Properly handle dragging of dock widget into DockWidgetTabBar and AutoHideSideBar

src/AutoHideSideBar.cpp

@@ -196,6 +196,7 @@ void CAutoHideSideBar::insertTab(int Index, CAutoHideTab* SideTab)
 {
     SideTab->setSideBar(this);
 	SideTab->installEventFilter(this);
+	// Default insertion is append
     if (Index < 0)
     {
     	d->TabsLayout->insertWidget(d->TabsLayout->count() - 1, SideTab);
@@ -451,7 +452,7 @@ int CAutoHideSideBar::tabAt(const QPoint& Pos) const
 {
 	if (!isVisible())
 	{
-		return InvalidTabIndex;
+		return TabInvalidIndex;
 	}
 
 	if (orientation() == Qt::Horizontal)
@@ -486,9 +487,9 @@ int CAutoHideSideBar::tabAt(const QPoint& Pos) const
 int CAutoHideSideBar::tabInsertIndexAt(const QPoint& Pos) const
 {
 	int Index = tabAt(Pos);
-	if (Index == InvalidTabIndex)
+	if (Index == TabInvalidIndex)
 	{
-		return Append;
+		return TabDefaultInsertIndex;
 	}
 	else
 	{

src/AutoHideSideBar.h

@@ -84,8 +84,6 @@ protected:
 
 public:
     using Super = QScrollArea;
-    static constexpr int Append = -1;
-    static constexpr int InvalidTabIndex = -2;
 
 	/**
 	 * Default Constructor
@@ -119,7 +117,7 @@ public:
 	 * If the AutoHideWidget is in another sidebar, then it will be removed
 	 * from this sidebar.
 	 */
-	void addAutoHideWidget(CAutoHideDockContainer* AutoHideWidget, int Index = Append);
+	void addAutoHideWidget(CAutoHideDockContainer* AutoHideWidget, int Index = TabDefaultInsertIndex);
 
 	/**
 	 * Returns orientation of side tab.

src/DockAreaTabBar.cpp

@@ -510,7 +510,7 @@ int CDockAreaTabBar::tabAt(const QPoint& Pos) const
 {
 	if (!isVisible())
 	{
-		return -2;
+		return TabInvalidIndex;
 	}
 
 	if (Pos.x() < tab(0)->geometry().x())
@@ -529,6 +529,21 @@ int CDockAreaTabBar::tabAt(const QPoint& Pos) const
 	return count();
 }
 
+
+//===========================================================================
+int CDockAreaTabBar::tabInsertIndexAt(const QPoint& Pos) const
+{
+	int Index = tabAt(Pos);
+	if (Index == TabInvalidIndex)
+	{
+		return TabDefaultInsertIndex;
+	}
+	else
+	{
+		return (Index < 0) ? 0 : Index;
+	}
+}
+
 } // namespace ads
 
 

src/DockAreaTabBar.h

@@ -121,6 +121,11 @@ public:
 	 */
 	int tabAt(const QPoint& Pos) const;
 
+	/**
+	 * Returns the tab insertion index for the given mouse cursor position
+	 */
+	int tabInsertIndexAt(const QPoint& Pos) const;
+
 	/**
 	 * Filters the tab widget events
 	 */

src/DockContainerWidget.cpp

@@ -190,20 +190,20 @@ public:
 	 * Creates a new tab for a widget dropped into the center of a section
 	 */
 	void dropIntoCenterOfSection(CFloatingDockContainer* FloatingWidget,
-		CDockAreaWidget* TargetArea, int TabIndex = -2);
+		CDockAreaWidget* TargetArea, int TabIndex = 0);
 
 	/**
 	 * Drop floating widget into dock area
 	 */
 	void dropIntoSection(CFloatingDockContainer* FloatingWidget,
-		CDockAreaWidget* TargetArea, DockWidgetArea area, int TabIndex = -2);
+		CDockAreaWidget* TargetArea, DockWidgetArea area, int TabIndex = 0);
 
