src/chrome/browser/chromeos/preferences.cc

   1 // Copyright (c) 2012 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 #include "chrome/browser/chromeos/preferences.h"
   6
   7 #include <vector>
   8
   9 #include "ash/autoclick/autoclick_controller.h"
  10 #include "ash/magnifier/magnifier_constants.h"
  11 #include "ash/shell.h"
  12 #include "base/command_line.h"
  13 #include "base/i18n/time_formatting.h"
  14 #include "base/metrics/histogram.h"
  15 #include "base/prefs/pref_member.h"
  16 #include "base/prefs/pref_registry_simple.h"
  17 #include "base/prefs/scoped_user_pref_update.h"
  18 #include "base/strings/string_split.h"
  19 #include "base/strings/string_util.h"
  20 #include "base/strings/utf_string_conversions.h"
  21 #include "base/sys_info.h"
  22 #include "chrome/browser/browser_process.h"
  23 #include "chrome/browser/chrome_notification_types.h"
  24 #include "chrome/browser/chromeos/accessibility/magnification_manager.h"
  25 #include "chrome/browser/chromeos/drive/file_system_util.h"
  26 #include "chrome/browser/chromeos/input_method/input_method_util.h"
  27 #include "chrome/browser/chromeos/login/login_utils.h"
  28 #include "chrome/browser/chromeos/login/user.h"
  29 #include "chrome/browser/chromeos/system/input_device_settings.h"
  30 #include "chrome/browser/download/download_prefs.h"
  31 #include "chrome/browser/prefs/pref_service_syncable.h"
  32 #include "chrome/common/chrome_switches.h"
  33 #include "chrome/common/pref_names.h"
  34 #include "chromeos/chromeos_switches.h"
  35 #include "chromeos/ime/extension_ime_util.h"
  36 #include "chromeos/ime/ime_keyboard.h"
  37 #include "chromeos/ime/input_method_manager.h"
  38 #include "chromeos/system/statistics_provider.h"
  39 #include "components/feedback/tracing_manager.h"
  40 #include "components/user_prefs/pref_registry_syncable.h"
  41 #include "third_party/icu/source/i18n/unicode/timezone.h"
  42 #include "ui/events/event_constants.h"
  43 #include "ui/events/event_utils.h"
  44 #include "url/gurl.h"
  45
  46 namespace chromeos {
  47
  48 static const char kFallbackInputMethodLocale[] = "en-US";
  49
  50 Preferences::Preferences()
  51     : prefs_(NULL),
  52       input_method_manager_(input_method::InputMethodManager::Get()),
  53       user_(NULL),
  54       user_is_primary_(false) {
  55   // Do not observe shell, if there is no shell instance; e.g., in some unit
  56   // tests.
  57   if (ash::Shell::HasInstance())
  58     ash::Shell::GetInstance()->AddShellObserver(this);
  59 }
  60
  61 Preferences::Preferences(input_method::InputMethodManager* input_method_manager)
  62     : prefs_(NULL),
  63       input_method_manager_(input_method_manager),
  64       user_(NULL),
  65       user_is_primary_(false) {
  66   // Do not observe shell, if there is no shell instance; e.g., in some unit
  67   // tests.
  68   if (ash::Shell::HasInstance())
  69     ash::Shell::GetInstance()->AddShellObserver(this);
  70 }
  71
  72 Preferences::~Preferences() {
  73   prefs_->RemoveObserver(this);
  74   UserManager::Get()->RemoveSessionStateObserver(this);
  75   // If shell instance is destoryed before this preferences instance, there is
  76   // no need to remove this shell observer.
  77   if (ash::Shell::HasInstance())
  78     ash::Shell::GetInstance()->RemoveShellObserver(this);
  79 }
  80
  81 // static
  82 void Preferences::RegisterPrefs(PrefRegistrySimple* registry) {
  83   registry->RegisterBooleanPref(prefs::kOwnerPrimaryMouseButtonRight, false);
  84   registry->RegisterBooleanPref(prefs::kOwnerTapToClickEnabled, true);
  85   registry->RegisterBooleanPref(prefs::kVirtualKeyboardEnabled, false);
  86 }
  87
  88 // static
  89 void Preferences::RegisterProfilePrefs(
  90     user_prefs::PrefRegistrySyncable* registry) {
  91   std::string hardware_keyboard_id;
  92   // TODO(yusukes): Remove the runtime hack.
