Added documentation for FocusHighlighting flag

Improved styling of close buttons and focused close buttons

README.md

@@ -13,16 +13,6 @@ integrated development environments (IDEs) such as Visual Studio.
 
 [![Video Advanced Docking](doc/advanced-docking_video.png)](https://www.youtube.com/watch?v=7pdNfafg3Qc)
 
-Everything is implemented with standard Qt functionality without any
-platform specific code. Basic usage of QWidgets and QLayouts and using basic 
-styles as much as possible.
-
-This work is based on and inspired by the 
-[Advanced Docking System for Qt](https://github.com/mfreiholz/Qt-Advanced-Docking-System) 
-from Manuel Freiholz. I did an almost complete rewrite of his code to improve
-code quality, readibility and to fix all issues from the issue tracker 
-of his docking system project.
-
 ## Features
 
 ### Overview
@@ -38,6 +28,7 @@ of his docking system project.
   - [Tab-menu for easy handling of many tabbed dock widgets](#tab-menu-for-easy-handling-of-many-tabbed-dock-widgets)
   - [Many different ways to detach dock widgets](#many-different-ways-to-detach-dock-widgets)
   - [Supports deletion of dynamically created dock widgets](#supports-deletion-of-dynamically-created-dock-widgets)
+  - [Python PyQt5 Bindings](#python-pyqt5-bindings)
 - [Tested Compatible Environments](#tested-compatible-environments)
   - [Windows](#windows)
   - [macOS](#macos)
@@ -136,6 +127,20 @@ You can detach dock widgets and also dock areas in the following ways:
 
 Normally clicking the close button of a dock widget will just hide the widget and the user can show it again using the toggleView() action of the dock widget. This is meant for user interfaces with a static amount of widgets. But the advanced docking system also supports dynamic dock widgets that will get deleted on close. If you set the dock widget flag `DockWidgetDeleteOnClose` for a certain dock widget, then it will be deleted as soon as you close this dock widget. This enables the implementation of user interfaces with dynamically created editors, like in word processing applications or source code development tools.
 
+### Python PyQt5 Bindings
+
+<img src="doc/python_logo.png" height="140">
+
+The Advanced Docking System comes with a complete Python integration based on
+PyQt5 bindings. The package is available via [conda-forge](https://github.com/conda-forge/pyqtads-feedstock). The python integration has been contributed to this project
+by the following people:
+
+- [n-elie](https://github.com/n-elie)
+- [Hugo Slepicka](https://github.com/hhslepicka)
+- [K Lauer](https://github.com/klauer)
+
+Latest working version: [3.4.2](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/releases/tag/3.4.2)
+
 ## Tested Compatible Environments
 
 ### Windows
@@ -249,6 +254,12 @@ MainWindow::~MainWindow()
 - Uwe Kindler, Project Maintainer
 - Manuel Freiholz
 
+This work is based on and inspired by the 
+[Advanced Docking System for Qt](https://github.com/mfreiholz/Qt-Advanced-Docking-System)
+from Manuel Freiholz. I did an almost complete rewrite of his code to improve
+code quality, readibility and to fix all issues from the issue tracker
+of his docking system project.
+
 ## License information
 
 [![License: LGPL v2.1](https://img.shields.io/badge/License-LGPL%20v2.1-blue.svg)](gnu-lgpl-v2.1.md)

demo/MainWindow.cpp

@@ -196,6 +196,9 @@ static ads::CDockWidget* createFileSystemTreeDockWidget(QMenu* ViewMenu)
 		.arg(FileSystemCount++));
 	DockWidget->setWidget(w);
 	ViewMenu->addAction(DockWidget->toggleViewAction());
+	// We disable focus to test focus highlighting if the dock widget content
+	// does not support focus
+	w->setFocusPolicy(Qt::NoFocus);
     return DockWidget;
 }
 
@@ -571,6 +574,10 @@ CMainWindow::CMainWindow(QWidget *parent) :
 	// dock widget.
 	// CDockManager::setConfigFlag(CDockManager::HideSingleCentralWidgetTitleBar, true);
 
+	// uncomment the following line to enable focus highlighting of the dock
+	// widget that has the focus
+	// CDockManager::setConfigFlag(CDockManager::FocusHighlighting, true);
+
 	// Now create the dock manager and its content
 	d->DockManager = new CDockManager(this);
 
@@ -656,13 +663,14 @@ void CMainWindow::onViewToggled(bool Open)
 //============================================================================
 void CMainWindow::onViewVisibilityChanged(bool Visible)
 {
+	Q_UNUSED(Visible);
 	auto DockWidget = qobject_cast<ads::CDockWidget*>(sender());
     if (!DockWidget)
     {
         return;
     }
 
-    qDebug() << DockWidget->objectName() << " visibilityChanged(" << Visible << ")";
+    //qDebug() << DockWidget->objectName() << " visibilityChanged(" << Visible << ")";
 }
 
 

doc/user-guide.md

@@ -23,6 +23,7 @@
   - [`FloatingContainerHasWidgetTitle`](#floatingcontainerhaswidgettitle)
   - [`FloatingContainerHasWidgetIcon`](#floatingcontainerhaswidgeticon)
   - [`HideSingleCentralWidgetTitleBar`](#hidesinglecentralwidgettitlebar)
+  - [`FocusHighlighting`](#focushighlighting)
 - [Styling](#styling)
   - [Disabling the Internal Style Sheet](#disabling-the-internal-style-sheet)
 
@@ -284,7 +285,8 @@ otherwise (default setting) it displays application icon.
 
 ### `HideSingleCentralWidgetTitleBar`
 
-If there is only one single visible dock widget in the main dock container (the dock manager) and if this flag is set, then the titlebar of this dock widget will be hidden.
+If there is only one single visible dock widget in the main dock container (the dock manager)
+and if this flag is set, then the titlebar of this dock widget will be hidden.
 This only makes sense for non draggable and non floatable dock widgets and enables
 the creation of some kind of "central" static widget. Because the titlebar is
 hidden, it is not possible to drag out the central widget to make it floating
@@ -299,6 +301,114 @@ still has a titlebar to drag it out of the main window.
 
 ![HideSingleCentralWidgetTitleBar false](cfg_flag_HideSingleCentralWidgetTitleBar_false.png)
 
