Reapply Caps Lock and Num Lock to core keyboard whenever new X input device is added

chrome/browser/chromeos/input_method/xkeyboard.h

 // Copyright (c) 2011 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 CHROME_BROWSER_CHROMEOS_INPUT_METHOD_XKEYBOARD_H_
 #define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_XKEYBOARD_H_
 #pragma once
 
 #include <queue>
 #include <set>
@@ skipping 50 matching lines @@
   // Remaps modifier keys. This function does not change the current keyboard
   // layout. Returns true on success. For now, you can't remap Left Control and
   // Left Alt keys to caps lock.
   bool RemapModifierKeys(const ModifierMap& modifier_map);
 
   // Sets the current keyboard layout again. We have to call the function every
   // time when "XI_HierarchyChanged" XInput2 event is sent to Chrome. See
   // xinput_hierarchy_changed_event_listener.h for details.
   bool ReapplyCurrentKeyboardLayout();
 
+  // Updates keyboard LEDs on all keyboards.
+  // XKB asymmetrically propagates keyboard modifier indicator state changes to
+  // slave keyboards. If the state change is initiated from a client to the
+  // "core/master keyboard", XKB changes global state and pushes an indication
+  // change down to all keyboards. If the state change is initiated by one slave
+  // (physical) keyboard, it changes global state but only pushes an indicator
+  // state change down to that one keyboard.
+  // This function changes LEDs on all keyboards by explicitly updating
+  // "core/master keyboard".
+  void ReapplyCurrentModifierLockStatus();
+
+  // Returns true if num lock is enabled. Do not call the function from non-UI
+  // threads.
+  static bool NumLockIsEnabled(unsigned int num_lock_mask);
+
+  // Sets the num lock status to |enable_num_lock|. Do not call the function
+  // from non-UI threads.
+  void SetNumLockEnabled(bool enable_num_lock);
+
+  // Returns true if caps lock is enabled. Do not call the function from non-UI
+  // threads.
+  static bool CapsLockIsEnabled();
+
+  // Sets the caps lock status to |enable_caps_lock|. Do not call the function
+  // from non-UI threads.
+  void SetCapsLockEnabled(bool enable_caps_lock);
+
   // Turns on and off the auto-repeat of the keyboard. Returns true on success.
   // Do not call the function from non-UI threads.
   static bool SetAutoRepeatEnabled(bool enabled);
 
   // Sets the auto-repeat rate of the keyboard, initial delay in ms, and repeat
   // interval in ms.  Returns true on success. Do not call the function from
   // non-UI threads.
   static bool SetAutoRepeatRate(const AutoRepeatRate& rate);
 
-  // Returns true if caps lock is enabled. Do not call the function from non-UI
-  // threads.
-  static bool CapsLockIsEnabled();
-
-  // Sets the caps lock status to |enable_caps_lock|. Do not call the function
-  // from non-UI threads.
-  static void SetCapsLockEnabled(bool enabled);
+  // Returns a mask (e.g. 1U<<4) for Num Lock. On error, returns 0.
+  static unsigned int GetNumLockMask();
 
  protected:
   // Creates a full XKB layout name like
   //   "gb(extd)+chromeos(leftcontrol_disabled_leftalt),us"
   // from modifier key mapping and |layout_name|, such as "us", "us(dvorak)",
   // and "gb(extd)". Returns an empty string on error. This function is
   // protected: for testability.
   std::string CreateFullXkbLayoutName(const std::string& layout_name,
                                       const ModifierMap& modifire_map);
 
@@ skipping 23 matching lines @@
   // KeepCapsLock("us(colemak)") would return true.
   bool KeepCapsLock(const std::string& xkb_layout_name) const;
 
   // Converts |key| to a modifier key name which is used in
   // /usr/share/X11/xkb/symbols/chromeos.
   static std::string ModifierKeyToString(ModifierKey key);
 
   // Called when execve'd setxkbmap process exits.
   static void OnSetLayoutFinish(pid_t pid, int status, XKeyboard* self);
 
+  const bool is_running_on_chrome_os_;
+  unsigned int num_lock_mask_;
+
+  // The current Num Lock and Caps Lock status. If true, enabled.
+  bool current_num_lock_status_;
+  bool current_caps_lock_status_;
   // The XKB layout name which we set last time like "us" and "us(dvorak)".
   std::string current_layout_name_;
   // The mapping of modifier keys we set last time.
   ModifierMap current_modifier_map_;
+
   // A queue for executing setxkbmap one by one.
   std::queue<std::string> execute_queue_;
 
   std::set<std::string> keep_right_alt_xkb_layout_names_;
   std::set<std::string> caps_lock_remapped_xkb_layout_names_;
 
-  const bool is_running_on_chrome_os_;
-
   DISALLOW_COPY_AND_ASSIGN(XKeyboard);
 };
 
 }  // namespace input_method
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_XKEYBOARD_H_