Add QQuickWidget::setClearColor()

And make qquickviewcomparison able to demonstrate how to create a
partially transparent QQuickWidget.

Avoid also recreating the QQuickView/QQuickWidget multiple times
when switching between the radio buttons.

[ChangeLog] Added QQuickWidget::setClearColor() in order to support
semi-transparent QQuickWidgets.

Change-Id: I319ad4afbe909530274d09f2a7fcff23730d6ebd
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/examples/quick/quickwidgets/qquickviewcomparison/mainwindow.h b/examples/quick/quickwidgets/qquickviewcomparison/mainwindow.h
index c7bd514d81..c6df4c9e54 100644
--- a/examples/quick/quickwidgets/qquickviewcomparison/mainwindow.h
+++ b/examples/quick/quickwidgets/qquickviewcomparison/mainwindow.h
@@ -57,11 +57,13 @@ public:
 
 protected:
     void resizeEvent(QResizeEvent*);
+
 private slots:
     void updateView();
     void onStatusChangedView(QQuickView::Status status);
     void onStatusChangedWidget(QQuickWidget::Status status);
     void onSceneGraphError(QQuickWindow::SceneGraphError error, const QString &message);
+    void onTransparentChanged(bool enabled);
 
 private:
     void switchTo(QWidget *view);
@@ -75,6 +77,18 @@ private:
     QObject *m_currentRootObject;
     QLabel *m_overlayLabel;
     QCheckBox *m_checkboxOverlayVisible;
+
+    enum State {
+        Unknown,
+        UseWidget,
+        UseWindow
+    } m_state;
+
+    QSurfaceFormat m_format;
+
+    QCheckBox *m_checkboxTransparent;
+
+    bool m_transparent;
 };
 
 #endif