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      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 
     10 namespace base {
     11 
     12 void ProcessPowerEventHelper(PowerMonitorSource::PowerEvent event) {
     13   PowerMonitorSource::ProcessPowerEvent(event);
     14 }
     15 
     16 namespace {
     17 
     18 const wchar_t kWindowClassName[] = L"Base_PowerMessageWindow";
     19 
     20 void 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.
     55 bool 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 
     64 PowerMonitorDeviceSource::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 
     88 PowerMonitorDeviceSource::PowerMessageWindow::~PowerMessageWindow() {
     89   if (message_hwnd_) {
     90     DestroyWindow(message_hwnd_);
     91     UnregisterClass(kWindowClassName, instance_);
     92   }
     93 }
     94 
     95 // static
     96 LRESULT 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