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  • Cairngorm的command并不是一直存在,而是触发一次就创建一次command类的实例

    注册的每个command类都存放到了一个Dictionary里面,每次需要用到的时候都是实例化了一次。这是cairngorm旧版本里的代码:

    private var commands : Dictionary = new Dictionary();
    
     public function addCommand( commandName : String, commandRef : Class ) : void
          {
             if( commands[ commandName ] != null )
             {
                throw new CairngormError(
                   CairngormMessageCodes.COMMAND_ALREADY_REGISTERED, commandName );
             }
             
             commands[ commandName ] = commandRef;
             CairngormEventDispatcher.getInstance().addEventListener( commandName, executeCommand );
          }
          
          protected function executeCommand( event : CairngormEvent ) : void
          {
             var commandToInitialise : Class = getCommand( event.type );
             var commandToExecute : ICommand = new commandToInitialise();
    
             commandToExecute.execute( event );
          }
          
          /**
           * Returns the command class registered with the command name. 
           */
          protected function getCommand( commandName : String ) : Class
          {
             var command : Class = commands[ commandName ];
             
             if ( command == null )
             {
                throw new CairngormError(
                   CairngormMessageCodes.COMMAND_NOT_FOUND, commandName );
             } 
                
             return command;
          }   
    

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  • 原文地址:https://www.cnblogs.com/JD85/p/1956682.html
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