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<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">QExtensionFactory Class Reference<br /><span class="small-subtitle">[<a href="qtdesigner.html">QtDesigner</a> module]</span>
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<p>The QExtensionFactory class allows you to create a factory that is able to make instances of custom extensions in Qt Designer. <a href="#details">More...</a></p>
<pre> #include <QExtensionFactory></pre><p><b>This class is not part of the Qt GUI Framework Edition.</b></p>
<p>Inherits <a href="qobject.html">QObject</a> and <a href="qabstractextensionfactory.html">QAbstractExtensionFactory</a>.</p>
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<li><a href="qextensionfactory-members.html">List of all members, including inherited members</a></li>
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<h2>Public Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qextensionfactory.html#QExtensionFactory">QExtensionFactory</a></b> ( QExtensionManager * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QExtensionManager * </td><td class="memItemRight" valign="bottom"><b><a href="qextensionfactory.html#extensionManager">extensionManager</a></b> () const</td></tr>
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<h2>Reimplemented Public Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top">virtual QObject * </td><td class="memItemRight" valign="bottom"><b><a href="qextensionfactory.html#extension">extension</a></b> ( QObject * <i>object</i>, const QString & <i>iid</i> ) const</td></tr>
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<li><div bar="2" class="fn"></div>29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
<li><div bar="2" class="fn"></div>1 public function inherited from <a href="qabstractextensionfactory.html#public-functions">QAbstractExtensionFactory</a></li>
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<h2>Protected Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top">virtual QObject * </td><td class="memItemRight" valign="bottom"><b><a href="qextensionfactory.html#createExtension">createExtension</a></b> ( QObject * <i>object</i>, const QString & <i>iid</i>, QObject * <i>parent</i> ) const</td></tr>
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<li><div bar="2" class="fn"></div>7 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
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<li><div class="fn"></div>1 property inherited from <a href="qobject.html#properties">QObject</a></li>
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<h2>Detailed Description</h2>
<p>The QExtensionFactory class allows you to create a factory that is able to make instances of custom extensions in Qt Designer.</p>
<p>In <i>Qt Designer</i> the extensions are not created until they are required. For that reason, when implementing a custom extension, you must also create a QExtensionFactory, 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>The <a href="qextensionmanager.html">QExtensionManager</a> class provides extension management facilities for Qt Designer. When an extension is required, Qt Designer'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 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 Qt Designer: <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>. Qt Designer'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>You can either create a new QExtensionFactory and reimplement the <a href="qextensionfactory.html#createExtension">QExtensionFactory::createExtension</a>() function. For example:</p>
<pre> QObject *ANewExtensionFactory::createExtension(QObject *object,
const QString &iid, QObject *parent) const
{
if (iid != Q_TYPEID(QDesignerContainerExtension))
return 0;
if (MyCustomWidget *widget = qobject_cast<MyCustomWidget*>
(object))
return new MyContainerExtension(widget, parent);
return 0;
}</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 your extension as well. For example:</p>
<pre> QObject *AGeneralExtensionFactory::createExtension(QObject *object,
const QString &iid, QObject *parent) const
{
MyCustomWidget *widget = qobject_cast<MyCustomWidget*>(object);
if (widget && (iid == Q_TYPEID(QDesignerTaskMenuExtension))) {
return new MyTaskMenuExtension(widget, parent);
} else if (widget && (iid == Q_TYPEID(QDesignerContainerExtension))) {
return new MyContainerExtension(widget, parent);
} else {
return 0;
}
}</pre>
<p>For a complete example using the QExtensionFactory 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 Qt Designer's task menu.</p>
<p>See also <a href="qextensionmanager.html">QExtensionManager</a> and <a href="qabstractextensionfactory.html">QAbstractExtensionFactory</a>.</p>
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<h2>Member Function Documentation</h2>
<a name="//apple_ref/cpp/instm/QExtensionFactory/QExtensionFactory"></a>
<h3 class="fn"><a name="QExtensionFactory"></a>QExtensionFactory::QExtensionFactory ( <a href="qextensionmanager.html">QExtensionManager</a> * <i>parent</i> = 0 )</h3>
<p>Constructs an extension factory with the given <i>parent</i>.</p>
<a name="//apple_ref/cpp/instm/QExtensionFactory/createExtension"></a>
<h3 class="fn"><a name="createExtension"></a><a href="qobject.html">QObject</a> * QExtensionFactory::createExtension ( <a href="qobject.html">QObject</a> * <i>object</i>, const <a href="qstring.html">QString</a> & <i>iid</i>, <a href="qobject.html">QObject</a> * <i>parent</i> ) const <tt> [virtual protected]</tt></h3>
<p>Creates an extension specified by <i>iid</i> for the given <i>object</i>. The extension object is created as a child of the specified <i>parent</i>.</p>
<p>See also <a href="qextensionfactory.html#extension">extension</a>().</p>
<a name="//apple_ref/cpp/instm/QExtensionFactory/extension"></a>
<h3 class="fn"><a name="extension"></a><a href="qobject.html">QObject</a> * QExtensionFactory::extension ( <a href="qobject.html">QObject</a> * <i>object</i>, const <a href="qstring.html">QString</a> & <i>iid</i> ) const <tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qabstractextensionfactory.html#extension">QAbstractExtensionFactory::extension</a>().</p>
<p>Returns the extension specified by <i>iid</i> for the given <i>object</i>.</p>
<p>See also <a href="qextensionfactory.html#createExtension">createExtension</a>().</p>
<a name="//apple_ref/cpp/instm/QExtensionFactory/extensionManager"></a>
<h3 class="fn"><a name="extensionManager"></a><a href="qextensionmanager.html">QExtensionManager</a> * QExtensionFactory::extensionManager () const</h3>
<p>Returns the extension manager for the extension factory.</p>
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