  93   if (base::SysInfo::IsRunningOnChromeOS()) {
  94     DCHECK(g_browser_process);
  95     PrefService* local_state = g_browser_process->local_state();
  96     DCHECK(local_state);
  97     hardware_keyboard_id =
  98         local_state->GetString(prefs::kHardwareKeyboardLayout);
  99   } else {
 100     hardware_keyboard_id = "xkb:us::eng";  // only for testing.
 101   }
 102
 103   registry->RegisterBooleanPref(
 104       prefs::kPerformanceTracingEnabled,
 105       false,
 106       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 107
 108   registry->RegisterBooleanPref(
 109       prefs::kTapToClickEnabled,
 110       true,
 111       user_prefs::PrefRegistrySyncable::SYNCABLE_PRIORITY_PREF);
 112   registry->RegisterBooleanPref(
 113       prefs::kTapDraggingEnabled,
 114       false,
 115       user_prefs::PrefRegistrySyncable::SYNCABLE_PRIORITY_PREF);
 116   registry->RegisterBooleanPref(
 117       prefs::kEnableTouchpadThreeFingerClick,
 118       false,
 119       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 120   registry->RegisterBooleanPref(
 121       prefs::kNaturalScroll,
 122       CommandLine::ForCurrentProcess()->HasSwitch(
 123           switches::kNaturalScrollDefault),
 124       user_prefs::PrefRegistrySyncable::SYNCABLE_PRIORITY_PREF);
 125   registry->RegisterBooleanPref(
 126       prefs::kPrimaryMouseButtonRight,
 127       false,
 128       user_prefs::PrefRegistrySyncable::SYNCABLE_PRIORITY_PREF);
 129   registry->RegisterBooleanPref(
 130       prefs::kLabsMediaplayerEnabled,
 131       false,
 132       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 133   registry->RegisterBooleanPref(
 134       prefs::kLabsAdvancedFilesystemEnabled,
 135       false,
 136       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 137   registry->RegisterBooleanPref(
 138       prefs::kStickyKeysEnabled,
 139       false,
 140       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 141   registry->RegisterBooleanPref(
 142       prefs::kLargeCursorEnabled,
 143       false,
 144       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 145   registry->RegisterBooleanPref(
 146       prefs::kSpokenFeedbackEnabled,
 147       false,
 148       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 149   registry->RegisterBooleanPref(
 150       prefs::kHighContrastEnabled,
 151       false,
 152       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 153   registry->RegisterBooleanPref(
 154       prefs::kScreenMagnifierEnabled,
 155       false,
 156       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 157   registry->RegisterIntegerPref(
 158       prefs::kScreenMagnifierType,
 159       ash::kDefaultMagnifierType,
 160       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 161   registry->RegisterDoublePref(
 162       prefs::kScreenMagnifierScale,
 163       std::numeric_limits<double>::min(),
 164       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 165   registry->RegisterBooleanPref(
 166       prefs::kAutoclickEnabled,
 167       false,
 168       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 169   registry->RegisterIntegerPref(
 170       prefs::kAutoclickDelayMs,
 171       ash::AutoclickController::kDefaultAutoclickDelayMs,
 172       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 173   registry->RegisterBooleanPref(
 174     prefs::kVirtualKeyboardEnabled,
 175     false,
 176     user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 177   registry->RegisterBooleanPref(
 178       prefs::kShouldAlwaysShowAccessibilityMenu,
 179       false,
 180       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 181   registry->RegisterIntegerPref(
 182       prefs::kMouseSensitivity,
 183       3,
 184       user_prefs::PrefRegistrySyncable::SYNCABLE_PRIORITY_PREF);
 185   registry->RegisterIntegerPref(
 186       prefs::kTouchpadSensitivity,
 187       3,
 188       user_prefs::PrefRegistrySyncable::SYNCABLE_PRIORITY_PREF);
 189   registry->RegisterBooleanPref(
 190       prefs::kUse24HourClock,
 191       base::GetHourClockType() == base::k24HourClock,
 192       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 193   registry->RegisterBooleanPref(
 194       prefs::kDisableDrive,
 195       false,
 196       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 197   registry->RegisterBooleanPref(
 198       prefs::kDisableDriveOverCellular,
 199       true,
 200       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 201   registry->RegisterBooleanPref(
 202       prefs::kDisableDriveHostedFiles,
 203       false,
 204       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 205   // We don't sync prefs::kLanguageCurrentInputMethod and PreviousInputMethod
 206   // because they're just used to track the logout state of the device.
