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pureMVC简单示例及其原理讲解四(Controller层)
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本節將講述pureMVC示例中的Controller層。
Controller層有以下文件組成：
- AddUserCommand.as
- DeleteUserCommand.as
- ModelPrepCommand.as
- ViewPrepCommand.as
- StartupCommand.as
AddUserCommand?。顧名思義，它是添加用戶命令。讓我們首先看看代碼。
Addusercommand.as代碼??
package?com.superwulei.controller??{??????import?com.superwulei.model.UserProxy;??????import?com.superwulei.model.vo.UserVO;????????????import?mx.controls.Alert;????????????import?org.puremvc.as3.interfaces.INotification;??????import?org.puremvc.as3.patterns.command.SimpleCommand;????????public?class?AddUserCommand?extends?SimpleCommand??????{??????????override?public?function?execute(notification:INotification):void??????????{????????????????????????????var?user:UserVO?=?notification.getBody()?as?UserVO;??????????????var?userProxy:UserProxy?=?facade.retrieveProxy(UserProxy.NAME)?as?UserProxy;????????????????????????????if(user.isValid){??????????????????userProxy.addItem(user);??????????????}else{??????????????????Alert.show("請檢查用戶名和密碼");??????????????}??????????}????????????????}??}?? ?AddUserCommand是一個單一命令（SimpleCommand），自定義SimpleCommand必須繼承SimpleCommand并重寫execute方法。execute方法表示這個命令的執行。曾經在上一篇《pureMVC簡單示例及其原理講解——View層?》中提到的添加用戶的邏輯代碼，應該在這里編寫。還記得上一篇中提到的“View層本身不處理各種操作，但是發送通知”么？
上一篇中發送通知的代碼 sendNotification(ApplicationFacade.USER_ADD,userForm.user);
?拿出這段代碼是特意的想說明AddUserCommand的execute方法中的notification.getBody()其實就是userForm.user，嚴謹的說應該是userFrom.user作為參數傳到execute方法中來。如此我們在這里通過userProxy.addItem(user)就實現了用戶的添加。userProxy中的users就多了一個user。
?
DeleteUserCommand?，刪除用戶命令。代碼如下，與添加用戶道理一樣，不多言。
Deleteusercommand deleteusercommand.as代碼??
package?com.superwulei.controller??{??????import?com.superwulei.model.UserProxy;??????import?com.superwulei.model.vo.UserVO;????????????import?org.puremvc.as3.interfaces.INotification;??????import?org.puremvc.as3.patterns.command.SimpleCommand;????????public?class?DeleteUserCommand?extends?SimpleCommand??????{??????????override?public?function?execute(notification:INotification):void??????????{??????????????var?user:UserVO?=?notification.getBody()?as?UserVO;??????????????var?userProxy:UserProxy?=?facade.retrieveProxy(UserProxy.NAME)?as?UserProxy;??????????????userProxy.deleteItem(user);??????????}????????????????}??}?? ?ModelPrepCommand、ViewPrepCommand分別是Model層注冊和View層注冊。說道注冊就要道一道。在pureMVC中，一切總控制是facade，因此無論是Proxy、Mediator還是Command都要在facade中注冊。上面四個Command全部為SimpleCommand，最后一個StartupCommand為MacroCommand（復合命令）。StartupCommand包含了多個SimpleCommand，通過addSubCommand方法添加了子命令，并在之后在facade上注冊了AddUserCommand和DeleteUserCommand。
Modelprepcommand.as代碼??
package?com.superwulei.controller??{??????import?com.superwulei.model.UserProxy;????????????import?org.puremvc.as3.interfaces.INotification;??????import?org.puremvc.as3.patterns.command.SimpleCommand;????????public?class?ModelPrepCommand?extends?SimpleCommand??????{??????????override?public?function?execute(notification:INotification):void??????????{??????????????/*?注冊Model?*/??????????????facade.registerProxy(new?UserProxy());??????????}??????}??}?? ?
Viewprepcommand.as代碼??
package?com.superwulei.controller??{??????import?com.superwulei.view.UserFormMediator;??????import?com.superwulei.view.UserListMediator;????????????import?org.puremvc.as3.interfaces.INotification;??????import?org.puremvc.as3.patterns.command.SimpleCommand;????????public?class?ViewPrepCommand?extends?SimpleCommand??????{??????????override?public?function?execute(notification:INotification):void??????????{??????????????var?app:MyPureMVCdemo?=?notification.getBody()?as?MyPureMVCdemo;??????????????/*?注冊View?*/??????????????facade.registerMediator(new?UserFormMediator(app.userForm));??????????????facade.registerMediator(new?UserListMediator(app.userList));??????????}??????}??}?? ?
Startupcommand.as代碼??
package?com.superwulei.controller??{??????import?com.superwulei.ApplicationFacade;????????????import?org.puremvc.as3.patterns.command.MacroCommand;????????public?class?StartupCommand?extends?MacroCommand??????{??????????override?protected?function?initializeMacroCommand():void{??????????????addSubCommand(ModelPrepCommand);??????????????addSubCommand(ViewPrepCommand);??????????????/*?注冊添加、刪除用戶命令?*/??????????????facade.registerCommand(ApplicationFacade.USER_ADD,AddUserCommand);??????????????facade.registerCommand(ApplicationFacade.USER_DELETE,DeleteUserCommand);??????????}??????}??}?? ?通過使用facade的registerCommand就好象添加一個監聽器一樣，當有sendNotification發送出來的時候，就會有對應的Command的execute方法被執行。
Controller層包含的應該是整個應用程序的邏輯業務。
轉載于:https://www.cnblogs.com/fuland/p/3632847.html
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