How to capture keyEvent on parent when any child is focused?

Question

I have JDialog that contains many JTextFields and JLabels and jbutton. When any of these components(textfields or buttons) are focused and ESCAPE is typed I want to capture generated keyEvent in parent JDialog.

I know there is clear solution for this. I cannot find it on the net.

Thank you!

Please write some code so we can help you fast – Shoaib Chikate Nov 01 '13 at 13:29 — Shoaib Chikate, Nov 01 '13 at 13:29

score 2 · Answer 1 · answered Nov 01 '13 at 13:35

2

Read more about key bindings. Try next code it can help you:

public static void main(String[] args) {

    JFrame f = new JFrame();
    JTextField field =new JTextField();
    f.getContentPane().add(field,BorderLayout.SOUTH);

    ((JPanel)f.getContentPane()).getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(KeyStroke.getKeyStroke("F2"), "doSomething");
    ((JPanel)f.getContentPane()).getActionMap ().put("doSomething", new AbstractAction() {

        @Override
        public void actionPerformed(ActionEvent arg0) {
            System.out.println("test");
        }
    });
    f.getContentPane().add(new JLabel("1"),BorderLayout.NORTH);


    f.pack();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
}

Use next construction getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT) because of: The component contains (or is) the component that has the focus. This input map is commonly used for a composite component — a component whose implementation depends on child components.(according to docs)

answered Nov 01 '13 at 13:35

alex2410

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Yes, this is right. But how to create KeyStroke for Escape. Because I see there only for F2. – Volodymyr Levytskyi Nov 01 '13 at 13:38
change F2 with ESCAPE, and it will be work! – alex2410 Nov 01 '13 at 13:41
((JPanel)super.getContentPane()).getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(KeyStroke.getKeyStroke("released ESCAPE"), "actionOnEscape"); – Volodymyr Levytskyi Nov 01 '13 at 13:43
you can write `KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE,0)` – alex2410 Nov 01 '13 at 13:45
What does 0 mean here? – Volodymyr Levytskyi Nov 01 '13 at 13:49
it's empty as i know, I forgot constant name((. But you also can use "released ESCAPE" – alex2410 Nov 01 '13 at 13:51
`What does 0 mean here?` - did you read the API description for the method? – camickr Nov 01 '13 at 14:50
0 means no modifiers which is no key like SHIFT, CTRL, ALT and etc are pressed with the given key stroke. – chAmi Jun 16 '16 at 10:56

How to capture keyEvent on parent when any child is focused?

1 Answers1