GWT ValueListBox Editor - gwt

Question

I'm puzzled about how to use GWT's ValueListBox with an Editor. I'm getting this ERROR:
The method setValue(String) in the type TakesValueEditor<String>
is not applicable for the arguments (List<String>)
Here's the relevant code.
public class MyBean {
private List<String> dateFormats;
public List<String> getDateFormats() {
return dateFormats;
}
public void setDateFormats(List<String> dateFormats) {
this.dateFormats = dateFormats;
}
}
public interface MyBeanView extends IsWidget, Editor<MyBean> {
#Path("dateFormats")
IsEditor<TakesValueEditor<String>> getDateFormatEditor();
}
public class MyBeanViewImpl implements MyBeanView {
#UiField(provided=true) ValueListBox<String> dateFormats;
public MyBeanViewImpl() {
dateFormats = new ValueListBox<String>(PassthroughRenderer.instance(),
new ProvidesKey<String>() {
#Override
public Object getKey(String item) {
return item;
}
});
dateFormats.setAcceptableValues(Arrays.asList(new String[] {"YYYY"}));
// ... binder.createAndBindUi(this);
}
#Override
public IsEditor<TakesValueEditor<String>> getDateFormatEditor() {
return dateFormats;
}
}
Here's what's in ui.xml with xmlns:g='urn:import:com.google.gwt.user.client.ui'>
<g:HTMLPanel>
Data Formats: <g:ValueListBox ui:field="dateFormats"> </g:ValueListBox>
</g:HTMLPanel>
I'm surely missing something obvious here. Much thanks.

Answer 1

The problem that you're running into has to do with trying to map the List<String> dateFormats from MyBean onto the ValueListBox<String> dateFormats editor. The datatypes are incompatible, since a ValueListBox<T> doesn't edit a List<T>, but instead a single instance of T chosen from a list provided by setAcceptableValues(). Given the example above, it would make sense for MyBean to have a String getDateFormat() property and rename the editor field to dateFormat.