created.
+	 * An application can use this signal to e.g. subscribe to events of
+	 * the newly created window.
+	 */
+	void floatingWidgetCreated(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

src/DockOverlay.cpp

@@ -380,13 +380,14 @@ DockWidgetArea CDockOverlay::dropAreaUnderCursor() const
 		return Result;
 	}
 
-	CDockAreaWidget* DockArea = dynamic_cast<CDockAreaWidget*>(d->TargetWidget.data());
+	CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(d->TargetWidget.data());
 	if (!DockArea)
 	{
 		return Result;
 	}
 
-	if (DockArea->titleBarGeometry().contains(DockArea->mapFromGlobal(QCursor::pos())))
+	if (DockArea->allowedAreas().testFlag(CenterDockWidgetArea)
+	 && DockArea->titleBarGeometry().contains(DockArea->mapFromGlobal(QCursor::pos())))
 	{
 		return CenterDockWidgetArea;
 	}
@@ -631,7 +632,7 @@ void CDockOverlayCross::updateOverlayIcons()
 	{
 		d->updateDropIndicatorIcon(Widget);
 	}
-#if QT_VESION >= 0x050600
+#if QT_VERSION >= 0x050600
 	d->LastDevicePixelRatio = devicePixelRatioF();
 #else
     d->LastDevicePixelRatio = devicePixelRatio();

src/DockWidget.cpp

@@ -31,6 +31,8 @@
 #include "DockWidgetTab.h"
 #include "DockWidget.h"
 
+#include <iostream>
+
 #include <QBoxLayout>
 #include <QAction>
 #include <QSplitter>
@@ -43,11 +45,16 @@
 #include <QToolBar>
 #include <QXmlStreamWriter>
 
+#include <QGuiApplication>
+#include <QScreen>
+#include <QWindow>
+
 #include "DockContainerWidget.h"
 #include "DockAreaWidget.h"
 #include "DockManager.h"
 #include "FloatingDockContainer.h"
 #include "DockSplitter.h"
+#include "DockComponentsFactory.h"
 #include "ads_globals.h"
 
 
@@ -62,7 +69,7 @@ struct DockWidgetPrivate
 	QBoxLayout* Layout = nullptr;
 	QWidget* Widget = nullptr;
 	CDockWidgetTab* TabWidget = nullptr;
-	CDockWidget::DockWidgetFeatures Features = CDockWidget::AllDockWidgetFeatures;
+	CDockWidget::DockWidgetFeatures Features = CDockWidget::DefaultDockWidgetFeatures;
 	CDockManager* DockManager = nullptr;
 	CDockAreaWidget* DockArea = nullptr;
 	QAction* ToggleViewAction = nullptr;
@@ -74,6 +81,7 @@ struct DockWidgetPrivate
 	QSize ToolBarIconSizeDocked = QSize(16, 16);
 	QSize ToolBarIconSizeFloating = QSize(24, 24);
 	bool IsFloatingTopLevel = false;
+	QList<QAction*> TitleBarActions;
 
 	/**
 	 * Private data constructor
@@ -128,8 +136,8 @@ void DockWidgetPrivate::showDockWidget()
 	}
 	else
 	{
-		DockArea->toggleView(true);
 		DockArea->setCurrentDockWidget(_this);
+		DockArea->toggleView(true);
 		TabWidget->show();
 		QSplitter* Splitter = internal::findParent<QSplitter*>(DockArea);
 		while (Splitter && !Splitter->isVisible())
@@ -213,7 +221,7 @@ CDockWidget::CDockWidget(const QString &title, QWidget *parent) :
 	setWindowTitle(title);
 	setObjectName(title);
 
-	d->TabWidget = new CDockWidgetTab(this);
+	d->TabWidget = componentsFactory()->createDockWidgetTab(this);
     d->ToggleViewAction = new QAction(title, this);
 	d->ToggleViewAction->setCheckable(true);
 	connect(d->ToggleViewAction, SIGNAL(triggered(bool)), this,
@@ -294,6 +302,7 @@ void CDockWidget::setFeatures(DockWidgetFeatures features)
 		return;
 	}
 	d->Features = features;
+	emit featuresChanged(d->Features);
 	d->TabWidget->onDockWidgetFeaturesChanged();
 }
 
@@ -515,23 +524,39 @@ void CDockWidget::flagAsUnassigned()
 //============================================================================
 bool CDockWidget::event(QEvent *e)
 {
-	if (e->type() == QEvent::WindowTitleChange)
+	switch (e->type())
 	{
-		const auto title = windowTitle();
-		if (d->TabWidget)
+	case QEvent::Hide:
+		emit visibilityChanged(false);
+		break;
+
+	case QEvent::Show:
+		emit visibilityChanged(geometry().right() >= 0 && geometry().bottom() >= 0);
+        break;
+
+	case QEvent::WindowTitleChange :
 		{
-			d->TabWidget->setText(title);
+			const auto title = windowTitle();
+			if (d->TabWidget)
+			{
+				d->TabWidget->setText(title);
+			}
+			if (d->ToggleViewAction)
+			{
+				d->ToggleViewAction->setText(title);
+			}
+			if (d->DockArea)
+			{
+				d->DockArea->markTitleBarMenuOutdated();//update tabs menu
+			}
+			emit titleChanged(title);
 		}
-		if (d->ToggleViewAction)
-		{
-			d->ToggleViewAction->setText(title);
-		}
-		if (d->DockArea)
-		{
-			d->DockArea->markTitleBarMenuOutdated();//update tabs menu
-		}
-		emit titleChanged(title);
+		break;
+
+	default:
+		break;
 	}
+
 	return Super::event(e);
 }
 
@@ -742,6 +767,69 @@ void CDockWidget::deleteDockWidget()
 {
 	dockManager()->removeDockWidget(this);
 	deleteLater();
+	d->Closed = true;
+}
+
+
+//============================================================================
+void CDockWidget::closeDockWidget()
+{
+	closeDockWidgetInternal(true);
+}
+
+
+//============================================================================
+bool CDockWidget::closeDockWidgetInternal(bool ForceClose)
+{
+	if (!ForceClose)
+	{
+		emit closeRequested();
+	}
+
+	if (!ForceClose && features().testFlag(CDockWidget::CustomCloseHandling))
+	{
+		return false;
+	}
+
+	if (features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
+    {
+		// If the dock widget is floating, then we check if we also need to
+		// delete the floating widget
+		if (isFloating())
+		{
+			CFloatingDockContainer* FloatingWidget = internal::findParent<
+					CFloatingDockContainer*>(this);
+			if (FloatingWidget->dockWidgets().count() == 1)
+			{
+				FloatingWidget->deleteLater();
+			}
+			else
+			{
+				FloatingWidget->hide();
+			}
+		}
+		deleteDockWidget();
+    }
+    else
+    {
+    	toggleView(false);
+    }
+
+	return true;
+}
+
+
+//============================================================================
+void CDockWidget::setTitleBarActions(QList<QAction*> actions)
+{
+	d->TitleBarActions = actions;
+}
+
+
+//============================================================================
+QList<QAction*> CDockWidget::titleBarActions() const
+{
+	return d->TitleBarActions;
 }
 
 

src/DockWidget.h

@@ -53,402 +53,451 @@ class CFloatingDockContainer;
  */
 class ADS_EXPORT CDockWidget : public QFrame
 {
-	Q_OBJECT
+    Q_OBJECT
 private:
-	DockWidgetPrivate* d; ///< private data (pimpl)
-	friend struct DockWidgetPrivate;
+    DockWidgetPrivate* d; ///< private data (pimpl)
+    friend struct DockWidgetPrivate;
 
 private slots:
-	/**
-	 * Adjusts the toolbar icon sizes according to the floating state
-	 */
-	void setToolbarFloatingStyle(bool topLevel);
+    /**
+     * Adjusts the toolbar icon sizes according to the floating state
+     */
+    void setToolbarFloatingStyle(bool topLevel);
 
 protected:
-	friend class CDockContainerWidget;
-	friend class CDockAreaWidget;
-	friend class CFloatingDockContainer;
-	friend class CDockManager;
-	friend struct DockManagerPrivate;
-	friend class DockContainerWidgetPrivate;
-	friend class CDockAreaTabBar;
-	friend class CDockWidgetTab;
-	friend struct DockWidgetTabPrivate;
+    friend class CDockContainerWidget;
+    friend class CDockAreaWidget;
+    friend class CFloatingDockContainer;
+    friend class CDockManager;
+    friend struct DockManagerPrivate;
+    friend class DockContainerWidgetPrivate;
+    friend class CDockAreaTabBar;
+    friend class CDockWidgetTab;
+    friend struct DockWidgetTabPrivate;
+    friend struct DockAreaTitleBarPrivate;
 
