Checkbox Cell and Selectable Cell Table rows

Question

I have a GWT 2.4 DataGrid associated with a SingleSelectionModel. One of the columns in the grid is a CheckboxCell, but it is not used for selection, but to set a boolean field value for the underlying item type of the row. My problem is that when I click on the checkbox, the row is selected first, then I have to click a second time to set/unset the checkbox. I would prefer that clicking outside of the checkbox does row selection, while clicking inside of the checkbox only sets/unsets the checkbox. Can anyone point me in the right direction on how to do this. I keep coming back to onBrowserEvent, but I'm not sure what to try.

Answer 1

There's a couple of approaches you can do, depending on what exactly you want to do it. Here are the two ideas that come to mind:

• Use a DefaultSelectionEventManager.CheckboxEventTranslator to blacklist the column
• Intercept it on a cell by cell basis with CellPreviewEvent.Handler and handle it on the DOM level by checking the EventTarget ("click".equals(event.getType())) and then use event.stopPropogation() when the EventTarget is of an input type "checkbox"

Answer 2

This code solved in my case a problemn very similar to yours.

Column<SomeBean, Boolean> checkboxColumn= new Column<SomeBean, Boolean>(new CheckboxCell(true,false))
{
    @Override
    public Boolean getValue(SomeBean object)
    {
        if(object == null || object.getId() == null)
           return null;
        return selectionModel.isSelected(object);
    }
};