Refactored, fixed and improved drag hover functionality

src/AutoHideDockContainer.cpp

@@ -660,8 +660,7 @@ bool CAutoHideDockContainer::event(QEvent* event)
 //============================================================================
 void CAutoHideDockContainer::dragLeaveEvent(QDragLeaveEvent*)
 {
-    if (CDockManager::testAutoHideConfigFlag(
-            CDockManager::AutoHideOpenOnDragHover))
+    if (CDockManager::testAutoHideConfigFlag(CDockManager::AutoHideOpenOnDragHover))
     {
         collapseView(true);
     }

src/AutoHideTab.cpp

@@ -34,6 +34,7 @@
 #include <QElapsedTimer>
 #include <QMenu>
 #include <QEvent>
+#include <QTimer>
 
 #include "AutoHideDockContainer.h"
 #include "AutoHideSideBar.h"
@@ -57,7 +58,7 @@ struct AutoHideTabPrivate
     CAutoHideSideBar* SideBar = nullptr;
 	Qt::Orientation Orientation{Qt::Vertical};
 	QElapsedTimer TimeSinceHoverMousePress;
-	QElapsedTimer TimeSinceDragOver;
+	QTimer DragOverTimer;
 	bool MousePressed = false;
 	eDragState DragState = DraggingInactive;
 	QPoint GlobalDragStartMousePosition;
@@ -258,6 +259,11 @@ CAutoHideTab::CAutoHideTab(QWidget* parent) :
     if (CDockManager::testAutoHideConfigFlag(CDockManager::AutoHideOpenOnDragHover)) {
         setAcceptDrops(true);
     }
+
+    d->DragOverTimer.setInterval(CDockManager::configParam(
+    	CDockManager::AutoHideOpenOnDragHoverDelay_ms, 500).toInt());
+    d->DragOverTimer.setSingleShot(true);
+	connect(&d->DragOverTimer, &QTimer::timeout, this, &CAutoHideTab::onDragHoverDelayExpired);
 }
 
 
@@ -498,81 +504,76 @@ void CAutoHideTab::mouseReleaseEvent(QMouseEvent* ev)
 
 
 //============================================================================
-void CAutoHideTab::mouseMoveEvent(QMouseEvent* ev)
+void CAutoHideTab::mouseMoveEvent(QMouseEvent *ev)
 {
-    if (!(ev->buttons() & Qt::LeftButton) || d->isDraggingState(DraggingInactive))
-    {
-    	d->DragState = DraggingInactive;
-        Super::mouseMoveEvent(ev);
-        return;
-    }
-
-    // move floating window
-    if (d->isDraggingState(DraggingFloatingWidget))
-    {
-        d->FloatingWidget->moveFloating();
-        Super::mouseMoveEvent(ev);
-        return;
-    }
-
-    // move tab
-    if (d->isDraggingState(DraggingTab))
-    {
-        // Moving the tab is always allowed because it does not mean moving the
-    	// dock widget around
-    	//d->moveTab(ev);
-    }
-
-    auto MappedPos = mapToParent(ev->pos());
-    bool MouseOutsideBar = (MappedPos.x() < 0) || (MappedPos.x() > parentWidget()->rect().right());
-    // Maybe a fixed drag distance is better here ?
-    int DragDistanceY = qAbs(d->GlobalDragStartMousePosition.y() - internal::globalPositionOf(ev).y());
-    if (DragDistanceY >= CDockManager::startDragDistance() || MouseOutsideBar)
+	if (!(ev->buttons() & Qt::LeftButton)
+	    || d->isDraggingState(DraggingInactive))
 	{
-    	// Floating is only allowed for widgets that are floatable
-		// We can create the drag preview if the widget is movable.
-		auto Features = d->DockWidget->features();
-        if (Features.testFlag(CDockWidget::DockWidgetFloatable) || (Features.testFlag(CDockWidget::DockWidgetMovable)))
-        {
-            d->startFloating();
-        }
-    	return;
+		d->DragState = DraggingInactive;
+		Super::mouseMoveEvent(ev);
+		return;
 	}
 
