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<li class="level1"><a href="#public-types">Public Types</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
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<h1 class="title">QRubberBand Class Reference</h1>
<!-- $$$QRubberBand-brief -->
<p>The QRubberBand class provides a rectangle or line that can indicate a selection or a boundary. <a href="#details">More...</a></p>
<!-- @@@QRubberBand -->
<pre class="cpp"> <span class="preprocessor">#include <QRubberBand></span></pre><p><b>Inherits: </b><a href="qwidget.html">QWidget</a>.</p>
<ul>
<li><a href="qrubberband-members.html">List of all members, including inherited members</a></li>
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<a name="public-types"></a>
<h2>Public Types</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> enum </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#Shape-enum">Shape</a></b> { Line, Rectangle }</td></tr>
</table>
<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#QRubberBand">QRubberBand</a></b> ( Shape <i>s</i>, QWidget * <i>p</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#dtor.QRubberBand">~QRubberBand</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#move">move</a></b> ( int <i>x</i>, int <i>y</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#move-2">move</a></b> ( const QPoint & <i>p</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#resize">resize</a></b> ( int <i>width</i>, int <i>height</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#resize-2">resize</a></b> ( const QSize & <i>size</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#setGeometry">setGeometry</a></b> ( const QRect & <i>rect</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#setGeometry-2">setGeometry</a></b> ( int <i>x</i>, int <i>y</i>, int <i>width</i>, int <i>height</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> Shape </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#shape">shape</a></b> () const</td></tr>
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<ul>
<li class="fn">221 public functions inherited from <a href="qwidget.html#public-functions">QWidget</a></li>
<li class="fn">29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
<li class="fn">13 public functions inherited from <a href="qpaintdevice.html#public-functions">QPaintDevice</a></li>
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<a name="protected-functions"></a>
<h2>Protected Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#initStyleOption">initStyleOption</a></b> ( QStyleOptionRubberBand * <i>option</i> ) const</td></tr>
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<a name="reimplemented-protected-functions"></a>
<h2>Reimplemented Protected Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#changeEvent">changeEvent</a></b> ( QEvent * <i>e</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#event">event</a></b> ( QEvent * <i>e</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#moveEvent">moveEvent</a></b> ( QMoveEvent * )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#paintEvent">paintEvent</a></b> ( QPaintEvent * )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#resizeEvent">resizeEvent</a></b> ( QResizeEvent * )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qrubberband.html#showEvent">showEvent</a></b> ( QShowEvent * <i>e</i> )</td></tr>
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<li class="fn">37 protected functions inherited from <a href="qwidget.html#protected-functions">QWidget</a></li>
<li class="fn">8 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
<li class="fn">1 protected function inherited from <a href="qpaintdevice.html#protected-functions">QPaintDevice</a></li>
</ul>
<h3>Additional Inherited Members</h3>
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<li class="fn">58 properties inherited from <a href="qwidget.html#properties">QWidget</a></li>
<li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li>
<li class="fn">19 public slots inherited from <a href="qwidget.html#public-slots">QWidget</a></li>