-	/**
-	 * Assigns the dock manager that manages this dock widget
-	 */
-	void setDockManager(CDockManager* DockManager);
+    /**
+     * Assigns the dock manager that manages this dock widget
+     */
+    void setDockManager(CDockManager* DockManager);
 
-	/**
-	 * If this dock widget is inserted into a dock area, the dock area will
-	 * be registered on this widget via this function. If a dock widget is
-	 * removed from a dock area, this function will be called with nullptr
-	 * value.
-	 */
-	void setDockArea(CDockAreaWidget* DockArea);
+    /**
+     * If this dock widget is inserted into a dock area, the dock area will
+     * be registered on this widget via this function. If a dock widget is
+     * removed from a dock area, this function will be called with nullptr
+     * value.
+     */
+    void setDockArea(CDockAreaWidget* DockArea);
 
-	/**
-	 * This function changes the toggle view action without emitting any
-	 * signal
-	 */
-	void setToggleViewActionChecked(bool Checked);
+    /**
+     * This function changes the toggle view action without emitting any
+     * signal
+     */
+    void setToggleViewActionChecked(bool Checked);
 
-	/**
-	 * Saves the state into the given stream
-	 */
-	void saveState(QXmlStreamWriter& Stream) const;
+    /**
+     * Saves the state into the given stream
+     */
+    void saveState(QXmlStreamWriter& Stream) const;
 
-	/**
-	 * This is a helper function for the dock manager to flag this widget
-	 * as unassigned.
-	 * When calling the restore function, it may happen, that the saved state
-	 * contains less dock widgets then currently available. All widgets whose
-	 * data is not contained in the saved state, are flagged as unassigned
-	 * after the restore process. If the user shows an unassigned dock widget,
-	 * a floating widget will be created to take up the dock widget.
-	 */
-	void flagAsUnassigned();
+    /**
+     * This is a helper function for the dock manager to flag this widget
+     * as unassigned.
+     * When calling the restore function, it may happen, that the saved state
+     * contains less dock widgets then currently available. All widgets whose
+     * data is not contained in the saved state, are flagged as unassigned
+     * after the restore process. If the user shows an unassigned dock widget,
+     * a floating widget will be created to take up the dock widget.
+     */
+    void flagAsUnassigned();
 
-	/**
-	 * Call this function to emit a topLevelChanged() signal and to update
-	 * the dock area tool bar visibility
-	 */
-	static void emitTopLevelEventForWidget(CDockWidget* TopLevelDockWidget, bool Floating);
+    /**
+     * Call this function to emit a topLevelChanged() signal and to update
+     * the dock area tool bar visibility
+     */
+    static void emitTopLevelEventForWidget(CDockWidget* TopLevelDockWidget, bool Floating);
 
-	/**
-	 * Use this function to emit a top level changed event.
-	 * Do never use emit topLevelChanged(). Always use this function because
-	 * it only emits a signal if the floating state has really changed
-	 */
-	void emitTopLevelChanged(bool Floating);
+    /**
+     * Use this function to emit a top level changed event.
+     * Do never use emit topLevelChanged(). Always use this function because
+     * it only emits a signal if the floating state has really changed
+     */
+    void emitTopLevelChanged(bool Floating);
 
-	/**
-	 * Internal function for modifying the closed state when restoring
-	 * a saved docking state
-	 */
-	void setClosedState(bool Closed);
+    /**
+     * Internal function for modifying the closed state when restoring
+     * a saved docking state
+     */
+    void setClosedState(bool Closed);
 
-	/**
-	 * Internal toggle view function that does not check if the widget
-	 * already is in the given state
-	 */
-	void toggleViewInternal(bool Open);
+    /**
+     * Internal toggle view function that does not check if the widget
+     * already is in the given state
+     */
+    void toggleViewInternal(bool Open);
+
+    /**
+     * Internal close dock widget implementation.
+     * The function returns true if the dock widget has been closed or hidden
+     */
+    bool closeDockWidgetInternal(bool ForceClose = false);
 
 public:
-	using Super = QFrame;
+    using Super = QFrame;
 
-	enum DockWidgetFeature
-	{
-		DockWidgetClosable = 0x01,
-		DockWidgetMovable = 0x02,///< this feature is not properly implemented yet and is ignored
-		DockWidgetFloatable = 0x04,
-		DockWidgetDeleteOnClose = 0x08, ///< deletes the dock widget when it is closed
-		AllDockWidgetFeatures = DockWidgetClosable | DockWidgetMovable | DockWidgetFloatable,
-		NoDockWidgetFeatures = 0x00
-	};
-	Q_DECLARE_FLAGS(DockWidgetFeatures, DockWidgetFeature)
+    enum DockWidgetFeature
+    {
+        DockWidgetClosable = 0x01,
+        DockWidgetMovable = 0x02,///< this feature is not properly implemented yet and is ignored
+        DockWidgetFloatable = 0x04,
+        DockWidgetDeleteOnClose = 0x08, ///< deletes the dock widget when it is closed
+        CustomCloseHandling = 0x10,
+        DefaultDockWidgetFeatures = DockWidgetClosable | DockWidgetMovable | DockWidgetFloatable,
+        AllDockWidgetFeatures = DefaultDockWidgetFeatures | DockWidgetDeleteOnClose | CustomCloseHandling,
+        NoDockWidgetFeatures = 0x00
+    };
+    Q_DECLARE_FLAGS(DockWidgetFeatures, DockWidgetFeature)
 
-	enum eState
-	{
-		StateHidden,
-		StateDocked,
-		StateFloating
-	};
+    enum eState
+    {
+        StateHidden,
+        StateDocked,
+        StateFloating
+    };
 
-	/**
-	 * Sets the widget for the dock widget to widget.
-	 * The InsertMode defines how the widget is inserted into the dock widget.
-	 * The content of a dock widget should be resizable do a very small size to
-	 * prevent the dock widget from blocking the resizing. To ensure, that a
-	 * dock widget can be resized very well, it is better to insert the content+
-	 * widget into a scroll area or to provide a widget that is already a scroll
-	 * area or that contains a scroll area.
-	 * If the InsertMode is AutoScrollArea, the DockWidget tries to automatically
-	 * detect how to insert the given widget. If the widget is derived from
-	 * QScrollArea (i.e. an QAbstractItemView), then the widget is inserted
-	 * directly. If the given widget is not a scroll area, the widget will be
-	 * inserted into a scroll area.
-	 * To force insertion into a scroll area, you can also provide the InsertMode
-	 * ForceScrollArea. To prevent insertion into a scroll area, you can
-	 * provide the InsertMode ForceNoScrollArea
-	 */
-	enum eInsertMode
-	{
-		AutoScrollArea,
-		ForceScrollArea,
-		ForceNoScrollArea
-	};
+    /**
+     * Sets the widget for the dock widget to widget.
+     * The InsertMode defines how the widget is inserted into the dock widget.
+     * The content of a dock widget should be resizable do a very small size to
+     * prevent the dock widget from blocking the resizing. To ensure, that a
+     * dock widget can be resized very well, it is better to insert the content+
+     * widget into a scroll area or to provide a widget that is already a scroll
+     * area or that contains a scroll area.
+     * If the InsertMode is AutoScrollArea, the DockWidget tries to automatically
+     * detect how to insert the given widget. If the widget is derived from
+     * QScrollArea (i.e. an QAbstractItemView), then the widget is inserted
+     * directly. If the given widget is not a scroll area, the widget will be
+     * inserted into a scroll area.
+     * To force insertion into a scroll area, you can also provide the InsertMode
+     * ForceScrollArea. To prevent insertion into a scroll area, you can
+     * provide the InsertMode ForceNoScrollArea
+     */
+    enum eInsertMode
+    {
+        AutoScrollArea,
+        ForceScrollArea,
+        ForceNoScrollArea
+    };
 
