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

Now setWidget properly supports ItemViews like QTreeView or QTableView

README.md

@@ -4,6 +4,9 @@
 [![Build status](https://ci.appveyor.com/api/projects/status/qcfb3cy932jw9mpy/branch/master?svg=true)](https://ci.appveyor.com/project/githubuser0xFFFF/qt-advanced-docking-system/branch/master)
 [![License: LGPL v2.1](https://img.shields.io/badge/License-LGPL%20v2.1-blue.svg)](gnu-lgpl-v2.1.md)
 
+[What's new](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/releases/latest) •
+[Documentation](doc/user-guide.md)
+
 Qt Advanced Docking System lets you create customizable layouts using a full 
 featured window docking system similar to what is found in many popular 
 integrated development environments (IDEs) such as Visual Studio. 
@@ -24,30 +27,33 @@ of his docking system project.
 
 ### 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)
-  - [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)
+- [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)
+- [Showcase](#showcase)
+  - [Qt Creator IDE](#qt-creator-ide)
+  - [Qt Design Studio](#qt-design-studio)
+  - [QmixElements](#qmixelements)
 
 ### Docking everywhere - no central widget
 
@@ -273,3 +279,28 @@ If this project help you reduce time to develop or if you just like it, you can
 <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>
+
+## Showcase
+
+### [Qt Creator IDE](https://www.qt.io/development-tools)
+
+From version 4.12 on, Qt Creator uses the Advanced Docking Framework for its
+Qt Quick Designer. This improves the usability when using multiple screens.
+
+![Qt Creator](doc/qtcreator.png)
+
+### [Qt Design Studio](https://www.qt.io/ui-design-tools)
+
+Taken from the [Qt Blog](https://www.qt.io/blog/qt-design-studio-1.5-beta-released):
+
+> The most obvious change in [Qt Design Studio 1.5](https://www.qt.io/blog/qt-design-studio-1.5-beta-released) is the integration of dock widgets using the Qt Advanced Docking System. This allows the user to fully customize the workspace and also to undock any view into its own top level window. This especially improves the usability when using multiple screens.
+
+![Qt Design Studio](doc/qt_design_studio.png)
+
+### [QmixElements](https://www.cetoni.com/products/qmixelements/)
+
+The QmixElements software from [CETONI](https://www.cetoni.com) is a comprehensive, 
+plugin-based and modular laboratory automation software for controlling CETONI devices using a joint graphical user interface. The software features a powerful script system to automate processes. This [blog post](https://www.cetoni.com/blog/qmixelements-advanced-docking-system/) gives a nice overview about the use of the Qt
+Advanced Docking System in the QmixElements sofware.
+
+![QmixElements](doc/qmix_elements.png)

demo/CMakeLists.txt

@@ -30,6 +30,8 @@ set(ads_demo_SRCS
     main.cpp
     MainWindow.cpp
     mainwindow.ui
+    StatusDialog.cpp
+    StatusDialog.ui
 	demo.qrc
 )
 add_executable(AdvancedDockingSystemDemo WIN32 ${ads_demo_SRCS})

demo/MainWindow.cpp

@@ -74,6 +74,7 @@
 #include "DockAreaTabBar.h"
 #include "FloatingDockContainer.h"
 #include "DockComponentsFactory.h"
+#include "StatusDialog.h"
 
 
 
@@ -169,7 +170,12 @@ static ads::CDockWidget* createCalendarDockWidget(QMenu* ViewMenu)
 	static int CalendarCount = 0;
 	QCalendarWidget* w = new QCalendarWidget();
 	ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Calendar %1").arg(CalendarCount++));
+	// The following lines are for testing the setWidget() and takeWidget()
+	// functionality
 	DockWidget->setWidget(w);
+	DockWidget->setWidget(w); // what happens if we set a widget if a widget is already set
+	DockWidget->takeWidget(); // we remove the widget
+	DockWidget->setWidget(w); // and set the widget again - there should be no error
 	DockWidget->setToggleViewActionMode(ads::CDockWidget::ActionModeShow);
 	DockWidget->setIcon(svgIcon(":/adsdemo/images/date_range.svg"));
 	ViewMenu->addAction(DockWidget->toggleViewAction());
@@ -224,11 +230,27 @@ static ads::CDockWidget* createEditorWidget(QMenu* ViewMenu)
 }
 
 
+//===========================================================================
+/**
+ * Custom QTableWidget with a minimum size hint to test CDockWidget
+ * setMinimumSizeHintMode() function of CDockWidget
+ */
+class CMinSizeTableWidget : public QTableWidget
+{
+public:
+	using QTableWidget::QTableWidget;
+	virtual QSize minimumSizeHint() const override
+	{
+		return QSize(300, 100);
+	}
+};
+
+
 //============================================================================
 static ads::CDockWidget* createTableWidget(QMenu* ViewMenu)
 {
 	static int TableCount = 0;
-	QTableWidget* w = new QTableWidget();
+	auto w = new CMinSizeTableWidget();
 	ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Table %1").arg(TableCount++));
 	static int colCount = 5;
 	static int rowCount = 30;
@@ -244,6 +266,20 @@ static ads::CDockWidget* createTableWidget(QMenu* ViewMenu)
 	}
 	DockWidget->setWidget(w);
 	DockWidget->setIcon(svgIcon(":/adsdemo/images/grid_on.svg"));
+	DockWidget->setMinimumSizeHintMode(ads::CDockWidget::MinimumSizeHintFromContent);
+	auto ToolBar = DockWidget->createDefaultToolBar();
+	auto Action = ToolBar->addAction(svgIcon(":/adsdemo/images/fullscreen.svg"), "Toggle Fullscreen");
+	QObject::connect(Action, &QAction::triggered, [=]()
+		{
+			if (DockWidget->isFullScreen())
+			{
+				DockWidget->showNormal();
+			}
+			else
+			{
+				DockWidget->showFullScreen();
+			}
+		});
 	ViewMenu->addAction(DockWidget->toggleViewAction());
 	return DockWidget;
 }
@@ -316,8 +352,6 @@ void MainWindowPrivate::createContent()
 	QMenu* ViewMenu = ui.menuView;
 	auto DockWidget = createCalendarDockWidget(ViewMenu);
 	DockWidget->setFeature(ads::CDockWidget::DockWidgetClosable, false);
-	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):
@@ -351,9 +385,6 @@ void MainWindowPrivate::createContent()
 	// 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"));
 	auto DockArea = DockManager->addDockWidget(ads::CenterDockWidgetArea, DockWidget, TopDockArea);
 
@@ -363,6 +394,7 @@ void MainWindowPrivate::createContent()
 	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);
@@ -381,8 +413,12 @@ void MainWindowPrivate::createContent()
 	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()));
+    auto Action = ui.menuTests->addAction(QString("Set %1 Floating").arg(DockWidget->windowTitle()));
     DockWidget->connect(Action, SIGNAL(triggered()), SLOT(setFloating()));
+    Action = ui.menuTests->addAction(QString("Set %1 As Current Tab").arg(DockWidget->windowTitle()));
+    DockWidget->connect(Action, SIGNAL(triggered()), SLOT(setAsCurrentTab()));
+    Action = ui.menuTests->addAction(QString("Raise %1").arg(DockWidget->windowTitle()));
+    DockWidget->connect(Action, SIGNAL(triggered()), SLOT(raise()));
 
 #ifdef Q_OS_WIN
     if (!DockManager->configFlags().testFlag(ads::CDockManager::OpaqueUndocking))
@@ -424,11 +460,18 @@ void MainWindowPrivate::createActions()
 	a->setToolTip("Creates floating dynamic dockable editor windows that are deleted on close");
 	a->setIcon(svgIcon(":/adsdemo/images/note_add.svg"));
 	_this->connect(a, SIGNAL(triggered()), SLOT(createEditor()));
+	ui.menuTests->addAction(a);
 
 	a = ui.toolBar->addAction("Create Table");
 	a->setToolTip("Creates floating dynamic dockable table with millions of entries");
 	a->setIcon(svgIcon(":/adsdemo/images/grid_on.svg"));
 	_this->connect(a, SIGNAL(triggered()), SLOT(createTable()));
+	ui.menuTests->addAction(a);
+
+	ui.menuTests->addSeparator();
+	a = ui.menuTests->addAction("Show Status Dialog");
+	_this->connect(a, SIGNAL(triggered()), SLOT(showStatusDialog()));
+	ui.menuTests->addSeparator();
 }
 
 
@@ -479,7 +522,7 @@ CMainWindow::CMainWindow(QWidget *parent) :
 {
 	using namespace ads;
 	d->ui.setupUi(this);
-
+	setWindowTitle(QApplication::instance()->applicationName());
 	d->createActions();
 
