Cleanup QtWidgets animation examples

Cleanup the QtWidgets animation examples:
 - use nullptr
 - use normalized includes, remove unused includes
 - fix style
 - fix crash of sub-attaq when the game ended (error during range-based
   for loop porting)
 - don't use keyword 'final' for a variable name

Change-Id: Id23be8ff8b1b310da005d13c052fe547f6a0d63a
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 4 insertions, 4 deletions

diff --git a/examples/widgets/animation/stickman/rectbutton.h b/examples/widgets/animation/stickman/rectbutton.h
index ab47bad0f7..ee6cd3f530 100644
--- a/examples/widgets/animation/stickman/rectbutton.h
+++ b/examples/widgets/animation/stickman/rectbutton.h
@@ -57,19 +57,19 @@ class RectButton : public QGraphicsObject
 {
     Q_OBJECT
 public:
-    RectButton(QString buttonText);
-    ~RectButton();
+    RectButton(const QString &buttonText);
 
     QRectF boundingRect() const override;
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
 
 protected:
-    QString m_ButtonText;
-
     void mousePressEvent (QGraphicsSceneMouseEvent *event) override;
 
 signals:
     void clicked();
+
+private:
+    QString m_ButtonText;
 };
 
 #endif // RECTBUTTON_H