Flex 文本控件实现自定义复制粘贴

由于添加了自定义右键菜单，导致Textinput控件默认的右键复制粘贴功能被屏蔽了。最后通过JS脚本实现这个功能，参考代码如下

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" creationComplete="init()">
    <s:layout>
        <s:VerticalLayout/>
    </s:layout>
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
        <fx:XML id="jsxml" >
            <script>
                <![CDATA[
                
                    function clipboardOperator(type,browsername,txt){
                        if(type!="init"){
                            if(type=="copy"){
                                window.clipboardData.setData("Text", txt);
                                return;
                            }
                            else if(type=="paste"){
                                var clipboard=window.clipboardData.getData("Text"); 
                                if(clipboard == null){
                                    alert('您的剪切板中没有任何文本内容');
                                    return ;
                                }
                                else
                                    return clipboard;        
                            }
                        }
                    }
                ]]>
            </script>
        </fx:XML>
    </fx:Declarations>
    <fx:Script>
        <![CDATA[
            import Class.URLUtil;
            
            import flash.external.ExternalInterface;
            
            import flash.desktop.Clipboard;
            import flash.desktop.ClipboardFormats;
            import mx.controls.Alert;
            
            private var browsername:String=URLUtil.getBrowserName();
            
            private function init():void{
                
                lbpaste.text=ExternalInterface.call(jsxml, "init"); 
            }
            
            protected function btncopy_clickHandler(event:MouseEvent):void
            {
                //内部复制功能
                Clipboard.generalClipboard.clear();
                Clipboard.generalClipboard.setData(ClipboardFormats.TEXT_FORMAT,txt.text,false);
                //调用JS脚本实现复制
//                ExternalInterface.call("copypasteOperator","copy", txt.text);
            } 
            
            protected function btnpaste_clickHandler(event:MouseEvent):void
            {
                lbpaste.text=ExternalInterface.call("clipboardOperator","paste",browsername);
            }
        ]]>
    </fx:Script>
    <s:TextInput id="txt" text="aaa"/>
    <s:Button id="btncopy" label="复制" click="btncopy_clickHandler(event)"/>
    <s:Button id="btnpaste" label="粘贴" click="btnpaste_clickHandler(event)"/>
    <s:Label id="lbpaste"/>
</s:Application>

注：目前只支持IE和搜狗浏览器