Search code examples
gwtuibinder

GoogleWebToolkit runtime dynamic layout activities

I use GWT on client side with activities&places. I got a layout (LeftSide - CenterSide - RightSide), and each side got it's own ActivityMapper + Activity + View.

I would like to add dynamically Views(With activity) to Sides. For Example if user's gender is male, then on left side display the AView+APresenter , and BView+BPresenter; but if user's gender is female display only BView+BPresenter.

Can anobody help me about how can I do that?

Thanks

Solution

  • You have to create a fourth ActivityMapper that returns null when needed.
    Its display region (AcceptsOneWidget) can possibly shrink/disappear when passed a null widget.

    See http://blog.ltgt.net/gwt-21-activities-nesting-yagni/ for more context and some sample code.

    However, if you're varying depending on the user, and do the authentication outside your app (meaning the app is loaded with a known user and it then never changes, or the app is reloaded with for other user), then you can simply decide at startup (onModuleLoad) whether to create that fourth ActivityMapper along with its ActivityManager and AcceptsOneWidget: 

    if (user.getGender() == Gender.MALE) {
  SimplePanel display = new SimplePanel();
  parent.add(display);

  ActivityManager manager = new ActivityManager(new MaleSpecificActivityMapper(), eventBus);
  manager.setDisplay(display);
}