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comparison: dom/battery/BatteryManager.cpp
dom/battery/BatteryManager.cpp
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include <limits> | |
| 7 #include "BatteryManager.h" | |
| 8 #include "Constants.h" | |
| 9 #include "mozilla/DOMEventTargetHelper.h" | |
| 10 #include "mozilla/Hal.h" | |
| 11 #include "mozilla/Preferences.h" | |
| 12 #include "mozilla/dom/BatteryManagerBinding.h" | |
| 13 #include "nsIDOMClassInfo.h" | |
| 14 | |
| 15 /** | |
| 16 * We have to use macros here because our leak analysis tool things we are | |
| 17 * leaking strings when we have |static const nsString|. Sad :( | |
| 18 */ | |
| 19 #define LEVELCHANGE_EVENT_NAME NS_LITERAL_STRING("levelchange") | |
| 20 #define CHARGINGCHANGE_EVENT_NAME NS_LITERAL_STRING("chargingchange") | |
| 21 #define DISCHARGINGTIMECHANGE_EVENT_NAME NS_LITERAL_STRING("dischargingtimechange") | |
| 22 #define CHARGINGTIMECHANGE_EVENT_NAME NS_LITERAL_STRING("chargingtimechange") | |
| 23 | |
| 24 namespace mozilla { | |
| 25 namespace dom { | |
| 26 namespace battery { | |
| 27 | |
| 28 BatteryManager::BatteryManager(nsPIDOMWindow* aWindow) | |
| 29 : DOMEventTargetHelper(aWindow) | |
| 30 , mLevel(kDefaultLevel) | |
| 31 , mCharging(kDefaultCharging) | |
| 32 , mRemainingTime(kDefaultRemainingTime) | |
| 33 { | |
| 34 } | |
| 35 | |
| 36 void | |
| 37 BatteryManager::Init() | |
| 38 { | |
| 39 hal::RegisterBatteryObserver(this); | |
| 40 | |
| 41 hal::BatteryInformation batteryInfo; | |
| 42 hal::GetCurrentBatteryInformation(&batteryInfo); | |
| 43 | |
| 44 UpdateFromBatteryInfo(batteryInfo); | |
| 45 } | |
| 46 | |
| 47 void | |
| 48 BatteryManager::Shutdown() | |
| 49 { | |
| 50 hal::UnregisterBatteryObserver(this); | |
| 51 } | |
| 52 | |
| 53 JSObject* | |
| 54 BatteryManager::WrapObject(JSContext* aCx) | |
| 55 { | |
| 56 return BatteryManagerBinding::Wrap(aCx, this); | |
| 57 } | |
| 58 | |
| 59 double | |
| 60 BatteryManager::DischargingTime() const | |
| 61 { | |
| 62 if (mCharging || mRemainingTime == kUnknownRemainingTime) { | |
| 63 return std::numeric_limits<double>::infinity(); | |
| 64 } | |
| 65 | |
| 66 return mRemainingTime; | |
| 67 } | |
| 68 | |
| 69 double | |
| 70 BatteryManager::ChargingTime() const | |
| 71 { | |
| 72 if (!mCharging || mRemainingTime == kUnknownRemainingTime) { | |
| 73 return std::numeric_limits<double>::infinity(); | |
| 74 } | |
| 75 | |
| 76 return mRemainingTime; | |
| 77 } | |
| 78 | |
| 79 void | |
| 80 BatteryManager::UpdateFromBatteryInfo(const hal::BatteryInformation& aBatteryInfo) | |
| 81 { | |
| 82 mLevel = aBatteryInfo.level(); | |
| 83 mCharging = aBatteryInfo.charging(); | |
| 84 mRemainingTime = aBatteryInfo.remainingTime(); | |
| 85 | |
| 86 // Add some guards to make sure the values are coherent. | |
| 87 if (mLevel == 1.0 && mCharging == true && | |
| 88 mRemainingTime != kDefaultRemainingTime) { | |
| 89 mRemainingTime = kDefaultRemainingTime; | |
| 90 NS_ERROR("Battery API: When charging and level at 1.0, remaining time " | |
| 91 "should be 0. Please fix your backend!"); | |
| 92 } | |
| 93 } | |
| 94 | |
| 95 void | |
| 96 BatteryManager::Notify(const hal::BatteryInformation& aBatteryInfo) | |
| 97 { | |
| 98 double previousLevel = mLevel; | |
| 99 bool previousCharging = mCharging; | |
| 100 double previousRemainingTime = mRemainingTime; | |
| 101 | |
| 102 UpdateFromBatteryInfo(aBatteryInfo); | |
| 103 | |
| 104 if (previousCharging != mCharging) { | |
| 105 DispatchTrustedEvent(CHARGINGCHANGE_EVENT_NAME); | |
| 106 } | |
| 107 | |
| 108 if (previousLevel != mLevel) { | |
| 109 DispatchTrustedEvent(LEVELCHANGE_EVENT_NAME); | |
| 110 } | |
| 111 | |
| 112 /* | |
| 113 * There are a few situations that could happen here: | |
| 114 * 1. Charging state changed: | |
| 115 * a. Previous remaining time wasn't unkwonw, we have to fire an event for | |
| 116 * the change. | |
| 117 * b. New remaining time isn't unkwonw, we have to fire an event for it. | |
| 118 * 2. Charging state didn't change but remainingTime did, we have to fire | |
| 119 * the event that correspond to the current charging state. | |
| 120 */ | |
| 121 if (mCharging != previousCharging) { | |
| 122 if (previousRemainingTime != kUnknownRemainingTime) { | |
| 123 DispatchTrustedEvent(previousCharging ? CHARGINGTIMECHANGE_EVENT_NAME | |
| 124 : DISCHARGINGTIMECHANGE_EVENT_NAME); | |
| 125 } | |
| 126 if (mRemainingTime != kUnknownRemainingTime) { | |
| 127 DispatchTrustedEvent(mCharging ? CHARGINGTIMECHANGE_EVENT_NAME | |
| 128 : DISCHARGINGTIMECHANGE_EVENT_NAME); | |
| 129 } | |
| 130 } else if (previousRemainingTime != mRemainingTime) { | |
| 131 DispatchTrustedEvent(mCharging ? CHARGINGTIMECHANGE_EVENT_NAME | |
| 132 : DISCHARGINGTIMECHANGE_EVENT_NAME); | |
| 133 } | |
| 134 } | |
| 135 | |
| 136 /* static */ bool | |
| 137 BatteryManager::HasSupport() | |
| 138 { | |
| 139 return Preferences::GetBool("dom.battery.enabled", true); | |
| 140 } | |
| 141 | |
| 142 } // namespace battery | |
| 143 } // namespace dom | |
| 144 } // namespace mozilla |
