import mx.transitions.Tween;
import mx.transitions.easing.*;
 
track_mc._visible = false;
drag_mc._visible = false;
 
mouseListener = new Object();
 
function scrollInfo() {
	// If scrolling is not needed, hide scrolling assets
	track_mc._visible = false;
	drag_mc._visible = false;
	// Find height of the target_mc
	var clipheight:Number = target_mc._height;
	// Find y position of target_mc
	var starty:Number = 0;
	target_mc._y = 0;
	// Find height of mask over target_mc
	var maskheight:Number = mask_mc._height;
	// Limit scrolling
	var maxscroll:Number = maskheight-clipheight+starty;
	// Start dragging position
	var startposition:Number = drag_mc._y=track_mc._y;
	// Find y position of scrollbar face
	var startdragT:Number = drag_mc._y;
	// Limit var for scrollbar face
	var startdragB:Number = track_mc._height-drag_mc._height+track_mc._y;
	// Calculation for scrolling clip
	var diff:Number = (clipheight-maskheight)/(track_mc._height-drag_mc._height);
	// Var for activating the MouseWheel scrolling
	var mScroll:Boolean = false;
	// Disable all this if scrolling isn't necessary
	if (target_mc._height<mask_mc._height) {
		track_mc._visible = false;
		drag_mc._visible = false;
		mScroll = false;
		mouseWheelScroll();
	} else {
		track_mc._visible = true;
		drag_mc._visible = true;
		mScroll = true;
		mouseWheelScroll();
	}
	// drag_mc on press
	drag_mc.onRollOver = function() {
		this.gotoAndPlay("start");
	};
	drag_mc.onRollOut = function() {
		this.gotoAndPlay("end");
	};
	drag_mc.onPress = function() {
		// Start dragging, limit the dragging to parameters
		startDrag(this, false, this._x, track_mc._y, this._x, (track_mc._height+track_mc._y)-this._height);
		// Update scrolling clip in conjunction with the y position of the drag_mc
		this.onMouseMove = function() {
			difference = Math.abs(startposition-this._y);
			target_mc._y = -Math.round(difference*diff+starty);
		};
	};
	// On release, kill function
	drag_mc.onRelease = function () {
		stopDrag();
		delete this.onMouseMove;
	};
	drag_mc.onReleaseOutside = function () {
		stopDrag();
		this.gotoAndPlay("end");
		delete this.onMouseMove;
	};
	// Mouse Wheel Scrolling
	function mouseWheelScroll() {
		mouseListener.onMouseWheel = function(delta) {
			// Only do it if the mouse is hovering over the text area
			if (_xmouse > mask_mc._x && _xmouse < mask_mc._x+mask_mc._width && _ymouse > mask_mc._y && _ymouse < mask_mc._y+mask_mc._height) {
				if (delta<0 && mScroll == true) {
					if (target_mc._y>maxscroll+20) {
						target_mc._y += delta*10;
					} else {
						target_mc._y = maxscroll;
					}
				}
				if (delta>0 && mScroll == true) {
					if (target_mc._y<starty-20) {
						target_mc._y += delta*10;
					} else {
						target_mc._y = starty;
					}
				}
				drag_mc.gotoAndPlay("end");
			}
			// Move the scroll button to correspond with the position of the text (this was the hard part)
			difference = Math.abs(startposition-target_mc._y);
			var mT:Tween = new Tween(drag_mc, "_y", Regular.easeOut, drag_mc._y, difference/diff+starty, 0.2, true);
		};
		Mouse.addListener(mouseListener);
	}
}