73     void deviceCoordinateTranslateCaching();

   518 class DeviceEffect : public QGraphicsEffect

   519 {

   520 public:

   521     QRectF boundingRectFor(const QRectF &rect) const

   522     { return rect; }

   523 

   524     void draw(QPainter *painter)

   525     {

   526         QPoint offset;

   527         QPixmap pixmap = sourcePixmap(Qt::DeviceCoordinates, &offset, QGraphicsEffect::NoPad);

   528 

   529         if (pixmap.isNull())

   530             return;

   531 

   532         painter->save();

   533         painter->setWorldTransform(QTransform());

   534         painter->drawPixmap(offset, pixmap);

   535         painter->restore();

   536     }

   537 };

   538 

   539 void tst_QGraphicsEffect::deviceCoordinateTranslateCaching()

   540 {

   541     QGraphicsScene scene;

   542     CustomItem *item = new CustomItem(0, 0, 10, 10);

   543     scene.addItem(item);

   544     scene.setSceneRect(0, 0, 50, 0);

   545 

   546     item->setGraphicsEffect(new DeviceEffect);

   547     item->setPen(Qt::NoPen);

   548     item->setBrush(Qt::red);

   549 

   550     QGraphicsView view(&scene);

   551     view.show();

   552     QTest::qWaitForWindowShown(&view);

   553 

   554     QTRY_VERIFY(item->numRepaints >= 1);

   555     int numRepaints = item->numRepaints;

   556 

   557     item->translate(10, 0);

   558     QTest::qWait(50);

   559 

   560     QVERIFY(item->numRepaints == numRepaints);

   561 }

   562