qwidgets.cpp Example File

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 #include <QtDeclarative/QDeclarativeExtensionPlugin>
 #include <QtDeclarative/qdeclarative.h>
 #include <QtGui/QGraphicsProxyWidget>
 #include <QtGui/QPushButton>
 #include <QDebug>

 class MyPushButton : public QGraphicsProxyWidget
 {
     Q_OBJECT
     Q_PROPERTY(QString text READ text WRITE setText NOTIFY textChanged)

 public:
     MyPushButton(QGraphicsItem* parent = 0)
         : QGraphicsProxyWidget(parent)
     {
         widget = new QPushButton("MyPushButton");
         widget->setAttribute(Qt::WA_NoSystemBackground);
         setWidget(widget);

         QObject::connect(widget, SIGNAL(clicked(bool)), this, SIGNAL(clicked(bool)));
     }

     QString text() const
     {
         return widget->text();
     }

     void setText(const QString& text)
     {
         if (text != widget->text()) {
             widget->setText(text);
             emit textChanged();
         }
     }

 Q_SIGNALS:
     void clicked(bool);
     void textChanged();

 private:
     QPushButton *widget;
 };

 class QWidgetsPlugin : public QDeclarativeExtensionPlugin
 {
     Q_OBJECT
 public:
     void registerTypes(const char *uri)
     {
         qmlRegisterType<MyPushButton>(uri, 1, 0, "MyPushButton");
     }
 };

 #include "qwidgets.moc"

 Q_EXPORT_PLUGIN2(qmlqwidgetsplugin, QWidgetsPlugin);