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

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

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

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

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

    32  * information change.

    33  */

    34 public final class CalmDownHandler extends Handler {

    35 	int runningMessagesCounter = 0;

    36 	final Runnable inactivityRunnable;

    37 	final long inactivityMs;

    38 	boolean stopped;

    39 

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

    41 		super(looper);

    42 		this.inactivityRunnable = runnable;

    43 		this.inactivityMs = inactivityMs;

    44 	}

    45 	

    46 	public void activity() {

    47 		runningMessagesCounter++;

    48 		sendMessageDelayed(obtainMessage(), inactivityMs);

    49 	}

    50 	

    51 	@Override

    52 	public void handleMessage(Message msg) {

    53 		runningMessagesCounter--;

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

    55 			inactivityRunnable.run();

    56 		}

    57 	}

    58 	

    59 	public void stop() {

    60 		stopped = true;

    61 	}

    62 }