+### `FocusHighlighting`
+
+If this is enabled, the docking system is able to highlight the tab and the
+components of a dock area with a different style (i.e. a different color).
+This option is disabled by default and needs to be enabled explicitely
+because it adds some overhead. The dock manager needs to react on focus
+changes and dock widget dragging to highlight the right dock widget. You should
+enable it only, if you really need it for your application.
+
+If the feature is enabled, you can also connect to the new dock manager
+signal `focusedDockWidgetChanged(CDockWidget* old, CDockWidget* now)` to
+react on focus changes and to prepare the content of the focused dock
+widget.
+
+You can click into the tab, the titlebar or the content of a dock widget
+to focus it.
+
+![FocusHighlighting](cfg_flag_FocusHighlighting.gif)
+
+For the focused dock widget and dock widget tab, the property `focused` will
+be set to true and you can use this property to style the focused dock
+widget differently. The picture above uses the following styling:
+
+```css
+/* Color the tab with the nhighlight color */
+ads--CDockWidgetTab[focused="true"]
+{
+    background: palette(highlight);
+    border-color: palette(highlight);
+}
+
+/* Use a different colored close button icon to match the test color */
+ads--CDockWidgetTab[focused="true"] > #tabCloseButton
+{
+	qproperty-icon: url(:/ads/images/close-button-focused.svg)
+}
+
+/* Make a hovered focused close button a little bit lighter */
+ads--CDockWidgetTab[focused="true"] > #tabCloseButton:hover
+{
+	background: rgba(255, 255, 255, 48);
+}
+
+/* Make a pressed focused close button even more lighter */
+ads--CDockWidgetTab[focused="true"] > #tabCloseButton:pressed
+{
+	background: rgba(255, 255, 255, 92);
+}
+
+/* Use a different color for the tab label */
+ads--CDockWidgetTab[focused="true"] QLabel
+{
+    color: palette(light);
+}
+
+/* Paint a nice solid line for the whole title bar to create the illusion
+   of an active tab */
+ads--CDockAreaWidget[focused="true"] ads--CDockAreaTitleBar
+{
+	background: transparent;
+	border-bottom: 2px solid palette(highlight);
+	padding-bottom: 0px;
+}
+```
+
+If you have a content widget that does not support focussing for some reason
+(like `QVTKOpenGLStereoWidget` from the [VTK library](https://github.com/Kitware/VTK)),
+then you can manually switch the focus by reacting on mouse events. The 
+following code shows, how to install en event filter on the `QVTKOpenGLStereoWidget`
+to properly switch the focus on `QEvent::MouseButtonPress`:
+
+```c++
+static ads::CDockWidget* createVTK2DWindow(QMenu* ViewMenu, QObject* EventFilter)
+{
+    QVTKOpenGLStereoWidget* qvtkOpenGLStereoWidget = new QVTKOpenGLStereoWidget;
+    ads::CDockWidget* DockWidget = new ads::CDockWidget("2D Window");
+    DockWidget->setWidget(qvtkOpenGLStereoWidget);
+    qvtkOpenGLStereoWidget->installEventFilter(EventFilter);
+    qvtkOpenGLStereoWidget->setProperty("DockWidget", QVariant::fromValue(DockWidget));
+    return DockWidget;
+}
+```
+
+Now we can use the event filter function to react on mouse events and then
+use the dock manager function `setDockWidgetFocused()` to switch the focus:
+
+```c++
+bool CMainWindow::eventFilter(QObject *watched, QEvent *event)
+{
+    if (event->type() == QEvent::MouseButtonPress)
+    {
+        QVTKOpenGLStereoWidget* vtkWidget =  qobject_cast<QVTKOpenGLStereoWidget*>(watched);
+        auto vDockWidget = vtkWidget->property("DockWidget");
+        ads::CDockWidget* DockWidget = nullptr;
+        if (vDockWidget.isValid())
+        {
+            DockWidget = qvariant_cast<ads::CDockWidget*>(vDockWidget);
+        }
+
+        if (DockWidget)
+        {
+            d->DockManager->setDockWidgetFocused(DockWidget);
+        }
+    }
+    return false;
+}
+```
+
 ## Styling
 
 The Advanced Docking System supports styling via [Qt Style Sheets](https://doc.qt.io/qt-5/stylesheet.html). All components like splitters, tabs, buttons, titlebar and

examples/deleteonclose/main.cpp

@@ -10,6 +10,7 @@ int main(int argc, char *argv[])
     QApplication a(argc, argv);
     QMainWindow w;
 
+    ads::CDockManager::setConfigFlag(ads::CDockManager::FocusHighlighting, true);
     auto dockManager = new ads::CDockManager(&w);
 
     QAction *action = new QAction("New Delete On Close", &w);

setup.py

@@ -214,6 +214,7 @@ class build_ext(sipdistutils.build_ext):
         # /usr/bin/rcc -name ads ../../Qt-Advanced-Docking-System/src/ads.qrc -o release/qrc_ads.cpp
         
         cppsources = [source for source in ext.sources if source.endswith(".cpp")]
+        headersources = ['src/DockAreaTitleBar_p.h']
 
         dir_util.mkpath(self.build_temp, dry_run=self.dry_run)
 
@@ -247,6 +248,30 @@ class build_ext(sipdistutils.build_ext):
                 if os.path.getsize(out_file) > 0:
                     ext.sources.append(out_file)
 
+        # Run moc on all orphan header files.
+        for source in headersources:
+            # *.cpp -> *.moc
+            moc_file = os.path.basename(source).replace(".h", ".moc")
+            out_file = os.path.join(self.build_temp, moc_file)
+
+            if newer(source, out_file) or self.force:
+                spawn.spawn(get_moc_args(out_file, source),
+                            dry_run=self.dry_run)
+
+            header = source
+            if os.path.exists(header):
+                # *.h -> moc_*.cpp
+                moc_file = "moc_" + os.path.basename(header).replace(
+                    ".h", ".cpp")
+                out_file = os.path.join(self.build_temp, moc_file)
+
+                if newer(header, out_file) or self.force:
+                    spawn.spawn(get_moc_args(out_file, header),
+                                dry_run=self.dry_run)
+
+                if os.path.getsize(out_file) > 0:
+                    ext.sources.append(out_file)
+
         # Add the temp build directory to include path, for compiler to find
         # the created .moc files
         ext.include_dirs += [self._sip_output_dir()]

sip/DockAreaTitleBar_p.sip

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

sip/DockAreaWidget.sip

@@ -32,6 +32,7 @@ public:
 	virtual ~CDockAreaWidget();
 	ads::CDockManager* dockManager() const;
 	ads::CDockContainerWidget* dockContainer() const;
+	virtual QSize minimumSizeHint() const;
 	QRect titleBarGeometry() const;
 	QRect contentAreaGeometry() const;
 	int dockWidgetsCount() const;

sip/DockManager.sip

@@ -194,8 +194,8 @@ public:
 	const QList<ads::CDockContainerWidget*> dockContainers() const;
 	const QList<ads::CFloatingDockContainer*> floatingWidgets() const;
 	unsigned int zOrderIndex() const;
-	QByteArray saveState(int version = 1) const;
+	QByteArray saveState(int version = 0) const;
-	bool restoreState(const QByteArray &state, int version = 1);
+	bool restoreState(const QByteArray &state, int version = 0);
 	void addPerspective(const QString& UniquePrespectiveName);
 	void removePerspective(const QString& Name);
 	void removePerspectives(const QStringList& Names);

sip/FloatingDockContainer.sip

@@ -27,6 +27,7 @@ public:
 
 	virtual void moveFloating() = 0;
 	virtual void finishDragging() = 0;
+	virtual ~IFloatingWidget();
 };
 
 
@@ -56,6 +57,10 @@ protected:
 	virtual void closeEvent(QCloseEvent *event);
 	virtual void hideEvent(QHideEvent *event);
 	virtual void showEvent(QShowEvent *event);
+	%If (WS_WIN)
+	virtual bool nativeEvent(const QByteArray &eventType, void *message, long *result);
+	%End
+
 
 public:
 	CFloatingDockContainer(ads::CDockManager* DockManager /TransferThis/);

sip/FloatingDragPreview.sip

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

sip/ads.sip

@@ -5,6 +5,7 @@
 %Include ads_globals.sip
 %Include DockWidget.sip
 %Include DockAreaTabBar.sip
+%Include DockAreaTitleBar_p.sip
 %Include DockAreaTitleBar.sip
 %Include DockAreaWidget.sip
 %Include DockComponentsFactory.sip

sip/ads_globals.sip

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

src/CMakeLists.txt

@@ -17,6 +17,7 @@ set(ads_SRCS
     DockWidget.cpp
     DockWidgetTab.cpp
     DockingStateReader.cpp
+    DockFocusController.cpp
     ElidingLabel.cpp
     FloatingDockContainer.cpp
     FloatingDragPreview.cpp
@@ -37,6 +38,7 @@ set(ads_INSTALL_INCLUDE
     DockWidget.h
     DockWidgetTab.h
     DockingStateReader.h
+    DockFocusController.h
     ElidingLabel.h
     FloatingDockContainer.h
     FloatingDragPreview.h

src/DockAreaTitleBar.cpp

@@ -465,6 +465,11 @@ void CDockAreaTitleBar::mousePressEvent(QMouseEvent* ev)
 		ev->accept();
 		d->DragStartMousePos = ev->pos();
 		d->DragState = DraggingMousePressed;
+
+		if (CDockManager::configFlags().testFlag(CDockManager::FocusHighlighting))
+		{
+			d->TabBar->currentTab()->setFocus(Qt::OtherFocusReason);
+		}
 		return;
 	}
 	Super::mousePressEvent(ev);
@@ -485,6 +490,7 @@ void CDockAreaTitleBar::mouseReleaseEvent(QMouseEvent* ev)
 		{
 			d->FloatingWidget->finishDragging();
 		}
+
 		return;
 	}
 	Super::mouseReleaseEvent(ev);

