Oh, its fine - not choppy at all. I've even been toying with the idea of
doing something more acceleration based instead, but probably won't bother.
I scroll to a position where some text is newly selected. I just needed to
be careful that I only made the selection after the scrolling finished.
Otherwise, I think it jumps straight there when you make the selection...
Also, if the number of lines to be scrolled is below a certain minimum, I
base the duration on the number of lines (so it doesnt scroll too slow).
Above that minimum, I use a fixed duration.
private function verticalScrollToPosition(newPosition:int,
nextFunc:Function, durationInMillis:Number = SCROLL_DURATION_IN_MILLIS):void
{
var scrollEffect:AnimateProperty = new AnimateProperty(this)
scrollEffect.addEventListener(EffectEvent.EFFECT_END,
function(evt:EffectEvent):void {
if (nextFunc != null) {
nextFunc();
}
});
scrollEffect.property = "verticalScrollPosition";
scrollEffect.toValue = newPosition;
// maybe possible to use scrollEffect.fromValue instead of
this.verticalScrollPosition?
var linesToScroll:int = Math.abs(newPosition -
this.verticalScrollPosition);
// don't go too slow
scrollEffect.duration = Math.min(durationInMillis, (1000 *
linesToScroll) /
MIN_SCROLL_SPEED);
scrollEffect.play();
}
I'd never heard of easing functions before. I'll check them out...
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