49 #include <QtGui/qgraphicswidget.h>

    76     void dropShadowClipping();

    77     void childrenVisibilityShouldInvalidateCache();

   515     QTRY_VERIFY(effect->repaints >= 1);

   597 void tst_QGraphicsEffect::dropShadowClipping()

   598 {

   599     QImage img(128, 128, QImage::Format_ARGB32_Premultiplied);

   600     img.fill(0xffffffff);

   601 

   602     QGraphicsScene scene;

   603     QGraphicsRectItem *item = new QGraphicsRectItem(-5, -500, 10, 1000);

   604     item->setGraphicsEffect(new QGraphicsDropShadowEffect);

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

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

   607 

   608     scene.addItem(item);

   609 

   610     QPainter p(&img);

   611     scene.render(&p, img.rect(), QRect(-64, -64, 128, 128));

   612     p.end();

   613 

   614     for (int y = 1; y < img.height(); ++y)

   615         for (int x = 0; x < img.width(); ++x)

   616             QCOMPARE(img.pixel(x, y), img.pixel(x, y-1));

   617 }

   618 

   619 class MyGraphicsItem : public QGraphicsWidget

   620 {

   621 public:

   622     MyGraphicsItem(QGraphicsItem *parent = 0) :

   623             QGraphicsWidget(parent), nbPaint(0)

   624     {}

   625     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)

   626     {

   627         nbPaint++;

   628         QGraphicsWidget::paint(painter, option, widget);

   629     }

   630     int nbPaint;

   631 };

   632 

   633 void tst_QGraphicsEffect::childrenVisibilityShouldInvalidateCache()

   634 {

   635     QGraphicsScene scene;

   636     MyGraphicsItem parent;

   637     parent.resize(200, 200);

   638     QGraphicsWidget child(&parent);

   639     child.resize(200, 200);

   640     child.setVisible(false);

   641     scene.addItem(&parent);

   642     QGraphicsView view(&scene);

   643     view.show();

   644     QApplication::setActiveWindow(&view);

   645     QTest::qWaitForWindowShown(&view);

   646     QTRY_COMPARE(parent.nbPaint, 1);

   647     //we set an effect on the parent

   648     parent.setGraphicsEffect(new QGraphicsDropShadowEffect(&parent));

   649     //flush the events

   650     QApplication::processEvents();

   651     //new effect applied->repaint

   652     QCOMPARE(parent.nbPaint, 2);

   653     child.setVisible(true);

   654     //flush the events

   655     QApplication::processEvents();

   656     //a new child appears we need to redraw the effect.

   657     QCOMPARE(parent.nbPaint, 3);

   658 }

   659