-	/**
-	 * This mode configures the behavior of the toggle view action.
-	 * If the mode if ActionModeToggle, then the toggle view action is
-	 * a checkable action to show / hide the dock widget. If the mode
-	 * is ActionModeShow, then the action is not checkable an it will
-	 * always show the dock widget if clicked. If the mode is ActionModeShow,
-	 * the user can only close the DockWidget with the close button.
-	 */
-	enum eToggleViewActionMode
-	{
-		ActionModeToggle,//!< ActionModeToggle
-		ActionModeShow   //!< ActionModeShow
-	};
+    /**
+     * This mode configures the behavior of the toggle view action.
+     * If the mode if ActionModeToggle, then the toggle view action is
+     * a checkable action to show / hide the dock widget. If the mode
+     * is ActionModeShow, then the action is not checkable an it will
+     * always show the dock widget if clicked. If the mode is ActionModeShow,
+     * the user can only close the DockWidget with the close button.
+     */
+    enum eToggleViewActionMode
+    {
+        ActionModeToggle,//!< ActionModeToggle
+        ActionModeShow   //!< ActionModeShow
+    };
 
 
-	/**
-	 * This constructor creates a dock widget with the given title.
-	 * The title is the text that is shown in the window title when the dock
-	 * widget is floating and it is the title that is shown in the titlebar
-	 * or the tab of this dock widget if it is tabified.
-	 * The object name of the dock widget is also set to the title. The
-	 * object name is required by the dock manager to properly save and restore
-	 * the state of the dock widget. That means, the title needs to be unique.
-	 * If your title is not unique or if you would like to change the title
-	 * during runtime, you need to set a unique object name explicitely
-	 * by calling setObjectName() after construction.
-	 * Use the layoutFlags to configure the layout of the dock widget.
-	 */
-	CDockWidget(const QString &title, QWidget* parent = 0);
+    /**
+     * This constructor creates a dock widget with the given title.
+     * The title is the text that is shown in the window title when the dock
+     * widget is floating and it is the title that is shown in the titlebar
+     * or the tab of this dock widget if it is tabified.
+     * The object name of the dock widget is also set to the title. The
+     * object name is required by the dock manager to properly save and restore
+     * the state of the dock widget. That means, the title needs to be unique.
+     * If your title is not unique or if you would like to change the title
+     * during runtime, you need to set a unique object name explicitely
+     * by calling setObjectName() after construction.
+     * Use the layoutFlags to configure the layout of the dock widget.
+     */
+    CDockWidget(const QString &title, QWidget* parent = 0);
 
-	/**
-	 * Virtual Destructor
-	 */
-	virtual ~CDockWidget();
+    /**
+     * Virtual Destructor
+     */
+    virtual ~CDockWidget();
 
-	/**
-	 * We return a fixed minimum size hint for all dock widgets
-	 */
-	virtual QSize minimumSizeHint() const override;
+    /**
+     * We return a fixed minimum size hint for all dock widgets
+     */
+    virtual QSize minimumSizeHint() const override;
 
-	/**
-	 * Sets the widget for the dock widget to widget.
-	 * The InsertMode defines how the widget is inserted into the dock widget.
-	 * The content of a dock widget should be resizable do a very small size to
-	 * prevent the dock widget from blocking the resizing. To ensure, that a
-	 * dock widget can be resized very well, it is better to insert the content+
-	 * widget into a scroll area or to provide a widget that is already a scroll
-	 * area or that contains a scroll area.
-	 * If the InsertMode is AutoScrollArea, the DockWidget tries to automatically
-	 * detect how to insert the given widget. If the widget is derived from
-	 * QScrollArea (i.e. an QAbstractItemView), then the widget is inserted
-	 * directly. If the given widget is not a scroll area, the widget will be
-	 * inserted into a scroll area.
-	 * To force insertion into a scroll area, you can also provide the InsertMode
-	 * ForceScrollArea. To prevent insertion into a scroll area, you can
-	 * provide the InsertMode ForceNoScrollArea
-	 */
-	void setWidget(QWidget* widget, eInsertMode InsertMode = AutoScrollArea);
+    /**
+     * Sets the widget for the dock widget to widget.
+     * The InsertMode defines how the widget is inserted into the dock widget.
+     * The content of a dock widget should be resizable do a very small size to
+     * prevent the dock widget from blocking the resizing. To ensure, that a
+     * dock widget can be resized very well, it is better to insert the content+
+     * widget into a scroll area or to provide a widget that is already a scroll
+     * area or that contains a scroll area.
+     * If the InsertMode is AutoScrollArea, the DockWidget tries to automatically
+     * detect how to insert the given widget. If the widget is derived from
+     * QScrollArea (i.e. an QAbstractItemView), then the widget is inserted
+     * directly. If the given widget is not a scroll area, the widget will be
+     * inserted into a scroll area.
+     * To force insertion into a scroll area, you can also provide the InsertMode
+     * ForceScrollArea. To prevent insertion into a scroll area, you can
+     * provide the InsertMode ForceNoScrollArea
+     */
+    void setWidget(QWidget* widget, eInsertMode InsertMode = AutoScrollArea);
 
-	/**
-	 * Remove the widget from the dock and give ownership back to the caller
-	 */
-	QWidget* takeWidget();
+    /**
+     * Remove the widget from the dock and give ownership back to the caller
+     */
+    QWidget* takeWidget();
 
-	/**
-	 * Returns the widget for the dock widget. This function returns zero if
-	 * the widget has not been set.
-	 */
-	QWidget* widget() const;
+    /**
+     * Returns the widget for the dock widget. This function returns zero if
+     * the widget has not been set.
+     */
+    QWidget* widget() const;
 
-	/**
-	 * Returns the tab widget of this dock widget that is shown in the dock
-	 * area title bar
-	 */
-	CDockWidgetTab* tabWidget() const;
+    /**
+     * Returns the tab widget of this dock widget that is shown in the dock
+     * area title bar
+     */
+    CDockWidgetTab* tabWidget() const;
 
-	/**
-	 * Sets, whether the dock widget is movable, closable, and floatable.
-	 */
-	void setFeatures(DockWidgetFeatures features);
+    /**
+     * Sets, whether the dock widget is movable, closable, and floatable.
+     */
+    void setFeatures(DockWidgetFeatures features);
 
-	/**
-	 * Sets the feature flag for this dock widget if on is true; otherwise
-	 * clears the flag.
-	 */
-	void setFeature(DockWidgetFeature flag, bool on);
+    /**
+     * Sets the feature flag for this dock widget if on is true; otherwise
+     * clears the flag.
+     */
+    void setFeature(DockWidgetFeature flag, bool on);
 
-	/**
-	 * This property holds whether the dock widget is movable, closable, and
-	 * floatable.
-	 * By default, this property is set to a combination of DockWidgetClosable,
-	 * DockWidgetMovable and DockWidgetFloatable.
-	 */
-	DockWidgetFeatures features() const;
+    /**
+     * This property holds whether the dock widget is movable, closable, and
+     * floatable.
+     * By default, this property is set to a combination of DockWidgetClosable,
+     * DockWidgetMovable and DockWidgetFloatable.
+     */
+    DockWidgetFeatures features() const;
 
-	/**
-	 * Returns the dock manager that manages the dock widget or 0 if the widget
-	 * has not been assigned to any dock manager yet
-	 */
-	CDockManager* dockManager() const;
+    /**
+     * Returns the dock manager that manages the dock widget or 0 if the widget
+     * has not been assigned to any dock manager yet
+     */
+    CDockManager* dockManager() const;
 
-	/**
-	 * Returns the dock container widget this dock area widget belongs to or 0
-	 * if this dock widget has not been docked yet
-	 */
-	CDockContainerWidget* dockContainer() const;
+    /**
+     * Returns the dock container widget this dock area widget belongs to or 0
+     * if this dock widget has not been docked yet
+     */
+    CDockContainerWidget* dockContainer() const;
 
-	/**
-	 * Returns the dock area widget this dock widget belongs to or 0
-	 * if this dock widget has not been docked yet
-	 */
-	CDockAreaWidget* dockAreaWidget() const;
+    /**
+     * Returns the dock area widget this dock widget belongs to or 0
+     * if this dock widget has not been docked yet
+     */
+    CDockAreaWidget* dockAreaWidget() const;
 