<li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
<li class="fn">1 signal inherited from <a href="qwidget.html#signals">QWidget</a></li>
<li class="fn">1 signal inherited from <a href="qobject.html#signals">QObject</a></li>
<li class="fn">4 static public members inherited from <a href="qwidget.html#static-public-members">QWidget</a></li>
<li class="fn">7 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
<li class="fn">1 protected slot inherited from <a href="qwidget.html#protected-slots">QWidget</a></li>
</ul>
<a name="details"></a>
<!-- $$$QRubberBand-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QRubberBand class provides a rectangle or line that can indicate a selection or a boundary.</p>
<p>A rubber band is often used to show a new bounding area (as in a <a href="qsplitter.html">QSplitter</a> or a <a href="qdockwidget.html">QDockWidget</a> that is undocking). Historically this has been implemented using a <a href="qpainter.html">QPainter</a> and XOR, but this approach doesn't always work properly since rendering can happen in the window below the rubber band, but before the rubber band has been "erased".</p>
<p>You can create a QRubberBand whenever you need to render a rubber band around a given area (or to represent a single line), then call <a href="qrubberband.html#setGeometry">setGeometry</a>(), <a href="qrubberband.html#move">move</a>() or <a href="qrubberband.html#resize">resize</a>() to position and size it. A common pattern is to do this in conjunction with mouse events. For example:</p>
<pre class="cpp"> <span class="type">void</span> Widget<span class="operator">::</span><a href="qwidget.html#mousePressEvent">mousePressEvent</a>(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
origin <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos();
<span class="keyword">if</span> (<span class="operator">!</span>rubberBand)
rubberBand <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QRubberBand</span>(<span class="type">QRubberBand</span><span class="operator">::</span>Rectangle<span class="operator">,</span> <span class="keyword">this</span>);
rubberBand<span class="operator">-</span><span class="operator">></span>setGeometry(<span class="type"><a href="qrect.html">QRect</a></span>(origin<span class="operator">,</span> <span class="type"><a href="qsize.html">QSize</a></span>()));
rubberBand<span class="operator">-</span><span class="operator">></span>show();
}
<span class="type">void</span> Widget<span class="operator">::</span><a href="qwidget.html#mouseMoveEvent">mouseMoveEvent</a>(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
rubberBand<span class="operator">-</span><span class="operator">></span>setGeometry(<span class="type"><a href="qrect.html">QRect</a></span>(origin<span class="operator">,</span> event<span class="operator">-</span><span class="operator">></span>pos())<span class="operator">.</span>normalized());
}
<span class="type">void</span> Widget<span class="operator">::</span><a href="qwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
rubberBand<span class="operator">-</span><span class="operator">></span>hide();
<span class="comment">// determine selection, for example using QRect::intersects()</span>
<span class="comment">// and QRect::contains().</span>
}</pre>
<p>If you pass a parent to QRubberBand's constructor, the rubber band will display only inside its parent, but stays on top of other child widgets. If no parent is passed, QRubberBand will act as a top-level widget.</p>
<p>Call <a href="qwidget.html#show">show</a>() to make the rubber band visible; also when the rubber band is not a top-level. Hiding or destroying the widget will make the rubber band disappear. The rubber band can be a <a href="qrubberband.html#Shape-enum">Rectangle</a> or a <a href="qrubberband.html#Shape-enum">Line</a> (vertical or horizontal), depending on the <a href="qrubberband.html#shape">shape</a>() it was given when constructed.</p>
</div>
<!-- @@@QRubberBand -->
<div class="types">
<h2>Member Type Documentation</h2>
<!-- $$$Shape$$$Line$$$Rectangle -->
<h3 class="fn"><a name="Shape-enum"></a>enum QRubberBand::<span class="name">Shape</span></h3>
