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<h1 class="title">QStackedWidget Class Reference</h1>
<!-- $$$QStackedWidget-brief -->
<p>The QStackedWidget class provides a stack of widgets where only one widget is visible at a time. <a href="#details">More...</a></p>
<!-- @@@QStackedWidget -->
<pre class="cpp"> <span class="preprocessor">#include &lt;QStackedWidget&gt;</span></pre><p><b>Inherits: </b><a href="qframe.html">QFrame</a>.</p>
<ul>
<li><a href="qstackedwidget-members.html">List of all members, including inherited members</a></li>
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<a name="properties"></a>
<h2>Properties</h2>
<ul>
<li class="fn"><b><a href="qstackedwidget.html#count-prop">count</a></b> : const int</li>
<li class="fn"><b><a href="qstackedwidget.html#currentIndex-prop">currentIndex</a></b> : int</li>
</ul>
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<li class="fn">6 properties inherited from <a href="qframe.html#properties">QFrame</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="qstackedwidget.html#QStackedWidget">QStackedWidget</a></b> ( QWidget * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#dtor.QStackedWidget">~QStackedWidget</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#addWidget">addWidget</a></b> ( QWidget * <i>widget</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#count-prop">count</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#currentIndex-prop">currentIndex</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QWidget * </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#currentWidget">currentWidget</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#indexOf">indexOf</a></b> ( QWidget * <i>widget</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#insertWidget">insertWidget</a></b> ( int <i>index</i>, QWidget * <i>widget</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#removeWidget">removeWidget</a></b> ( QWidget * <i>widget</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QWidget * </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#widget">widget</a></b> ( int <i>index</i> ) const</td></tr>
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<li class="fn">14 public functions inherited from <a href="qframe.html#public-functions">QFrame</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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<h2>Public Slots</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#currentIndex-prop">setCurrentIndex</a></b> ( int <i>index</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#setCurrentWidget">setCurrentWidget</a></b> ( QWidget * <i>widget</i> )</td></tr>
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<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>
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<a name="signals"></a>
<h2>Signals</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#currentChanged">currentChanged</a></b> ( int <i>index</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#widgetRemoved">widgetRemoved</a></b> ( int <i>index</i> )</td></tr>
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<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>
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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 bool </td><td class="memItemRight bottomAlign"><b><a href="qstackedwidget.html#event">event</a></b> ( QEvent * <i>e</i> )</td></tr>
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<li class="fn">3 protected functions inherited from <a href="qframe.html#protected-functions">QFrame</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>
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<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">3 protected functions inherited from <a href="qframe.html#protected-functions">QFrame</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>
<li class="fn">1 protected slot inherited from <a href="qwidget.html#protected-slots">QWidget</a></li>
</ul>
<a name="details"></a>
<!-- $$$QStackedWidget-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QStackedWidget class provides a stack of widgets where only one widget is visible at a time.</p>
