actionscript3.0中的MVC,EventDispather,IEventDispather的学习
在as3.0中使用mvc来构建项目的时候，在model层，总免不了使用事件。在这个例子里，使用MVC创建了一个简单的数字时钟的功能。在model层，使用了4种方式来处理事件发送。并简单对比了一下。
方法1.model类继承自EventDispather
方法2.model类复合EventDispather
方法3.model类继承自Sprite
方法4.model类实现IEventDispatcher
当前代码注释默认设置方法1来实现,若设置对应的注释可以的尝试使用4种方法来实现这个简单的例子。
自我感觉除了方法2不太好以外，其它方法的都可行。
环境：Flash build4 ，sdk3.5
代码下载地址：https://files.cnblogs.com/bigbigdotnet/MVC.rar
程序运行效果：
文档类(程序入口):
Main.as
package
{
import Control.*;
import Model.*;
import View.*;
import flash.display.Sprite;
[SWF(width="200",height="100")]
public class Main extends Sprite
{
public function Main()
{
var model:Model_A = new Model_A();
//var model:Model_B = new Model_B();
//var model:Model_C = new Model_C();
//var model:Model_D = new Model_D();
var controller:Controller = new Controller(model);
var view:View = new View(model,controller);
addChild(view);
view.x = 30;
view.y = 30;
}
}
}
控制器(control)：
Controller.as
package Control
{
import flash.utils.Timer;
import flash.events.TimerEvent;
import Model.*;
public class Controller
{
private var model:Model_A;
//private var model:Model_B;
//private var model:Model_C;
//private var model:Model_D;
private var timer:Timer;
public function Controller(model:Model_A):void{
this.model = model;
}
public function startTime():void{
model.startTime();
}
}
}
视图器(view)：
View.as
package View
{
import Control.*;
import Model.*;
import flash.display.Sprite;
import flash.events.Event;
import flash.text.TextField;
public class View extends Sprite
{
private var model:Model_A;
//private var model:Model_B;
//private var model:Model_C;
//private var model:Model_D;
private var controller:Controller;
private var tf:TextField;
public function View(model:Model_A,controller:Controller):void{
this.controller = controller;
tf = new TextField();
addChild(tf);
controller.startTime();
this.model = model;
//Mode层为Model_A时使用:
model.addEventListener("action",onActionHandler);
//Mode层为Model_B时使用:
//model.getSender().addEventListener("action",onActionHandler);
//Mode层为Model_C时使用:
//model.addEventListener("action",onActionHandler);
//Mode层为Model_D时使用:
//model.addEventListener("action",onActionHandler);
}
private function onActionHandler(e:Event):void{
tf.text = "时间：" + model.hour+" : "+model.minutes+" : "+model.second;
trace(e.target);
//当使用方法2的时候，以下这段代码，将会报错！这是因为mode_B中创建_dispather的时候，没有将this的引用注入到_dispatcher里面，
//即是说,没有把mode_B类的引用注入到_dispatcher里，侦听函数的target对象指向的是dispatcher，而不是mode_B本身
//尽管在mode_B类中发送消息，可以这样写:dispatcher = new EventDispatcher();,但以下代码就会报错！
//而如果mode_B类中实现IEventDispather接口，同时这样写:dispatcher = new EventDispatcher( this );以下代码就会正确执行。
trace(e.target.hour);
}
}
}
模型器(model)：
方法一：Model_A.as
package Model
{
import flash.events.*;
import flash.utils.Timer;
//方法1：Model继承自EventDispatcher
public class Model_A extends EventDispatcher
{
public var hour :String;
public var minutes :String;
public var second :String;
public var timer :Timer;
public function Model_A(){}
public function startTime():void{
timer = new Timer(1000);
timer.addEventListener(TimerEvent.TIMER,onTimerHandler);
timer.start();
}
private function onTimerHandler(e:TimerEvent):void{
var nowDate:Date = new Date();
hour = nowDate.getHours() >9 ? String(nowDate.getHours()) :"0" + nowDate.getHours();
minutes = nowDate.getMinutes() >9 ? String(nowDate.getMinutes()):"0" + nowDate.getMinutes();
second = nowDate.getSeconds() >9 ? String(nowDate.getSeconds()):"0" + nowDate.getSeconds();
//直接继承自EventDispatcher所以直接调用dispatchEvent广播事件
dispatchEvent(new Event("action"));
}
}
}
方法二：Model_B.as
package Model
{
import flash.events.*;
import flash.utils.Timer;
