package com.wadedwalker {
	
	//--------------------------------------------------------------------------------------------------------------------------------------\\
	//--------------------------------------------------------------- Imports --------------------------------------------------------------\\
	//--------------------------------------------------------------------------------------------------------------------------------------\\
	import flash.display.Sprite;
	import flash.geom.Rectangle;
	import flash.text.TextField;
	import flash.events.Event;
	import flash.events.MouseEvent;
		
	public class TextScrollBar {
		
		//--------------------------------------------------------------------------------------------------------------------------------------\\
		//----------------------------------------------------------- Variables ----------------------------------------------------------------\\
		//--------------------------------------------------------------------------------------------------------------------------------------\\
		private var thumb:Sprite;
		private var track:Sprite;
		private var textfield:TextField;
		private var dragging:Boolean;
		
		//--------------------------------------------------------------------------------------------------------------------------------------\\
		public function TextScrollBar() {
			//
		}
		
		//--------------------------------------------------------------------------------------------------------------------------------------\\
		public function initialize(tf:TextField, thm:Sprite, trk:Sprite):void {
			thumb = thm;
			track = trk;
			textfield = tf;
			dragging = false;
			
			thumb.buttonMode = track.buttonMode = true;
			thumb.addEventListener(MouseEvent.ROLL_OVER, onRollEvent);
			track.addEventListener(MouseEvent.ROLL_OVER, onRollEvent);
			thumb.addEventListener(MouseEvent.ROLL_OUT, onRollEvent);
			track.addEventListener(MouseEvent.ROLL_OUT, onRollEvent);
			thumb.addEventListener(MouseEvent.MOUSE_DOWN, startDragging);
			track.addEventListener(MouseEvent.MOUSE_DOWN, trackClicked);
		}
		
		//--------------------------------------------------------------------------------------------------------------------------------------\\
		private function startDragging(e:MouseEvent):void {
			dragging = true;
			thumb.startDrag(false, new Rectangle(thumb.x,track.y,0,track.height - thumb.height));
			track.stage.addEventListener(MouseEvent.MOUSE_UP, stopDragging);
			track.stage.addEventListener(Event.ENTER_FRAME, update);
		}
		
		//--------------------------------------------------------------------------------------------------------------------------------------\\
		private function trackClicked(e:MouseEvent):void {
			//If the mouse was clicked in the top most area of the track
			if (e.localY < ((thumb.height >> 1))) {
				thumb.y = track.y;
			}
			
			//If the track was clicked anywhere in the main area of the track
			else if (track.height - e.localY > track.height - (thumb.height >> 1)) {
				thumb.y = track.y + e.localY - thumb.height;
			}
			
			//If the mouse clicked on the bottom most area of the track
			else {
				thumb.y = track.y + e.localY - (thumb.height >> 1);
			}
			
			//Repositioning the text within the textfield based on the current location of the thumb on the track
			textfield.scrollV = int(((thumb.y - track.y) / (track.height - thumb.height)) * (textfield.maxScrollV));
		}
		
		//--------------------------------------------------------------------------------------------------------------------------------------\\
		private function stopDragging(e:Event):void {
			dragging = false;
			thumb.stopDrag();
			track.stage.removeEventListener(MouseEvent.MOUSE_UP, stopDragging);
			track.stage.removeEventListener(Event.ENTER_FRAME, update);
		}
		
		//--------------------------------------------------------------------------------------------------------------------------------------\\
		private function onRollEvent(e:MouseEvent):void {
			//
		}
		
		//--------------------------------------------------------------------------------------------------------------------------------------\\
		private function update(e:Event):void {
			textfield.scrollV = int(((thumb.y - track.y) / (track.height - thumb.height)) * (textfield.maxScrollV));
		}
	}
}