<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qextensionmanager.cpp --> <title>Qt 4.8: QExtensionManager Class Reference</title> <link rel="stylesheet" type="text/css" href="style/style.css" /> <script src="scripts/jquery.js" type="text/javascript"></script> <script src="scripts/functions.js" type="text/javascript"></script> <link rel="stylesheet" type="text/css" href="style/superfish.css" /> <link rel="stylesheet" type="text/css" href="style/narrow.css" /> <!--[if IE]> <meta name="MSSmartTagsPreventParsing" content="true"> <meta http-equiv="imagetoolbar" content="no"> <![endif]--> <!--[if lt IE 7]> <link rel="stylesheet" type="text/css" href="style/style_ie6.css"> <![endif]--> <!--[if IE 7]> <link rel="stylesheet" type="text/css" href="style/style_ie7.css"> <![endif]--> <!--[if IE 8]> <link rel="stylesheet" type="text/css" href="style/style_ie8.css"> <![endif]--> <script src="scripts/superfish.js" type="text/javascript"></script> <script src="scripts/narrow.js" type="text/javascript"></script> </head> <body class="" onload="CheckEmptyAndLoadList();"> <div class="header" id="qtdocheader"> <div class="content"> <div id="nav-logo"> <a href="index.html">Home</a></div> <a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a> <div id="narrowsearch"></div> <div id="nav-topright"> <ul> <li class="nav-topright-home"><a href="http://qt.digia.com/">Qt HOME</a></li> <li class="nav-topright-dev"><a href="http://qt-project.org/">DEV</a></li> <li class="nav-topright-doc nav-topright-doc-active"><a href="http://qt-project.org/doc/"> DOC</a></li> <li class="nav-topright-blog"><a href="http://blog.qt.digia.com/">BLOG</a></li> </ul> </div> <div id="shortCut"> <ul> <li class="shortCut-topleft-inactive"><span><a href="index.html">Qt 4.8</a></span></li> <li class="shortCut-topleft-active"><a href="http://qt-project.org/doc/">ALL VERSIONS </a></li> </ul> </div> <ul class="sf-menu" id="narrowmenu"> <li><a href="#">API Lookup</a> <ul> <li><a href="classes.html">Class index</a></li> <li><a href="functions.html">Function index</a></li> <li><a href="modules.html">Modules</a></li> <li><a href="namespaces.html">Namespaces</a></li> <li><a href="qtglobal.html">Global Declarations</a></li> <li><a href="qdeclarativeelements.html">QML elements</a></li> </ul> </li> <li><a href="#">Qt Topics</a> <ul> <li><a href="qt-basic-concepts.html">Programming with Qt</a></li> <li><a href="qtquick.html">Device UIs & Qt Quick</a></li> <li><a href="qt-gui-concepts.html">UI Design with Qt</a></li> <li><a href="supported-platforms.html">Supported Platforms</a></li> <li><a href="technology-apis.html">Qt and Key Technologies</a></li> <li><a href="best-practices.html">How-To's and Best Practices</a></li> </ul> </li> <li><a href="#">Examples</a> <ul> <li><a href="all-examples.html">Examples</a></li> <li><a href="tutorials.html">Tutorials</a></li> <li><a href="demos.html">Demos</a></li> <li><a href="qdeclarativeexamples.html">QML Examples</a></li> </ul> </li> </ul> </div> </div> <div class="wrapper"> <div class="hd"> <span></span> </div> <div class="bd group"> <div class="sidebar"> <div class="searchlabel"> Search index:</div> <div class="search" id="sidebarsearch"> <form id="qtdocsearch" action="" onsubmit="return false;"> <fieldset> <input type="text" name="searchstring" id="pageType" value="" /> <div id="resultdialog"> <a href="#" id="resultclose">Close</a> <p id="resultlinks" class="all"><a href="#" id="showallresults">All</a> | <a href="#" id="showapiresults">API</a> | <a href="#" id="showarticleresults">Articles</a> | <a href="#" id="showexampleresults">Examples</a></p> <p id="searchcount" class="all"><span id="resultcount"></span><span id="apicount"></span><span id="articlecount"></span><span id="examplecount"></span> results:</p> <ul id="resultlist" class="all"> </ul> </div> </fieldset> </form> </div> <div class="box first bottombar" id="lookup"> <h2 title="API Lookup"><span></span> API Lookup</h2> <div id="list001" class="list"> <ul id="ul001" > <li class="defaultLink"><a href="classes.html">Class index</a></li> <li class="defaultLink"><a href="functions.html">Function index</a></li> <li class="defaultLink"><a href="modules.html">Modules</a></li> <li class="defaultLink"><a href="namespaces.html">Namespaces</a></li> <li class="defaultLink"><a href="qtglobal.html">Global Declarations</a></li> <li class="defaultLink"><a href="qdeclarativeelements.html">QML elements</a></li> </ul> </div> </div> <div class="box bottombar" id="topics"> <h2 title="Qt Topics"><span></span> Qt Topics</h2> <div id="list002" class="list"> <ul id="ul002" > <li class="defaultLink"><a href="qt-basic-concepts.html">Programming with Qt</a></li> <li