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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 #ifndef BASE_POWER_MONITOR_POWER_MONITOR_DEVICE_SOURCE_H_
      6 #define BASE_POWER_MONITOR_POWER_MONITOR_DEVICE_SOURCE_H_
      7 
      8 #include "base/base_export.h"
      9 #include "base/macros.h"
     10 #include "base/power_monitor/power_monitor_source.h"
     11 #include "base/power_monitor/power_observer.h"
     12 #include "build/build_config.h"
     13 
     14 #if defined(OS_WIN)
     15 #include <windows.h>
     16 #endif  // !OS_WIN
     17 
     18 #if defined(OS_IOS)
     19 #include <objc/runtime.h>
     20 #endif  // OS_IOS
     21 
     22 namespace base {
     23 
     24 // A class used to monitor the power state change and notify the observers about
     25 // the change event.
     26 class BASE_EXPORT PowerMonitorDeviceSource : public PowerMonitorSource {
     27  public:
     28   PowerMonitorDeviceSource();
     29   ~PowerMonitorDeviceSource() override;
     30 
     31   void Shutdown() override;
     32 
     33 #if defined(OS_MACOSX)
     34   // Allocate system resources needed by the PowerMonitor class.
     35   //
     36   // This function must be called before instantiating an instance of the class
     37   // and before the Sandbox is initialized.
     38 #if !defined(OS_IOS)
     39   static void AllocateSystemIOPorts();
     40 #else
     41   static void AllocateSystemIOPorts() {}
     42 #endif  // OS_IOS
     43 #endif  // OS_MACOSX
     44 
     45 #if defined(OS_CHROMEOS)
     46   // On Chrome OS, Chrome receives power-related events from powerd, the system
     47   // power daemon, via D-Bus signals received on the UI thread. base can't
     48   // directly depend on that code, so this class instead exposes static methods
     49   // so that events can be passed in.
     50   static void SetPowerSource(bool on_battery);
     51   static void HandleSystemSuspending();
     52   static void HandleSystemResumed();
     53 #endif
     54 
     55  private:
     56 #if defined(OS_WIN)
     57   // Represents a message-only window for power message handling on Windows.
     58   // Only allow PowerMonitor to create it.
     59   class PowerMessageWindow {
     60    public:
     61     PowerMessageWindow();
     62     ~PowerMessageWindow();
     63 
     64    private:
     65     static LRESULT CALLBACK WndProcThunk(HWND hwnd,
     66                                          UINT message,
     67                                          WPARAM wparam,
     68                                          LPARAM lparam);
     69     // Instance of the module containing the window procedure.
     70     HMODULE instance_;
     71     // A hidden message-only window.
     72     HWND message_hwnd_;
     73   };
     74 #endif  // OS_WIN
     75 
     76 #if defined(OS_MACOSX)
     77   void PlatformInit();
     78   void PlatformDestroy();
     79 #endif
     80 
     81   // Platform-specific method to check whether the system is currently
     82   // running on battery power.  Returns true if running on batteries,
     83   // false otherwise.
     84   bool IsOnBatteryPowerImpl() override;
     85 
     86 #if defined(OS_IOS)
     87   // Holds pointers to system event notification observers.
     88   std::vector<id> notification_observers_;
     89 #endif
     90 
     91 #if defined(OS_WIN)
     92   PowerMessageWindow power_message_window_;
     93 #endif
     94 
     95   DISALLOW_COPY_AND_ASSIGN(PowerMonitorDeviceSource);
     96 };
     97 
     98 }  // namespace base
     99 
    100 #endif  // BASE_POWER_MONITOR_POWER_MONITOR_DEVICE_SOURCE_H_
    101