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120 lines
6.4 KiB
120 lines
6.4 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qevent.cpp:1251 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QPaintEvent Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QPaintEvent Class Reference</h1>
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<p>The QPaintEvent class contains event parameters for paint events.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qevent-h.html">qevent.h</a>></tt>
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<p>Inherits <a href="qevent.html">QEvent</a>.
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<p><a href="qpaintevent-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#QPaintEvent"><b>QPaintEvent</b></a> ( const QRegion & paintRegion, bool erased = TRUE )</li>
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<li class=fn><a href="#QPaintEvent-2"><b>QPaintEvent</b></a> ( const QRect & paintRect, bool erased = TRUE )</li>
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<li class=fn><a href="#QPaintEvent-3"><b>QPaintEvent</b></a> ( const QRegion & paintRegion, const QRect & paintRect, bool erased = TRUE )</li>
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<li class=fn>const QRect & <a href="#rect"><b>rect</b></a> () const</li>
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<li class=fn>const QRegion & <a href="#region"><b>region</b></a> () const</li>
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<li class=fn>bool <a href="#erased"><b>erased</b></a> () const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QPaintEvent class contains event parameters for paint events.
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<p>
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<p> Paint events are sent to widgets that need to update themselves,
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for instance when part of a widget is exposed because a covering
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widget is moved.
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<p> The event contains a <a href="#region">region</a>() that needs to be updated, and a
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<a href="#rect">rect</a>() that is the bounding rectangle of that region. Both are
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provided because many widgets can't make much use of region(), and
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rect() can be much faster than region().boundingRect(). Painting
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is clipped to region() during processing of a paint event.
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<p> The <a href="#erased">erased</a>() function returns TRUE if the region() has been
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cleared to the widget's background (see
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<a href="qwidget.html#backgroundMode">QWidget::backgroundMode</a>()), and FALSE if the region's contents are
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arbitrary.
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<p> <p>See also <a href="qpainter.html">QPainter</a>, <a href="qwidget.html#update">QWidget::update</a>(), <a href="qwidget.html#repaint">QWidget::repaint</a>(), <a href="qwidget.html#paintEvent">QWidget::paintEvent</a>(), <a href="qwidget.html#backgroundMode-prop">QWidget::backgroundMode</a>, <a href="qregion.html">QRegion</a>, and <a href="events.html">Event Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QPaintEvent"></a>QPaintEvent::QPaintEvent ( const <a href="qregion.html">QRegion</a> & paintRegion, bool erased = TRUE )
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</h3>
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<p> Constructs a paint event object with the region that should be
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updated. The region is given by <em>paintRegion</em>. If <em>erased</em> is
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TRUE the region will be cleared before repainting.
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<h3 class=fn><a name="QPaintEvent-2"></a>QPaintEvent::QPaintEvent ( const <a href="qrect.html">QRect</a> & paintRect, bool erased = TRUE )
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</h3>
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<p> Constructs a paint event object with the rectangle that should be
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updated. The region is also given by <em>paintRect</em>. If <em>erased</em> is
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TRUE the region will be cleared before repainting.
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<h3 class=fn><a name="QPaintEvent-3"></a>QPaintEvent::QPaintEvent ( const <a href="qregion.html">QRegion</a> & paintRegion, const <a href="qrect.html">QRect</a> & paintRect, bool erased = TRUE )
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</h3>
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<p> Constructs a paint event object with the rectangle <em>paintRect</em>
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that should be updated. The region is given by <em>paintRegion</em>. If
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<em>erased</em> is TRUE the region will be cleared before repainting.
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<h3 class=fn>bool <a name="erased"></a>QPaintEvent::erased () const
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</h3>
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<p> Returns TRUE if the paint event region (or rectangle) has been
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erased with the widget's background; otherwise returns FALSE.
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<h3 class=fn>const <a href="qrect.html">QRect</a> & <a name="rect"></a>QPaintEvent::rect () const
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</h3>
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<p> Returns the rectangle that should be updated.
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<p> <p>See also <a href="#region">region</a>() and <a href="qpainter.html#setClipRect">QPainter::setClipRect</a>().
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<p>Examples: <a href="life-example.html#x1892">life/life.cpp</a>, <a href="qfd-example.html#x2001">qfd/fontdisplayer.cpp</a>, <a href="showimg-example.html#x1340">showimg/showimg.cpp</a>, <a href="tutorial1-10.html#x2357">t10/cannon.cpp</a>, <a href="tutorial1-11.html#x2369">t11/cannon.cpp</a>, <a href="tutorial1-13.html#x2405">t13/cannon.cpp</a>, and <a href="tooltip-example.html#x446">tooltip/tooltip.cpp</a>.
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<h3 class=fn>const <a href="qregion.html">QRegion</a> & <a name="region"></a>QPaintEvent::region () const
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</h3>
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<p> Returns the region that should be updated.
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<p> <p>See also <a href="#rect">rect</a>() and <a href="qpainter.html#setClipRegion">QPainter::setClipRegion</a>().
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<p>Examples: <a href="qfd-example.html#x2002">qfd/fontdisplayer.cpp</a> and <a href="scribble-example.html#x920">scribble/scribble.cpp</a>.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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