Java SWT: widgetSelected vs widgetDefaultSelected

Question

For example I want to execute something when user clicks on a button. Which do I use? The documentation didn't appear to make it very clear

UPDATE

A quick test shows that Widget Selected is triggered but not Default Selected.

In TasksView.main()

TasksView view = new TasksView(shell, SWT.None);
TasksController controller = new TasksController(view);

In TasksController

public class TasksController extends ControllerAbstract {
    protected TasksView view;

    public TasksController(TasksView view) {
        this.view = view;
        view.addTaskListener(new AddTaskListener());
    }

    protected class AddTaskListener implements SelectionListener {

        @Override
        public void widgetDefaultSelected(SelectionEvent arg0) {
            System.out.println("Default Selected");

        }

        @Override
        public void widgetSelected(SelectionEvent arg0) {
            System.out.println("Widget Selected");

        }

    }
}

btw, Did I do MVC correctly?

Answer 1

Use widgetSelected. In fact, all the better is to simply extend SelectionAdapter and only override the widgetSelected method and completely ignore widgetDefaultSelected.

Answer 2

SelectionListener.widgetDefaultSelected(e) has a toolkit dependent behavior. I usually just invoke SelectionListener.widgetSelected(...). (Note that this is not the default in SelectionAdapter.widgetDefaultSelected(e) - you will have to do this yourself.