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Breadcrumbs go here --> <li><a href="modules.html">Modules</a></li> <li><a href="qtdesigner.html">QtDesigner</a></li> <li>QDesignerContainerExtension</li> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#public-functions">Public Functions</a></li> <li class="level1"><a href="#details">Detailed Description</a></li> </ul> </div> <h1 class="title">QDesignerContainerExtension Class Reference</h1> <!-- $$$QDesignerContainerExtension-brief --> <p>The QDesignerContainerExtension class allows you to add pages to a custom multi-page container in Qt Designer's workspace. <a href="#details">More...</a></p> <!-- @@@QDesignerContainerExtension --> <pre class="cpp"> <span class="preprocessor">#include <QDesignerContainerExtension></span></pre><ul> <li><a href="qdesignercontainerextension-members.html">List of all members, including inherited members</a></li> </ul> <a name="public-functions"></a> <h2>Public Functions</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qdesignercontainerextension.html#dtor.QDesignerContainerExtension">~QDesignerContainerExtension</a></b> ()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qdesignercontainerextension.html#addWidget">addWidget</a></b> ( QWidget * <i>page</i> ) = 0</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual int </td><td class="memItemRight bottomAlign"><b><a href="qdesignercontainerextension.html#count">count</a></b> () const = 0</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual int </td><td class="memItemRight bottomAlign"><b><a href="qdesignercontainerextension.html#currentIndex">currentIndex</a></b> () const = 0</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qdesignercontainerextension.html#insertWidget">insertWidget</a></b> ( int <i>index</i>, QWidget * <i>page</i> ) = 0</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qdesignercontainerextension.html#remove">remove</a></b> ( int <i>index</i> ) = 0</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qdesignercontainerextension.html#setCurrentIndex">setCurrentIndex</a></b> ( int <i>index</i> ) = 0</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual QWidget * </td><td class="memItemRight bottomAlign"><b><a href="qdesignercontainerextension.html#widget">widget</a></b> ( int <i>index</i> ) const = 0</td></tr> </table> <a name="details"></a> <!-- $$$QDesignerContainerExtension-description --> <div class="descr"> <h2>Detailed Description</h2> <p>The QDesignerContainerExtension class allows you to add pages to a custom multi-page container in Qt Designer's workspace.</p> <p>QDesignerContainerExtension provide an interface for creating custom container extensions. A container extension consists of a collection of functions that <i>Qt Designer</i> needs to manage a multi-page container plugin, and a list of the container's pages.</p> <p class="centerAlign"><img src="images/containerextension-example.png" alt="" /></p><p><b>Warning:</b> This is <i>not</i> an extension for container plugins in general, only custom <i>multi-page</i> containers.</p> <p>To create a container extension, your extension class must inherit from both <a href="qobject.html">QObject</a> and QDesignerContainerExtension. For example:</p> <pre class="cpp"> <span class="keyword">class</span> MyContainerExtension : <span class="keyword">public</span> <span class="type"><a href="qobject.html">QObject</a></span><span class="operator">,</span> <span class="keyword">public</span> <span class="type">QDesignerContainerExtension</span> { Q_OBJECT Q_INTERFACES(<span class="type">QDesignerContainerExtension</span>) <span class="keyword">public</span>: MyContainerExtension(MyCustomWidget <span class="operator">*</span>widget<span class="operator">,</span> <span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>); <span class="type">int</span> count() <span class="keyword">const</span>; <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget(<span class="type">int</span> index) <span class="keyword">const</span>; <span class="type">int</span> currentIndex() <span class="keyword">const</span>; <span class="type">void</span> setCurrentIndex(<span class="type">int</span> index); <span class="type">void</span> addWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget); <span class="type">void</span> insertWidget(<span class="type">int</span> index<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget); <span class="type">void</span> remove(<span class="type">int</span> index); <span class="keyword">private</span>: MyCustomWidget <span class="operator">*</span>myWidget; };</pre> <p>Since we are implementing an interface, we must ensure that it's made known to the meta object system using the <a href="qobject.html#Q_INTERFACES">Q_INTERFACES</a>() macro. This enables <i>Qt Designer</i> to use the <a href="qobject.html#qobject_cast">qobject_cast</a>() function to query for supported interfaces using nothing but a <a href="qobject.html">QObject</a> pointer.