GWT celltable custom column setfieldupdater not working for ListBox

Question

I have created a custom cell that determines whether to display a SelectionCell or TextCell. In the case of a SelectionCell render, I am unable to get the setFieldUpdater method to fire.

Code below...

private class CustomTypeCell extends AbstractCell<String>
{
    SelectionCell selectCell = new SelectionCell(cardMnemonics);
    TextCell textCell = new TextCell();

    @Override
    public void render(
            Context context,
            String value, SafeHtmlBuilder sb)
    {
        if (value != null)
        {
            textCell.render(context, value, sb);
        }
        else
        {
            selectCell.render(context, "", sb);
        }

    }
}


    private class CustomTypeColumn extends Column<Object, String>
{

    public CustomTypeColumn(CustomTypeCell cell)
    {
        super(cell);
    }

    @Override
    public String getValue(Object object)
    {
        return object.getStringValue();
    }
}

Implemented using...

CustomTypeCell cell = new CustomTypeCell();
CustomTypeColumn customCol = new CustomTypeColumn(cell);

customCol.setFieldUpdater(new FieldUpdater<Object, String>()
    {
        public void update(int index, Object object, String value)
        {
            object.setStringValue(value);
            // perform action           }
    });
cellTable.addColumn(customCol, "Custom Column");

This works fine if i use a standard Column with SelectionCell.

Answer 1

Rendering is not enough, you also want to delegate the event handling to the appropriate cell implementation: add your if/else construct into onBrowserEvent, and make sure you listen for the appropriate events in getConsumedEvents.
You should probably also implement resetFocus.

You'll probably find inspiration in the CompositeCell code.