src/playlist/PlaylistGraphicsItem.h

   1 /***************************************************************************
   2  * copyright            : (C) 2007 Ian Monroe <ian@monroe.nu>              *
   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 version 2        *
   6  *   as published by the Free Software Foundation.                         *
   7  ***************************************************************************/
   8
   9 #ifndef AMAROK_PLAYLISTGRAPHICSITEM_H
  10 #define AMAROK_PLAYLISTGRAPHICSITEM_H
  11
  12
  13 #include "meta.h"
  14 #include <QGraphicsItem>
  15 #include <QSvgRenderer>
  16
  17 class QFontMetricsF;
  18
  19 namespace Playlist
  20 {
  21     /**
  22      * A lazy-loading QGraphicsItem to display one track in the playlist.
  23      * If a user drags 20000 tracks into the playlist, 20000 GraphicsItem's
  24      * will be created. However only the tracks that are visible will query
  25      * the model for their information, the rest will take up very little memory
  26      * and really aren't associated with a particular track yet.
  27      * On a paint operation the GraphicsItem will be "active" by creating an ActiveItems.
  28      * Do not add any data members to GraphicsItem, you should be able to add them to
  29      * ActiveItems instead.
  30      */
  31     class GraphicsItem : public QGraphicsItem
  32     {
  33         class ActiveItems;
  34
  35         public:
  36             GraphicsItem();
  37             ~GraphicsItem();
  38             ///Be sure to read ::paint rules in-method
  39             void paint( QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget );
  40             QRectF boundingRect() const;
  41             void setupItem();
  42             void refresh();
  43             void play();
  44
  45             void setRow( int row );
  46
  47         protected:
  48             void dragEnterEvent( QGraphicsSceneDragDropEvent *event );
  49             void dropEvent( QGraphicsSceneDragDropEvent * event );
  50             void mouseDoubleClickEvent( QGraphicsSceneMouseEvent* event );
  51             void mousePressEvent( QGraphicsSceneMouseEvent* event );
  52             void mouseMoveEvent( QGraphicsSceneMouseEvent* event );
  53             void mouseReleaseEvent ( QGraphicsSceneMouseEvent * event );
  54
  55         private:
  56             void init( Meta::TrackPtr track );
  57             void resize( Meta::TrackPtr track, int totalWidth );
  58             QString findArtistForCurrentAlbum() const;
  59
  60             ActiveItems* m_items;
  61             qreal m_height;
  62             int m_groupMode;
  63             int m_currentRow;
  64             bool m_groupModeChanged;
  65
  66             static const qreal ALBUM_WIDTH;
  67             static const qreal MARGIN;
  68             static QFontMetricsF* s_fm;
  69             static QSvgRenderer * s_svgRenderer;
  70
  71
  72     };
  73
  74 }
  75 #endif
  76