QPaintEvent - Event parameters for paint events
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
The QPaintEvent 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 is 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 can't make much use of
region(), and rect() can be much faster than region().boundingRect(). Painting is clipped
to region() during processing of a paint event.
The erased() function returns TRUE if the region() has been cleared to the widget's
background (see QWidget::backgroundMode()), and FALSE if the region's contents are
See also QPainter, QWidget::update(), QWidget::repaint(), QWidget::paintEvent(),
QWidget::backgroundMode, QRegion, and Event Classes.
MEMBER FUNCTION DOCUMENTATION
QPaintEvent::QPaintEvent ( const QRegion & paintRegion, bool erased = TRUE )
Constructs a paint event object with the region that should be updated. The region is
given by paintRegion. If erased is TRUE the region will be cleared before repainting.
QPaintEvent::QPaintEvent ( const QRect & paintRect, bool erased = TRUE )
Constructs a paint event object with the rectangle that should be updated. The region is
given by paintRect. If erased is TRUE the region will be cleared before repainting.
bool QPaintEvent::erased () const
Returns TRUE if the paint event region (or rectangle) has been erased with the widget's
background; otherwise returns FALSE.
const QRect & QPaintEvent::rect () const
Returns the rectangle that should be updated.
See also region() and QPainter::setClipRect().
const QRegion & QPaintEvent::region () const
Returns the region that should be updated.
See also rect() and QPainter::setClipRegion().
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Trolltech AS 9 December 2002 QPaintEvent(3qt)