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javagwtuibinder

Binding Ui to java interface using UiBinder in GWT

Let's say I have an interface A which is implemented by classes B and C.

public class B implements A extends Composite {}
public class C implements A extends Composite {}

I created another class D which binds to Ui using UiBinder in GWT.

public class D {
  public A widget;
  ...
  // binds to D.ui.xml
  ...
}

D.ui.xml

 ...
 <A ui:field='widget'>
 ...

B and C are widgets that bind to their own ui.xml files and are injected into class D under different conditions.

When I try binding UI to interface A (which is either B or C depending on the binding notation) in class D, I get "Expecting only widgets" error which in understandable considering the fact that A doesn't implement Composite or Widget class.

Is there a way to accomplish this behavior, I do not want to create different versions of class D for each behavior?

Solution

  • A could extend IsWidget. Also, obviously, make sure your widget field is @UiField(provided=true)