 207   registry->RegisterStringPref(
 208       prefs::kLanguageCurrentInputMethod,
 209       "",
 210       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 211   registry->RegisterStringPref(
 212       prefs::kLanguagePreviousInputMethod,
 213       "",
 214       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 215   // We don't sync the list of input methods and preferred languages since a
 216   // user might use two or more devices with different hardware keyboards.
 217   // crosbug.com/15181
 218   registry->RegisterStringPref(
 219       prefs::kLanguagePreferredLanguages,
 220       kFallbackInputMethodLocale,
 221       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 222   registry->RegisterStringPref(
 223       prefs::kLanguagePreloadEngines,
 224       hardware_keyboard_id,
 225       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 226   registry->RegisterStringPref(
 227       prefs::kLanguageEnabledExtensionImes,
 228       "",
 229       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 230
 231   registry->RegisterIntegerPref(
 232       prefs::kLanguageRemapSearchKeyTo,
 233       input_method::kSearchKey,
 234       user_prefs::PrefRegistrySyncable::SYNCABLE_PRIORITY_PREF);
 235   registry->RegisterIntegerPref(
 236       prefs::kLanguageRemapControlKeyTo,
 237       input_method::kControlKey,
 238       user_prefs::PrefRegistrySyncable::SYNCABLE_PRIORITY_PREF);
 239   registry->RegisterIntegerPref(
 240       prefs::kLanguageRemapAltKeyTo,
 241       input_method::kAltKey,
 242       user_prefs::PrefRegistrySyncable::SYNCABLE_PRIORITY_PREF);
 243   // We don't sync the CapsLock remapping pref, since the UI hides this pref
 244   // on certain devices, so syncing a non-default value to a device that
 245   // doesn't allow changing the pref would be odd. http://crbug.com/167237
 246   registry->RegisterIntegerPref(
 247       prefs::kLanguageRemapCapsLockKeyTo,
 248       input_method::kCapsLockKey,
 249       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 250   registry->RegisterIntegerPref(
 251       prefs::kLanguageRemapDiamondKeyTo,
 252       input_method::kControlKey,
 253       user_prefs::PrefRegistrySyncable::SYNCABLE_PRIORITY_PREF);
 254   // The following pref isn't synced since the user may desire a different value
 255   // depending on whether an external keyboard is attached to a particular
 256   // device.
 257   registry->RegisterBooleanPref(
 258       prefs::kLanguageSendFunctionKeys,
 259       false,
 260       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 261   // We don't sync the following keyboard prefs since they are not user-
 262   // configurable.
 263   registry->RegisterBooleanPref(
 264       prefs::kLanguageXkbAutoRepeatEnabled,
 265       true,
 266       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 267   registry->RegisterIntegerPref(
 268       prefs::kLanguageXkbAutoRepeatDelay,
 269       language_prefs::kXkbAutoRepeatDelayInMs,
 270       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 271   registry->RegisterIntegerPref(
 272       prefs::kLanguageXkbAutoRepeatInterval,
 273       language_prefs::kXkbAutoRepeatIntervalInMs,
 274       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 275
 276   // Mobile plan notifications default to on.
 277   registry->RegisterBooleanPref(
 278       prefs::kShowPlanNotifications,
 279       true,
 280       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 281
 282   // 3G first-time usage promo will be shown at least once.
 283   registry->RegisterBooleanPref(
 284       prefs::kShow3gPromoNotification,
 285       true,
 286       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 287
 288   // Initially all existing users would see "What's new" for current version
 289   // after update.