 	// uncomment the following line if the tab close button should be
@@ -488,7 +531,7 @@ CMainWindow::CMainWindow(QWidget *parent) :
 
     // uncomment the following line if you want to use opaque undocking and
 	// opaque splitter resizing
-    //CDockManager::setConfigFlags(CDockManager::DefaultOpaqueConfig);
+    // 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
@@ -515,13 +558,14 @@ CMainWindow::CMainWindow(QWidget *parent) :
 	// 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);
 
+	// uncomment the following line if you want a central widget in the main dock container (the dock manager) without a titlebar
+	// If you enable this code, you can test it in the demo with the Calendar 0
+	// dock widget.
+	// CDockManager::setConfigFlag(CDockManager::HideSingleCentralWidgetTitleBar, 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
-	// area close button closes the active tab
-	// CDockManager::setConfigFlags({CDockManager::DockAreaHasCloseButton
-	//	| CDockManager::DockAreaCloseButtonClosesTab});
 	connect(d->PerspectiveComboBox, SIGNAL(activated(const QString&)),
 		d->DockManager, SLOT(openPerspective(const QString&)));
 
@@ -648,3 +692,11 @@ void CMainWindow::createTable()
     FloatingWidget->move(QPoint(40, 40));
 }
 
+
+//============================================================================
+void CMainWindow::showStatusDialog()
+{
+	CStatusDialog Dialog(d->DockManager);
+	Dialog.exec();
+}
+

demo/MainWindow.h

@@ -63,6 +63,7 @@ private slots:
 	void createEditor();
 	void createTable();
 	void onEditorCloseRequested();
+	void showStatusDialog();
 };
 
 #endif // MAINWINDOW_H

demo/StatusDialog.cpp

@@ -0,0 +1,88 @@
+//============================================================================
+/// \file   StatusDialog.cpp
+/// \author Uwe Kindler
+/// \date   13.04.2020
+/// \brief  Implementation of CStatusDialog class
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include "StatusDialog.h"
+
+#include <iostream>
+
+#include "DockManager.h"
+#include "DockWidget.h"
+#include "ui_StatusDialog.h"
+
+/**
+ * Private data class of CStatusDialog class (pimpl)
+ */
+struct StatusDialogPrivate
+{
+	CStatusDialog *_this;
+	Ui::CStatusDialogClass ui;
+	ads::CDockManager* DockManager;
+	QMap<QString, ads::CDockWidget*> DockWidgets;
+
+	/**
+	 * Private data constructor
+	 */
+	StatusDialogPrivate(CStatusDialog *_public);
+};
+// struct StatusDialogPrivate
+
+//============================================================================
+StatusDialogPrivate::StatusDialogPrivate(CStatusDialog *_public) :
+	_this(_public)
+{
+
+}
+
+//============================================================================
+CStatusDialog::CStatusDialog(ads::CDockManager* DockManager) :
+	QDialog(DockManager),
+	d(new StatusDialogPrivate(this))
+{
+	d->ui.setupUi(this);
+	d->DockManager = DockManager;
+	d->DockWidgets = DockManager->dockWidgetsMap();
+
+	for (auto it = d->DockWidgets.begin(); it != d->DockWidgets.end(); ++it)
+	{
+		QVariant vDockWidget = QVariant::fromValue(it.value());
+		d->ui.dockWidgetsComboBox->addItem(it.key(), vDockWidget);
+	}
+}
+
+//============================================================================
+CStatusDialog::~CStatusDialog()
+{
+	delete d;
+}
+
+
+//============================================================================
+void CStatusDialog::on_dockWidgetsComboBox_currentIndexChanged(int index)
+{
+	if (index < 0)
+	{
+		return;
+	}
+
+	auto vDockWidget = d->ui.dockWidgetsComboBox->currentData();
+	auto DockWidget = vDockWidget.value<ads::CDockWidget*>();
+	d->ui.isClosedCheckBox->setChecked(DockWidget->isClosed());
+	d->ui.isFloatingCheckBox->setChecked(DockWidget->isFloating());
+	d->ui.tabbedCheckBox->setChecked(DockWidget->isTabbed());
+	d->ui.isCurrentTabCheckBox->setChecked(DockWidget->isCurrentTab());
+	d->ui.closableCheckBox->setChecked(DockWidget->features().testFlag(ads::CDockWidget::DockWidgetClosable));
+	d->ui.movableCheckBox->setChecked(DockWidget->features().testFlag(ads::CDockWidget::DockWidgetMovable));
+	d->ui.floatableCheckBox->setChecked(DockWidget->features().testFlag(ads::CDockWidget::DockWidgetFloatable));
+	d->ui.deleteOnCloseCheckBox->setChecked(DockWidget->features().testFlag(ads::CDockWidget::DockWidgetDeleteOnClose));
+	d->ui.customCloseHandlingCheckBox->setChecked(DockWidget->features().testFlag(ads::CDockWidget::CustomCloseHandling));
+}
+
+//---------------------------------------------------------------------------
+// EOF StatusDialog.cpp

demo/StatusDialog.h

@@ -0,0 +1,47 @@
+#ifndef StatusDialogH
+#define StatusDialogH
+//============================================================================
+/// \file   StatusDialog.h
+/// \author Uwe Kindler
+/// \date   13.04.2020
+/// \brief  Declaration of CStatusDialog class
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include <QDialog>
+
+namespace ads {class CDockManager;}
+struct StatusDialogPrivate;
+
+/**
+ * Displays status info about dock widgets
+ */
+class CStatusDialog : public QDialog
+{
+	Q_OBJECT
+private:
+	StatusDialogPrivate* d; ///< private data (pimpl)
+	friend class StatusDialogPrivate;
+
+private slots:
+	void on_dockWidgetsComboBox_currentIndexChanged(int index);
+
+protected:
+public:
+	using Super = QDialog;
+	/**
+	 * Default Constructor
+	 */
+	CStatusDialog(ads::CDockManager* parent);
+
+	/**
+	 * Virtual Destructor
+	 */
+	virtual ~CStatusDialog();
+}; // class StatusDialog
+
+ // namespace namespace_name
+//-----------------------------------------------------------------------------
+#endif // StatusDialogH

demo/StatusDialog.ui

@@ -0,0 +1,146 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>CStatusDialogClass</class>
+ <widget class="QDialog" name="CStatusDialogClass">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>357</width>
+    <height>331</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <property name="windowTitle">
+   <string>Dock Widget Status</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout_2">
+   <property name="sizeConstraint">
+    <enum>QLayout::SetFixedSize</enum>
+   </property>
+   <item>
+    <widget class="QLabel" name="dockWidgetLabel">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="text">
+      <string>Dock Widget:</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QComboBox" name="dockWidgetsComboBox">
+     <property name="minimumSize">
+      <size>
+       <width>300</width>
+       <height>0</height>
+      </size>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="statusGroupBox">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="title">
+      <string>Status</string>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout">
+      <item>
+       <widget class="QCheckBox" name="isClosedCheckBox">
+        <property name="text">
+         <string>closed</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QCheckBox" name="isFloatingCheckBox">
+        <property name="text">
+         <string>floating</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QCheckBox" name="tabbedCheckBox">
+        <property name="text">
+         <string>tabbed</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QCheckBox" name="isCurrentTabCheckBox">
+        <property name="text">
+         <string>is current tab</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="flagsGroupBox">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="title">
+      <string>Feature Flags</string>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout_3">
+      <item>
+       <widget class="QCheckBox" name="closableCheckBox">
+        <property name="text">
+         <string>DockWidgetClosable</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QCheckBox" name="movableCheckBox">
+        <property name="text">
+         <string>DockWidgetMovable</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QCheckBox" name="floatableCheckBox">
+        <property name="text">
+         <string>DockWidgetFloatable</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QCheckBox" name="deleteOnCloseCheckBox">
+        <property name="text">
+         <string>DockWidgetDeleteOnClose</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QCheckBox" name="customCloseHandlingCheckBox">
+        <property name="text">
+         <string>CustomCloseHandling</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

demo/demo.pro

@@ -18,13 +18,16 @@ adsBuildStatic {
 
 SOURCES += \
 	main.cpp \
-	MainWindow.cpp
+	MainWindow.cpp \
+	StatusDialog.cpp
 
 HEADERS += \
-	MainWindow.h
+	MainWindow.h \
+	StatusDialog.h
 
 FORMS += \
-	mainwindow.ui
+	mainwindow.ui \
+	StatusDialog.ui
 	
 RESOURCES += demo.qrc
 

demo/demo.qrc

@@ -13,5 +13,6 @@
         <file>app.css</file>
         <file>images/plus.svg</file>
         <file>images/help_outline.svg</file>
+        <file>images/fullscreen.svg</file>
     </qresource>
 </RCC>

demo/images/fullscreen.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>settings_overscan 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="M981.33,213.33v597.34c0,46.93 -38.4,85.33 -85.33,85.33h-768c-46.93,0 -85.33,-38.4 -85.33,-85.33v-597.34c0,-46.93 38.4,-85.33 85.33,-85.33h768c46.93,0 85.33,38.4 85.33,85.33zM896,212.91h-768v598.18h768zM256,597.33l-106.67,-84.9l106.67,-85.76zM597.33,341.33h-170.66l85.76,-106.66zM874.67,512.43l-106.67,84.9v-170.66zM512.43,789.33l-85.76,-106.66h170.66z"/>
+	</g>
+</svg>

demo/main.cpp

@@ -41,6 +41,7 @@ int main(int argc, char *argv[])
 #endif
 	std::shared_ptr<int> b;
 	QApplication a(argc, argv);
+	a.setApplicationName("Advanced Docking System Demo");
 	a.setQuitOnLastWindowClosed(true);
 