-	/**
-	 * This property holds whether the dock widget is floating.
-	 * A dock widget is only floating, if it is the one and only widget inside
-	 * of a floating container. If there are more than one dock widget in a
-	 * floating container, the all dock widgets are docked and not floating.
-	 */
-	bool isFloating() const;
+    /**
+     * This property holds whether the dock widget is floating.
+     * A dock widget is only floating, if it is the one and only widget inside
+     * of a floating container. If there are more than one dock widget in a
+     * floating container, the all dock widgets are docked and not floating.
+     */
+    bool isFloating() const;
 
-	/**
-	 * This function returns true, if this dock widget is in a floating.
-	 * The function returns true, if the dock widget is floating and it also
-	 * returns true if it is docked inside of a floating container.
-	 */
-	bool isInFloatingContainer() const;
+    /**
+     * This function returns true, if this dock widget is in a floating.
+     * The function returns true, if the dock widget is floating and it also
+     * returns true if it is docked inside of a floating container.
+     */
+    bool isInFloatingContainer() const;
 
-	/**
-	 * Returns true, if this dock widget is closed.
-	 */
-	bool isClosed() const;
+    /**
+     * Returns true, if this dock widget is closed.
+     */
+    bool isClosed() const;
 
-	/**
-	 * Returns a checkable action that can be used to show or close this dock widget.
-	 * The action's text is set to the dock widget's window title.
-	 */
-	QAction* toggleViewAction() const;
+    /**
+     * Returns a checkable action that can be used to show or close this dock widget.
+     * The action's text is set to the dock widget's window title.
+     */
+    QAction* toggleViewAction() const;
 
-	/**
-	 * Configures the behavior of the toggle view action.
-	 * \see eToggleViewActionMode for a detailed description
-	 */
-	void setToggleViewActionMode(eToggleViewActionMode Mode);
+    /**
+     * Configures the behavior of the toggle view action.
+     * \see eToggleViewActionMode for a detailed description
+     */
+    void setToggleViewActionMode(eToggleViewActionMode Mode);
 
-	/**
-	 * Sets the dock widget icon that is shown in tabs and in toggle view
-	 * actions
-	 */
-	void setIcon(const QIcon& Icon);
+    /**
+     * Sets the dock widget icon that is shown in tabs and in toggle view
+     * actions
+     */
+    void setIcon(const QIcon& Icon);
 
-	/**
-	 * Returns the icon that has been assigned to the dock widget
-	 */
-	QIcon icon() const;
+    /**
+     * Returns the icon that has been assigned to the dock widget
+     */
+    QIcon icon() const;
 
-	/**
-	 * If the WithToolBar layout flag is enabled, then this function returns
-	 * the dock widget toolbar. If the flag is disabled, the function returns
-	 * a nullptr.
-	 * This function returns the dock widget top tool bar.
-	 * If no toolbar is assigned, this function returns nullptr. To get a vaild
-	 * toolbar you either need to create a default empty toolbar via
-	 * createDefaultToolBar() function or you need to assign you custom
-	 * toolbar via setToolBar().
-	 */
-	QToolBar* toolBar() const;
+    /**
+     * If the WithToolBar layout flag is enabled, then this function returns
+     * the dock widget toolbar. If the flag is disabled, the function returns
+     * a nullptr.
+     * This function returns the dock widget top tool bar.
+     * If no toolbar is assigned, this function returns nullptr. To get a vaild
+     * toolbar you either need to create a default empty toolbar via
+     * createDefaultToolBar() function or you need to assign you custom
+     * toolbar via setToolBar().
+     */
+    QToolBar* toolBar() const;
 
-	/**
-	 * If you would like to use the default top tool bar, then call this
-	 * function to create the default tool bar.
-	 * After this function the toolBar() function will return a valid toolBar()
-	 * object.
-	 */
-	QToolBar* createDefaultToolBar();
+    /**
+     * If you would like to use the default top tool bar, then call this
+     * function to create the default tool bar.
+     * After this function the toolBar() function will return a valid toolBar()
+     * object.
+     */
+    QToolBar* createDefaultToolBar();
 
-	/**
-	 * Assign a new tool bar that is shown above the content widget.
-	 * The dock widget will become the owner of the tool bar and deletes it
-	 * on destruction
-	 */
-	void setToolBar(QToolBar* ToolBar);
+    /**
+     * Assign a new tool bar that is shown above the content widget.
+     * The dock widget will become the owner of the tool bar and deletes it
+     * on destruction
+     */
+    void setToolBar(QToolBar* ToolBar);
 
-	/**
-	 * This function sets the tool button style for the given dock widget state.
-	 * It is possible to switch the tool button style depending on the state.
-	 * If a dock widget is floating, then here are more space and it is
-	 * possible to select a style that requires more space like
-	 * Qt::ToolButtonTextUnderIcon. For the docked state Qt::ToolButtonIconOnly
-	 * might be better.
-	 */
-	void setToolBarStyle(Qt::ToolButtonStyle Style, eState State);
+    /**
+     * This function sets the tool button style for the given dock widget state.
+     * It is possible to switch the tool button style depending on the state.
+     * If a dock widget is floating, then here are more space and it is
+     * possible to select a style that requires more space like
+     * Qt::ToolButtonTextUnderIcon. For the docked state Qt::ToolButtonIconOnly
+     * might be better.
+     */
+    void setToolBarStyle(Qt::ToolButtonStyle Style, eState State);
 
-	/**
-	 * Returns the tool button style for the given docking state.
-	 * \see setToolBarStyle()
-	 */
-	Qt::ToolButtonStyle toolBarStyle(eState State) const;
+    /**
+     * Returns the tool button style for the given docking state.
+     * \see setToolBarStyle()
+     */
+    Qt::ToolButtonStyle toolBarStyle(eState State) const;
 
-	/**
-	 * This function sets the tool button icon size for the given state.
-	 * If a dock widget is floating, there is more space an increasing the
-	 * icon size is possible. For docked widgets, small icon sizes, eg. 16 x 16
-	 * might be better.
-	 */
-	void setToolBarIconSize(const QSize& IconSize, eState State);
+    /**
+     * This function sets the tool button icon size for the given state.
+     * If a dock widget is floating, there is more space an increasing the
+     * icon size is possible. For docked widgets, small icon sizes, eg. 16 x 16
+     * might be better.
+     */
+    void setToolBarIconSize(const QSize& IconSize, eState State);
 
-	/**
-	 * Returns the icon size for a given docking state.
-	 * \see setToolBarIconSize()
-	 */
-	QSize toolBarIconSize(eState State) const;
+    /**
+     * Returns the icon size for a given docking state.
+     * \see setToolBarIconSize()
+     */
+    QSize toolBarIconSize(eState State) const;
+
+    /**
+     * Set the actions that will be shown in the dock area title bar
+     * if this dock widget is the active tab.
+     * You should not add to many actions to the title bar, because this
+     * will remove the available space for the tabs. If you have a number
+     * of actions, just add an action with a menu to show a popup menu
+     * button in the title bar.
+     */
+    void setTitleBarActions(QList<QAction*> actions);
+
+    /**
+     * Returns a list of actions that will be inserted into the dock area title
+     * bar if this dock widget becomes the current widget
+     */
+    virtual QList<QAction*> titleBarActions() const;
 
 
 #ifndef QT_NO_TOOLTIP
-	/**
-	 * This is function sets text tooltip for title bar widget 
-	 * and tooltip for toggle view action
-	 */
-	void setTabToolTip(const QString &text);
+    /**
+     * This is function sets text tooltip for title bar widget
+     * and tooltip for toggle view action
+     */
+    void setTabToolTip(const QString &text);
 #endif
 
 public: // reimplements QFrame -----------------------------------------------
-	/**
-	 * Emits titleChanged signal if title change event occurs
-	 */
-	virtual bool event(QEvent *e) override;
+    /**
+     * Emits titleChanged signal if title change event occurs
+     */
+    virtual bool event(QEvent *e) override;
 
 public slots:
-	/**
-	 * This property controls whether the dock widget is open or closed.
-	 * The toogleViewAction triggers this slot
-	 */
-	void toggleView(bool Open = true);
+    /**
+     * This property controls whether the dock widget is open or closed.
+     * The toogleViewAction triggers this slot
+     */
+    void toggleView(bool Open = true);
 
