project_files/Android-build/SDL-android-project/src/org/hedgewars/hedgeroid/util/TickHandler.java
author koda
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/*
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 * Hedgewars for Android. An Android port of Hedgewars, a free turn based strategy game
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 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
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 * of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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 */
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package org.hedgewars.hedgeroid.util;
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import android.os.Handler;
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import android.os.Looper;
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import android.os.Message;
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/**
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 * This class handles regularly calling a specified runnable
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 * on the looper provided in the constructor. The first call
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 * occurs without delay (though still via the looper), all
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 * following calls are delayed by (approximately) the interval.
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 * The interval can be changed at any time, which will cause
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 * an immediate execution of the runnable again.
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 */
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public class TickHandler extends Handler {
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    private final Runnable callback;
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    private int messageId;
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    private long interval;
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    private boolean running;
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    public TickHandler(Looper looper, long interval, Runnable callback) {
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        super(looper);
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        this.callback = callback;
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        this.interval = interval;
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    }
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    public synchronized void stop() {
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        messageId++;
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        running = false;
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    }
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    public synchronized void start() {
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        messageId++;
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        sendMessage(obtainMessage(messageId));
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        running = true;
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    }
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    public synchronized void setInterval(long interval) {
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        this.interval = interval;
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        if(running) {
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            start();
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        }
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    }
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    @Override
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    public synchronized void handleMessage(Message msg) {
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        if(msg.what == messageId) {
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            callback.run();
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        }
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        if(msg.what == messageId) {
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            sendMessageDelayed(obtainMessage(messageId), interval);
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        }
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    }
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}