因为TextField不支持对alpha的变换，因此需要对其进行一些操作，有两种方法：
第一是使用BitmapData去绘制，然后对Bitmap进行操作，这个方法代码量稍微偏多，这里不做赘述。
第二种是使用ColorMatrixFilter过滤器。
//Code:
package com.drore.map.view
{
import flash.display.Sprite;
import flash.events.Event;
import flash.text.TextField;
import flash.filters.ColorMatrixFilter;
/**
* 动态生成鼠标提示
* @author Dada http://www.asflex.cn
* @version 5.0
* @copy Drore http://www.drore.com
*/
public class MouseTip extends Sprite
{
private var txtTips:TextField = new TextField();
public function MouseTip()
{
addEventListener(Event.ENTER_FRAME, init);
}
private function init(event:Event):void
{
removeEventListener(Event.ENTER_FRAME, init);
txtTips.selectable = false;
txtTips.tabEnabled = false;
txtTips.mouseEnabled = false;
txtTips.cacheAsBitmap = true;
txtTips.multiline = false;
//设置滤镜
txtTips.filters=[new ColorMatrixFilter];
addChild(txtTips);
}
//设置提示文字
public function setText(txt:String):void
{
txtTips.text = txt;
txtTips.width = txtTips.textWidth + 10;
drawBg();
}
//绘制背景
private function drawBg():void
{
graphics.clear();
graphics.beginFill(0xF3E789, .8);
graphics.lineStyle(1, 0xFFFF00);
graphics.drawRoundRect( -5, -5, txtTips.textWidth + 15, txtTips.textHeight + 15, 10, 10);
graphics.endFill();
}
}
}
使用方法：
//Code:
//鼠标提示框
private var mtips:MouseTip = new MouseTip();
mtips.setText("This is a test sentense.");
//使用TweenLite对mtips进行alipa缓动
TweenLite.to(mtips, .3, { alpha:0 } );