-	/**
-	 * This function will make a docked widget floating
-	 */
-	void setFloating();
+    /**
+     * This function will make a docked widget floating
+     */
+    void setFloating();
+
+    /**
+     * This function will delete the dock widget and its content from the
+     * docking system
+     */
+    void deleteDockWidget();
+
+    /**
+     * Closes the dock widget
+     */
+    void closeDockWidget();
 
-	/**
-	 * This function will delete the dock widget and its content from the
-	 * docking system
-	 */
-	void deleteDockWidget();
 
 signals:
-	/**
-	 * This signal is emitted if the dock widget is opened or closed
-	 */
-	void viewToggled(bool Open);
+    /**
+     * This signal is emitted if the dock widget is opened or closed
+     */
+    void viewToggled(bool Open);
 
-	/**
-	 * This signal is emitted if the dock widget is closed
-	 */
-	void closed();
+    /**
+     * This signal is emitted if the dock widget is closed
+     */
+    void closed();
 
-	/**
-	 * This signal is emitted if the window title of this dock widget
-	 * changed
-	 */
-	void titleChanged(const QString& Title);
+    /**
+     * This signal is emitted if the window title of this dock widget
+     * changed
+     */
+    void titleChanged(const QString& Title);
 
-	/**
-	 * This signal is emitted when the floating property changes.
-	 * The topLevel parameter is true if the dock widget is now floating;
-	 * otherwise it is false.
-	 */
-	void topLevelChanged(bool topLevel);
+    /**
+     * This signal is emitted when the floating property changes.
+     * The topLevel parameter is true if the dock widget is now floating;
+     * otherwise it is false.
+     */
+    void topLevelChanged(bool topLevel);
+
+    /**
+     * This signal is emitted, if close is requested
+     */
+    void closeRequested();
+
+    /**
+     * This signal is emitted when the dock widget becomes visible (or invisible).
+     * This happens when the widget is hidden or shown, as well as when it is
+     * docked in a tabbed dock area and its tab becomes selected or unselected.
+     */
+    void visibilityChanged(bool visible);
+
+    /**
+     * This signal is emitted when the features property changes.
+     * The features parameter gives the new value of the property.
+     */
+    void featuresChanged(DockWidgetFeatures features);
 }; // class DockWidget
 }
  // namespace ads

src/DockWidgetTab.cpp

@@ -67,7 +67,7 @@ struct DockWidgetTabPrivate
 	CDockWidget* DockWidget;
 	QLabel* IconLabel = nullptr;
 	tTabLabel* TitleLabel;
-	QPoint DragStartMousePosition;
+	QPoint GlobalDragStartMousePosition;
 	bool IsActiveTab = false;
 	CDockAreaWidget* DockArea = nullptr;
 	eDragState DragState = DraggingInactive;
@@ -100,15 +100,6 @@ struct DockWidgetTabPrivate
 		return this->DragState == dragState;
 	}
 
-	/**
-	 * Returns true if the given global point is inside the title area geometry
-	 * rectangle.
-	 * The position is given as global position.
-	 */
-	bool titleAreaGeometryContains(const QPoint& GlobalPos) const
-	{
-		return DockArea->titleBarGeometry().contains(DockArea->mapFromGlobal(GlobalPos));
-	}
 
 	/**
 	 * Starts floating of the dock widget that belongs to this title bar
@@ -179,23 +170,15 @@ void DockWidgetTabPrivate::createLayout()
 	TitleLabel->setText(DockWidget->windowTitle());
 	TitleLabel->setObjectName("dockWidgetTabLabel");
 	TitleLabel->setAlignment(Qt::AlignCenter);
+	_this->connect(TitleLabel, SIGNAL(elidedChanged(bool)), SIGNAL(elidedChanged(bool)));
+
 
 	CloseButton = createCloseButton();
 	CloseButton->setObjectName("tabCloseButton");
-	QIcon CloseIcon = CDockManager::iconProvider().customIcon(TabCloseIcon);
-	if (CloseIcon.isNull())
-	{
-		// The standard icons do does not look good on high DPI screens
-		QPixmap normalPixmap = _this->style()->standardPixmap(QStyle::SP_TitleBarCloseButton, 0, CloseButton);
-		CloseIcon.addPixmap(normalPixmap, QIcon::Normal);
-		CloseIcon.addPixmap(internal::createTransparentPixmap(normalPixmap, 0.25), QIcon::Disabled);
-	}
-	CloseButton->setIcon(CloseIcon);
+	internal::setButtonIcon(CloseButton, QStyle::SP_TitleBarCloseButton, TabCloseIcon);
     CloseButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
     _this->onDockWidgetFeaturesChanged();
-#ifndef QT_NO_TOOLTIP
-	CloseButton->setToolTip(QObject::tr("Close Tab"));
-#endif
+	internal::setToolTip(CloseButton, QObject::tr("Close Tab"));
 	_this->connect(CloseButton, SIGNAL(clicked()), SIGNAL(closeRequested()));
 
 	QFontMetrics fm(TitleLabel->font());
@@ -219,11 +202,10 @@ void DockWidgetTabPrivate::createLayout()
 void DockWidgetTabPrivate::moveTab(QMouseEvent* ev)
 {
     ev->accept();
-    int left, top, right, bottom;
-    _this->getContentsMargins(&left, &top, &right, &bottom);
-    QPoint moveToPos = _this->mapToParent(ev->pos()) - DragStartMousePosition;
-    moveToPos.setY(0);
-    _this->move(moveToPos);
+    QPoint Distance = ev->globalPos() - GlobalDragStartMousePosition;
+    Distance.setY(0);
+    auto TargetPos = Distance + TabDragStartPosition;
+    _this->move(TargetPos);
     _this->raise();
 }
 
@@ -247,6 +229,7 @@ bool DockWidgetTabPrivate::startFloating(eDragState DraggingState)
 
     ADS_PRINT("startFloating");
 	DragState = DraggingState;
+	auto DragStartMousePosition = _this->mapFromGlobal(GlobalDragStartMousePosition);
 	QSize Size = DockArea->size();
 	IFloatingWidget* FloatingWidget = nullptr;
 	bool OpaqueUndocking = CDockManager::configFlags().testFlag(CDockManager::OpaqueUndocking) ||
@@ -304,7 +287,7 @@ void CDockWidgetTab::mousePressEvent(QMouseEvent* ev)
 	if (ev->button() == Qt::LeftButton)
 	{
 		ev->accept();
-        d->DragStartMousePosition = ev->pos();
+        d->GlobalDragStartMousePosition = ev->globalPos();
         d->DragState = DraggingMousePressed;
         emit clicked();
 		return;
@@ -320,7 +303,7 @@ void CDockWidgetTab::mouseReleaseEvent(QMouseEvent* ev)
 	if (ev->button() == Qt::LeftButton)
 	{
 		auto CurrentDragState = d->DragState;
-		d->DragStartMousePosition = QPoint();
+		d->GlobalDragStartMousePosition = QPoint();
 		d->DragState = DraggingInactive;
 
 		switch (CurrentDragState)
@@ -372,7 +355,7 @@ void CDockWidgetTab::mouseMoveEvent(QMouseEvent* ev)
     }
 
     // Maybe a fixed drag distance is better here ?
-    int DragDistanceY = qAbs(d->DragStartMousePosition.y() - ev->pos().y());
+    int DragDistanceY = qAbs(d->GlobalDragStartMousePosition.y() - ev->globalPos().y());
     if (DragDistanceY >= CDockManager::startDragDistance())
 	{
 		// If this is the last dock area in a dock container with only
@@ -385,8 +368,13 @@ void CDockWidgetTab::mouseMoveEvent(QMouseEvent* ev)
 			return;
 		}
 
-    	// Floating is only allowed for widgets that are movable
-        if (d->DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable))
+
+    	// Floating is only allowed for widgets that are floatable
+		// If we do non opaque undocking, then can create the drag preview
+		// if the widget is movable.
+		auto Features = d->DockWidget->features();
+        if (Features.testFlag(CDockWidget::DockWidgetFloatable)
+        || (Features.testFlag(CDockWidget::DockWidgetMovable) && !CDockManager::testConfigFlag(CDockManager::OpaqueUndocking)))
         {
         	// If we undock, we need to restore the initial position of this
         	// tab because it looks strange if it remains on its dragged position
@@ -399,7 +387,7 @@ void CDockWidgetTab::mouseMoveEvent(QMouseEvent* ev)
     	return;
 	}
     else if (d->DockArea->openDockWidgetsCount() > 1
-     && (ev->pos() - d->DragStartMousePosition).manhattanLength() >= QApplication::startDragDistance()) // Wait a few pixels before start moving
+     && (ev->globalPos() - 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
@@ -424,15 +412,21 @@ void CDockWidgetTab::contextMenuEvent(QContextMenuEvent* ev)
 		return;
 	}
 
