/SparrowGUIv1/src/sparrowGui/components/ScrollPanel.as

package sparrowGui.components

{

	import flash.display.DisplayObject;

	import flash.display.DisplayObjectContainer;

	import flash.display.Sprite;

	import flash.events.Event;

	import flash.events.MouseEvent;

	

	import sparrowGui.utils.SparrowUtil;

	

	/**

	 * ???????

	 * 

	 * ????

	 * 

			

		var sp:ScrollPanel = new ScrollPanel();

		sp.x = 300;

		sp.source = cb;

		addChild(sp);

	 * 

	 * @author Pelephone

	 * @website http://cnblogs.com/pelephone

	 */

	public class ScrollPanel extends BaseUIComponent

	{

		/**

		 * ????????

		 */

		public static const VER_SCROLL_NAME:String = "vScroll";

		/**

		 * ????????

		 */

		public static const HOR_SCROLL_NAME:String = "hScroll";

		

		private var contDP:Sprite;

		/**

		 * ??????

		 */

		private var _source:DisplayObject;

		

		/**

		 * ?????????

		 */		

		private var maskDP:Sprite;

		

		private var _vScroll:VScrollBar;

		private var _hScroll:HScrollBar;

		

		private var _autoVhidden:Boolean = true;

		private var _autoHhidden:Boolean = true;

		

		private var _autoScroll:Boolean = true;

		

		private var _width:Number = 80;

		private var _height:Number = 80;

		

		/**

		 * ??????

		 * @param uiVars ????

		 */

		public function ScrollPanel(uiVars:Object=null)

		{

			super(uiVars);

			

			contDP = new Sprite();

			maskDP = new Sprite();

			contDP.mask = maskDP;

			

			var skinDC:DisplayObjectContainer = skin as DisplayObjectContainer;

			if(skinDC)

			{

				skinDC.addChild(contDP);

				skinDC.addChild(maskDP);

			}

			addSkinListen();

		}

		

		override protected function setUI(uiVars:Object=null):void

		{

			super.setUI(uiVars);

			

			var skinDC:DisplayObjectContainer = skin as DisplayObjectContainer;

			if(skinDC)

			{

				var vScrollSkin:DisplayObject = skinDC.getChildByName(VER_SCROLL_NAME);

				_vScroll = new VScrollBar(vScrollSkin);

				

				var hScrollSkin:DisplayObject = skinDC.getChildByName(HOR_SCROLL_NAME);

				_hScroll = new HScrollBar(hScrollSkin);

			}

		}

		

		/**

		 * ???????

		 */

		override protected function addSkinListen():void

		{

			vScroll.addEventListener(Event.CHANGE,onScrollVEvent);

			skin.addEventListener(MouseEvent.MOUSE_WHEEL, onMouseWheel);

			if(hScroll) hScroll.addEventListener(Event.CHANGE,onscrollHEvent);

		}

		

		/**

		 * ???????

		 */

		override protected function removeSkinListen():void

		{

			vScroll.removeEventListener(Event.CHANGE,onScrollVEvent);

			skin.removeEventListener(MouseEvent.MOUSE_WHEEL, onMouseWheel);

			if(hScroll) hScroll.removeEventListener(Event.CHANGE,onscrollHEvent);

		}

		

		/**

		 * ?????????

		 * @param e

		 */

		private function onScrollVEvent(e:Event):void

		{

			var scrollNum:Number = contDP.height - maskDP.height;

			contDP.y = -1 * vScroll.scrollPercent * scrollNum;

		}

		

		/**

		 * ?????????

		 * @param e

		 */

		private function onscrollHEvent(e:Event):void

		{

			var scrollNum:Number = contDP.width - maskDP.width;

			contDP.x = -1 * hScroll.scrollPercent * scrollNum;

		}

		

		/**

		 * ????

