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<title>Qt 4.8: QSlider Class Reference</title>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-types">Public Types</a></li>
<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#protected-functions">Protected Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QSlider Class Reference</h1>
<!-- $$$QSlider-brief -->
<p>The QSlider widget provides a vertical or horizontal slider. <a href="#details">More...</a></p>
<!-- @@@QSlider -->
<pre class="cpp"> <span class="preprocessor">#include <QSlider></span></pre><p><b>Inherits: </b><a href="qabstractslider.html">QAbstractSlider</a>.</p>
<ul>
<li><a href="qslider-members.html">List of all members, including inherited members</a></li>
<li><a href="qslider-qt3.html">Qt 3 support members</a></li>
</ul>
<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="qslider.html#TickPosition-enum">TickPosition</a></b> { NoTicks, TicksBothSides, TicksAbove, TicksBelow, TicksLeft, TicksRight }</td></tr>
</table>
<a name="properties"></a>
<h2>Properties</h2>
<ul>
<li class="fn"><b><a href="qslider.html#tickInterval-prop">tickInterval</a></b> : int</li>
<li class="fn"><b><a href="qslider.html#tickPosition-prop">tickPosition</a></b> : TickPosition</li>
</ul>
<ul>
<li class="fn">11 properties inherited from <a href="qabstractslider.html#properties">QAbstractSlider</a></li>
<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>
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<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="qslider.html#QSlider">QSlider</a></b> ( QWidget * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qslider.html#QSlider-2">QSlider</a></b> ( Qt::Orientation <i>orientation</i>, QWidget * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qslider.html#dtor.QSlider">~QSlider</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qslider.html#tickInterval-prop">setTickInterval</a></b> ( int <i>ti</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qslider.html#tickPosition-prop">setTickPosition</a></b> ( TickPosition <i>position</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qslider.html#tickInterval-prop">tickInterval</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> TickPosition </td><td class="memItemRight bottomAlign"><b><a href="qslider.html#tickPosition-prop">tickPosition</a></b> () const</td></tr>
</table>
<a name="reimplemented-public-functions"></a>
<h2>Reimplemented Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="qslider.html#event">event</a></b> ( QEvent * <i>event</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QSize </td><td class="memItemRight bottomAlign"><b><a href="qslider.html#minimumSizeHint">minimumSizeHint</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QSize </td><td class="memItemRight bottomAlign"><b><a href="qslider.html#sizeHint">sizeHint</a></b> () const</td></tr>
</table>
<ul>
<li class="fn">22 public functions inherited from <a href="qabstractslider.html#public-functions">QAbstractSlider</a></li>
<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="qslider.html#initStyleOption">initStyleOption</a></b> ( QStyleOptionSlider * <i>option</i> ) const</td></tr>
</table>
<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="qslider.html#mouseMoveEvent">mouseMoveEvent</a></b> ( QMouseEvent * <i>ev</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qslider.html#mousePressEvent">mousePressEvent</a></b> ( QMouseEvent * <i>ev</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qslider.html#mouseReleaseEvent">mouseReleaseEvent</a></b> ( QMouseEvent * <i>ev</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qslider.html#paintEvent">paintEvent</a></b> ( QPaintEvent * <i>ev</i> )</td></tr>
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<ul>
<li class="fn">8 protected functions inherited from <a href="qabstractslider.html#protected-functions">QAbstractSlider</a></li>
<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>
<ul>
<li class="fn">2 public slots inherited from <a href="qabstractslider.html#public-slots">QAbstractSlider</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">6 signals inherited from <a href="qabstractslider.html#signals">QAbstractSlider</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>
