How to Efficiently Handle Keyboard and Mouse Events in Java's Full-Screen Exclusive Mode?

Handling Keyboard and Mouse Events in Full Screen Exclusive Mode with Java

In passive rendering mode, events from the user can be handled using KeyListener and ActionListener interfaces. However, when using full screen mode, a different approach is necessary.

To handle events in full screen mode while ensuring efficient rendering, you can implement the following steps:

FullScreenTest Example

Consider the following FullScreenTest class, which provides an example of how to handle events in full screen mode:

public class FullScreenTest extends JPanel {

    // Set up a JFrame for full screen exclusive mode
    private JFrame f = new JFrame("FullScreenTest");

    // Initialize an exit action and add it to the JFrame's root pane
    private Action exit = new AbstractAction(EXIT) {
        @Override
        public void actionPerformed(ActionEvent e) {
            // Close the JFrame when the exit action is triggered
            f.dispatchEvent(new WindowEvent(f, WindowEvent.WINDOW_CLOSING));
        }
    };

    private JButton b = new JButton(exit);
    
    // Create a FullScreenTest instance and add it to the JFrame
    public FullScreenTest() {
        // Add a button to the JPanel and set it as the default button for the JFrame
        this.add(b);
        f.getRootPane().setDefaultButton(b);
    
        // Register a KeyStroke for the exit action (in this case, the 'Q' key)
        this.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_Q, 0), EXIT);
    
        // Associate the exit action with the EXIT key
        this.getActionMap().put(EXIT, exit);
        
        // Add a MouseAdapter to handle mouse movement and display tooltips
        this.addMouseMotionListener(new MouseAdapter() {
            @Override
            public void mouseMoved(MouseEvent e) {
                FullScreenTest.this.setToolTipText(
                    "("+ e.getX() + "," + e.getY() + ")");
            }
        });
    }
    
    // Display the JFrame in full screen exclusive mode
    private void display() {
        GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice dev = env.getDefaultScreenDevice();
        
        // Configure the JFrame for full screen mode
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setBackground(Color.darkGray);
        f.setResizable(false);
        f.setUndecorated(true);
        f.add(this);
        f.pack();
        
        // Set the JFrame to be the full screen window
        dev.setFullScreenWindow(f);
    }
    
   // Create a main method and run the application in the EventQueue
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
        @Override
        public void run() {
            new FullScreenTest().display();
            }
        });
    }
}

In this example:

• We create a JFrame and set it up for full screen exclusive mode.
• We use KeyListener and an InputMap to handle key events in the full screen mode.
• We use MouseListener and a MouseAdapter to handle mouse movement and display tooltips in the full screen mode.
• We use the default button features of the JFrame to provide an easy way for the user to exit the full screen mode.

By using this approach, you can handle keyboard and mouse events efficiently in full screen mode while maintaining optimal performance for your graphics rendering.

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