src/contextview/graphicsitemfader.h

   1 /***************************************************************************
   2  *   Copyright (c) 2007  Nikolaj Hald Nielsen <nhnFreespirit@gmail.com>    *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA  02111-1307, USA.          *
  18  ***************************************************************************/
  19
  20 #ifndef GRAPHICSITEMFADER_H
  21 #define GRAPHICSITEMFADER_H
  22
  23 #include <QObject>
  24 #include <QGraphicsPixmapItem>
  25 #include <QGraphicsRectItem>
  26 #include <QTimeLine>
  27
  28 namespace Context
  29 {
  30
  31
  32     /**
  33     A simple "widget" for the context view that provides a fading image
  34     Will be ported to use QGraphicsSvgItem once that successfully renders
  35     the Amarok logo file
  36
  37         @author Nikolaj Hald Nielsen <nhnFreespirit@gmail.com>
  38     */
  39     class GraphicsItemFader : public QObject, public QGraphicsItem
  40     {
  41
  42     Q_OBJECT
  43     public:
  44         explicit GraphicsItemFader( QGraphicsItem * item, QGraphicsItem * parent = 0 );
  45         ~GraphicsItemFader();
  46
  47         virtual QRectF boundingRect () const;
  48         void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget );
  49
  50         void setFadeColor( const QColor &color );
  51         void setStartAlpha( int alpha );
  52         void setTargetAlpha( int alpha );
  53         void setDuration( int ms );
  54         void setFPS( int fps );
  55         void startFading();
  56         QGraphicsItem* contentItem() { return m_contentItem; }
  57
  58     signals:
  59         void animationComplete();
  60
  61     public slots:
  62         void fadeSlot( int step );
  63         void fadeFinished();
  64
  65     private:
  66         QTimeLine * m_timeLine;
  67         QGraphicsItem * m_contentItem;
  68         QGraphicsRectItem * m_shadeRectItem;
  69         QGraphicsItem * m_itemPreviousParent;
  70
  71         QColor m_fadeColor;
  72         int m_startAlpha;
  73         int m_targetAlpha;
  74         float m_alphaStep;
  75         int m_fps;
  76         int m_duration;
  77         int m_animationSteps;
  78         int m_width;
  79         int m_height;
  80
  81
  82     };
  83
  84 }
  85
  86
  87 #endif