<!-- $$$QSlider-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QSlider widget provides a vertical or horizontal slider.</p>
<p>The slider is the classic widget for controlling a bounded value. It lets the user move a slider handle along a horizontal or vertical groove and translates the handle's position into an integer value within the legal range.</p>
<p>QSlider has very few of its own functions; most of the functionality is in <a href="qabstractslider.html">QAbstractSlider</a>. The most useful functions are <a href="qabstractslider.html#value-prop">setValue</a>() to set the slider directly to some value; <a href="qabstractslider.html#triggerAction">triggerAction</a>() to simulate the effects of clicking (useful for shortcut keys); <a href="qabstractslider.html#singleStep-prop">setSingleStep</a>(), <a href="qabstractslider.html#pageStep-prop">setPageStep</a>() to set the steps; and <a href="qabstractslider.html#minimum-prop">setMinimum</a>() and <a href="qabstractslider.html#maximum-prop">setMaximum</a>() to define the range of the scroll bar.</p>
<p>QSlider provides methods for controlling tickmarks. You can use <a href="qslider.html#tickPosition-prop">setTickPosition</a>() to indicate where you want the tickmarks to be, <a href="qslider.html#tickInterval-prop">setTickInterval</a>() to indicate how many of them you want. the currently set tick position and interval can be queried using the <a href="qslider.html#tickPosition-prop">tickPosition</a>() and <a href="qslider.html#tickInterval-prop">tickInterval</a>() functions, respectively.</p>
<p>QSlider inherits a comprehensive set of signals:</p>
<table class="generic">
<thead><tr class="qt-style"><th >Signal</th><th >Description</th></tr></thead>
<tr valign="top" class="odd"><td ><a href="qabstractslider.html#valueChanged">valueChanged</a>()</td><td >Emitted when the slider's value has changed. The tracking() determines whether this signal is emitted during user interaction.</td></tr>
<tr valign="top" class="even"><td ><a href="qabstractslider.html#sliderPressed">sliderPressed</a>()</td><td >Emitted when the user starts to drag the slider.</td></tr>
<tr valign="top" class="odd"><td ><a href="qabstractslider.html#sliderMoved">sliderMoved</a>()</td><td >Emitted when the user drags the slider.</td></tr>
<tr valign="top" class="even"><td ><a href="qabstractslider.html#sliderReleased">sliderReleased</a>()</td><td >Emitted when the user releases the slider.</td></tr>
</table>
<p>QSlider only provides integer ranges. Note that although QSlider handles very large numbers, it becomes difficult for users to use a slider accurately for very large ranges.</p>
<p>A slider accepts focus on Tab and provides both a mouse wheel and a keyboard interface. The keyboard interface is the following:</p>
<ul>
<li>Left/Right move a horizontal slider by one single step.</li>
<li>Up/Down move a vertical slider by one single step.</li>
<li>PageUp moves up one page.</li>
<li>PageDown moves down one page.</li>
<li>Home moves to the start (mininum).</li>
<li>End moves to the end (maximum).</li>
</ul>
<table class="generic" width="100%">
<tr valign="top" class="odd"><td ><img src="images/macintosh-slider.png" alt="Screenshot of a Macintosh slider" /></td><td >A slider shown in the <a href="gallery-macintosh.html">Macintosh widget style</a>.</td></tr>
<tr valign="top" class="even"><td ><img src="images/windows-slider.png" alt="Screenshot of a Windows XP slider" /></td><td >A slider shown in the <a href="gallery-windowsxp.html">Windows XP widget style</a>.</td></tr>
<tr valign="top" class="odd"><td ><img src="images/plastique-slider.png" alt="Screenshot of a Plastique slider" /></td><td >A slider shown in the <a href="gallery-plastique.html">Plastique widget style</a>.</td></tr>
</table>
</div>
<p><b>See also </b><a href="qscrollbar.html">QScrollBar</a>, <a href="qspinbox.html">QSpinBox</a>, <a href="qdial.html">QDial</a>, <a href="guibooks.html#fowler">GUI Design Handbook: Slider</a>, and <a href="widgets-sliders.html">Sliders Example</a>.</p>