class="defaultLink"><a href="qtquick.html">Device UIs & Qt Quick</a></li> <li class="defaultLink"><a href="qt-gui-concepts.html">UI Design with Qt</a></li> <li class="defaultLink"><a href="supported-platforms.html">Supported Platforms</a></li> <li class="defaultLink"><a href="technology-apis.html">Qt and Key Technologies</a></li> <li class="defaultLink"><a href="best-practices.html">How-To's and Best Practices</a></li> </ul> </div> </div> <div class="box" id="examples"> <h2 title="Examples"><span></span> Examples</h2> <div id="list003" class="list"> <ul id="ul003"> <li class="defaultLink"><a href="all-examples.html">Examples</a></li> <li class="defaultLink"><a href="tutorials.html">Tutorials</a></li> <li class="defaultLink"><a href="demos.html">Demos</a></li> <li class="defaultLink"><a href="qdeclarativeexamples.html">QML Examples</a></li> </ul> </div> </div> </div> <div class="wrap"> <div class="toolbar"> <div class="breadcrumb toolblock"> <ul> <li class="first"><a href="index.html">Home</a></li> <!-- Breadcrumbs go here --> <li><a href="modules.html">Modules</a></li> <li><a href="qtdesigner.html">QtDesigner</a></li> <li>QExtensionManager</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="#related-non-members">Related Non-Members</a></li> <li class="level1"><a href="#macros">Macros</a></li> <li class="level1"><a href="#details">Detailed Description</a></li> </ul> </div> <h1 class="title">QExtensionManager Class Reference</h1> <!-- $$$QExtensionManager-brief --> <p>The QExtensionManager class provides extension management facilities for Qt Designer. <a href="#details">More...</a></p> <!-- @@@QExtensionManager --> <pre class="cpp"> <span class="preprocessor">#include <QExtensionManager></span></pre><p><b>Inherits: </b><a href="qobject.html">QObject</a> and <a href="qabstractextensionmanager.html">QAbstractExtensionManager</a>.</p> <ul> <li><a href="qextensionmanager-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"> </td><td class="memItemRight bottomAlign"><b><a href="qextensionmanager.html#QExtensionManager">QExtensionManager</a></b> ( QObject * <i>parent</i> = 0 )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qextensionmanager.html#dtor.QExtensionManager">~QExtensionManager</a></b> ()</td></tr> </table> <a name="reimplemented-public-functions"></a> <h2>Reimplemented Public Functions</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> virtual QObject * </td><td class="memItemRight bottomAlign"><b><a href="qextensionmanager.html#extension">extension</a></b> ( QObject * <i>object</i>, const QString & <i>iid</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qextensionmanager.html#registerExtensions">registerExtensions</a></b> ( QAbstractExtensionFactory * <i>factory</i>, const QString & <i>iid</i> = QString() )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qextensionmanager.html#unregisterExtensions">unregisterExtensions</a></b> ( QAbstractExtensionFactory * <i>factory</i>, const QString & <i>iid</i> = QString() )</td></tr> </table> <ul> <li class="fn">29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li> <li class="fn">3 public functions inherited from <a href="qabstractextensionmanager.html#public-functions">QAbstractExtensionManager</a></li> </ul> <a name="related-non-members"></a> <h2>Related Non-Members</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> T </td><td class="memItemRight bottomAlign"><b><a href="qextensionmanager.html#qt_extension">qt_extension</a></b> ( QAbstractExtensionManager * <i>manager</i>, QObject * <i>object</i> )</td></tr> </table> <a name="macros"></a> <h2>Macros</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qextensionmanager.html#Q_DECLARE_EXTENSION_INTERFACE">Q_DECLARE_EXTENSION_INTERFACE</a></b> ( <i>ExtensionName</i>, <i>Identifier</i> )</td></tr> </table> <h3>Additional Inherited Members</h3> <ul> <li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</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="qobject.html#signals">QObject</a></li> <li class="fn">7 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li> <li class="fn">8 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li> </ul> <a name="details"></a> <!-- $$$QExtensionManager-description --> <div class="descr"> <h2>Detailed Description</h2> <p>The QExtensionManager class provides extension management facilities for Qt Designer.</p> <p>In <i>Qt Designer</i> the extensions are not created until they are required. For that reason, when implementing an extension, 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 extension manager.