</p> <p>You must reimplement several functions to enable <i>Qt Designer</i> to manage a custom multi-page container widget: <i>Qt Designer</i> uses <a href="qdesignercontainerextension.html#count">count</a>() to keep track of the number pages in your container, <a href="qdesignercontainerextension.html#widget">widget</a>() to return the page at a given index in the list of the container's pages, and <a href="qdesignercontainerextension.html#currentIndex">currentIndex</a>() to return the list index of the selected page. <i>Qt Designer</i> uses the <a href="qdesignercontainerextension.html#addWidget">addWidget</a>() function to add a given page to the container, expecting it to be appended to the list of pages, while it expects the <a href="qdesignercontainerextension.html#insertWidget">insertWidget</a>() function to add a given page to the container by inserting it at a given index.</p> <p>In <i>Qt Designer</i> the extensions are not created until they are required. For that reason you must also create a <a href="qextensionfactory.html">QExtensionFactory</a>, i.e a class that is able to make an instance of your extension, and register it using <i>Qt Designer</i>'s <a href="qextensionmanager.html">extension manager</a>.</p> <p>When a container extension is required, <i>Qt Designer</i>'s <a href="qextensionmanager.html">extension manager</a> will run through all its registered factories calling <a href="qextensionfactory.html#createExtension">QExtensionFactory::createExtension</a>() for each until the first one that is able to create a container extension, is found. This factory will then create the extension for the plugin.</p> <p>There are four available types of extensions in <i>Qt Designer</i>: QDesignerContainerExtension , <a href="qdesignermembersheetextension.html">QDesignerMemberSheetExtension</a>, <a href="qdesignerpropertysheetextension.html">QDesignerPropertySheetExtension</a> and <a href="qdesignertaskmenuextension.html">QDesignerTaskMenuExtension</a>. <i>Qt Designer</i>'s behavior is the same whether the requested extension is associated with a multi page container, a member sheet, a property sheet or a task menu.</p> <p>The <a href="qextensionfactory.html">QExtensionFactory</a> class provides a standard extension factory, and can also be used as an interface for custom extension factories. You can either create a new <a href="qextensionfactory.html">QExtensionFactory</a> and reimplement the <a href="qextensionfactory.html#createExtension">QExtensionFactory::createExtension</a>() function. For example:</p> <pre class="cpp"> <span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>ANewExtensionFactory<span class="operator">::</span>createExtension(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>object<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>iid<span class="operator">,</span> <span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent) <span class="keyword">const</span> { <span class="keyword">if</span> (iid <span class="operator">!</span><span class="operator">=</span> Q_TYPEID(<span class="type">QDesignerContainerExtension</span>)) <span class="keyword">return</span> <span class="number">0</span>; <span class="keyword">if</span> (MyCustomWidget <span class="operator">*</span>widget <span class="operator">=</span> qobject_cast<span class="operator"><</span>MyCustomWidget<span class="operator">*</span><span class="operator">></span> (object)) <span class="keyword">return</span> <span class="keyword">new</span> MyContainerExtension(widget<span class="operator">,</span> parent); <span class="keyword">return</span> <span class="number">0</span>; }</pre> <p>Or you can use an existing factory, expanding the <a href="qextensionfactory.html#createExtension">QExtensionFactory::createExtension</a>() function to make the factory able to create a container extension as well. For example:</p> <pre class="cpp"> <span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>AGeneralExtensionFactory<span class="operator">::</span>createExtension(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>object<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>iid<span class="operator">,</span> <span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent) <span class="keyword">const</span> { MyCustomWidget <span class="operator">*</span>widget <span class="operator">=</span> qobject_cast<span class="operator"><</span>MyCustomWidget<span class="operator">*</span><span class="operator">></span>(object); <span class="keyword">if</span> (widget <span class="operator">&</span><span class="operator">&</span> (iid <span class="operator">=</span><span class="operator">=</span> Q_TYPEID(<span class="type"><a href="qdesignertaskmenuextension.html">QDesignerTaskMenuExtension</a></span>))) { <span class="keyword">return</span> <span class="keyword">new</span> MyTaskMenuExtension(widget<span class="operator">,</span> parent); } <span class="keyword">else</span> <span class="keyword">if</span> (widget <span class="operator">&</span><span class="operator">&</span> (iid <span class="operator">=</span><span class="operator">=</span> Q_TYPEID(<span class="type">QDesignerContainerExtension</span>))) { <span class="keyword">return</span> <span class="keyword">new</span> MyContainerExtension(widget<span class="operator">,</span> parent); } <span class="keyword">else</span> { <span class="keyword">return</span> <span class="number">0</span>; } }</pre> <p>For a complete example using the QDesignerContainerExtension class, see the <a href="designer-containerextension.html">Container Extension example</a>. The example shows how to create a custom multi-page plugin for <i>Qt Designer</i>.