|  | Home · All Namespaces · All Classes · Main Classes · Grouped Classes · Modules · Functions |

# gradients.h Example File
demos/gradients/gradients.h

     /****************************************************************************
     **
     ** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License versions 2.0 or 3.0 as published by the Free Software
     ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
     ** included in the packaging of this file.  Alternatively you may (at
     ** your option) use any later version of the GNU General Public
     ** License if such license has been publicly approved by Trolltech ASA
     ** (or its successors, if any) and the KDE Free Qt Foundation. In
     ** addition, as a special exception, Trolltech gives you certain
     ** additional rights. These rights are described in the Trolltech GPL
     ** Exception version 1.2, which can be found at
     ** http://www.trolltech.com/products/qt/gplexception/ and in the file
     ** GPL_EXCEPTION.txt in this package.
     **
     ** Please review the following information to ensure GNU General
     ** Public Licensing requirements will be met:
     ** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
     ** you are unsure which license is appropriate for your use, please
     ** review the following information:
     ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
     ** or contact the sales department at sales@trolltech.com.
     **
     ** In addition, as a special exception, Trolltech, as the sole
     ** copyright holder for Qt Designer, grants users of the Qt/Eclipse
     ** Integration plug-in the right for the Qt/Eclipse Integration to
     ** link to functionality provided by Qt Designer and its related
     ** libraries.
     **
     ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
     ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
     ** granted herein.
     **
     ** 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