src/DockAreaWidget.cpp

@@ -413,6 +413,7 @@ void CDockAreaWidget::insertDockWidget(int index, CDockWidget* DockWidget,
 	bool Activate)
 {
 	d->ContentsLayout->insertWidget(index, DockWidget);
+	DockWidget->setDockArea(this);
 	DockWidget->tabWidget()->setDockAreaWidget(this);
 	auto TabWidget = DockWidget->tabWidget();
 	// Inserting the tab will change the current index which in turn will
@@ -428,7 +429,6 @@ void CDockAreaWidget::insertDockWidget(int index, CDockWidget* DockWidget,
 	{
 		setCurrentIndex(index);
 	}
-	DockWidget->setDockArea(this);
 	// If this dock area is hidden, then we need to make it visible again
 	// by calling DockWidget->toggleViewInternal(true);
 	if (!this->isVisible() && d->ContentsLayout->count() > 1 && !dockManager()->isRestoringState())

src/DockContainerWidget.cpp

@@ -1459,6 +1459,13 @@ void CDockContainerWidget::dropFloatingWidget(CFloatingDockContainer* FloatingWi
 		// level widget anymore
 		CDockWidget::emitTopLevelEventForWidget(SingleDockWidget, false);
 	}
+
+	window()->activateWindow();
+	if (SingleDroppedDockWidget)
+	{
+		d->DockManager->notifyWidgetOrAreaRelocation(SingleDroppedDockWidget);
+	}
+	d->DockManager->notifyFloatingWidgetDrop(FloatingWidget);
 }
 
 
@@ -1478,6 +1485,19 @@ void CDockContainerWidget::dropWidget(QWidget* Widget, DockWidgetArea DropArea,
 	// If there was a top level widget before the drop, then it is not top
 	// level widget anymore
 	CDockWidget::emitTopLevelEventForWidget(SingleDockWidget, false);
+	CDockWidget* DockWidget = qobject_cast<CDockWidget*>(Widget);
+	if (!DockWidget)
+	{
+		CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(Widget);
+		auto OpenDockWidgets = DockArea->openedDockWidgets();
+		if (OpenDockWidgets.count() == 1)
+		{
+			DockWidget = OpenDockWidgets[0];
+		}
+	}
+
+	window()->activateWindow();
+	d->DockManager->notifyWidgetOrAreaRelocation(Widget);
 }
 
 

src/DockContainerWidget.h

@@ -193,7 +193,7 @@ public:
 	bool isInFrontOf(CDockContainerWidget* Other) const;
 
 	/**
-	 * Returns the dock area at teh given global position or 0 if there is no
+	 * Returns the dock area at the given global position or 0 if there is no
 	 * dock area at this position
 	 */
 	CDockAreaWidget* dockAreaAt(const QPoint& GlobalPos) const;

src/DockFocusController.cpp

@@ -0,0 +1,322 @@
+//============================================================================
+/// \file   DockFocusController.cpp
+/// \author Uwe Kindler
+/// \date   05.06.2020
+/// \brief  Implementation of CDockFocusController class
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include "DockFocusController.h"
+
+#include <algorithm>
+#include <iostream>
+
+#include <QPointer>
+#include <QApplication>
+
+#include "DockWidget.h"
+#include "DockAreaWidget.h"
+#include "DockWidgetTab.h"
+#include "DockContainerWidget.h"
+#include "FloatingDockContainer.h"
+#include "DockManager.h"
+#include "DockAreaTitleBar.h"
+
+#ifdef Q_OS_LINUX
+#include "linux/FloatingWidgetTitleBar.h"
+#endif
+
+namespace ads
+{
+/**
+ * Private data class of CDockFocusController class (pimpl)
+ */
+struct DockFocusControllerPrivate
+{
+	CDockFocusController *_this;
+	QPointer<CDockWidget> FocusedDockWidget = nullptr;
+	QPointer<CDockAreaWidget> FocusedArea = nullptr;
+#ifdef Q_OS_LINUX
+        QPointer<CFloatingDockContainer> FloatingWidget = nullptr;
+#endif
+	CDockManager* DockManager;
+
+	/**
+	 * Private data constructor
+	 */
+	DockFocusControllerPrivate(CDockFocusController *_public);
+
+	/**
+	 * This function updates the focus style of the given dock widget and
+	 * the dock area that it belongs to
+	 */
+	void updateDockWidgetFocus(CDockWidget* DockWidget);
+};
+// struct DockFocusControllerPrivate
+
+
+//===========================================================================
+static void updateDockWidgetFocusStyle(CDockWidget* DockWidget, bool Focused)
+{
+	DockWidget->setProperty("focused", Focused);
+	DockWidget->tabWidget()->setProperty("focused", Focused);
+	DockWidget->tabWidget()->updateStyle();
+	internal::repolishStyle(DockWidget);
+}
+
+
+//===========================================================================
+static void updateDockAreaFocusStyle(CDockAreaWidget* DockArea, bool Focused)
+{
+	DockArea->setProperty("focused", Focused);
+	internal::repolishStyle(DockArea);
+	internal::repolishStyle(DockArea->titleBar());
+}
+
+
+//===========================================================================
+#ifdef Q_OS_LINUX
+static void updateFloatingWidgetFocusStyle(CFloatingDockContainer* FloatingWidget, bool Focused)
+{
+    auto TitleBar = qobject_cast<CFloatingWidgetTitleBar*>(FloatingWidget->titleBarWidget());
+    if (!TitleBar)
+    {
+        return;
+    }
+    TitleBar->setProperty("focused", Focused);
+    TitleBar->updateStyle();
+}
+#endif
+
+
+//============================================================================
+DockFocusControllerPrivate::DockFocusControllerPrivate(
+    CDockFocusController *_public) :
+	_this(_public)
+{
+
+}
+
+
+//============================================================================
+void DockFocusControllerPrivate::updateDockWidgetFocus(CDockWidget* DockWidget)
+{
+	CDockAreaWidget* NewFocusedDockArea = nullptr;
+	if (FocusedDockWidget)
+	{
+		updateDockWidgetFocusStyle(FocusedDockWidget, false);
+	}
+
+	CDockWidget* old = FocusedDockWidget;
+	FocusedDockWidget = DockWidget;
+	updateDockWidgetFocusStyle(FocusedDockWidget, true);
+	NewFocusedDockArea = FocusedDockWidget->dockAreaWidget();
+	if (NewFocusedDockArea && (FocusedArea != NewFocusedDockArea))
+	{
+		if (FocusedArea)
+		{
+			QObject::disconnect(FocusedArea, SIGNAL(viewToggled(bool)), _this, SLOT(onFocusedDockAreaViewToggled(bool)));
+			updateDockAreaFocusStyle(FocusedArea, false);
+		}
+
+		FocusedArea = NewFocusedDockArea;
+		updateDockAreaFocusStyle(FocusedArea, true);
+		QObject::connect(FocusedArea, SIGNAL(viewToggled(bool)), _this, SLOT(onFocusedDockAreaViewToggled(bool)));
+	}
+
+
+    auto NewFloatingWidget = FocusedDockWidget->dockContainer()->floatingWidget();
+    if (NewFloatingWidget)
+    {
+    	NewFloatingWidget->setProperty("FocusedDockWidget", QVariant::fromValue(DockWidget));
+    }
+
+
+#ifdef Q_OS_LINUX
+	// This code is required for styling the floating widget titlebar for linux
+	// depending on the current focus state
+    if (FloatingWidget == NewFloatingWidget)
+    {
+        return;
+    }
+
+    if (FloatingWidget)
+    {
+        updateFloatingWidgetFocusStyle(FloatingWidget, false);
+    }
+    FloatingWidget = NewFloatingWidget;
+
+    if (FloatingWidget)
+    {
+        updateFloatingWidgetFocusStyle(FloatingWidget, true);
+    }
+#endif
+
+    if (old != DockWidget)
+    {
+    	emit DockManager->focusedDockWidgetChanged(old, DockWidget);
+    }
+}
+
+
+
+//============================================================================
+CDockFocusController::CDockFocusController(CDockManager* DockManager) :
+	Super(DockManager),
+	d(new DockFocusControllerPrivate(this))
+{
+	d->DockManager = DockManager;
+	connect(QApplication::instance(), SIGNAL(focusChanged(QWidget*, QWidget*)),
+			this, SLOT(onApplicationFocusChanged(QWidget*, QWidget*)));
+	connect(d->DockManager, SIGNAL(stateRestored()), SLOT(onStateRestored()));
+}
+
+//============================================================================
+CDockFocusController::~CDockFocusController()
+{
+	delete d;
+}
+
+
+//===========================================================================
+void CDockFocusController::onApplicationFocusChanged(QWidget* focusedOld, QWidget* focusedNow)
+{
+	if (d->DockManager->isRestoringState())
+	{
+		return;
+	}
+
+	Q_UNUSED(focusedOld)
+	if (!focusedNow)
+	{
+		return;
+	}
+
+	CDockWidget* DockWidget = nullptr;
+	auto DockWidgetTab = qobject_cast<CDockWidgetTab*>(focusedNow);
+	if (DockWidgetTab)
+	{
+		DockWidget = DockWidgetTab->dockWidget();
+	}
+
+	if (!DockWidget)
+	{
+		DockWidget = qobject_cast<CDockWidget*>(focusedNow);
+	}
+
+	if (!DockWidget)
+	{
+		DockWidget = internal::findParent<CDockWidget*>(focusedNow);
+	}
+
+#ifdef Q_OS_LINUX
+    if (!DockWidget)
+	{
+		return;
+	}
+#else
+    if (!DockWidget || DockWidget->tabWidget()->isHidden())
+	{
+    	return;
+	}
+#endif
+
+	d->updateDockWidgetFocus(DockWidget);
+}
+
+
+//===========================================================================
+void CDockFocusController::setDockWidgetFocused(CDockWidget* focusedNow)
+{
+	d->updateDockWidgetFocus(focusedNow);
+}
+
+
+//===========================================================================
+void CDockFocusController::onFocusedDockAreaViewToggled(bool Open)
+{
+	if (d->DockManager->isRestoringState())
+	{
+		return;
+	}
+
+	CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(sender());
+	if (!DockArea || Open)
+	{
+		return;
+	}
+	auto Container = DockArea->dockContainer();
+	auto OpenedDockAreas = Container->openedDockAreas();
+	if (OpenedDockAreas.isEmpty())
+	{
+		return;
+	}
+
+	CDockManager::setWidgetFocus(OpenedDockAreas[0]->currentDockWidget()->tabWidget());
+}
+
+
+//===========================================================================
+void CDockFocusController::notifyWidgetOrAreaRelocation(QWidget* DroppedWidget)
+{
+	if (d->DockManager->isRestoringState())
+	{
+		return;
+	}
+
+	CDockWidget* DockWidget = qobject_cast<CDockWidget*>(DroppedWidget);
+	if (DockWidget)
+	{
+		CDockManager::setWidgetFocus(DockWidget->tabWidget());
+		return;
+	}
+
+	CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(DroppedWidget);
+	if (!DockArea)
+	{
+		return;
+	}
+
+	DockWidget = DockArea->currentDockWidget();
+	CDockManager::setWidgetFocus(DockWidget->tabWidget());
+}
+
+
+//===========================================================================
+void CDockFocusController::notifyFloatingWidgetDrop(CFloatingDockContainer* FloatingWidget)
+{
+	if (!FloatingWidget || d->DockManager->isRestoringState())
+	{
+		return;
+	}
+
+	auto vDockWidget = FloatingWidget->property("FocusedDockWidget");
+	if (!vDockWidget.isValid())
+	{
+		return;
+	}
+
+	auto DockWidget = vDockWidget.value<CDockWidget*>();
+	if (DockWidget)
+	{
+		DockWidget->dockAreaWidget()->setCurrentDockWidget(DockWidget);
+		CDockManager::setWidgetFocus(DockWidget->tabWidget());
+	}
+}
+
+
+//==========================================================================
+void CDockFocusController::onStateRestored()
+{
+	if (d->FocusedDockWidget)
+	{
+		updateDockWidgetFocusStyle(d->FocusedDockWidget, false);
+	}
+}
+
+} // namespace ads
+
+//---------------------------------------------------------------------------
+// EOF DockFocusController.cpp

