device/hid/input_service_linux.h

   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 #ifndef DEVICE_HID_INPUT_SERVICE_LINUX_H_
   6 #define DEVICE_HID_INPUT_SERVICE_LINUX_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/compiler_specific.h"
  12 #include "base/containers/hash_tables.h"
  13 #include "base/macros.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/message_loop/message_loop.h"
  16 #include "base/observer_list.h"
  17 #include "base/threading/thread_checker.h"
  18 #include "device/hid/device_monitor_linux.h"
  19
  20 namespace device {
  21
  22 // This class provides information and notifications about
  23 // connected/disconnected input/HID devices. This class is *NOT*
  24 // thread-safe and all methods must be called from the FILE thread.
  25 class InputServiceLinux : public base::MessageLoop::DestructionObserver {
  26  public:
  27   struct InputDeviceInfo {
  28     enum Subsystem { SUBSYSTEM_HID, SUBSYSTEM_INPUT, SUBSYSTEM_UNKNOWN };
  29     enum Type { TYPE_BLUETOOTH, TYPE_USB, TYPE_SERIO, TYPE_UNKNOWN };
  30
  31     InputDeviceInfo();
  32
  33     std::string id;
  34     std::string name;
  35     Subsystem subsystem;
  36     Type type;
  37
  38     bool is_accelerometer : 1;
  39     bool is_joystick : 1;
  40     bool is_key : 1;
  41     bool is_keyboard : 1;
  42     bool is_mouse : 1;
  43     bool is_tablet : 1;
  44     bool is_touchpad : 1;
  45     bool is_touchscreen : 1;
  46   };
  47
  48
  49   using DeviceMap = base::hash_map<std::string, InputDeviceInfo>;
  50
  51   class Observer {
  52    public:
  53     virtual ~Observer() {}
  54     virtual void OnInputDeviceAdded(const InputDeviceInfo& info) = 0;
  55     virtual void OnInputDeviceRemoved(const std::string& id) = 0;
  56   };
  57
  58   InputServiceLinux();
  59   ~InputServiceLinux() override;
  60
  61   static InputServiceLinux* GetInstance();
  62   static bool HasInstance();
  63   static void SetForTesting(InputServiceLinux* service);
  64
  65   void AddObserver(Observer* observer);
  66   void RemoveObserver(Observer* observer);
  67
  68   // Returns list of all currently connected input/hid devices.
  69   void GetDevices(std::vector<InputDeviceInfo>* devices);
  70
  71   // Returns an info about input device identified by |id|. When there're
  72   // no input or hid device with such id, returns false and doesn't
  73   // modify |info|.
  74   bool GetDeviceInfo(const std::string& id, InputDeviceInfo* info) const;
  75
  76   // Implements base::MessageLoop::DestructionObserver
  77   void WillDestroyCurrentMessageLoop() override;
  78
  79  protected:
  80
  81   void AddDevice(const InputDeviceInfo& info);
  82   void RemoveDevice(const std::string& id);
  83
  84   bool CalledOnValidThread() const;
  85
  86   DeviceMap devices_;
  87   ObserverList<Observer> observers_;
  88
  89  private:
  90   friend struct base::DefaultDeleter<InputServiceLinux>;
  91
  92   base::ThreadChecker thread_checker_;
  93
  94   DISALLOW_COPY_AND_ASSIGN(InputServiceLinux);
  95 };
  96
  97 }  // namespace device
  98
  99 #endif  // DEVICE_HID_INPUT_SERVICE_LINUX_H_