TextArea内按Enter发送消息并清空内容 换行
//下面三个变量用来保存KEY_DOWN事件时键盘的状态var shiftKey:Boolean;var ctrlKey:Boolean;var keyCode:int;var messageInput:TextArea;messageInput.addEventListener(KeyboardEvent.KEY_DOWN,onKeyDown);messageInput.addEventListener(TextEvent.TEXT_INPUT,onTextInput);private function onKeyDown(e:KeyboardEvent):void{//如果按下Enter时还按下Shift/Ctrl，则换行if( e.keyCode==Keyboard.ENTER && (e.shiftKey || e.ctrlKey) ){callLater(function():void{ //注意这个callLatervar msg:String = messageInput.text;var part1:String = msg.substring(0, messageInput.selectionBeginIndex);var part2:String = msg.substring(messageInput.selectionEndIndex, 0x7fffffff);var selIndex:int = messageInput.selectionBeginIndex + 1;messageInput.text = part1 + "\n" + part2;messageInput.setSelection(selIndex,selIndex);});keyCode = -1; //标识本次按键不需要TEXT_INPUT事件配合处理return;}shiftKey = e.shiftKey;ctrlKey = e.ctrlKey;keyCode = e.keyCode;}private function onTextInput(evt:TextEvent):void{if(keyCode == -1){return;}if(keyCode==Keyboard.ENTER && !shiftKey && !ctrlKey){evt.preventDefault();callLater(function():void{//sendMessage()即为发送消息的方法，它应该返回一个Boolean值，以此来决定是否清空消息框if( sendMessage(messageInput.text) ){messageInput.text = "";messageInput.htmlText = "";messageInput.setSelection(0,0);}});}}