</p> <p>The registration of an extension factory is typically made in the <a href="qdesignercustomwidgetinterface.html#initialize">QDesignerCustomWidgetInterface::initialize</a>() function:</p> <pre class="cpp"> <span class="type">void</span> MyPlugin<span class="operator">::</span>initialize(<span class="type"><a href="qdesignerformeditorinterface.html">QDesignerFormEditorInterface</a></span> <span class="operator">*</span>formEditor) { <span class="keyword">if</span> (initialized) <span class="keyword">return</span>; <span class="type">QExtensionManager</span> <span class="operator">*</span>manager <span class="operator">=</span> formEditor<span class="operator">-</span><span class="operator">></span>extensionManager(); Q_ASSERT(manager <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>); manager<span class="operator">-</span><span class="operator">></span>registerExtensions(<span class="keyword">new</span> MyExtensionFactory(manager)<span class="operator">,</span> Q_TYPEID(<span class="type"><a href="qdesignertaskmenuextension.html">QDesignerTaskMenuExtension</a></span>)); initialized <span class="operator">=</span> <span class="keyword">true</span>; }</pre> <p>The QExtensionManager is not intended to be instantiated directly. You can retrieve an interface to <i>Qt Designer</i>'s extension manager using the <a href="qdesignerformeditorinterface.html#extensionManager">QDesignerFormEditorInterface::extensionManager</a>() function. A pointer to <i>Qt Designer</i>'s current <a href="qdesignerformeditorinterface.html">QDesignerFormEditorInterface</a> object (<tt>formEditor</tt> in the example above) is provided by the <a href="qdesignercustomwidgetinterface.html#initialize">QDesignerCustomWidgetInterface::initialize</a>() function's parameter. When implementing a custom widget plugin, you must subclass the <a href="qdesignercustomwidgetinterface.html">QDesignerCustomWidgetInterface</a> to expose your plugin to <i>Qt Designer</i>.</p> <p>Then, when an extension is required, <i>Qt Designer</i>'s extension manager 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 the requested extension for the selected object, is found. 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 <a href="qdesignertaskmenuextension.html">QDesignerTaskMenuExtension</a>. <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>For a complete example using the QExtensionManager class, see the <a href="designer-taskmenuextension.html">Task Menu Extension example</a>. The example shows how to create a custom widget plugin for Qt Designer, and how to to use the <a href="qdesignertaskmenuextension.html">QDesignerTaskMenuExtension</a> 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> and <a href="qabstractextensionmanager.html">QAbstractExtensionManager</a>.</p> <!-- @@@QExtensionManager --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$QExtensionManager[overload1]$$$QExtensionManagerQObject* --> <h3 class="fn"><a name="QExtensionManager"></a>QExtensionManager::<span class="name">QExtensionManager</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>parent</i> = 0 )</h3> <p>Constructs an extension manager with the given <i>parent</i>.</p> <!-- @@@QExtensionManager --> <!-- $$$~QExtensionManager[overload1]$$$~QExtensionManager --> <h3 class="fn"><a name="dtor.QExtensionManager"></a>QExtensionManager::<span class="name">~QExtensionManager</span> ()</h3> <p>Destroys the extension manager</p> <!-- @@@~QExtensionManager --> <!-- $$$extension[overload1]$$$extensionQObject*constQString& --> <h3 class="fn"><a name="extension"></a><span class="type"><a href="qobject.html">QObject</a></span> * QExtensionManager::<span class="name">extension</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>object</i>, const <span class="type"><a href="qstring.html">QString</a></span> & <i>iid</i> ) const<tt> [virtual]</tt></h3> <p>Reimplemented from <a href="qabstractextensionmanager.html#extension">QAbstractExtensionManager::extension</a>().</p> <p>Returns the extension specified by <i>iid</i>, for the given <i>object</i>.</p> <!-- @@@extension --> <!-- $$$registerExtensions[overload1]$$$registerExtensionsQAbstractExtensionFactory*constQString& --> <h3 class="fn"><a name="registerExtensions"></a><span class="type">void</span> QExtensionManager::<span class="name">registerExtensions</span> ( <span class="type"><a href="qabstractextensionfactory.html">QAbstractExtensionFactory</a></span> * <i>factory</i>, const <span class="type"><a href="qstring.html">QString</a></span> & <i>iid</i> = QString() )<tt> [virtual]</tt></h3> <p>Reimplemented from <a href="qabstractextensionmanager.html#registerExtensions">QAbstractExtensionManager::registerExtensions</a>().</p> <p>Register the extension specified by the given <i>factory</i> and extension identifier <i>iid</i>.