 	QFile StyleSheetFile(":/adsdemo/app.css");

demo/mainwindow.ui

@@ -31,7 +31,6 @@
     <property name="title">
      <string>File</string>
     </property>
-    <addaction name="actionExit"/>
     <addaction name="actionSaveState"/>
     <addaction name="actionRestoreState"/>
    </widget>
@@ -45,8 +44,14 @@
      <string>About</string>
     </property>
    </widget>
+   <widget class="QMenu" name="menuTests">
+    <property name="title">
+     <string>Tests</string>
+    </property>
+   </widget>
    <addaction name="menuFile"/>
    <addaction name="menuView"/>
+   <addaction name="menuTests"/>
    <addaction name="menuAbout"/>
   </widget>
   <widget class="QToolBar" name="toolBar">

doc/ads_qt_marketplace_description.md

@@ -14,18 +14,17 @@ styles as much as possible.
 
 ### 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)
+- [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
 
@@ -33,8 +32,8 @@ There is no central widget like in the Qt docking system. You can dock on every
 border of the main window or you can dock into each dock area - so you are
 free to dock almost everywhere.
 
-![Dropping widgets](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.png)
+
 ![Dropping widgets](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/preview-dragndrop_dark.png)
 
 ### Docking inside floating windows
@@ -42,8 +41,8 @@ free to dock almost everywhere.
 There is no difference between the main window and a floating window. Docking
 into floating windows is supported.
 
-![Docking inside floating windows](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.png)
+
 ![Docking inside floating windows](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/floating-widget-dragndrop_dark.png)
 
 ### Grouped dragging
@@ -52,8 +51,8 @@ When dragging the titlebar of a dock, all the tabs that are tabbed with it are
 going to be dragged. So you can move complete groups of tabbed widgets into
 a floating widget or from one dock area to another one.
 
-![Grouped dragging](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.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
@@ -64,8 +63,8 @@ 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.gif)
+
 ![Perspective](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/perspectives_dark.png)
 
