pureMVC学习之一
//1
var
MainWindow: TMainWindow;
begin
Application.Initialize;
Application.MainFormOnTaskbar := True;
Application.CreateForm(TMainWindow, MainWindow);
ApplicationFacade.Startup(MainWindow);
Application.Run;
end.
//2
function ApplicationFacade: IApplicationFacade;
begin
Result := (TApplicationFacade.Instance as IApplicationFacade)
end;
//3
procedure TFacade.InitializeFacade;
begin
InitializeModel;
InitializeController;
InitializeView;
end;
//4 TApplicationFacade 调用父类的注册命令方法
procedure TApplicationFacade.InitializeController();
begin
/// call inherited to use the PureMVC Controller Singleton.
inherited;
/// Otherwise, if you‘re implmenting your own
/// IController, then instead do:
/// if Assigned(FController) then Exit;
/// FController = MyAppController.getInstance;
/// do any special subclass initialization here
/// such as registering Commands
RegisterCommand(MSG.Startup, TStartupCommand);
RegisterCommand(MSG.DELETE_USER, TDeleteUserCommand);
RegisterCommand(MSG.ADD_ROLE_RESULT, TAddRoleResultCommand);
end;
//5 TFacade 调用控制器注册命令方法
procedure TFacade.RegisterCommand(NotificationName: string;
CommandClass: TClass);
begin
FController.RegisterCommand(NotificationName, CommandClass);
end;
procedure TController.RegisterCommand(NotificationName: string; CommandType: TClass);
begin
Assert(CommandType.InheritsFrom(TCommand));//是否继承自TCommand
TMonitor.Enter(FSyncRoot);
try
if FCommandMap.ContainsKey(NotificationName) then Exit;//注册过的命令则放弃
// This call needs to be monitored carefully. Have to make sure that RegisterObserver
// doesn‘t call back into the controller, or a dead lock could happen.
FView.RegisterObserver(NotificationName, TObserver.Create(‘ExecuteCommand‘, Self));//视图注册观察者,收到此消息时即可调用消息对应的命类的执行方法
FCommandMap.Add(NotificationName, TCommandClass(CommandType));//控制器命令列表中增加新命令
finally
TMonitor.Exit(FSyncRoot);
end;
end;
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