Get the percentage of the scroll bar knob versus the scrollable area on the scrollbar.. Then treat the height of the content to be scrolled as 100% and convert some percentages around.. but it turns out to be a code mess D:
// Offsets defined by refresh
var $offsetA:Number = 0;//$offsetA: is a scrollValue
var $offsetBa:Number = 0;
var $offsetBb:Number = 0;//$offsetBb: is a scrollValueCounter point the percentage revlant to the message boxes
var $offsetCa:Number = 0;
var $offsetCb:Number = 0;
var $offsetD:Number = 0;
var boundsRectangle:Rectangle;
var Enabled:Boolean = false;
this.addEventListener(MouseEvent.MOUSE_DOWN, Scroll_START)
this.addEventListener(Event.ENTER_FRAME,setScroll)
stage.addEventListener(MouseEvent.MOUSE_UP, Scroll_END)
function Scroll_START($pass:Event) {
if (Enabled) {
Top_Layer.slider.startDrag(false, boundsRectangle)
}
}
function Scroll_END($pass:Event) {
if (Enabled) {
Top_Layer.slider.stopDrag()
}
}
function Refresh() {
this.Top_Layer.slider.height = 353 * (this.Top_Layer.height / MovieClip(this.parent).Messages.height)
boundsRectangle = new Rectangle(-0.5,12.8,0,(353 - (this.Top_Layer.slider.height +26)))
$offsetBa = MovieClip(this.parent).Messages.y;
$offsetBb = MovieClip(this.parent).Messages.height;
$offsetCa = this.Top_Layer.slider.y;
$offsetCb = this.Top_Layer.slider.height;
trace(this.Top_Layer.slider.height)
trace(this.Top_Layer.height)
trace(MovieClip(this.parent).Messages.height)
trace(MovieClip(this.parent).Messages.y)
Enabled = true;
}
function setScroll(event:Event) {
if (boundsRectangle) {
$offsetA = (this.Top_Layer.slider.y-$offsetCa) / boundsRectangle.height;
MovieClip(this.parent).Messages.y =(($offsetBb * $offsetA)*-1)
trace($offsetBb)
trace($offsetA)
trace($offsetBb * $offsetA)
trace(($offsetBb * $offsetA)*-1+$offsetBb)
}
}
