Editor not getting ListBox changes - gwt

Question

Issue: On load of a form, ParentEditor, a sub-editor, ThisEditor, properly
popluates all its fields including a listbox(dropdown) widget, MyWidget. However,if I select a new option in the listbox and save, it doesn't save the newly selected option; though edits to other widgets are saving fine. It appears that on a driver flush, the editor does not get the value in my listBox. In debug mode, on driver.edit, I can see the TakesValueEditor call setValue(value) on all form widgets including the listbox. But on flush, I can see the TakesValueEditor call its getValue() on other form widgets but
not on my listbox.
The editor hierarchy: ParentEditor > ThisEditor > MyWidget. ParentEditor is the entire form. ThisEditor is a sub-section of the form. MyWidget is a custom listbox in ThisEditor section.
I'm using MVP pattern. Below are sample code snippets of the View and Presenter:
VIEW:
/** ThisEditor is a sub-section of ParentEditor (the Form) and contains a
MyWidget (custom listbox). */
public class ThisEditor extends Composite implements Editor<ThisProxy>, ThisView {
... //rfeDriver interface defined and created here
#UiField
MyWidget my; //getMy and setMy methods in ThisProxy
... //other field declarations
public ThisEditor() {
initWidget(binder.createAndBindUi(this));
}
#Override
public MyView getMy() {
return my;
}
... //other methods
}
/** This is the View interface that MyWidget implements */
public interface MyView extends HasOptions, HasValue<MyProxy>, Focusable {
interface Presenter {
...
}
...
}
public class MyWidget extends Composite implements MyView,
IsEditor<LeafValueEditor<MyProxy>> {
...
#UiField
ListBox listBox; //single-select dropdown
...
public MyWidget() {
initWidget(binder.createAndBindUi(this));
addChangeHandler(); //listen to changes to listBox and setSelectedIndex (?)
}
...
#Override
public int getSelectedIndex() {
return listBox.getSelectedIndex();
}
#Override
public void setSelectedIndex(int index) {
listBox.setSelectedIndex(index);
}
...
/**
* Called by the TakesValueEditor on rfeDriver.edit.
*/
#Override
public MyProxy getValue() {
//ask presenter for the MyProxy object -- presenter calls
//getSelectedIndex() on this widget and returns the object associated
//with the index
return presenter.getValue();
}
/**
* Called by the TakesValueEditor on rfeDriver.flush.
*/
#Override
public void setValue(MyProxy value) {
//pass the value to the presenter to parse and set the index that corresponds
//to this object
presenter.setValue(value);
}
PRESENTER
public class MyPresenter implements MyView.Presenter,
ValueLookupCompleteEventHandler {
...
protected HasOptions view;
private List<MyProxy> myList;
public MyPresenter(ParentPresenter parent) {
//setParent for this child presenter
}
... //methods to set view and create association between view and presenter
#Override
public MyProxy getValue() {
//identify the current selection
String selectedId = view.getValue(view.getSelectedIndex());
if (selectedId != null) {
//iterate myList to find the MyProxy object whose id.equals(selectedId)
for (Iterator<MyProxy> i = myList.iterator(); i.hasNext();) {
MyProxy value = i.next();
if (selectedId.equals(value.getCode().toString())) {
return value;
}
}
}
return null;
}
#Override
public void setValue(MyProxy value) {
//handle null value
String selectedId = value.getCode().toString();
... //verify the value is in myList
//traverse dropdown list and set selected index corresponding to value object
for (int i = 0; i < view.getItemCount(); ++i) {
if (selectedId.equals(view.getValue(i))) {
view.setSelectedIndex(i);
}
}
}
}

Answer 1

I just ran into this same issue. If you look at the source code for the GWT ListBox, you'll se e that it does not implement isEditor. I actually don't think it is a GWT editor component. Hard to understand. I had to code around it.