ui/events/ozone/evdev/keyboard_evdev.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_KEYBOARD_EVDEV_H_
   6 #define UI_EVENTS_OZONE_EVDEV_KEYBOARD_EVDEV_H_
   7
   8 #include <bitset>
   9 #include <linux/input.h>
  10
  11 #include "base/time/time.h"
  12 #include "base/timer/timer.h"
  13 #include "ui/events/ozone/evdev/event_device_util.h"
  14 #include "ui/events/ozone/evdev/event_dispatch_callback.h"
  15 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
  16 #include "ui/events/ozone/layout/keyboard_layout_engine.h"
  17
  18 namespace ui {
  19
  20 class EventModifiersEvdev;
  21 enum class DomCode;
  22
  23 // Keyboard for evdev.
  24 //
  25 // This object is responsible for combining all attached keyboards into
  26 // one logical keyboard, applying modifiers & implementing key repeat.
  27 //
  28 // It also currently also applies the layout.
  29 class EVENTS_OZONE_EVDEV_EXPORT KeyboardEvdev {
  30  public:
  31   KeyboardEvdev(EventModifiersEvdev* modifiers,
  32                 KeyboardLayoutEngine* keyboard_layout_engine,
  33                 const EventDispatchCallback& callback);
  34   ~KeyboardEvdev();
  35
  36   // Handlers for raw key presses & releases.
  37   void OnKeyChange(unsigned int code, bool down, base::TimeDelta timestamp);
  38
  39   // Handle Caps Lock modifier.
  40   void SetCapsLockEnabled(bool enabled);
  41   bool IsCapsLockEnabled();
  42
  43   // Configuration for key repeat.
  44   bool IsAutoRepeatEnabled();
  45   void SetAutoRepeatEnabled(bool enabled);
  46   void SetAutoRepeatRate(const base::TimeDelta& delay,
  47                          const base::TimeDelta& interval);
  48   void GetAutoRepeatRate(base::TimeDelta* delay, base::TimeDelta* interval);
  49
  50  private:
  51   void UpdateModifier(int modifier_flag, bool down);
  52   void UpdateCapsLockLed();
  53   void UpdateKeyRepeat(unsigned int key, bool down);
  54   void StartKeyRepeat(unsigned int key);
  55   void StopKeyRepeat();
  56   void ScheduleKeyRepeat(const base::TimeDelta& delay);
  57   void OnRepeatTimeout(unsigned int sequence);
  58   void DispatchKey(unsigned int key,
  59                    bool down,
  60                    bool repeat,
  61                    base::TimeDelta timestamp);
  62
  63   // Aggregated key state. There is only one bit of state per key; we do not
  64   // attempt to count presses of the same key on multiple keyboards.
  65   //
  66   // A key is down iff the most recent event pertaining to that key was a key
  67   // down event rather than a key up event. Therefore, a particular key position
  68   // can be considered released even if it is being depresssed on one or more
  69   // keyboards.
  70   std::bitset<KEY_CNT> key_state_;
  71
  72   // Callback for dispatching events.
  73   EventDispatchCallback callback_;
  74
  75   // Shared modifier state.
  76   EventModifiersEvdev* modifiers_;
  77
  78   // Shared layout engine.
  79   KeyboardLayoutEngine* keyboard_layout_engine_;
  80
  81   // Key repeat state.
  82   bool repeat_enabled_;
  83   unsigned int repeat_key_;
  84   unsigned int repeat_sequence_;
  85   base::TimeDelta repeat_delay_;
  86   base::TimeDelta repeat_interval_;
  87
  88   base::WeakPtrFactory<KeyboardEvdev> weak_ptr_factory_;
  89
  90   DISALLOW_COPY_AND_ASSIGN(KeyboardEvdev);
  91 };
  92
  93 }  // namespace ui
  94
  95 #endif  // UI_EVENTS_OZONE_EVDEV_KEYBOARD_EVDEV_H_