 ### Opaque and non-opaque splitter resizing

doc/user-guide.md

@@ -0,0 +1,299 @@
+# User Guide
+
+- [Configuration Flags](#configuration-flags)
+  - [Setting Configuration Flags](#setting-configuration-flags)
+  - [`ActiveTabHasCloseButton`](#activetabhasclosebutton)
+  - [`DockAreaHasCloseButton`](#dockareahasclosebutton)
+  - [`DockAreaCloseButtonClosesTab`](#dockareaclosebuttonclosestab)
+  - [`OpaqueSplitterResize`](#opaquesplitterresize)
+  - [`XmlAutoFormattingEnabled`](#xmlautoformattingenabled)
+  - [`XmlCompressionEnabled`](#xmlcompressionenabled)
+  - [`TabCloseButtonIsToolButton`](#tabclosebuttonistoolbutton)
+  - [`AllTabsHaveCloseButton`](#alltabshaveclosebutton)
+  - [`RetainTabSizeWhenCloseButtonHidden`](#retaintabsizewhenclosebuttonhidden)
+  - [`OpaqueUndocking`](#opaqueundocking)
+  - [`DragPreviewIsDynamic`](#dragpreviewisdynamic)
+  - [`DragPreviewShowsContentPixmap`](#dragpreviewshowscontentpixmap)
+  - [`DragPreviewHasWindowFrame`](#dragpreviewhaswindowframe)
+  - [`AlwaysShowTabs`](#alwaysshowtabs)
+  - [`DockAreaHasUndockButton`](#dockareahasundockbutton)
+  - [`DockAreaHasTabsMenuButton`](#dockareahastabsmenubutton)
+  - [`DockAreaHideDisabledButtons`](#dockareahidedisabledbuttons)
+  - [`DockAreaDynamicTabsMenuButtonVisibility`](#dockareadynamictabsmenubuttonvisibility)
+  - [`FloatingContainerHasWidgetTitle`](#floatingcontainerhaswidgettitle)
+  - [`FloatingContainerHasWidgetIcon`](#floatingcontainerhaswidgeticon)
+  - [`HideSingleCentralWidgetTitleBar`](#hidesinglecentralwidgettitlebar)
+
+## Configuration Flags
+
+The Advanced Docking System has a number of global configuration options to
+configure the design and the functionality of the docking system. Each
+configuration will be explained in detail in the following sections.
+
+### Setting Configuration Flags
+
+You should set the configuration flags before you create the dock manager
+instance. That means, setting the configurations flags is the first thing
+you do, if you use the library.
+
+```c++
+CDockManager::setConfigFlags(CDockManager::DefaultOpaqueConfig);
+CDockManager::setConfigFlag(CDockManager::RetainTabSizeWhenCloseButtonHidden, true);
+...
+d->DockManager = new CDockManager(this);
+```
+
+If you set the configurations flags, you can set individual flags using the
+function `CDockManager::setConfigFlag` or you can set all flags using
+the function `CDockManager::setConfigFlags`. Instead of settings all
+flags individualy, it is better to pick a predefined set of configuration
+flags and then modify individual flags. The following predefined
+configurations are avilable
+
+- `DefaultNonOpaqueConfig` - uses non opaque splitter resizing and non opaque docking
+- `DefaultOpaqueConfig` - uses opaque splitter resizing and opaque docking
+
+Pick one of those predefined configurations and then modify the following
+configurations flags to adjust the docking system to your needs.
+
+### `ActiveTabHasCloseButton`
+
+If this flag is set (default configuration), the active tab in a tab area has
+a close button.
+
+![ActiveTabHasCloseButton true](cfg_flag_ActiveTabHasCloseButton_true.png)
+
+If this flag is cleared, the active tab has no close button. You can combine
+this with the flag `DockAreaCloseButtonClosesTab` to use the close button
+of the dock are to close the single tabs.
+
+![ActiveTabHasCloseButton true](cfg_flag_ActiveTabHasCloseButton_false.png)
+
+### `DockAreaHasCloseButton`
+
+If the flag is set (default configuration) each dock area has a close button.
+
+![DockAreaHasCloseButton true](cfg_flag_DockAreaHasCloseButton_true.png)
+
+If this flag is cleared, dock areas do not have a close button.
+
+![DockAreaHasCloseButton true](cfg_flag_DockAreaHasCloseButton_false.png)
+
+### `DockAreaCloseButtonClosesTab`
+
+If the flag is set, the dock area close button closes the active tab,
+if not set, it closes the complete dock area (default).
+
+### `OpaqueSplitterResize`
+
+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. This global dock manager flag configures the resizing behaviour of the splitters. If this flag is set, then widgets are resized dynamically (opaquely) while interactively moving the splitters. If you select the predefined configuration `DefaultOpaqueConfig`, then this is the configured behaviour.
+
+![Opaque resizing](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. If you select the predefined
+configuration `DefaultNonOpaqueConfig`, then this is the configured behaviour.
+
+![Non-opaque resizing](non_opaque_resizing.gif)
+
+### `XmlAutoFormattingEnabled`
+
+If enabled, the XML writer automatically adds line-breaks and indentation to
+empty sections between elements (ignorable whitespace). This is used, when
+the current state or perspective is saved. It is disabled by default.
+
+### `XmlCompressionEnabled`
+
+If enabled, the XML output will be compressed and is not human readable anymore.
+This ie enabled by default to minimize the size of the saved data.
+
+### `TabCloseButtonIsToolButton`
+
+If enabled the tab close buttons will be `QToolButtons` instead of `QPushButtons` - 
+disabled by default. Normally the default configuration should be ok but if your
+application requires `QToolButtons` instead of `QPushButtons` for styling reasons
+or for any other reasons, then you can enable this flag.
+
+### `AllTabsHaveCloseButton`
+
+If this flag is set, then all tabs that are closable show a close button. The
+advantage of this setting is that the size of the tabs does not change and the
+user can immediately close each tab. The disadvantage is that all tabs take up
+more space.
+
+![AllTabsHaveCloseButton true](cfg_flag_AllTabsHaveCloseButton_true.png)
+
+If this flas is cleared, then only the active tab has a close button (default)
+and therefore the tabs need less space.
+
+![AllTabsHaveCloseButton false](cfg_flag_ActiveTabHasCloseButton_true.png)
+
+### `RetainTabSizeWhenCloseButtonHidden`
+
+If this flag is set, the space for the close button is reserved even if the
+close button is not visible. This flag is disabled by default. If this flag
+is disabled, the tab size dynamically changes if the close button is
+visible / hidden in a tab. If this flag is enabled, the tab size always remains
+constant, that means, if enabled, the tabs need more space.
+
+![AllTabsHaveCloseButton false](cfg_flag_RetainTabSizeWhenCloseButtonHidden_true.png)
+
+### `OpaqueUndocking`
+
+If this flag is set, 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.
+
+![OpaqueUndocking true](opaque_undocking.gif)
+
+If you would like to test opaque undocking, you should set the pedefined config
+flags `CDockManager::DefaultOpaqueConfig`.
+
+```c++
+CDockManager::setConfigFlags(CDockManager::DefaultOpaqueConfig);
+```
+
+If this flag is cleared (default), 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.
+
+![OpaqueUndocking true](non_opaque_undocking.gif)
+
+The drag preview widget can be configured by a number of global dock manager flags:
+
+- `DragPreviewIsDynamic`
+- `DragPreviewShowsContentPixmap`
+- `DragPreviewHasWindowFrame`
+
+Non-opaque undocking is enabled by default. If you would like to enable it
+explicitely, you can do this by setting the predefined configuration flags
+`CDockManager::DefaultNonOpaqueConfig`.
+
+```c++
+CDockManager::setConfigFlags(CDockManager::DefaultNonOpaqueConfig);
+```
+
+### `DragPreviewIsDynamic`
+
+If non-opaque undocking is enabled, this flag defines the behavior of the drag 
+preview window. If this flag is enabled, then it will give the user the
+impression, that the floating drag preview is dynamically adjusted to the drop
+area. In order to give the perfect impression, you should disable the flags
+`DragPreviewShowsContentPixmap` and `DragPreviewHasWindowFrame`.
+
+```c++
+CDockManager::setConfigFlag(CDockManager::DragPreviewIsDynamic, true);
+CDockManager::setConfigFlag(CDockManager::DragPreviewShowsContentPixmap, false);
+CDockManager::setConfigFlag(CDockManager::DragPreviewHasWindowFrame, false);
+```
+
+![DragPreviewIsDynamic true](dynamic_drag_preview.gif)
+
+### `DragPreviewShowsContentPixmap`
+
+If non-opaque undocking is enabled, the created drag preview window shows a 
+copy of the content of the dock widget / dock are that is dragged, if this
+flag is enabled (default).
+
+![DragPreviewShowsContentPixmap true](cfg_flag_DragPreviewShowsContentPixmap_true.png)
+
+If this flag is disabled, the drag preview is only a transparent `QRubberBand`
+like window without any content.
+
+![DragPreviewShowsContentPixmap true](cfg_flag_DragPreviewShowsContentPixmap_false.png)
+
+### `DragPreviewHasWindowFrame`
+
+If non-opaque undocking is enabled, then this flag configures if the drag 
+preview is frameless (default) or looks like a real window. If it is enabled,
+then the drag preview is a transparent window with a system window frame.
+
+![DragPreviewHasWindowFrame true](cfg_flag_DragPreviewHasWindowFrame_true.png)
+
+### `AlwaysShowTabs`
+
+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. In the image below
+on the left side, the flag is disabled (default) and on the right side it is
+enabled.
+
+![AlwaysShowTabs false true](cfg_flag_AlwaysShowTabs_false_true.png)
+
+### `DockAreaHasUndockButton`
+
+If the flag is set (default) each dock area has an undock button (right
+image). If the flag is cleared, a dock area has no undock button (left image)
+
+![DockAreaHasUndockButton false true](cfg_flag_DockAreaHasUndockButton_false_true.png)
+
+### `DockAreaHasTabsMenuButton`
+
+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. This flag shows / hides the tabs menu button
+in the dock area title bar. On the left side, the tabs menu button flag
+is cleared.
+
+![DockAreaHasTabsMenuButton false true](cfg_flag_DockAreaHasTabsMenuButton_false_true.png)
+
+### `DockAreaHideDisabledButtons`
+
+If certain flags of a dock widget are disabled, like `DockWidgetClosable` or
+`DockWidgetFloatable`, then the corresponding dock area buttons like close
+button or detach button are disabled (greyed out). This is the default
+setting.
+
+![DockAreaHideDisabledButtons false](cfg_flag_DockAreaHideDisabledButtons_false.png)
+
+If the flag is set, disabled dock area buttons will not appear on the toolbar at
+all - they are hidden.
+
+![DockAreaHideDisabledButtons true](cfg_flag_DockAreaHideDisabledButtons_true.png)
+
+### `DockAreaDynamicTabsMenuButtonVisibility`
+
+If this flag is cleared, the the tabs menu button is always visible. This is
+the default setting. If the flag is set, the tabs menu button will be shown
+only when it is required - that means, if the tabs are elided.
+
+![DockAreaDynamicTabsMenuButtonVisibility false](cfg_flag_DockAreaDynamicTabsMenuButtonVisibility_true_visible.png)
+
+If the tabs are not elided, the tabs menu button is hidden.
+
+![DockAreaDynamicTabsMenuButtonVisibility false](cfg_flag_DockAreaDynamicTabsMenuButtonVisibility_true_hidden.png)
+
+### `FloatingContainerHasWidgetTitle`
+
+If set (default), the floating widget window title reflects the title of the
+current dock widget.
+
+![FloatingContainerHasWidgetTitle true](cfg_flag_FloatingContainerHasWidgetTitle_true.png)
+
+otherwise it displays application name as window title.
+
+![FloatingContainerHasWidgetTitle false](cfg_flag_FloatingContainerHasWidgetTitle_false.png)
+
+### `FloatingContainerHasWidgetIcon`
+
+If set, the floating widget icon reflects the icon of the current dock widget
+
+![FloatingContainerHasWidgetIcon true](cfg_flag_FloatingContainerHasWidgetIcon_true.png)
+
+otherwise (default setting) it displays application icon.
+
+![FloatingContainerHasWidgetIcon false](cfg_flag_FloatingContainerHasWidgetIcon_false.png)
+
+### `HideSingleCentralWidgetTitleBar`
+
+If there is only one single visible dock widget in the main dock container (the dock manager) and if this flag is set, then the titlebar of this dock widget will be hidden.
+This only makes sense for non draggable and non floatable dock widgets and enables
+the creation of some kind of "central" static widget. Because the titlebar is
+hidden, it is not possible to drag out the central widget to make it floating
+or to close it via the close button.
+
+![HideSingleCentralWidgetTitleBar true](cfg_flag_HideSingleCentralWidgetTitleBar_true.png)
+
+The Advanced Docking System is meant for applications without a static central
+widget and normally does not know anything about a central static widget.
+Therefore this flag is disabled by default and a central single dock widget
+still has a titlebar to drag it out of the main window.
+
+![HideSingleCentralWidgetTitleBar false](cfg_flag_HideSingleCentralWidgetTitleBar_false.png)
+

sip/DockManager.sip

@@ -170,6 +170,7 @@ public:
         DefaultOpaqueConfig,
 		DefaultNonOpaqueConfig,
 		NonOpaqueWithWindowFrame,
+		HideSingleCentralWidgetTitleBar,
 	};
     typedef QFlags<ads::CDockManager::eConfigFlag> ConfigFlags;
 

sip/DockWidget.sip

@@ -50,6 +50,12 @@ public:
 		ForceScrollArea,
 		ForceNoScrollArea
 	};
+	
+    enum eMinimumSizeHintMode
+    {
+    	MinimumSizeHintFromDockWidget,
+    	MinimumSizeHintFromContent
+    };
 
 	enum eToggleViewActionMode
 	{
@@ -76,6 +82,7 @@ public:
 	bool isClosed() const;
 	QAction* toggleViewAction() const;
 	void setToggleViewActionMode(ads::CDockWidget::eToggleViewActionMode Mode);
+	void setMinimumSizeHintMode(ads::CDockWidget::eMinimumSizeHintMode Mode);
 	void setIcon(const QIcon& Icon);
 	QIcon icon() const;
 	QToolBar* toolBar() const;
@@ -89,15 +96,22 @@ public:
     virtual QList<QAction*> titleBarActions() const;
 
 	void setTabToolTip(const QString &text);
+    bool isFullScreen() const;
+    bool isTabbed() const;
+    bool isCurrentTab() const;
 
 public:
 	virtual bool event(QEvent *e);
 
 public slots:
 	void toggleView(bool Open = true);
+	void setAsCurrentTab();
+	void raise();
     void setFloating();
     void deleteDockWidget();
     void closeDockWidget();
+    void showFullScreen();
+    void showNormal();
 
 signals:
 	void viewToggled(bool Open);

src/DockAreaWidget.cpp

@@ -247,6 +247,7 @@ struct DockAreaWidgetPrivate
 	CDockManager*		DockManager		= nullptr;
 	bool UpdateTitleBarButtons = false;
 	DockWidgetAreas		AllowedAreas	= AllDockAreas;
+	QSize MinSizeHint;
 
