The Ease of Angular with GWT

Let's see a quick example. Our framework builds with the standard GWT MVP, but we eliminated view and presenter interfaces. We are also relying on pure html templates, not gwt ui.xml-s or imperative UI building, but that's your choice.

Now let's say we have HTML template:

<span id="nameLabel"/>
<button id="myButton">Clickme</button>

And in the ViewImpl class:

new LightLabel("#nameLabel")
    .bind(bindOnPresenter().get(Presenter._labelText));
new LightButton("#myButton")
    .bind(presenterMethod(Presenter.__buttonClicked));

And the Presenter (that's also the Activity):

@ObservableAttribute
private String labelText;
[...]
@MethodRef
public void buttonClicked() {
    setLabelText("You clicked me!");
}

Note a few things:

• The example framework uses html templates, but you're actually free to use your own solution in ViewImpl classes
• The ViewImpl class is dumb: it merely declares components and their bindings.
• The bindings are easy to express with the magically generated property and method literals , but it's still typesafe, compile-time checked.
• In this example the presenter is also the model (it contains the labelText), but that's also your choice, you can put it in a different Model class.
• The presenter works with the model only. Changes are automatically propagated to the view and vice-versa. There's no need of a view or presenter interface, and you don't have to manually propagate data to the view components and manually fetch them when you need them in the presenter. They're just there.