gecko/dom/battery/BatteryManager.cpp
2012-05-21 12:12:37 +01:00

212 lines
6.3 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 <limits>
#include "mozilla/Hal.h"
#include "BatteryManager.h"
#include "nsIDOMClassInfo.h"
#include "Constants.h"
#include "nsDOMEvent.h"
#include "mozilla/Preferences.h"
#include "nsDOMEventTargetHelper.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")
DOMCI_DATA(MozBatteryManager, mozilla::dom::battery::BatteryManager)
namespace mozilla {
namespace dom {
namespace battery {
NS_IMPL_CYCLE_COLLECTION_CLASS(BatteryManager)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(BatteryManager,
nsDOMEventTargetHelper)
NS_CYCLE_COLLECTION_TRAVERSE_EVENT_HANDLER(levelchange)
NS_CYCLE_COLLECTION_TRAVERSE_EVENT_HANDLER(chargingchange)
NS_CYCLE_COLLECTION_TRAVERSE_EVENT_HANDLER(chargingtimechange)
NS_CYCLE_COLLECTION_TRAVERSE_EVENT_HANDLER(dischargingtimechange)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(BatteryManager,
nsDOMEventTargetHelper)
NS_CYCLE_COLLECTION_UNLINK_EVENT_HANDLER(levelchange)
NS_CYCLE_COLLECTION_UNLINK_EVENT_HANDLER(chargingchange)
NS_CYCLE_COLLECTION_UNLINK_EVENT_HANDLER(chargingtimechange)
NS_CYCLE_COLLECTION_UNLINK_EVENT_HANDLER(dischargingtimechange)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(BatteryManager)
NS_INTERFACE_MAP_ENTRY(nsIDOMMozBatteryManager)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(MozBatteryManager)
NS_INTERFACE_MAP_END_INHERITING(nsDOMEventTargetHelper)
NS_IMPL_ADDREF_INHERITED(BatteryManager, nsDOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(BatteryManager, nsDOMEventTargetHelper)
BatteryManager::BatteryManager()
: mLevel(kDefaultLevel)
, mCharging(kDefaultCharging)
, mRemainingTime(kDefaultRemainingTime)
{
}
void
BatteryManager::Init(nsPIDOMWindow *aWindow)
{
BindToOwner(aWindow);
hal::RegisterBatteryObserver(this);
hal::BatteryInformation batteryInfo;
hal::GetCurrentBatteryInformation(&batteryInfo);
UpdateFromBatteryInfo(batteryInfo);
}
void
BatteryManager::Shutdown()
{
hal::UnregisterBatteryObserver(this);
}
NS_IMETHODIMP
BatteryManager::GetCharging(bool* aCharging)
{
*aCharging = mCharging;
return NS_OK;
}
NS_IMETHODIMP
BatteryManager::GetLevel(double* aLevel)
{
*aLevel = mLevel;
return NS_OK;
}
NS_IMETHODIMP
BatteryManager::GetDischargingTime(double* aDischargingTime)
{
if (mCharging || mRemainingTime == kUnknownRemainingTime) {
*aDischargingTime = std::numeric_limits<double>::infinity();
return NS_OK;
}
*aDischargingTime = mRemainingTime;
return NS_OK;
}
NS_IMETHODIMP
BatteryManager::GetChargingTime(double* aChargingTime)
{
if (!mCharging || mRemainingTime == kUnknownRemainingTime) {
*aChargingTime = std::numeric_limits<double>::infinity();
return NS_OK;
}
*aChargingTime = mRemainingTime;
return NS_OK;
}
NS_IMPL_EVENT_HANDLER(BatteryManager, levelchange)
NS_IMPL_EVENT_HANDLER(BatteryManager, chargingchange)
NS_IMPL_EVENT_HANDLER(BatteryManager, chargingtimechange)
NS_IMPL_EVENT_HANDLER(BatteryManager, dischargingtimechange)
nsresult
BatteryManager::DispatchTrustedEventToSelf(const nsAString& aEventName)
{
nsRefPtr<nsDOMEvent> event = new nsDOMEvent(nsnull, nsnull);
nsresult rv = event->InitEvent(aEventName, false, false);
NS_ENSURE_SUCCESS(rv, rv);
rv = event->SetTrusted(true);
NS_ENSURE_SUCCESS(rv, rv);
bool dummy;
rv = DispatchEvent(event, &dummy);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
void
BatteryManager::UpdateFromBatteryInfo(const hal::BatteryInformation& aBatteryInfo)
{
mLevel = aBatteryInfo.level();
mCharging = aBatteryInfo.charging();
mRemainingTime = aBatteryInfo.remainingTime();
// 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) {
DispatchTrustedEventToSelf(CHARGINGCHANGE_EVENT_NAME);
}
if (previousLevel != mLevel) {
DispatchTrustedEventToSelf(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) {
DispatchTrustedEventToSelf(previousCharging ? CHARGINGTIMECHANGE_EVENT_NAME
: DISCHARGINGTIMECHANGE_EVENT_NAME);
}
if (mRemainingTime != kUnknownRemainingTime) {
DispatchTrustedEventToSelf(mCharging ? CHARGINGTIMECHANGE_EVENT_NAME
: DISCHARGINGTIMECHANGE_EVENT_NAME);
}
} else if (previousRemainingTime != mRemainingTime) {
DispatchTrustedEventToSelf(mCharging ? CHARGINGTIMECHANGE_EVENT_NAME
: DISCHARGINGTIMECHANGE_EVENT_NAME);
}
}
/* static */ bool
BatteryManager::HasSupport()
{
return Preferences::GetBool("dom.battery.enabled", true);
}
} // namespace battery
} // namespace dom
} // namespace mozilla