 	/**
 	 * Private data constructor
@@ -303,6 +304,20 @@ struct DockAreaWidgetPrivate
 	 * Udpates the enable state of the close and detach button
 	 */
 	void updateTitleBarButtonStates();
+
+	/**
+	 * Scans all contained dock widgets for the max. minimum size hint
+	 */
+	void updateMinimumSizeHint()
+	{
+		MinSizeHint = QSize();
+		for (int i = 0; i < ContentsLayout->count(); ++i)
+		{
+			auto Widget = ContentsLayout->widget(i);
+			MinSizeHint.setHeight(qMax(MinSizeHint.height(), Widget->minimumSizeHint().height()));
+			MinSizeHint.setWidth(qMax(MinSizeHint.width(), Widget->minimumSizeHint().width()));
+		}
+	}
 };
 // struct DockAreaWidgetPrivate
 
@@ -407,6 +422,8 @@ void CDockAreaWidget::insertDockWidget(int index, CDockWidget* DockWidget,
 	d->tabBar()->blockSignals(false);
 	TabWidget->setVisible(!DockWidget->isClosed());
 	DockWidget->setProperty(INDEX_PROPERTY, index);
+	d->MinSizeHint.setHeight(qMax(d->MinSizeHint.height(), DockWidget->minimumSizeHint().height()));
+	d->MinSizeHint.setWidth(qMax(d->MinSizeHint.width(), DockWidget->minimumSizeHint().width()));
 	if (Activate)
 	{
 		setCurrentIndex(index);
@@ -447,6 +464,7 @@ void CDockAreaWidget::removeDockWidget(CDockWidget* DockWidget)
 
 	d->updateTitleBarButtonStates();
 	updateTitleBarVisibility();
+	d->updateMinimumSizeHint();
 	auto TopLevelDockWidget = DockContainer->topLevelDockWidget();
 	if (TopLevelDockWidget)
 	{
@@ -470,7 +488,7 @@ void CDockAreaWidget::hideAreaWithNoVisibleContent()
 
 	//Hide empty floating widget
 	CDockContainerWidget* Container = this->dockContainer();
-	if (!Container->isFloating())
+	if (!Container->isFloating() && !CDockManager::testConfigFlag(CDockManager::HideSingleCentralWidgetTitleBar))
 	{
 		return;
 	}
@@ -480,10 +498,13 @@ void CDockAreaWidget::hideAreaWithNoVisibleContent()
 	auto FloatingWidget = Container->floatingWidget();
 	if (TopLevelWidget)
 	{
-		FloatingWidget->updateWindowTitle();
+		if (FloatingWidget)
+		{
+			FloatingWidget->updateWindowTitle();
+		}
 		CDockWidget::emitTopLevelEventForWidget(TopLevelWidget, true);
 	}
-	else if (Container->openedDockAreas().isEmpty())
+	else if (Container->openedDockAreas().isEmpty() && FloatingWidget)
 	{
 		FloatingWidget->hide();
 	}
@@ -711,7 +732,9 @@ void CDockAreaWidget::updateTitleBarVisibility()
 
 	if (d->TitleBar)
 	{
-		d->TitleBar->setVisible(!Container->isFloating() || !Container->hasTopLevelDockWidget());
+		bool Hidden = Container->hasTopLevelDockWidget() && (Container->isFloating()
+			|| CDockManager::configFlags().testFlag(CDockManager::HideSingleCentralWidgetTitleBar));
+		d->TitleBar->setVisible(!Hidden);
 	}
 }
 
@@ -863,6 +886,13 @@ CDockAreaTitleBar* CDockAreaWidget::titleBar() const
 {
 	return d->TitleBar;
 }
+
+
+//============================================================================
+QSize CDockAreaWidget::minimumSizeHint() const
+{
+	return d->MinSizeHint.isValid() ? d->MinSizeHint : Super::minimumSizeHint();
+}
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockAreaWidget.h

@@ -164,6 +164,13 @@ public:
 	 */
 	CDockContainerWidget* dockContainer() const;
 
+    /**
+     * Returns the largest minimumSizeHint() of the dock widgets in this
+     * area.
+     * The minimum size hint is updated if a dock widget is removed or added.
+     */
+    virtual QSize minimumSizeHint() const override;
+
 	/**
 	 * Returns the rectangle of the title area
 	 */

src/DockContainerWidget.cpp

@@ -1614,11 +1614,6 @@ CDockAreaWidget* CDockContainerWidget::lastAddedDockAreaWidget(DockWidgetArea ar
 //============================================================================
 bool CDockContainerWidget::hasTopLevelDockWidget() const
 {
-	if (!isFloating())
-	{
-		return false;
-	}
-
 	auto DockAreas = openedDockAreas();
 	if (DockAreas.count() != 1)
 	{
@@ -1652,11 +1647,6 @@ CDockWidget* CDockContainerWidget::topLevelDockWidget() const
 //============================================================================
 CDockAreaWidget* CDockContainerWidget::topLevelDockArea() const
 {
-	if (!isFloating())
-	{
-		return nullptr;
-	}
-
 	auto DockAreas = openedDockAreas();
 	if (DockAreas.count() != 1)
 	{

src/DockContainerWidget.h

@@ -55,8 +55,8 @@ class CDockingStateReader;
  * Container that manages a number of dock areas with single dock widgets
  * or tabyfied dock widgets in each area.
  * Each window that support docking has a DockContainerWidget. That means
- * the main application window and all floating windows are ore contain
- * an DockContainerWidget.
+ * the main application window and all floating windows contain a 
+ * DockContainerWidget instance.
  */
 class ADS_EXPORT CDockContainerWidget : public QFrame
 {

src/DockManager.cpp

@@ -55,6 +55,20 @@
 #include "DockingStateReader.h"
 
 
+/**
+ * Initializes the resources specified by the .qrc file with the specified base
+ * name. Normally, when resources are built as part of the application, the
+ * resources are loaded automatically at startup. The Q_INIT_RESOURCE() macro
+ * is necessary on some platforms for resources stored in a static library.
+ * Because GCC caues a linker error if we put Q_INIT_RESOURCE into the
+ * loadStyleSheet() function, we place it into a function outside of the ads
+ * namespace
+ */
+static void initResource()
+{
+	Q_INIT_RESOURCE(ads);
+}
+
 
 namespace ads
 {
@@ -148,6 +162,7 @@ DockManagerPrivate::DockManagerPrivate(CDockManager* _public) :
 //============================================================================
 void DockManagerPrivate::loadStylesheet()
 {
+	initResource();
 	QString Result;
 #ifdef Q_OS_LINUX
     QFile StyleSheetFile(":ads/stylesheets/default_linux.css");

src/DockManager.h

@@ -30,18 +30,11 @@
 //============================================================================
 //                                   INCLUDES
 //============================================================================
-#include <ads_globals.h>
-#include <DockContainerWidget.h>
-#include <DockWidget.h>
-#include <FloatingDockContainer.h>
-#include <qbytearray.h>
-#include <qflags.h>
-#include <qlist.h>
-#include <qmap.h>
-#include <qobjectdefs.h>
-#include <qstring.h>
-#include <qstringlist.h>
-#include <QtGui/qicon.h>
+#include "ads_globals.h"
+#include "DockContainerWidget.h"
+#include "DockWidget.h"
+#include "FloatingDockContainer.h"
+
 
 class QSettings;
 class QMenu;
@@ -162,10 +155,12 @@ public:
 		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,
+		DockAreaHideDisabledButtons = 0x10000,    //!< If the flag is set disabled dock area buttons will not appear on the toolbar at all (enabling them will bring them back)
+		DockAreaDynamicTabsMenuButtonVisibility = 0x20000, //!< If the flag is set, the tabs menu button will be shown only when it is required - that means, if the tabs are elided. If the tabs are not elided, it is hidden
+		FloatingContainerHasWidgetTitle = 0x40000, //!< If set, the Floating Widget window title reflects the title of the current dock widget otherwise it displays application name as window title
+		FloatingContainerHasWidgetIcon = 0x80000, //!< If set, the Floating Widget icon reflects the icon of the current dock widget otherwise it displays application icon
+		HideSingleCentralWidgetTitleBar = 0x100000, //!< If there is only one single visible dock widget in the main dock container (the dock manager) and if this flag is set, then the titlebar of this dock widget will be hidden
+		                                            //!< this only makes sense for non draggable and non floatable widgets and enables the creation of some kind of "central" widget
 
