Added visibilityChanged code

demo/MainWindow.cpp

@@ -317,6 +317,7 @@ void MainWindowPrivate::createContent()
 	for (auto DockWidget : DockManager->dockWidgetsMap())
 	{
 		_this->connect(DockWidget, SIGNAL(viewToggled(bool)), SLOT(onViewToggled(bool)));
+		_this->connect(DockWidget, SIGNAL(visibilityChanged(bool)), SLOT(onViewVisibilityChanged(bool)));
 	}
 }
 
@@ -501,6 +502,19 @@ void CMainWindow::onViewToggled(bool Open)
 }
 
 
+//============================================================================
+void CMainWindow::onViewVisibilityChanged(bool Visible)
+{
+	auto DockWidget = qobject_cast<ads::CDockWidget*>(sender());
+    if (!DockWidget)
+    {
+        return;
+    }
+
+    qDebug() << DockWidget->objectName() << " visibilityChanged(" << Visible << ")";
+}
+
+
 //============================================================================
 void CMainWindow::createEditor()
 {

demo/MainWindow.h

@@ -59,6 +59,7 @@ private slots:
 	void on_actionRestoreState_triggered(bool);
 	void savePerspective();
 	void onViewToggled(bool Open);
+	void onViewVisibilityChanged(bool Visible);
 	void createEditor();
 	void createTable();
 	void onEditorCloseRequested();

src/DockAreaWidget.cpp

@@ -546,6 +546,11 @@ void CDockAreaWidget::internalSetCurrentDockWidget(CDockWidget* DockWidget)
 void CDockAreaWidget::setCurrentIndex(int index)
 {
 	auto TabBar = d->tabBar();
+	/*if (TabBar->currentIndex() == index)
+	{
+		return;
+	}*/
+
 	if (index < 0 || index > (TabBar->count() - 1))
 	{
 		qWarning() << Q_FUNC_INFO << "Invalid index" << index;

src/DockWidget.cpp

@@ -45,6 +45,10 @@
 #include <QToolBar>
 #include <QXmlStreamWriter>
 
+#include <QGuiApplication>
+#include <QScreen>
+#include <QWindow>
+
 #include "DockContainerWidget.h"
 #include "DockAreaWidget.h"
 #include "DockManager.h"
@@ -296,6 +300,7 @@ void CDockWidget::setFeatures(DockWidgetFeatures features)
 		return;
 	}
 	d->Features = features;
+	emit featuresChanged(d->Features);
 	d->TabWidget->onDockWidgetFeaturesChanged();
 }
 
@@ -517,23 +522,50 @@ void CDockWidget::flagAsUnassigned()
 //============================================================================
 bool CDockWidget::event(QEvent *e)
 {
-	if (e->type() == QEvent::WindowTitleChange)
+	switch (e->type())
 	{
-		const auto title = windowTitle();
-		if (d->TabWidget)
-		{
-			d->TabWidget->setText(title);
-		}
-		if (d->ToggleViewAction)
+	case QEvent::Hide:
+		emit visibilityChanged(false);
+		break;
+
+	case QEvent::Show:
 		{
-			d->ToggleViewAction->setText(title);
-		}
-		if (d->DockArea)
+			QPoint parentTopLeft(0, 0);
+			if (isWindow())
+			{
+				if (const QWindow *window = windowHandle())
+					parentTopLeft = window->screen()->availableVirtualGeometry().topLeft();
+				else
+					parentTopLeft = QGuiApplication::primaryScreen()->availableVirtualGeometry().topLeft();
+				std::cout << "QEvent::Show isWindow()" << std::endl;
+			}
+			emit visibilityChanged(geometry().right() >= parentTopLeft.x() && geometry().bottom() >= parentTopLeft.y());
+        }
+        break;
+
+	case QEvent::WindowTitleChange :
 		{
-			d->DockArea->markTitleBarMenuOutdated();//update tabs menu
+			const auto title = windowTitle();
+			if (d->TabWidget)
+			{
+				d->TabWidget->setText(title);
+			}
+			if (d->ToggleViewAction)
+			{
+				d->ToggleViewAction->setText(title);
+			}
+			if (d->DockArea)
+			{
+				d->DockArea->markTitleBarMenuOutdated();//update tabs menu
+			}
+			emit titleChanged(title);
 		}
-		emit titleChanged(title);
+		break;
+
+	default:
+		break;
 	}
+
 	return Super::event(e);
 }
 

src/DockWidget.h

@@ -468,6 +468,19 @@ public slots:
      * This signal is emitted, if close is requested
      */
     void closeRequested();
+
+    /**
+     * This signal is emitted when the dock widget becomes visible (or invisible).
+     * This happens when the widget is hidden or shown, as well as when it is
+     * docked in a tabbed dock area and its tab becomes selected or unselected.
+     */
+    void visibilityChanged(bool visible);
+
+    /**
+     * This signal is emitted when the features property changes.
+     * The features parameter gives the new value of the property.
+     */
+    void featuresChanged(DockWidgetFeatures features);
 }; // class DockWidget
 }
  // namespace ads