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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="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">QPaintEngineState Class Reference<br /><span class="small-subtitle">[<a href="qtgui.html">QtGui</a> module]</span>
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<p>The QPaintEngineState class provides information about the active paint engine's current state. <a href="#details">More...</a></p>
<pre> #include <QPaintEngineState></pre><p><b>Note:</b> All functions in this class are <a href="threads-reentrancy.html#reentrant">reentrant</a>.</p>
<p>This class was introduced in Qt 4.1.</p>
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<li><a href="qpaintenginestate-members.html">List of all members, including inherited members</a></li>
<li><a href="qpaintenginestate-obsolete.html">Obsolete members</a></li>
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<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary" border="0" cellpadding="0" cellspacing="0" width="100%">
<tr><td class="memItemLeft" align="right" valign="top">QBrush </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#backgroundBrush">backgroundBrush</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">Qt::BGMode </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#backgroundMode">backgroundMode</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QBrush </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#brush">brush</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#brushNeedsResolving">brushNeedsResolving</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPointF </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#brushOrigin">brushOrigin</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">Qt::ClipOperation </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#clipOperation">clipOperation</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPainterPath </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#clipPath">clipPath</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QRegion </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#clipRegion">clipRegion</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPainter::CompositionMode </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#compositionMode">compositionMode</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QFont </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#font">font</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#isClipEnabled">isClipEnabled</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">qreal </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#opacity">opacity</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPainter * </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#painter">painter</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPen </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#pen">pen</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#penNeedsResolving">penNeedsResolving</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPainter::RenderHints </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#renderHints">renderHints</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPaintEngine::DirtyFlags </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#state">state</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QTransform </td><td class="memItemRight" valign="bottom"><b><a href="qpaintenginestate.html#transform">transform</a></b> () const</td></tr>
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<a name="details"></a>
<hr />
<h2>Detailed Description</h2>
<p>The QPaintEngineState class provides information about the active paint engine's current state.</p>
<p>QPaintEngineState records which properties that have changed since the last time the paint engine was updated, as well as their current value.</p>
<p>Which properties that have changed can at any time be retrieved using the <a href="qpaintenginestate.html#state">state</a>() function. This function returns an instance of the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyFlags</a> type which stores an OR combination of <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyFlag</a> values. The <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyFlag</a> enum defines whether a property has changed since the last update or not.</p>
<p>If a property is marked with a dirty flag, its current value can be retrieved using the corresponding get function:</p>
<a name="getfunction"></a><p><table class="generic" align="center" cellpadding="2" cellspacing="1" border="0">
<thead><tr valign="top" class="qt-style"><th>Property Flag</th><th>Current Property Value</th></tr></thead>
<tr valign="top" class="odd"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyBackground</a></td><td><a href="qpaintenginestate.html#backgroundBrush">backgroundBrush</a>()</td></tr>
<tr valign="top" class="even"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyBackgroundMode</a></td><td><a href="qpaintenginestate.html#backgroundMode">backgroundMode</a>()</td></tr>
<tr valign="top" class="odd"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyBrush</a></td><td><a href="qpaintenginestate.html#brush">brush</a>()</td></tr>
<tr valign="top" class="even"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyBrushOrigin</a></td><td><a href="qpaintenginestate.html#brushOrigin">brushOrigin</a>()</td></tr>
<tr valign="top" class="odd"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyClipRegion</a> <i>or</i> <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyClipPath</a></td><td><a href="qpaintenginestate.html#clipOperation">clipOperation</a>()</td></tr>
<tr valign="top" class="even"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyClipPath</a></td><td><a href="qpaintenginestate.html#clipPath">clipPath</a>()</td></tr>
<tr valign="top" class="odd"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyClipRegion</a></td><td><a href="qpaintenginestate.html#clipRegion">clipRegion</a>()</td></tr>
<tr valign="top" class="even"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyCompositionMode</a></td><td><a href="qpaintenginestate.html#compositionMode">compositionMode</a>()</td></tr>
<tr valign="top" class="odd"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyFont</a></td><td><a href="qpaintenginestate.html#font">font</a>()</td></tr>
<tr valign="top" class="even"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyTransform</a></td><td><a href="qpaintenginestate.html#transform">transform</a>()</td></tr>
<tr valign="top" class="odd"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyClipEnabled</a></td><td><a href="qpaintenginestate.html#isClipEnabled">isClipEnabled</a>()</td></tr>
<tr valign="top" class="even"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyPen</a></td><td><a href="qpaintenginestate.html#pen">pen</a>()</td></tr>
<tr valign="top" class="odd"><td><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyHints</a></td><td><a href="qpaintenginestate.html#renderHints">renderHints</a>()</td></tr>