 290   registry->RegisterStringPref(prefs::kChromeOSReleaseNotesVersion,
 291                                "0.0.0.0",
 292                                user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 293
 294   registry->RegisterBooleanPref(
 295       prefs::kExternalStorageDisabled,
 296       false,
 297       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 298
 299   registry->RegisterStringPref(
 300       prefs::kTermsOfServiceURL,
 301       "",
 302       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 303
 304   registry->RegisterBooleanPref(
 305       prefs::kTouchHudProjectionEnabled,
 306       false,
 307       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 308 }
 309
 310 void Preferences::InitUserPrefs(PrefServiceSyncable* prefs) {
 311   prefs_ = prefs;
 312
 313   BooleanPrefMember::NamedChangeCallback callback =
 314       base::Bind(&Preferences::OnPreferenceChanged, base::Unretained(this));
 315
 316   performance_tracing_enabled_.Init(prefs::kPerformanceTracingEnabled,
 317                                     prefs, callback);
 318   tap_to_click_enabled_.Init(prefs::kTapToClickEnabled, prefs, callback);
 319   tap_dragging_enabled_.Init(prefs::kTapDraggingEnabled, prefs, callback);
 320   three_finger_click_enabled_.Init(prefs::kEnableTouchpadThreeFingerClick,
 321       prefs, callback);
 322   natural_scroll_.Init(prefs::kNaturalScroll, prefs, callback);
 323   mouse_sensitivity_.Init(prefs::kMouseSensitivity, prefs, callback);
 324   touchpad_sensitivity_.Init(prefs::kTouchpadSensitivity, prefs, callback);
 325   primary_mouse_button_right_.Init(prefs::kPrimaryMouseButtonRight,
 326                                    prefs, callback);
 327   download_default_directory_.Init(prefs::kDownloadDefaultDirectory,
 328                                    prefs, callback);
 329   touch_hud_projection_enabled_.Init(prefs::kTouchHudProjectionEnabled,
 330                                      prefs, callback);
 331   preload_engines_.Init(prefs::kLanguagePreloadEngines, prefs, callback);
 332   enabled_extension_imes_.Init(prefs::kLanguageEnabledExtensionImes,
 333                                prefs, callback);
 334   current_input_method_.Init(prefs::kLanguageCurrentInputMethod,
 335                              prefs, callback);
 336   previous_input_method_.Init(prefs::kLanguagePreviousInputMethod,
 337                               prefs, callback);
 338
 339   xkb_auto_repeat_enabled_.Init(
 340       prefs::kLanguageXkbAutoRepeatEnabled, prefs, callback);
 341   xkb_auto_repeat_delay_pref_.Init(
 342       prefs::kLanguageXkbAutoRepeatDelay, prefs, callback);
 343   xkb_auto_repeat_interval_pref_.Init(
 344       prefs::kLanguageXkbAutoRepeatInterval, prefs, callback);
 345 }
 346
 347 void Preferences::Init(PrefServiceSyncable* prefs, const User* user) {
 348   DCHECK(user);
 349   user_ = user;
 350   user_is_primary_ = UserManager::Get()->GetPrimaryUser() == user_;
 351   InitUserPrefs(prefs);
 352
 353   UserManager::Get()->AddSessionStateObserver(this);
 354
 355   // This causes OnIsSyncingChanged to be called when the value of
 356   // PrefService::IsSyncing() changes.
 357   prefs->AddObserver(this);
 358
 359   // Initialize preferences to currently saved state.
 360   ApplyPreferences(REASON_INITIALIZATION, "");
 361
 362   // If a guest is logged in, initialize the prefs as if this is the first
 363   // login.
 364   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kGuestSession)) {
 365     LoginUtils::Get()->SetFirstLoginPrefs(prefs);
 366   }
 367 }
 368
 369 void Preferences::InitUserPrefsForTesting(PrefServiceSyncable* prefs,
 370                                           const User* user) {
 371   user_ = user;
 372   InitUserPrefs(prefs);
 373 }
 374
 375 void Preferences::SetInputMethodListForTesting() {
 376   SetInputMethodList();
 377 }
 378
 379 void Preferences::OnPreferenceChanged(const std::string& pref_name) {
 380   ApplyPreferences(REASON_PREF_CHANGED, pref_name);
 381 }
 382
 383 void Preferences::ApplyPreferences(ApplyReason reason,
 384                                    const std::string& pref_name) {
 385   DCHECK(reason != REASON_PREF_CHANGED || !pref_name.empty());
 386   const bool user_is_owner =
 387       UserManager::Get()->GetOwnerEmail() == user_->email();
 388   const bool user_is_active = user_->is_active();
 389
 390   system::TouchpadSettings touchpad_settings;
 391   system::MouseSettings mouse_settings;
 392
 393   if (user_is_primary_ && (reason == REASON_INITIALIZATION ||
 394                            pref_name == prefs::kPerformanceTracingEnabled)) {
 395     const bool enabled = performance_tracing_enabled_.GetValue();
 396     if (enabled)
 397       tracing_manager_ = TracingManager::Create();
 398     else
 399       tracing_manager_.reset();
 400   }
 401   if (reason != REASON_PREF_CHANGED || pref_name == prefs::kTapToClickEnabled) {
 402     const bool enabled = tap_to_click_enabled_.GetValue();
 403     if (user_is_active)
 404       touchpad_settings.SetTapToClick(enabled);
 405     if (reason == REASON_PREF_CHANGED)
 406       UMA_HISTOGRAM_BOOLEAN("Touchpad.TapToClick.Changed", enabled);
 407     else if (reason == REASON_INITIALIZATION)
 408       UMA_HISTOGRAM_BOOLEAN("Touchpad.TapToClick.Started", enabled);
 409
 410     // Save owner preference in local state to use on login screen.
