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

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     #include "multipagewidgetextensionfactory.h"
     #include "multipagewidgetcontainerextension.h"
     #include "multipagewidget.h"

     MultiPageWidgetExtensionFactory::MultiPageWidgetExtensionFactory(QExtensionManager *parent)
         : QExtensionFactory(parent)
     {}

     QObject *MultiPageWidgetExtensionFactory::createExtension(QObject *object,
                                                               const QString &iid,
                                                               QObject *parent) const
     {
         MultiPageWidget *widget = qobject_cast<MultiPageWidget*>(object);

         if (widget && (iid == Q_TYPEID(QDesignerContainerExtension))) {
             return new MultiPageWidgetContainerExtension(widget, parent);
         } else {
             return 0;
         }
     }