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TheQPaintEvent class contains event parameters for paint events.More...
| Header: | #include <QPaintEvent> |
| Inherits: | QEvent |
| QPaintEvent(const QRegion & paintRegion) | |
| QPaintEvent(const QRect & paintRect) | |
| const QRect & | rect() const |
| const QRegion & | region() const |
TheQPaintEvent class contains event parameters for paint events.
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 aregion() that needs to be updated, and arect() that is the bounding rectangle of that region. Both are provided because many widgets can't make much use ofregion(), andrect() can be much faster thanregion().boundingRect().
Painting is clipped toregion() 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 aQPainter used to draw on the paint device.
As a result, the value returned byQPainter::clipRegion() on a newly-constructedQPainter will not reflect the clip region that is used by the paint system.
See alsoQPainter,QWidget::update(),QWidget::repaint(), andQWidget::paintEvent().
Constructs a paint event object with the region that needs to be updated. The region is specified bypaintRegion.
Constructs a paint event object with the rectangle that needs to be updated. The region is specified bypaintRect.
Returns the rectangle that needs to be updated.
See alsoregion() andQPainter::setClipRect().
Returns the region that needs to be updated.
See alsorect() andQPainter::setClipRegion().
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