Added minimumSizeHint function to DockWidget to prevent jumping of the height of a dock area when switching between dock widgets, fixed use of findParent function in DockWidget - non current dock widgets do not have a parent so this function will fail

demo/MainWindow.cpp

@@ -182,7 +182,7 @@ void MainWindowPrivate::createContent()
 	ToolBar->addAction(ui.actionRestoreState);
 	DockManager->addDockWidget(ads::BottomDockWidgetArea, FileSystemWidget);
 
-	/*FileSystemWidget = createFileSystemTreeDockWidget(ViewMenu);
+	FileSystemWidget = createFileSystemTreeDockWidget(ViewMenu);
 	ToolBar = FileSystemWidget->toolBar();
 	ToolBar->addAction(ui.actionSaveState);
 	ToolBar->addAction(ui.actionRestoreState);
@@ -197,7 +197,7 @@ void MainWindowPrivate::createContent()
 	DockManager->addDockWidget(ads::TopDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
 	auto BottomDockArea = DockManager->addDockWidget(ads::BottomDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
 	DockManager->addDockWidget(ads::RightDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
-	DockManager->addDockWidget(ads::CenterDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), BottomDockArea);*/
+	DockManager->addDockWidget(ads::CenterDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), BottomDockArea);
 }
 
 

src/DockAreaTitleBar.cpp

@@ -17,6 +17,7 @@
 #include <QScrollArea>
 #include <QMouseEvent>
 #include <QDebug>
+#include <QStyleOptionButton>
 
 #include "FloatingDockContainer.h"
 #include "DockAreaWidget.h"
@@ -149,7 +150,6 @@ CDockAreaTabBar* CDockAreaTitleBar::tabBar() const
 //============================================================================
 void CDockAreaTitleBar::markTabsMenuOutdated()
 {
-	qDebug() << "CDockAreaTitleBar::markTabsMenuOutdated()";
 	d->MenuOutdated = true;
 }
 

src/DockAreaWidget.cpp

@@ -291,6 +291,8 @@ void DockAreaWidgetPrivate::createTitleBar()
 		SLOT(onTabCloseRequested(int)));
 	_this->connect(tabBar(), SIGNAL(tabBarClicked(int)),
 		SLOT(setCurrentIndex(int)));
+	_this->connect(tabBar(), SIGNAL(tabMoved(int, int)),
+		SLOT(reorderDockWidget(int, int)));
 }
 
 
@@ -480,7 +482,6 @@ void CDockAreaWidget::setCurrentDockWidget(CDockWidget* DockWidget)
 //============================================================================
 void CDockAreaWidget::setCurrentIndex(int index)
 {
-	std::cout << "CDockAreaWidget::setCurrentIndex " << index << std::endl;
 	auto TabBar = d->tabBar();
 	if (index < 0 || index > (TabBar->count() - 1))
 	{
@@ -583,6 +584,7 @@ CDockWidget* CDockAreaWidget::dockWidget(int Index) const
 //============================================================================
 void CDockAreaWidget::reorderDockWidget(int fromIndex, int toIndex)
 {
+	qDebug() << "CDockAreaWidget::reorderDockWidget";
 	if (fromIndex >= d->ContentsLayout->count() || fromIndex < 0
      || toIndex >= d->ContentsLayout->count() || toIndex < 0 || fromIndex == toIndex)
 	{
@@ -658,7 +660,7 @@ CDockWidget* CDockAreaWidget::nextOpenDockWidget(CDockWidget* DockWidget) const
 //============================================================================
 CDockWidget::DockWidgetFeatures CDockAreaWidget::features() const
 {
-	CDockWidget::DockWidgetFeatures Features;
+	CDockWidget::DockWidgetFeatures Features(CDockWidget::AllDockWidgetFeatures);
 	for (const auto DockWidget : dockWidgets())
 	{
 		Features &= DockWidget->features();
@@ -667,6 +669,20 @@ CDockWidget::DockWidgetFeatures CDockAreaWidget::features() const
 	return Features;
 }
 
