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-rw-r--r--dom/battery/BatteryManager.cpp212
1 files changed, 212 insertions, 0 deletions
diff --git a/dom/battery/BatteryManager.cpp b/dom/battery/BatteryManager.cpp
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+++ b/dom/battery/BatteryManager.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <cmath>
+#include <limits>
+#include "BatteryManager.h"
+#include "Constants.h"
+#include "mozilla/DOMEventTargetHelper.h"
+#include "mozilla/Hal.h"
+#include "mozilla/dom/BatteryManagerBinding.h"
+#include "mozilla/Preferences.h"
+#include "nsContentUtils.h"
+#include "nsIDOMClassInfo.h"
+#include "nsIDocument.h"
+
+/**
+ * We have to use macros here because our leak analysis tool things we are
+ * leaking strings when we have |static const nsString|. Sad :(
+ */
+#define LEVELCHANGE_EVENT_NAME NS_LITERAL_STRING("levelchange")
+#define CHARGINGCHANGE_EVENT_NAME NS_LITERAL_STRING("chargingchange")
+#define DISCHARGINGTIMECHANGE_EVENT_NAME NS_LITERAL_STRING("dischargingtimechange")
+#define CHARGINGTIMECHANGE_EVENT_NAME NS_LITERAL_STRING("chargingtimechange")
+
+namespace mozilla {
+namespace dom {
+namespace battery {
+
+BatteryManager::BatteryManager(nsPIDOMWindowInner* aWindow)
+ : DOMEventTargetHelper(aWindow)
+ , mLevel(kDefaultLevel)
+ , mCharging(kDefaultCharging)
+ , mRemainingTime(kDefaultRemainingTime)
+{
+}
+
+void
+BatteryManager::Init()
+{
+ hal::RegisterBatteryObserver(this);
+
+ hal::BatteryInformation batteryInfo;
+ hal::GetCurrentBatteryInformation(&batteryInfo);
+
+ UpdateFromBatteryInfo(batteryInfo);
+}
+
+void
+BatteryManager::Shutdown()
+{
+ hal::UnregisterBatteryObserver(this);
+}
+
+JSObject*
+BatteryManager::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+ return BatteryManagerBinding::Wrap(aCx, this, aGivenProto);
+}
+
+bool
+BatteryManager::Charging() const
+{
+ MOZ_ASSERT(NS_IsMainThread());
+ // For testing, unable to report the battery status information
+ if (Preferences::GetBool("dom.battery.test.default", false)) {
+ return true;
+ }
+ if (Preferences::GetBool("dom.battery.test.charging", false)) {
+ return true;
+ }
+ if (Preferences::GetBool("dom.battery.test.discharging", false)) {
+ return false;
+ }
+
+ return mCharging;
+}
+
+double
+BatteryManager::DischargingTime() const
+{
+ MOZ_ASSERT(NS_IsMainThread());
+ // For testing, unable to report the battery status information
+ if (Preferences::GetBool("dom.battery.test.default", false)) {
+ return std::numeric_limits<double>::infinity();
+ }
+ if (Preferences::GetBool("dom.battery.test.discharging", false)) {
+ return 42.0;
+ }
+
+ if (Charging() || mRemainingTime == kUnknownRemainingTime) {
+ return std::numeric_limits<double>::infinity();
+ }
+
+ return mRemainingTime;
+}
+
+double
+BatteryManager::ChargingTime() const
+{
+ MOZ_ASSERT(NS_IsMainThread());
+ // For testing, unable to report the battery status information
+ if (Preferences::GetBool("dom.battery.test.default", false)) {
+ return 0.0;
+ }
+ if (Preferences::GetBool("dom.battery.test.charging", false)) {
+ return 42.0;
+ }
+