 411     if (user_is_owner) {
 412       PrefService* prefs = g_browser_process->local_state();
 413       if (prefs->GetBoolean(prefs::kOwnerTapToClickEnabled) != enabled)
 414         prefs->SetBoolean(prefs::kOwnerTapToClickEnabled, enabled);
 415     }
 416   }
 417   if (reason != REASON_PREF_CHANGED ||
 418       pref_name == prefs::kTapDraggingEnabled) {
 419     const bool enabled = tap_dragging_enabled_.GetValue();
 420     if (user_is_active)
 421       touchpad_settings.SetTapDragging(enabled);
 422     if (reason == REASON_PREF_CHANGED)
 423       UMA_HISTOGRAM_BOOLEAN("Touchpad.TapDragging.Changed", enabled);
 424     else if (reason == REASON_INITIALIZATION)
 425       UMA_HISTOGRAM_BOOLEAN("Touchpad.TapDragging.Started", enabled);
 426   }
 427   if (reason != REASON_PREF_CHANGED ||
 428       pref_name == prefs::kEnableTouchpadThreeFingerClick) {
 429     const bool enabled = three_finger_click_enabled_.GetValue();
 430     if (user_is_active)
 431       touchpad_settings.SetThreeFingerClick(enabled);
 432     if (reason == REASON_PREF_CHANGED)
 433       UMA_HISTOGRAM_BOOLEAN("Touchpad.ThreeFingerClick.Changed", enabled);
 434     else if (reason == REASON_INITIALIZATION)
 435       UMA_HISTOGRAM_BOOLEAN("Touchpad.ThreeFingerClick.Started", enabled);
 436   }
 437   if (reason != REASON_PREF_CHANGED || pref_name == prefs::kNaturalScroll) {
 438     // Force natural scroll default if we've sync'd and if the cmd line arg is
 439     // set.
 440     ForceNaturalScrollDefault();
 441
 442     const bool enabled = natural_scroll_.GetValue();
 443     DVLOG(1) << "Natural scroll set to " << enabled;
 444     if (user_is_active)
 445       touchpad_settings.SetNaturalScroll(enabled);
 446     if (reason == REASON_PREF_CHANGED)
 447       UMA_HISTOGRAM_BOOLEAN("Touchpad.NaturalScroll.Changed", enabled);
 448     else if (reason == REASON_INITIALIZATION)
 449       UMA_HISTOGRAM_BOOLEAN("Touchpad.NaturalScroll.Started", enabled);
 450   }
 451   if (reason != REASON_PREF_CHANGED || pref_name == prefs::kMouseSensitivity) {
 452     const int sensitivity = mouse_sensitivity_.GetValue();
 453     if (user_is_active)
 454       mouse_settings.SetSensitivity(sensitivity);
 455     if (reason == REASON_PREF_CHANGED) {
 456       UMA_HISTOGRAM_ENUMERATION("Mouse.PointerSensitivity.Changed",
 457                                 sensitivity,
 458                                 system::kMaxPointerSensitivity + 1);
 459     } else if (reason == REASON_INITIALIZATION) {
 460       UMA_HISTOGRAM_ENUMERATION("Mouse.PointerSensitivity.Started",
 461                                 sensitivity,
 462                                 system::kMaxPointerSensitivity + 1);
 463     }
 464   }
 465   if (reason != REASON_PREF_CHANGED ||
 466       pref_name == prefs::kTouchpadSensitivity) {
 467     const int sensitivity = touchpad_sensitivity_.GetValue();
 468     if (user_is_active)
 469       touchpad_settings.SetSensitivity(sensitivity);
 470     if (reason == REASON_PREF_CHANGED) {
 471       UMA_HISTOGRAM_ENUMERATION("Touchpad.PointerSensitivity.Changed",
 472                                 sensitivity,
 473                                 system::kMaxPointerSensitivity + 1);
 474     } else if (reason == REASON_INITIALIZATION) {
 475       UMA_HISTOGRAM_ENUMERATION("Touchpad.PointerSensitivity.Started",
 476                                 sensitivity,
 477                                 system::kMaxPointerSensitivity + 1);
 478     }
 479   }
 480   if (reason != REASON_PREF_CHANGED ||
 481       pref_name == prefs::kPrimaryMouseButtonRight) {
 482     const bool right = primary_mouse_button_right_.GetValue();
 483     if (user_is_active)
 484       mouse_settings.SetPrimaryButtonRight(right);
 485     if (reason == REASON_PREF_CHANGED)
 486       UMA_HISTOGRAM_BOOLEAN("Mouse.PrimaryButtonRight.Changed", right);
 487     else if (reason == REASON_INITIALIZATION)
 488       UMA_HISTOGRAM_BOOLEAN("Mouse.PrimaryButtonRight.Started", right);
 489     // Save owner preference in local state to use on login screen.
