Index: content/browser/battery_status/battery_status_manager_win.cc |
diff --git a/content/browser/battery_status/battery_status_manager_win.cc b/content/browser/battery_status/battery_status_manager_win.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..d998d5aca0e2ab6405e323d659aa894cf179ef34 |
--- /dev/null |
+++ b/content/browser/battery_status/battery_status_manager_win.cc |
@@ -0,0 +1,206 @@ |
+// Copyright 2014 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "content/browser/battery_status/battery_status_manager_win.h" |
+ |
+#include "base/memory/ref_counted.h" |
+#include "base/strings/string16.h" |
+#include "base/win/message_window.h" |
+#include "base/win/windows_version.h" |
+#include "content/browser/battery_status/battery_status_manager.h" |
+#include "content/public/browser/browser_thread.h" |
+ |
+namespace content { |
+ |
+namespace { |
+ |
+typedef BatteryStatusService::BatteryUpdateCallback BatteryCallback; |
+ |
+const wchar_t kWindowClassName[] = L"BatteryStatusMessageWindow"; |
+ |
+// Message-only window for handling battery changes on Windows. |
+class BatteryStatusObserver |
+ : public base::RefCountedThreadSafe<BatteryStatusObserver> { |
+ public: |
+ explicit BatteryStatusObserver(const BatteryCallback& callback) |
+ : power_handle_(NULL), |
+ battery_change_handle_(NULL), |
+ callback_(callback) { |
+ } |
+ |
+ virtual ~BatteryStatusObserver() { DCHECK(!window_); } |
+ |
+ void Start() { |
+ // Need to start on the UI thread to receive battery status notifications. |
+ BrowserThread::PostTask( |
+ BrowserThread::UI, |
+ FROM_HERE, |
+ base::Bind(&BatteryStatusObserver::StartOnUI, this)); |
+ } |
+ |
+ void Stop() { |
+ BrowserThread::PostTask( |
+ BrowserThread::UI, |
+ FROM_HERE, |
+ base::Bind(&BatteryStatusObserver::StopOnUI, this)); |
+ } |
+ |
+ private: |
+ void StartOnUI() { |
+ DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); |
+ if (window_) |
+ return; |
+ |
+ if (CreateMessageWindow()) { |
+ BatteryChanged(); |
+ // RegisterPowerSettingNotification function work from Windows Vista |
+ // onwards. However even without them we will receive notifications, |
+ // e.g. when a power source is connected. |
+ // TODO(timvolodine) : consider polling for battery changes on windows |
+ // versions prior to Vista, see crbug.com/402466. |
+ power_handle_ = |
+ RegisterNotification(&GUID_ACDC_POWER_SOURCE); |
+ battery_change_handle_ = |
+ RegisterNotification(&GUID_BATTERY_PERCENTAGE_REMAINING); |
+ } else { |
+ // Could not create a message window, execute callback with the default |
+ // values. |
+ callback_.Run(blink::WebBatteryStatus()); |
+ } |
+ } |
+ |
+ void StopOnUI() { |
+ DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); |
+ if (!window_) |
+ return; |
+ |
+ if (power_handle_) |
+ UnregisterNotification(power_handle_); |
+ if (battery_change_handle_) |
+ UnregisterNotification(battery_change_handle_); |
+ window_.reset(); |
+ } |
+ |
+ void BatteryChanged() { |
+ SYSTEM_POWER_STATUS win_status; |
+ if (GetSystemPowerStatus(&win_status)) |
+ callback_.Run(ComputeWebBatteryStatus(win_status)); |
+ else |
+ callback_.Run(blink::WebBatteryStatus()); |
+ } |
+ |
+ bool HandleMessage(UINT message, |
+ WPARAM wparam, |
+ LPARAM lparam, |
+ LRESULT* result) { |
+ switch(message) { |
+ case WM_POWERBROADCAST: |
+ if (wparam == PBT_APMPOWERSTATUSCHANGE || |
+ wparam == PBT_POWERSETTINGCHANGE) { |
+ BatteryChanged(); |
