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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.cyanogenmod.trebuchet;
import android.os.Handler;
public class Alarm implements Runnable{
// if we reach this time and the alarm hasn't been cancelled, call the listener
private long mAlarmTriggerTime;
// if we've scheduled a call to run() (ie called mHandler.postDelayed), this variable is true.
// We use this to avoid having multiple pending callbacks
private boolean mWaitingForCallback;
private Handler mHandler;
private OnAlarmListener mAlarmListener;
private boolean mAlarmPending = false;
public Alarm() {
mHandler = new Handler();
}
public void setOnAlarmListener(OnAlarmListener alarmListener) {
mAlarmListener = alarmListener;
}
// Sets the alarm to go off in a certain number of milliseconds. If the alarm is already set,
// it's overwritten and only the new alarm setting is used
public void setAlarm(long millisecondsInFuture) {
long currentTime = System.currentTimeMillis();
mAlarmPending = true;
mAlarmTriggerTime = currentTime + millisecondsInFuture;
if (!mWaitingForCallback) {
mHandler.postDelayed(this, mAlarmTriggerTime - currentTime);
mWaitingForCallback = true;
}
}
public void cancelAlarm() {
mAlarmTriggerTime = 0;
mAlarmPending = false;
}
// this is called when our timer runs out
public void run() {
mWaitingForCallback = false;
if (mAlarmTriggerTime != 0) {
long currentTime = System.currentTimeMillis();
if (mAlarmTriggerTime > currentTime) {
// We still need to wait some time to trigger spring loaded mode--
// post a new callback
mHandler.postDelayed(this, Math.max(0, mAlarmTriggerTime - currentTime));
mWaitingForCallback = true;
} else {
mAlarmPending = false;
if (mAlarmListener != null) {
mAlarmListener.onAlarm(this);
}
}
}
}
public boolean alarmPending() {
return mAlarmPending;
}
}
interface OnAlarmListener {
public void onAlarm(Alarm alarm);
}
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