WaitCursorEventQueue.java

package org.ripple.power.ui.view;

import java.awt.AWTEvent;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.EventQueue;
import java.awt.MenuComponent;
import java.awt.MenuContainer;

import javax.swing.SwingUtilities;

public class WaitCursorEventQueue extends EventQueue {

	public WaitCursorEventQueue(int delay) {
		this.delay = delay;
		waitTimer = new WaitCursorTimer();
		waitTimer.setDaemon(true);
		waitTimer.start();
	}

	protected void dispatchEvent(AWTEvent event) {
		waitTimer.startTimer(event.getSource());
		try {
			super.dispatchEvent(event);
		} finally {
			waitTimer.stopTimer();
		}
	}

	private int delay;

	private WaitCursorTimer waitTimer;

	private class WaitCursorTimer extends Thread {

		private Object source;
		private Component parent;
		
		synchronized void startTimer(Object source) {
			this.source = source;

			notify();
		}

		synchronized void stopTimer() {
			if (parent == null) {
				interrupt();
			} else {
				parent.setCursor(null);

				parent = null;
			}
		}

		public synchronized void run() {
			while (true) {
				try {
					wait();
					wait(delay);
					if (source instanceof Component) {
						parent = SwingUtilities.getRoot((Component) source);
					} else if (source instanceof MenuComponent) {
						MenuContainer mParent = ((MenuComponent) source)
								.getParent();
						if (mParent instanceof Component) {
							parent = SwingUtilities
									.getRoot((Component) mParent);
						}
					}
					if ((parent != null) && parent.isShowing()) {
						parent.setCursor(Cursor
								.getPredefinedCursor(Cursor.WAIT_CURSOR));
					}
				} catch (InterruptedException ie) {
				}
			}
		}

	}
}