src/DockFocusController.h

@@ -0,0 +1,89 @@
+#ifndef DockFocusControllerH
+#define DockFocusControllerH
+//============================================================================
+/// \file   DockFocusController.h
+/// \author Uwe Kindler
+/// \date   05.06.2020
+/// \brief  Declaration of CDockFocusController class
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include <QObject>
+#include "ads_globals.h"
+#include "DockManager.h"
+
+namespace ads
+{
+struct DockFocusControllerPrivate;
+class CDockManager;
+class CFloatingDockContainer;
+
+/**
+ * Manages focus styling of dock widgets and handling of focus changes
+ */
+class ADS_EXPORT CDockFocusController : public QObject
+{
+	Q_OBJECT
+private:
+	DockFocusControllerPrivate* d; ///< private data (pimpl)
+    friend struct DockFocusControllerPrivate;
+
+private slots:
+	void onApplicationFocusChanged(QWidget *old, QWidget *now);
+	void onFocusedDockAreaViewToggled(bool Open);
+	void onStateRestored();
+
+public:
+	using Super = QObject;
+	/**
+	 * Default Constructor
+	 */
+	CDockFocusController(CDockManager* DockManager);
+
+	/**
+	 * Virtual Destructor
+	 */
+	virtual ~CDockFocusController();
+
+	/**
+	 * Helper function to set focus depending on the configuration of the
+	 * FocusStyling flag
+	 */
+	template <class QWidgetPtr>
+	static void setWidgetFocus(QWidgetPtr widget)
+	{
+		if (!CDockManager::configFlags().testFlag(CDockManager::FocusHighlighting))
+		{
+			return;
+		}
+
+		widget->setFocus(Qt::OtherFocusReason);
+	}
+
+	/**
+	 * A container needs to call this function if a widget has been dropped
+	 * into it
+	 */
+	void notifyWidgetOrAreaRelocation(QWidget* RelocatedWidget);
+
+	/**
+	 * This function is called, if a floating widget has been dropped into
+	 * an new position.
+	 * When this function is called, all dock widgets of the FloatingWidget
+	 * are already inserted into its new position
+	 */
+	void notifyFloatingWidgetDrop(CFloatingDockContainer* FloatingWidget);
+
+public slots:
+	/**
+	 * Request a focus change to the given dock widget
+	 */
+	void setDockWidgetFocused(CDockWidget* focusedNow);
+}; // class DockFocusController
+}
+ // namespace ads
+//-----------------------------------------------------------------------------
+#endif // DockFocusControllerH
+

src/DockManager.cpp

@@ -53,6 +53,12 @@
 #include "DockAreaWidget.h"
 #include "IconProvider.h"
 #include "DockingStateReader.h"
+#include "DockAreaTitleBar.h"
+#include "DockFocusController.h"
+
+#ifdef Q_OS_LINUX
+#include "linux/FloatingWidgetTitleBar.h"
+#endif
 
 
 /**
@@ -60,7 +66,7 @@
  * name. Normally, when resources are built as part of the application, the
  * resources are loaded automatically at startup. The Q_INIT_RESOURCE() macro
  * is necessary on some platforms for resources stored in a static library.
- * Because GCC caues a linker error if we put Q_INIT_RESOURCE into the
+ * Because GCC causes a linker error if we put Q_INIT_RESOURCE into the
  * loadStyleSheet() function, we place it into a function outside of the ads
  * namespace
  */
@@ -72,6 +78,16 @@ static void initResource()
 
 namespace ads
 {
+/**
+ * Internal file version in case the structure changes internally
+ */
+enum eStateFileVersion
+{
+	InitialVersion = 0,      //!< InitialVersion
+	Version1 = 1,            //!< Version1
+	CurrentVersion = Version1//!< CurrentVersion
+};
+
 static CDockManager::ConfigFlags StaticConfigFlags = CDockManager::DefaultNonOpaqueConfig;
 