 
         DefaultDockAreaButtons = DockAreaHasCloseButton

src/DockOverlay.cpp

@@ -37,6 +37,7 @@
 #include <QWindow>
 
 #include "DockAreaWidget.h"
+#include "DockAreaTitleBar.h"
 
 #include <iostream>
 
@@ -387,6 +388,7 @@ DockWidgetArea CDockOverlay::dropAreaUnderCursor() const
 	}
 
 	if (DockArea->allowedAreas().testFlag(CenterDockWidgetArea)
+	 && !DockArea->titleBar()->isHidden()
 	 && DockArea->titleBarGeometry().contains(DockArea->mapFromGlobal(QCursor::pos())))
 	{
 		return CenterDockWidgetArea;

src/DockWidget.cpp

@@ -44,6 +44,7 @@
 #include <QDebug>
 #include <QToolBar>
 #include <QXmlStreamWriter>
+#include <QWindow>
 
 #include <QGuiApplication>
 #include <QScreen>
@@ -82,6 +83,7 @@ struct DockWidgetPrivate
 	QSize ToolBarIconSizeFloating = QSize(24, 24);
 	bool IsFloatingTopLevel = false;
 	QList<QAction*> TitleBarActions;
+	CDockWidget::eMinimumSizeHintMode MinimumSizeHintMode = CDockWidget::MinimumSizeHintFromDockWidget;
 
 	/**
 	 * Private data constructor
@@ -256,7 +258,12 @@ void CDockWidget::setToggleViewActionChecked(bool Checked)
 //============================================================================
 void CDockWidget::setWidget(QWidget* widget, eInsertMode InsertMode)
 {
-	QScrollArea* ScrollAreaWidget = qobject_cast<QScrollArea*>(widget);
+	if (d->Widget)
+	{
+		takeWidget();
+	}
+
+	auto ScrollAreaWidget = qobject_cast<QAbstractScrollArea*>(widget);
 	if (ScrollAreaWidget || ForceNoScrollArea == InsertMode)
 	{
 		d->Layout->addWidget(widget);
@@ -279,10 +286,26 @@ void CDockWidget::setWidget(QWidget* widget, eInsertMode InsertMode)
 //============================================================================
 QWidget* CDockWidget::takeWidget()
 {
-	d->ScrollArea->takeWidget();
-	d->Layout->removeWidget(d->Widget);
-	d->Widget->setParent(nullptr);
-    return d->Widget;
+	QWidget* w = nullptr;
+	if (d->ScrollArea)
+	{
+		d->Layout->removeWidget(d->ScrollArea);
+		w = d->ScrollArea->takeWidget();
+		delete d->ScrollArea;
+		d->ScrollArea = nullptr;
+	}
+	else if (d->Widget)
+	{
+		d->Layout->removeWidget(d->Widget);
+		w = d->Widget;
+		d->Widget = nullptr;
+	}
+
+	if (w)
+	{
+		w->setParent(nullptr);
+	}
+    return w;
 }
 
 
@@ -424,6 +447,13 @@ void CDockWidget::setToggleViewActionMode(eToggleViewActionMode Mode)
 }
 
 
+//============================================================================
+void CDockWidget::setMinimumSizeHintMode(eMinimumSizeHintMode Mode)
+{
+	d->MinimumSizeHintMode = Mode;
+}
+
+
 //============================================================================
 void CDockWidget::toggleView(bool Open)
 {
@@ -753,7 +783,14 @@ void CDockWidget::setClosedState(bool Closed)
 //============================================================================
 QSize CDockWidget::minimumSizeHint() const
 {
-	return QSize(60, 40);
+	if (d->MinimumSizeHintMode == CDockWidget::MinimumSizeHintFromDockWidget || !d->Widget)
+	{
+		return QSize(60, 40);
+	}
+	else
+	{
+		return d->Widget->minimumSizeHint();
+	}
 }
 
 
@@ -840,6 +877,91 @@ QList<QAction*> CDockWidget::titleBarActions() const
 }
 
 
+//============================================================================
+void CDockWidget::showFullScreen()
+{
+	if (isFloating())
+	{
+		dockContainer()->floatingWidget()->showFullScreen();
+	}
+	else
+	{
+		Super::showFullScreen();
+	}
+}
+
+
+//============================================================================
+void CDockWidget::showNormal()
+{
+	if (isFloating())
+	{
+		dockContainer()->floatingWidget()->showNormal();
+	}
+	else
+	{
+		Super::showNormal();
+	}
+}
+
+
+//============================================================================
+bool CDockWidget::isFullScreen() const
+{
+	if (isFloating())
+	{
+		return dockContainer()->floatingWidget()->isFullScreen();
+	}
+	else
+	{
+		return Super::isFullScreen();
+	}
+}
+
+
+//============================================================================
+void CDockWidget::setAsCurrentTab()
+{
+	if (d->DockArea && !isClosed())
+	{
+		d->DockArea->setCurrentDockWidget(this);
+	}
+}
+
+
+//============================================================================
+bool CDockWidget::isTabbed() const
+{
+	return d->DockArea && (d->DockArea->openDockWidgetsCount() > 1);
+}
+
+
+
+//============================================================================
+bool CDockWidget::isCurrentTab() const
+{
+	return d->DockArea && (d->DockArea->currentDockWidget() == this);
+}
+
+
+//============================================================================
+void CDockWidget::raise()
+{
+	if (isClosed())
+	{
+		return;
+	}
+
+	setAsCurrentTab();
+	if (isInFloatingContainer())
+	{
+		auto FloatingWindow = window();
+		FloatingWindow->raise();
+		FloatingWindow->activateWindow();
+	}
+}
+
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockWidget.h

@@ -147,8 +147,8 @@ public:
 
     enum DockWidgetFeature
     {
-        DockWidgetClosable = 0x01,
-        DockWidgetMovable = 0x02,///< this feature is not properly implemented yet and is ignored
+        DockWidgetClosable = 0x01,///< dock widget has a close button
+        DockWidgetMovable = 0x02,///< dock widget is movable and can be moved to a new position in the current dock container
         DockWidgetFloatable = 0x04,
         DockWidgetDeleteOnClose = 0x08, ///< deletes the dock widget when it is closed
         CustomCloseHandling = 0x10,
@@ -189,6 +189,23 @@ public:
         ForceNoScrollArea
     };
 
+
+    /**
+     * The mode of the minimumSizeHint() that is returned by the DockWidget
+     * minimumSizeHint() function.
+     * To ensure, that a dock widget does not block resizing, the dock widget
+     * reimplements minimumSizeHint() function to return a very small minimum
+     * size hint. If you would like to adhere the minimumSizeHint() from the
+     * content widget, the set the minimumSizeHintMode() to
+     * MinimumSizeHintFromContent.
+     */
+    enum eMinimumSizeHintMode
+    {
+    	MinimumSizeHintFromDockWidget,
+    	MinimumSizeHintFromContent
+    };
+
+
     /**
      * This mode configures the behavior of the toggle view action.
      * If the mode if ActionModeToggle, then the toggle view action is
@@ -225,7 +242,8 @@ public:
     virtual ~CDockWidget();
 
     /**
-     * We return a fixed minimum size hint for all dock widgets
+     * We return a fixed minimum size hint or the size hint of the content
+     * widget if minimum size hint mode is MinimumSizeHintFromContent
      */
     virtual QSize minimumSizeHint() const override;
 
@@ -334,6 +352,13 @@ public:
      */
     void setToggleViewActionMode(eToggleViewActionMode Mode);
 
+    /**
+     * Configures the minimum size hint that is returned by the
+     * minimumSizeHint() function.
+     * \see eMinimumSizeHintMode for a detailed description
+     */
+    void setMinimumSizeHintMode(eMinimumSizeHintMode Mode);
+
     /**
      * Sets the dock widget icon that is shown in tabs and in toggle view
      * actions
@@ -424,6 +449,26 @@ public:
     void setTabToolTip(const QString &text);
 #endif
 