</table></p>
<p>The QPaintEngineState class also provide the <a href="qpaintenginestate.html#painter">painter</a>() function which returns a pointer to the painter that is currently updating the paint engine.</p>
<p>An instance of this class, representing the current state of the active paint engine, is passed as argument to the <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>() function. The only situation in which you will have to use this class directly is when implementing your own paint engine.</p>
<p>See also <a href="qpaintengine.html">QPaintEngine</a>.</p>
<hr />
<h2>Member Function Documentation</h2>
<a name="//apple_ref/cpp/instm/QPaintEngineState/backgroundBrush"></a>
<h3 class="fn"><a name="backgroundBrush"></a><a href="qbrush.html">QBrush</a> QPaintEngineState::backgroundBrush () const</h3>
<p>Returns the background brush in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyBackground</a> flag.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/backgroundMode"></a>
<h3 class="fn"><a name="backgroundMode"></a><a href="qt.html#BGMode-enum">Qt::BGMode</a> QPaintEngineState::backgroundMode () const</h3>
<p>Returns the background mode in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyBackgroundMode</a> flag.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/brush"></a>
<h3 class="fn"><a name="brush"></a><a href="qbrush.html">QBrush</a> QPaintEngineState::brush () const</h3>
<p>Returns the brush in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyBrush</a> flag.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/brushNeedsResolving"></a>
<h3 class="fn"><a name="brushNeedsResolving"></a>bool QPaintEngineState::brushNeedsResolving () const</h3>
<p>Returns whether the coordinate of the fill have been specified as bounded by the current rendering operation and have to be resolved (about the currently rendered primitive).</p>
<p>This function was introduced in Qt 4.3.</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/brushOrigin"></a>
<h3 class="fn"><a name="brushOrigin"></a><a href="qpointf.html">QPointF</a> QPaintEngineState::brushOrigin () const</h3>
<p>Returns the brush origin in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyBrushOrigin</a> flag.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/clipOperation"></a>
<h3 class="fn"><a name="clipOperation"></a><a href="qt.html#ClipOperation-enum">Qt::ClipOperation</a> QPaintEngineState::clipOperation () const</h3>
<p>Returns the clip operation in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes either the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyClipPath</a> or the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyClipRegion</a> flag.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/clipPath"></a>
<h3 class="fn"><a name="clipPath"></a><a href="qpainterpath.html">QPainterPath</a> QPaintEngineState::clipPath () const</h3>
<p>Returns the clip path in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyClipPath</a> flag.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/clipRegion"></a>
<h3 class="fn"><a name="clipRegion"></a><a href="qregion.html">QRegion</a> QPaintEngineState::clipRegion () const</h3>
<p>Returns the clip region in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyClipRegion</a> flag.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/compositionMode"></a>
<h3 class="fn"><a name="compositionMode"></a><a href="qpainter.html#CompositionMode-enum">QPainter::CompositionMode</a> QPaintEngineState::compositionMode () const</h3>
<p>Returns the composition mode in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyCompositionMode</a> flag.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/font"></a>
<h3 class="fn"><a name="font"></a><a href="qfont.html">QFont</a> QPaintEngineState::font () const</h3>
<p>Returns the font in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyFont</a> flag.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/isClipEnabled"></a>
<h3 class="fn"><a name="isClipEnabled"></a>bool QPaintEngineState::isClipEnabled () const</h3>
<p>Returns wether clipping is enabled or not in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyClipEnabled</a> flag.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/opacity"></a>
<h3 class="fn"><a name="opacity"></a><a href="qtglobal.html#qreal-typedef">qreal</a> QPaintEngineState::opacity () const</h3>
<p>Returns the opacity in the current paint engine state.</p>
<p>This function was introduced in Qt 4.2.</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/painter"></a>
<h3 class="fn"><a name="painter"></a><a href="qpainter.html">QPainter</a> * QPaintEngineState::painter () const</h3>
<p>Returns a pointer to the painter currently updating the paint engine.</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/pen"></a>
<h3 class="fn"><a name="pen"></a><a href="qpen.html">QPen</a> QPaintEngineState::pen () const</h3>
<p>Returns the pen in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyPen</a> flag.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/penNeedsResolving"></a>
<h3 class="fn"><a name="penNeedsResolving"></a>bool QPaintEngineState::penNeedsResolving () const</h3>
<p>Returns whether the coordinate of the stroke have been specified as bounded by the current rendering operation and have to be resolved (about the currently rendered primitive).</p>
<p>This function was introduced in Qt 4.3.</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/renderHints"></a>
<h3 class="fn"><a name="renderHints"></a><a href="qpainter.html#RenderHint-enum">QPainter::RenderHints</a> QPaintEngineState::renderHints () const</h3>
<p>Returns the render hints in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyHints</a> flag.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/state"></a>
<h3 class="fn"><a name="state"></a><a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyFlags</a> QPaintEngineState::state () const</h3>
<p>Returns a combination of flags identifying the set of properties that need to be updated when updating the paint engine's state (i.e. during a call to the <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>() function).</p>
<p>See also <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
<a name="//apple_ref/cpp/instm/QPaintEngineState/transform"></a>
<h3 class="fn"><a name="transform"></a><a href="qtransform.html">QTransform</a> QPaintEngineState::transform () const</h3>
<p>Returns the matrix in the current paint engine state.</p>
<p>This variable should only be used when the <a href="qpaintenginestate.html#state">state</a>() returns a combination which includes the <a href="qpaintengine.html#DirtyFlag-enum">QPaintEngine::DirtyTransform</a> flag.</p>
<p>This function was introduced in Qt 4.3.</p>
<p>See also <a href="qpaintenginestate.html#state">state</a>() and <a href="qpaintengine.html#updateState">QPaintEngine::updateState</a>().</p>
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