1 /*

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

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

     4  *

     5  * This program is free software; you can redistribute it and/or

     6  * modify it under the terms of the GNU General Public License

     7  * as published by the Free Software Foundation; either version 2

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

     9  *

    10  * This program is distributed in the hope that it will be useful,

    11  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    13  * GNU General Public License for more details.

    14  *

    15  * You should have received a copy of the GNU General Public License

    16  * along with this program; if not, write to the Free Software

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

    18  */

    19 

    20 package org.hedgewars.hedgeroid.util;

    21 

    22 import android.os.Handler;

    23 import android.os.Looper;

    24 import android.os.Message;

    25 

    26 /**

    27  * This class handles regularly calling a specified runnable

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

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

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

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

    32  * an immediate execution of the runnable again.

    33  */

    34 public class TickHandler extends Handler {

    35 	private final Runnable callback;

    36 	private int messageId;

    37 	private long interval;

    38 	private boolean running;

    39 	

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

    41 		super(looper);

    42 		this.callback = callback;

    43 		this.interval = interval;

    44 	}

    45 	

    46 	public synchronized void stop() {

    47 		messageId++;

    48 		running = false;

    49 	}

    50 	

    51 	public synchronized void start() {

    52 		messageId++;

    53 		sendMessage(obtainMessage(messageId));

    54 		running = true;

    55 	}

    56 	

    57 	public synchronized void setInterval(long interval) {

    58 		this.interval = interval;

    59 		if(running) {

    60 			start();

    61 		}

    62 	}

    63 	

    64 	@Override

    65 	public synchronized void handleMessage(Message msg) {

    66 		if(msg.what == messageId) {

    67 			callback.run();

    68 		}

    69 		if(msg.what == messageId) {

    70 			sendMessageDelayed(obtainMessage(messageId), interval);

    71 		}

    72 	}

    73 }