//方法1：Model没有继承自EventDispatcher
public class Model_B
{
public var hour :String;
public var minutes :String;
public var second :String;
public var timer :Timer;
//定义一个EventDispatcher对象
public var _dispatcher :EventDispatcher;
public function Model_B(){
initSender();
}
public function startTime():void{
timer = new Timer(1000);
timer.addEventListener(TimerEvent.TIMER,onTimerHandler);
timer.start();
}
public function getSender():EventDispatcher{
return _dispatcher;
}
private function initSender():void{
_dispatcher = new EventDispatcher();
}
private function onTimerHandler(e:TimerEvent):void{
var nowDate:Date = new Date();
hour = nowDate.getHours() >9 ? String(nowDate.getHours()) :"0" + nowDate.getHours();
minutes = nowDate.getMinutes() >9 ? String(nowDate.getMinutes()):"0" + nowDate.getMinutes();
second = nowDate.getSeconds() >9 ? String(nowDate.getSeconds()):"0" + nowDate.getSeconds();
//调用_dispatchEvent广播事件
_dispatcher.dispatchEvent(new Event("action"));
}
}
}
方法三：Model_C.as
package Model
{
import flash.display.Sprite;
import flash.events.*;
import flash.utils.Timer;
//方法3：继承自Sprite,同时Sprite也是属于EventDispather类的子类，
public class Model_C extends Sprite
{
public var hour :String;
public var minutes :String;
public var second :String;
public var timer :Timer;
public function Model_C(){
}
public function startTime():void{
timer = new Timer(1000);
timer.addEventListener(TimerEvent.TIMER,onTimerHandler);
timer.start();
}
private function onTimerHandler(e:TimerEvent):void{
var nowDate:Date = new Date();
hour = nowDate.getHours() >9 ? String(nowDate.getHours()) :"0" + nowDate.getHours();
minutes = nowDate.getMinutes() >9 ? String(nowDate.getMinutes()):"0" + nowDate.getMinutes();
second = nowDate.getSeconds() >9 ? String(nowDate.getSeconds()):"0" + nowDate.getSeconds();
//直接调用Spreite所继承的EventDispather类的dispatchEvent广播事件
super.dispatchEvent(new Event("action"));
}
}
}
方法四：Model_C.as
package Model
{
import flash.events.*;
import flash.utils.Timer;
//方法4，Model直接实现IEventDispatcher，但要实现5个必须的方法
public class Model_D implements IEventDispatcher
{
public var hour :String;
public var minutes :String;
public var second :String;
public var timer :Timer;
private var _dispatcher:EventDispatcher;
public function Model_D(){
//this传进来很重要。也即是说把该类的引用传递给EventDispatcher.
//监听函数的target对象指向Model_D类的引用而不是_dispatcher;
_dispatcher = new EventDispatcher(this);
}
public function addEventListener(type:String, listener:Function, useCapture:Boolean=false, priority:int=0, useWeakReference:Boolean=false):void
{
_dispatcher.addEventListener(type,listener,useCapture,priority,useWeakReference);
}
public function removeEventListener(type:String, listener:Function, useCapture:Boolean=false):void
{
_dispatcher.removeEventListener(type,listener,useCapture);
}
public function dispatchEvent(event:Event):Boolean
{
return _dispatcher.dispatchEvent(event);
}
public function hasEventListener(type:String):Boolean
{
return _dispatcher.hasEventListener(type);
}
public function willTrigger(type:String):Boolean
{
return _dispatcher.willTrigger(type);
}
public function startTime():void{
timer = new Timer(1000);
timer.addEventListener(TimerEvent.TIMER,onTimerHandler);
timer.start();
}
private function onTimerHandler(e:TimerEvent):void{
var nowDate:Date = new Date();
hour = nowDate.getHours() >9 ? String(nowDate.getHours()) :"0" + nowDate.getHours();
minutes = nowDate.getMinutes() >9 ? String(nowDate.getMinutes()):"0" + nowDate.getMinutes();
second = nowDate.getSeconds() >9 ? String(nowDate.getSeconds()):"0" + nowDate.getSeconds();
//调用dispatchEvent广播事件
_dispatcher.dispatchEvent(new Event("action"));
}
}
}