+    /**
+     * Returns true if the dock widget is floating and if the floating dock
+     * container is full screen
+     */
+    bool isFullScreen() const;
+
+    /**
+     * Returns true if this dock widget is in a dock area, that contains at
+     * least 2 opened dock widgets
+     */
+    bool isTabbed() const;
+
+    /**
+     * Returns true if this dock widget is the current one in the dock
+     * area widget that contains it.
+     * If the dock widget is the only opened dock widget in a dock area,
+     * the true is returned
+     */
+    bool isCurrentTab() const;
+
 public: // reimplements QFrame -----------------------------------------------
     /**
      * Emits titleChanged signal if title change event occurs
@@ -437,6 +482,23 @@ public slots:
      */
     void toggleView(bool Open = true);
 
+    /**
+     * Makes this dock widget the current tab in its dock area.
+     * The function only has an effect, if the dock widget is open. A call
+     * to this function will not toggle the view, so if it is closed,
+     * nothing will happen
+     */
+    void setAsCurrentTab();
+
+    /**
+     * Brings the dock widget to the front
+     * This means:
+     * 	- If the dock widget is tabbed with other dock widgets but its tab is not current, it's made current.
+     * 	- If the dock widget is floating, QWindow::raise() is called.
+     * 	This only applies if the dock widget is already open. If closed, does nothing.
+     */
+    void raise();
+
     /**
      * This function will make a docked widget floating
      */
@@ -453,6 +515,26 @@ public slots:
      */
     void closeDockWidget();
 
+    /**
+     * Shows the widget in full-screen mode.
+     * Normally this function only affects windows. To make the interface
+     * compatible to QDockWidget, this function also maximizes a floating
+     * dock widget.
+     *
+     * \note Full-screen mode works fine under Windows, but has certain
+     * problems (doe not work) under X (Linux). These problems are due to
+     * limitations of the ICCCM protocol that specifies the communication
+     * between X11 clients and the window manager. ICCCM simply does not
+     * understand the concept of non-decorated full-screen windows.
+     */
+    void showFullScreen();
+
+    /**
+     * This function complements showFullScreen() to restore the widget
+     * after it has been in full screen mode.
+     */
+    void showNormal();
+
 
 signals:
     /**

src/DockWidgetTab.cpp

@@ -241,7 +241,6 @@ bool DockWidgetTabPrivate::startFloating(eDragState DraggingState)
 
     ADS_PRINT("startFloating");
 	DragState = DraggingState;
-	QSize Size = DockArea->size();
 	IFloatingWidget* FloatingWidget = nullptr;
 	bool OpaqueUndocking = CDockManager::configFlags().testFlag(CDockManager::OpaqueUndocking) ||
 		(DraggingFloatingWidget != DraggingState);
@@ -249,13 +248,16 @@ bool DockWidgetTabPrivate::startFloating(eDragState DraggingState)
 	// If section widget has multiple tabs, we take only one tab
 	// If it has only one single tab, we can move the complete
 	// dock area into floating widget
+	QSize Size;
 	if (DockArea->dockWidgetsCount() > 1)
 	{
 		FloatingWidget = createFloatingWidget(DockWidget, OpaqueUndocking);
+		Size = DockWidget->size();
 	}
 	else
 	{
 		FloatingWidget = createFloatingWidget(DockArea, OpaqueUndocking);
+		Size = DockArea->size();
 	}
 
     if (DraggingFloatingWidget == DraggingState)
@@ -578,6 +580,8 @@ void CDockWidgetTab::setText(const QString& title)
 	d->TitleLabel->setText(title);
 }
 
+
+//============================================================================
 bool CDockWidgetTab::isTitleElided() const
 {
 	return d->TitleLabel->isElided();
@@ -630,6 +634,13 @@ void CDockWidgetTab::onDockWidgetFeaturesChanged()
 }
 
 
+//============================================================================
+void CDockWidgetTab::setElideMode(Qt::TextElideMode mode)
+{
+	d->TitleLabel->setElideMode(mode);
+}
+
+
 
 
 } // namespace ads

src/DockWidgetTab.h

@@ -147,6 +147,11 @@ public:
 	*/
 	virtual bool event(QEvent *e) override;
 
+	/**
+	 * Sets the text elide mode
+	 */
+	void setElideMode(Qt::TextElideMode mode);
+
 
 public slots:
 	virtual void setVisible(bool visible) override;

src/ElidingLabel.cpp

@@ -197,13 +197,13 @@ QSize CElidingLabel::sizeHint() const
 //============================================================================
 void CElidingLabel::setText(const QString &text)
 {
+	d->Text = text;
 	if (d->isModeElideNone())
 	{
 		Super::setText(text);
 	}
 	else
 	{
-		d->Text = text;
 		internal::setToolTip(this, text);
 		d->elideText(this->size().width());
 	}

src/FloatingDockContainer.cpp

@@ -38,6 +38,7 @@
 #include <QDebug>
 #include <QAbstractButton>
 #include <QElapsedTimer>
+#include <QTime>
 
 #include "DockContainerWidget.h"
 #include "DockAreaWidget.h"
@@ -66,6 +67,7 @@ struct FloatingDockContainerPrivate
 	QPoint DragStartMousePosition;
 	CDockContainerWidget *DropContainer = nullptr;
 	CDockAreaWidget *SingleDockArea = nullptr;
+	QPoint DragStartPos;
 #ifdef Q_OS_LINUX
     QWidget* MouseEventHandler = nullptr;
     CFloatingWidgetTitleBar* TitleBar = nullptr;
@@ -109,6 +111,10 @@ struct FloatingDockContainerPrivate
 #endif
 	}
 
+	/**
+	 * Reflect the current dock widget title in the floating widget windowTitle()
+	 * depending on the CDockManager::FloatingContainerHasWidgetTitle flag
+	 */
 	void reflectCurrentWidget(CDockWidget* CurrentWidget)
 	{
 		// reflect CurrentWidget's title if configured to do so, otherwise display application name as window title
@@ -133,6 +139,11 @@ struct FloatingDockContainerPrivate
 			_this->setWindowIcon(QApplication::windowIcon());
 		}
 	}
+
+	/**
+	 * Handles escape key press when dragging around the floating widget
+	 */
+	void handleEscapeKey();
 };
 // struct FloatingDockContainerPrivate
 
@@ -158,14 +169,14 @@ void FloatingDockContainerPrivate::titleMouseReleaseEvent()
 	    || DockManager->containerOverlay()->dropAreaUnderCursor()
 	        != InvalidDockWidgetArea)
 	{
-		// Resize the floating widget to the size of the highlighted drop area
-		// rectangle
 		CDockOverlay *Overlay = DockManager->containerOverlay();
 		if (!Overlay->dropOverlayRect().isValid())
 		{
 			Overlay = DockManager->dockAreaOverlay();
 		}
 
+		// Resize the floating widget to the size of the highlighted drop area
+		// rectangle
 		QRect Rect = Overlay->dropOverlayRect();
 		int FrameWidth = (_this->frameSize().width() - _this->rect().width())
 		    / 2;
@@ -264,6 +275,17 @@ void FloatingDockContainerPrivate::updateDropOverlays(const QPoint &GlobalPos)
 	}
 }
 
+
+//============================================================================
+void FloatingDockContainerPrivate::handleEscapeKey()
+{
+	ADS_PRINT("FloatingDockContainerPrivate::handleEscapeKey()");
+	setState(DraggingInactive);
+	DockManager->containerOverlay()->hideOverlay();
+	DockManager->dockAreaOverlay()->hideOverlay();
+}
+
+
 //============================================================================
 CFloatingDockContainer::CFloatingDockContainer(CDockManager *DockManager) :
 	tFloatingWidgetBase(DockManager),
@@ -363,6 +385,9 @@ void CFloatingDockContainer::moveEvent(QMoveEvent *event)
 	switch (d->DraggingState)
 	{
 	case DraggingMousePressed:
+#ifdef Q_OS_WIN
+		qApp->installEventFilter(this);
+#endif
 		d->setState(DraggingFloatingWidget);
 		d->updateDropOverlays(QCursor::pos());
 		break;
@@ -380,6 +405,8 @@ void CFloatingDockContainer::moveEvent(QMoveEvent *event)
 	default:
 		break;
 	}
+
+
 }
 
 //============================================================================
@@ -443,6 +470,7 @@ void CFloatingDockContainer::showEvent(QShowEvent *event)
 	Super::showEvent(event);
 }
 
