Adding keylistener to panel in CardLayout

Question

I'm writing a simple game, and I have main frame with 4 JPanels placed in CardLayout. Main frame looks like that:

private static JPanel[] panele = new JPanel[4];
private static JPanel panel;    
public GameWindow()
{
    super("Sokoban");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setLayout(new BorderLayout());
    panele[0] = new MainMenu();
    panele[1] = new LoadGameMenu();
    panele[2] = new SaveGameMenu();     
    panele[3] = new GameScene();        
    panel = new JPanel(new CardLayout());

    //((MainMenu)panele[0]).setSaveOptionState(false);
    panel.add(panele[0], "MainMenu");
    panel.add(panele[1], "LoadGameMenu");
    panel.add(panele[2], "SaveGameMenu");
    panel.add(panele[3], "GameScene");      
    add(panel, BorderLayout.CENTER);


}

The GameScene panel have react to keyboard input. First I tried keylistener:

public GameScene() {        
    setFocusable(true);
    initWorld(); //Drawing on JPanel takes place here       
    addKeyListener(new Keyboard());         
}
class Keyboard extends KeyAdapter
{
    private int key;
    public void keyPressed(KeyEvent event)
    {
        System.out.println("Tu jestem");
        key = event.getKeyCode();
        if(key == KeyEvent.VK_ESCAPE)
        {
            Game.gra = new GameWindow(MenuAction.MAIN_MENU);
            System.out.println("Escape");
        }

That wasn't working... so I tried keybinding (simple implementation):

public GameScene() {    

    setFocusable(true);
    initWorld();  //Drawing on JPanel takes place here      
   // requestFocus();
    setInputMap(WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, getInputMap());
    KeyStroke key = KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0);
    getInputMap().put(key, "pressed");      
    getActionMap().put("pressed", new AbstractAction(){         
        public void actionPerformed(ActionEvent arg0) {
            System.out.println("Spacja");
            //Game.gra = new GameWindow(MenuAction.MAIN_MENU);

        }

    });
}

It's still not working... I tried adding requestFocus and requestFocusInWindow() but with no effect. Any ideas how to fix it or to do it?

Solution have been found. In key binding I should write:

getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(key, "pressed");

insted of:

getInputMap().put(key, "pressed"); 

Answer 1

By using Action, illustrated here, you can bind a key (or combination) to that Action, as shown here. For additional guidance, please edit your question to include an sscce using either or both examples.