Handle X11 Mod3Mask for Caps Lock remapping.

chrome/browser/chromeos/events/event_rewriter.cc

 // 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.
 
 #include "chrome/browser/chromeos/events/event_rewriter.h"
 
 #include <vector>
 
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
@@ skipping 50 matching lines @@
   ui::KeyboardCode key_code;
   const char* pref_name;
 } kModifierRemappings[] = {
       {input_method::kSearchKey, ui::EF_COMMAND_DOWN, ui::VKEY_LWIN,
        prefs::kLanguageRemapSearchKeyTo},
       {input_method::kControlKey, ui::EF_CONTROL_DOWN, ui::VKEY_CONTROL,
        prefs::kLanguageRemapControlKeyTo},
       {input_method::kAltKey, ui::EF_ALT_DOWN, ui::VKEY_MENU,
        prefs::kLanguageRemapAltKeyTo},
       {input_method::kVoidKey, 0, ui::VKEY_UNKNOWN, NULL},
-      {input_method::kCapsLockKey, ui::EF_CAPS_LOCK_DOWN, ui::VKEY_CAPITAL,
+      {input_method::kCapsLockKey, ui::EF_MOD3_DOWN, ui::VKEY_CAPITAL,
        prefs::kLanguageRemapCapsLockKeyTo},
       {input_method::kEscapeKey, 0, ui::VKEY_ESCAPE, NULL},
       {0, 0, ui::VKEY_F15, prefs::kLanguageRemapDiamondKeyTo},
 };
 
 const ModifierRemapping* kModifierRemappingCtrl = &kModifierRemappings[1];
 
 // Gets a remapped key for |pref_name| key. For example, to find out which
 // key Search is currently remapped to, call the function with
 // prefs::kLanguageRemapSearchKeyTo.
@@ skipping 236 matching lines @@
     if (!(unmodified_flags & kModifierRemappings[i].flag))
       continue;
     switch (kModifierRemappings[i].flag) {
       case ui::EF_COMMAND_DOWN:
         // Rewrite Command key presses on an Apple keyboard to Control.
         if (IsAppleKeyboard()) {
           DCHECK_EQ(ui::EF_CONTROL_DOWN, kModifierRemappingCtrl->flag);
           remapped_key = kModifierRemappingCtrl;
         }
         break;
-      case ui::EF_CAPS_LOCK_DOWN:
-        // If CapsLock is used by the current input method, don't allow the
-        // CapsLock pref to remap it, or the keyboard behavior will be broken.
+      case ui::EF_MOD3_DOWN:
+        // If EF_MOD3_DOWN is used by the current input method, leave it alone;
+        // it is not remappable.
         if (IsISOLevel5ShiftUsedByCurrentInputMethod())
           continue;
+        // Otherwise, Mod3Mask is set on X events when the Caps Lock key
+        // is down, but, if Caps Lock is remapped, CapsLock is NOT set,
+        // because pressing the key does not invoke caps lock. So, the
+        // kModifierRemappings[] table uses EF_MOD3_DOWN for the Caps
+        // Lock remapping.
         break;
       default:
         break;
     }
     if (!remapped_key && kModifierRemappings[i].pref_name) {
       remapped_key =
           GetRemappedKey(kModifierRemappings[i].pref_name, pref_service);
     }
     if (remapped_key) {
       unmodified_flags &= ~kModifierRemappings[i].flag;
@@ skipping 409 matching lines @@
 
   XIFreeDeviceInfo(device_info);
 }
 
 void EventRewriter::DeviceRemoved(int device_id) {
   device_id_to_type_.erase(device_id);
 }
 #endif
 
 }  // namespace chromeos