<p>QStackedWidget can be used to create a user interface similar to the one provided by <a href="qtabwidget.html">QTabWidget</a>. It is a convenience layout widget built on top of the <a href="qstackedlayout.html">QStackedLayout</a> class.</p>
<p>Like <a href="qstackedlayout.html">QStackedLayout</a>, QStackedWidget can be constructed and populated with a number of child widgets (&quot;pages&quot;):</p>
<pre class="cpp"> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>firstPageWidget <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qwidget.html">QWidget</a></span>;
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>secondPageWidget <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qwidget.html">QWidget</a></span>;
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>thirdPageWidget <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qwidget.html">QWidget</a></span>;
<span class="type">QStackedWidget</span> <span class="operator">*</span>stackedWidget <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QStackedWidget</span>;
stackedWidget<span class="operator">-</span><span class="operator">&gt;</span>addWidget(firstPageWidget);
stackedWidget<span class="operator">-</span><span class="operator">&gt;</span>addWidget(secondPageWidget);
stackedWidget<span class="operator">-</span><span class="operator">&gt;</span>addWidget(thirdPageWidget);
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>;
layout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(stackedWidget);
setLayout(layout);</pre>
<p>QStackedWidget provides no intrinsic means for the user to switch page. This is typically done through a <a href="qcombobox.html">QComboBox</a> or a <a href="qlistwidget.html">QListWidget</a> that stores the titles of the QStackedWidget's pages. For example:</p>
<pre class="cpp"> <span class="type"><a href="qcombobox.html">QComboBox</a></span> <span class="operator">*</span>pageComboBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>;
pageComboBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Page 1&quot;</span>));
pageComboBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Page 2&quot;</span>));
pageComboBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(tr(<span class="string">&quot;Page 3&quot;</span>));
connect(pageComboBox<span class="operator">,</span> SIGNAL(activated(<span class="type">int</span>))<span class="operator">,</span>
stackedWidget<span class="operator">,</span> SLOT(setCurrentIndex(<span class="type">int</span>)));</pre>
<p>When populating a stacked widget, the widgets are added to an internal list. The <a href="qstackedwidget.html#indexOf">indexOf</a>() function returns the index of a widget in that list. The widgets can either be added to the end of the list using the <a href="qstackedwidget.html#addWidget">addWidget</a>() function, or inserted at a given index using the <a href="qstackedwidget.html#insertWidget">insertWidget</a>() function. The <a href="qstackedwidget.html#removeWidget">removeWidget</a>() function removes a widget from the stacked widget. The number of widgets contained in the stacked widget, can be obtained using the <a href="qstackedwidget.html#count-prop">count</a>() function.</p>
<p>The <a href="qstackedwidget.html#widget">widget</a>() function returns the widget at a given index position. The index of the widget that is shown on screen is given by <a href="qstackedwidget.html#currentIndex-prop">currentIndex</a>() and can be changed using <a href="qstackedwidget.html#currentIndex-prop">setCurrentIndex</a>(). In a similar manner, the currently shown widget can be retrieved using the <a href="qstackedwidget.html#currentWidget">currentWidget</a>() function, and altered using the <a href="qstackedwidget.html#setCurrentWidget">setCurrentWidget</a>() function.</p>
<p>Whenever the current widget in the stacked widget changes or a widget is removed from the stacked widget, the <a href="qstackedwidget.html#currentChanged">currentChanged</a>() and <a href="qstackedwidget.html#widgetRemoved">widgetRemoved</a>() signals are emitted respectively.</p>
</div>
<p><b>See also </b><a href="qstackedlayout.html">QStackedLayout</a>, <a href="qtabwidget.html">QTabWidget</a>, and <a href="dialogs-configdialog.html">Config Dialog Example</a>.</p>
<!-- @@@QStackedWidget -->
<div class="prop">
<h2>Property Documentation</h2>
<!-- $$$count-prop$$$count -->
<h3 class="fn"><a name="count-prop"></a><span class="name">count</span> : const <span class="type">int</span></h3>
