Paint events are sent to widgets that need to update themselves, for instance when part of a widget is exposed because a covering widget was moved.
The event contains a
region() that needs to be updated, and a
rect() that is the bounding rectangle of that region. Both are provided because many widgets cannot make much use of
region() , and
rect() can be much faster than
Painting is clipped to
region() during the processing of a paint event. This clipping is performed by Qt’s paint system and is independent of any clipping that may be applied to a
QPainter used to draw on the paint device.
Returns the rectangle that needs to be updated.
Returns the region that needs to be updated.
© 2021 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.