<!-- @@@QSlider -->
<div class="types">
<h2>Member Type Documentation</h2>
<!-- $$$TickPosition$$$NoTicks$$$TicksAbove$$$TicksLeft$$$TicksBelow$$$TicksRight$$$TicksBothSides$$$NoMarks$$$Above$$$Left$$$Below$$$Right$$$Both -->
<h3 class="fn"><a name="TickPosition-enum"></a>enum QSlider::<span class="name">TickPosition</span></h3>
<p>This enum specifies where the tick marks are to be drawn relative to the slider's groove and the handle the user moves.</p>
<table class="valuelist"><tr valign="top" class="odd"><th class="tblConst">Constant</th><th class="tblval">Value</th><th class="tbldscr">Description</th></tr>
<tr><td class="topAlign"><tt>QSlider::NoTicks</tt></td><td class="topAlign"><tt>0</tt></td><td class="topAlign">Do not draw any tick marks.</td></tr>
<tr><td class="topAlign"><tt>QSlider::TicksBothSides</tt></td><td class="topAlign"><tt>3</tt></td><td class="topAlign">Draw tick marks on both sides of the groove.</td></tr>
<tr><td class="topAlign"><tt>QSlider::TicksAbove</tt></td><td class="topAlign"><tt>1</tt></td><td class="topAlign">Draw tick marks above the (horizontal) slider</td></tr>
<tr><td class="topAlign"><tt>QSlider::TicksBelow</tt></td><td class="topAlign"><tt>2</tt></td><td class="topAlign">Draw tick marks below the (horizontal) slider</td></tr>
<tr><td class="topAlign"><tt>QSlider::TicksLeft</tt></td><td class="topAlign"><tt>TicksAbove</tt></td><td class="topAlign">Draw tick marks to the left of the (vertical) slider</td></tr>
<tr><td class="topAlign"><tt>QSlider::TicksRight</tt></td><td class="topAlign"><tt>TicksBelow</tt></td><td class="topAlign">Draw tick marks to the right of the (vertical) slider</td></tr>
</table>
<!-- @@@TickPosition -->
</div>
<div class="prop">
<h2>Property Documentation</h2>
<!-- $$$tickInterval-prop$$$tickInterval$$$setTickIntervalint -->
<h3 class="fn"><a name="tickInterval-prop"></a><span class="name">tickInterval</span> : <span class="type">int</span></h3>
<p>This property holds the interval between tickmarks.</p>
<p>This is a value interval, not a pixel interval. If it is 0, the slider will choose between <a href="qabstractslider.html#singleStep-prop">singleStep</a>() and <a href="qabstractslider.html#pageStep-prop">pageStep</a>().</p>
<p>The default value is 0.</p>
<p><b>Access functions:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> int </td><td class="memItemRight bottomAlign"><span class="name"><b>tickInterval</b></span> () const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setTickInterval</b></span> ( int <i>ti</i> )</td></tr>
</table>
<p><b>See also </b><a href="qslider.html#tickPosition-prop">tickPosition</a>, <a href="qabstractslider-qt3.html#lineStepx" class="compat">lineStep</a>(), and <a href="qabstractslider.html#pageStep-prop">pageStep</a>().</p>
<!-- @@@tickInterval -->
<!-- $$$tickPosition-prop$$$tickPosition$$$setTickPositionTickPosition -->
<h3 class="fn"><a name="tickPosition-prop"></a><span class="name">tickPosition</span> : <span class="type"><a href="qslider.html#TickPosition-enum">TickPosition</a></span></h3>
<p>This property holds the tickmark position for this slider.</p>
<p>The valid values are described by the <a href="qslider.html#TickPosition-enum">QSlider::TickPosition</a> enum.</p>
<p>The default value is <a href="qslider.html#TickPosition-enum">QSlider::NoTicks</a>.</p>
<p><b>Access functions:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> TickPosition </td><td class="memItemRight bottomAlign"><span class="name"><b>tickPosition</b></span> () const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setTickPosition</b></span> ( TickPosition <i>position</i> )</td></tr>
</table>
<p><b>See also </b><a href="qslider.html#tickInterval-prop">tickInterval</a>.</p>
<!-- @@@tickPosition -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QSlider[overload1]$$$QSliderQWidget* -->
<h3 class="fn"><a name="QSlider"></a>QSlider::<span class="name">QSlider</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>parent</i> = 0 )</h3>
<p>Constructs a vertical slider with the given <i>parent</i>.</p>
<!-- @@@QSlider -->
<!-- $$$QSlider$$$QSliderQt::OrientationQWidget* -->
