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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "content/browser/battery_status/battery_status_manager_win.h" | |
| 6 | |
| 7 #include "base/memory/ref_counted.h" | |
| 8 #include "base/strings/string16.h" | |
| 9 #include "base/win/message_window.h" | |
| 10 #include "base/win/windows_version.h" | |
| 11 #include "content/browser/battery_status/battery_status_manager.h" | |
| 12 #include "content/public/browser/browser_thread.h" | |
| 13 | |
| 14 namespace content { | |
| 15 | |
| 16 namespace { | |
| 17 | |
| 18 typedef BatteryStatusService::BatteryUpdateCallback BatteryCallback; | |
| 19 | |
| 20 const wchar_t kWindowClassName[] = L"BatteryStatusMessageWindow"; | |
| 21 | |
| 22 // Message-only window for handling battery changes on Windows. | |
| 23 class BatteryStatusObserver | |
| 24 : public base::RefCountedThreadSafe<BatteryStatusObserver> { | |
| 25 public: | |
| 26 explicit BatteryStatusObserver(const BatteryCallback& callback) | |
| 27 : power_handle_(NULL), | |
| 28 battery_change_handle_(NULL), | |
| 29 callback_(callback) { | |
| 30 } | |
| 31 | |
| 32 virtual ~BatteryStatusObserver() { DCHECK(!window_); } | |
| 33 | |
| 34 void Start() { | |
| 35 // Need to start on the UI thread to receive battery status notifications. | |
| 36 BrowserThread::PostTask( | |
| 37 BrowserThread::UI, | |
| 38 FROM_HERE, | |
| 39 base::Bind(&BatteryStatusObserver::StartOnUI, this)); | |
| 40 } | |
| 41 | |
| 42 void Stop() { | |
| 43 BrowserThread::PostTask( | |
| 44 BrowserThread::UI, | |
| 45 FROM_HERE, | |
| 46 base::Bind(&BatteryStatusObserver::StopOnUI, this)); | |
| 47 } | |
| 48 | |
| 49 private: | |
| 50 void StartOnUI() { | |
| 51 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); | |
| 52 if (window_) | |
| 53 return; | |
| 54 | |
| 55 if (CreateMessageWindow()) { | |
| 56 BatteryChanged(); | |
| 57 // RegisterPowerSettingNotification function work from Windows Vista | |
| 58 // onwards. However even without them we will receive notifications, | |
| 59 // e.g. when a power source is connected. | |
| 60 // TODO(timvolodine) : consider polling for battery changes on windows | |
| 61 // versions prior to Vista, see crbug.com/402466. | |
| 62 power_handle_ = | |
| 63 RegisterNotification(&GUID_ACDC_POWER_SOURCE); | |
| 64 battery_change_handle_ = | |
| 65 RegisterNotification(&GUID_BATTERY_PERCENTAGE_REMAINING); | |
| 66 } else { | |
| 67 // Could not create a message window, execute callback with the default | |
| 68 // values. | |
| 69 callback_.Run(blink::WebBatteryStatus()); | |
| 70 } | |
| 71 } | |
| 72 | |
| 73 void StopOnUI() { | |
| 74 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); | |
| 75 if (!window_) | |
| 76 return; | |
| 77 | |
| 78 if (power_handle_) | |
| 79 UnregisterNotification(power_handle_); | |
| 80 if (battery_change_handle_) | |
| 81 UnregisterNotification(battery_change_handle_); | |
| 82 window_.reset(); | |
| 83 } | |
| 84 | |
| 85 void BatteryChanged() { | |
| 86 SYSTEM_POWER_STATUS win_status; | |
| 87 if (GetSystemPowerStatus(&win_status)) | |
| 88 callback_.Run(ComputeWebBatteryStatus(win_status)); | |
| 89 else | |
| 90 callback_.Run(blink::WebBatteryStatus()); | |
| 91 } | |
| 92 | |
| 93 bool HandleMessage(UINT message, | |
| 94 WPARAM wparam, | |
| 95 LPARAM lparam, | |
| 96 LRESULT* result) { | |
| 97 switch(message) { | |
| 98 case WM_POWERBROADCAST: | |
| 99 if (wparam == PBT_APMPOWERSTATUSCHANGE || | |
| 100 wparam == PBT_POWERSETTINGCHANGE) { | |
| 101 BatteryChanged(); | |
| 102 } | |
| 103 *result = NULL; | |
| 104 return true; | |
| 105 default: | |
| 106 return false; | |
| 107 } | |
| 108 } | |
| 109 | |
| 110 HPOWERNOTIFY RegisterNotification(LPCGUID power_setting) { | |
| 111 if (base::win::GetVersion() < base::win::VERSION_VISTA) | |
| 112 return NULL; | |
| 113 | |
| 114 return RegisterPowerSettingNotification(window_->hwnd(), power_setting, | |
