It is time.

ui/events/ozone/evdev/event_modifiers_evdev.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef UI_EVENTS_OZONE_EVDEV_EVENT_MODIFIERS_EVDEV_H_
-#define UI_EVENTS_OZONE_EVDEV_EVENT_MODIFIERS_EVDEV_H_
-
-#include "base/basictypes.h"
-#include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
-
-namespace ui {
-
-enum {
-  EVDEV_MODIFIER_NONE,
-  EVDEV_MODIFIER_CAPS_LOCK,
-  EVDEV_MODIFIER_SHIFT,
-  EVDEV_MODIFIER_CONTROL,
-  EVDEV_MODIFIER_ALT,
-  EVDEV_MODIFIER_LEFT_MOUSE_BUTTON,
-  EVDEV_MODIFIER_MIDDLE_MOUSE_BUTTON,
-  EVDEV_MODIFIER_RIGHT_MOUSE_BUTTON,
-  EVDEV_MODIFIER_COMMAND,
-  EVDEV_MODIFIER_ALTGR,
-  EVDEV_NUM_MODIFIERS
-};
-
-// Modifier key state for Evdev.
-//
-// Chrome relies on the underlying OS to interpret modifier keys such as Shift,
-// Ctrl, and Alt. The Linux input subsystem does not assign any special meaning
-// to these keys, so this work must happen at a higher layer (normally X11 or
-// the console driver). When using evdev directly, we must do it ourselves.
-//
-// The modifier state is shared between all input devices connected to the
-// system. This is to support actions such as Shift-Clicking that use multiple
-// devices.
-//
-// Normally a modifier is set if any of the keys or buttons assigned to it are
-// currently pressed. However some keys toggle a persistent "lock" for the
-// modifier instead, such as CapsLock. If a modifier is "locked" then its state
-// is inverted until it is unlocked.
-class EVENTS_OZONE_EVDEV_EXPORT EventModifiersEvdev {
- public:
-  EventModifiersEvdev();
-  ~EventModifiersEvdev();
-
-  // Record key press or release for regular modifier key (shift, alt, etc).
-  void UpdateModifier(unsigned int modifier, bool down);
-
-  // Record key press or release for locking modifier key (caps lock).
-  void UpdateModifierLock(unsigned int modifier, bool down);
-
-  // Return current flags to use for incoming events.
-  int GetModifierFlags();
-
-  // Return the mask for the specified modifier.
-  static int GetEventFlagFromModifier(unsigned int modifier);
-
- private:
-  // Count of keys pressed for each modifier.
-  int modifiers_down_[EVDEV_NUM_MODIFIERS];
-
-  // Mask of modifier flags currently "locked".
-  int modifier_flags_locked_;
-
-  // Mask of modifier flags currently active (nonzero keys pressed xor locked).
-  int modifier_flags_;
-
-  // Update modifier_flags_ from modifiers_down_ and modifier_flags_locked_.
-  void UpdateFlags(unsigned int modifier);
-
-  DISALLOW_COPY_AND_ASSIGN(EventModifiersEvdev);
-};
-
-}  // namspace ui
-
-#endif  // UI_EVENTS_OZONE_EVDEV_EVENT_MODIFIERS_EVDEV_H_