Qt 4.8: mandelbrotwidget.h Example File (threads/mandelbrot/mandelbrotwidget.h)

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# mandelbrotwidget.h Example File

threads/mandelbrot/mandelbrotwidget.h

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
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     **
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     ** modification, are permitted provided that the following conditions are
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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

     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;
     };

     #endif