Qt 4.0: scribblearea.h Example File (widgets/scribble/scribblearea.h)

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

        /****************************************************************************
        **
        ** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
    ** General Public Licensing requirements will be met:
    ** http://www.trolltech.com/products/qt/opensource.html
    **
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    ** review the following information:
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        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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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();

        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