 	/**
 	 * Moves the dock widget or dock area given in Widget parameter to a
 	 * new dock widget area
 	 */
 	void moveToNewSection(QWidget* Widget, CDockAreaWidget* TargetArea, DockWidgetArea area,
-		int TabIndex = -2);
+		int TabIndex = 0);
 
 	/**
 	 * Moves the dock widget or dock area given in Widget parameter to a
@@ -214,13 +214,13 @@ public:
 	/**
 	 * Creates a new tab for a widget dropped into the center of a section
 	 */
-	void moveIntoCenterOfSection(QWidget* Widget, CDockAreaWidget* TargetArea, int TabIndex = -2);
+	void moveIntoCenterOfSection(QWidget* Widget, CDockAreaWidget* TargetArea, int TabIndex = 0);
 
 	/**
 	 * Moves the dock widget or dock area given in Widget parameter to
 	 * a auto hide sidebar area
 	 */
-	void moveToAutoHideSideBar(QWidget* Widget, DockWidgetArea area, int TabIndex = -2);
+	void moveToAutoHideSideBar(QWidget* Widget, DockWidgetArea area, int TabIndex = TabDefaultInsertIndex);
 
 
 	/**
@@ -543,7 +543,7 @@ void DockContainerWidgetPrivate::dropIntoCenterOfSection(
 	auto NewDockWidgets = FloatingContainer->dockWidgets();
 	auto TopLevelDockArea = FloatingContainer->topLevelDockArea();
 	int NewCurrentIndex = -1;
-	TabIndex = (TabIndex < 0) ? 0 : TabIndex;
+	TabIndex = qMax(0, TabIndex);
 
 	// If the floating widget contains only one single dock are, then the
 	// current dock widget of the dock area will also be the future current
@@ -675,7 +675,7 @@ void DockContainerWidgetPrivate::moveIntoCenterOfSection(QWidget* Widget, CDockA
 	auto DroppedDockWidget = qobject_cast<CDockWidget*>(Widget);
 	auto DroppedArea = qobject_cast<CDockAreaWidget*>(Widget);
 
-	TabIndex = (TabIndex < 0) ? 0 : TabIndex;
+	TabIndex = qMax(0, TabIndex);
 	if (DroppedDockWidget)
 	{
 		CDockAreaWidget* OldDockArea = DroppedDockWidget->dockAreaWidget();
@@ -1493,7 +1493,6 @@ CAutoHideDockContainer* CDockContainerWidget::createAndSetupAutoHideContainer(
         DockWidget->setDockManager(d->DockManager); // Auto hide Dock Container needs a valid dock manager
 	}
 
-	qDebug() << "CDockContainerWidget::createAndSetupAutoHideContainer TabIndex: " << TabIndex;
 	return autoHideSideBar(area)->insertDockWidget(TabIndex, DockWidget);
 }
 

src/DockOverlay.cpp

@@ -520,7 +520,7 @@ DockWidgetArea CDockOverlay::dropAreaUnderCursor() const
 	 && DockArea->titleBarGeometry().contains(DockArea->mapFromGlobal(CursorPos)))
 	{
 		auto TabBar = DockArea->titleBar()->tabBar();
-		d->TabIndex = TabBar->tabAt(TabBar->mapFromGlobal(CursorPos));
+		d->TabIndex = TabBar->tabInsertIndexAt(TabBar->mapFromGlobal(CursorPos));
 		return CenterDockWidgetArea;
 	}
 

src/ads_globals.h

@@ -95,6 +95,13 @@ enum DockWidgetArea
 Q_DECLARE_FLAGS(DockWidgetAreas, DockWidgetArea)
 
 
+enum eTabIndex
+{
+	TabDefaultInsertIndex = -1,
+	TabInvalidIndex = -2
+};
+
+
 enum TitleBarButton
 {
 	TitleBarButtonTabsMenu,