How to use a ListEditor with a backing list

Hi all,

sorry for spamming this group a bit at the moment, but i am really stuck on several fronts.

I have a parent presenter which works fine. I stripped it down to a few lines to make it easier do discuss:

public class ContainerEditorDialogPresenterWidget extends PresenterWidget<ContainerEditorDialogPresenterWidget.MyView> implements

ContainerEditorDialogUiHandlers {

//Constructor, view interface removed ...

    private ContainerDto currentContainerDTO = null;

    

    private SimpleBeanEditorDriver<ContainerDto, ?> driver;

@Override

public void onReveal() {

   super.onReveal();

   driver.edit(currentContainerDTO); // this will populate your view with the data from your POJO

}

    @Override

    protected void onBind() {

    super.onBind();

      driver = getView().createEditorDriver();

    }

    

    @Override

    public void updateContainer() {

ContainerDto container = driver.flush();

//Here the groupList is null

eventBus.fireEvent(new ContainerUpdatedEvent(container));

}

    

}

I guess this is fine. I have a child-editor declared in the view:

@UiField GroupListEditor groupListEditor;

and it looks like this:

public class GroupListEditor extends Composite implements

IsEditor<ListEditor<String, GroupItemEditor>> {

private static StringListEditorUiBinder uiBinder = GWT

.create(StringListEditorUiBinder.class);

interface StringListEditorUiBinder extends

UiBinder<Widget, GroupListEditor> {

}

@UiField

FlowPanel pWidget;

@UiField

PushButton bAdd;

@UiField

FlowPanel pList;

ArrayList<String> backingList = new ArrayList<String>();

private class StringItemEditorSource extends EditorSource<GroupItemEditor> {

@Override

public GroupItemEditor create(final int index) {

GroupItemEditor subEditor = new GroupItemEditor();

pList.insert(subEditor, index);

subEditor

.addDeleteHandler(new EditorDeleteEvent.EditorDeleteHandler() {

public void onEditorDeleteEvent(EditorDeleteEvent event) {

remove(index);

}

});

return subEditor;

}

@Override

public void dispose(GroupItemEditor subEditor) {

subEditor.removeFromParent();

}

@Override

public void setIndex(GroupItemEditor editor, int index) {

pList.insert(editor, index);

}

}

private ListEditor<String, GroupItemEditor> editor = ListEditor

.of(new StringItemEditorSource());

public GroupListEditor() {

initWidget(uiBinder.createAndBindUi(this));

editor.setValue(this.backingList);

}

@UiHandler("bAdd")

void onBAddClick(ClickEvent event) {

Log.debug("Add button clicked");

add();

}

private void add() {

String s = "Stuff";

editor.setValue(this.backingList);

editor.getList().add(s);

}

@Override

public ListEditor<String, GroupItemEditor> asEditor() {

return editor;

}

private void remove(final int index) {

editor.getList().remove(index);

}

}

What i do not understand: How do i associate the backing list with this sub-editor? Convention says that by calling the Editor groupListEditor, it edits the groupList property of the ContainerDto. But the backing list is still empty. Then i tried to assign the backing list with a call to groutListEditor.asEditor() fromt the parent view, the list does still not get set. 
When i do it in the same method like in the add() above:

editor.setValue(this.backingList);

editor.getList().add(s);

I can add an item and get it displayed in the GUI. But when i flush the driver in the parent presenter, calling getGroupList() returns null.

What would be the right way to do it?

Thanks you very much!

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