CellTable ClickEvent(use SingleSelectionModel) & DoubleClickEvent

ClickEvent

// In my constructor.
selectionModel = new SingleSelectionModel<LightOwner>();

display.getOwnerTable().setSelectionModel(selectionModel);

// In the function I use for setting up all event handling.

selectionModel.addSelectionChangeHandler(new
SelectionChangeEvent.Handler() {
        public void onSelectionChange(SelectionChangeEvent event) {

                LightOwner selected = selectionModel.getSelectedObject();
                if (selected != null) {
                        History.newItem("edit-owner/"+selected.getId());
                }
        }
});

DoubleClickEvent

SingleSelectionModel<T> selectionModel = new SingleSelectionModel<T>();

cellTable.setSelectionModel(selectionModel);
cellTable.addDomHandler(new DoubleClickHandler() {

        @Override
        public void onDoubleClick(final DoubleClickEvent event) {
            T selected = selectionModel
                    .getSelectedObject();
            if (selected != null) {
                //DO YOUR STUFF

                                  }

        }
    }, 
    DoubleClickEvent.getType());