		 * @param event

		 */

		private function onMouseWheel(event:MouseEvent):void

		{

			var scrollDist:Number = sourceHeight - maskDP.height;

			vScroll.scrollPercent -= event.delta/scrollDist*2;

		}

		

		/**
		 * ?????????
		 */
		public function activeScroll():void
		{

			var scrollWidth:Number = this.width;

			var scrollHeight:Number = this.height;

			// ????????????

			if(contDP.height<=this.height){

				if(autoVhidden)

					vScroll.visible = false;

				else

				{

					vScroll.visible = true;

					vScroll.enabled = false;

					

					scrollWidth = this.width - (autoScroll?vScroll.width:0);

				}

			}

			else

			{

				vScroll.visible = true;

				vScroll.setSliderParams(this.height,contDP.height);

				

				scrollWidth = this.width - (autoScroll?vScroll.width:0);

			}

			if(autoScroll)

				vScroll.x = this.width - vScroll.width;

			

			if(!hScroll){

				if(autoScroll) vScroll.height = height;

				drawMask(scrollWidth,scrollHeight);

				return;

			}

			// ????????????

			if(contDP.width<=scrollWidth){

				if(autoHhidden)

					hScroll.visible = false;

				else

				{

					hScroll.visible = true;

					hScroll.enabled = false;

					scrollHeight = this.height - (autoScroll?hScroll.height:0);

				}

			}

			else

			{

				hScroll.visible = true;

				hScroll.setSliderParams(scrollWidth,contDP.width);

				scrollHeight = this.height - (autoScroll?hScroll.height:0);

			}

			// ?????????????

			if(autoScroll)

			{

				hScroll.y = this.height - hScroll.height;

			

				vScroll.height = this.height - (hScroll.visible?hScroll.height:0);

				hScroll.width = this.width - (vScroll.visible?vScroll.width:0);

			}

			

			

			drawMask(scrollWidth,scrollHeight);

		}

		

		/**

		 * ????

		 * @param w

		 * @param h

		 */

		private function drawMask(w:Number,h:Number):void

		{

			maskDP.visible = true;

			maskDP.graphics.clear();

			maskDP.graphics.beginFill(0xFFFF00);

			maskDP.graphics.drawRect(0,0,w,h);

			maskDP.graphics.endFill();

		}

		

		///////////////////////////////////////

		// get/set

		///////////////////////////////////////

		

		

		/**

		 * ????????

		 * @param picDP

		 */

		public function set source(picDP:DisplayObject):void

		{

			SparrowUtil.clearDisp(contDP);

			contDP.addChild(picDP);

			activeScroll();

			_source = picDP;

//			skin.addChildAt(picDP,skin.getChildIndex(contDP));

//			contDP.parent.removeChild(contDP);

//			_contDP = picDP;

		}

		

		public function get source():DisplayObject 

		{

			return _source;

		}

		

		/**

		 * ???????????

		 */

		public function get autoVhidden():Boolean

		{

			return _autoVhidden;

		}



		/**

		 * @private

		 */

		public function set autoVhidden(value:Boolean):void

		{

			_autoVhidden = value;

		}



		/**

		 * ???????????

		 */

		public function get autoHhidden():Boolean

		{

			return _autoHhidden;

		}



		/**

		 * @private

		 */

		public function set autoHhidden(value:Boolean):void

		{

			_autoHhidden = value;

		}



		/**

		 * ?????

		 */

		public function get vScroll():VScrollBar

		{

			return _vScroll;

		}



		/**

		 * ??????????????

		 */

		public function setVScroll(scrollSkin:Sprite):void

		{

			_vScroll = new VScrollBar(scrollSkin);

		}



		/**

		 * ?????

		 */

		public function get hScroll():HScrollBar

		{

			return _hScroll;

		}



		/**

		 * ??????????????

		 */

		public function setHScroll(scrollSkin:Sprite):void

		{

			_hScroll = new HScrollBar(scrollSkin);

		}



		override public function get width():Number

		{

			return _width;

		}



		override public function set width(value:Number):void

		{

			_width = value;

			activeScroll();

		}



		override public function get height():Number

		{

			return _height;

		}



		override public function set height(value:Number):void

		{

			_height = value;

			activeScroll();

		}

		

		/**
		 * ?????????
		 * @return 
		 */
		public function get sourceWidth():Number
		{
			return contDP.width;
		}

		

		/**

		 * ?????????

		 * @return 

		 */

		public function get sourceHeight():Number

		{

			return contDP.height;

		}



		/**

		 * ???????????

		 */

		public function get autoScroll():Boolean

		{

			return _autoScroll;

		}



		/**

		 * @private

		 */

		public function set autoScroll(value:Boolean):void

		{

			_autoScroll = value;

		}

		

		/**

		 * ???????????????

		 

		public function get contDP():Sprite

		{

			return _contDP;

		}*/

		

		override public function getDefaultUIName():String

		{

			return "scrollPanel"

		}

	}

}