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# gradients.h Example File
demos/gradients/gradients.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:
        ** http://www.trolltech.com/products/qt/licensing.html or contact the
        ** sales department at sales@trolltech.com.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #ifndef GRADIENTS_H
        #define GRADIENTS_H

        #include "arthurwidgets.h"

        #include <QtGui>

        class HoverPoints;

        class ShadeWidget : public QWidget
        {
            Q_OBJECT
        public:
            enum ShadeType {
                RedShade,
                GreenShade,
                BlueShade,
                ARGBShade
            };

            ShadeWidget(ShadeType type, QWidget *parent);

            void setGradientStops(const QGradientStops &stops);

            void paintEvent(QPaintEvent *e);

            QSize sizeHint() const { return QSize(150, 40); }
            QPolygonF points() const;

            HoverPoints *hoverPoints() const { return m_hoverPoints; }

            uint colorAt(int x);

        signals:
            void colorsChanged();

        private:
            void generateShade();

            ShadeType m_shade_type;
            QImage m_shade;
            HoverPoints *m_hoverPoints;
            QLinearGradient m_alpha_gradient;
        };

        class GradientEditor : public QWidget
        {
            Q_OBJECT
        public:
            GradientEditor(QWidget *parent);

            void setGradientStops(const QGradientStops &stops);

        public slots:
            void pointsUpdated();

        signals:
            void gradientStopsChanged(const QGradientStops &stops);

        private:
            ShadeWidget *m_red_shade;
            ShadeWidget *m_green_shade;
            ShadeWidget *m_blue_shade;
            ShadeWidget *m_alpha_shade;
        };

        class GradientRenderer : public ArthurFrame
        {
            Q_OBJECT
        public:
            GradientRenderer(QWidget *parent);
            void paint(QPainter *p);

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

            HoverPoints *hoverPoints() const { return m_hoverPoints; }
            void mousePressEvent(QMouseEvent *e);

        public slots:
            void setGradientStops(const QGradientStops &stops);

            void setPadSpread() { m_spread = QGradient::PadSpread; update(); }
            void setRepeatSpread() { m_spread = QGradient::RepeatSpread; update(); }
            void setReflectSpread() { m_spread = QGradient::ReflectSpread; update(); }

            void setLinearGradient() { m_gradientType = Qt::LinearGradientPattern; update(); }
            void setRadialGradient() { m_gradientType = Qt::RadialGradientPattern; update(); }
            void setConicalGradient() { m_gradientType = Qt::ConicalGradientPattern; update(); }

        private:
            QGradientStops m_stops;
            HoverPoints *m_hoverPoints;

            QGradient::Spread m_spread;
            Qt::BrushStyle m_gradientType;
        };

        class GradientWidget : public QWidget
        {
            Q_OBJECT
        public:
            GradientWidget(QWidget *parent);

        public slots:
            void setDefault1() { setDefault(1); }
            void setDefault2() { setDefault(2); }
            void setDefault3() { setDefault(3); }
            void setDefault4() { setDefault(4); }

        private:
            void setDefault(int i);

            GradientRenderer *m_renderer;
            GradientEditor *m_editor;

            QRadioButton *m_linearButton;
            QRadioButton *m_radialButton;
            QRadioButton *m_conicalButton;
            QRadioButton *m_padSpreadButton;
            QRadioButton *m_reflectSpreadButton;
            QRadioButton *m_repeatSpreadButton;

        };

        #endif // GRADIENTS_H