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scribblewidget.h Example File
^{qtopiacore/mousecalibration/scribblewidget.h}

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    #ifndef SCRIBBLEWIDGET_H
    #define SCRIBBLEWIDGET_H

    #include <QLabel>
    #include <QMouseEvent>
    #include <QResizeEvent>
    #include <QImage>
    #include <QPainter>

    class ScribbleWidget : public QWidget
    {
    public:
        ScribbleWidget(QWidget *parent = 0);

        void resizeEvent(QResizeEvent *e);
        void mousePressEvent(QMouseEvent *event);
        void mouseMoveEvent(QMouseEvent *event);
        void mouseReleaseEvent(QMouseEvent *event);
        void paintEvent(QPaintEvent *);

    private:
        void drawLineTo(const QPoint &endPoint);

    private:
        bool scribbling;
        QPoint lastPoint;
        QImage image;
    };

    #endif // SCRIBBLEWIDGET_H