+
 //============================================================================
 bool CFloatingDockContainer::event(QEvent *e)
 {
@@ -458,21 +486,17 @@ bool CFloatingDockContainer::event(QEvent *e)
 		// It is really great to work around the whole NonClientMouseArea
 		// bugs
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 12, 2))
-		if (e->type()
-		    == QEvent::NonClientAreaMouseButtonPress /*&& QGuiApplication::mouseButtons().testFlag(Qt::LeftButton)*/)
-		{
-			ADS_PRINT("FloatingWidget::event Event::NonClientAreaMouseButtonPress" << e->type());
-			d->setState(DraggingMousePressed);
-		}
+		if (e->type() == QEvent::NonClientAreaMouseButtonPress /*&& QGuiApplication::mouseButtons().testFlag(Qt::LeftButton)*/)
 #else
 		if (e->type() == QEvent::NonClientAreaMouseButtonPress && QGuiApplication::mouseButtons().testFlag(Qt::LeftButton))
+#endif
 		{
-            ADS_PRINT("FloatingWidget::event Event::NonClientAreaMouseButtonPress" << e->type());
+			ADS_PRINT("FloatingWidget::event Event::NonClientAreaMouseButtonPress" << e->type());
+			d->DragStartPos = pos();
 			d->setState(DraggingMousePressed);
 		}
-#endif
 	}
-		break;
+	break;
 
 	case DraggingMousePressed:
 		switch (e->type())
@@ -515,12 +539,49 @@ bool CFloatingDockContainer::event(QEvent *e)
 	}
 
 #if (ADS_DEBUG_LEVEL > 0)
-	qDebug() << "CFloatingDockContainer::event " << e->type();
+	qDebug() << QTime::currentTime() << "CFloatingDockContainer::event " << e->type();
 #endif
 	return QWidget::event(e);
 }
 
 
+//============================================================================
+bool CFloatingDockContainer::eventFilter(QObject *watched, QEvent *e)
+{
+	Q_UNUSED(watched);
+	// I have not found a way to detect non client area key press events to
+	// handle escape key presses. On Windows, if the escape key is pressed while
+	// dragging around a widget, the widget position is reset to its start position
+	// which in turn generates a QEvent::NonClientAreaMouseButtonRelease event
+	// if the mouse is outside of the widget after the move to its initial position
+	// or a QEvent::MouseButtonRelease event, if the mouse is inside of teh widget
+	// after the position has been reset.
+	// So we can install an event filter on the application to get these events
+	// here to properly cancel dragging and hide the overlays.
+	// If we are in DraggingFloatingWidget state, it means the widget
+	// has been dragged already but if the position is the same like
+	// the start position, then this is an indication that the escape
+	// key has been pressed.
+	if (e->type() == QEvent::MouseButtonRelease || e->type() == QEvent::NonClientAreaMouseButtonRelease)
+	{
+		ADS_PRINT("CFloatingDockContainer::eventFilter QEvent::MouseButtonRelease or"
+			"QEvent::NonClientAreaMouseButtonRelease" << "d->DragggingState " << d->DraggingState);
+		qApp->removeEventFilter(this);
+		if (d->DragStartPos == pos())
+		{
+			d->handleEscapeKey();
+			return true;
+		}
+		return false;
+	}
+
+#if (ADS_DEBUG_LEVEL > 0)
+	qDebug() << QTime::currentTime() << "CFloatingDockContainer::eventFilter " << e->type();
+#endif
+	return false;
+}
+
+
 //============================================================================
 void CFloatingDockContainer::startFloating(const QPoint &DragStartMousePos,
     const QSize &Size, eDragState DragState, QWidget *MouseEventHandler)

src/FloatingDockContainer.h

@@ -68,6 +68,8 @@ class CDockingStateReader;
 class IFloatingWidget
 {
 public:
+    virtual ~IFloatingWidget() = default;
+
 	/**
 	 * Starts floating.
 	 * This function should get called typically from a mouse press event
@@ -180,6 +182,7 @@ protected: // reimplements QWidget
 	virtual void closeEvent(QCloseEvent *event) override;
 	virtual void hideEvent(QHideEvent *event) override;
 	virtual void showEvent(QShowEvent *event) override;
+	virtual bool eventFilter(QObject *watched, QEvent *event) override;
 
 public:
 	using Super = QWidget;

src/FloatingDragPreview.cpp

@@ -66,6 +66,12 @@ struct FloatingDragPreviewPrivate
 		DockManager->dockAreaOverlay()->hideOverlay();
 		_this->close();
 	}
+
+	/**
+	 * Creates the real floating widget in case the mouse is released outside
+	 * outside of any drop area
+	 */
+	void createFloatingWidget();
 };
 // struct LedArrayPanelPrivate
 
@@ -150,7 +156,7 @@ void FloatingDragPreviewPrivate::updateDropOverlays(const QPoint &GlobalPos)
 		// would be removed and inserted at the same position
 		if (VisibleDockAreas <= 1)
 		{
-			ContainerOverlay->hide();
+			ContainerOverlay->hideOverlay();
 		}
 
 		if (DockArea == ContentSourceArea && InvalidDockWidgetArea == ContainerDropArea)
@@ -173,6 +179,40 @@ FloatingDragPreviewPrivate::FloatingDragPreviewPrivate(CFloatingDragPreview *_pu
 
 }
 
+
+//============================================================================
+void FloatingDragPreviewPrivate::createFloatingWidget()
+{
+	CDockWidget* DockWidget = qobject_cast<CDockWidget*>(Content);
+	CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(Content);
+
+	CFloatingDockContainer* FloatingWidget = nullptr;
+
+	if (DockWidget && DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable))
+	{
+		FloatingWidget = new CFloatingDockContainer(DockWidget);
+	}
+	else if (DockArea && DockArea->features().testFlag(CDockWidget::DockWidgetFloatable))
+	{
+		FloatingWidget = new CFloatingDockContainer(DockArea);
+	}
+
+	if (FloatingWidget)
+	{
+		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);
+		}
+	}
+}
+
+
 //============================================================================
 CFloatingDragPreview::CFloatingDragPreview(QWidget* Content, QWidget* parent) :
 	QWidget(parent),
@@ -288,46 +328,31 @@ void CFloatingDragPreview::finishDragging()
 	ADS_PRINT("CFloatingDragPreview::finishDragging");
 	auto DockDropArea = d->DockManager->dockAreaOverlay()->visibleDropAreaUnderCursor();
 	auto ContainerDropArea = d->DockManager->containerOverlay()->visibleDropAreaUnderCursor();
-	if (d->DropContainer && (DockDropArea != InvalidDockWidgetArea))
+	if (!d->DropContainer)
+	{
+		d->createFloatingWidget();
+	}
+	else if (DockDropArea != InvalidDockWidgetArea)
 	{
 		d->DropContainer->dropWidget(d->Content, DockDropArea, d->DropContainer->dockAreaAt(QCursor::pos()));
 	}
-	else if (d->DropContainer && (ContainerDropArea != InvalidDockWidgetArea))
+	else if (ContainerDropArea != InvalidDockWidgetArea)
 	{
-		d->DropContainer->dropWidget(d->Content, ContainerDropArea, nullptr);
-	}
-	else
-	{
-		CDockWidget* DockWidget = qobject_cast<CDockWidget*>(d->Content);
-		CFloatingDockContainer* FloatingWidget = nullptr;
-
-		if (DockWidget && DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable))
+		// If there is only one single dock area, and we drop into the center
+		// then we tabify the dropped widget into the only visible dock area
+		if (d->DropContainer->visibleDockAreaCount() <= 1 && CenterDockWidgetArea == ContainerDropArea)
 		{
-			FloatingWidget = new CFloatingDockContainer(DockWidget);
+			d->DropContainer->dropWidget(d->Content, ContainerDropArea, d->DropContainer->dockAreaAt(QCursor::pos()));
 		}
 		else
 		{
-			CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(d->Content);
-			if (DockArea->features().testFlag(CDockWidget::DockWidgetFloatable))
-			{
-				FloatingWidget = new CFloatingDockContainer(DockArea);
-			}
-		}
-
-		if (FloatingWidget)
-		{
-			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);
-			}
+			d->DropContainer->dropWidget(d->Content, ContainerDropArea, nullptr);
 		}
 	}
+	else
+	{
+		d->createFloatingWidget();
+	}
 
 	this->close();
 	d->DockManager->containerOverlay()->hideOverlay();

src/ads_globals.h

@@ -66,7 +66,7 @@ namespace ads
 {
 enum eStateFileVersion
 {
-	InitialVerison = 0,
+	InitialVersion = 0,
 	Version1 = 1,
 	CurrentVersion = Version1
 };