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

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     #include <QtGui>

     #include "multipagewidget.h"

     MultiPageWidget::MultiPageWidget(QWidget *parent)
         : QWidget(parent)
     {
         comboBox = new QComboBox();
         comboBox->setObjectName("__qt__passive_comboBox");
         stackWidget = new QStackedWidget();

         connect(comboBox, SIGNAL(activated(int)),
                 this, SLOT(setCurrentIndex(int)));

         layout = new QVBoxLayout();
         layout->addWidget(comboBox);
         layout->addWidget(stackWidget);
         setLayout(layout);
     }

     QSize MultiPageWidget::sizeHint() const
     {
         return QSize(200, 150);
     }

     void MultiPageWidget::addPage(QWidget *page)
     {
         insertPage(count(), page);
     }

     void MultiPageWidget::removePage(int index)
     {
         QWidget *widget = stackWidget->widget(index);
         stackWidget->removeWidget(widget);

         comboBox->removeItem(index);
     }

     int MultiPageWidget::count() const
     {
         return stackWidget->count();
     }

     int MultiPageWidget::currentIndex() const
     {
         return stackWidget->currentIndex();
     }

     void MultiPageWidget::insertPage(int index, QWidget *page)
     {
         page->setParent(stackWidget);

         stackWidget->insertWidget(index, page);

         QString title = page->windowTitle();
         if (title.isEmpty()) {
             title = tr("Page %1").arg(comboBox->count() + 1);
             page->setWindowTitle(title);
         }
         comboBox->insertItem(index, title);
     }

     void MultiPageWidget::setCurrentIndex(int index)
     {
         if (index != currentIndex()) {
             stackWidget->setCurrentIndex(index);
             comboBox->setCurrentIndex(index);
             emit currentIndexChanged(index);
         }
     }

     QWidget* MultiPageWidget::widget(int index)
     {
         return stackWidget->widget(index);
     }

     QString MultiPageWidget::pageTitle() const
     {
         if (const QWidget *currentWidget = stackWidget->currentWidget())
             return currentWidget->windowTitle();
         return QString();
     }

     void MultiPageWidget::setPageTitle(QString const &newTitle)
     {
         comboBox->setItemText(currentIndex(), newTitle);
         if (QWidget *currentWidget = stackWidget->currentWidget())
             currentWidget->setWindowTitle(newTitle);
         emit pageTitleChanged(newTitle);
     }