Support tabs at the bottom of dock widgets.

src/DockAreaTitleBar.cpp

@@ -260,10 +260,10 @@ void DockAreaTitleBarPrivate::createAutoHideTitleLabel()
 {
 	AutoHideTitleLabel = new CElidingLabel("");
 	AutoHideTitleLabel->setObjectName("autoHideTitleLabel");
-	// At position 0 is the tab bar - insert behind tab bar
-	Layout->insertWidget(1, AutoHideTitleLabel);
-	AutoHideTitleLabel->setVisible(false); // Default hidden
-	Layout->insertWidget(2 ,new CSpacerWidget(_this));
+	// When the tabs are at the top, they will be at position 0, insert the label behind them, and hide it.
+	Layout->addWidget(AutoHideTitleLabel);
+	AutoHideTitleLabel->setVisible(CDockManager::testConfigFlag(CDockManager::TabsAtBottom));
+	Layout->addWidget(new CSpacerWidget(_this));
 }
 
 
@@ -272,7 +272,9 @@ void DockAreaTitleBarPrivate::createTabBar()
 {
 	TabBar = componentsFactory()->createDockAreaTabBar(DockArea);
     TabBar->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Preferred);
+	if (!CDockManager::testConfigFlag(CDockManager::TabsAtBottom))
 		Layout->addWidget(TabBar);
+
 	_this->connect(TabBar, SIGNAL(tabClosed(int)), SLOT(markTabsMenuOutdated()));
 	_this->connect(TabBar, SIGNAL(tabOpened(int)), SLOT(markTabsMenuOutdated()));
 	_this->connect(TabBar, SIGNAL(tabInserted(int)), SLOT(markTabsMenuOutdated()));
@@ -351,8 +353,8 @@ CDockAreaTitleBar::CDockAreaTitleBar(CDockAreaWidget* parent) :
 	setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 
 	d->createTabBar();
-	d->createButtons();
 	d->createAutoHideTitleLabel();
+	d->createButtons();
 
     setFocusPolicy(Qt::NoFocus);
 }
@@ -900,8 +902,11 @@ QString CDockAreaTitleBar::titleBarButtonToolTip(TitleBarButton Button) const
 //============================================================================
 void CDockAreaTitleBar::showAutoHideControls(bool Show)
 {
-	d->TabBar->setVisible(!Show); // Auto hide toolbar never has tabs
+	if (Show)
+		d->TabBar->setVisible(false); // Auto hide toolbar never has tabs
+
 	d->MinimizeButton->setVisible(Show);
+	if (!CDockManager::testConfigFlag(CDockManager::TabsAtBottom))
 		d->AutoHideTitleLabel->setVisible(Show);
 }
 

src/DockAreaWidget.cpp

@@ -179,14 +179,17 @@ public:
 			parent->setUpdatesEnabled(false);
 		}
 
+		if (m_CurrentWidget)
+		{
 			auto LayoutItem = m_ParentLayout->takeAt(1);
 			if (LayoutItem)
 			{
 				LayoutItem->widget()->setParent(nullptr);
 			}
 			delete LayoutItem;
+		}
 
-		m_ParentLayout->addWidget(next);
+		m_ParentLayout->insertWidget(1, next);
 		if (prev)
 		{
 			prev->hide();
@@ -362,6 +365,14 @@ void DockAreaWidgetPrivate::createTitleBar()
 {
 	TitleBar = componentsFactory()->createDockAreaTitleBar(_this);
 	Layout->addWidget(TitleBar);
+	if (CDockManager::testConfigFlag(CDockManager::TabsAtBottom))
+	{
+		// Title bar will be index 0, container widgets will be index 1,
+		// so tabs will always be at the end of the layout.
+		Layout->addWidget(tabBar());
+		tabBar()->setVisible(CDockManager::testConfigFlag(CDockManager::AlwaysShowTabs));
+	}
+
 	QObject::connect(tabBar(), &CDockAreaTabBar::tabCloseRequested, _this, &CDockAreaWidget::onTabCloseRequested);
 	QObject::connect(TitleBar, &CDockAreaTitleBar::tabBarClicked, _this, &CDockAreaWidget::setCurrentIndex);
 	QObject::connect(tabBar(), &CDockAreaTabBar::tabMoved, _this, &CDockAreaWidget::reorderDockWidget);
@@ -726,6 +737,7 @@ void CDockAreaWidget::setCurrentIndex(int index)
     TabBar->setCurrentIndex(index);
 	d->ContentsLayout->setCurrentIndex(index);
 	d->ContentsLayout->currentWidget()->show();
+	d->TitleBar->autoHideTitleLabel()->setText(d->ContentsLayout->currentWidget()->windowTitle());
 	Q_EMIT currentChanged(index);
 }
 
@@ -889,6 +901,8 @@ void CDockAreaWidget::updateTitleBarVisibility()
             }
         }
 		d->TitleBar->setVisible(!Hidden);
+		if (CDockManager::testConfigFlag(CDockManager::TabsAtBottom))
+			d->TitleBar->tabBar()->setVisible(openDockWidgetsCount() > 1);
     }
 
 	if (isAutoHideFeatureEnabled())

src/DockManager.h

@@ -216,6 +216,7 @@ public:
 		DisableTabTextEliding =      0x4000000, //! Set this flag to disable eliding of tab texts in dock area tabs
 		ShowTabTextOnlyForActiveTab =0x8000000, //! Set this flag to show label texts in dock area tabs only for active tabs
 		DoubleClickUndocksWidget = 0x10000000, //!< If the flag is set, a double click on a tab undocks the widget
+		TabsAtBottom = 0x20000000, //!< If the flag is set, tabs will be shown at the bottom instead of in the title bar.
 
 
         DefaultDockAreaButtons = DockAreaHasCloseButton

src/stylesheets/default.css

@@ -82,6 +82,10 @@ ads--CDockWidgetTab[activeTab="true"] QLabel {
 	color: palette(foreground);
 }
 
+#autoHideTitleLabel {
+	padding-left: 4px;
+	color: palette(foreground);
+}
 
 #tabCloseButton {
         margin-top: 2px;
@@ -278,7 +282,7 @@ ads--CAutoHideDockContainer ads--CDockAreaWidget[focused="true"] ads--CDockAreaT
 }
 
 
-#autoHideTitleLabel {
+ads--CAutoHideDockContainer #autoHideTitleLabel {
 	padding-left: 4px;
 	color: palette(light);
 }