| 115 DEVICE_NOTIFY_WINDOW_HANDLE); | |
| 116 } | |
| 117 | |
| 118 BOOL UnregisterNotification(HPOWERNOTIFY handle) { | |
| 119 if (base::win::GetVersion() < base::win::VERSION_VISTA) | |
| 120 return FALSE; | |
| 121 | |
| 122 return UnregisterPowerSettingNotification(handle); | |
| 123 } | |
| 124 | |
| 125 bool CreateMessageWindow() { | |
| 126 // TODO(timvolodine): consider reusing the message window of PowerMonitor. | |
| 127 window_.reset(new base::win::MessageWindow()); | |
| 128 if (!window_->CreateNamed(base::Bind(&BatteryStatusObserver::HandleMessage, | |
| 129 base::Unretained(this)), | |
| 130 base::string16(kWindowClassName))) { | |
| 131 LOG(ERROR) << "Failed to create message window: " << kWindowClassName; | |
| 132 window_.reset(); | |
| 133 return false; | |
| 134 } | |
| 135 return true; | |
| 136 } | |
| 137 | |
| 138 HPOWERNOTIFY power_handle_; | |
| 139 HPOWERNOTIFY battery_change_handle_; | |
| 140 BatteryCallback callback_; | |
| 141 scoped_ptr<base::win::MessageWindow> window_; | |
| 142 | |
| 143 DISALLOW_COPY_AND_ASSIGN(BatteryStatusObserver); | |
| 144 }; | |
| 145 | |
| 146 class BatteryStatusManagerWin : public BatteryStatusManager { | |
| 147 public: | |
| 148 explicit BatteryStatusManagerWin(const BatteryCallback& callback) | |
| 149 : battery_observer_(new BatteryStatusObserver(callback)) {} | |
| 150 virtual ~BatteryStatusManagerWin() { battery_observer_->Stop(); } | |
| 151 | |
| 152 public: | |
| 153 // BatteryStatusManager: | |
| 154 virtual bool StartListeningBatteryChange() OVERRIDE { | |
| 155 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); | |
| 156 battery_observer_->Start(); | |
| 157 return true; | |
| 158 } | |
| 159 | |
| 160 virtual void StopListeningBatteryChange() OVERRIDE { | |
| 161 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); | |
| 162 battery_observer_->Stop(); | |
| 163 } | |
| 164 | |
| 165 private: | |
| 166 scoped_refptr<BatteryStatusObserver> battery_observer_; | |
| 167 | |
| 168 DISALLOW_COPY_AND_ASSIGN(BatteryStatusManagerWin); | |
| 169 }; | |
| 170 | |
| 171 } // namespace | |
| 172 | |
| 173 blink::WebBatteryStatus ComputeWebBatteryStatus( | |
| 174 const SYSTEM_POWER_STATUS& win_status) { | |
| 175 blink::WebBatteryStatus status; | |
| 176 status.charging = win_status.ACLineStatus != WIN_AC_LINE_STATUS_OFFLINE; | |
| 177 | |
| 178 // Set level if available. Otherwise keep the default value which is 1. | |
| 179 if (win_status.BatteryLifePercent != 255) { | |
| 180 // Convert percentage to a value between 0 and 1 with 2 significant digits. | |
| 181 status.level = static_cast<double>(win_status.BatteryLifePercent) / 100.; | |
| 182 } | |
| 183 | |
| 184 if (!status.charging) { | |
| 185 // Set dischargingTime if available otherwise keep the default value, | |
| 186 // which is +Infinity. | |
| 187 if (win_status.BatteryLifeTime != (DWORD)-1) | |
| 188 status.dischargingTime = win_status.BatteryLifeTime; | |
| 189 status.chargingTime = std::numeric_limits<double>::infinity(); | |
| 190 } else { | |
| 191 // Set chargingTime to +Infinity if not fully charged, otherwise leave the | |
| 192 // default value, which is 0. | |
| 193 if (status.level < 1) | |
| 194 status.chargingTime = std::numeric_limits<double>::infinity(); | |
| 195 } | |
| 196 return status; | |
| 197 } | |
| 198 | |
| 199 // static | |
| 200 scoped_ptr<BatteryStatusManager> BatteryStatusManager::Create( | |
| 201 const BatteryStatusService::BatteryUpdateCallback& callback) { | |
| 202 return scoped_ptr<BatteryStatusManager>( | |
| 203 new BatteryStatusManagerWin(callback)); | |
| 204 } | |
| 205 | |
| 206 } // namespace content | |
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Chromium Code Reviews
Issue 476203002:
Revert 289634 "Battery Status API: implementation for Windows." (Closed)
Base URL: svn://svn.chromium.org/chrome/branches/2124/src/