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# composition.h Example File
demos/composition/composition.h

        /****************************************************************************
         **
         ** Copyright (C) 2005-2006 Trolltech ASA. 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
        **
        ** If you are unsure which license is appropriate for your use, please
        ** 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 COMPOSITION_H
        #define COMPOSITION_H

        #include "arthurwidgets.h"

        #include <QPainter>
        #include <QEvent>

        class QPushButton;
        class QRadioButton;

        class CompositionWidget : public QWidget
        {
            Q_OBJECT

        public:
            CompositionWidget(QWidget *parent);

        public slots:
        void nextMode();

        private:
            bool m_cycle_enabled;

            QRadioButton *rbClear;
            QRadioButton *rbSource;
            QRadioButton *rbDest;
            QRadioButton *rbSourceOver;
            QRadioButton *rbDestOver;
            QRadioButton *rbSourceIn;
            QRadioButton *rbDestIn;
            QRadioButton *rbSourceOut;
            QRadioButton *rbDestOut;
            QRadioButton *rbSourceAtop;
            QRadioButton *rbDestAtop;
            QRadioButton *rbXor;
        };

        class CompositionRenderer : public ArthurFrame
        {
            Q_OBJECT

            enum ObjectType { NoObject, Circle, Rectangle, Image };

            Q_PROPERTY(int circleColor READ circleColor WRITE setCircleColor)
            Q_PROPERTY(int circleAlpha READ circleAlpha WRITE setCircleAlpha)
            Q_PROPERTY(bool animation READ animationEnabled WRITE setAnimationEnabled)

        public:
            CompositionRenderer(QWidget *parent);

            void paint(QPainter *);

            void mousePressEvent(QMouseEvent *);
            void mouseMoveEvent(QMouseEvent *);
            void mouseReleaseEvent(QMouseEvent *);

            void setCirclePos(const QPointF &pos) { m_circle_pos = pos; update(); }

            QSize sizeHint() const { return QSize(500, 400); }

            bool animationEnabled() const { return m_animation_enabled; }
            int circleColor() const { return m_circle_hue; }
            int circleAlpha() const { return m_circle_alpha; }

        public slots:
        void setClearMode() { m_composition_mode = QPainter::CompositionMode_Clear; update(); }
            void setSourceMode() { m_composition_mode = QPainter::CompositionMode_Source; update(); }
            void setDestMode() { m_composition_mode = QPainter::CompositionMode_Destination; update(); }
            void setSourceOverMode() { m_composition_mode = QPainter::CompositionMode_SourceOver; update(); }
            void setDestOverMode() { m_composition_mode = QPainter::CompositionMode_DestinationOver; update(); }
            void setSourceInMode() { m_composition_mode = QPainter::CompositionMode_SourceIn; update(); }
            void setDestInMode() { m_composition_mode = QPainter::CompositionMode_DestinationIn; update(); }
            void setSourceOutMode() { m_composition_mode = QPainter::CompositionMode_SourceOut; update(); }
            void setDestOutMode() { m_composition_mode = QPainter::CompositionMode_DestinationOut; update(); }
            void setSourceAtopMode() { m_composition_mode = QPainter::CompositionMode_SourceAtop; update(); }
            void setDestAtopMode() { m_composition_mode = QPainter::CompositionMode_DestinationAtop; update(); }
            void setXorMode() { m_composition_mode = QPainter::CompositionMode_Xor; update(); }

            void setCircleAlpha(int alpha) { m_circle_alpha = alpha; update(); }
            void setCircleColor(int hue) { m_circle_hue = hue; update(); }
            void setAnimationEnabled(bool enabled) { m_animation_enabled = enabled; update(); }

        private:
            void updateCirclePos();
            QPainter::CompositionMode m_composition_mode;

            QImage m_image;
            QImage m_buffer;
            QImage m_base_buffer;

            int m_circle_alpha;
            int m_circle_hue;

            QPointF m_circle_pos;
            QPointF m_offset;

            ObjectType m_current_object;
            bool m_animation_enabled;
        };

        #endif // COMPOSITION_H