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, 8 deletions

diff --git a/examples/widgets/animation/stickman/graphicsview.h b/examples/widgets/animation/stickman/graphicsview.h
index 361fee219d..29f4c6237e 100644
--- a/examples/widgets/animation/stickman/graphicsview.h
+++ b/examples/widgets/animation/stickman/graphicsview.h
@@ -51,24 +51,20 @@
 #ifndef GRAPHICSVIEW_H
 #define GRAPHICSVIEW_H
 
-#include <QtWidgets/QGraphicsView>
+#include <QGraphicsView>
 
-class MainWindow;
 class GraphicsView: public QGraphicsView
 {
     Q_OBJECT
 public:
-    GraphicsView(QWidget *parent = nullptr);
+    using QGraphicsView::QGraphicsView;
 
 protected:
-    void resizeEvent(QResizeEvent *event) override;
-    void keyPressEvent(QKeyEvent *) override;
+    void resizeEvent(QResizeEvent *e) override;
+    void keyPressEvent(QKeyEvent *e) override;
 
 signals:
     void keyPressed(int key);
-
-private:
-    MainWindow *m_editor;
 };
 
 #endif