Corrected constness of some functions, changed signatur of setCentralWidget function

src/DockAreaWidget.cpp

@@ -968,12 +968,14 @@ CDockAreaTitleBar* CDockAreaWidget::titleBar() const
 
 
 //============================================================================
-bool CDockAreaWidget::isCentralWidgetArea()
+bool CDockAreaWidget::isCentralWidgetArea() const
 {
-    if(dockWidgetsCount()!=1)
+    if (dockWidgetsCount()!= 1)
+    {
         return false;
+    }
 
-    return dockManager()->centralWidget()==dockWidgets()[0];
+    return dockManager()->centralWidget() == dockWidgets()[0];
 }
 
 

src/DockAreaWidget.h

@@ -310,7 +310,7 @@ public:
     /**
      * Returns true if the area contains the central widget of it's manager.
      */
-    bool isCentralWidgetArea();
+    bool isCentralWidgetArea() const;
 
 public slots:
 	/**

src/DockContainerWidget.cpp

@@ -323,14 +323,15 @@ public:
 	}
 
     /**
-     * This finction forces the dock container widget to update handles of splitters
-     * based on resize modes of dock widgets aontained in the container.
+     * This function forces the dock container widget to update handles of splitters
+     * based if a central widget exists.
      */
     void updateSplitterHandles(QSplitter* splitter);
 
     /**
-     * This function returns true if the area is not allowed to resize in the direstion
-     * of the splitter. Otherwise returns true.
+     * If no central widget exists, the widgets resize with the container.
+     * If a central widget exists, the widgets surrounding the central widget
+     * do not resize its height or width.
      */
     bool widgetResizesWithContainer(QWidget* widget);
 
@@ -711,15 +712,14 @@ void DockContainerWidgetPrivate::moveToNewSection(QWidget* Widget, CDockAreaWidg
 //============================================================================
 void DockContainerWidgetPrivate::updateSplitterHandles( QSplitter* splitter )
 {
-    if(DockManager->centralWidget())
+	if (!DockManager->centralWidget() || !splitter)
+	{
+		return;
+	}
+
+	for (int i = 0; i < splitter->count(); ++i)
     {
-        if( splitter )
-        {
-            for( int index = 0; index < splitter->count(); index++ )
-            {
-                splitter->setStretchFactor(index, widgetResizesWithContainer(splitter->widget(index)) ? 1 : 0);
-            }
-        }
+		splitter->setStretchFactor(i, widgetResizesWithContainer(splitter->widget(i)) ? 1 : 0);
     }
 }
 
@@ -727,19 +727,21 @@ void DockContainerWidgetPrivate::updateSplitterHandles( QSplitter* splitter )
 //============================================================================
 bool DockContainerWidgetPrivate::widgetResizesWithContainer(QWidget* widget)
 {
-    if(!DockManager->centralWidget())
+    if (!DockManager->centralWidget())
+    {
         return true;
+    }
 
-    CDockAreaWidget* Area = dynamic_cast< CDockAreaWidget* >( widget );
+    auto Area = qobject_cast<CDockAreaWidget*>(widget);
     if(Area)
     {
         return Area->isCentralWidgetArea();
     }
 
-    CDockSplitter* innerSplitter = dynamic_cast< CDockSplitter* >( widget );
-    if(innerSplitter)
+    auto innerSplitter = qobject_cast<CDockSplitter*>(widget);
+    if (innerSplitter)
     {
-        return innerSplitter->resizeWithContainer();
+        return innerSplitter->isResizingWithContainer();
     }
 
     return false;

src/DockContainerWidget.h

@@ -156,8 +156,8 @@ protected:
     QList<CDockWidget*> dockWidgets() const;
 
     /**
-     * This finction forces the dock container widget to update handles of splitters
-     * based on resize modes of dock widgets aontained in the container.
+     * This function forces the dock container widget to update handles of splitters
+     * based on resize modes of dock widgets contained in the container.
      */
     void updateSplitterHandles(QSplitter* splitter);
 

src/DockManager.cpp

@@ -831,31 +831,38 @@ void CDockManager::loadPerspectives(QSettings& Settings)
 	Settings.endArray();
 }
 
-CDockWidget* CDockManager::centralWidget()
+
+//============================================================================
+CDockWidget* CDockManager::centralWidget() const
 {
     return d->CentralWidget;
 }
 
-//============================================================================
-CDockAreaWidget* CDockManager::setCentralWidget(CDockWidget* widget, CDockWidget* oldCentralWidget, DockWidgetArea oldCentralWidgetArea)
-{
-    oldCentralWidget = d->CentralWidget;
-    if(oldCentralWidget)
-    {
-        addDockWidget(oldCentralWidgetArea, oldCentralWidget);
-    }
 