</p> <!-- @@@registerExtensions --> <!-- $$$unregisterExtensions[overload1]$$$unregisterExtensionsQAbstractExtensionFactory*constQString& --> <h3 class="fn"><a name="unregisterExtensions"></a><span class="type">void</span> QExtensionManager::<span class="name">unregisterExtensions</span> ( <span class="type"><a href="qabstractextensionfactory.html">QAbstractExtensionFactory</a></span> * <i>factory</i>, const <span class="type"><a href="qstring.html">QString</a></span> & <i>iid</i> = QString() )<tt> [virtual]</tt></h3> <p>Reimplemented from <a href="qabstractextensionmanager.html#unregisterExtensions">QAbstractExtensionManager::unregisterExtensions</a>().</p> <p>Unregister the extension specified by the given <i>factory</i> and extension identifier <i>iid</i>.</p> <!-- @@@unregisterExtensions --> </div> <div class="relnonmem"> <h2>Related Non-Members</h2> <!-- $$$qt_extension[overload1]$$$qt_extensionQAbstractExtensionManager*QObject* --> <h3 class="fn"><a name="qt_extension"></a><span class="type">T</span> <span class="name">qt_extension</span> ( <span class="type"><a href="qabstractextensionmanager.html">QAbstractExtensionManager</a></span> * <i>manager</i>, <span class="type"><a href="qobject.html">QObject</a></span> * <i>object</i> )</h3> <p>Returns the extension of the given <i>object</i> cast to type T if the object is of type T (or of a subclass); otherwise returns 0. The extension is retrieved using the given extension <i>manager</i>.</p> <pre class="cpp"> <span class="type"><a href="qdesignerpropertysheetextension.html">QDesignerPropertySheetExtension</a></span> <span class="operator">*</span>propertySheet; <span class="type"><a href="qextensionmanager.html">QExtensionManager</a></span> manager <span class="operator">=</span> formEditor<span class="operator">-</span><span class="operator">></span>extensionManager(); propertySheet <span class="operator">=</span> qt_extension<span class="operator"><</span><span class="type"><a href="qdesignerpropertysheetextension.html">QDesignerPropertySheetExtension</a></span><span class="operator">*</span><span class="operator">></span>(manager<span class="operator">,</span> widget); <span class="keyword">if</span>(propertySheet) {<span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>}</pre> <p>When implementing a custom widget plugin, a pointer to <i>Qt Designer</i>'s current <a href="qdesignerformeditorinterface.html">QDesignerFormEditorInterface</a> object (<tt>formEditor</tt>) is provided by the <a href="qdesignercustomwidgetinterface.html#initialize">QDesignerCustomWidgetInterface::initialize</a>() function's parameter.</p> <p>If the widget in the example above doesn't have a defined <a href="qdesignerpropertysheetextension.html">QDesignerPropertySheetExtension</a>, <tt>propertySheet</tt> will be a null pointer.</p> <!-- @@@qt_extension --> </div> <div class="macros"> <h2>Macro Documentation</h2> <!-- $$$Q_DECLARE_EXTENSION_INTERFACE[overload1]$$$Q_DECLARE_EXTENSION_INTERFACE --> <h3 class="fn"><a name="Q_DECLARE_EXTENSION_INTERFACE"></a><span class="name">Q_DECLARE_EXTENSION_INTERFACE</span> ( <i>ExtensionName</i>, <i>Identifier</i> )</h3> <p>Associates the given <i>Identifier</i> (a string literal) to the extension class called <i>ExtensionName</i>. The <i>Identifier</i> must be unique. For example:</p> <pre class="cpp"> Q_DECLARE_EXTENSION_INTERFACE(MyExtension<span class="operator">,</span> <span class="string">"com.mycompany.myproduct.myextension"</span>)</pre> <p>Using the company and product names is a good way to ensure uniqueness of the identifier.</p> <p>When implementing a custom extension class, you must use Q_DECLARE_EXTENSION_INTERFACE() to enable usage of the <a href="qextensionmanager.html#qt_extension">qt_extension</a>() function. The macro is normally located right after the class definition for <i>ExtensionName</i>, in the associated header file.</p> <p><b>See also </b><a href="qtplugin.html#Q_DECLARE_INTERFACE">Q_DECLARE_INTERFACE</a>().</p> <!-- @@@Q_DECLARE_EXTENSION_INTERFACE --> </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. Documentation contributions included herein are the copyrights of their respective owners.</p> <br /> <p> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.</p> <p> Documentation sources may be obtained from <a href="http://www.qt-project.org"> www.qt-project.org</a>.</p> <br /> <p> Digia, Qt and their respective logos are trademarks of Digia Plc in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. <a title="Privacy Policy" href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p> </div> <script src="scripts/functions.js" type="text/javascript"></script> </body> </html>