Flex Canvas组件放大缩小

拓展canvas组件，使其里面的组件能够放大，缩小，滚轮放大缩小，鼠标点击移动。

package cn.ipanel.zzt.toolBarContainer  
{  
 import flash.display.DisplayObject;  
 import flash.events.MouseEvent;  
   
 import mx.containers.Canvas;  
 import mx.containers.HBox;  
 import mx.controls.Button;  
 import mx.core.UIComponent;  
 import mx.effects.Zoom;  
  
 public class ToolBarContainer extends Canvas  
 {  
    
  private var isDrag:Boolean;  
  private var quote:Number=1;  
  private var fitQuote:Number=1;  
  private var zoomAll:Zoom;  
  private var zoomChanged:Boolean;  
    
  private var obj:UIComponent;  
    
  public function ToolBarContainer()  
  {  
   //TODO: implement function  
   super();  
     
   addToolBtn();  
     
   this.addEventListener(MouseEvent.MOUSE_DOWN,mouseDownHandler);  
   this.addEventListener(MouseEvent.MOUSE_MOVE,mouseMoveHandler);  
   this.addEventListener(MouseEvent.MOUSE_UP,mouseUpHandler);  
   this.addEventListener(MouseEvent.MOUSE_WHEEL,mouseWheelHandler);  
  }  
    
  override public function addChild(child:DisplayObject):DisplayObject{  
   var displayObject:DisplayObject=super.addChild(child);  
     
   if(this.numChildren>1){  
    obj=this.getChildAt(1) as UIComponent;  
      
    this.setChildIndex(obj,0);  
    zoomAll=new Zoom();  
    zoomAll.startDelay=50;  
    zoomAll.duration=200;  
    zoomAll.target=obj;  
      
   }  
   return displayObject;  
  }  
    
  //初始化添加工具栏  
  private function addToolBtn():void{  
     
   var hBox:HBox=new HBox();  
   hBox.x = 10;  
   hBox.y = 10;  
   hBox.setStyle("fontSize",12);  
   var zoomInBtn:Button=new Button();  
   zoomInBtn.width=60;  
   zoomInBtn.height=20;  
   zoomInBtn.label="放大";  
   zoomInBtn.addEventListener(MouseEvent.CLICK,zoomIn);  
   hBox.addChild(zoomInBtn);  
     
   var zoomOutBtn:Button=new Button();  
   zoomOutBtn.width=60;  
   zoomOutBtn.height=20;  
   zoomOutBtn.label="缩小";  
   zoomOutBtn.addEventListener(MouseEvent.CLICK,zoomOut);  
   hBox.addChild(zoomOutBtn);  
     
   var zoomFitBtn:Button=new Button();  
   zoomFitBtn.width=60;  
   zoomFitBtn.height=20;  
   zoomFitBtn.label="适合";  
   zoomFitBtn.addEventListener(MouseEvent.CLICK,fitToContent);  
   hBox.addChild(zoomFitBtn);  
     
   this.addChild(hBox);  
  }  
    
  //放大  
  private function zoomIn(e:MouseEvent):void{  
   this.zoomInObj();  
  }  
    
  private function zoomInObj():void{  
   if(quote<2){//控制放大率  
    if(zoomAll.isPlaying){  
    }else{  
     zoomChanged=true;  
       
     zoomAll.zoomHeightFrom=quote;  
     zoomAll.zoomHeightTo=quote+0.22;  
     zoomAll.zoomWidthFrom=quote;  
     zoomAll.zoomWidthTo=quote+0.22;  
       
     quote=quote+0.22;  
     zoomAll.play();  
    }  
   }  
  }  
    
  //缩小  
  private function zoomOut(e:MouseEvent):void{  
   this.zoomOutObj();  
  }  
    
  private function zoomOutObj():void{  
     
   if(quote>0.09){//控制缩小率  
    if(zoomAll.isPlaying){  
    }else{  
     zoomChanged=true;  
       
     zoomAll.zoomHeightFrom=quote;  
     zoomAll.zoomHeightTo=quote-0.22;  
     zoomAll.zoomWidthFrom=quote;  
     zoomAll.zoomWidthTo=quote-0.22;  
       
     quote=quote-0.22;  
     zoomAll.play();  
    }  
   }  
  }  
    
  //适合  
  private function fitToContent(e:MouseEvent):void{  
   if(zoomAll.isPlaying){}else{  
    zoomAll.zoomHeightFrom=quote;  
    zoomAll.zoomHeightTo=fitQuote;  
    zoomAll.zoomWidthFrom=quote;  
    zoomAll.zoomWidthTo=fitQuote;  
      
    quote=fitQuote;  
    zoomAll.play();  
   }  
  }  
    
    
    
  private function mouseDownHandler(event:MouseEvent):void{  
   if(event.target is Button){  
    isDrag=false;  
   }else{  
    isDrag=true;  
   }  
  }  
    
  private function mouseMoveHandler(event:MouseEvent):void{  
   if(isDrag){  
    //鼠标放在容器内;  
    this.setChildIndex(obj,0);  
    obj.startDrag();  
   }  
  }  
    
  private function mouseUpHandler(event:MouseEvent):void{  
   isDrag=false;  
   obj.stopDrag();  
  }  
  //鼠标滚轮操作；  
  private function mouseWheelHandler(event:MouseEvent):void{  
   if(event.delta>0){  
    this.zoomIn(event);  
   }else{  
    this.zoomOut(event);  
   }  
  }  
    
    
 }  
}  

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/xiaoxin888888/archive/2009/07/08/4332353.aspx