text: /****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
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  ** This file is part of the examples of the Qt Toolkit.
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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"
  
  //! [0]
  MultiPageWidgetPlugin::MultiPageWidgetPlugin(QObject *parent)
      : QObject(parent)
  {
  }
  
  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();
  }
  
  //! [0] //! [1]
  bool MultiPageWidgetPlugin::isContainer() const
  {
      return true;
  }
  
  //! [1] //! [2]
  QWidget *MultiPageWidgetPlugin::createWidget(QWidget *parent)
  {
      MultiPageWidget *widget = new MultiPageWidget(parent);
      connect(widget, &MultiPageWidget::currentIndexChanged,
              this, &MultiPageWidgetPlugin::currentIndexChanged);
      connect(widget, &MultiPageWidget::pageTitleChanged,
              this, &MultiPageWidgetPlugin::pageTitleChanged);
      return widget;
  }
  
  //! [2] //! [3]
  bool MultiPageWidgetPlugin::isInitialized() const
  {
      return initialized;
  }
  //! [3]
  
  //! [4]
  void MultiPageWidgetPlugin::initialize(QDesignerFormEditorInterface *formEditor)
  {
      if (initialized)
          return;
  //! [4]
  
  //! [5]
      QExtensionManager *manager = formEditor->extensionManager();
  //! [5] //! [6]
      QExtensionFactory *factory = new MultiPageWidgetExtensionFactory(manager);
  
      Q_ASSERT(manager != 0);
      manager->registerExtensions(factory, Q_TYPEID(QDesignerContainerExtension));
  
      initialized = true;
  }
  //! [6]
  
  //! [7]
  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>");
  }
  //! [7]
  
  //! [8]
  void MultiPageWidgetPlugin::currentIndexChanged(int index)
  {
      Q_UNUSED(index);
      MultiPageWidget *widget = qobject_cast<MultiPageWidget*>(sender());
  //! [8] //! [9]
      if (widget) {
          QDesignerFormWindowInterface *form = QDesignerFormWindowInterface::findFormWindow(widget);
          if (form)
              form->emitSelectionChanged();
      }
  }
  //! [9]
  
  //! [10]
  void MultiPageWidgetPlugin::pageTitleChanged(const QString &title)
  {
      Q_UNUSED(title);
      MultiPageWidget *widget = qobject_cast<MultiPageWidget*>(sender());
  //! [10] //! [11]
      if (widget) {
          QWidget *page = widget->widget(widget->currentIndex());
          QDesignerFormWindowInterface *form;
          form = QDesignerFormWindowInterface::findFormWindow(widget);
  //! [11]
          if (form) {
  //! [12]
              QDesignerFormEditorInterface *editor = form->core();
              QExtensionManager *manager = editor->extensionManager();
  //! [12] //! [13]
              QDesignerPropertySheetExtension *sheet;
              sheet = qt_extension<QDesignerPropertySheetExtension*>(manager, page);
              const int propertyIndex = sheet->indexOf(QLatin1String("windowTitle"));
              sheet->setChanged(propertyIndex, true);
          }
      }
  }
  
  //! [13]
  