278     void removeFullyTransparentItem();

  4337 void tst_QGraphicsScene::removeFullyTransparentItem()

  4338 {

  4339     QGraphicsScene scene;

  4340 

  4341     QGraphicsItem *parent = scene.addRect(0, 0, 100, 100);

  4342     parent->setFlag(QGraphicsItem::ItemHasNoContents);

  4343 

  4344     QGraphicsItem *child = scene.addRect(0, 0, 100, 100);

  4345     child->setParentItem(parent);

  4346 

  4347     CustomView view;

  4348     view.setScene(&scene);

  4349     view.show();

  4350     QTest::qWaitForWindowShown(&view);

  4351 

  4352     // NB! The parent has the ItemHasNoContents flag set, which means

  4353     // the parent itself doesn't generate any update requests, only the

  4354     // child can possibly trigger an update. Also note that the child

  4355     // is removed before processing events.

  4356     view.repaints = 0;

  4357     parent->setOpacity(0);

  4358     QVERIFY(qFuzzyIsNull(child->effectiveOpacity()));

  4359     scene.removeItem(child);

  4360     QVERIFY(!scene.items().contains(child));

  4361     QTRY_VERIFY(view.repaints > 0);

  4362 

  4363     // Re-add child. There's nothing new to display (child is still

  4364     // effectively hidden), so it shouldn't trigger an update.

  4365     view.repaints = 0;

  4366     child->setParentItem(parent);

  4367     QVERIFY(scene.items().contains(child));

  4368     QVERIFY(qFuzzyIsNull(child->effectiveOpacity()));

  4369     QApplication::processEvents();

  4370     QCOMPARE(view.repaints, 0);

  4371 

  4372     // Nothing is visible on the screen, removing child item shouldn't trigger an update.

  4373     scene.removeItem(child);

  4374     QApplication::processEvents();

  4375     QCOMPARE(view.repaints, 0);

  4376     delete child;

  4377 }

  4378