Qt 4.0: paintarea.h Example File (tools/plugandpaint/paintarea.h)

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# paintarea.h Example File
tools/plugandpaint/paintarea.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
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    ** 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 PAINTAREA_H
        #define PAINTAREA_H

        #include <QColor>
        #include <QImage>
        #include <QPainterPath>
        #include <QWidget>

        class BrushInterface;

        class PaintArea : public QWidget
        {
            Q_OBJECT

        public:
            PaintArea(QWidget *parent = 0);

            bool openImage(const QString &fileName);
            bool saveImage(const QString &fileName, const char *fileFormat);
            void setImage(const QImage &image);
            void insertShape(const QPainterPath &path);
            void setBrushColor(const QColor &color);
            void setBrushWidth(int width);
            void setBrush(BrushInterface *brushInterface, const QString &brush);

            QImage image() const { return theImage; }
            QColor brushColor() const { return color; }
            int brushWidth() const { return thickness; }
            QSize sizeHint() const;

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

        private:
            void setupPainter(QPainter &painter);

            QImage theImage;
            QColor color;
            int thickness;

            BrushInterface *brushInterface;
            QString brush;
            QPoint lastPos;

            QPainterPath pendingPath;
        };

        #endif