-    if(widget)
-    {
-        widget->setFeature(CDockWidget::DockWidgetClosable, false);
-        widget->setFeature(CDockWidget::DockWidgetMovable, false);
-        widget->setFeature(CDockWidget::DockWidgetFloatable, false);
-        d->CentralWidget = widget;
-        CDockAreaWidget* CentralArea = addDockWidget(CenterDockWidgetArea, widget);
-        CentralArea->setDockAreaFlag(CDockAreaWidget::eDockAreaFlag::HideSingleWidgetTitleBar, true);
-        return CentralArea;
-    }
-    return nullptr;
+//============================================================================
+CDockAreaWidget* CDockManager::setCentralWidget(CDockWidget* widget)
+{
+	if (!widget)
+	{
+		d->CentralWidget = nullptr;
+		return nullptr;
+	}
+
+	// Setting a new central widget is now allowed if there is alread a central
+	// widget
+	if (d->CentralWidget)
+	{
+		return nullptr;
+	}
+
+
+	widget->setFeature(CDockWidget::DockWidgetClosable, false);
+	widget->setFeature(CDockWidget::DockWidgetMovable, false);
+	widget->setFeature(CDockWidget::DockWidgetFloatable, false);
+	d->CentralWidget = widget;
+	CDockAreaWidget* CentralArea = addDockWidget(CenterDockWidgetArea, widget);
+	CentralArea->setDockAreaFlag(CDockAreaWidget::eDockAreaFlag::HideSingleWidgetTitleBar, true);
+	return CentralArea;
 }
 
 //============================================================================

src/DockManager.h

@@ -381,16 +381,23 @@ public:
     /**
      * This function returns managers central widget or nullptr if no central widget is set.
      */
-    CDockWidget* centralWidget();
+    CDockWidget* centralWidget() const;
 
     /**
-     * Adds dockwidget into the central area and marks it as central widget.
+     * Adds dockwidget widget into the central area and marks it as central widget.
      * If central widget is set, it will be the only dock widget
-     * that will resize with the dock container.
-     * If a central widget does exist, it will be docked to oldCentralWidgetArea
-     * and returned in oldCentralWidget.
+     * that will resize with the dock container. A central widget if not
+     * movable, floatable or closable and the titlebar of the central
+     * dock area is not visible.
+     * If the given widget could be set as central widget, the function returns
+     * the created cok area. If the widget could not be set, because there
+     * is already a central widget, this function returns a nullptr.
+     * To clear the central widget, pass a nullptr to the function.
+     * \retval != 0 The dock area that contains the central widget
+     * \retval nullptr Indicates that the given widget can not be set as central
+     *         widget because there is already a central widget.
      */
-    CDockAreaWidget* setCentralWidget(CDockWidget* widget, CDockWidget* oldCentralWidget = nullptr, DockWidgetArea oldCentralWidgetArea = DockWidgetArea::RightDockWidgetArea);
+    CDockAreaWidget* setCentralWidget(CDockWidget* widget);
 
     /**
 	 * Adds a toggle view action to the the internal view menu.

src/DockSplitter.cpp

@@ -103,16 +103,16 @@ QWidget* CDockSplitter::lastWidget() const
 }
 
 //============================================================================
-bool CDockSplitter::resizeWithContainer()
+bool CDockSplitter::isResizingWithContainer() const
 {
-    QList<CDockAreaWidget *> areas = findChildren<CDockAreaWidget *>();
-
-    for(int i=0; i<areas.size(); i++)
+    for (auto area : findChildren<CDockAreaWidget*>())
     {
-        CDockAreaWidget* area = areas.at(i);
         if(area->isCentralWidgetArea())
+        {
             return true;
+        }
     }
+
     return false;
 }
 

src/DockSplitter.h

@@ -75,7 +75,7 @@ public:
     /**
      * Returns true if the splitter contains central widget of dock manager.
      */
-    bool resizeWithContainer();
+    bool isResizingWithContainer() const;
 }; // class CDockSplitter
 
 } // namespace ads

src/DockWidget.cpp

@@ -463,7 +463,8 @@ void CDockWidget::setMinimumSizeHintMode(eMinimumSizeHintMode Mode)
 }
 
 
-bool CDockWidget::isCentralWidget()
+//============================================================================
+bool CDockWidget::isCentralWidget() const
 {
     return dockManager()->centralWidget() == this;
 }

src/DockWidget.h

@@ -361,9 +361,9 @@ public:
     void setMinimumSizeHintMode(eMinimumSizeHintMode Mode);
 
     /**
-     * Returns true if the dock wisget is set as central widget of it's dock manager
+     * Returns true if the dock widget is set as central widget of it's dock manager
      */
-    bool isCentralWidget();
+    bool isCentralWidget() const;
 
     /**
      * Sets the dock widget icon that is shown in tabs and in toggle view