package {

import flash.display.Loader;
import flash.net.URLRequest;
import flash.events.Event;
import flash.events.EventDispatcher;

public class SkinManager extends EventDispatcher {
public static const SKINCOMPLETE:String="skincomplete";
private static var instance:SkinManager=new SkinManager();
public var loader:Loader;

public function SkinManager() {
if (instance != null) {
throw new Error("不能直接创建对象");
}
loader=new Loader();
}
public static function getInstance():SkinManager {
return instance;
}
public function loadSkin(path:String):void {

loader.load(new URLRequest(path));
loader.contentLoaderInfo.addEventListener(Event.COMPLETE,completeHandler);
}
private function completeHandler(e:Event) {
//移除侦听器
loader.contentLoaderInfo.removeEventListener(Event.COMPLETE,completeHandler);
dispatchEvent(new Event(SkinManager.SKINCOMPLETE));//发布事件
}
public function getClass(className:String):Class {
try {
return loader.contentLoaderInfo.applicationDomain.getDefinition(className) as Class;
} catch (e:Error) {
throw new Error(className + " definition not found in " + e.toString());
}
return null;
}
}
}

package {
import Date;
import flash.display.Sprite;
import flash.events.Event;

public class Clock extends Sprite {

private var hour:Number;
private var minute:Number;
private var second:Number;
private var _hours:Sprite;
private var _minutes:Sprite;
private var _seconds:Sprite;

public function Clock(h:Sprite,m:Sprite,s:Sprite) {
//将传递进来的三个对象参数,赋给该时钟类的三个属性
this._hours = h;
this._minutes = m;
this._seconds = s;

init();
}
private function init() {
this.addEventListener(Event.ENTER_FRAME,enterFrameHandler);
}

private function enterFrameHandler(event:Event) {

var now:Date = new Date(); // 构造一个Date实例,Date 类的实例表示一个特定时间点
hour = now.getHours(); //获取系统当前的时，分，秒
minute = now.getMinutes();
second = now.getSeconds();
//下面控制时针、分针、秒针的旋转规律、旋转角度 ，后面进行具体解释
_hours.rotation = hour*30 + Math.floor(minute*6/12);
_minutes.rotation = minute*6 + Math.floor(second*6/60);
_seconds.rotation = second*6;

}
}
}

var container_mc:Sprite = new Sprite();
addChild(container_mc);
container_mc.x = stage.stageWidth/2;
container_mc.y = stage.stageHeight/2;

var sprite_name:Array = ["bg_mc","hours_mc","minutes_mc","seconds_mc"];
var class_name:Array = ["Bg","Hours","Minutes","Seconds"];
var _length:uint = class_name.length;
function completeHandler(e:Event) {
var _class:Class;
var new_sprite:Sprite;
for (var i=0; i<_length; i++) {
_class = skin_mc.getClass(class_name[i]);
new_sprite = new _class();
new_sprite.name = sprite_name[i];
container_mc.addChild(new_sprite);
}
create();
}
//创建一个时钟(Clock)类,传入三个参数,参数类型都是Sprite类型,
//它们分别是舞台上存在的三个影片剪辑元件,实例名分别为
//时针(hours_mc) , 分针(minutes_mc) , 秒针(seconds_mc)
function create() {
var a:Clock = new Clock(getItem("hours_mc"),getItem("minutes_mc"),getItem("seconds_mc"));
addChild(a);
}
function getItem(Name:String):* {
return container_mc.getChildByName(Name);
}