<p>This property holds the number of widgets contained by this stacked widget.</p>
<p>By default, this property contains a value of 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>count</b></span> () const</td></tr>
</table>
<p><b>See also </b><a href="qstackedwidget.html#currentIndex-prop">currentIndex</a>() and <a href="qstackedwidget.html#widget">widget</a>().</p>
<!-- @@@count -->
<!-- $$$currentIndex-prop$$$currentIndex$$$setCurrentIndexint$$$currentChangedint -->
<h3 class="fn"><a name="currentIndex-prop"></a><span class="name">currentIndex</span> : <span class="type">int</span></h3>
<p>This property holds the index position of the widget that is visible.</p>
<p>The current index is -1 if there is no current widget.</p>
<p>By default, this property contains a value of -1 because the stack is initially empty.</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>currentIndex</b></span> () const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setCurrentIndex</b></span> ( int <i>index</i> )</td></tr>
</table>
<p><b>Notifier signal:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qstackedwidget.html#currentChanged">currentChanged</a></b></span> ( int <i>index</i> )</td></tr>
</table>
<p><b>See also </b><a href="qstackedwidget.html#currentWidget">currentWidget</a>() and <a href="qstackedwidget.html#indexOf">indexOf</a>().</p>
<!-- @@@currentIndex -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QStackedWidget[overload1]$$$QStackedWidgetQWidget* -->
<h3 class="fn"><a name="QStackedWidget"></a>QStackedWidget::<span class="name">QStackedWidget</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>parent</i> = 0 )</h3>
<p>Constructs a <a href="qstackedwidget.html">QStackedWidget</a> with the given <i>parent</i>.</p>
<p><b>See also </b><a href="qstackedwidget.html#addWidget">addWidget</a>() and <a href="qstackedwidget.html#insertWidget">insertWidget</a>().</p>
<!-- @@@QStackedWidget -->
<!-- $$$~QStackedWidget[overload1]$$$~QStackedWidget -->
<h3 class="fn"><a name="dtor.QStackedWidget"></a>QStackedWidget::<span class="name">~QStackedWidget</span> ()</h3>
<p>Destroys this stacked widget, and frees any allocated resources.</p>
<!-- @@@~QStackedWidget -->
<!-- $$$addWidget[overload1]$$$addWidgetQWidget* -->
<h3 class="fn"><a name="addWidget"></a><span class="type">int</span> QStackedWidget::<span class="name">addWidget</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> )</h3>
<p>Appends the given <i>widget</i> to the <a href="qstackedwidget.html">QStackedWidget</a> and returns the index position. Ownership of <i>widget</i> is passed on to the <a href="qstackedwidget.html">QStackedWidget</a>.</p>
<p>If the <a href="qstackedwidget.html">QStackedWidget</a> is empty before this function is called, <i>widget</i> becomes the current widget.</p>
<p><b>See also </b><a href="qstackedwidget.html#insertWidget">insertWidget</a>(), <a href="qstackedwidget.html#removeWidget">removeWidget</a>(), and <a href="qstackedwidget.html#setCurrentWidget">setCurrentWidget</a>().</p>
<!-- @@@addWidget -->
<!-- $$$currentChanged[overload1]$$$currentChangedint -->
<h3 class="fn"><a name="currentChanged"></a><span class="type">void</span> QStackedWidget::<span class="name">currentChanged</span> ( <span class="type">int</span> <i>index</i> )<tt> [signal]</tt></h3>
<p>This signal is emitted whenever the current widget changes.</p>
<p>The parameter holds the <i>index</i> of the new current widget, or -1 if there isn't a new one (for example, if there are no widgets in the <a href="qstackedwidget.html">QStackedWidget</a>).</p>
<p><b>See also </b><a href="qstackedwidget.html#currentWidget">currentWidget</a>() and <a href="qstackedwidget.html#setCurrentWidget">setCurrentWidget</a>().</p>
<!-- @@@currentChanged -->
<!-- $$$currentWidget[overload1]$$$currentWidget -->
<h3 class="fn"><a name="currentWidget"></a><span class="type"><a href="qwidget.html">QWidget</a></span> * QStackedWidget::<span class="name">currentWidget</span> () const</h3>
<p>Returns the current widget, or 0 if there are no child widgets.</p>
<p><b>See also </b><a href="qstackedwidget.html#currentIndex-prop">currentIndex</a>() and <a href="qstackedwidget.html#setCurrentWidget">setCurrentWidget</a>().</p>
<!-- @@@currentWidget -->