+ if (!Charging() || mRemainingTime == kUnknownRemainingTime) {
+ return std::numeric_limits<double>::infinity();
+ }
+
+ return mRemainingTime;
+}
+
+double
+BatteryManager::Level() const
+{
+ MOZ_ASSERT(NS_IsMainThread());
+ // For testing, unable to report the battery status information
+ if (Preferences::GetBool("dom.battery.test.default")) {
+ return 1.0;
+ }
+
+ return mLevel;
+}
+
+void
+BatteryManager::UpdateFromBatteryInfo(const hal::BatteryInformation& aBatteryInfo)
+{
+ mLevel = aBatteryInfo.level();
+
+ // Round to the nearest ten percent for non-chrome and non-certified apps
+ nsIDocument* doc = GetOwner() ? GetOwner()->GetDoc() : nullptr;
+ uint16_t status = nsIPrincipal::APP_STATUS_NOT_INSTALLED;
+ if (doc) {
+ status = doc->NodePrincipal()->GetAppStatus();
+ }
+
+ mCharging = aBatteryInfo.charging();
+ mRemainingTime = aBatteryInfo.remainingTime();
+
+ if (!nsContentUtils::IsChromeDoc(doc) &&
+ status != nsIPrincipal::APP_STATUS_CERTIFIED)
+ {
+ mLevel = lround(mLevel * 10.0) / 10.0;
+ if (mLevel == 1.0) {
+ mRemainingTime = mCharging ? kDefaultRemainingTime : kUnknownRemainingTime;
+ } else if (mRemainingTime != kUnknownRemainingTime) {
+ // Round the remaining time to a multiple of 15 minutes and never zero
+ const double MINUTES_15 = 15.0 * 60.0;
+ mRemainingTime = fmax(lround(mRemainingTime / MINUTES_15) * MINUTES_15,
+ MINUTES_15);
+ }
+ }
+
+ // Add some guards to make sure the values are coherent.
+ if (mLevel == 1.0 && mCharging == true &&
+ mRemainingTime != kDefaultRemainingTime) {
+ mRemainingTime = kDefaultRemainingTime;
+ NS_ERROR("Battery API: When charging and level at 1.0, remaining time "
+ "should be 0. Please fix your backend!");
+ }
+}
+
+void
+BatteryManager::Notify(const hal::BatteryInformation& aBatteryInfo)
+{
+ double previousLevel = mLevel;
+ bool previousCharging = mCharging;
+ double previousRemainingTime = mRemainingTime;
+
+ UpdateFromBatteryInfo(aBatteryInfo);
+
+ if (previousCharging != mCharging) {
+ DispatchTrustedEvent(CHARGINGCHANGE_EVENT_NAME);
+ }
+
+ if (previousLevel != mLevel) {
+ DispatchTrustedEvent(LEVELCHANGE_EVENT_NAME);
+ }
+
+ /*
+ * There are a few situations that could happen here:
+ * 1. Charging state changed:
+ * a. Previous remaining time wasn't unkwonw, we have to fire an event for
+ * the change.
+ * b. New remaining time isn't unkwonw, we have to fire an event for it.
+ * 2. Charging state didn't change but remainingTime did, we have to fire
+ * the event that correspond to the current charging state.
+ */
+ if (mCharging != previousCharging) {
+ if (previousRemainingTime != kUnknownRemainingTime) {
+ DispatchTrustedEvent(previousCharging ? CHARGINGTIMECHANGE_EVENT_NAME
+ : DISCHARGINGTIMECHANGE_EVENT_NAME);
+ }
+ if (mRemainingTime != kUnknownRemainingTime) {
+ DispatchTrustedEvent(mCharging ? CHARGINGTIMECHANGE_EVENT_NAME
+ : DISCHARGINGTIMECHANGE_EVENT_NAME);
+ }
+ } else if (previousRemainingTime != mRemainingTime) {
+ DispatchTrustedEvent(mCharging ? CHARGINGTIMECHANGE_EVENT_NAME
+ : DISCHARGINGTIMECHANGE_EVENT_NAME);
+ }
+}
+
+} // namespace battery
+} // namespace dom
+} // namespace mozilla