Updated CFloatingDockContainer::closeEvent() function to delete all dock widgets with DockWidgetDeleteOnClose flag set

src/DockContainerWidget.cpp

@@ -1625,6 +1625,22 @@ QList<CDockAreaWidget*> CDockContainerWidget::openedDockAreas() const
 }
 
 
+//============================================================================
+QList<CDockWidget*> CDockContainerWidget::openedDockWidgets() const
+{
+	QList<CDockWidget*> DockWidgetList;
+	for (auto DockArea : d->DockAreas)
+	{
+		if (!DockArea->isHidden())
+		{
+			DockWidgetList.append(DockArea->openedDockWidgets());
+		}
+	}
+
+	return DockWidgetList;
+}
+
+
 //============================================================================
 bool CDockContainerWidget::hasOpenDockAreas() const
 {

src/DockContainerWidget.h

@@ -216,6 +216,11 @@ public:
 	 */
 	QList<CDockAreaWidget*> openedDockAreas() const;
 
+	/**
+	 * Returns a list for all open dock widgets in all open dock areas
+	 */
+	QList<CDockWidget*> openedDockWidgets() const;
+
 	/**
 	 * This function returns true, if the container has open dock areas.
 	 * This functions is a little bit faster than calling openedDockAreas().isEmpty()

src/FloatingDockContainer.cpp

@@ -802,29 +802,33 @@ void CFloatingDockContainer::closeEvent(QCloseEvent *event)
 	ADS_PRINT("CFloatingDockContainer closeEvent");
 	d->setState(DraggingInactive);
 	event->ignore();
-
+	if (!isClosable())
-	if (isClosable())
 	{
-		auto TopLevelDockWidget = topLevelDockWidget();
+		return;
-		if (TopLevelDockWidget && TopLevelDockWidget->features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
-		{
-			if (!TopLevelDockWidget->closeDockWidgetInternal())
-			{
-				return;
-			}
-		}
-
-		// In Qt version after 5.9.2 there seems to be a bug that causes the
-		// QWidget::event() function to not receive any NonClientArea mouse
-		// events anymore after a close/show cycle. The bug is reported here:
-		// https://bugreports.qt.io/browse/QTBUG-73295
-		// The following code is a workaround for Qt versions > 5.9.2 that seems
-		// to work
-		// Starting from Qt version 5.12.2 this seems to work again. But
-		// now the QEvent::NonClientAreaMouseButtonPress function returns always
-		// Qt::RightButton even if the left button was pressed
-        this->hide();
 	}
+
+	for (auto DockWidget : d->DockContainer->openedDockWidgets())
+	{
+		if (DockWidget->features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
+		{
+			DockWidget->closeDockWidgetInternal();
+		}
+		else
+		{
+			DockWidget->toggleView(false);
+		}
+	}
+
+	// In Qt version after 5.9.2 there seems to be a bug that causes the
+	// QWidget::event() function to not receive any NonClientArea mouse
+	// events anymore after a close/show cycle. The bug is reported here:
+	// https://bugreports.qt.io/browse/QTBUG-73295
+	// The following code is a workaround for Qt versions > 5.9.2 that seems
+	// to work
+	// Starting from Qt version 5.12.2 this seems to work again. But
+	// now the QEvent::NonClientAreaMouseButtonPress function returns always
+	// Qt::RightButton even if the left button was pressed
+	this->hide();
 }
 
 //============================================================================