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Java Discussion Thread
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Views: 5691

Sep 6th, 2005

0

Is there a JOptionPane Listener?

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Hi all,

I have a JOptionPane with a YES button and a NO button. All I want to do is be able to press the left or right button on the keyboard to change the focus on the buttons. By using the mouse it works. Is there some kind of Listener I can use?

Here is my code :

====================================================

int response = JOptionPane.showConfirmDialog(null,"Are you sure you want to exit","Exit?",

JOptionPane.YES_NO_OPTION,JOptionPane.PLAIN_MESSAGE);

if(response == JOptionPane.YES_OPTION){
System.exit(1);
}else {
//do nothing
}

=====================================================

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Newbie Poster

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12 posts
since Nov 2004

Sep 6th, 2005

0

Re: Is there a JOptionPane Listener?

You could TRY a keylistener but I'm not sure that'll work out exactly like you want. There should already be a mechanism built in that changes components when tab is pressed. I would stick to that if I were you.

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Postaholic

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2,108 posts
since Jun 2004

Sep 7th, 2005

0

Re: Is there a JOptionPane Listener?

From Windows, usually hitting TAB will change focus between components. If you must use the arrow keys, you could add a KeyListener which changes the focus to the button components. I would probably make a new class and extend the JOptionPane

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Practically a Posting Shark

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856 posts
since Mar 2004

Jun 7th, 2010

0

Re: Is there a JOptionPane Listener?

Copy and paste the code below to your Main class.
So call configureOptionPane() at your main method.
Also use UIManager.put("Button.defaultButtonFollowsFocus", Boolean.TRUE) to make enter follows focus.
Example:

Java Syntax (Toggle Plain Text)
public static void main(String[] args) {
   UIManager.put("Button.defaultButtonFollowsFocus", Boolean.TRUE);
   configureOptionPane();
}
public static void main(String[] args) {
   UIManager.put("Button.defaultButtonFollowsFocus", Boolean.TRUE);
   configureOptionPane();
}

Java Syntax (Toggle Plain Text)
private static void configureOptionPane() {
        if(UIManager.getLookAndFeelDefaults().get("OptionPane.actionMap") == null)
        {
            UIManager.put("OptionPane.windowBindings", new 
            Object[] {
                        "ESCAPE", "close",
                        "LEFT", "left",
                        "KP_LEFT", "left",
                        "RIGHT", "right",
                        "KP_RIGHT", "right"
                    });
                    ActionMap map = new ActionMapUIResource();
                    map.put("close", new OptionPaneCloseAction());
                    map.put("left", new OptionPaneArrowAction(false));
                    map.put("right", new OptionPaneArrowAction(true));
                    UIManager.getLookAndFeelDefaults().put
            ("OptionPane.actionMap", map);
        }
    }
 
    private static class OptionPaneCloseAction extends AbstractAction {
        public void actionPerformed(ActionEvent e) {
            JOptionPane optionPane = (JOptionPane) e.getSource();
            optionPane.setValue(JOptionPane.CLOSED_OPTION);
        }
    }
 
    private static class OptionPaneArrowAction extends AbstractAction {
        private boolean myMoveRight;
        OptionPaneArrowAction(boolean moveRight) {
            myMoveRight = moveRight;
        }
        public void actionPerformed(ActionEvent e) {
            JOptionPane optionPane = (JOptionPane) e.getSource();
            EventQueue eq = Toolkit.getDefaultToolkit().getSystemEventQueue();
 
            eq.postEvent(new KeyEvent(
                    optionPane,
                    KeyEvent.KEY_PRESSED,
                    e.getWhen(),
                    (myMoveRight) ? 0 : InputEvent.SHIFT_DOWN_MASK,
                    KeyEvent.VK_TAB,
                    KeyEvent.CHAR_UNDEFINED,
                    KeyEvent.KEY_LOCATION_UNKNOWN
            ));
        }
    }
private static void configureOptionPane() {
        if(UIManager.getLookAndFeelDefaults().get("OptionPane.actionMap") == null)
        {
            UIManager.put("OptionPane.windowBindings", new 
            Object[] {
                        "ESCAPE", "close",
                        "LEFT", "left",
                        "KP_LEFT", "left",
                        "RIGHT", "right",
                        "KP_RIGHT", "right"
                    });
                    ActionMap map = new ActionMapUIResource();
                    map.put("close", new OptionPaneCloseAction());
                    map.put("left", new OptionPaneArrowAction(false));
                    map.put("right", new OptionPaneArrowAction(true));
                    UIManager.getLookAndFeelDefaults().put
            ("OptionPane.actionMap", map);
        }
    }

    private static class OptionPaneCloseAction extends AbstractAction {
        public void actionPerformed(ActionEvent e) {
            JOptionPane optionPane = (JOptionPane) e.getSource();
            optionPane.setValue(JOptionPane.CLOSED_OPTION);
        }
    }

    private static class OptionPaneArrowAction extends AbstractAction {
        private boolean myMoveRight;
        OptionPaneArrowAction(boolean moveRight) {
            myMoveRight = moveRight;
        }
        public void actionPerformed(ActionEvent e) {
            JOptionPane optionPane = (JOptionPane) e.getSource();
            EventQueue eq = Toolkit.getDefaultToolkit().getSystemEventQueue();
            
            eq.postEvent(new KeyEvent(
                    optionPane,
                    KeyEvent.KEY_PRESSED,
                    e.getWhen(),
                    (myMoveRight) ? 0 : InputEvent.SHIFT_DOWN_MASK,
                    KeyEvent.VK_TAB,
                    KeyEvent.CHAR_UNDEFINED,
                    KeyEvent.KEY_LOCATION_UNKNOWN
            ));
        }
    }

Last edited by viniciusmss; Jun 7th, 2010 at 11:20 am.

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