Qt 4.5: scribblearea.h Example File (widgets/scribble/scribblearea.h)

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# scribblearea.h Example File
widgets/scribble/scribblearea.h

     /****************************************************************************
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     ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
     ** Contact: Qt Software Information (qt-info@nokia.com)
     **
     ** This file is part of the example classes of the Qt Toolkit.
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     ** GNU General Public License Usage
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     ** General Public License version 3.0 as published by the Free Software
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     #ifndef SCRIBBLEAREA_H
     #define SCRIBBLEAREA_H

     #include <QColor>
     #include <QImage>
     #include <QPoint>
     #include <QWidget>

     class ScribbleArea : public QWidget
     {
         Q_OBJECT

     public:
         ScribbleArea(QWidget *parent = 0);

         bool openImage(const QString &fileName);
         bool saveImage(const QString &fileName, const char *fileFormat);
         void setPenColor(const QColor &newColor);
         void setPenWidth(int newWidth);

         bool isModified() const { return modified; }
         QColor penColor() const { return myPenColor; }
         int penWidth() const { return myPenWidth; }

     public slots:
         void clearImage();
         void print();

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

     private:
         void drawLineTo(const QPoint &endPoint);
         void resizeImage(QImage *image, const QSize &newSize);

         bool modified;
         bool scribbling;
         int myPenWidth;
         QColor myPenColor;
         QImage image;
         QPoint lastPoint;
     };

     #endif