QmlDesigner: Disable TimelineEditorView when not visible

Change-Id: If67a027c9ad52b2b2fa62df8cf94afdd1c2c49d7
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/components/timelineeditor/timelineview.cpp

@@ -77,6 +77,10 @@ TimelineView::~TimelineView() = default;
 void TimelineView::modelAttached(Model *model)
 {
     AbstractView::modelAttached(model);
+
+    if (!isEnabled())
+        return;
+
     if (m_timelineWidget)
         m_timelineWidget->init();
 }

src/plugins/qmldesigner/components/timelineeditor/timelinewidget.cpp

@@ -537,10 +537,18 @@ void TimelineWidget::setFocus()
 void TimelineWidget::showEvent(QShowEvent *event)
 {
     Q_UNUSED(event)
+
+    m_timelineView->setEnabled(true);
+
+    if (m_timelineView->model())
+        init();
+
     graphicsScene()->setWidth(m_graphicsView->viewport()->width());
     graphicsScene()->invalidateLayout();
     graphicsScene()->invalidate();
     graphicsScene()->onShow();
+
+    QWidget::showEvent(event);
 }
 
 void TimelineWidget::resizeEvent(QResizeEvent *event)
@@ -549,6 +557,12 @@ void TimelineWidget::resizeEvent(QResizeEvent *event)
     graphicsScene()->setWidth(m_graphicsView->viewport()->width());
 }
 
+void TimelineWidget::hideEvent(QHideEvent *event)
+{
+    m_timelineView->setEnabled(false);
+    QWidget::hideEvent(event);
+}
+
 TimelineView *TimelineWidget::timelineView() const
 {
     return m_timelineView;

src/plugins/qmldesigner/components/timelineeditor/timelinewidget.h

@@ -81,6 +81,7 @@ public slots:
 protected:
     void showEvent(QShowEvent *event) override;
     void resizeEvent(QResizeEvent *event) override;
+    void hideEvent(QHideEvent *event) override;
 
 private:
     void connectToolbar();