QPaintEvent(3qt)QPaintEvent(3qt)NAMEQPaintEvent - Event parameters for paint events
SYNOPSIS
#include <qevent.h>
Inherits QEvent.
Public Members
QPaintEvent ( const QRegion & paintRegion, bool erased = TRUE )
QPaintEvent ( const QRect & paintRect, bool erased = TRUE )
QPaintEvent ( const QRegion & paintRegion, const QRect & paintRect,
bool erased = TRUE )
const QRect & rect () const
const QRegion & region () const
bool erased () const
DESCRIPTION
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 arbitrary.
See also QPainter, QWidget::update(), QWidget::repaint(),
QWidget::paintEvent(), QWidget::backgroundMode, QRegion, and Event
Classes.
MEMBER FUNCTION DOCUMENTATIONQPaintEvent::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 also given by paintRect. If erased is TRUE the
region will be cleared before repainting.
QPaintEvent::QPaintEvent ( const QRegion & paintRegion, const QRect &
paintRect, bool erased = TRUE )
Constructs a paint event object with the rectangle paintRect that
should be updated. The region is given by paintRegion. 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().
Examples:
const QRegion & QPaintEvent::region () const
Returns the region that should be updated.
See also rect() and QPainter::setClipRegion().
Examples:
SEE ALSO
http://doc.trolltech.com/qpaintevent.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
license file included in the distribution for a complete license
statement.
AUTHOR
Generated automatically from the source code.
BUGS
If you find a bug in Qt, please report it as described in
http://doc.trolltech.com/bughowto.html. Good bug reports help us to
help you. Thank you.
The definitive Qt documentation is provided in HTML format; it is
located at $QTDIR/doc/html and can be read using Qt Assistant or with a
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by Trolltech.
If you find errors in this manual page, please report them to qt-
bugs@trolltech.com. Please include the name of the manual page
(qpaintevent.3qt) and the Qt version (3.3.8).
Trolltech AS 2 February 2007 QPaintEvent(3qt)
