void tst_QGraphicsEffect::draw()
{
QGraphicsScene scene;
CustomItem *item = new CustomItem(0, 0, 100, 100);
scene.addItem(item);
QGraphicsView view(&scene);
view.show();
QTest::qWaitForWindowShown(&view);
QTRY_VERIFY(item->numRepaints > 0);
item->reset();
// Make sure installing the effect triggers a repaint.
CustomEffect *effect = new CustomEffect;
item->setGraphicsEffect(effect);
QTRY_COMPARE(effect->numRepaints, 1);
QTRY_COMPARE(item->numRepaints, 1);
// Make sure QPainter* and QStyleOptionGraphicsItem* stays persistent
// during QGraphicsEffect::draw/QGraphicsItem::paint.
QVERIFY(effect->m_painter);
QCOMPARE(effect->m_painter, item->m_painter);
QCOMPARE(effect->m_styleOption, item->m_styleOption);
// Make sure QGraphicsEffect::source is persistent.
QCOMPARE(effect->m_source, effect->source());
effect->reset();
item->reset();
// Make sure updating the source triggers a repaint.
item->update();
QTRY_COMPARE(effect->numRepaints, 1);
QTRY_COMPARE(item->numRepaints, 1);
QVERIFY(effect->m_sourceChangedFlags & QGraphicsEffect::SourceInvalidated);
effect->reset();
item->reset();
// Make sure changing the effect's bounding rect triggers a repaint.
effect->setMargin(20);
QTRY_COMPARE(effect->numRepaints, 1);
QTRY_COMPARE(item->numRepaints, 1);
effect->reset();
item->reset();
// Make sure change the item's bounding rect triggers a repaint.
item->setRect(0, 0, 50, 50);
QTRY_COMPARE(effect->numRepaints, 1);
QTRY_COMPARE(item->numRepaints, 1);
QVERIFY(effect->m_sourceChangedFlags & QGraphicsEffect::SourceBoundingRectChanged);
effect->reset();
item->reset();
// Make sure the effect is the one to issue a repaint of the item.
effect->doNothingInDraw = true;
item->update();
QTRY_COMPARE(effect->numRepaints, 1);
QCOMPARE(item->numRepaints, 0);
effect->doNothingInDraw = false;
effect->reset();
item->reset();
// Make sure we update the source when disabling/enabling the effect.
effect->setEnabled(false);
QTest::qWait(50);
QCOMPARE(effect->numRepaints, 0);
QCOMPARE(item->numRepaints, 1);
effect->reset();
item->reset();
effect->setEnabled(true);
QTRY_COMPARE(effect->numRepaints, 1);
QTRY_COMPARE(item->numRepaints, 1);
effect->reset();
item->reset();
// Effect is already enabled; nothing should happen.
effect->setEnabled(true);
QTest::qWait(50);
QCOMPARE(effect->numRepaints, 0);
QCOMPARE(item->numRepaints, 0);
// Make sure uninstalling an effect triggers a repaint.
QPointer<CustomEffect> ptr = effect;
item->setGraphicsEffect(0);
QVERIFY(!ptr);
QTRY_COMPARE(item->numRepaints, 1);
}
