On 24 oct, 23:54, "fker...@gmail.com" <fker...@gmail.com> wrote:
> I have been
> studyinghttp://blog.appenginefan.com/search/label/Schluesselmeister
> application, and that got me to thinking about MVP... In that example,
> "Display" is about the same as "View", and "Controller" is like
> "Presenter". You inject the View to the Presenter through its
> constructor... but then the Presenter injects itself into the View by
> doing something like View.setPresenter(this);
>
> There are benefits, but having the View know about the Presenter seems
> odd.
>
> You could have:
> LoginPresenter.View interface:
> String getName( );
> String getPass( );
> void setPresenter(Presenter p);
>
> LoginView.Presenter interface:
> tryToLogin( )
>
> LoginPresenter implements LoginView.Presenter with something like:
> // call a remote service with myView.getName( ) and myView.getPass
> ( )
> // on callback, if the service agrees, initialize everything, show
> the menu, etc.
>
> LoginView implements LoginPresenter.View with something like:
> // add a click handler to its "login" button
> // which will call presenter.tryToLogin( )
>
> The LoginPresenter constructor looks like
> LoginPresenter(LoginView view ...and some other parameters...)
> myView = view;
> myView.setPresenter(this);
> ...
>
> This way of implementing things doesn't require sending events from
> the view to the presenter, or the presenter providing callbacks to the
> view... but somehow looks weird to me... any thoughts on it?
I'd rather use the following, though I understand why the
LoginView.Presenter interface could help with mocking (it's easier to
mock the view then, because you don't have to mock HasClickHandlers
and eventually HandlerRegistration and ClickEvent):
LoginPresenter.View interface:
String.getName()
String getPass()
HasClickHandlers getSignInButton()
The LoginPresenter constructor looks like:
LoginPresenter(LoginView view ...and some other parameters...)
this.view = view;
view.getSignInButton().addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
tryToLogin();
}
});
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