FULLSCROLLBAR: AS3 SCROLLBAR CLASS

package
{
	
	
/*
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    ______      _________                 ______              
   / ____/_  __/ / / ___/______________  / / / /_  ____ ______
  / /_  / / / / / /\__ \/ ___/ ___/ __ \/ / / __ \/ __ `/ ___/
 / __/ / /_/ / / /___/ / /__/ /  / /_/ / / / /_/ / /_/ / /    
/_/    \__,_/_/_//____/\___/_/   \____/_/_/_.___/\__,_/_/     

*/


	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.geom.Rectangle;
	import flash.geom.Matrix;
	import flash.display.GradientType;
	import flash.display.SpreadMethod;
	
	
	public class FullScrollbar extends Sprite
	{
		
		
		
		public var marginTop:int = 20;
		public var marginBottom:int = 20;
		public var targetHeight:int;
		public var target:Sprite;
		
		private var SCRB_BACKGROUND:Sprite;
		private var SCRB_HANDLER:Sprite;
		private var SCRB_status:Boolean = false;
		private var SCRB_scrollY:int = 0;
		private var SCRB_handlerY:int = 0;
		private var SCRB_maxHeight:int;
		
		
		
		
		public function KillerScrollbar() 
		{ 
			trace("FullScrollbar: Hello!");		
		};
		public function resize() 
		{ 
			SCRB_handlerY = SCRB_HANDLER.y;
			SCRB_scrollY = 0;
			render(0);	
		};
		
		
/*
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    _       _ __ 
   (_)___  (_) /_
  / / __ \/ / __/
 / / / / / / /_  
/_/_/ /_/_/\__/  
                 
*/
		
		public function init():void 
		{

			var matr:Matrix = new Matrix();
			matr.createGradientBox(20, 1, 0, 0, 0);
			
			SCRB_BACKGROUND = new Sprite();
			SCRB_BACKGROUND.graphics.beginGradientFill(GradientType.LINEAR, [0x999999, 0xBBBBBB], [1, 1], [0x00, 0xFF], matr, SpreadMethod.PAD); 
			SCRB_BACKGROUND.graphics.drawRoundRect(0, 0, 20, 100, 20, 20);
			SCRB_BACKGROUND.graphics.endFill();
			var grid1:Rectangle = new Rectangle(1, 20, 18, 60);
			SCRB_BACKGROUND.scale9Grid = grid1;
			addChild(SCRB_BACKGROUND);
			
			SCRB_HANDLER = new Sprite();
			SCRB_HANDLER.graphics.beginGradientFill(GradientType.LINEAR, [0x444444, 0x000000], [1, 1], [0x00, 0xFF], matr, SpreadMethod.PAD); 
			SCRB_HANDLER.graphics.drawRoundRect(0, 0, 20, 50, 20, 20);
			SCRB_HANDLER.graphics.endFill();
			var grid2:Rectangle = new Rectangle(1, 20, 18, 10);
			SCRB_HANDLER.scale9Grid = grid2;
			addChild(SCRB_HANDLER);
			
			SCRB_HANDLER.addEventListener( MouseEvent.MOUSE_DOWN, EVT_HANDLER_mouseDown );
			SCRB_HANDLER.addEventListener( MouseEvent.MOUSE_UP, EVT_HANDLER_mouseUp );
			this.stage.addEventListener( MouseEvent.MOUSE_WHEEL, EVT_STAGE_mouseWheel );
			this.stage.addEventListener( Event.MOUSE_LEAVE, EVT_STAGE_mouseLeave );
			this.stage.addEventListener( Event.RESIZE, EVT_STAGE_resize );
			trace("FullScrollbar: Ready");
			
			resize();
				
		};
	

/*
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
         __                                           __      
   _____/ /_____ _____ ____     ___ _   _____  ____  / /______
  / ___/ __/ __ `/ __ `/ _ \   / _ \ | / / _ \/ __ \/ __/ ___/
 (__  ) /_/ /_/ / /_/ /  __/  /  __/ |/ /  __/ / / / /_(__  ) 
/____/\__/\__,_/\__, /\___/   \___/|___/\___/_/ /_/\__/____/  
               /____/                                         
*/

		public function EVT_STAGE_mouseWheel( e:MouseEvent ):void
		{
			SCRB_handlerY = SCRB_HANDLER.y;
			SCRB_scrollY = 0;
			var eDelta = int(e.delta);
			if( eDelta != -1 ) if( eDelta != 0 ) if( eDelta != 1 ) render( eDelta * (-6) );
		};
		public function EVT_STAGE_mouseMove( e:MouseEvent ):void 
		{
			render(e.stageY);
		};
		public function EVT_STAGE_releaseOutside( e:MouseEvent ):void 
		{
			SCRB_status = false;
			e.target.stage.removeEventListener( MouseEvent.MOUSE_UP, EVT_STAGE_releaseOutside );
			e.target.stage.removeEventListener( MouseEvent.MOUSE_MOVE, EVT_STAGE_mouseMove );
		};
		public function EVT_STAGE_mouseLeave( e:Event ):void
		{
			if( SCRB_status )
			{
				SCRB_status = false;
				e.target.stage.removeEventListener( MouseEvent.MOUSE_UP, EVT_STAGE_releaseOutside );
				e.target.stage.removeEventListener( MouseEvent.MOUSE_MOVE, EVT_STAGE_mouseMove );
			}
		};
		public function EVT_STAGE_resize( e:Event ):void
		{
			resize();
		};
		
