How to have Command-W close a window on Mac OS in Java or Clojure

Question

I'd like to have ⌘ + W close a window/JFrame in a program I am writing in Clojure. How might this be accomplished? Pure Java solutions are also welcome.

Answer 1

Here's one way:

 Action closeWindow = new AbstractAction("Close Window") {
   @Override public void actionPerformed(ActionEvent e) {
     // window closing code here
   }
 };
 closeWindow.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke(
     KeyEvent.VK_W, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));

Put that Action in a menu on your menubar. The accelerator will be Ctrl + W on Windows.

Probably better would be to use the Keybinding API to have the main panel in each JFrame (assuming there are multiple) bind the same KeyStroke as above in its (WHEN_FOCUSED) input map to an action in its action map that closes the frame.

public class ClosableWindow extends JFrame {
  public void setUp() {
    JPanel mainPanel = createMainPanel();

    int mask = Toolkit.getDefaultToolkit().getMenuShortcutKeyMask();
    KeyStroke closeKey = KeyStroke.getKeyStroke(KeyEvent.VK_W, mask);

    mainPanel.getInputMap().put(closeKey, "closeWindow");        

    mainPanel.getActionMap().put("closeWindow", 
        new AbstractAction("Close Window") {
          @Override public void actionPerformed(ActionEvent e) {
            setVisible(false);
            dispose();
          }
        });

    getContentPane().add(mainPanel);      
  }
}