CODEWITHSUNDEEP
javaswingactionlistenerjcheckbox
ManInMoon
ManInMoon

Reputation: 7005

How do I make JCheckBox work the way I want

I have created a toolbar with a spinner and a checkbox.

The spinner works as I expect. When I change the value, the listener is called AND the spinner value is CHANGED.

BUT, for checkbox, the listener is fired when I move over it (unlike spinner) AND ODDLY checked value does NOT GET CHANGED unless I remove the JOptionPabe statement. How should I write CheckBox?

final JSpinner spin2 = new JSpinner();
        spin2.setModel(new SpinnerNumberModel(10, 1, 3000, 1));
        ChangeListener listener2 = new ChangeListener() {       
            @Override
            public void stateChanged(ChangeEvent e) {
                // TODO Auto-generated method stub
                JOptionPane.showMessageDialog(null,"Spinner change");
                //show();
            }
            };
        spin2.addChangeListener(listener2);
        toolBar.add(spin2);

    final JCheckBox AlertAudible = new JCheckBox("Audible");
        AlertAudible.setSelected(true);
        AlertAudible.setText("Audible");
        AlertAudible.setForeground(Color.WHITE);
        ChangeListener listener4 = new ChangeListener() {       
            @Override
            public void stateChanged(ChangeEvent e) {
                // TODO Auto-generated method stub

                JOptionPane.showMessageDialog(null,"Alert check");
                //starterModule.sigmaAlertAudible = AlertAudible.isSelected();
                //show();
            }
            };

OK I changed it to an ItemListener:

    ItemListener listener4 = new ItemListener() {
        @Override
            public void itemStateChanged(ItemEvent e) {


                if (e.getStateChange() == ItemEvent.SELECTED) {
                    JOptionPane.showMessageDialog(null,"Alert check SELECTED :"+e.getStateChange());

                }
                if (e.getStateChange() == ItemEvent.DESELECTED){
                    JOptionPane.showMessageDialog(null,"Alert check DESELECTED :"+e.getStateChange());


                }
            }
        }

ODDLY my JOptionPane gets called TWICE everytime I "Check" the box! Both SELECTED and DESELECTED. SO value remains the same!

Upvotes: 0

Views: 371

Answers (2)

alex2410
alex2410

Reputation: 10994

You need to use ItemListener as recommended, also use next trick with SwingUtilities.invokeLater(), and your JOptionPane will be called only once:

ItemListener listener4 = new ItemListener() {
        @Override
        public void itemStateChanged(final ItemEvent e) {
            SwingUtilities.invokeLater(new Runnable() {
                @Override
                public void run() {
                    if (e.getStateChange() == ItemEvent.SELECTED) {
                        JOptionPane.showMessageDialog(null,"Alert check SELECTED :"+ e.getStateChange());
                    } else if (e.getStateChange() == ItemEvent.DESELECTED) {
                        JOptionPane.showMessageDialog(null,"Alert check DESELECTED :"+ e.getStateChange());
                    }
                }
            });

        }
    };

seems it was a bug

Upvotes: 1

hankd
hankd

Reputation: 649

I think you need an ItemListener, not a ChangeListener. See the example here: http://docs.oracle.com/javase/tutorial/uiswing/components/button.html

ItemListener listener4 = new ItemListener() {

        public void itemStateChanged(ItemEvent e) {

            if (e.getStateChange() == ItemEvent.SELECTED) {
                JOptionPane.showMessageDialog(null,"Alert check :"+e.getStateChange());
            }
        }
    };


    AlertAudible.addItemListener(listener4);

Upvotes: 0

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