How to create ButtonGroup of JToggleButton's that allows to deselect the actual option?
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29-10-2019 - |
문제
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.
해결책
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();
}
}
}
다른 팁
This shows exactly how to do that http://java.dzone.com/articles/unselect-all-toggle-buttons
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();
}
}
}
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.
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);
}
}