<!-- $$$event[overload1]$$$eventQEvent* -->
<h3 class="fn"><a name="event"></a><span class="type">bool</span> QStackedWidget::<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 -->
<!-- $$$indexOf[overload1]$$$indexOfQWidget* -->
<h3 class="fn"><a name="indexOf"></a><span class="type">int</span> QStackedWidget::<span class="name">indexOf</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> ) const</h3>
<p>Returns the index of the given <i>widget</i>, or -1 if the given <i>widget</i> is not a child of the <a href="qstackedwidget.html">QStackedWidget</a>.</p>
<p><b>See also </b><a href="qstackedwidget.html#currentIndex-prop">currentIndex</a>() and <a href="qstackedwidget.html#widget">widget</a>().</p>
<!-- @@@indexOf -->
<!-- $$$insertWidget[overload1]$$$insertWidgetintQWidget* -->
<h3 class="fn"><a name="insertWidget"></a><span class="type">int</span> QStackedWidget::<span class="name">insertWidget</span> ( <span class="type">int</span> <i>index</i>, <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> )</h3>
<p>Inserts the given <i>widget</i> at the given <i>index</i> in the <a href="qstackedwidget.html">QStackedWidget</a>. Ownership of <i>widget</i> is passed on to the <a href="qstackedwidget.html">QStackedWidget</a>. If <i>index</i> is out of range, the <i>widget</i> is appended (in which case it is the actual index of the <i>widget</i> that is returned).</p>
<p>If the <a href="qstackedwidget.html">QStackedWidget</a> was empty before this function is called, the given <i>widget</i> becomes the current widget.</p>
<p>Inserting a new widget at an index less than or equal to the current index will increment the current index, but keep the current widget.</p>
<p><b>See also </b><a href="qstackedwidget.html#addWidget">addWidget</a>(), <a href="qstackedwidget.html#removeWidget">removeWidget</a>(), and <a href="qstackedwidget.html#setCurrentWidget">setCurrentWidget</a>().</p>
<!-- @@@insertWidget -->
<!-- $$$removeWidget[overload1]$$$removeWidgetQWidget* -->
<h3 class="fn"><a name="removeWidget"></a><span class="type">void</span> QStackedWidget::<span class="name">removeWidget</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> )</h3>
<p>Removes <i>widget</i> from the <a href="qstackedwidget.html">QStackedWidget</a>. i.e&#x2e;, <i>widget</i> is <i>not</i> deleted but simply removed from the stacked layout, causing it to be hidden.</p>
<p><b>Note:</b> Ownership of <i>widget</i> reverts to the application.</p>
<p><b>See also </b><a href="qstackedwidget.html#addWidget">addWidget</a>(), <a href="qstackedwidget.html#insertWidget">insertWidget</a>(), and <a href="qstackedwidget.html#currentWidget">currentWidget</a>().</p>
<!-- @@@removeWidget -->
<!-- $$$setCurrentWidget[overload1]$$$setCurrentWidgetQWidget* -->
<h3 class="fn"><a name="setCurrentWidget"></a><span class="type">void</span> QStackedWidget::<span class="name">setCurrentWidget</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> )<tt> [slot]</tt></h3>
<p>Sets the current widget to be the specified <i>widget</i>. The new current widget must already be contained in this stacked widget.</p>
<p><b>See also </b><a href="qstackedwidget.html#currentWidget">currentWidget</a>() and <a href="qstackedwidget.html#currentIndex-prop">setCurrentIndex</a>().</p>
<!-- @@@setCurrentWidget -->
<!-- $$$widget[overload1]$$$widgetint -->
<h3 class="fn"><a name="widget"></a><span class="type"><a href="qwidget.html">QWidget</a></span> * QStackedWidget::<span class="name">widget</span> ( <span class="type">int</span> <i>index</i> ) const</h3>
<p>Returns the widget at the given <i>index</i>, or 0 if there is no such widget.</p>
<p><b>See also </b><a href="qstackedwidget.html#currentWidget">currentWidget</a>() and <a href="qstackedwidget.html#indexOf">indexOf</a>().</p>
<!-- @@@widget -->
<!-- $$$widgetRemoved[overload1]$$$widgetRemovedint -->
<h3 class="fn"><a name="widgetRemoved"></a><span class="type">void</span> QStackedWidget::<span class="name">widgetRemoved</span> ( <span class="type">int</span> <i>index</i> )<tt> [signal]</tt></h3>
<p>This signal is emitted whenever a widget is removed. The widget's <i>index</i> is passed as parameter.</p>
<p><b>See also </b><a href="qstackedwidget.html#removeWidget">removeWidget</a>().</p>
<!-- @@@widgetRemoved -->
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