<p>This enum specifies what shape a <a href="qrubberband.html">QRubberBand</a> should have. This is a drawing hint that is passed down to the style system, and can be interpreted by each <a href="qstyle.html">QStyle</a>.</p>
<table class="valuelist"><tr valign="top" class="odd"><th class="tblConst">Constant</th><th class="tblval">Value</th><th class="tbldscr">Description</th></tr>
<tr><td class="topAlign"><tt>QRubberBand::Line</tt></td><td class="topAlign"><tt>0</tt></td><td class="topAlign">A <a href="qrubberband.html">QRubberBand</a> can represent a vertical or horizontal line. Geometry is still given in <a href="qwidget.html#rect-prop">rect</a>() and the line will fill the given geometry on most styles.</td></tr>
<tr><td class="topAlign"><tt>QRubberBand::Rectangle</tt></td><td class="topAlign"><tt>1</tt></td><td class="topAlign">A <a href="qrubberband.html">QRubberBand</a> can represent a rectangle. Some styles will interpret this as a filled (often semi-transparent) rectangle, or a rectangular outline.</td></tr>
</table>
<!-- @@@Shape -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QRubberBand[overload1]$$$QRubberBandShapeQWidget* -->
<h3 class="fn"><a name="QRubberBand"></a>QRubberBand::<span class="name">QRubberBand</span> ( <span class="type"><a href="qrubberband.html#Shape-enum">Shape</a></span> <i>s</i>, <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>p</i> = 0 )</h3>
<p>Constructs a rubber band of shape <i>s</i>, with parent <i>p</i>.</p>
<p>By default a rectangular rubber band (<i>s</i> is <tt>Rectangle</tt>) will use a mask, so that a small border of the rectangle is all that is visible. Some styles (e.g., native Mac OS X) will change this and call <a href="qwidget.html#windowOpacity-prop">QWidget::setWindowOpacity</a>() to make a semi-transparent filled selection rectangle.</p>
<!-- @@@QRubberBand -->
<!-- $$$~QRubberBand[overload1]$$$~QRubberBand -->
<h3 class="fn"><a name="dtor.QRubberBand"></a>QRubberBand::<span class="name">~QRubberBand</span> ()</h3>
<p>Destructor.</p>
<!-- @@@~QRubberBand -->
<!-- $$$changeEvent[overload1]$$$changeEventQEvent* -->
<h3 class="fn"><a name="changeEvent"></a><span class="type">void</span> QRubberBand::<span class="name">changeEvent</span> ( <span class="type"><a href="qevent.html">QEvent</a></span> * <i>e</i> )<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#changeEvent">QWidget::changeEvent</a>().</p>
<!-- @@@changeEvent -->
<!-- $$$event[overload1]$$$eventQEvent* -->
<h3 class="fn"><a name="event"></a><span class="type">bool</span> QRubberBand::<span class="name">event</span> ( <span class="type"><a href="qevent.html">QEvent</a></span> * <i>e</i> )<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qobject.html#event">QObject::event</a>().</p>
<!-- @@@event -->
<!-- $$$initStyleOption[overload1]$$$initStyleOptionQStyleOptionRubberBand* -->
<h3 class="fn"><a name="initStyleOption"></a><span class="type">void</span> QRubberBand::<span class="name">initStyleOption</span> ( <span class="type"><a href="qstyleoptionrubberband.html">QStyleOptionRubberBand</a></span> * <i>option</i> ) const<tt> [protected]</tt></h3>
<p>Initialize <i>option</i> with the values from this <a href="qrubberband.html">QRubberBand</a>. This method is useful for subclasses when they need a <a href="qstyleoptionrubberband.html">QStyleOptionRubberBand</a>, but don't want to fill in all the information themselves.</p>
<p><b>See also </b><a href="qstyleoption.html#initFrom">QStyleOption::initFrom</a>().</p>
<!-- @@@initStyleOption -->
<!-- $$$move[overload1]$$$moveintint -->
<h3 class="fn"><a name="move"></a><span class="type">void</span> QRubberBand::<span class="name">move</span> ( <span class="type">int</span> <i>x</i>, <span class="type">int</span> <i>y</i> )</h3>
<p>Moves the rubberband to point (<i>x</i>, <i>y</i>).</p>
<p><b>See also </b><a href="qrubberband.html#resize">resize</a>().</p>
<!-- @@@move -->
<!-- $$$move$$$moveconstQPoint& -->
<h3 class="fn"><a name="move-2"></a><span class="type">void</span> QRubberBand::<span class="name">move</span> ( const <span class="type"><a href="qpoint.html">QPoint</a></span> & <i>p</i> )</h3>