-    Super::mouseMoveEvent(ev);
+	// move floating window
+	if (d->isDraggingState(DraggingFloatingWidget))
+	{
+		d->FloatingWidget->moveFloating();
+		Super::mouseMoveEvent(ev);
+		return;
+	}
+
+	// move tab
+	if (d->isDraggingState(DraggingTab))
+	{
+		// Moving the tab is always allowed because it does not mean moving the
+		// dock widget around
+		//d->moveTab(ev);
+	}
+
+	auto MappedPos = mapToParent(ev->pos());
+	bool MouseOutsideBar = (MappedPos.x() < 0)
+	    || (MappedPos.x() > parentWidget()->rect().right());
+	// Maybe a fixed drag distance is better here ?
+	int DragDistanceY = qAbs(
+	    d->GlobalDragStartMousePosition.y()
+	        - internal::globalPositionOf(ev).y());
+	if (DragDistanceY >= CDockManager::startDragDistance() || MouseOutsideBar)
+	{
+		// Floating is only allowed for widgets that are floatable
+		// We can create the drag preview if the widget is movable.
+		auto Features = d->DockWidget->features();
+		if (Features.testFlag(CDockWidget::DockWidgetFloatable)
+		    || (Features.testFlag(CDockWidget::DockWidgetMovable)))
+		{
+			d->startFloating();
+		}
+		return;
+	}
+
+	Super::mouseMoveEvent(ev);
 }
 
 //============================================================================
-void CAutoHideTab::dragEnterEvent(QDragEnterEvent* ev) {
-    if (CDockManager::testAutoHideConfigFlag(CDockManager::AutoHideOpenOnDragHover)) {
-        if (!d->TimeSinceDragOver.isValid()) {
-            d->TimeSinceDragOver.restart();
-            ev->accept();
-        }
-        else if (d->TimeSinceDragOver.hasExpired(500)) {
-            ev->accept();
-        }
-    }
+void CAutoHideTab::dragEnterEvent(QDragEnterEvent *ev)
+{
+	Q_UNUSED(ev);
+	if (CDockManager::testAutoHideConfigFlag(CDockManager::AutoHideOpenOnDragHover))
+	{
+		d->DragOverTimer.start();
+		ev->accept();
+	}
 }
 
 //============================================================================
-void CAutoHideTab::dragLeaveEvent(QDragLeaveEvent* ev) {
-    if (CDockManager::testAutoHideConfigFlag(CDockManager::AutoHideOpenOnDragHover)) {
-        d->TimeSinceDragOver.invalidate();
-        d->forwardEventToDockContainer(ev);
-    }
+void CAutoHideTab::dragLeaveEvent(QDragLeaveEvent *ev)
+{
+	Q_UNUSED(ev);
+	if (CDockManager::testAutoHideConfigFlag(CDockManager::AutoHideOpenOnDragHover))
+	{
+		d->DragOverTimer.stop();
+	}
 }
 
-//============================================================================
-void CAutoHideTab::dragMoveEvent(QDragMoveEvent* ev) {
-    if (CDockManager::testAutoHideConfigFlag(CDockManager::AutoHideOpenOnDragHover)
-        && d->TimeSinceDragOver.isValid()
-        && d->TimeSinceDragOver.hasExpired(500)) {
-        d->TimeSinceDragOver.invalidate();
-        d->DockWidget->autoHideDockContainer()->collapseView(false);
-        ev->accept();
-    }
-}
 
 //============================================================================
 void CAutoHideTab::requestCloseDockWidget()
@@ -580,7 +581,6 @@ void CAutoHideTab::requestCloseDockWidget()
 	d->DockWidget->requestCloseDockWidget();
 }
 
-
 //============================================================================
 int CAutoHideTab::tabIndex() const
 {
@@ -593,4 +593,28 @@ int CAutoHideTab::tabIndex() const
 }
 
 
+//============================================================================
+void CAutoHideTab::onDragHoverDelayExpired()
+{
+	static const char* const PropertyId = "ActiveDragOverAutoHideContainer";
+
+	// First we check if there is an active auto hide container that is visible
+	// In this case, we collapse it before we open the new one
+	auto v = d->DockWidget->dockManager()->property(PropertyId);
+	if (v.isValid())
+	{
+		auto ActiveAutoHideContainer = v.value<QPointer<CAutoHideDockContainer>>();
+		if (ActiveAutoHideContainer)
+		{
+			ActiveAutoHideContainer->collapseView(true);
+		}
+	}
+
+	auto AutoHideContainer = d->DockWidget->autoHideDockContainer();
+	AutoHideContainer->collapseView(false);
+	d->DockWidget->dockManager()->setProperty(PropertyId,
+		QVariant::fromValue(QPointer(AutoHideContainer)));
+}
+
+
 }

src/AutoHideTab.h

@@ -67,6 +67,7 @@ private:
 
 private Q_SLOTS:
 	void onAutoHideToActionClicked();
+	void onDragHoverDelayExpired();
 
 protected:
 	void setSideBar(CAutoHideSideBar *SideTabBar);
@@ -78,7 +79,6 @@ protected:
 	virtual void mouseMoveEvent(QMouseEvent* ev) override;
     virtual void dragEnterEvent(QDragEnterEvent* ev) override;
     virtual void dragLeaveEvent(QDragLeaveEvent* ev) override;
-    virtual void dragMoveEvent(QDragMoveEvent* ev) override;
 
 public:
     using Super = CPushButton;