Fixed #509 - Implemented support for restoring maximized state of floating widgets on Windows

src/DockManager.cpp

@@ -47,6 +47,7 @@
 #include <QMenu>
 #include <QApplication>
 #include <QWindow>
+#include <QWindowStateChangeEvent>
 
 #include "FloatingDockContainer.h"
 #include "DockOverlay.h"
@@ -116,6 +117,7 @@ struct DockManagerPrivate
 	QVector<CFloatingDockContainer*> UninitializedFloatingWidgets;
 	CDockFocusController* FocusController = nullptr;
     CDockWidget* CentralWidget = nullptr;
+    bool IsLeavingMinimized = false;
 
 	/**
 	 * Private data constructor
@@ -510,9 +512,10 @@ CDockManager::CDockManager(QWidget *parent) :
 		d->FocusController = new CDockFocusController(this);
 	}
 
-#if defined(Q_OS_UNIX) && !defined(Q_OS_MACOS)
+
 	window()->installEventFilter(this);
 
+#if defined(Q_OS_UNIX) && !defined(Q_OS_MACOS)
     connect(qApp, &QApplication::focusWindowChanged, [](QWindow* focusWindow)
     {
         // bring modal dialogs to foreground to ensure that they are in front of any
@@ -629,8 +632,39 @@ bool CDockManager::eventFilter(QObject *obj, QEvent *e)
 	}
 	return Super::eventFilter(obj, e);
 }
+#else
+//============================================================================
+bool CDockManager::eventFilter(QObject *obj, QEvent *e)
+{
+	if (e->type() == QEvent::WindowStateChange)
+	{
+		QWindowStateChangeEvent* ev = static_cast<QWindowStateChangeEvent*>(e);
+		if (ev->oldState().testFlag(Qt::WindowMinimized))
+		{
+			d->IsLeavingMinimized = true;
+			QMetaObject::invokeMethod(this, "endLeavingMinimizedState", Qt::QueuedConnection);
+		}
+	}
+	return Super::eventFilter(obj, e);
+}
 #endif
 
+
+//============================================================================
+void CDockManager::endLeavingMinimizedState()
+{
+	d->IsLeavingMinimized = false;
+	this->activateWindow();
+}
+
+
+//============================================================================
+bool CDockManager::isLeavingMinimizedState() const
+{
+	return d->IsLeavingMinimized;
+}
+
+
 //============================================================================
 void CDockManager::registerFloatingWidget(CFloatingDockContainer* FloatingWidget)
 {

src/DockManager.h

@@ -88,6 +88,12 @@ private:
 	friend class CAutoHideDockContainer;
 	friend CAutoHideSideBar;
 
+public Q_SLOTS:
+	/**
+	 * Ends the isRestoringFromMinimizedState
+	 */
+	void endLeavingMinimizedState();
+
 
 protected:
 	/**
@@ -539,6 +545,15 @@ public:
 	 */
 	bool isRestoringState() const;
 
+	/**
+	 * This function returns true, if the DockManager window is restoring from
+	 * minimized state.
+	 * The DockManager is in this state starting from the QWindowStateChangeEvent
+	 * that signals the state change from minimized to normal until
+	 * endLeavingMinimizedState() function is called.
+	 */
+	bool isLeavingMinimizedState() const;
+
 	/**
 	 * The distance the user needs to move the mouse with the left button
 	 * hold down before a dock widget start floating
@@ -560,9 +575,7 @@ public:
 		widget->setFocus(Qt::OtherFocusReason);
 	}
 
-#if defined(Q_OS_UNIX) && !defined(Q_OS_MACOS)
 	bool eventFilter(QObject *obj, QEvent *e) override;
-#endif
 
 	/**
 	 * Returns the dock widget that has focus style in the ui or a nullptr if

src/FloatingDockContainer.cpp

@@ -763,7 +763,10 @@ CDockContainerWidget* CFloatingDockContainer::dockContainer() const
 void CFloatingDockContainer::changeEvent(QEvent *event)
 {
 	Super::changeEvent(event);
-	if ((event->type() == QEvent::ActivationChange) && isActiveWindow())
+	switch (event->type())
+	{
+	case QEvent::ActivationChange:
+		if (isActiveWindow())
 		{
 			ADS_PRINT("FloatingWidget::changeEvent QEvent::ActivationChange ");
 			d->zOrderIndex = ++zOrderCounter;
@@ -776,6 +779,28 @@ void CFloatingDockContainer::changeEvent(QEvent *event)
 			}
 #endif
 		}
+		break;
+
+	case QEvent::WindowStateChange:
+	    // If the DockManager window is restored from minimized on Windows
+		// then the FloatingWidgets are not properly restored to maximized but
+		// to normal state.
+		// We simply check here, if the FloatingWidget was maximized before
+		// and if the DockManager is just leaving the minimized state. In this
+		// case, we restore the maximized state of this floating widget
+		if (d->DockManager->isLeavingMinimizedState())
+		{
+			QWindowStateChangeEvent* ev = static_cast<QWindowStateChangeEvent*>(event);
+			if (ev->oldState().testFlag(Qt::WindowMaximized))
+			{
+				this->showMaximized();
+			}
+		}
+		break;
+
+	default:
+		break; // do nothing
+	}
 }
 
 
@@ -1337,19 +1362,6 @@ bool CFloatingDockContainer::hasNativeTitleBar()
 }
 #endif
 
-
-//============================================================================
-bool CFloatingDockContainer::event(QEvent *e)
-{
-	qDebug() << "CFloatingDockContainer::event: " << e;
-	if (e->type() == QEvent::WindowStateChange)
-	{
-		QWindowStateChangeEvent* ev = static_cast<QWindowStateChangeEvent*>(e);
-		qDebug() << "WindowStateChange " << ev->oldState() << " -> " << windowState();
-		qDebug() << "isActiveWindow " << isActiveWindow();
-	}
-	return Super::event(e);
-}
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/FloatingDockContainer.h

@@ -298,8 +298,6 @@ public:
 	 */
 	bool hasNativeTitleBar();
 #endif
-
-	virtual bool event(QEvent *e) override;
 }; // class FloatingDockContainer
 }
  // namespace ads