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mandelbrotwidget.h Example File
^{threads/mandelbrot/mandelbrotwidget.h}

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    ** This file is part of the documentation of the Qt Toolkit.
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    #ifndef MANDELBROTWIDGET_H
    #define MANDELBROTWIDGET_H

    #include <QPixmap>
    #include <QWidget>

    #include "renderthread.h"

    class MandelbrotWidget : public QWidget
    {
        Q_OBJECT

    public:
        MandelbrotWidget(QWidget *parent = 0);

    protected:
        void paintEvent(QPaintEvent *event);
        void resizeEvent(QResizeEvent *event);
        void keyPressEvent(QKeyEvent *event);
        void wheelEvent(QWheelEvent *event);
        void mousePressEvent(QMouseEvent *event);
        void mouseMoveEvent(QMouseEvent *event);
        void mouseReleaseEvent(QMouseEvent *event);

    private slots:
        void updatePixmap(const QImage &image, double scaleFactor);

    private:
        void zoom(double zoomFactor);
        void scroll(int deltaX, int deltaY);

        RenderThread thread;
        QPixmap pixmap;
        QPoint pixmapOffset;
        QPoint lastDragPos;
        double centerX;
        double centerY;
        double pixmapScale;
        double curScale;
    };

    #endif