ThumbnailView/SelectionInteraction.h

   1 /* Copyright (C) 2003-2009 Jesper K. Pedersen <blackie@kde.org>
   2
   3    This program is free software; you can redistribute it and/or
   4    modify it under the terms of the GNU General Public
   5    License as published by the Free Software Foundation; either
   6    version 2 of the License, or (at your option) any later version.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11    General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program; see the file COPYING.  If not, write to
  15    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  16    Boston, MA 02110-1301, USA.
  17 */
  18 #ifndef SELECTIONINTERACTION_H
  19 #define SELECTIONINTERACTION_H
  20
  21 #include "ThumbnailComponent.h"
  22 #include "enums.h"
  23 #include "MouseInteraction.h"
  24 #include <qobject.h>
  25
  26 namespace DB { class ResultId; }
  27
  28 class QMouseEvent;
  29 namespace ThumbnailView
  30 {
  31 class ThumbnailFactory;
  32 class Cell;
  33
  34 class SelectionInteraction : public QObject, public MouseInteraction, private ThumbnailComponent {
  35     Q_OBJECT
  36
  37 public:
  38     SelectionInteraction( ThumbnailFactory* factory );
  39     virtual void mousePressEvent( QMouseEvent* );
  40     virtual void mouseMoveEvent( QMouseEvent* );
  41     virtual void mouseReleaseEvent( QMouseEvent* );
  42     bool isDragging() const;
  43
  44 protected:
  45     bool isMouseOverIcon( const QPoint& viewportPos ) const;
  46     void startDrag();
  47     bool atLeftSide( const QPoint& contentCoordinates );
  48     bool atRightSide( const QPoint& contentCoordinates );
  49     Cell prevCell( const Cell& cell );
  50     Cell nextCell( const Cell& cell );
  51     QRect iconRect( const QPoint& pos, CoordinateSystem ) const;
  52     bool deselectSelection( const QMouseEvent* ) const;
  53
  54 protected slots:
  55     void handleDragSelection();
  56     void calculateSelection( Cell* pos1, Cell* pos2 );
  57
  58 private:
  59     typedef QSet<DB::ResultId> IdSet;
  60     /**
  61      * This variable contains the position the mouse was pressed down.
  62      * The point is in contents coordinates.
  63      */
  64     QPoint _mousePressPos;
  65
  66     /**
  67      * Did the mouse interaction start with the mouse on top of an icon.
  68      */
  69     bool _isMouseDragOperation;
  70
  71     IdSet _originalSelectionBeforeDragStart;
  72     QTimer* _dragTimer;
  73     bool _dragInProgress;
  74     bool _dragSelectionInProgress;
  75     ThumbnailFactory* _JUMP;
  76 };
  77
  78 }
  79
  80 #endif /* SELECTIONINTERACTION_H */
  81