Make sure the BSP is updated when a graphics effect changes bounding rect.

In the case of applying an effect to a QGraphicsItem, we have to notify
the scene's BSP that the item's bounding rect has changed. We do this
by calling prepareGeometryChange().

In the case of QWidget, it's sub-optimal that we update its parent, but
there's no other way to solve it at the moment.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/gui/kernel/qwidget_p.h b/src/gui/kernel/qwidget_p.h
index ff0c453..f69c3a7 100644
--- a/src/gui/kernel/qwidget_p.h
+++ b/src/gui/kernel/qwidget_p.h
@@ -727,6 +727,16 @@ public:
     inline bool isPixmap() const
     { return false; }
 
+    inline void effectBoundingRectChanged()
+    {
+        // ### This function should take a rect parameter; then we can avoid
+        // updating too much on the parent widget.
+        if (QWidget *parent = m_widget->parentWidget())
+            parent->update();
+        else
+            m_widget->update();
+    }
+
     inline const QStyleOption *styleOption() const
     { return 0; }