Re: custom elementparser for UiBinder

ParentComponent class has 
@UiChild(tagname="ChildComponent")
public void add(ChildComponent c) {}

If the UiBinder has
<g:HTMLPanel>
<aj:ChildComponent ui:field="child1"></aj:ChildComponent>

Then it works

But if I have
<g:HTMLPanel>
<aj:ParentComponent ui:field="parent1">
<aj:ChildComponent ui:field="child1"></aj:ChildComponent>
</aj:ParentComponent>

Then I get a compoile error MyTest.ui.xml has no ui:field attribute for <package>.MyTest#child1

Any ideas? I'm stumped.

In your example you have named your custom @UiChild tag the same as one of your components (ChildComponent). Now things might be ambiguous as

<aj:ParentComponent ui:field="parent1">
   <aj:ChildComponent></aj:ChildComponent>

</aj:ParentComponent>

can now mean "call method annotated with @UiChild(tagname=ChildComponent)" or "add ChildComponent to ParentComponent". Looks like GWT gives @UiChild higher priority and thats why you get an error if you try to assign a ui:field to it. GWT thinks you are trying to assign ui:field to a @UiChild method call which does not work.

When you use @UiChild then your UiBinder file look like:

<my:CustomComponent>

   <my:leftaligned> <!-- all lower case, so it never clashes with possible class names of other widgets -->

      <g:FlowPanel ui:field="child1" />

   </my:leftaligned>

</my:CustomComponent>

class CustomComponent {

  @UiChild // by default GWT strips off the "add" prefix and uses lowercase(LeftAligned) as tag name

  void addLeftAligned(Widget w) {

     HasWidgets leftWidgets = getLeftContainer();

     leftWidgets.add(w);

  }

}

-- J.

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