 /**
@@ -91,6 +107,7 @@ struct DockManagerPrivate
 	CDockManager::eViewMenuInsertionOrder MenuInsertionOrder = CDockManager::MenuAlphabeticallySorted;
 	bool RestoringState = false;
 	QVector<CFloatingDockContainer*> UninitializedFloatingWidgets;
+	CDockFocusController* FocusController = nullptr;
 
 	/**
 	 * Private data constructor
@@ -239,8 +256,20 @@ bool DockManagerPrivate::restoreStateFromXml(const QByteArray &state,  int versi
     {
     	return false;
     }
-
     s.setFileVersion(v);
+
+    ADS_PRINT(s.attributes().value("UserVersion"));
+    // Older files do not support UserVersion but we still want to load them so
+    // we first test if the attribute exists
+    if (!s.attributes().value("UserVersion").isEmpty())
+    {
+		v = s.attributes().value("UserVersion").toInt(&ok);
+		if (!ok || v != version)
+		{
+			return false;
+		}
+    }
+
     bool Result = true;
 #ifdef ADS_DEBUG_PRINT
     int  DockContainers = s.attributes().value("Containers").toInt();
@@ -437,6 +466,11 @@ CDockManager::CDockManager(QWidget *parent) :
 	d->ContainerOverlay = new CDockOverlay(this, CDockOverlay::ModeContainerOverlay);
 	d->Containers.append(this);
 	d->loadStylesheet();
+
+	if (CDockManager::configFlags().testFlag(CDockManager::FocusHighlighting))
+	{
+		d->FocusController = new CDockFocusController(this);
+	}
 }
 
 //============================================================================
@@ -528,7 +562,8 @@ QByteArray CDockManager::saveState(int version) const
 	s.setAutoFormatting(ConfigFlags.testFlag(XmlAutoFormattingEnabled));
     s.writeStartDocument();
 		s.writeStartElement("QtAdvancedDockingSystem");
-		s.writeAttribute("Version", QString::number(version));
+		s.writeAttribute("Version", QString::number(CurrentVersion));
+		s.writeAttribute("UserVersion", QString::number(version));
 		s.writeAttribute("Containers", QString::number(d->Containers.count()));
 		for (auto Container : d->Containers)
 		{
@@ -570,12 +605,11 @@ bool CDockManager::restoreState(const QByteArray &state, int version)
 	emit restoringState();
 	bool Result = d->restoreState(state, version);
 	d->RestoringState = false;
-	emit stateRestored();
 	if (!IsHidden)
 	{
 		show();
 	}
-
+	emit stateRestored();
 	return Result;
 }
 
@@ -872,6 +906,36 @@ CIconProvider& CDockManager::iconProvider()
 }
 
 
+//===========================================================================
+void CDockManager::notifyWidgetOrAreaRelocation(QWidget* DroppedWidget)
+{
+	if (d->FocusController)
+	{
+		d->FocusController->notifyWidgetOrAreaRelocation(DroppedWidget);
+	}
+}
+
+
+//===========================================================================
+void CDockManager::notifyFloatingWidgetDrop(CFloatingDockContainer* FloatingWidget)
+{
+	if (d->FocusController)
+	{
+		d->FocusController->notifyFloatingWidgetDrop(FloatingWidget);
+	}
+}
+
+
+//===========================================================================
+void CDockManager::setDockWidgetFocused(CDockWidget* DockWidget)
+{
+	if (d->FocusController)
+	{
+		d->FocusController->setDockWidgetFocused(DockWidget);
+	}
+}
+
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockManager.h

@@ -84,6 +84,7 @@ private:
 	friend struct FloatingDragPreviewPrivate;
 	friend class CDockAreaTitleBar;
 
+
 protected:
 	/**
 	 * Registers the given floating widget in the internal list of
@@ -118,6 +119,22 @@ protected:
 	 */
 	CDockOverlay* dockAreaOverlay() const;
 
+
+	/**
+	 * A container needs to call this function if a widget has been dropped
+	 * into it
+	 */
+	void notifyWidgetOrAreaRelocation(QWidget* RelocatedWidget);
+
+	/**
+	 * This function is called, if a floating widget has been dropped into
+	 * an new position.
+	 * When this function is called, all dock widgets of the FloatingWidget
+	 * are already inserted into its new position
+	 */
+	void notifyFloatingWidgetDrop(CFloatingDockContainer* FloatingWidget);
+
+
 	/**
 	 * Show the floating widgets that has been created floating
 	 */
@@ -161,7 +178,7 @@ public:
 		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
-
+		FocusHighlighting = 0x200000, //!< enables styling of focused dock widget tabs or floating widget titlebar
 
         DefaultDockAreaButtons = DockAreaHasCloseButton
 							   | DockAreaHasUndockButton
@@ -308,8 +325,12 @@ public:
 	 * If auto formatting is enabled, the output is intended and line wrapped.
 	 * The XmlMode XmlAutoFormattingDisabled is better if you would like to have
 	 * a more compact XML output - i.e. for storage in ini files.
+	 * The version number is stored as part of the data.
+	 * To restore the saved state, pass the return value and version number
+	 * to restoreState().
+	 * \see restoreState()
 	 */
-	QByteArray saveState(int version = Version1) const;
+	QByteArray saveState(int version = 0) const;
 
 	/**
 	 * Restores the state of this dockmanagers dockwidgets.
@@ -317,8 +338,9 @@ public:
 	 * not match, the dockmanager's state is left unchanged, and this function
 	 * returns false; otherwise, the state is restored, and this function
 	 * returns true.
+	 * \see saveState()
 	 */
-	bool restoreState(const QByteArray &state, int version = Version1);
+	bool restoreState(const QByteArray &state, int version = 0);
 
 	/**
 	 * Saves the current perspective to the internal list of perspectives.
@@ -405,12 +427,34 @@ public:
 	 */
 	static int startDragDistance();
 
+	/**
+	 * Helper function to set focus depending on the configuration of the
+	 * FocusStyling flag
+	 */
+	template <class QWidgetPtr>
+	static void setWidgetFocus(QWidgetPtr widget)
+	{
+		if (!CDockManager::configFlags().testFlag(CDockManager::FocusHighlighting))
+		{
+			return;
+		}
+
+		widget->setFocus(Qt::OtherFocusReason);
+	}
+
 public slots:
 	/**
 	 * Opens the perspective with the given name.
 	 */
 	void openPerspective(const QString& PerspectiveName);
 
+	/**
+	 * Request a focus change to the given dock widget.
+	 * This function only has an effect, if the flag CDockManager::FocusStyling
+	 * is enabled
+	 */
+	void setDockWidgetFocused(CDockWidget* DockWidget);
+
 signals:
 	/**
 	 * This signal is emitted if the list of perspectives changed
@@ -479,6 +523,13 @@ signals:
      * docking system but it is not deleted yet.
      */
     void dockWidgetRemoved(CDockWidget* DockWidget);
+
+    /**
+     * This signal is emitted if the focused dock widget changed.
+     * Both old and now can be nullptr.
+     * The focused dock widget is the one that is highlighted in the GUI
+     */
+    void focusedDockWidgetChanged(CDockWidget* old, CDockWidget* now);
 }; // class DockManager
 } // namespace ads
 //-----------------------------------------------------------------------------

src/DockWidget.cpp

@@ -235,6 +235,11 @@ CDockWidget::CDockWidget(const QString &title, QWidget *parent) :
 	connect(d->ToggleViewAction, SIGNAL(triggered(bool)), this,
 		SLOT(toggleView(bool)));
 	setToolbarFloatingStyle(false);
+
+	if (CDockManager::configFlags().testFlag(CDockManager::FocusHighlighting))
+	{
+		setFocusPolicy(Qt::ClickFocus);
+	}
 }
 