 490     if (user_is_owner) {
 491       PrefService* prefs = g_browser_process->local_state();
 492       if (prefs->GetBoolean(prefs::kOwnerPrimaryMouseButtonRight) != right)
 493         prefs->SetBoolean(prefs::kOwnerPrimaryMouseButtonRight, right);
 494     }
 495   }
 496   if (reason != REASON_PREF_CHANGED ||
 497       pref_name == prefs::kDownloadDefaultDirectory) {
 498     const bool default_download_to_drive = drive::util::IsUnderDriveMountPoint(
 499         download_default_directory_.GetValue());
 500     if (reason == REASON_PREF_CHANGED)
 501       UMA_HISTOGRAM_BOOLEAN(
 502           "FileBrowser.DownloadDestination.IsGoogleDrive.Changed",
 503           default_download_to_drive);
 504     else if (reason == REASON_INITIALIZATION)
 505       UMA_HISTOGRAM_BOOLEAN(
 506           "FileBrowser.DownloadDestination.IsGoogleDrive.Started",
 507           default_download_to_drive);
 508   }
 509   if (reason != REASON_PREF_CHANGED ||
 510       pref_name == prefs::kTouchHudProjectionEnabled) {
 511     if (user_is_active) {
 512       const bool enabled = touch_hud_projection_enabled_.GetValue();
 513       ash::Shell::GetInstance()->SetTouchHudProjectionEnabled(enabled);
 514     }
 515   }
 516
 517   if (reason != REASON_PREF_CHANGED ||
 518       pref_name == prefs::kLanguageXkbAutoRepeatEnabled) {
 519     if (user_is_active) {
 520       const bool enabled = xkb_auto_repeat_enabled_.GetValue();
 521       input_method::InputMethodManager::Get()
 522           ->GetImeKeyboard()
 523           ->SetAutoRepeatEnabled(enabled);
 524     }
 525   }
 526   if (reason != REASON_PREF_CHANGED ||
 527       pref_name == prefs::kLanguageXkbAutoRepeatDelay ||
 528       pref_name == prefs::kLanguageXkbAutoRepeatInterval) {
 529     if (user_is_active)
 530       UpdateAutoRepeatRate();
 531   }
 532
 533   if (reason != REASON_PREF_CHANGED && user_is_active) {
 534     SetInputMethodList();
 535   } else if (pref_name == prefs::kLanguagePreloadEngines && user_is_active) {
 536     SetLanguageConfigStringListAsCSV(language_prefs::kGeneralSectionName,
 537                                      language_prefs::kPreloadEnginesConfigName,
 538                                      preload_engines_.GetValue());
 539   }
 540
 541   if (reason != REASON_PREF_CHANGED ||
 542       pref_name == prefs::kLanguageEnabledExtensionImes) {
 543     if (user_is_active) {
 544       std::string value(enabled_extension_imes_.GetValue());
 545
 546       std::vector<std::string> split_values;
 547       if (!value.empty())
 548         base::SplitString(value, ',', &split_values);
 549
 550       input_method_manager_->SetEnabledExtensionImes(&split_values);
 551     }
 552   }
 553
 554   if (user_is_active) {
 555     system::InputDeviceSettings::Get()->UpdateTouchpadSettings(
 556         touchpad_settings);
 557     system::InputDeviceSettings::Get()->UpdateMouseSettings(mouse_settings);
 558   }
 559 }
 560
 561 void Preferences::OnIsSyncingChanged() {
 562   DVLOG(1) << "OnIsSyncingChanged";
 563   ForceNaturalScrollDefault();
 564 }
 565
 566 void Preferences::ForceNaturalScrollDefault() {
 567   DVLOG(1) << "ForceNaturalScrollDefault";
 568   if (CommandLine::ForCurrentProcess()->HasSwitch(
 569           switches::kNaturalScrollDefault) &&
 570       prefs_->IsSyncing() &&
 571       !prefs_->GetUserPrefValue(prefs::kNaturalScroll)) {
 572     DVLOG(1) << "Natural scroll forced to true";
 573     natural_scroll_.SetValue(true);
 574     UMA_HISTOGRAM_BOOLEAN("Touchpad.NaturalScroll.Forced", true);
 575   }
 576 }
 577
 578 void Preferences::SetLanguageConfigStringListAsCSV(const char* section,
 579                                                    const char* name,
 580                                                    const std::string& value) {
 581   VLOG(1) << "Setting " << name << " to '" << value << "'";
 582
 583   std::vector<std::string> split_values;
 584   if (!value.empty())
 585     base::SplitString(value, ',', &split_values);
 586
 587   // TODO(shuchen): migration of the xkb id to extension-xkb id.
