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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
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