It's possible to set a null field to a non-null value by making a Leaf
CompositeEditor. I'll update the DynaTableRf sample with something
better than this, but I think it demonstrates the point. The
assumption is that PersonProxy.getManager() returns null in the
default dataset.
public class ManagerSelector extends Composite implements
CompositeEditor<PersonProxy, PersonProxy, NameLabel>,
LeafValueEditor<PersonProxy> {
private EditorChain<PersonProxy, NameLabel> chain;
private NameLabel nameLabel = new NameLabel(new SimpleEventBus());
private PersonProxy manager;
public ManagerSelector() {
FlowPanel fp = new FlowPanel();
Button b = new Button("Choose randomly");
b.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
DynaTableRequestFactory rf = DynaTableRf.getRequestFactory();
int i = new Random().nextInt(100);
rf.schoolCalendarRequest().getPeople(i, 1).to(
new Receiver<List<PersonProxy>>() {
@Override
public void onSuccess(List<PersonProxy> response) {
assert response.size() == 1;
setValue(response.get(0));
}
}).fire();
}
});
fp.add(b);
fp.add(nameLabel);
initWidget(fp);
}
public void flush() {
}
public String getPathElement(NameLabel subEditor) {
return "";
}
public PersonProxy getValue() {
return manager;
}
public void onPropertyChange(String... paths) {
}
public void setDelegate(EditorDelegate<PersonProxy> delegate) {
}
public void setEditorChain(EditorChain<PersonProxy, NameLabel> chain) {
this.chain = chain;
}
public void setValue(PersonProxy value) {
this.manager = value;
if (manager != null) {
chain.attach(manager, nameLabel);
}
}
--
Bob Vawter
Google Web Toolkit Team
--
http://groups.google.com/group/Google-Web-Toolkit-Contributors
