/*

 * Hedgewars for Android. An Android port of Hedgewars, a free turn based strategy game

 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>

 *

 * This program is 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; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program 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, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 */

package org.hedgewars.hedgeroid.util;

import android.os.Handler;

import android.os.Looper;

import android.os.Message;

/**

 * This class handles regularly calling a specified runnable

 * on the looper provided in the constructor. The first call

 * occurs without delay (though still via the looper), all

 * following calls are delayed by (approximately) the interval.

 * The interval can be changed at any time, which will cause

 * an immediate execution of the runnable again.

 */

public class TickHandler extends Handler {

	private final Runnable callback;

	private int messageId;

	private long interval;

	private boolean running;

	public TickHandler(Looper looper, long interval, Runnable callback) {

		super(looper);

		this.callback = callback;

		this.interval = interval;

	}

	public synchronized void stop() {

		messageId++;

		running = false;

	}

	public synchronized void start() {

		messageId++;

		sendMessage(obtainMessage(messageId));

		running = true;

	}

	public synchronized void setInterval(long interval) {

		this.interval = interval;

		if(running) {

			start();

		}

	}

	@Override

	public synchronized void handleMessage(Message msg) {

		if(msg.what == messageId) {

			callback.run();

		}

		if(msg.what == messageId) {

			sendMessageDelayed(obtainMessage(messageId), interval);

		}

	}

}