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