qt5base-lts/examples/threads/mandelbrot/mandelbrotwidget.h

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#ifndef MANDELBROTWIDGET_H
#define MANDELBROTWIDGET_H

#include <QPixmap>
#include <QWidget>
#include "renderthread.h"

#if defined(Q_WS_S60) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)
#include <QPushButton>

class ZoomButton : public QPushButton
{
    Q_OBJECT
public:
    ZoomButton(const QString &text, double zoomFactor, QWidget *parent = NULL)
        : QPushButton(text, parent), m_ZoomFactor(zoomFactor)
    {
        connect(this, SIGNAL(clicked()), this, SLOT(handleClick()));
    }

signals:
    void zoom(double zoomFactor);

private slots:
    void handleClick()
    {
        emit zoom(m_ZoomFactor);
    }

private:
    const double m_ZoomFactor;
};
#endif

//! [0]
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);
    void zoom(double zoomFactor);

private:
    void scroll(int deltaX, int deltaY);

    RenderThread thread;
    QPixmap pixmap;
    QPoint pixmapOffset;
    QPoint lastDragPos;
    double centerX;
    double centerY;
    double pixmapScale;
    double curScale;
};
//! [0]

#endif