-	d->DragStartMousePosition = ev->pos();
+	d->GlobalDragStartMousePosition = ev->globalPos();
 	QMenu Menu(this);
+
+    const bool isFloatable = d->DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable);
+    const bool isNotOnlyTabInContainer =  !d->DockArea->dockContainer()->hasTopLevelDockWidget();
+
+    const bool isDetachable = isFloatable && isNotOnlyTabInContainer;
+
 	auto Action = Menu.addAction(tr("Detach"), this, SLOT(detachDockWidget()));
-	Action->setEnabled(d->DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable));
+    Action->setEnabled(isDetachable);
 	Menu.addSeparator();
 	Action = Menu.addAction(tr("Close"), this, SIGNAL(closeRequested()));
 	Action->setEnabled(isClosable());
 	Menu.addAction(tr("Close Others"), this, SIGNAL(closeOtherTabsRequested()));
-	Menu.exec(mapToGlobal(ev->pos()));
+	Menu.exec(ev->globalPos());
 }
 
 
@@ -462,6 +456,7 @@ void CDockWidgetTab::setActiveTab(bool active)
 	d->TitleLabel->style()->unpolish(d->TitleLabel);
 	d->TitleLabel->style()->polish(d->TitleLabel);
 	update();
+	updateGeometry();
 
 	emit activeTabChanged();
 }
@@ -502,9 +497,7 @@ void CDockWidgetTab::setIcon(const QIcon& Icon)
 		d->IconLabel = new QLabel();
 		d->IconLabel->setAlignment(Qt::AlignVCenter);
 		d->IconLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred);
-		#ifndef QT_NO_TOOLTIP
-		d->IconLabel->setToolTip(d->TitleLabel->toolTip());
-		#endif
+		internal::setToolTip(d->IconLabel, d->TitleLabel->toolTip());
 		Layout->insertWidget(0, d->IconLabel, Qt::AlignVCenter);
 		Layout->insertSpacing(1, qRound(1.5 * Layout->contentsMargins().left() / 2.0));
 	}
@@ -549,7 +542,7 @@ void CDockWidgetTab::mouseDoubleClickEvent(QMouseEvent *event)
 	if ((!d->DockArea->dockContainer()->isFloating() || d->DockArea->dockWidgetsCount() > 1)
 		&& d->DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable))
 	{
-		d->DragStartMousePosition = event->pos();
+		d->GlobalDragStartMousePosition = event->globalPos();
 		d->startFloating(DraggingInactive);
 	}
 
@@ -571,6 +564,11 @@ void CDockWidgetTab::setText(const QString& title)
 	d->TitleLabel->setText(title);
 }
 
+bool CDockWidgetTab::isTitleElided() const
+{
+	return d->TitleLabel->isElided();
+}
+
 
 
 //============================================================================
@@ -587,7 +585,7 @@ void CDockWidgetTab::detachDockWidget()
 	{
 		return;
 	}
-	d->DragStartMousePosition = mapFromGlobal(QCursor::pos());
+	d->GlobalDragStartMousePosition = QCursor::pos();
 	d->startFloating(DraggingInactive);
 }
 
@@ -595,13 +593,13 @@ void CDockWidgetTab::detachDockWidget()
 //============================================================================
 bool CDockWidgetTab::event(QEvent *e)
 {
-	#ifndef QT_NO_TOOLTIP
+#ifndef QT_NO_TOOLTIP
 	if (e->type() == QEvent::ToolTipChange)
 	{
 		const auto text = toolTip();
 		d->TitleLabel->setToolTip(text);
 	}
-	#endif
+#endif
 	return Super::event(e);
 }
 

src/DockWidgetTab.h

@@ -94,11 +94,6 @@ public:
 	 */
 	void setActiveTab(bool active);
 
-	/**
-	 * Returns the dock widget this title widget belongs to
-	 */
-	CDockWidget* dockWidget() const;
-
 	/**
 	 * Sets the dock area widget the dockWidget returned by dockWidget()
 	 * function belongs to.
@@ -112,6 +107,11 @@ public:
 	 */
 	CDockAreaWidget* dockAreaWidget() const;
 
+	/**
+	 * Returns the dock widget this title widget belongs to
+	 */
+	CDockWidget* dockWidget() const;
+
 	/**
 	 * Sets the icon to show in title bar
 	 */
@@ -133,7 +133,12 @@ public:
 	void setText(const QString& title);
 
 	/**
-	 * This function returns true if the assigned dock widget is closeable
+	 * Returns true if text is elided on the tab's title
+	 */
+	bool isTitleElided() const;
+
+	/**
+	 * This function returns true if the assigned dock widget is closable
 	 */
 	bool isClosable() const;
 
@@ -152,6 +157,7 @@ signals:
 	void closeRequested();
 	void closeOtherTabsRequested();
 	void moved(const QPoint& GlobalPos);
+	void elidedChanged(bool elided);
 }; // class DockWidgetTab
 }
  // namespace ads

src/ElidingLabel.cpp

@@ -41,6 +41,7 @@ struct ElidingLabelPrivate
 	CElidingLabel* _this;
 	Qt::TextElideMode ElideMode = Qt::ElideNone;
 	QString Text;
+	bool IsElided = false;
 
 	ElidingLabelPrivate(CElidingLabel* _public) : _this(_public) {}
 
@@ -69,6 +70,12 @@ void ElidingLabelPrivate::elideText(int Width)
     {
     	str = Text.at(0);
     }
+    bool WasElided = IsElided;
+    IsElided = str != Text;
+    if(IsElided != WasElided)
+    {
+        emit _this->elidedChanged(IsElided);
+    }
     _this->QLabel::setText(str);
 }
 
@@ -88,9 +95,7 @@ CElidingLabel::CElidingLabel(const QString& text, QWidget* parent, Qt::WindowFla
 	  d(new ElidingLabelPrivate(this))
 {
 	d->Text = text;
-#ifndef QT_NO_TOOLTIP
-	setToolTip(text);
-#endif
+	internal::setToolTip(this, text);
 }
 
 
@@ -115,6 +120,12 @@ void CElidingLabel::setElideMode(Qt::TextElideMode mode)
 	d->elideText(size().width());
 }
 
+//============================================================================
+bool CElidingLabel::isElided() const
+{
+	return d->IsElided;
+}
+
 
 //============================================================================
 void CElidingLabel::mouseReleaseEvent(QMouseEvent* event)
@@ -193,9 +204,7 @@ void CElidingLabel::setText(const QString &text)
 	else
 	{
 		d->Text = text;
-#ifndef QT_NO_TOOLTIP
-		setToolTip( text );
-#endif
+		internal::setToolTip(this, text);
 		d->elideText(this->size().width());
 	}
 }

src/ElidingLabel.h

@@ -73,6 +73,10 @@ public:
 	 */
 	void setElideMode(Qt::TextElideMode mode);
 
+	/**
+	 * This function indicates whether the text on this label is currently elided
+	 */
+	bool isElided() const;
 
 public: // reimplements QLabel ----------------------------------------------
 	virtual QSize minimumSizeHint() const override;
@@ -91,6 +95,11 @@ signals:
 	 * This signal is emitted if the user does a double click on the label
 	 */
 	void doubleClicked();
+    
+    /**
+	 * This signal is emitted when isElided() state of this label is changed
+	 */
+	void elidedChanged(bool elided);
 }; //class CElidingLabel
 
 } // namespace QtLabb

src/FloatingDockContainer.cpp

@@ -28,6 +28,8 @@
 //============================================================================
 #include "FloatingDockContainer.h"
 
+#include <iostream>
+
 #include <QBoxLayout>
 #include <QApplication>
 #include <QMouseEvent>
@@ -77,6 +79,14 @@ struct FloatingDockContainerPrivate
 	void titleMouseReleaseEvent();
 	void updateDropOverlays(const QPoint &GlobalPos);
 
