/* 
 
Copyright 2006 Rene Grothmann, modified by Eric Hakenholz

This file is part of C.a.R. software.

    C.a.R. is a free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, version 3 of the License.

    C.a.R. is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 */
 
 
 package rene.zirkel;

import java.awt.event.MouseEvent;

/**
 * @author Rene A thread for reporting drags to the main program, avoiding to
 *         many drag messages, so that the program seems to hang.
 */
class DragThread extends Thread {
	MouseEvent EWaiting = null;
	ZirkelCanvas ZC;
	Object Ready = new Object();
	boolean Working = false;

	public DragThread(final ZirkelCanvas zc) {
		ZC = zc;
		start();
	}

	@Override
	public void run() {
		MouseEvent e;
		while (true) {
			if (EWaiting == null) {
				try {
					synchronized (this) {
						wait();
					}
				} catch (final Exception ex) {
				}
			}
			if (EWaiting != null) {
				synchronized (this) {
					e = EWaiting;
					EWaiting = null;
				}
				Working = true;
				ZC.doMouseDragged(e);
				try {
					sleep(0);
				} catch (final Exception ex) {
				}
				Working = false;
				synchronized (Ready) {
					Ready.notify();
				}
			}
		}
	}

	public synchronized void mouseDragged(final MouseEvent e) {
		EWaiting = e;
		notify();
	}

	public void waitReady() {
		if (!Working)
			return;
		synchronized (Ready) {
			try {
				Thread.currentThread().wait(1000);
			} catch (final Exception ex) {
			}
		}
	}
}