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QPaintEvent Class Reference

The QPaintEvent class contains event parameters for paint events. More...

#include <qevent.h>

Inherits QEvent.

List of all member functions.

Public Members

• QPaintEvent ( const QRegion & paintRegion, bool erased = TRUE ) 
• QPaintEvent ( const QRect & paintRect, bool erased = TRUE ) 
• const QRect& rect () const
• const QRegion& region () const
• bool erased () const

Detailed Description

Paint events are sent to widgets that need to update themselves, for instance when a part of a widget is exposed because an overlying widget is moved away.

The event handler QWidget::paintEvent() receives paint events.

See also QPainter, QWidget::update() and QWidget::repaint().

Examples: qtimage/qtimage.cpp grapher/grapher.cpp drawlines/connect.cpp xform/xform.cpp drawdemo/drawdemo.cpp progress/progress.cpp qmag/qmag.cpp splitter/splitter.cpp forever/forever.cpp desktop/desktop.cpp trivial/trivial.cpp picture/picture.cpp

Member Function Documentation

QPaintEvent::QPaintEvent ( const QRect & paintRect, bool erased=TRUE = TRUE )

Constructs a paint event object with the rectangle that should be updated.

QPaintEvent::QPaintEvent ( const QRegion & paintRegion, bool erased=TRUE = TRUE )

Constructs a paint event object with the region that should be updated.

bool QPaintEvent::erased () const

Returns whether the paint event region (or rectangle) has been erased with the widget's background.

const QRect & QPaintEvent::rect () const

Returns the rectangle that should be updated.

See also region() and QPainter::setClipRect().

Examples: qtimage/qtimage.cpp grapher/grapher.cpp progress/progress.cpp splitter/splitter.cpp trivial/trivial.cpp

const QRegion & QPaintEvent::region () const

Returns the region that should be updated.

See also rect() and QPainter::setClipRegion().

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