 //============================================================================

src/DockWidgetTab.cpp

@@ -160,6 +160,7 @@ struct DockWidgetTabPrivate
 		GlobalDragStartMousePosition = GlobalPos;
 		DragStartMousePosition = _this->mapFromGlobal(GlobalPos);
 	}
+
 };
 // struct DockWidgetTabPrivate
 
@@ -284,6 +285,10 @@ CDockWidgetTab::CDockWidgetTab(CDockWidget* DockWidget, QWidget *parent) :
 	setAttribute(Qt::WA_NoMousePropagation, true);
 	d->DockWidget = DockWidget;
 	d->createLayout();
+	if (CDockManager::configFlags().testFlag(CDockManager::FocusHighlighting))
+	{
+		setFocusPolicy(Qt::ClickFocus);
+	}
 }
 
 //============================================================================
@@ -461,16 +466,33 @@ void CDockWidgetTab::setActiveTab(bool active)
 	bool AllTabsHaveCloseButton = d->testConfigFlag(CDockManager::AllTabsHaveCloseButton);
 	bool TabHasCloseButton = (ActiveTabHasCloseButton && active) | AllTabsHaveCloseButton;
 	d->CloseButton->setVisible(DockWidgetClosable && TabHasCloseButton);
-	if (d->IsActiveTab == active)
+
+	// Focus related stuff
+	if (CDockManager::configFlags().testFlag(CDockManager::FocusHighlighting) && !d->DockWidget->dockManager()->isRestoringState())
+	{
+		bool UpdateFocusStyle = false;
+		if (active && !hasFocus())
+		{
+			setFocus(Qt::OtherFocusReason);
+			UpdateFocusStyle = true;
+		}
+
+		if (d->IsActiveTab == active)
+		{
+			if (UpdateFocusStyle)
+			{
+				updateStyle();
+			}
+			return;
+		}
+	}
+	else if (d->IsActiveTab == active)
 	{
 		return;
 	}
 
 	d->IsActiveTab = active;
-	style()->unpolish(this);
+	updateStyle();
-	style()->polish(this);
-	d->TitleLabel->style()->unpolish(d->TitleLabel);
-	d->TitleLabel->style()->polish(d->TitleLabel);
 	update();
 	updateGeometry();
 
@@ -641,6 +663,13 @@ void CDockWidgetTab::setElideMode(Qt::TextElideMode mode)
 }
 
 
+//============================================================================
+void CDockWidgetTab::updateStyle()
+{
+	internal::repolishStyle(this, internal::RepolishDirectChildren);
+}
+
+
 
 
 } // namespace ads

src/DockWidgetTab.h

@@ -39,6 +39,7 @@ namespace ads
 class CDockWidget;
 class CDockAreaWidget;
 struct DockWidgetTabPrivate;
+class CDockManager;
 
 /**
  * A dock widget tab that shows a title and an icon.
@@ -54,6 +55,7 @@ private:
 	DockWidgetTabPrivate* d; ///< private data (pimpl)
 	friend struct DockWidgetTabPrivate;
 	friend class CDockWidget;
+	friend class CDockManager;
 	void onDockWidgetFeaturesChanged();
 
 private slots:
@@ -152,6 +154,10 @@ public:
 	 */
 	void setElideMode(Qt::TextElideMode mode);
 
+	/**
+	 * Update stylesheet style if a property changes
+	 */
+	void updateStyle();
 
 public slots:
 	virtual void setVisible(bool visible) override;

src/FloatingDockContainer.cpp

@@ -637,6 +637,8 @@ CFloatingDockContainer::CFloatingDockContainer(CDockAreaWidget *DockArea) :
     {
     	TopLevelDockWidget->emitTopLevelChanged(true);
     }
+
+    d->DockManager->notifyWidgetOrAreaRelocation(DockArea);
 }
 
 //============================================================================
@@ -652,6 +654,8 @@ CFloatingDockContainer::CFloatingDockContainer(CDockWidget *DockWidget) :
     {
     	TopLevelDockWidget->emitTopLevelChanged(true);
     }
+
+    d->DockManager->notifyWidgetOrAreaRelocation(DockWidget);
 }
 
 //============================================================================
@@ -800,10 +804,17 @@ void CFloatingDockContainer::hideEvent(QHideEvent *event)
 	d->Hiding = false;
 }
 
+
 //============================================================================
 void CFloatingDockContainer::showEvent(QShowEvent *event)
 {
 	Super::showEvent(event);
+#ifdef Q_OS_LINUX
+    if (CDockManager::testConfigFlag(CDockManager::FocusHighlighting))
+    {
+        this->window()->activateWindow();
+    }
+#endif
 }
 
 
@@ -978,6 +989,109 @@ void CFloatingDockContainer::finishDragging()
    d->titleMouseReleaseEvent();
 }
 
+
+#ifdef Q_OS_MACOS
+//============================================================================
+bool CFloatingDockContainer::event(QEvent *e)
+{
+	switch (d->DraggingState)
+	{
+	case DraggingInactive:
+	{
+		// Normally we would check here, if the left mouse button is pressed.
+		// But from QT version 5.12.2 on the mouse events from
+		// QEvent::NonClientAreaMouseButtonPress return the wrong mouse button
+		// The event always returns Qt::RightButton even if the left button
+		// is clicked.
+		// It is really great to work around the whole NonClientMouseArea
+		// bugs
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 12, 2))
+		if (e->type() == QEvent::NonClientAreaMouseButtonPress /*&& QGuiApplication::mouseButtons().testFlag(Qt::LeftButton)*/)
+#else
+		if (e->type() == QEvent::NonClientAreaMouseButtonPress && QGuiApplication::mouseButtons().testFlag(Qt::LeftButton))
+#endif
+		{
+			ADS_PRINT("FloatingWidget::event Event::NonClientAreaMouseButtonPress" << e->type());
+			d->DragStartPos = pos();
+			d->setState(DraggingMousePressed);
+		}
+	}
+	break;
+
+	case DraggingMousePressed:
+		switch (e->type())
+		{
+		case QEvent::NonClientAreaMouseButtonDblClick:
+			ADS_PRINT("FloatingWidget::event QEvent::NonClientAreaMouseButtonDblClick");
+			d->setState(DraggingInactive);
+			break;
+
+		case QEvent::Resize:
+			// If the first event after the mouse press is a resize event, then
+			// the user resizes the window instead of dragging it around.
+			// But there is one exception. If the window is maximized,
+			// then dragging the window via title bar will cause the widget to
+			// leave the maximized state. This in turn will trigger a resize event.
+			// To know, if the resize event was triggered by user via moving a
+			// corner of the window frame or if it was caused by a windows state
+			// change, we check, if we are not in maximized state.
+			if (!isMaximized())
+			{
+				d->setState(DraggingInactive);
+			}
+			break;
+
+		default:
+			break;
+		}
+		break;
+
+	case DraggingFloatingWidget:
+		if (e->type() == QEvent::NonClientAreaMouseButtonRelease)
+		{
+			ADS_PRINT("FloatingWidget::event QEvent::NonClientAreaMouseButtonRelease");
+			d->titleMouseReleaseEvent();
+		}
+		break;
+
+	default:
+		break;
+	}
+
+#if (ADS_DEBUG_LEVEL > 0)
+	qDebug() << QTime::currentTime() << "CFloatingDockContainer::event " << e->type();
+#endif
+	return QWidget::event(e);
+}
+
+
+//============================================================================
+void CFloatingDockContainer::moveEvent(QMoveEvent *event)
+{
+	QWidget::moveEvent(event);
+	switch (d->DraggingState)
+	{
+	case DraggingMousePressed:
+		d->setState(DraggingFloatingWidget);
+		d->updateDropOverlays(QCursor::pos());
+		break;
+
+	case DraggingFloatingWidget:
+		d->updateDropOverlays(QCursor::pos());
+		// In OSX when hiding the DockAreaOverlay the application would set
+		// the main window as the active window for some reason. This fixes
+		// that by resetting the active window to the floating widget after
+		// updating the overlays.
+		QApplication::setActiveWindow(this);
+		break;
+	default:
+		break;
+	}
+
+
+}
+#endif
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/FloatingDockContainer.h

