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<td >Qt 5.9</td><td ><a href="qtdesigner-manual.html">Qt Designer Manual</a></td><td >Creating and Using Components for Qt Designer</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#creating-custom-widget-plugins">Creating Custom Widget Plugins</a></li>
<li class="level1"><a href="#retrieving-access-to-qt-designer-components">Retrieving Access to <i>Qt Designer</i> Components</a></li>
<li class="level1"><a href="#creating-user-interfaces-at-run-time">Creating User Interfaces at Run-Time</a></li>
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<h1 class="title">Creating and Using Components for Qt Designer</h1>
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<a name="creating-custom-widget-plugins"></a>
<h2 id="creating-custom-widget-plugins">Creating Custom Widget Plugins</h2>
<p>When implementing a custom widget plugin for <i>Qt Designer</i>, you must subclass <a href="qdesignercustomwidgetinterface.html">QDesignerCustomWidgetInterface</a> to expose your custom widget to <i>Qt Designer</i>. A single custom widget plugin is built as a separate library. If you want to include several custom widget plugins in the same library, you must in addition subclass <a href="qdesignercustomwidgetcollectioninterface.html">QDesignerCustomWidgetCollectionInterface</a>.</p>
<p>To provide your custom widget plugin with the expected behavior and functionality within <i>Qt Designer</i>'s workspace you can subclass the associated extension classes:</p>
<p>The <a href="qdesignercontainerextension.html">QDesignerContainerExtension</a> class allows you to add pages to a custom multi-page container. The <a href="qdesignertaskmenuextension.html">QDesignerTaskMenuExtension</a> class allows you to add custom menu entries to <i>Qt Designer</i>'s task menu. The <a href="qdesignermembersheetextension.html">QDesignerMemberSheetExtension</a> class allows you to manipulate a widget's member functions which is displayed when configuring connections using <i>Qt Designer</i>'s mode for editing signals and slots. And finally, the <a href="qdesignerpropertysheetextension.html">QDesignerPropertySheetExtension</a> class allows you to manipulate a widget's properties which is displayed in <i>Qt Designer</i>'s property editor.</p>
<p class="centerAlign"><img src="images/qtdesignerextensions.png" alt="" /></p><p>In <i>Qt Designer</i> the extensions are not created until they are required. For that reason, when implementing extensions, you must also subclass <a href="qextensionfactory.html">QExtensionFactory</a>, i.e create a class that is able to make instances of your extensions. In addition, you must make <i>Qt Designer</i>'s extension manager register your factory; the extension manager controls the construction of extensions as they are required, and you can access it through <a href="qdesignerformeditorinterface.html">QDesignerFormEditorInterface</a> and <a href="qextensionmanager.html">QExtensionManager</a>.</p>
<p>For a complete example creating a custom widget plugin with an extension, see the <a href="qtdesigner-taskmenuextension-example.html">Task Menu Extension</a> or <a href="qtdesigner-containerextension-example.html">Container Extension</a> examples.</p>
<a name="retrieving-access-to-qt-designer-components"></a>
<h2 id="retrieving-access-to-qt-designer-components">Retrieving Access to <i>Qt Designer</i> Components</h2>
<p>The purpose of the classes mentioned in this section is to provide access to <i>Qt Designer</i>'s components, managers and workspace, and they are not intended to be instantiated directly.</p>
<p><i>Qt Designer</i> is composed by several components. It has an action editor, a property editor, widget box and object inspector which you can view in its workspace.</p>
<p class="centerAlign"><img src="images/qtdesignerscreenshot.png" alt="" /></p><p><i>Qt Designer</i> also has an object that works behind the scene; it contains the logic that integrates all of <i>Qt Designer</i>'s components into a coherent application. You can access this object, using the <a href="qdesignerformeditorinterface.html">QDesignerFormEditorInterface</a>, to retrieve interfaces to <i>Qt Designer</i>'s components:</p>
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<li><a href="qdesigneractioneditorinterface.html">QDesignerActionEditorInterface</a></li>
<li><a href="qdesignerobjectinspectorinterface.html">QDesignerObjectInspectorInterface</a></li>
<li><a href="qdesignerpropertyeditorinterface.html">QDesignerPropertyEditorInterface</a></li>
<li><a href="qdesignerwidgetboxinterface.html">QDesignerWidgetBoxInterface</a></li>
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<p>In addition, you can use <a href="qdesignerformeditorinterface.html">QDesignerFormEditorInterface</a> to retrieve interfaces to <i>Qt Designer</i>'s extension manager (<a href="qextensionmanager.html">QExtensionManager</a>) and form window manager (<a href="qdesignerformwindowmanagerinterface.html">QDesignerFormWindowManagerInterface</a>). The extension manager controls the construction of extensions as they are required, while the form window manager controls the form windows appearing in <i>Qt Designer</i>'s workspace.</p>
<p>Once you have an interface to <i>Qt Designer</i>'s form window manager (<a href="qdesignerformwindowmanagerinterface.html">QDesignerFormWindowManagerInterface</a>), you also have access to all the form windows currently appearing in <i>Qt Designer</i>'s workspace: The <a href="qdesignerformwindowinterface.html">QDesignerFormWindowInterface</a> class allows you to query and manipulate the form windows, and it provides an interface to the form windows' cursors. <a href="qdesignerformwindowcursorinterface.html">QDesignerFormWindowCursorInterface</a> is a convenience class allowing you to query and modify a given form window's widget selection, and in addition modify the properties of all the form's widgets.</p>
<a name="creating-user-interfaces-at-run-time"></a>
<h2 id="creating-user-interfaces-at-run-time">Creating User Interfaces at Run-Time</h2>
<p>The <code>QtDesigner</code> module contains the <a href="qformbuilder.html">QFormBuilder</a> class that provides a mechanism for dynamically creating user interfaces at run-time, based on UI files created with <i>Qt Designer</i>. This class is typically used by custom components and applications that embed <i>Qt Designer</i>. Standalone applications that need to dynamically generate user interfaces at run-time use the QUiLoader class, found in the QtUiTools module.</p>
<p>For a complete example using QUiLoader, see the <a href="qtdesigner-calculatorbuilder-example.html">Calculator Builder example</a>.</p>
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<p><b>See also </b><a href="qtdesigner-manual.html">Qt Designer Manual</a> and Qt UI Tools.</p>
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