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<title>Qt 4.0: QPaintEvent Class Reference</title>
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<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> · <a href="annotated.html"><font color="#004faf">Annotated</font></a> · <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> · <a href="functions.html"><font color="#004faf">Functions</font></a></td>
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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" 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. <a href="#details">More...</a></p>
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<pre>#include <QPaintEvent></pre><p>Part of the <a href="qtgui.html">QtGui</a> module.</p>
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<p>Inherits <a href="qevent.html">QEvent</a>.</p>
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<li><a href="qpaintevent-members.html">List of all members, including inherited members</a></li>
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<li><a href="qpaintevent-qt3.html">Qt 3 support members</a></li>
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<a name="public-functions"></a>
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<h3>Public Functions</h3>
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<li><div class="fn"/><b><a href="qpaintevent.html#QPaintEvent">QPaintEvent</a></b> ( const QRegion & <i>paintRegion</i> )</li>
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<li><div class="fn"/><b><a href="qpaintevent.html#QPaintEvent-2">QPaintEvent</a></b> ( const QRect & <i>paintRect</i> )</li>
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<li><div class="fn"/>const QRect & <b><a href="qpaintevent.html#rect">rect</a></b> () const</li>
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<li><div class="fn"/>const QRegion & <b><a href="qpaintevent.html#region">region</a></b> () const</li>
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<li><div class="fn"/>6 public functions inherited from <a href="qevent.html#public-functions">QEvent</a></li>
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<h3>Additional Inherited Members</h3>
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<li><div class="fn"/>1 property inherited from <a href="qevent.html#properties">QEvent</a></li>
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<a name="details"></a>
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<h2>Detailed Description</h2>
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<p>The QPaintEvent class contains event parameters for paint events.</p>
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<p>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.</p>
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<p>The event contains a <a href="qpaintevent.html#region">region</a>() that needs to be updated, and a <a href="qpaintevent.html#rect">rect</a>() that is the bounding rectangle of that region. Both are provided because many widgets can't make much use of <a href="qpaintevent.html#region">region</a>(), and <a href="qpaintevent.html#rect">rect</a>() can be much faster than <a href="qpaintevent.html#region">region</a>().boundingRect(). Painting is clipped to <a href="qpaintevent.html#region">region</a>() during the processing of a paint event.</p>
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<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>(), and <a href="qwidget.html#paintEvent">QWidget::paintEvent</a>().</p>
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<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> & <i>paintRegion</i> )</h3>
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<p>Constructs a paint event object with the region that needs to be updated. The region is specified by <i>paintRegion</i>.</p>
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<h3 class="fn"><a name="QPaintEvent-2"></a>QPaintEvent::QPaintEvent ( const <a href="qrect.html">QRect</a> & <i>paintRect</i> )</h3>
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<p>Constructs a paint event object with the rectangle that needs to be updated. The region is specified by <i>paintRect</i>.</p>
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<h3 class="fn"><a name="rect"></a>const <a href="qrect.html">QRect</a> & QPaintEvent::rect () const</h3>
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<p>Returns the rectangle that needs to be updated.</p>
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<p>See also <a href="qpaintevent.html#region">region</a>() and <a href="qpainter.html#setClipRect">QPainter::setClipRect</a>().</p>
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<h3 class="fn"><a name="region"></a>const <a href="qregion.html">QRegion</a> & QPaintEvent::region () const</h3>
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<p>Returns the region that needs to be updated.</p>
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<p>See also <a href="qpaintevent.html#rect">rect</a>() and <a href="qpainter.html#setClipRegion">QPainter::setClipRegion</a>().</p>
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