How to create ButtonGroup of JToggleButton's that allows to deselect the actual option?

Question

That's it. I need to create a ButtonGroup that allows to select a option or, if the user click on the selected option, deselect the item (nothing will be selected) and, of course, capture the event to do something.

Violence

That might not be intuitive for the user. Have you thought about making one option to represent the state/choice that would correspond to the deselection? – Proper

Answer 1

Just in case Jeff's link is broken in the future, here's what's described: you need to subclass ButtonGroup to allow a no-selection, and add your buttons to this buttongroup.

public class NoneSelectedButtonGroup extends ButtonGroup {

  @Override
  public void setSelected(ButtonModel model, boolean selected) {
    if (selected) {
      super.setSelected(model, selected);
    } else {
      clearSelection();
    }
  }
}

Phenice

Or an anonymous inner class will suffice, e.g., ButtonGroup myGroup = new ButtonGroup(){ /*code from above*/ }; – Leavenworth

@MarkJeronimus answer refines this to avoid clearing the selection calling button.setSelected(false) on a button/checkbox that is not selected. – Identity

Answer 2

This shows exactly how to do that https://dzone.com/articles/unselect-all-toggle-buttons

Script

Answer 3

I noticed weird behavior when doing button.setSelected(false) on a button/checkbox that is not selected. It deselected everything as if I deselected something.

I fixed it this way:

public class NoneSelectedButtonGroup extends ButtonGroup {

  @Override
  public void setSelected(ButtonModel model, boolean selected) {
    if (selected) {
      super.setSelected(model, selected);
    } else if (getSelection() != model) {
      clearSelection();
    }
  }
}

Brumby

Answer 4

Capture the event to do something. Also do the below.

@Override
public void actionPerformed(ActionEvent e) {
    ((JToggleButton)e.getSource()).setSelected(false);
}

EDIT: But there is no ButtonGroup involved.

Selfrespect

Answer 5

Solution for pre java 1.6

public class NoneSelectedButtonGroup extends ButtonGroup {
    private AbstractButton hack;

    public NoneSelectedButtonGroup() {
        super();
        hack = new JButton();
        add(hack);
    }

    @Override
    public void setSelected(ButtonModel model, boolean selected) {
        super.setSelected(selected ? model : hack.getModel(), true);
    }
}

Puebla