Add power-user keyboard mode for ChromeOS with Search key acting as a typical Fn key.

chrome/browser/chromeos/preferences.cc

 // Copyright (c) 2012 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/preferences.h"
 
 #include "base/chromeos/chromeos_version.h"
 #include "base/command_line.h"
 #include "base/i18n/time_formatting.h"
 #include "base/metrics/histogram.h"
@@ skipping 215 matching lines @@
                              PrefService::SYNCABLE_PREF);
   prefs->RegisterIntegerPref(prefs::kLanguageRemapControlKeyTo,
                              input_method::kControlKey,
                              PrefService::SYNCABLE_PREF);
   prefs->RegisterIntegerPref(prefs::kLanguageRemapAltKeyTo,
                              input_method::kAltKey,
                              PrefService::SYNCABLE_PREF);
   prefs->RegisterIntegerPref(prefs::kLanguageRemapCapsLockKeyTo,
                              input_method::kCapsLockKey,
                              PrefService::SYNCABLE_PREF);
+  prefs->RegisterBooleanPref(prefs::kLanguageSearchKeyActsAsFunctionKey,
+                             false,
+                             PrefService::SYNCABLE_PREF);
   // We don't sync the following keyboard prefs since they are not user-
   // configurable.
   prefs->RegisterBooleanPref(prefs::kLanguageXkbAutoRepeatEnabled,
                              true,
                              PrefService::UNSYNCABLE_PREF);
   prefs->RegisterIntegerPref(prefs::kLanguageXkbAutoRepeatDelay,
                              language_prefs::kXkbAutoRepeatDelayInMs,
                              PrefService::UNSYNCABLE_PREF);
   prefs->RegisterIntegerPref(prefs::kLanguageXkbAutoRepeatInterval,
                              language_prefs::kXkbAutoRepeatIntervalInMs,
@@ skipping 110 matching lines @@
         language_prefs::kMozcBooleanPrefs[i].pref_name, prefs, callback);
   }
   for (size_t i = 0; i < language_prefs::kNumMozcMultipleChoicePrefs; ++i) {
     mozc_multiple_choice_prefs_[i].Init(
         language_prefs::kMozcMultipleChoicePrefs[i].pref_name, prefs, callback);
   }
   for (size_t i = 0; i < language_prefs::kNumMozcIntegerPrefs; ++i) {
     mozc_integer_prefs_[i].Init(
         language_prefs::kMozcIntegerPrefs[i].pref_name, prefs, callback);
   }
+  search_key_acts_as_function_key_.Init(
+      prefs::kLanguageSearchKeyActsAsFunctionKey, prefs, callback);
   xkb_auto_repeat_enabled_.Init(
       prefs::kLanguageXkbAutoRepeatEnabled, prefs, callback);
   xkb_auto_repeat_delay_pref_.Init(
       prefs::kLanguageXkbAutoRepeatDelay, prefs, callback);
   xkb_auto_repeat_interval_pref_.Init(
       prefs::kLanguageXkbAutoRepeatInterval, prefs, callback);
 
   enable_screen_lock_.Init(prefs::kEnableScreenLock, prefs, callback);
 
   enable_drm_.Init(prefs::kEnableCrosDRM, prefs, callback);
@@ skipping 134 matching lines @@
       UMA_HISTOGRAM_BOOLEAN(
           "FileBrowser.DownloadDestination.IsGoogleDrive.Started",
           default_download_to_drive);
   }
 
   if (!pref_name || *pref_name == prefs::kLanguagePreferredLanguages) {
     // Unlike kLanguagePreloadEngines and some other input method
     // preferencs, we don't need to send this to ibus-daemon.
   }
 
+  if (!pref_name || *pref_name == prefs::kLanguageSearchKeyActsAsFunctionKey) {
+    const bool right = search_key_acts_as_function_key_.GetValue();
+    PrefService* prefs = g_browser_process->local_state();

[Yusuke Sato, 2012/11/26 06:09:38]

For consistency, I'd prefer not to reflect the owner pref to local_state because
Alt/Ctrl/Search remapping is always disabled on login screen.

[danakj, 2012/11/26 17:20:16]

Oh I had trouble with the setting being loaded correctly, and was just
copy/pasting other code. I'll try just removing this piece and see what happens
again.

[danakj, 2012/11/26 19:36:26]

Done.

+    if (prefs->GetBoolean(prefs::kLanguageSearchKeyActsAsFunctionKey) != right)
+      prefs->SetBoolean(prefs::kLanguageSearchKeyActsAsFunctionKey, right);
+  }
+
   if (!pref_name || *pref_name == prefs::kLanguageXkbAutoRepeatEnabled) {
     const bool enabled = xkb_auto_repeat_enabled_.GetValue();
     input_method::XKeyboard::SetAutoRepeatEnabled(enabled);
   }
   if (!pref_name || ((*pref_name == prefs::kLanguageXkbAutoRepeatDelay) ||
                      (*pref_name == prefs::kLanguageXkbAutoRepeatInterval))) {
     UpdateAutoRepeatRate();
   }
 
   if (!pref_name) {
@@ skipping 231 matching lines @@
 
   input_method::AutoRepeatRate rate;
   rate.initial_delay_in_ms = xkb_auto_repeat_delay_pref_.GetValue();
   rate.repeat_interval_in_ms = xkb_auto_repeat_interval_pref_.GetValue();
   DCHECK(rate.initial_delay_in_ms > 0);
   DCHECK(rate.repeat_interval_in_ms > 0);
   input_method::XKeyboard::SetAutoRepeatRate(rate);
 }
 
 }  // namespace chromeos