+	/**
+	 * Returns true if the given config flag is set
+	 */
+	static bool testConfigFlag(CDockManager::eConfigFlag Flag)
+	{
+		return CDockManager::configFlags().testFlag(Flag);
+	}
+
 	/**
 	 * Tests is a certain state is active
 	 */
@@ -98,6 +108,31 @@ struct FloatingDockContainerPrivate
 		_this->setWindowTitle(Text);
 #endif
 	}
+
+	void reflectCurrentWidget(CDockWidget* CurrentWidget)
+	{
+		// reflect CurrentWidget's title if configured to do so, otherwise display application name as window title
+		if (testConfigFlag(CDockManager::FloatingContainerHasWidgetTitle))
+		{
+			setWindowTitle(CurrentWidget->windowTitle());
+		}
+		else
+		{
+			setWindowTitle(qApp->applicationDisplayName());
+		}
+
+		// reflect CurrentWidget's icon if configured to do so, otherwise display application icon as window icon
+		QIcon CurrentWidgetIcon = CurrentWidget->icon();
+		if (testConfigFlag(CDockManager::FloatingContainerHasWidgetIcon)
+				&& !CurrentWidgetIcon.isNull())
+		{
+			_this->setWindowIcon(CurrentWidget->icon());
+		}
+		else
+		{
+			_this->setWindowIcon(QApplication::windowIcon());
+		}
+	}
 };
 // struct FloatingDockContainerPrivate
 
@@ -205,7 +240,7 @@ void FloatingDockContainerPrivate::updateDropOverlays(const QPoint &GlobalPos)
 	{
 		DockAreaOverlay->enableDropPreview(true);
 		DockAreaOverlay->setAllowedAreas(
-		    (VisibleDockAreas == 1) ? NoDockWidgetArea : AllDockAreas);
+		    (VisibleDockAreas == 1) ? NoDockWidgetArea : DockArea->allowedAreas());
 		DockWidgetArea Area = DockAreaOverlay->showOverlay(DockArea);
 
 		// A CenterDockWidgetArea for the dockAreaOverlay() indicates that
@@ -352,14 +387,17 @@ void CFloatingDockContainer::closeEvent(QCloseEvent *event)
 {
 	ADS_PRINT("CFloatingDockContainer closeEvent");
 	d->setState(DraggingInactive);
+	event->ignore();
 
 	if (isClosable())
 	{
 		auto TopLevelDockWidget = topLevelDockWidget();
 		if (TopLevelDockWidget && TopLevelDockWidget->features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
 		{
-			TopLevelDockWidget->deleteDockWidget();
-			this->deleteLater();
+			if (!TopLevelDockWidget->closeDockWidgetInternal())
+			{
+				return;
+			}
 		}
 
 		// In Qt version after 5.9.2 there seems to be a bug that causes the
@@ -371,20 +409,7 @@ void CFloatingDockContainer::closeEvent(QCloseEvent *event)
 		// Starting from Qt version 5.12.2 this seems to work again. But
 		// now the QEvent::NonClientAreaMouseButtonPress function returns always
 		// Qt::RightButton even if the left button was pressed
-#ifndef Q_OS_LINUX
-#if (QT_VERSION > QT_VERSION_CHECK(5, 9, 2) && QT_VERSION < QT_VERSION_CHECK(5, 12, 2))
-        event->ignore();
         this->hide();
-#else
-		Super::closeEvent(event);
-#endif
-#else // Q_OS_LINUX
-        Super::closeEvent(event);
-#endif
-	}
-	else
-	{
-		event->ignore();
 	}
 }
 
@@ -545,8 +570,8 @@ void CFloatingDockContainer::onDockAreasAddedOrRemoved()
 	if (TopLevelDockArea)
 	{
 		d->SingleDockArea = TopLevelDockArea;
-		d->setWindowTitle(
-		    d->SingleDockArea->currentDockWidget()->windowTitle());
+		CDockWidget* CurrentWidget = d->SingleDockArea->currentDockWidget();
+		d->reflectCurrentWidget(CurrentWidget);
 		connect(d->SingleDockArea, SIGNAL(currentChanged(int)), this,
 		    SLOT(onDockAreaCurrentChanged(int)));
 	}
@@ -559,6 +584,7 @@ void CFloatingDockContainer::onDockAreasAddedOrRemoved()
 			d->SingleDockArea = nullptr;
 		}
 		d->setWindowTitle(qApp->applicationDisplayName());
+		setWindowIcon(QApplication::windowIcon());
 	}
 }
 
@@ -568,11 +594,13 @@ void CFloatingDockContainer::updateWindowTitle()
 	auto TopLevelDockArea = d->DockContainer->topLevelDockArea();
 	if (TopLevelDockArea)
 	{
-		d->setWindowTitle(TopLevelDockArea->currentDockWidget()->windowTitle());
+		CDockWidget* CurrentWidget = TopLevelDockArea->currentDockWidget();
+		d->reflectCurrentWidget(CurrentWidget);
 	}
 	else
 	{
 		d->setWindowTitle(qApp->applicationDisplayName());
+		setWindowIcon(QApplication::windowIcon());
 	}
 }
 
@@ -580,7 +608,8 @@ void CFloatingDockContainer::updateWindowTitle()
 void CFloatingDockContainer::onDockAreaCurrentChanged(int Index)
 {
 	Q_UNUSED(Index);
-	d->setWindowTitle(d->SingleDockArea->currentDockWidget()->windowTitle());
+	CDockWidget* CurrentWidget = d->SingleDockArea->currentDockWidget();
+	d->reflectCurrentWidget(CurrentWidget);
 }
 
 //============================================================================

src/FloatingDockContainer.h

@@ -157,7 +157,7 @@ protected:
 	 * Moves the widget to a new position relative to the position given when
 	 * startFloating() was called
 	 */
-	void moveFloating();
+	void moveFloating() override;
 
 	/**
 	 * Restores the state from given stream.

src/FloatingDragPreview.cpp

@@ -127,7 +127,7 @@ void FloatingDragPreviewPrivate::updateDropOverlays(const QPoint &GlobalPos)
 	{
 		DockAreaOverlay->enableDropPreview(true);
 		DockAreaOverlay->setAllowedAreas(
-		    (VisibleDockAreas == 1) ? NoDockWidgetArea : AllDockAreas);
+		    (VisibleDockAreas == 1) ? NoDockWidgetArea : DockArea->allowedAreas());
 		DockWidgetArea Area = DockAreaOverlay->showOverlay(DockArea);
 
 		// A CenterDockWidgetArea for the dockAreaOverlay() indicates that
@@ -206,13 +206,6 @@ CFloatingDragPreview::CFloatingDragPreview(QWidget* Content, QWidget* parent) :
 
 	connect(qApp, SIGNAL(applicationStateChanged(Qt::ApplicationState)),
 		SLOT(onApplicationStateChanged(Qt::ApplicationState)));
-
-#ifdef Q_OS_LINUX
-    // In Windows this widget directly receives the escape key press events
-    // in Linux we need to install an event filter for the given Content
-    // widget to receive the escape key press
-    Content->installEventFilter(this);
-#endif
 }
 
 
@@ -227,6 +220,10 @@ CFloatingDragPreview::CFloatingDragPreview(CDockWidget* Content)
 		d->ContenSourceContainer = Content->dockContainer();
 	}
 	setWindowTitle(Content->windowTitle());
+
+	// We need to install an event filter for the given Content
+	// widget to receive the escape key press
+	Content->dockAreaWidget()->installEventFilter(this);
 }
 
 
@@ -238,6 +235,10 @@ CFloatingDragPreview::CFloatingDragPreview(CDockAreaWidget* Content)
 	d->ContentSourceArea = Content;
 	d->ContenSourceContainer = Content->dockContainer();
 	setWindowTitle(Content->currentDockWidget()->windowTitle());
+
+	// We need to install an event filter for the given Content
+	// widget to receive the escape key press
+	Content->installEventFilter(this);
 }
 
