kineticview.cpp

   1 #include "kineticview.h"
   2
   3 #include <QObject>
   4 #include <QDebug>
   5
   6 KineticView::KineticView( QGraphicsWidget *parent)
   7     : QGraphicsWidget( parent )
   8 {
   9     setFiltersChildEvents ( true );
  10     setFlag(QGraphicsItem::ItemIsMovable, true);
  11     setFlag(QGraphicsItem::ItemIsSelectable, true);
  12     setAcceptedMouseButtons( Qt::LeftButton );
  13     setAcceptTouchEvents( true );
  14
  15     scroll = new QPropertyAnimation(this, "y");
  16
  17     resize(300, 700);
  18 }
  19
  20 KineticView::~KineticView()
  21 {
  22     //for(int i = 0; i < itemList.size(); i++)
  23     //    delete itemList.at(i);
  24     delete scroll;
  25 }
  26
  27 void KineticView::scrollingAnimation(unsigned int duration, qreal startValue, qreal endValue)
  28 {
  29     scroll->setEasingCurve( QEasingCurve::OutQuart );
  30     scroll->setDuration( duration*3 );
  31     scroll->setStartValue(startValue);
  32     scroll->setEndValue(endValue);
  33     scroll->start();
  34 }
  35
  36 void KineticView::insertItem( QGraphicsWidget *item)
  37 {
  38     item->setParentItem( this );
  39     item->setParentLayoutItem( this );
  40
  41     if ( !itemList.empty() ) {
  42         QRectF tmpGeometry = itemList.last()->geometry();
  43         item->setGeometry( QRectF(tmpGeometry.x(), tmpGeometry.y() + tmpGeometry.height(), item->geometry().width(), item->geometry().height()));
  44     }
  45     itemList.append( item );
  46
  47     update();
  48 }
  49
  50 QGraphicsItem *KineticView::itemAt( int i )
  51 {
  52     return itemList.at(i);
  53 }
  54
  55 bool KineticView::event ( QEvent * event )
  56 {
  57     switch( event->type() ) {
  58         case QEvent::GraphicsSceneMousePress:
  59             KineticScrolling::mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event));
  60             QGraphicsWidget::mousePressEvent(static_cast<QGraphicsSceneMouseEvent*>(event));
  61             break;
  62         case QEvent::GraphicsSceneMouseMove:
  63             KineticScrolling::mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event));
  64             QGraphicsWidget::mouseMoveEvent(static_cast<QGraphicsSceneMouseEvent*>(event));
  65             break;
  66         case QEvent::GraphicsSceneMouseRelease:
  67             KineticScrolling::mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event));
  68
  69             if( movement() > 10) {
  70                 QGraphicsWidget::mouseReleaseEvent(static_cast<QGraphicsSceneMouseEvent*>(event));
  71                 scrollingAnimation(duration(), geometry().y(), geometry().y() - movement());
  72             }
  73             break;
  74         default:
  75             break;
  76     }
  77
  78     return true;
  79 }