@@ -172,8 +172,7 @@ protected:
 	/**
 	 * Call this function to update the window title
 	 */
-	void updateWindowTitle();
+    void updateWindowTitle();
-
 
 protected: // reimplements QWidget
 	virtual void changeEvent(QEvent *event) override;
@@ -181,6 +180,11 @@ protected: // reimplements QWidget
 	virtual void hideEvent(QHideEvent *event) override;
 	virtual void showEvent(QShowEvent *event) override;
 
+#ifdef Q_OS_MACOS
+	virtual bool event(QEvent *e) override;
+	virtual void moveEvent(QMoveEvent *event) override;
+#endif
+
 #ifdef Q_OS_WIN
 	/**
 	 * Native event filter for handling WM_MOVING messages on Windows

src/ads.qrc

@@ -4,5 +4,6 @@
         <file>images/close-button.svg</file>
         <file>images/close-button-disabled.svg</file>
         <file>stylesheets/default_linux.css</file>
+        <file>images/close-button-focused.svg</file>
     </qresource>
 </RCC>

src/ads_globals.cpp

@@ -31,6 +31,7 @@
 #include <QVariant>
 #include <QPainter>
 #include <QAbstractButton>
+#include <QStyle>
 
 #include "DockSplitter.h"
 #include "DockManager.h"
@@ -118,6 +119,31 @@ void setButtonIcon(QAbstractButton* Button, QStyle::StandardPixmap StandarPixmap
 #endif
 }
 
+
+//============================================================================
+void repolishStyle(QWidget* w, eRepolishChildOptions Options)
+{
+	if (!w)
+	{
+		return;
+	}
+	w->style()->unpolish(w);
+	w->style()->polish(w);
+
+	if (RepolishIgnoreChildren == Options)
+	{
+		return;
+	}
+
+	QList<QWidget*> Children = w->findChildren<QWidget*>(QString(),
+		(RepolishDirectChildren == Options) ? Qt::FindDirectChildrenOnly: Qt::FindChildrenRecursively);
+	for (auto Widget : Children)
+	{
+		Widget->style()->unpolish(Widget);
+		Widget->style()->polish(Widget);
+	}
+}
+
 } // namespace internal
 } // namespace ads
 

src/ads_globals.h

@@ -64,13 +64,6 @@ QT_FORWARD_DECLARE_CLASS(QSplitter)
 
 namespace ads
 {
-enum eStateFileVersion
-{
-	InitialVersion = 0,
-	Version1 = 1,
-	CurrentVersion = Version1
-};
-
 class CDockSplitter;
 
 enum DockWidgetArea
@@ -251,6 +244,21 @@ void setToolTip(QObjectPtr obj, const QString &tip)
 void setButtonIcon(QAbstractButton* Button, QStyle::StandardPixmap StandarPixmap,
 	ads::eIcon CustomIconId);
 
+
+enum eRepolishChildOptions
+{
+	RepolishIgnoreChildren,
+	RepolishDirectChildren,
+	RepolishChildrenRecursively
+};
+
+/**
+ * Calls unpolish() / polish for the style of the given widget to update
+ * stylesheet if a property changes
+ */
+void repolishStyle(QWidget* w, eRepolishChildOptions Options = RepolishIgnoreChildren);
+
+
 } // namespace internal
 } // namespace ads
 

src/images/close-button-disabled.svg

@@ -1,6 +1,4 @@
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-
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    xmlns:dc="http://purl.org/dc/elements/1.1/"
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@@ -9,114 +7,133 @@
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-   xml:space="preserve"
    sodipodi:docname="close-button-disabled.svg"
-   inkscape:version="0.92.3 (2405546, 2018-03-11)"><metadata
+   inkscape:version="1.0 (4035a4fb49, 2020-05-01)"
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+   version="1.1"
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+   id="svg2"
-         rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title></dc:title></cc:Work></rdf:RDF></metadata><defs
+   viewBox="0 0 16 16"
-   id="defs895" /><sodipodi:namedview
+   height="16px"
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+   width="16px">
-   bordercolor="#666666"
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-   objecttolerance="10"
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-   fit-margin-right="0"
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+         dc:description="Menu, Bar, Lines, Option, List, Hamburger, Web"
+         dc:title="Menu, Bar, Lines, Option, List, Hamburger, Web"
+         about="https://iconscout.com/legal#licenses">
+        <dc:creator>
+          <rdf:Bag>
+            <rdf:li>Jemis Mali</rdf:li>
+          </rdf:Bag>
+        </dc:creator>
+      </rdf:Description>
+      <cc:Work
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+        <dc:format>image/svg+xml</dc:format>
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 </svg>

src/images/close-button-focused.svg

@@ -0,0 +1,139 @@
+<?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"
+   sodipodi:docname="close-button-focused.svg"
+   inkscape:version="1.0 (4035a4fb49, 2020-05-01)"
+   version="1.1"
+   id="svg2"
+   viewBox="0 0 16 16"
+   height="16px"
+   width="16px">
+  <style
+     id="style2"></style>
+  <defs
+     id="defs4">
+    <pattern
+       id="EMFhbasepattern"
+       patternUnits="userSpaceOnUse"
+       width="6"
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+         dc:title="Menu, Bar, Lines, Option, List, Hamburger, Web"
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+        <dc:creator>
+          <rdf:Bag>
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+      <cc:Work
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+        <dc:format>image/svg+xml</dc:format>
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src/images/close-button.svg

@@ -1,6 +1,4 @@
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    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
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+   width="16px"
+   height="16px"
+   viewBox="0 0 16 16"
+   id="svg2"
    version="1.1"
-   id="Capa_1"
+   inkscape:version="1.0 (4035a4fb49, 2020-05-01)"
-   x="0px"
+   sodipodi:docname="close-button2.svg">
-   y="0px"
+  <style
-   width="512"
+     id="style2"></style>
-   height="512"
+  <defs
-   viewBox="0 0 512 512"
+     id="defs4">
-   xml:space="preserve"
+    <pattern
-   sodipodi:docname="close-button.svg"
+       y="0"
-   inkscape:version="0.92.3 (2405546, 2018-03-11)"><metadata
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-   id="metadata897"><rdf:RDF><cc:Work
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-       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
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+       position="4,10"
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+       orientation="1,0"
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+    <sodipodi:guide
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+       orientation="0,-1"
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+    <sodipodi:guide
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+       position="12,2"
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+       orientation="1,0"
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+    <sodipodi:guide
-   id="g878"
+       position="14,4"
-   transform="translate(0,155)">
+       orientation="0,-1"
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+       id="guide889" />
-<g
+  </sodipodi:namedview>
-   id="g880"
+  <g
-   transform="translate(0,155)">
+     inkscape:label="Layer 1"
-</g>
+     inkscape:groupmode="layer"
-<g
+     id="layer1"
-   id="g882"
+     transform="translate(0,-1036.3622)">
-   transform="translate(0,155)">
+    <g
-</g>
+       transform="translate(628,-140.49998)"
-<g
+       id="g5228">
-   id="g884"
+      <path
-   transform="translate(0,155)">
+         transform="translate(-628,1176.8622)"
-</g>
+         d="M 4.4765625 4.0019531 A 0.5 0.5 0 0 0 4.1464844 4.1464844 A 0.5 0.5 0 0 0 4.1464844 4.8535156 L 7.2929688 8 L 4.1464844 11.146484 A 0.5 0.5 0 0 0 4.1464844 11.853516 A 0.5 0.5 0 0 0 4.8535156 11.853516 L 8 8.7070312 L 11.146484 11.853516 A 0.5 0.5 0 0 0 11.853516 11.853516 A 0.5 0.5 0 0 0 11.853516 11.146484 L 8.7070312 8 L 11.853516 4.8535156 A 0.5 0.5 0 0 0 11.853516 4.1464844 A 0.5 0.5 0 0 0 11.476562 4.0019531 A 0.5 0.5 0 0 0 11.146484 4.1464844 L 8 7.2929688 L 4.8535156 4.1464844 A 0.5 0.5 0 0 0 4.4765625 4.0019531 z "
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+         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;font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;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;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;clip-rule:nonzero;display:inline;overflow:visible;visibility:visible;isolation:auto;mix-blend-mode:normal;color-interpolation:sRGB;color-interpolation-filters:linearRGB;solid-color:#000000;solid-opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:1px;stroke-linecap:round;stroke-linejoin:miter;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;stop-color:#000000;stop-opacity:1;opacity:1"
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+  </g>
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+  <metadata
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+     id="metadata12">
-   transform="translate(0,155)">
+    <rdf:RDF>
-</g>
+      <rdf:Description
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-   id="g890"
+         dc:title="Menu, Bar, Lines, Option, List, Hamburger, Web"
-   transform="translate(0,155)">
+         dc:description="Menu, Bar, Lines, Option, List, Hamburger, Web"
-</g>
+         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 />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
 </svg>

src/linux/FloatingWidgetTitleBar.cpp

@@ -115,7 +115,7 @@ void FloatingWidgetTitleBarPrivate::createLayout()
 
