/*

 * 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 allows you to define a runnable that is called when there has been

 * no activity for a set amount of time, where activity is determined by calls

 * to the activity() method of the handler. It is used to update the map preview

 * when there have been no updates to the relevant map information for a time,

 * to prevent triggering several updates at once when different parts of the

 * information change.

 */

public final class CalmDownHandler extends Handler {

	int runningMessagesCounter = 0;

	final Runnable inactivityRunnable;

	final long inactivityMs;

	boolean stopped;

	public CalmDownHandler(Looper looper, Runnable runnable, long inactivityMs) {

		super(looper);

		this.inactivityRunnable = runnable;

		this.inactivityMs = inactivityMs;

	}

	public void activity() {

		runningMessagesCounter++;

		sendMessageDelayed(obtainMessage(), inactivityMs);

	}

	@Override

	public void handleMessage(Message msg) {

		runningMessagesCounter--;

		if(runningMessagesCounter==0 && !stopped) {

			inactivityRunnable.run();

		}

	}

	public void stop() {

		stopped = true;

	}

}