教你7步实现flex自定义Event及参数传递

教你7步实现flex自定义Event及参数传递

Flex应用开发过程中如需要灵活的在不同组件（如A与B，父与子）之间响应事件，传递参数等功能时就会使用自定义事件（Event）机制,下面通过一个事例分七步,通过自定义Event和EventDispatcher两种机制实现事件交互和参数传递; 事例描述: 有一个父亲“parentApp.mxml”有两个儿子“comBrotherA.mxml”和\新年 降至，两个儿子为表孝心分别给他们老爸存入(事件)一笔过节费(事件参数),并通知老爸我存钱进去了，老爸在收到两个儿子的钱后汇总后同时告诉(事件)两 个儿子钱我已收到总数(事件参数)是多少...

1、第一步：引入自定义注册事件参数传递扩展类(来自网络)

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1. package myeventhelper 2. {

3. //自定义注册事件参数传递扩展类 4. public class EventArgExtend 5. {

6. public function EventArgExtend() 7. { 8. }

9. public static function create(f:Function,...arg):Function //动态参数创建 10. {

11. var F:Boolean = false;

12. var _f:Function = function(e:*,..._arg) 13. {

14. _arg = arg; 15. if(!F) 16. {

17. F = true;

18. _arg.unshift(e); 19. }

20. f.apply(null,_arg); 21. };

22. return _f; 23. }

24. public static function toString():String 25. {

26. return \

27. } 28. } 29.}

package myeventhelper { //自定义注册事件参数传递扩展类 public class EventArgExtend { public function EventArgExtend() { } public static function create(f:Functio { var F:Boolean = false; var _f:Function = function(e:*,..._ { _arg = arg; if(!F) { F = true; _arg.unshift(e); 2、第二步：自定义事件触发类： view plaincopy to clipboardprint?

1. package myeventhelper 2. {

3. import flash.events.EventDispatcher; 4.

5. import mx.core.UIComponent; 6. //自定义事件触发类

7. public class MyEventDispatcher extends EventDispatcher 8. {

9. private static var _instance:MyEventDispatcher;

10. public static const EXEC_PARENT_METHOD:String=\ntMethod\执行Parent方法

11. public static function getInstance():MyEventDispatcher

12. {

13. if(_instance==null){

14. _instance=new MyEventDispatcher(); 15. }

16. return _instance; 17. }

18. public var Source:UIComponent; //事件源对象 19. public var Parsms:Object; //主要用于参数传递 20. } 21.}

package myeventhelper { import flash.events.EventDispatcher; import mx.core.UIComponent; //自定义事件触发类 public class MyEventDispatcher extends Even { private static var _instance:MyEventDis public static const EXEC_PARENT_METHOD: public static function getInstance():My { if(_instance==null){ _instance=new MyEventDispatcher() } return _instance; } public var Source:UIComponent; //事件源 3、第三步：用户自定义事件类

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1. package myeventhelper 2. {

3. import mx.events.FlexEvent; 4. //用户自定义事件类

5. public class MyExtendEvent extends FlexEvent 6. {

7. public static const EXEC_BROTHER_METHOD:String=\cBrotherMethod\执行兄弟方法 8.

9. public var param:Object;

10. public function MyExtendEvent(o:Object,type:String, bubbles:Boolean=false, cancelable:Boolean=false) 11. {

12. super(type, bubbles, cancelable);

13. this.param = o;//也可通过这样的方式传递参数 14. } 15. } 16. }

package myeventhelper { import mx.events.FlexEvent; //用户自定义事件类 public class MyExtendEvent extends FlexEven { public static const EXEC_BROTHER_METHOD public var param:Object; public function MyExtendEvent(o:Object, { super(type, bubbles, cancelable); this.param = o;//也可通过这样的方式 } } } 4、第四步：完成儿子A“comBrotherA.mxml”：

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1.

2. 4. 27.

28.

29.

30.

31. 34.

35.

\36. 37.