kineticscroll.cpp

   1 /////////////////////////////////////////////////////////////////////////
   2 // kineticscroll.cpp                                                   //
   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 #include "kineticscroll.h"
  23
  24 #include <QDebug>
  25
  26 void KineticScrollingPrivate::count()
  27 {
  28     t = QTime::currentTime();
  29     t.start();
  30 }
  31
  32 unsigned int KineticScrollingPrivate::elapsed()
  33 {
  34     return t.restart();
  35 }
  36
  37 KineticScrolling::KineticScrolling(): d( 0 )
  38 {
  39     d = new KineticScrollingPrivate;
  40 }
  41
  42 KineticScrolling::~KineticScrolling()
  43 {
  44     delete d;
  45 }
  46
  47 int KineticScrolling::movement()
  48 {
  49     return d->movement;
  50 }
  51
  52 int KineticScrolling::kin_movement()
  53 {
  54     return d->kin_movement;
  55 }
  56
  57 qreal KineticScrolling::duration()
  58 {
  59     return d->timeDelta;
  60 }
  61
  62 void KineticScrolling::mousePressEvent( QGraphicsSceneMouseEvent *event )
  63 {
  64     d->count();
  65     d->scrollVelocity = 0;
  66     d->movement = 0;
  67     d->kin_movement = 0;
  68 }
  69
  70 void KineticScrolling::mouseMoveEvent( QGraphicsSceneMouseEvent *event )
  71 {
  72     int temp = event->lastPos().y() - event->pos().y();
  73     if ( temp ) {
  74         d->movement = temp;
  75         d->kin_movement += temp;
  76     }
  77 }
  78
  79 void KineticScrolling::mouseReleaseEvent( QGraphicsSceneMouseEvent *event )
  80 {
  81     d->timeDelta = d->elapsed();
  82     int temp = event->lastPos().y() - event->pos().y();
  83     if ( temp )
  84         d->kin_movement += temp;
  85
  86     if ( d->timeDelta > 200) {
  87         if ( d->kin_movement > 0 )
  88             d->kin_movement = 3;
  89         else
  90             d->kin_movement = -3;
  91     }
  92
  93 }