 
@@ -294,25 +295,33 @@ void CFloatingDragPreview::finishDragging()
 	else
 	{
 		CDockWidget* DockWidget = qobject_cast<CDockWidget*>(d->Content);
-		CFloatingDockContainer* FloatingWidget;
-		if (DockWidget)
+		CFloatingDockContainer* FloatingWidget = nullptr;
+
+		if (DockWidget && DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable))
 		{
 			FloatingWidget = new CFloatingDockContainer(DockWidget);
 		}
 		else
 		{
 			CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(d->Content);
-			FloatingWidget = new CFloatingDockContainer(DockArea);
+			if (DockArea->features().testFlag(CDockWidget::DockWidgetFloatable))
+			{
+				FloatingWidget = new CFloatingDockContainer(DockArea);
+			}
 		}
-		FloatingWidget->setGeometry(this->geometry());
-		FloatingWidget->show();
-		if (!CDockManager::configFlags().testFlag(CDockManager::DragPreviewHasWindowFrame))
+
+		if (FloatingWidget)
 		{
-			QApplication::processEvents();
-			int FrameHeight = FloatingWidget->frameGeometry().height() - FloatingWidget->geometry().height();
-			QRect FixedGeometry = this->geometry();
-			FixedGeometry.adjust(0, FrameHeight, 0, 0);
-			FloatingWidget->setGeometry(FixedGeometry);
+			FloatingWidget->setGeometry(this->geometry());
+			FloatingWidget->show();
+			if (!CDockManager::configFlags().testFlag(CDockManager::DragPreviewHasWindowFrame))
+			{
+				QApplication::processEvents();
+				int FrameHeight = FloatingWidget->frameGeometry().height() - FloatingWidget->geometry().height();
+				QRect FixedGeometry = this->geometry();
+				FixedGeometry.adjust(0, FrameHeight, 0, 0);
+				FloatingWidget->setGeometry(FixedGeometry);
+			}
 		}
 	}
 
@@ -355,18 +364,6 @@ void CFloatingDragPreview::paintEvent(QPaintEvent* event)
 	}
 }
 
-
-//============================================================================
-void CFloatingDragPreview::keyPressEvent(QKeyEvent *event)
-{
-	Super::keyPressEvent(event);
-	if (event->key() == Qt::Key_Escape)
-	{
-		d->cancelDragging();
-	}
-}
-
-
 //============================================================================
 void CFloatingDragPreview::onApplicationStateChanged(Qt::ApplicationState state)
 {
@@ -388,7 +385,7 @@ bool CFloatingDragPreview::eventFilter(QObject *watched, QEvent *event)
         QKeyEvent* e = static_cast<QKeyEvent*>(event);
         if (e->key() == Qt::Key_Escape)
         {
-            d->Content->removeEventFilter(this);
+            watched->removeEventFilter(this);
             d->cancelDragging();
         }
     }

src/FloatingDragPreview.h

@@ -30,7 +30,7 @@ class CFloatingDragPreview : public QWidget, public IFloatingWidget
 	Q_OBJECT
 private:
 	FloatingDragPreviewPrivate* d;
-	friend class FloatingDragPreviewPrivate;
+	friend struct FloatingDragPreviewPrivate;
 
 private slots:
 	/**
@@ -49,11 +49,6 @@ protected:
 	 */
 	virtual void paintEvent(QPaintEvent *e) override;
 
-	/**
-	 * Cancel non opaque undocking with escape key
-	 */
-	virtual void keyPressEvent(QKeyEvent *event) override;
-
 	/**
 	 * The content is a DockArea or a DockWidget
 	 */

src/IconProvider.h

@@ -29,7 +29,7 @@ class ADS_EXPORT CIconProvider
 {
 private:
 	IconProviderPrivate* d; ///< private data (pimpl)
-	friend class IconProviderPrivate;
+	friend struct IconProviderPrivate;
 
 public:
 	/**

src/ads_globals.cpp

@@ -30,8 +30,11 @@
 //============================================================================
 #include <QVariant>
 #include <QPainter>
+#include <QAbstractButton>
 
 #include "DockSplitter.h"
+#include "DockManager.h"
+#include "IconProvider.h"
 #include "ads_globals.h"
 
 
@@ -90,6 +93,31 @@ void hideEmptyParentSplitters(CDockSplitter* Splitter)
 	}
 }
 
+
+//============================================================================
+void setButtonIcon(QAbstractButton* Button, QStyle::StandardPixmap StandarPixmap,
+	ads::eIcon CustomIconId)
+{
+	// First we try to use custom icons if available
+	QIcon Icon = CDockManager::iconProvider().customIcon(CustomIconId);
+	if (!Icon.isNull())
+	{
+		Button->setIcon(Icon);
+		return;
+	}
+
+#ifdef Q_OS_LINUX
+	Button->setIcon(Button->style()->standardIcon(StandarPixmap));
+#else
+	// The standard icons does not look good on high DPI screens so we create
+	// our own "standard" icon here.
+	QPixmap normalPixmap = Button->style()->standardPixmap(StandarPixmap, 0, Button);
+	Icon.addPixmap(internal::createTransparentPixmap(normalPixmap, 0.25), QIcon::Disabled);
+	Icon.addPixmap(normalPixmap, QIcon::Normal);
+	Button->setIcon(Icon);
+#endif
+}
+
 } // namespace internal
 } // namespace ads
 

src/ads_globals.h

@@ -35,6 +35,9 @@
 #include <QPixmap>
 #include <QWidget>
 #include <QDebug>
+#include <QStyle>
+
+class QAbstractButton;
 
 #ifndef ADS_STATIC
 #ifdef ADS_SHARED_EXPORT
@@ -117,6 +120,15 @@ enum eIcon
 	IconCount,         //!< just a delimiter for range checks
 };
 
+/**
+ * For bitwise combination of dock wdget features
+ */
+enum eBitwiseOperator
+{
+	BitwiseAnd,
+	BitwiseOr
+};
+
 namespace internal
 {
 static const bool RestoreTesting = true;
@@ -206,6 +218,39 @@ void setFlag(T& Flags, typename T::enum_type flag, bool on = true)
 #endif
 }
 
+
+/**
+ * Helper function for settings tooltips without cluttering the code with
+ * tests for preprocessor macros
+ */
+template <class QObjectPtr>
+void setToolTip(QObjectPtr obj, const QString &tip)
+{
+#ifndef QT_NO_TOOLTIP
+	obj->setToolTip(tip);
+#else
+	Q_UNUSED(obj);
+	Q_UNUSED(tip);
+#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.
+ * The function first uses the CustomIconId to get an icon from the
+ * CIconProvider. You can register your custom icons with the icon provider, if
+ * you do not want to use the default buttons and if you do not want to use
+ * stylesheets.
+ * If the IconProvider does not return a valid icon (icon is null), the function
+ * fetches the given standard pixmap from the QStyle.
+ * param[in] Button The button whose icons are to be set
+ * param[in] StandardPixmap The standard pixmap to be used for the button
+ * param[in] CustomIconId The identifier for the custom icon.
+ */
+void setButtonIcon(QAbstractButton* Button, QStyle::StandardPixmap StandarPixmap,
+	ads::eIcon CustomIconId);
+
 } // namespace internal
 } // namespace ads
 

src/src.pro

@@ -43,7 +43,8 @@ HEADERS += \
     DockSplitter.h \
     DockAreaTitleBar.h \
     ElidingLabel.h \
-    IconProvider.h
+    IconProvider.h \
+    DockComponentsFactory.h 
 
 
 SOURCES += \
@@ -61,7 +62,8 @@ SOURCES += \
     DockSplitter.cpp \
     DockAreaTitleBar.cpp \
     ElidingLabel.cpp \
-    IconProvider.cpp
+    IconProvider.cpp \
+    DockComponentsFactory.cpp
 
 
 unix {

src/stylesheets/default.css

@@ -59,11 +59,9 @@ ads--CDockWidget
     border-width: 1px 0 0 0;
 }
 
-#tabsMenuButton,
-#closeButton,
-#undockButton
+ads--CTitleBarButton
 {
-	padding: 0px -2px;
+	padding: 0px 0px;
 }
 
 

src/stylesheets/default_linux.css

@@ -59,14 +59,14 @@ ads--CDockWidget
     border-width: 1px 0 0 0;
 }
 
-#tabsMenuButton,
-#closeButton,
-#undockButton
+
+ads--CTitleBarButton
 {
-	padding: 0px -2px;
+	padding: 0px 0px;
 }
 
 
+
 QScrollArea#dockWidgetScrollArea
 {
 	padding: 0px;