ui/events/ozone/evdev/libgestures_glue/event_reader_libevdev_cros.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 UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_EVENT_READER_LIBEVDEV_CROS_H_
   6 #define UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_EVENT_READER_LIBEVDEV_CROS_H_
   7
   8 #include <libevdev/libevdev.h>
   9
  10 #include "base/files/file_path.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "ui/events/ozone/evdev/event_converter_evdev.h"
  13 #include "ui/events/ozone/evdev/event_device_info.h"
  14
  15 namespace ui {
  16
  17 // Basic wrapper for libevdev-cros.
  18 //
  19 // This drives libevdev-cros from a file descriptor and calls delegate
  20 // with the updated event state from libevdev-cros.
  21 //
  22 // The library doesn't support all devices currently. In particular there
  23 // is no support for keyboard events.
  24 class EventReaderLibevdevCros : public EventConverterEvdev {
  25  public:
  26   class Delegate {
  27    public:
  28     virtual ~Delegate();
  29
  30     // Notifier for open. This is called with the initial event state.
  31     virtual void OnLibEvdevCrosOpen(Evdev* evdev, EventStateRec* evstate) = 0;
  32
  33     // Notifier for event. This is called with the updated event state.
  34     virtual void OnLibEvdevCrosEvent(Evdev* evdev,
  35                                      EventStateRec* state,
  36                                      const timeval& time) = 0;
  37
  38     // Notifier for stop. This is called with the final event state.
  39     virtual void OnLibEvdevCrosStopped(Evdev* evdev, EventStateRec* state) = 0;
  40   };
  41
  42   EventReaderLibevdevCros(int fd,
  43                           const base::FilePath& path,
  44                           int id,
  45                           const EventDeviceInfo& devinfo,
  46                           scoped_ptr<Delegate> delegate);
  47   ~EventReaderLibevdevCros() override;
  48
  49   // EventConverterEvdev:
  50   void OnFileCanReadWithoutBlocking(int fd) override;
  51   bool HasKeyboard() const override;
  52   bool HasMouse() const override;
  53   bool HasTouchpad() const override;
  54   bool HasCapsLockLed() const override;
  55   void OnDisabled() override;
  56
  57  private:
  58   static void OnSynReport(void* data,
  59                           EventStateRec* evstate,
  60                           struct timeval* tv);
  61   static void OnLogMessage(void*, int level, const char*, ...);
  62
  63   // Input modalities for this device.
  64   bool has_keyboard_;
  65   bool has_mouse_;
  66   bool has_touchpad_;
  67
  68   // LEDs for this device.
  69   bool has_caps_lock_led_;
  70
  71   // Libevdev state.
  72   Evdev evdev_;
  73
  74   // Event state.
  75   EventStateRec evstate_;
  76
  77   // Path to input device.
  78   base::FilePath path_;
  79
  80   // Delegate for event processing.
  81   scoped_ptr<Delegate> delegate_;
  82
  83   DISALLOW_COPY_AND_ASSIGN(EventReaderLibevdevCros);
  84 };
  85
  86 }  // namspace ui
  87
  88 #endif  // UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_EVENT_READER_LIBEVDEV_CROS_H_