Swing.md

Working with Swing

JNativeHook does NOT operate on the event dispatch thread. Because Swing components are not thread safe, you MUST wrap access to Swing components using the SwingUtilities.invokeLater() or EventQueue.invokeLater() methods. As of version 2.0, the SwingDispatchService class maybe used to automatically use Swing's event dispatch thread for all native event delivery.

import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import com.github.kwhat.jnativehook.GlobalScreen;
import com.github.kwhat.jnativehook.NativeHookException;
import com.github.kwhat.jnativehook.dispatcher.SwingDispatchService;
import com.github.kwhat.jnativehook.keyboard.NativeKeyEvent;
import com.github.kwhat.jnativehook.keyboard.NativeKeyListener;

public class SwingExample extends JFrame implements NativeKeyListener, WindowListener {
	public SwingExample() {
		// Set the event dispatcher to a swing safe executor service.
		GlobalScreen.setEventDispatcher(new SwingDispatchService());

		setTitle("JNativeHook Swing Example");
		setSize(300, 150);
		setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
		addWindowListener(this);
		setVisible(true);
	}

	public void windowOpened(WindowEvent e) {
		// Initialze native hook.
		try {
			GlobalScreen.registerNativeHook();
		}
		catch (NativeHookException ex) {
			System.err.println("There was a problem registering the native hook.");
			System.err.println(ex.getMessage());
			ex.printStackTrace();

			System.exit(1);
		}

		GlobalScreen.addNativeKeyListener(this);
	}

	public void windowClosed(WindowEvent e) {
		//Clean up the native hook.
		GlobalScreen.unregisterNativeHook();
		System.runFinalization();
		System.exit(0);
	}

	public void windowClosing(WindowEvent e) { /* Unimplemented */ }
	public void windowIconified(WindowEvent e) { /* Unimplemented */ }
	public void windowDeiconified(WindowEvent e) { /* Unimplemented */ }
	public void windowActivated(WindowEvent e) { /* Unimplemented */ }
	public void windowDeactivated(WindowEvent e) { /* Unimplemented */ }

	public void nativeKeyReleased(NativeKeyEvent e) {
		if (e.getKeyCode() == NativeKeyEvent.VC_SPACE) {
			JOptionPane.showMessageDialog(null, "This will run on Swing's Event Dispatch Thread.");
		}
	}

	public void nativeKeyPressed(NativeKeyEvent e) { /* Unimplemented */ }
	public void nativeKeyTyped(NativeKeyEvent e) { /* Unimplemented */ }

	public static void main(String[] args) {
		 SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				new SwingExample();
			}
		});
	}
}