+
+//============================================================================
+void CDockAreaWidget::setVisible(bool visible)
+{
+	Super::setVisible(visible);
+	QString FirstDockWidgetLabel;
+	if (dockWidgetsCount())
+	{
+		FirstDockWidgetLabel = dockWidget(0)->windowTitle();
+	}
+	qDebug() << "CDockAreaWidget::setVisible " << visible << " " << FirstDockWidgetLabel
+		<< " count: " << dockWidgetsCount() << " open count: " << openDockWidgetsCount();
+}
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockAreaWidget.h

@@ -129,6 +129,8 @@ protected:
 	void updateTabBarVisibility();
 
 public:
+	using Super = QFrame;
+
 	/**
 	 * Default Constructor
 	 */
@@ -223,6 +225,11 @@ public slots:
 	 */
 	void setCurrentIndex(int index);
 
+	/**
+	 * This function is required for debugging purposes
+	 */
+	virtual void setVisible(bool visible) override;
+
 signals:
 	/**
 	 * This signal is emitted when user clicks on a tab at an index.

src/DockContainerWidget.cpp

@@ -1156,7 +1156,7 @@ QList<CDockWidget*> CDockContainerWidget::dockWidgets() const
 //============================================================================
 CDockWidget::DockWidgetFeatures CDockContainerWidget::features() const
 {
-	CDockWidget::DockWidgetFeatures Features;
+	CDockWidget::DockWidgetFeatures Features(CDockWidget::AllDockWidgetFeatures);
 	for (const auto DockArea : d->DockAreas)
 	{
 		Features &= DockArea->features();

src/DockManager.cpp

@@ -252,6 +252,7 @@ bool DockManagerPrivate::restoreState(const QByteArray &state, int version)
     	}
     }
 
+
     // Now all dock areas are properly restored and we setup the index of
     // The dock areas because the previous toggleView() action has changed
     // the dock area index
@@ -278,6 +279,7 @@ bool DockManagerPrivate::restoreState(const QByteArray &state, int version)
     	}
     }
 
+
     // Finally we need to send the topLevelChanged() signals for all dock
     // widgets if top level changed
     for (auto DockContainer : Containers)

src/DockWidget.cpp

@@ -133,7 +133,7 @@ void DockWidgetPrivate::showDockWidget()
 		DockArea->show();
 		DockArea->setCurrentDockWidget(_this);
 		TabWidget->show();
-		QSplitter* Splitter = internal::findParent<QSplitter*>(_this);
+		QSplitter* Splitter = internal::findParent<QSplitter*>(DockArea);
 		while (Splitter && !Splitter->isVisible())
 		{
 			Splitter->show();
@@ -666,6 +666,13 @@ void CDockWidget::setClosedState(bool Closed)
 	d->Closed = Closed;
 }
 
+
+//============================================================================
+QSize CDockWidget::minimumSizeHint() const
+{
+	return QSize(60, 40);
+}
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockWidget.h

@@ -209,6 +209,11 @@ public:
 	 */
 	virtual ~CDockWidget();
 
+	/**
+	 * We return a fixed minimum size hint for all dock widgets
+	 */
+	virtual QSize minimumSizeHint() const override;
+
 	/**
 	 * Sets the widget for the dock widget to widget.
 	 */

src/DockWidgetTab.cpp

@@ -398,10 +398,10 @@ void CDockWidgetTab::mouseDoubleClickEvent(QMouseEvent *event)
 //============================================================================
 void CDockWidgetTab::setVisible(bool visible)
 {
-	if (!visible)
+	/*if (!visible)
 	{
 		qDebug() << "CDockWidgetTab::setVisible " << visible;
-	}
+	}*/
 	Super::setVisible(visible);
 }
 

src/ads_globals.h

@@ -97,6 +97,10 @@ CDockInsertParam dockAreaInsertParameters(DockWidgetArea Area);
  * Searches for the parent widget of the given type.
  * Returns the parent widget of the given widget or 0 if the widget is not
  * child of any widget of type T
+ *
+ * It is not safe to use this function in in CDockWidget because only
+ * the current dock widget has a parent. All dock widgets that are not the
+ * current dock widget in a dock area have no parent.
  */
 template <class T>
 T findParent(const QWidget* w)