kineticview.h

   1 /***********************************************************************/
   2 /* kineticview.h                                                       */
   3 /*                                                                     */
   4 /* Copyright(C) 2009 Igor Trindade Oliveira <igor.oliveira@indt.org.br>*/
   5 /* Copyright(C) 2009 Adenilson Cavalcanti <adenilson.silva@idnt.org.br>*/
   6 /*                                                                     */
   7 /* This library is free software; you can redistribute it and/or       */
   8 /* modify it under the terms of the GNU Lesser General Public          */
   9 /* License as published by the Free Software Foundation; either        */
  10 /* version 2.1 of the License, or (at your option) any later version.  */
  11 /*                                                                     */
  12 /* This library is distributed in the hope that it will be useful,     */
  13 /* but WITHOUT ANY WARRANTY; without even the implied warranty of      */
  14 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU   */
  15 /* Lesser General Public License for more details.                     */
  16 /*                                                                     */
  17 /* You should have received a copy of the GNU Lesser General Public    */
  18 /* License along with this library; if not, write to the Free Software */
  19 /* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA       */
  20 /* 02110-1301  USA                                                     */
  21 /***********************************************************************/
  22 #ifndef KINETICLAYOUT_H
  23 #define KINETICLAYOUT_H
  24
  25 #include <QGraphicsWidget>
  26 #include <QGraphicsSceneMouseEvent>
  27
  28 class QGraphicsGridLayout;
  29 class ScrollBar;
  30 class KineticScrolling;
  31
  32 class KineticView : public QGraphicsWidget
  33 {
  34     Q_OBJECT
  35
  36     public:
  37         KineticView( QGraphicsWidget *parent = 0 );
  38         ~KineticView();
  39
  40         void setWidget( QGraphicsWidget *item );
  41
  42     private:
  43         QGraphicsWidget * mWindow;
  44         QGraphicsWidget *mViewPort;
  45         QGraphicsGridLayout *layout;
  46         ScrollBar *verticalScrollbar;
  47         qreal mScrollVelocity;
  48         enum { NONE, UP, DOWN };
  49         int timerID, overshut, cposition, direction, minimalPos, maximumPos;
  50         char bounceFlag;
  51         void doneOvershut(void);
  52         KineticScrolling *scroller;
  53
  54     protected:
  55         void resizeEvent( QGraphicsSceneResizeEvent *event );
  56
  57         void mousePressEvent( QGraphicsSceneMouseEvent *event );
  58         void mouseMoveEvent( QGraphicsSceneMouseEvent *event );
  59         void mouseReleaseEvent( QGraphicsSceneMouseEvent *event );
  60         void wheelEvent(QGraphicsSceneWheelEvent *event);
  61         void timerEvent( QTimerEvent *event );
  62         void bounceTimer();
  63
  64     public Q_SLOTS:
  65         void setKineticScrollValue( int value );
  66         void setVerticalScrollValue( int value );
  67
  68     private:
  69         void startTimer(int interval);
  70         void adjustScrollBar();
  71 };
  72
  73 #endif