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Breadcrumbs go here --> <li><a href="modules.html">Modules</a></li> <li><a href="qtdesigner.html">QtDesigner</a></li> <li>QDesignerTaskMenuExtension</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">QDesignerTaskMenuExtension Class Reference</h1> <!-- $$$QDesignerTaskMenuExtension-brief --> <p>The QDesignerTaskMenuExtension class allows you to add custom menu entries to Qt Designer's task menu. <a href="#details">More...</a></p> <!-- @@@QDesignerTaskMenuExtension --> <pre class="cpp"> <span class="preprocessor">#include <QDesignerTaskMenuExtension></span></pre><ul> <li><a href="qdesignertaskmenuextension-members.html">List of all members, including inherited members</a></li> </ul> <a name="public-functions"></a> <h2>Public Functions</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qdesignertaskmenuextension.html#dtor.QDesignerTaskMenuExtension">~QDesignerTaskMenuExtension</a></b> ()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual QAction * </td><td class="memItemRight bottomAlign"><b><a href="qdesignertaskmenuextension.html#preferredEditAction">preferredEditAction</a></b> () const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual QList<QAction *> </td><td class="memItemRight bottomAlign"><b><a href="qdesignertaskmenuextension.html#taskActions">taskActions</a></b> () const = 0</td></tr> </table> <a name="details"></a> <!-- $$$QDesignerTaskMenuExtension-description --> <div class="descr"> <h2>Detailed Description</h2> <p>The QDesignerTaskMenuExtension class allows you to add custom menu entries to Qt Designer's task menu.</p> <p>QDesignerTaskMenuExtension provides an interface for creating custom task menu extensions. It is typically used to create task menu entries that are specific to a plugin in <i>Qt Designer</i>.</p> <p><i>Qt Designer</i> uses the QDesignerTaskMenuExtension to feed its task menu. Whenever a task menu is requested, <i>Qt Designer</i> will query for the selected widget's task menu extension.</p> <p class="centerAlign"><img src="images/taskmenuextension-example-faded.png" alt="" /></p><p>A task menu extension is a collection of QActions. The actions appear as entries in the task menu when the plugin with the specified extension is selected. The image above shows the custom <b>Edit State...</b> action which appears in addition to <i>Qt Designer</i>'s default task menu entries: <b>Cut</b>, <b>Copy</b>, <b>Paste</b> etc.</p> <p>To create a custom task menu extension, your extension class must inherit from both <a href="qobject.html">QObject</a> and QDesignerTaskMenuExtension. For example:</p> <pre class="cpp"> <span class="keyword">class</span> MyTaskMenuExtension : <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">QDesignerTaskMenuExtension</span> { Q_OBJECT Q_INTERFACES(<span class="type">QDesignerTaskMenuExtension</span>) <span class="keyword">public</span>: MyTaskMenuExtension(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="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>preferredEditAction() <span class="keyword">const</span>; <span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span><span class="operator">></span> taskActions() <span class="keyword">const</span>; <span class="keyword">private</span> <span class="keyword">slots</span>: <span class="type">void</span> mySlot(); <span class="keyword">private</span>: MyCustomWidget <span class="operator">*</span>widget; <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>myAction; };</pre> <p>Since we are implementing an interface, we must ensure that it is 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 the <a href="qdesignertaskmenuextension.html#taskActions">taskActions</a>() function to return a list of actions that will be included in <i>Qt Designer</i> task menu. Optionally, you can reimplement the <a href="qdesignertaskmenuextension.html#preferredEditAction">preferredEditAction</a>() function to set the action that is invoked when selecting your plugin and pressing <b>F2</b>. The preferred edit action must be one of the actions returned by <a href="qdesignertaskmenuextension.html#taskActions">taskActions</a>() and, if it's not defined, pressing the <b>F2</b> key will simply be ignored.</p> <p>In <i>Qt Designer</i>, extensions are not created until they are required. A task menu extension, for example, is created when you click the right mouse button over a widget in <i>Qt Designer</i>'s workspace. For that reason you must also construct an extension factory, using either <a href="qextensionfactory.html">QExtensionFactory</a> or a subclass, and register it using <i>Qt Designer</i>'s <a href="qextensionmanager.html">extension manager</a>.</p> <p>When a task menu 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 it finds one that is able to create a task menu extension for the selected widget. This factory will then make an instance of the extension.</p> <p>There are four available types of extensions in <i>Qt Designer</i>: <a href="qdesignercontainerextension.html">QDesignerContainerExtension</a>, <a href="qdesignermembersheetextension.html">QDesignerMemberSheetExtension</a>, <a href="qdesignerpropertysheetextension.html">QDesignerPropertySheetExtension</a>, and QDesignerTaskMenuExtension. <i>Qt Designer</i>'s behavior is the same whether the requested extension is associated with a 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">QDesignerTaskMenuExtension</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> MyTaskMenuExtension(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 task menu 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="qdesignercontainerextension.html">QDesignerContainerExtension</a></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">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">QDesignerTaskMenuExtension</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">return</span> <span class="number">0</span>; } }</pre> <p>For a complete example using the QDesignerTaskMenuExtension class, see the <a href="designer-taskmenuextension.html">Task Menu Extension example</a>. The example shows how to create a custom widget plugin for <i>Qt Designer</i>, and how to to use the QDesignerTaskMenuExtension class to add custom items to <i>Qt Designer</i>'s task menu.</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> <!-- @@@QDesignerTaskMenuExtension --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$~QDesignerTaskMenuExtension[overload1]$$$~QDesignerTaskMenuExtension --> <h3 class="fn"><a name="dtor.QDesignerTaskMenuExtension"></a>QDesignerTaskMenuExtension::<span class="name">~QDesignerTaskMenuExtension</span> ()<tt> [virtual]</tt></h3> <p>Destroys the task menu extension.</p> <!-- @@@~QDesignerTaskMenuExtension --> <!-- $$$preferredEditAction[overload1]$$$preferredEditAction --> <h3 class="fn"><a name="preferredEditAction"></a><span class="type"><a href="qaction.html">QAction</a></span> * QDesignerTaskMenuExtension::<span class="name">preferredEditAction</span> () const<tt> [virtual]</tt></h3> <p>Returns the action that is invoked when selecting a plugin with the specified extension and pressing <b>F2</b>.</p> <p>The action must be one of the actions returned by <a href="qdesignertaskmenuextension.html#taskActions">taskActions</a>().</p> <!-- @@@preferredEditAction --> <!-- $$$taskActions[overload1]$$$taskActions --> <h3 class="fn"><a name="taskActions"></a><span class="type"><a href="qlist.html">QList</a></span><<span class="type"><a href="qaction.html">QAction</a></span> *> QDesignerTaskMenuExtension::<span class="name">taskActions</span> () const<tt> [pure virtual]</tt></h3> <p>Returns the task menu extension as a list of actions which will be included in <i>Qt Designer</i>'s task menu when a plugin with the specified extension is selected.</p> <p>The function must be reimplemented to add actions to the list.</p> <!-- @@@taskActions --> </div> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its subsidiaries. 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