Flash/Flex学习笔记(28)：动态文本的滚动控制

import flash.events.Event;
import flash.events.MouseEvent;

var flag:int = 0;

txtMsg.text = "这是一首很好听的歌：Going Home\nnot very often have we met \nbut the musics been too bad \ncan only sense happiness\nif the music is sad\nso, im going home \ni must hurry home\nwhere a life goes on \nwere too old to make a mess\ndreams will keep me young\nold enough to stress\nonly mirrors tell the time\nso, im going home\ni must hurry home\nso will my life go on\nyes, im going home \ngoing home alone \nand your life goes on\n菩提树下的杨过";
txtMsg.background = true;
txtMsg.border = true;
txtMsg.borderColor = 0x000000;
txtMsg.backgroundColor = 0xffff99;

btnUp.addEventListener(MouseEvent.ROLL_OVER,function(){flag=1});
btnDown.addEventListener(MouseEvent.ROLL_OVER,function(){flag=-1});

btnUp.addEventListener(MouseEvent.ROLL_OUT,ResetFlag);
btnDown.addEventListener(MouseEvent.ROLL_OUT,ResetFlag);


function ResetFlag(e:MouseEvent):void{
	flag = 0;
}

addEventListener(Event.ENTER_FRAME,EnterFrameHandler);

function EnterFrameHandler(e:Event):void {
	if (flag == 1) {
		txtMsg.scrollV--;
	}
	else if (flag==-1) {
		txtMsg.scrollV++;
	}
}