Michael Jurka | d3ef306 | 2010-11-23 16:23:58 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.launcher2; |
| 18 | |
| 19 | import android.os.Handler; |
| 20 | |
| 21 | public class Alarm implements Runnable{ |
| 22 | // if we reach this time and the alarm hasn't been cancelled, call the listener |
| 23 | private long mAlarmTriggerTime; |
| 24 | |
| 25 | // if we've scheduled a call to run() (ie called mHandler.postDelayed), this variable is true. |
| 26 | // We use this to avoid having multiple pending callbacks |
| 27 | private boolean mWaitingForCallback; |
| 28 | |
| 29 | private Handler mHandler; |
| 30 | private OnAlarmListener mAlarmListener; |
| 31 | |
| 32 | public Alarm() { |
| 33 | mHandler = new Handler(); |
| 34 | } |
| 35 | |
| 36 | public void setOnAlarmListener(OnAlarmListener alarmListener) { |
| 37 | mAlarmListener = alarmListener; |
| 38 | } |
| 39 | |
| 40 | // Sets the alarm to go off in a certain number of milliseconds. If the alarm is already set, |
| 41 | // it's overwritten and only the new alarm setting is used |
| 42 | public void setAlarm(long millisecondsInFuture) { |
| 43 | long currentTime = System.currentTimeMillis(); |
| 44 | mAlarmTriggerTime = currentTime + millisecondsInFuture; |
| 45 | if (!mWaitingForCallback) { |
| 46 | mHandler.postDelayed(this, mAlarmTriggerTime - currentTime); |
| 47 | mWaitingForCallback = true; |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | public void cancelAlarm() { |
| 52 | mAlarmTriggerTime = 0; |
| 53 | } |
| 54 | |
| 55 | // this is called when our timer runs out |
| 56 | public void run() { |
| 57 | mWaitingForCallback = false; |
| 58 | if (mAlarmTriggerTime != 0) { |
| 59 | long currentTime = System.currentTimeMillis(); |
| 60 | if (mAlarmTriggerTime > currentTime) { |
| 61 | // We still need to wait some time to trigger spring loaded mode-- |
| 62 | // post a new callback |
| 63 | mHandler.postDelayed(this, Math.max(0, mAlarmTriggerTime - currentTime)); |
| 64 | mWaitingForCallback = true; |
| 65 | } else { |
| 66 | if (mAlarmListener != null) { |
| 67 | mAlarmListener.onAlarm(this); |
| 68 | } |
| 69 | } |
| 70 | } |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | interface OnAlarmListener { |
| 75 | public void onAlarm(Alarm alarm); |
| 76 | } |