Fixes performance problem with scribble avoiding to redraw whole screen on every MotionNotify event.

Merge-request: 2210
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@nokia.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/examples/widgets/scribble/scribblearea.cpp b/examples/widgets/scribble/scribblearea.cpp
index 6c9d8aa..2bc2a69 100644
--- a/examples/widgets/scribble/scribblearea.cpp
+++ b/examples/widgets/scribble/scribblearea.cpp
@@ -139,11 +139,12 @@ void ScribbleArea::mouseReleaseEvent(QMouseEvent *event)
 }
 
 //! [12] //! [13]
-void ScribbleArea::paintEvent(QPaintEvent * /* event */)
+void ScribbleArea::paintEvent(QPaintEvent *event)
 //! [13] //! [14]
 {
     QPainter painter(this);
-    painter.drawImage(QPoint(0, 0), image);
+    QRect dirtyRect = event->rect();
+    painter.drawImage(dirtyRect, image, dirtyRect);
 }
 //! [14]