222     void update_ancestorClipsChildrenToShape2();

  3819 void tst_QGraphicsView::update_ancestorClipsChildrenToShape2()

  3820 {

  3821     QGraphicsScene scene(-150, -150, 300, 300);

  3822 

  3823     /*

  3824     Add two rects:

  3825 

  3826     +------------------+

  3827     | child            |

  3828     | +--------------+ |

  3829     | | parent       | |

  3830     | |              | |

  3831     | |              | |

  3832     | |              | |

  3833     | +--------------+ |

  3834     +------------------+

  3835 

  3836     ... where the parent has no contents and clips the child to shape.

  3837     */

  3838     QApplication::processEvents(); // Get rid of pending update.

  3839 

  3840     QGraphicsRectItem *parent = static_cast<QGraphicsRectItem *>(scene.addRect(-50, -50, 100, 100));

  3841     parent->setBrush(QColor(0, 0, 255, 125));

  3842     parent->setFlag(QGraphicsItem::ItemClipsChildrenToShape);

  3843     parent->setFlag(QGraphicsItem::ItemHasNoContents);

  3844 

  3845     QGraphicsRectItem *child = static_cast<QGraphicsRectItem *>(scene.addRect(-100, -100, 200, 200));

  3846     child->setBrush(QColor(255, 0, 0, 125));

  3847     child->setParentItem(parent);

  3848 

  3849     CustomView view(&scene);

  3850     view.show();

  3851     QTest::qWaitForWindowShown(&view);

  3852     QTRY_VERIFY(view.painted);

  3853 

  3854     view.lastUpdateRegions.clear();

  3855     view.painted = false;

  3856 

  3857     // Call child->update() and make sure the updated area is within its parent's clip.

  3858     QRectF expected = child->deviceTransform(view.viewportTransform()).mapRect(child->boundingRect());

  3859     expected &= parent->deviceTransform(view.viewportTransform()).mapRect(parent->boundingRect());

  3860 

  3861     child->update();

  3862     QTRY_VERIFY(view.painted);

  3863 

  3864 #ifndef QT_MAC_USE_COCOA //cocoa doesn't support drawing regions

  3865     QTRY_VERIFY(view.painted);

  3866     QCOMPARE(view.lastUpdateRegions.size(), 1);

  3867     QCOMPARE(view.lastUpdateRegions.at(0), QRegion(expected.toAlignedRect()));

  3868 #endif

  3869 

  3870     QTest::qWait(50);

  3871 

  3872     view.lastUpdateRegions.clear();

  3873     view.painted = false;

  3874 

  3875     // Invalidate the parent's geometry and trigger an update.

  3876     // The update area should be clipped to the parent's bounding rect for 'normal' items,

  3877     // but in this case the item has no contents (ItemHasNoContents) and its geometry

  3878     // is invalidated, which means we cannot clip the child update. So, the expected

  3879     // area is exactly the same as the child's bounding rect (adjusted for antialiasing).

  3880     parent->setRect(parent->rect().adjusted(-10, -10, -10, -10));

  3881     expected = child->deviceTransform(view.viewportTransform()).mapRect(child->boundingRect());

  3882     expected.adjust(-2, -2, 2, 2); // Antialiasing

  3883 

  3884 #ifndef QT_MAC_USE_COCOA //cocoa doesn't support drawing regions

  3885     QTRY_VERIFY(view.painted);

  3886     QCOMPARE(view.lastUpdateRegions.size(), 1);

  3887     QCOMPARE(view.lastUpdateRegions.at(0), QRegion(expected.toAlignedRect()));

  3888 #endif

  3889 }

  3890