<h3 class="fn"><a name="QSlider-2"></a>QSlider::<span class="name">QSlider</span> ( <span class="type"><a href="qt.html#Orientation-enum">Qt::Orientation</a></span> <i>orientation</i>, <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>parent</i> = 0 )</h3>
<p>Constructs a slider with the given <i>parent</i>. The <i>orientation</i> parameter determines whether the slider is horizontal or vertical; the valid values are <a href="qt.html#Orientation-enum">Qt::Vertical</a> and <a href="qt.html#Orientation-enum">Qt::Horizontal</a>.</p>
<!-- @@@QSlider -->
<!-- $$$~QSlider[overload1]$$$~QSlider -->
<h3 class="fn"><a name="dtor.QSlider"></a>QSlider::<span class="name">~QSlider</span> ()</h3>
<p>Destroys this slider.</p>
<!-- @@@~QSlider -->
<!-- $$$event[overload1]$$$eventQEvent* -->
<h3 class="fn"><a name="event"></a><span class="type">bool</span> QSlider::<span class="name">event</span> ( <span class="type"><a href="qevent.html">QEvent</a></span> * <i>event</i> )<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qobject.html#event">QObject::event</a>().</p>
<!-- @@@event -->
<!-- $$$initStyleOption[overload1]$$$initStyleOptionQStyleOptionSlider* -->
<h3 class="fn"><a name="initStyleOption"></a><span class="type">void</span> QSlider::<span class="name">initStyleOption</span> ( <span class="type"><a href="qstyleoptionslider.html">QStyleOptionSlider</a></span> * <i>option</i> ) const<tt> [protected]</tt></h3>
<p>Initialize <i>option</i> with the values from this <a href="qslider.html">QSlider</a>. This method is useful for subclasses when they need a <a href="qstyleoptionslider.html">QStyleOptionSlider</a>, but don't want to fill in all the information themselves.</p>
<p><b>See also </b><a href="qstyleoption.html#initFrom">QStyleOption::initFrom</a>().</p>
<!-- @@@initStyleOption -->
<!-- $$$minimumSizeHint[overload1]$$$minimumSizeHint -->
<h3 class="fn"><a name="minimumSizeHint"></a><span class="type"><a href="qsize.html">QSize</a></span> QSlider::<span class="name">minimumSizeHint</span> () const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#minimumSizeHint-prop">QWidget::minimumSizeHint</a>().</p>
<!-- @@@minimumSizeHint -->
<!-- $$$mouseMoveEvent[overload1]$$$mouseMoveEventQMouseEvent* -->
<h3 class="fn"><a name="mouseMoveEvent"></a><span class="type">void</span> QSlider::<span class="name">mouseMoveEvent</span> ( <span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> * <i>ev</i> )<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#mouseMoveEvent">QWidget::mouseMoveEvent</a>().</p>
<!-- @@@mouseMoveEvent -->
<!-- $$$mousePressEvent[overload1]$$$mousePressEventQMouseEvent* -->
<h3 class="fn"><a name="mousePressEvent"></a><span class="type">void</span> QSlider::<span class="name">mousePressEvent</span> ( <span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> * <i>ev</i> )<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#mousePressEvent">QWidget::mousePressEvent</a>().</p>
<!-- @@@mousePressEvent -->
<!-- $$$mouseReleaseEvent[overload1]$$$mouseReleaseEventQMouseEvent* -->
<h3 class="fn"><a name="mouseReleaseEvent"></a><span class="type">void</span> QSlider::<span class="name">mouseReleaseEvent</span> ( <span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> * <i>ev</i> )<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#mouseReleaseEvent">QWidget::mouseReleaseEvent</a>().</p>
<!-- @@@mouseReleaseEvent -->
<!-- $$$paintEvent[overload1]$$$paintEventQPaintEvent* -->
<h3 class="fn"><a name="paintEvent"></a><span class="type">void</span> QSlider::<span class="name">paintEvent</span> ( <span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> * <i>ev</i> )<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#paintEvent">QWidget::paintEvent</a>().</p>
<!-- @@@paintEvent -->
<!-- $$$sizeHint[overload1]$$$sizeHint -->
<h3 class="fn"><a name="sizeHint"></a><span class="type"><a href="qsize.html">QSize</a></span> QSlider::<span class="name">sizeHint</span> () const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#sizeHint-prop">QWidget::sizeHint</a>().</p>
<!-- @@@sizeHint -->
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