Scrolling with gestures

[woodtluk]

I'v a custom Widget class and try to scroll with a gesture:

MyWidget::MyWidget(QWidget *parent) :
QWidget(parent) {
 
  grabGesture(Qt::SwipeGesture);
}
 
bool MyWidget::event ( QEvent * event ) {
  if (event->type() == QEvent::Gesture)
           return gestureEvent(static_cast<QGestureEvent*>(event));
 
  return QWidget::event(event);
}
 
  bool MyWidget::gestureEvent ( QGestureEvent * event ) {
    if (QGesture *swipe = event->gesture(Qt::SwipeGesture)) {
      QSwipeGesture * swipeGesture = static_cast<QSwipeGesture *>(swipe);
 
      int scrollFactor = 10;
      if(swipeGesture->verticalDirection() == QSwipeGesture::Down)
        scrollFactor = -scrollFactor;
 
      if(swipeGesture->state() == Qt::GestureUpdated)
        scroll(0, scrollFactor);
 
 
    }
    return true;
  }

MyWidget::MyWidget(QWidget *parent) :
QWidget(parent) {

  grabGesture(Qt::SwipeGesture);
}

bool MyWidget::event ( QEvent * event ) {
  if (event->type() == QEvent::Gesture)
           return gestureEvent(static_cast<QGestureEvent*>(event));

  return QWidget::event(event);
}

  bool MyWidget::gestureEvent ( QGestureEvent * event ) {
    if (QGesture *swipe = event->gesture(Qt::SwipeGesture)) {
      QSwipeGesture * swipeGesture = static_cast<QSwipeGesture *>(swipe);

      int scrollFactor = 10;
      if(swipeGesture->verticalDirection() == QSwipeGesture::Down)
        scrollFactor = -scrollFactor;

      if(swipeGesture->state() == Qt::GestureUpdated)
        scroll(0, scrollFactor);


    }
    return true;
  }

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But I never get a gesture event.
Tried on Windows and on Symbian.

What's gonig on?

Thx!!!

[wysota]

Does your device support multi-touch? In Qt 4.6 gestures are only available for multi-touch devices.

[woodtluk]

It's a Nokia N8 and it supports multi-touch...

Thanks...

[ashvindh]

Hi,
Same problem i am trying to listen for gesture events on QGraphicsItem custom class
class TextItem : public QGraphicsTextItem
{
public:
TextItem(QGraphicsTextItem* parent = 0 ) : QGraphicsTextItem(parent)
{
grabGesture(Qt::SwipeGesture);
}

bool sceneEvent (QEvent* event);
bool gestureEvent(QGestureEvent* event);
void swipeTriggered(QSwipeGesture* gesture);
};

Only sceneEvent is generated but no gestrue event caught, using 4.7 on win xp.

What must be the problem??

Thanks
Asvindh R

[wysota]

Do you have a multitouch screen with proper drivers installed in your system? As far as I remember Windows XP doesn't have built-in support for reporting multi-touch events.