 //============================================================================
 CFloatingWidgetTitleBar::CFloatingWidgetTitleBar(CFloatingDockContainer *parent) :
-	QWidget(parent),
+    QFrame(parent),
 	d(new FloatingWidgetTitleBarPrivate(this))
 {
 	d->FloatingWidget = parent;
@@ -172,16 +172,26 @@ void CFloatingWidgetTitleBar::mouseMoveEvent(QMouseEvent *ev)
 	Super::mouseMoveEvent(ev);
 }
 
+
 //============================================================================
 void CFloatingWidgetTitleBar::enableCloseButton(bool Enable)
 {
 	d->CloseButton->setEnabled(Enable);
 }
 
+
 //============================================================================
 void CFloatingWidgetTitleBar::setTitle(const QString &Text)
 {
 	d->TitleLabel->setText(Text);
 }
 
+
+//============================================================================
+void CFloatingWidgetTitleBar::updateStyle()
+{
+    internal::repolishStyle(this);
+    internal::repolishStyle(d->TitleLabel);
+}
+
 } // namespace ads

src/linux/FloatingWidgetTitleBar.h

@@ -29,7 +29,7 @@
 //============================================================================
 //                                   INCLUDES
 //============================================================================
-#include <QWidget>
+#include <QFrame>
 
 namespace ads
 {
@@ -45,7 +45,7 @@ struct FloatingWidgetTitleBarPrivate;
  * for the docking system to work properly, we use our own titlebar here to
  * capture the required mouse events.
  */
-class CFloatingWidgetTitleBar : public QWidget
+class CFloatingWidgetTitleBar : public QFrame
 {
 	Q_OBJECT
 private:
@@ -75,6 +75,11 @@ public:
 	 */
 	void setTitle(const QString &Text);
 
+    /**
+     * Update stylesheet style if a property changes
+     */
+    void updateStyle();
+
 signals:
 	/**
 	 * This signal is emitted, if the close button is clicked.

src/src.pro

@@ -45,7 +45,8 @@ HEADERS += \
     DockAreaTitleBar.h \
     ElidingLabel.h \
     IconProvider.h \
-    DockComponentsFactory.h 
+    DockComponentsFactory.h  \
+    DockFocusController.h
 
 
 SOURCES += \
@@ -64,7 +65,8 @@ SOURCES += \
     DockAreaTitleBar.cpp \
     ElidingLabel.cpp \
     IconProvider.cpp \
-    DockComponentsFactory.cpp
+    DockComponentsFactory.cpp \
+    DockFocusController.cpp
 
 
 unix {

src/stylesheets/default.css

@@ -9,10 +9,6 @@ ads--CDockContainerWidget
     background: palette(dark);
 }
 
-ads--CDockContainerWidget QSplitter::handle
-{
-    background: palette(dark);
-}
 
 ads--CDockAreaWidget
 {
@@ -82,13 +78,74 @@ QScrollArea#dockWidgetScrollArea
 
 #tabCloseButton:hover
 {
-	border: 1px solid rgba(0, 0, 0, 32);
+	/*border: 1px solid rgba(0, 0, 0, 32);*/
-	background: rgba(0, 0, 0, 16);
+	background: rgba(0, 0, 0, 24);
 }
 
 #tabCloseButton:pressed
 {
-	background: rgba(0, 0, 0, 32);
+	background: rgba(0, 0, 0, 48);
+}
+
+#tabCloseButton
+{
+	qproperty-icon: url(:/ads/images/close-button.svg);
+	qproperty-iconSize: 16px;
 }
 
 
+ads--CDockSplitter::handle
+{
+    background-color: palette(dark);
+    /* uncomment the following line if you would like to change the size of
+       the splitter handles */
+    /* height: 1px; */
+}
+
+
+/* Focus related styling */
+ads--CDockWidgetTab[focused="true"]
+{
+    background: palette(highlight);
+    border-color: palette(highlight);
+}
+
+ads--CDockWidgetTab[focused="true"] > #tabCloseButton
+{
+	qproperty-icon: url(:/ads/images/close-button-focused.svg)
+}
+
+
+
+ads--CDockWidgetTab[focused="true"] > #tabCloseButton:hover
+{
+	background: rgba(255, 255, 255, 48);
+}
+
+
+ads--CDockWidgetTab[focused="true"] > #tabCloseButton:pressed
+{
+	background: rgba(255, 255, 255, 92);
+}
+
+
+ads--CDockWidgetTab[focused="true"] QLabel
+{
+    color: palette(light);
+}
+
+
+ads--CDockAreaTitleBar
+{
+	background: transparent;
+	border-bottom: 2px solid palette(light);
+	padding-bottom: 0px;
+}
+
+ads--CDockAreaWidget[focused="true"] ads--CDockAreaTitleBar
+{
+	background: transparent;
+	border-bottom: 2px solid palette(highlight);
+	padding-bottom: 0px;
+}
+

src/stylesheets/default_linux.css

@@ -84,13 +84,74 @@ QScrollArea#dockWidgetScrollArea
 
 #tabCloseButton:hover
 {
-        border: 1px solid rgba(0, 0, 0, 32);
+        /*border: 1px solid rgba(0, 0, 0, 32);*/
-        background: rgba(0, 0, 0, 16);
+        background: rgba(0, 0, 0, 24);
 }
 
 #tabCloseButton:pressed
 {
-        background: rgba(0, 0, 0, 32);
+        background: rgba(0, 0, 0, 48);
+}
+
+#tabCloseButton
+{
+        qproperty-icon: url(:/ads/images/close-button.svg);
+        qproperty-iconSize: 16px;
+}
+
+/* Focus related styling */
+ads--CDockWidgetTab[focused="true"]
+{
+    background: palette(highlight);
+    border-color: palette(highlight);
+}
+
+ads--CDockWidgetTab[focused="true"] > #tabCloseButton
+{
+        qproperty-icon: url(:/ads/images/close-button-focused.svg)
 }
 
 
+
+ads--CDockWidgetTab[focused="true"] > #tabCloseButton:hover
+{
+        background: rgba(255, 255, 255, 48);
+}
+
+
+ads--CDockWidgetTab[focused="true"] > #tabCloseButton:pressed
+{
+        background: rgba(255, 255, 255, 92);
+}
+
+ads--CDockWidgetTab[focused="true"] QLabel
+{
+    color: palette(light);
+}
+
+
+ads--CDockAreaTitleBar
+{
+        background: transparent;
+        border-bottom: 2px solid palette(light);
+        padding-bottom: 0px;
+}
+
+ads--CDockAreaWidget[focused="true"] ads--CDockAreaTitleBar
+{
+        background: transparent;
+        border-bottom: 2px solid palette(highlight);
+        padding-bottom: 0px;
+}
+
+
+ads--CFloatingDockContainer[isActiveWindow="true"] ads--CFloatingWidgetTitleBar
+{
+    background: palette(highlight);
+}
+
+
+ads--CFloatingDockContainer[isActiveWindow="true"] ads--CFloatingWidgetTitleBar > QLabel
+{
+    color: palette(light);
+}