Question

So I am trying to prevent the user from being able to use the default system actions by pressing control + C, control + X, control + V.

I want anywhere inside this particular scrollPane, to catch the key. The scrollPane loads a Component into itself, for example JLabel.

scrollPane.addKeyListener(new KeyListener(){
    @Override
    public void keyPressed(KeyEvent evt) {
        if (evt.isControlDown() && evt.getKeyCode() == KeyEvent.VK_C) {
                System.out.println("disabled");
        } else if (evt.isControlDown() && evt.getKeyCode() == KeyEvent.VK_X) {
               System.out.println("disabled");
        } else if (evt.isControlDown() && evt.getKeyCode() == KeyEvent.VK_V) {
               System.out.println("disabled");
        }
    }

    @Override
    public void keyReleased(KeyEvent arg0) {
        // TODO Auto-generated method stub
    }

    @Override
    public void keyTyped(KeyEvent arg0) {
        // TODO Auto-generated method stub
    }
});

However, nothing is being printed.

I added the same keylistener to a Jtree but it’s working for that.

UPDATE:

So using keybinds, how do I get a JoptionPane to appear?

  scrollPane.getInputMap(JComponent.WHEN_FOCUSED)
                        .put(KeyStroke.getKeyStroke(KeyEvent.VK_C, KeyEvent.CTRL_DOWN_MASK), 
                                JOptionPane.showMessageDialog(null, "disabled"));

Answer 1

better would be implements KeyBindings rather than KeyListener, because

1) KeyListener works only when JComponent has Focus in the Window,

2) you set KeyListener to JScrollPane instead of JTree

3) for KeyBindings you can set InputMap and ActionMap for

• to the TopLevel Container (JFrame, JDialog, JWindow)

• concrete JComponent(s)

4) for KeyListener and KeyBindings this TopLevel Container must have Focus on the Screen

5) then you can set for required event(s)#consume();