Sometimes, people make scrollbars more complicated than they need to be. The
easiest scrollbar to write and use is one that returns a percentage 0-100 based
on its position in the well.
Here is a quick example. I used onEnterFrame for the update because in my
experience, it's smoother than a short interval. YMMV.
private function startScroll():Void
{
BTN_Shuttle.startDrag(false, BTN_Shuttle._x, BTN_Well._y, BTN_Shuttle._x,
BTN_Well._y + BTN_Well._height - BTN_Shuttle._height);
this.onEnterFrame = function() {
this.updateScroll();
};
}
private function stopScroll():Void
{
delete this.onEnterFrame;
stopDrag();
}
public function updateScroll():Void
{
var perc:Number = (BTN_Shuttle._y - BTN_Well._y) / (BTN_Well._height -
BTN_Shuttle._height);
dispatchEvent({type:"change", data:perc});
}
/////
How it works:
It determines the shuttle (slider) position in relation to its total range of
motion along its path (the well). This is achieved with the following simple
equation:
current position / maximum position
This returns a percentage between 0 and 1.
So, you pass that percentage to your clip and adjust its _y accordingly.
private function onScroll(evt:Object):Void
{
var newY:Number = -MC_Holder._height * evt.data;
MC_Holder._y = newY;
}
Easy peasy.
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