<p>This is an overloaded function.</p>
<p>Moves the rubberband to point <i>p</i>.</p>
<p><b>See also </b><a href="qrubberband.html#resize">resize</a>().</p>
<!-- @@@move -->
<!-- $$$moveEvent[overload1]$$$moveEventQMoveEvent* -->
<h3 class="fn"><a name="moveEvent"></a><span class="type">void</span> QRubberBand::<span class="name">moveEvent</span> ( <span class="type"><a href="qmoveevent.html">QMoveEvent</a></span> * )<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#moveEvent">QWidget::moveEvent</a>().</p>
<!-- @@@moveEvent -->
<!-- $$$paintEvent[overload1]$$$paintEventQPaintEvent* -->
<h3 class="fn"><a name="paintEvent"></a><span class="type">void</span> QRubberBand::<span class="name">paintEvent</span> ( <span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> * )<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#paintEvent">QWidget::paintEvent</a>().</p>
<!-- @@@paintEvent -->
<!-- $$$resize[overload1]$$$resizeintint -->
<h3 class="fn"><a name="resize"></a><span class="type">void</span> QRubberBand::<span class="name">resize</span> ( <span class="type">int</span> <i>width</i>, <span class="type">int</span> <i>height</i> )</h3>
<p>Resizes the rubberband so that its width is <i>width</i>, and its height is <i>height</i>.</p>
<p><b>See also </b><a href="qrubberband.html#move">move</a>().</p>
<!-- @@@resize -->
<!-- $$$resize$$$resizeconstQSize& -->
<h3 class="fn"><a name="resize-2"></a><span class="type">void</span> QRubberBand::<span class="name">resize</span> ( const <span class="type"><a href="qsize.html">QSize</a></span> & <i>size</i> )</h3>
<p>This is an overloaded function.</p>
<p>Resizes the rubberband so that its new size is <i>size</i>.</p>
<p><b>See also </b><a href="qrubberband.html#move">move</a>().</p>
<!-- @@@resize -->
<!-- $$$resizeEvent[overload1]$$$resizeEventQResizeEvent* -->
<h3 class="fn"><a name="resizeEvent"></a><span class="type">void</span> QRubberBand::<span class="name">resizeEvent</span> ( <span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> * )<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#resizeEvent">QWidget::resizeEvent</a>().</p>
<!-- @@@resizeEvent -->
<!-- $$$setGeometry[overload1]$$$setGeometryconstQRect& -->
<h3 class="fn"><a name="setGeometry"></a><span class="type">void</span> QRubberBand::<span class="name">setGeometry</span> ( const <span class="type"><a href="qrect.html">QRect</a></span> & <i>rect</i> )</h3>
<p>Sets the geometry of the rubber band to <i>rect</i>, specified in the coordinate system of its parent widget.</p>
<p><b>See also </b><a href="qwidget.html#geometry-prop">QWidget::geometry</a>.</p>
<!-- @@@setGeometry -->
<!-- $$$setGeometry$$$setGeometryintintintint -->
<h3 class="fn"><a name="setGeometry-2"></a><span class="type">void</span> QRubberBand::<span class="name">setGeometry</span> ( <span class="type">int</span> <i>x</i>, <span class="type">int</span> <i>y</i>, <span class="type">int</span> <i>width</i>, <span class="type">int</span> <i>height</i> )</h3>
<p>This is an overloaded function.</p>
<p>Sets the geometry of the rubberband to the rectangle whose top-left corner lies at the point (<i>x</i>, <i>y</i>), and with dimensions specified by <i>width</i> and <i>height</i>. The geometry is specified in the parent widget's coordinate system.</p>
<!-- @@@setGeometry -->
<!-- $$$shape[overload1]$$$shape -->
<h3 class="fn"><a name="shape"></a><span class="type"><a href="qrubberband.html#Shape-enum">Shape</a></span> QRubberBand::<span class="name">shape</span> () const</h3>
<p>Returns the shape of this rubber band. The shape can only be set upon construction.</p>
<!-- @@@shape -->
<!-- $$$showEvent[overload1]$$$showEventQShowEvent* -->
<h3 class="fn"><a name="showEvent"></a><span class="type">void</span> QRubberBand::<span class="name">showEvent</span> ( <span class="type"><a href="qshowevent.html">QShowEvent</a></span> * <i>e</i> )<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#showEvent">QWidget::showEvent</a>().</p>
<!-- @@@showEvent -->
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