 588   // Remove this function after few milestones are passed.
 589   // See: http://crbug.com/345604
 590   if (input_method_manager_->MigrateXkbInputMethods(&split_values))
 591     preload_engines_.SetValue(JoinString(split_values, ','));
 592
 593   if (section == std::string(language_prefs::kGeneralSectionName) &&
 594       name == std::string(language_prefs::kPreloadEnginesConfigName)) {
 595     input_method_manager_->ReplaceEnabledInputMethods(split_values);
 596     return;
 597   }
 598 }
 599
 600 void Preferences::SetInputMethodList() {
 601   // When |preload_engines_| are set, InputMethodManager::ChangeInputMethod()
 602   // might be called to change the current input method to the first one in the
 603   // |preload_engines_| list. This also updates previous/current input method
 604   // prefs. That's why GetValue() calls are placed before the
 605   // SetLanguageConfigStringListAsCSV() call below.
 606   const std::string previous_input_method_id =
 607       previous_input_method_.GetValue();
 608   const std::string current_input_method_id = current_input_method_.GetValue();
 609   SetLanguageConfigStringListAsCSV(language_prefs::kGeneralSectionName,
 610                                    language_prefs::kPreloadEnginesConfigName,
 611                                    preload_engines_.GetValue());
 612
 613   // ChangeInputMethod() has to be called AFTER the value of |preload_engines_|
 614   // is sent to the InputMethodManager. Otherwise, the ChangeInputMethod request
 615   // might be ignored as an invalid input method ID. The ChangeInputMethod()
 616   // calls are also necessary to restore the previous/current input method prefs
 617   // which could have been modified by the SetLanguageConfigStringListAsCSV call
 618   // above to the original state.
 619   if (!previous_input_method_id.empty())
 620     input_method_manager_->ChangeInputMethod(previous_input_method_id);
 621   if (!current_input_method_id.empty())
 622     input_method_manager_->ChangeInputMethod(current_input_method_id);
 623 }
 624
 625 void Preferences::UpdateAutoRepeatRate() {
 626   input_method::AutoRepeatRate rate;
 627   rate.initial_delay_in_ms = xkb_auto_repeat_delay_pref_.GetValue();
 628   rate.repeat_interval_in_ms = xkb_auto_repeat_interval_pref_.GetValue();
 629   DCHECK(rate.initial_delay_in_ms > 0);
 630   DCHECK(rate.repeat_interval_in_ms > 0);
 631   input_method::InputMethodManager::Get()
 632       ->GetImeKeyboard()
 633       ->SetAutoRepeatRate(rate);
 634 }
 635
 636 void Preferences::OnTouchHudProjectionToggled(bool enabled) {
 637   if (touch_hud_projection_enabled_.GetValue() == enabled)
 638     return;
 639   if (!user_->is_active())
 640     return;
 641   touch_hud_projection_enabled_.SetValue(enabled);
 642 }
 643
 644 void Preferences::ActiveUserChanged(const User* active_user) {
 645   if (active_user != user_)
 646     return;
 647   ApplyPreferences(REASON_ACTIVE_USER_CHANGED, "");
 648 }
 649
 650 }  // namespace chromeos