@Override
public void onSwipeVertical(SwipeEvent e) {
long current = getTranslateY(getWidget().getElement());
if ((current >= 0) // exceed top boundary
|| (-current + this.getElement().getClientHeight()
>= this.getElement().getScrollHeight())) { // exceed bottom
// boundary
return;
}
double speed = e.getSpeed() * 2000;
double dicstanceFactor = 0.5;
double timeFactor = 2;
long distance =
(long) (speed / Math.abs(speed)) * Math.round(speed * speed * dicstanceFactor / 1000);
long time = Math.round(speed * speed * timeFactor / 2000);
current += distance;
if (current > 0) { // exceed top boundary
double timeAdj = 1 - (double) current / distance;
time = (long) (time * timeAdj * timeAdj);
current = 0;
} else if (-current + this.getElement().getClientHeight()
> this.getElement().getScrollHeight()) { // exceed bottom boundary
long bottom = this.getElement().getClientHeight() - this.getElement().getScrollHeight();
double timeAdj = 1 - (double) (current - bottom) / distance;
time = (long) (time * timeAdj * timeAdj);
current = bottom;
}
setTransitionDuration(getWidget().getElement(), time);
setTranslateY(getWidget().getElement(), current);
}
@Override
public void onSwipeHorizontal(SwipeEvent e) {
if (e.getSpeed() < 0) { // swipe to next
next();
} else { // swipe to previous
previous();
}
}