FullScreen Swing Components Fail to Receive Keyboard Input on Java 7 on Mac OS X Mountain Lion

Question

Update 12/21:

7u10 was recently released. Confirmed that:

1. The issue still persists
2. Thankfully, the workaround still function

Answer 1

Instead, use key bindings, as shown in this FullScreenTest. Also, consider a DocumentListener, shown here, for text components.

Answer 2

This is because the component to which you added the other has now lost focus, you can fix this by either:

• calling requestFocus() on the component instance to which you add KeyBindings

or

• alternatively use JComponent.WHEN_IN_FOCUSED_WINDOW with KeyBindings:

  component.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(KeyEvent.VK_Q, 0),
                          "doSomething");
  component.getActionMap().put("doSomething",
                           anAction);
  

Reference:

• How to Use Key Bindings

Answer 3

I think I finally found a solution, registering click listeners against to the JFrame itself. (This is a class which extends JFrame, hence all the "this" references.)

/**
 * Toggles full screen mode. Requires a lot of references to the JFrame.
 */
public void setFullScreen(boolean fullScreen){
    GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice dev = env.getDefaultScreenDevice();//Gets the main screen
    if(!fullScreen){//Checks if a full screen application isn't open
        this.dispose();//Restarts the JFrame
        this.setVisible(false);
        this.setResizable(true);//Re-enables resize-ability.
        this.setUndecorated(false);//Adds title bar back
        this.setVisible(true);//Shows restarted JFrame
        this.removeMouseListener(macWorkAround);
        this.pack();
        this.setExtendedState(this.getExtendedState()|JFrame.MAXIMIZED_BOTH);//Returns to maximized state
        this.fullScreen = false;
    }
    else{
        this.dispose();//Restarts the JFrame
        this.setResizable(false);//Disables resizing else causes bugs
        this.setUndecorated(true);//removes title bar
        this.setVisible(true);//Makes it visible again
        this.revalidate();
        this.setSize(Toolkit.getDefaultToolkit().getScreenSize());
        try{
            dev.setFullScreenWindow(this);//Makes it full screen
            if(System.getProperty("os.name").indexOf("Mac OS X") >= 0){
                this.setVisible(false);
                this.setVisible(true);
                this.addMouseListener(macWorkAround);
            }
            this.repaint();
            this.revalidate();
        }
        catch(Exception e){
            dev.setFullScreenWindow(null);//Fall back behavior
        }
        this.requestFocus();
        this.fullScreen = true;
    }
}

private MouseAdapter macWorkAround = new MouseAdapter(){
    public void mouseClicked(MouseEvent e){
        MainGUI.this.setVisible(false);
        MainGUI.this.setVisible(true);
    }
};