+ } |
+ *result = NULL; |
+ return true; |
+ default: |
+ return false; |
+ } |
+ } |
+ |
+ HPOWERNOTIFY RegisterNotification(LPCGUID power_setting) { |
+ if (base::win::GetVersion() < base::win::VERSION_VISTA) |
+ return NULL; |
+ |
+ return RegisterPowerSettingNotification(window_->hwnd(), power_setting, |
+ DEVICE_NOTIFY_WINDOW_HANDLE); |
+ } |
+ |
+ BOOL UnregisterNotification(HPOWERNOTIFY handle) { |
+ if (base::win::GetVersion() < base::win::VERSION_VISTA) |
+ return FALSE; |
+ |
+ return UnregisterPowerSettingNotification(handle); |
+ } |
+ |
+ bool CreateMessageWindow() { |
+ // TODO(timvolodine): consider reusing the message window of PowerMonitor. |
+ window_.reset(new base::win::MessageWindow()); |
+ if (!window_->CreateNamed(base::Bind(&BatteryStatusObserver::HandleMessage, |
+ base::Unretained(this)), |
+ base::string16(kWindowClassName))) { |
+ LOG(ERROR) << "Failed to create message window: " << kWindowClassName; |
+ window_.reset(); |
+ return false; |
+ } |
+ return true; |
+ } |
+ |
+ HPOWERNOTIFY power_handle_; |
+ HPOWERNOTIFY battery_change_handle_; |
+ BatteryCallback callback_; |
+ scoped_ptr<base::win::MessageWindow> window_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(BatteryStatusObserver); |
+}; |
+ |
+class BatteryStatusManagerWin : public BatteryStatusManager { |
+ public: |
+ explicit BatteryStatusManagerWin(const BatteryCallback& callback) |
+ : battery_observer_(new BatteryStatusObserver(callback)) {} |
+ virtual ~BatteryStatusManagerWin() { battery_observer_->Stop(); } |
+ |
+ public: |
+ // BatteryStatusManager: |
+ virtual bool StartListeningBatteryChange() OVERRIDE { |
+ DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); |
+ battery_observer_->Start(); |
+ return true; |
+ } |
+ |
+ virtual void StopListeningBatteryChange() OVERRIDE { |
+ DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); |
+ battery_observer_->Stop(); |
+ } |
+ |
+ private: |
+ scoped_refptr<BatteryStatusObserver> battery_observer_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(BatteryStatusManagerWin); |
+}; |
+ |
+} // namespace |
+ |
+blink::WebBatteryStatus ComputeWebBatteryStatus( |
+ const SYSTEM_POWER_STATUS& win_status) { |
+ blink::WebBatteryStatus status; |
+ status.charging = win_status.ACLineStatus != WIN_AC_LINE_STATUS_OFFLINE; |
+ |
+ // Set level if available. Otherwise keep the default value which is 1. |
+ if (win_status.BatteryLifePercent != 255) { |
+ // Convert percentage to a value between 0 and 1 with 2 significant digits. |
+ status.level = static_cast<double>(win_status.BatteryLifePercent) / 100.; |
+ } |
+ |
+ if (!status.charging) { |
+ // Set dischargingTime if available otherwise keep the default value, |
+ // which is +Infinity. |
+ if (win_status.BatteryLifeTime != (DWORD)-1) |
+ status.dischargingTime = win_status.BatteryLifeTime; |
+ status.chargingTime = std::numeric_limits<double>::infinity(); |
+ } else { |
+ // Set chargingTime to +Infinity if not fully charged, otherwise leave the |
+ // default value, which is 0. |
+ if (status.level < 1) |
+ status.chargingTime = std::numeric_limits<double>::infinity(); |
+ } |
+ return status; |
+} |
+ |
+// static |
+scoped_ptr<BatteryStatusManager> BatteryStatusManager::Create( |
+ const BatteryStatusService::BatteryUpdateCallback& callback) { |
+ return scoped_ptr<BatteryStatusManager>( |
+ new BatteryStatusManagerWin(callback)); |
+} |
+ |
+} // namespace content |