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displaywidget.h Example File
tools/qtdemo/displaywidget.h

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    #ifndef DISPLAYWIDGET_H
    #define DISPLAYWIDGET_H

    #include <QWidget>

    class DisplayShape;

    class DisplayWidget : public QWidget
    {
        Q_OBJECT

    public:
        DisplayWidget(QWidget *parent = 0);
        QSize minimumSizeHint() const;
        DisplayShape *shape(int index) const;
        int shapesCount() const;
        void appendShape(DisplayShape *shape);
        void enableUpdates();
        void insertShape(int position, DisplayShape *shape);
        void reset();

    protected:
        void mouseMoveEvent(QMouseEvent *event);
        void mousePressEvent(QMouseEvent *event);
        void paintEvent(QPaintEvent *event);

    signals:
        void actionRequested(const QString &name);
        void displayEmpty();
        void categoryRequested(const QString &name);
        void documentationRequested(const QString &name);
        void exampleRequested(const QString &name);
        void launchRequested(const QString &name);

    private slots:
        void updateShapes();

    private:
        bool empty;
        bool emptying;
        QList<DisplayShape*> shapes;
        QTimer *timer;
    };

    #endif


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Qt 4.0.0