Presenter with swappable sub-presenters

Question

Using GWT 2.4 with MVP, I have a presenter where the top portion can swap between a read-only presenter of a set of data or an editor for that data, depending on how you arrived at the page.

Without using GWTP, how can I swap between those two presenters and the underlying views?

Currently, the classes looks like this:

public class MainPagePresenter implements Presenter, MainPageView.Presenter, ParentPresenter {

    private MainPageViewview;
    private final ClientFactory clientFactory;
    private StaticDataPresenter staticPresenter;
    private SomeOtherPresenter otherPresenter;


}

I'd like for StaticDataPresenter to become some structure that can either hold a StaticDataPresenter or a DynamicDataPresenter that lets you edit.

Thanks for your input.

dting · Accepted Answer · 2012-04-21T22:03:12.820

public interface DataPresenter {
  void handleEdit();
}

public class StaticDataPresenter implements DataPresenter {
  @Override
  public void handleEdit() {
    // Do nothing.
  }
}

public class DynamicDataPresenter implements DataPresenter {
  @Override
  public void handleEdit() {
    // Do something.
  }
}

public class MainPagePresenter implements Presenter, MainPageView.Presenter, ParentPresenter {

  private MainPageView view;
  private final ClientFactory clientFactory;
  private DataPresenter dataPresenter;
  private SomeOtherPresenter otherPresenter;

  ...

  public void switchDataPresenter(DataPresenter dataPresenter) {
    this.dataPresenter = dataPresenter;
    DataPresenterView dataPresenterView = view.dataPresenterView();
    dataPresenterView.setPresenter(dataPresenter);
  }    
}

Thanks. I'll look at these solutions, both of which will work. — Brett Slocum, Apr 21 '12 at 21:53

score 1 · Answer 2 · answered Apr 21 '12 at 16:44

1

Your MainPageView can have a DeckPanel with both the StaticDataPresenter's view, and the SomeOtherPresenter's view.

MainPagePresenter can then tell the MainPageView to switch what is being displayed based on your needs.

answered Apr 21 '12 at 16:44

trevorism

411
2
7

Thanks. I'll look at these solutions, both of which will work. – Brett Slocum Apr 21 '12 at 21:55

score 0 · Answer 3 · answered May 18 '12 at 14:45

0

What I ended up doing was putting both editors on the page, and then turning on and off the visibility in the presenter.

Thanks for your suggestions. They helped.

answered May 18 '12 at 14:45

Brett Slocum

390
1
5
21

Presenter with swappable sub-presenters

3 Answers3