</p> </div> <p><b>See also </b><a href="qextensionfactory.html">QExtensionFactory</a>, <a href="qextensionmanager.html">QExtensionManager</a>, and <a href="designer-creating-custom-widgets-extensions.html">Creating Custom Widget Extensions</a>.</p> <!-- @@@QDesignerContainerExtension --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$~QDesignerContainerExtension[overload1]$$$~QDesignerContainerExtension --> <h3 class="fn"><a name="dtor.QDesignerContainerExtension"></a>QDesignerContainerExtension::<span class="name">~QDesignerContainerExtension</span> ()<tt> [virtual]</tt></h3> <p>Destroys the extension.</p> <!-- @@@~QDesignerContainerExtension --> <!-- $$$addWidget[overload1]$$$addWidgetQWidget* --> <h3 class="fn"><a name="addWidget"></a><span class="type">void</span> QDesignerContainerExtension::<span class="name">addWidget</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>page</i> )<tt> [pure virtual]</tt></h3> <p>Adds the given <i>page</i> to the container by appending it to the extension's list of pages.</p> <p><b>See also </b><a href="qdesignercontainerextension.html#insertWidget">insertWidget</a>(), <a href="qdesignercontainerextension.html#remove">remove</a>(), and <a href="qdesignercontainerextension.html#widget">widget</a>().</p> <!-- @@@addWidget --> <!-- $$$count[overload1]$$$count --> <h3 class="fn"><a name="count"></a><span class="type">int</span> QDesignerContainerExtension::<span class="name">count</span> () const<tt> [pure virtual]</tt></h3> <p>Returns the number of pages in the container.</p> <!-- @@@count --> <!-- $$$currentIndex[overload1]$$$currentIndex --> <h3 class="fn"><a name="currentIndex"></a><span class="type">int</span> QDesignerContainerExtension::<span class="name">currentIndex</span> () const<tt> [pure virtual]</tt></h3> <p>Returns the index of the currently selected page in the container.</p> <p><b>See also </b><a href="qdesignercontainerextension.html#setCurrentIndex">setCurrentIndex</a>().</p> <!-- @@@currentIndex --> <!-- $$$insertWidget[overload1]$$$insertWidgetintQWidget* --> <h3 class="fn"><a name="insertWidget"></a><span class="type">void</span> QDesignerContainerExtension::<span class="name">insertWidget</span> ( <span class="type">int</span> <i>index</i>, <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>page</i> )<tt> [pure virtual]</tt></h3> <p>Adds the given <i>page</i> to the container by inserting it at the given <i>index</i> in the extension's list of pages.</p> <p><b>See also </b><a href="qdesignercontainerextension.html#addWidget">addWidget</a>(), <a href="qdesignercontainerextension.html#remove">remove</a>(), and <a href="qdesignercontainerextension.html#widget">widget</a>().</p> <!-- @@@insertWidget --> <!-- $$$remove[overload1]$$$removeint --> <h3 class="fn"><a name="remove"></a><span class="type">void</span> QDesignerContainerExtension::<span class="name">remove</span> ( <span class="type">int</span> <i>index</i> )<tt> [pure virtual]</tt></h3> <p>Removes the page at the given <i>index</i> from the extension's list of pages.</p> <p><b>See also </b><a href="qdesignercontainerextension.html#addWidget">addWidget</a>() and <a href="qdesignercontainerextension.html#insertWidget">insertWidget</a>().</p> <!-- @@@remove --> <!-- $$$setCurrentIndex[overload1]$$$setCurrentIndexint --> <h3 class="fn"><a name="setCurrentIndex"></a><span class="type">void</span> QDesignerContainerExtension::<span class="name">setCurrentIndex</span> ( <span class="type">int</span> <i>index</i> )<tt> [pure virtual]</tt></h3> <p>Sets the currently selected page in the container to be the page at the given <i>index</i> in the extension's list of pages.</p> <p><b>See also </b><a href="qdesignercontainerextension.html#currentIndex">currentIndex</a>().</p> <!-- @@@setCurrentIndex --> <!-- $$$widget[overload1]$$$widgetint --> <h3 class="fn"><a name="widget"></a><span class="type"><a href="qwidget.html">QWidget</a></span> * QDesignerContainerExtension::<span class="name">widget</span> ( <span class="type">int</span> <i>index</i> ) const<tt> [pure virtual]</tt></h3> <p>Returns the page at the given <i>index</i> in the extension's list of pages.</p> <p><b>See also </b><a href="qdesignercontainerextension.html#addWidget">addWidget</a>() and <a href="qdesignercontainerextension.html#insertWidget">insertWidget</a>().</p> <!-- @@@widget --> </div> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd. 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