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# multipagewidgetplugin.cpp Example File
designer/containerextension/multipagewidgetplugin.cpp

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     #include <QtDesigner/QExtensionFactory>
     #include <QtDesigner/QExtensionManager>
     #include <QtDesigner/QDesignerFormEditorInterface>
     #include <QtDesigner/QDesignerFormWindowInterface>
     #include <QtDesigner/QDesignerContainerExtension>
     #include <QtDesigner/QDesignerPropertySheetExtension>

     #include <QIcon>
     #include <QtPlugin>

     #include "multipagewidget.h"
     #include "multipagewidgetplugin.h"
     #include "multipagewidgetextensionfactory.h"

     MultiPageWidgetPlugin::MultiPageWidgetPlugin(QObject *parent)
         :QObject(parent)
     {
         initialized = false;
     }

     QString MultiPageWidgetPlugin::name() const
     {
         return QLatin1String("MultiPageWidget");
     }

     QString MultiPageWidgetPlugin::group() const
     {
         return QLatin1String("Display Widgets [Examples]");
     }

     QString MultiPageWidgetPlugin::toolTip() const
     {
         return QString();
     }

     QString MultiPageWidgetPlugin::whatsThis() const
     {
         return QString();
     }

     QString MultiPageWidgetPlugin::includeFile() const
     {
         return QLatin1String("multipagewidget.h");
     }

     QIcon MultiPageWidgetPlugin::icon() const
     {
         return QIcon();
     }

     bool MultiPageWidgetPlugin::isContainer() const
     {
         return true;
     }

     QWidget *MultiPageWidgetPlugin::createWidget(QWidget *parent)
     {
         MultiPageWidget *widget = new MultiPageWidget(parent);
         connect(widget, SIGNAL(currentIndexChanged(int)),
                 this, SLOT(currentIndexChanged(int)));
         connect(widget, SIGNAL(pageTitleChanged(const QString &)),
                 this, SLOT(pageTitleChanged(const QString &)));
         return widget;
     }

     bool MultiPageWidgetPlugin::isInitialized() const
     {
         return initialized;
     }

     void MultiPageWidgetPlugin::initialize(QDesignerFormEditorInterface *formEditor)
     {
         if (initialized)
             return;

         QExtensionManager *manager = formEditor->extensionManager();
         QExtensionFactory *factory = new MultiPageWidgetExtensionFactory(manager);

         Q_ASSERT(manager != 0);
         manager->registerExtensions(factory, Q_TYPEID(QDesignerContainerExtension));

         initialized = true;
     }

     QString MultiPageWidgetPlugin::domXml() const
     {
         return QLatin1String("\
     <ui language=\"c++\">\
         <widget class=\"MultiPageWidget\" name=\"multipagewidget\">\
             <widget class=\"QWidget\" name=\"page\" />\
         </widget>\
         <customwidgets>\
             <customwidget>\
                 <class>MultiPageWidget</class>\
                 <extends>QWidget</extends>\
                 <addpagemethod>addPage</addpagemethod>\
             </customwidget>\
         </customwidgets>\
     </ui>");
     }

     void MultiPageWidgetPlugin::currentIndexChanged(int index)
     {
         Q_UNUSED(index);
         MultiPageWidget *widget = qobject_cast<MultiPageWidget*>(sender());
         if (widget) {
             QDesignerFormWindowInterface *form = QDesignerFormWindowInterface::findFormWindow(widget);
             if (form)
                 form->emitSelectionChanged();
         }
     }

     void MultiPageWidgetPlugin::pageTitleChanged(const QString &title)
     {
         Q_UNUSED(title);
         MultiPageWidget *widget = qobject_cast<MultiPageWidget*>(sender());
         if (widget) {
             QWidget *page = widget->widget(widget->currentIndex());
             QDesignerFormWindowInterface *form;
             form = QDesignerFormWindowInterface::findFormWindow(widget);
             if (form) {
                 QDesignerFormEditorInterface *editor = form->core();
                 QExtensionManager *manager = editor->extensionManager();
                 QDesignerPropertySheetExtension *sheet;
                 sheet = qt_extension<QDesignerPropertySheetExtension*>(manager, page);
                 const int propertyIndex = sheet->indexOf(QLatin1String("windowTitle"));
                 sheet->setChanged(propertyIndex, true);
             }
         }
     }

     Q_EXPORT_PLUGIN2(containerextension, MultiPageWidgetPlugin)