[AS3]ToolTip类的升级版

# package project.do93.pflip.view 
# { 
#      
#     import flash.accessibility.AccessibilityProperties; 
#     import flash.display.*; 
#     import flash.events.*; 
#     import flash.geom.Point; 
#     import flash.text.*; 
#     /**
#      * @link [e-mail]
#      * @author Kinglong
#      * @version 0.1
#      * @since 20090608
#      * @playerversion fp9+
#      * 热区提示
#      */  
#     public class ToolTip extends Sprite { 
#         private static var instance:ToolTip = null; 
#         private var label:TextField;         
#         private var area:DisplayObject; 
#         public function ToolTip() { 
#             label = new TextField(); 
#             label.autoSize = TextFieldAutoSize.LEFT; 
#             label.selectable = false; 
#             label.multiline = false; 
#             label.wordWrap = false; 
#             label.defaultTextFormat = new TextFormat("宋体", 12, 0x666666); 
#             label.text = "提示信息"; 
#             label.x = 5; 
#             label.y = 2; 
#             addChild(label); 
#             redraw(); 
#             visible = false; 
#             mouseEnabled = mouseChildren = false; 
#         } 
#          
#         private function redraw() { 
#             var w:Number = 10 + label.width; 
#             var h:Number = 4 + label.height;             
#             this.graphics.clear(); 
#             this.graphics.beginFill(0x000000, 0.4); 
#             this.graphics.drawRoundRect(3, 3, w, h, 5, 5);               
#             this.graphics.moveTo(6, 3 + h); 
#             this.graphics.lineTo(12, 3 + h); 
#             this.graphics.lineTo(9, 8 + h); 
#             this.graphics.lineTo(6, 3 + h); 
#             this.graphics.endFill(); 
#             this.graphics.beginFill(0xffffff); 
#             this.graphics.drawRoundRect(0, 0, w, h, 5, 5); 
#             this.graphics.moveTo(3, h); 
#             this.graphics.lineTo(9, h); 
#             this.graphics.lineTo(6, 5 + h); 
#             this.graphics.lineTo(3, h); 
#             this.graphics.endFill(); 
#         } 
#          
#         public static function init(base:DisplayObjectContainer) { 
#             if (instance == null) { 
#                 instance = new ToolTip(); 
#                 base.addChild(instance);                 
#             } 
#         } 
#          
#         public static function register(area:DisplayObject, message:String):void { 
#             if(instance != null){ 
#                 var prop:AccessibilityProperties = new AccessibilityProperties(); 
#                 prop.description = message; 
#                 area.accessibilityProperties = prop; 
#                 area.addEventListener(MouseEvent.MOUSE_OVER, instance.handler); 
#             } 
#         } 
#          
#         public static function unregister(area:DisplayObject):void { 
#             if (instance != null) { 
#                 area.removeEventListener(MouseEvent.MOUSE_OVER, instance.handler); 
#             } 
#         } 
#          
#         public function show(area:DisplayObject):void { 
#             this.area = area; 
#             this.area.addEventListener(MouseEvent.MOUSE_OUT, this.handler); 
#             this.area.addEventListener(MouseEvent.MOUSE_MOVE, this.handler); 
#             label.text = area.accessibilityProperties.description; 
#             redraw();            
#         } 
#  
#          
#         public function hide():void { 
#             this.area.removeEventListener(MouseEvent.MOUSE_OUT, this.handler); 
#             this.area.removeEventListener(MouseEvent.MOUSE_MOVE, this.handler); 
#             this.area = null; 
#             visible = false; 
#         } 
#          
#         public function move(point:Point):void {              
#             var lp:Point = this.parent.globalToLocal(point); 
#             this.x = lp.x - 6;           
#             this.y = lp.y - label.height - 12; 
#             if(!visible){ 
#                 visible = true; 
#             } 
#         } 
#          
#         private function handler(event:MouseEvent):void { 
#             switch(event.type) { 
#                 case MouseEvent.MOUSE_OUT: 
#                     this.hide(); 
#                     break; 
#                 case MouseEvent.MOUSE_MOVE: 
#                     this.move(new Point(event.stageX, event.stageY));                    
#                     break; 
#                 case MouseEvent.MOUSE_OVER: 
#                     this.show(event.target as DisplayObject); 
#                     this.move(new Point(event.stageX, event.stageY)) 
#                     break; 
#             } 
#         } 
#          
#     } 
# }
调用：
# import project.do93.pflip.view.ToolTip; 
# var base:Sprite = new Sprite(); 
# addChild(base); 
# var sp:Sprite = new Sprite(); 
# sp.mouseEnabled=sp.mouseChildren=false; 
# addChild(sp); 
# //初始化ToolTip; 
# ToolTip.init(sp); 
# //与显示元素关联。 
# ToolTip.register(xxx_mc, "http://www.klstudio.com"); 
# ToolTip.register(btn1, "我是按钮1"); 
# ToolTip.register(btn2, "我是按钮2");