1// Copyright 2013 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 "base/power_monitor/power_monitor.h"
6#include "base/power_monitor/power_monitor_device_source.h"
7#include "base/power_monitor/power_monitor_source.h"
8#include "base/win/wrapped_window_proc.h"
9
10namespace base {
11
12void ProcessPowerEventHelper(PowerMonitorSource::PowerEvent event) {
13  PowerMonitorSource::ProcessPowerEvent(event);
14}
15
16namespace {
17
18const wchar_t kWindowClassName[] = L"Base_PowerMessageWindow";
19
20void ProcessWmPowerBroadcastMessage(WPARAM event_id) {
21  PowerMonitorSource::PowerEvent power_event;
22  switch (event_id) {
23    case PBT_APMPOWERSTATUSCHANGE:  // The power status changed.
24      power_event = PowerMonitorSource::POWER_STATE_EVENT;
25      break;
26    case PBT_APMRESUMEAUTOMATIC:  // Resume from suspend.
27      //case PBT_APMRESUMESUSPEND:  // User-initiated resume from suspend.
28      // We don't notify for this latter event
29      // because if it occurs it is always sent as a
30      // second event after PBT_APMRESUMEAUTOMATIC.
31      power_event = PowerMonitorSource::RESUME_EVENT;
32      break;
33    case PBT_APMSUSPEND:  // System has been suspended.
34      power_event = PowerMonitorSource::SUSPEND_EVENT;
35      break;
36    default:
37      return;
38
39      // Other Power Events:
40      // PBT_APMBATTERYLOW - removed in Vista.
41      // PBT_APMOEMEVENT - removed in Vista.
42      // PBT_APMQUERYSUSPEND - removed in Vista.
43      // PBT_APMQUERYSUSPENDFAILED - removed in Vista.
44      // PBT_APMRESUMECRITICAL - removed in Vista.
45      // PBT_POWERSETTINGCHANGE - user changed the power settings.
46  }
47
48  ProcessPowerEventHelper(power_event);
49}
50
51}  // namespace
52
53// Function to query the system to see if it is currently running on
54// battery power.  Returns true if running on battery.
55bool PowerMonitorDeviceSource::IsOnBatteryPowerImpl() {
56  SYSTEM_POWER_STATUS status;
57  if (!GetSystemPowerStatus(&status)) {
58    DPLOG(ERROR) << "GetSystemPowerStatus failed";
59    return false;
60  }
61  return (status.ACLineStatus == 0);
62}
63
64PowerMonitorDeviceSource::PowerMessageWindow::PowerMessageWindow()
65    : instance_(NULL), message_hwnd_(NULL) {
66  if (!MessageLoopForUI::IsCurrent()) {
67    // Creating this window in (e.g.) a renderer inhibits shutdown on Windows.
68    // See http://crbug.com/230122. TODO(vandebo): http://crbug.com/236031
69    DLOG(ERROR)
70        << "Cannot create windows on non-UI thread, power monitor disabled!";
71    return;
72  }
73  WNDCLASSEX window_class;
74  base::win::InitializeWindowClass(
75      kWindowClassName,
76      &base::win::WrappedWindowProc<
77          PowerMonitorDeviceSource::PowerMessageWindow::WndProcThunk>,
78      0, 0, 0, NULL, NULL, NULL, NULL, NULL,
79      &window_class);
80  instance_ = window_class.hInstance;
81  ATOM clazz = RegisterClassEx(&window_class);
82  DCHECK(clazz);
83
84  message_hwnd_ = CreateWindowEx(WS_EX_NOACTIVATE, kWindowClassName,
85      NULL, WS_POPUP, 0, 0, 0, 0, NULL, NULL, instance_, NULL);
86}
87
88PowerMonitorDeviceSource::PowerMessageWindow::~PowerMessageWindow() {
89  if (message_hwnd_) {
90    DestroyWindow(message_hwnd_);
91    UnregisterClass(kWindowClassName, instance_);
92  }
93}
94
95// static
96LRESULT CALLBACK PowerMonitorDeviceSource::PowerMessageWindow::WndProcThunk(
97    HWND hwnd,
98    UINT message,
99    WPARAM wparam,
100    LPARAM lparam) {
101  switch (message) {
102    case WM_POWERBROADCAST:
103      ProcessWmPowerBroadcastMessage(wparam);
104      return TRUE;
105    default:
106      return ::DefWindowProc(hwnd, message, wparam, lparam);
107  }
108}
109
110}  // namespace base
111