		
/*
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    __                    ____                                  __      
   / /_  ____ _____  ____/ / /__  _____   ___ _   _____  ____  / /______
  / __ \/ __ `/ __ \/ __  / / _ \/ ___/  / _ \ | / / _ \/ __ \/ __/ ___/
 / / / / /_/ / / / / /_/ / /  __/ /     /  __/ |/ /  __/ / / / /_(__  ) 
/_/ /_/\__,_/_/ /_/\__,_/_/\___/_/      \___/|___/\___/_/ /_/\__/____/  

*/
		
		public function EVT_HANDLER_mouseDown( e:MouseEvent ):void {
			SCRB_handlerY = SCRB_HANDLER.y;
			SCRB_scrollY = e.stageY;
			SCRB_HANDLER.addEventListener( MouseEvent.ROLL_OUT, EVT_HANDLER_rollOut, false, 0, true );
			e.target.stage.addEventListener( MouseEvent.MOUSE_MOVE, EVT_STAGE_mouseMove, false, 0, true );
			e.target.stage.addEventListener( MouseEvent.MOUSE_UP, EVT_HANDLER_mouseUp, false, 0, true );
			SCRB_status = true;
		};
		public function EVT_HANDLER_mouseMove( e:MouseEvent ):void 
		{
			if( SCRB_status ) render( e.stageY );
		};
		public function EVT_HANDLER_rollOut( e:MouseEvent ):void 
		{
			if( e.buttonDown ){
				e.target.stage.addEventListener( MouseEvent.MOUSE_UP, EVT_STAGE_releaseOutside, false, 0, true );
			}
			e.target.removeEventListener( MouseEvent.ROLL_OUT, EVT_HANDLER_rollOut );
		};
		public function EVT_HANDLER_mouseUp( e:MouseEvent ):void 
		{
			SCRB_status = false;
			e.target.stage.removeEventListener( MouseEvent.MOUSE_MOVE, EVT_STAGE_mouseMove );
			e.target.stage.removeEventListener( MouseEvent.MOUSE_UP, EVT_HANDLER_mouseUp );
		};
		
		
/*
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                        __         
   ________  ____  ____/ /__  _____
  / ___/ _ \/ __ \/ __  / _ \/ ___/
 / /  /  __/ / / / /_/ /  __/ /    
/_/   \___/_/ /_/\__,_/\___/_/     
                                   
*/
		
		public function render( Y:int ):void 
		{
			targetHeight = target.height;
			SCRB_maxHeight = stage.stageHeight - marginTop - marginBottom;
			this.y = marginTop;
			
			var backgroundHeight:int = SCRB_maxHeight;
			if(backgroundHeight<40) backgroundHeight = 40;
			SCRB_BACKGROUND.height = backgroundHeight;
				
			if(target != null)
			{
				if( targetHeight > SCRB_maxHeight )
				{
					
					SCRB_HANDLER.visible  = true;
					SCRB_BACKGROUND.alpha = 1;
					var yTarget:int;
					var delta:int = Y - SCRB_scrollY;
					var handlerHeight:int = Math.floor( ( backgroundHeight * SCRB_maxHeight / targetHeight) / 1 );
					if( handlerHeight < 30) handlerHeight = 30;
					SCRB_HANDLER.height = handlerHeight;
					if( delta <= -SCRB_handlerY ) delta = -SCRB_handlerY;
					if( delta > backgroundHeight - handlerHeight - SCRB_handlerY ) delta = Math.floor( backgroundHeight - handlerHeight - SCRB_handlerY );
					var SCRB_handlerNewY:int = SCRB_handlerY + delta;
					SCRB_HANDLER.y = SCRB_handlerNewY;
					yTarget = Math.floor( marginTop - ( ( SCRB_handlerNewY * ( targetHeight - SCRB_maxHeight ) / ( backgroundHeight - handlerHeight ) ) ) );
					target.y = yTarget;
				
					trace( "FullScrollbar: "+String( Math.floor(SCRB_handlerNewY * 100 / ( backgroundHeight - handlerHeight ) ) )+"%" );
				} 
				else 
				{
					SCRB_HANDLER.y = 0;
					SCRB_scrollY = 0;
					target.y = marginTop;
					SCRB_HANDLER.visible  = false;
					SCRB_BACKGROUND.alpha = .2;
				}
				
			}
				
		};
		
		
		

	}
}