java-org.hwo.ui/src/org/hwo/ui/KeyStrokeHelper.java

package org.hwo.ui;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.KeyStroke;

public class KeyStrokeHelper {
	
	private class KeyStrokeActionListener implements ActionListener
	{
		int keycode;
		
		public KeyStrokeActionListener(int keycode)
		{
			this.keycode = keycode;
		}
		
		@Override
		public void actionPerformed(ActionEvent e) {
			fireKeyStroke(keycode);
		}
		
	}
	
	ArrayList<KeyStrokeListener> keystrokeListeners;
	JComponent component;
	JFrame frame;
	private boolean focusedWindow;
	
	public KeyStrokeHelper(JComponent component)
	{
		keystrokeListeners = new ArrayList<KeyStrokeListener>();
		this.component = component;
		focusedWindow = false;
	}

	public KeyStrokeHelper(JFrame frame)
	{
		keystrokeListeners = new ArrayList<KeyStrokeListener>();
		this.frame = frame;
		this.component = frame.getRootPane();
		this.focusedWindow = true;
	}
	
	public KeyStrokeHelper addKeyCode(int keyCode)
	{
		int focused;
		
		if (focusedWindow)
			focused = JComponent.WHEN_IN_FOCUSED_WINDOW;
		else
			focused = JComponent.WHEN_FOCUSED;
		component.registerKeyboardAction(new KeyStrokeActionListener(keyCode), KeyStroke.getKeyStroke(keyCode, 0), focused);
		return this;
	}
	
	public void removeKey(int keyCode)
	{
		if (focusedWindow)
			frame.getRootPane().unregisterKeyboardAction(KeyStroke.getKeyStroke(keyCode, 0));
		else
			component.unregisterKeyboardAction(KeyStroke.getKeyStroke(keyCode, 0));
	}
	
	public void registerKeyStrokeListener(KeyStrokeListener listener)
	{
		keystrokeListeners.add(listener);
	}
	
	public void removeKeyStrokeListener(KeyStrokeListener listener)
	{
		keystrokeListeners.remove(listener);
	}
	
	
	private void fireKeyStroke(int keyCode)
	{
		for (KeyStrokeListener listener:keystrokeListeners)
			listener.keyStroke(new KeyStrokeParameters(keyCode));		
	}

	public boolean isFocusedWindow() {
		return focusedWindow;
	}

	public void setFocusedWindow(boolean focusedWindow) {
		this.focusedWindow = focusedWindow;
	}
	
}