gecko/hal/windows/WindowsBattery.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 04:12:37 -07:00
/* 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 "Hal.h"
#include "HalImpl.h"
#include "nsITimer.h"
#include "mozilla/Preferences.h"
#include "mozilla/dom/battery/Constants.h"
#include <windows.h>
#include "nsWindowsHelpers.h"
using namespace mozilla::dom::battery;
namespace mozilla {
namespace hal_impl {
static nsCOMPtr<nsITimer> sUpdateTimer;
/* Power Event API is Vista or later */
typedef HPOWERNOTIFY (WINAPI *REGISTERPOWERSETTINGNOTIFICATION) (HANDLE, LPCGUID, DWORD);
typedef BOOL (WINAPI *UNREGISTERPOWERSETTINGNOTIFICATION) (HPOWERNOTIFY);
static REGISTERPOWERSETTINGNOTIFICATION sRegisterPowerSettingNotification = nullptr;
static UNREGISTERPOWERSETTINGNOTIFICATION sUnregisterPowerSettingNotification = nullptr;
static HPOWERNOTIFY sPowerHandle = nullptr;
static HPOWERNOTIFY sCapacityHandle = nullptr;
static HWND sHWnd = nullptr;
static void
UpdateHandler(nsITimer* aTimer, void* aClosure) {
NS_ASSERTION(!IsVistaOrLater(),
"We shouldn't call this function for Vista or later version!");
static hal::BatteryInformation sLastInfo;
hal::BatteryInformation currentInfo;
hal_impl::GetCurrentBatteryInformation(&currentInfo);
if (sLastInfo.level() != currentInfo.level() ||
sLastInfo.charging() != currentInfo.charging() ||
sLastInfo.remainingTime() != currentInfo.remainingTime()) {
hal::NotifyBatteryChange(currentInfo);
sLastInfo = currentInfo;
}
}
static
LRESULT CALLBACK
BatteryWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
if (msg != WM_POWERBROADCAST || wParam != PBT_POWERSETTINGCHANGE) {
return DefWindowProc(hwnd, msg, wParam, lParam);
}
hal::BatteryInformation currentInfo;
// Since we need update remainingTime, we cannot use LPARAM.
hal_impl::GetCurrentBatteryInformation(&currentInfo);
hal::NotifyBatteryChange(currentInfo);
return TRUE;
}
void
EnableBatteryNotifications()
{
if (IsVistaOrLater()) {
// RegisterPowerSettingNotification is from Vista or later.
// Use this API if available.
HMODULE hUser32 = GetModuleHandleW(L"USER32.DLL");
if (!sRegisterPowerSettingNotification)
sRegisterPowerSettingNotification = (REGISTERPOWERSETTINGNOTIFICATION)
GetProcAddress(hUser32, "RegisterPowerSettingNotification");
if (!sUnregisterPowerSettingNotification)
sUnregisterPowerSettingNotification = (UNREGISTERPOWERSETTINGNOTIFICATION)
GetProcAddress(hUser32, "UnregisterPowerSettingNotification");
if (!sRegisterPowerSettingNotification ||
!sUnregisterPowerSettingNotification) {
NS_ASSERTION(false, "Canot find PowerSettingNotification functions.");
return;
}
// Create custom window to watch battery event
// If we can get Gecko's window handle, this is unnecessary.
if (sHWnd == nullptr) {
WNDCLASSW wc;
HMODULE hSelf = GetModuleHandle(nullptr);
if (!GetClassInfoW(hSelf, L"MozillaBatteryClass", &wc)) {
ZeroMemory(&wc, sizeof(WNDCLASSW));
wc.hInstance = hSelf;
wc.lpfnWndProc = BatteryWindowProc;
wc.lpszClassName = L"MozillaBatteryClass";
RegisterClassW(&wc);
}
sHWnd = CreateWindowW(L"MozillaBatteryClass", L"Battery Watcher",
0, 0, 0, 0, 0,
nullptr, nullptr, hSelf, nullptr);
}
if (sHWnd == nullptr) {
return;
}
sPowerHandle =
sRegisterPowerSettingNotification(sHWnd,
&GUID_ACDC_POWER_SOURCE,
DEVICE_NOTIFY_WINDOW_HANDLE);
sCapacityHandle =
sRegisterPowerSettingNotification(sHWnd,
&GUID_BATTERY_PERCENTAGE_REMAINING,
DEVICE_NOTIFY_WINDOW_HANDLE);
} else
{
// for Windows XP. If we remove Windows XP support,
// we should remove timer-based power notification
sUpdateTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
if (sUpdateTimer) {
sUpdateTimer->InitWithFuncCallback(UpdateHandler,
nullptr,
Preferences::GetInt("dom.battery.timer",
30000 /* 30s */),
nsITimer::TYPE_REPEATING_SLACK);
}
}
}
void
DisableBatteryNotifications()
{
if (IsVistaOrLater()) {
if (sPowerHandle) {
sUnregisterPowerSettingNotification(sPowerHandle);
sPowerHandle = nullptr;
}
if (sCapacityHandle) {
sUnregisterPowerSettingNotification(sCapacityHandle);
sCapacityHandle = nullptr;
}
if (sHWnd) {
DestroyWindow(sHWnd);
sHWnd = nullptr;
}
} else
{
if (sUpdateTimer) {
sUpdateTimer->Cancel();
sUpdateTimer = nullptr;
}
}
}
void
GetCurrentBatteryInformation(hal::BatteryInformation* aBatteryInfo)
{
SYSTEM_POWER_STATUS status;
if (!GetSystemPowerStatus(&status)) {
aBatteryInfo->level() = kDefaultLevel;
aBatteryInfo->charging() = kDefaultCharging;
aBatteryInfo->remainingTime() = kDefaultRemainingTime;
return;
}
aBatteryInfo->level() =
status.BatteryLifePercent == 255 ? kDefaultLevel
: ((double)status.BatteryLifePercent) / 100.0;
aBatteryInfo->charging() = (status.ACLineStatus != 0);
if (status.ACLineStatus != 0) {
if (aBatteryInfo->level() == 1.0) {
// GetSystemPowerStatus API may returns -1 for BatteryFullLifeTime.
// So, if battery is 100%, set kDefaultRemainingTime at force.
aBatteryInfo->remainingTime() = kDefaultRemainingTime;
} else {
aBatteryInfo->remainingTime() =
status.BatteryFullLifeTime == (DWORD)-1 ? kUnknownRemainingTime
: status.BatteryFullLifeTime;
}
} else {
aBatteryInfo->remainingTime() =
status.BatteryLifeTime == (DWORD)-1 ? kUnknownRemainingTime
: status.BatteryLifeTime;
}
}
} // hal_impl
} // mozilla