src/chrome/browser/chromeos/input_method/input_method_manager_impl.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/input_method/input_method_manager_impl.h"
   6
   7 #include <algorithm>  // std::find
   8
   9 #include "ash/ime/input_method_menu_item.h"
  10 #include "ash/ime/input_method_menu_manager.h"
  11 #include "base/basictypes.h"
  12 #include "base/bind.h"
  13 #include "base/location.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/prefs/pref_service.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/strings/stringprintf.h"
  18 #include "base/sys_info.h"
  19 #include "chrome/browser/browser_process.h"
  20 #include "chrome/browser/chromeos/input_method/candidate_window_controller.h"
  21 #include "chrome/browser/chromeos/input_method/component_extension_ime_manager_impl.h"
  22 #include "chrome/browser/chromeos/input_method/input_method_engine.h"
  23 #include "chrome/browser/chromeos/language_preferences.h"
  24 #include "chrome/browser/profiles/profile_manager.h"
  25 #include "chromeos/ime/component_extension_ime_manager.h"
  26 #include "chromeos/ime/extension_ime_util.h"
  27 #include "chromeos/ime/fake_ime_keyboard.h"
  28 #include "chromeos/ime/ime_keyboard.h"
  29 #include "chromeos/ime/input_method_delegate.h"
  30 #include "third_party/icu/source/common/unicode/uloc.h"
  31 #include "ui/base/accelerators/accelerator.h"
  32
  33 namespace chromeos {
  34 namespace input_method {
  35
  36 namespace {
  37
  38 const char nacl_mozc_jp_id[] =
  39     "_comp_ime_fpfbhcjppmaeaijcidgiibchfbnhbeljnacl_mozc_jp";
  40
  41 bool Contains(const std::vector<std::string>& container,
  42               const std::string& value) {
  43   return std::find(container.begin(), container.end(), value) !=
  44       container.end();
  45 }
  46
  47 }  // namespace
  48
  49 bool InputMethodManagerImpl::IsLoginKeyboard(
  50     const std::string& layout) const {
  51   return util_.IsLoginKeyboard(layout);
  52 }
  53
  54 bool InputMethodManagerImpl::MigrateXkbInputMethods(
  55     std::vector<std::string>* input_method_ids) {
  56   return util_.MigrateXkbInputMethods(input_method_ids);
  57 }
  58
  59 InputMethodManagerImpl::InputMethodManagerImpl(
  60     scoped_ptr<InputMethodDelegate> delegate)
  61     : delegate_(delegate.Pass()),
  62       state_(STATE_LOGIN_SCREEN),
  63       util_(delegate_.get(), GetSupportedInputMethods()),
  64       component_extension_ime_manager_(new ComponentExtensionIMEManager()),
  65       weak_ptr_factory_(this) {
  66 }
  67
  68 InputMethodManagerImpl::~InputMethodManagerImpl() {
  69   if (candidate_window_controller_.get())
  70     candidate_window_controller_->RemoveObserver(this);
  71 }
  72
  73 void InputMethodManagerImpl::AddObserver(
  74     InputMethodManager::Observer* observer) {
  75   observers_.AddObserver(observer);
  76 }
  77
  78 void InputMethodManagerImpl::AddCandidateWindowObserver(
  79     InputMethodManager::CandidateWindowObserver* observer) {
  80   candidate_window_observers_.AddObserver(observer);
  81 }
  82
  83 void InputMethodManagerImpl::RemoveObserver(
  84     InputMethodManager::Observer* observer) {
  85   observers_.RemoveObserver(observer);
  86 }
  87
  88 void InputMethodManagerImpl::RemoveCandidateWindowObserver(
  89     InputMethodManager::CandidateWindowObserver* observer) {
  90   candidate_window_observers_.RemoveObserver(observer);
  91 }
  92
  93 void InputMethodManagerImpl::SetState(State new_state) {
  94   const State old_state = state_;
  95   state_ = new_state;
  96   switch (state_) {
  97     case STATE_LOGIN_SCREEN:
  98       break;
  99     case STATE_BROWSER_SCREEN:
 100       if (old_state == STATE_LOCK_SCREEN)
 101         OnScreenUnlocked();
 102       break;
 103     case STATE_LOCK_SCREEN:
 104       OnScreenLocked();
 105       break;
 106     case STATE_TERMINATING: {
 107       if (candidate_window_controller_.get())
 108         candidate_window_controller_.reset();
 109       break;
 110     }
 111   }
 112 }
 113
 114 scoped_ptr<InputMethodDescriptors>
 115 InputMethodManagerImpl::GetSupportedInputMethods() const {
 116   scoped_ptr<InputMethodDescriptors> whitelist_imes =
 117       whitelist_.GetSupportedInputMethods();
 118   if (!extension_ime_util::UseWrappedExtensionKeyboardLayouts())
 119     return whitelist_imes.Pass();
 120   return scoped_ptr<InputMethodDescriptors>(new InputMethodDescriptors).Pass();
 121 }
 122
 123 scoped_ptr<InputMethodDescriptors>
 124 InputMethodManagerImpl::GetActiveInputMethods() const {
 125   scoped_ptr<InputMethodDescriptors> result(new InputMethodDescriptors);
 126   // Build the active input method descriptors from the active input
 127   // methods cache |active_input_method_ids_|.
 128   for (size_t i = 0; i < active_input_method_ids_.size(); ++i) {
 129     const std::string& input_method_id = active_input_method_ids_[i];
 130     const InputMethodDescriptor* descriptor =
 131         util_.GetInputMethodDescriptorFromId(input_method_id);
 132     if (descriptor) {
 133       result->push_back(*descriptor);
 134     } else {
 135       std::map<std::string, InputMethodDescriptor>::const_iterator ix =
 136           extra_input_methods_.find(input_method_id);
 137       if (ix != extra_input_methods_.end())
 138         result->push_back(ix->second);
 139       else
 140         DVLOG(1) << "Descriptor is not found for: " << input_method_id;
 141     }
 142   }
 143   if (result->empty()) {
 144     // Initially |active_input_method_ids_| is empty. browser_tests might take
 145     // this path.
 146     result->push_back(
 147         InputMethodUtil::GetFallbackInputMethodDescriptor());
 148   }
 149   return result.Pass();
 150 }
 151
 152 const std::vector<std::string>&
 153 InputMethodManagerImpl::GetActiveInputMethodIds() const {
 154   return active_input_method_ids_;
 155 }
 156
 157 size_t InputMethodManagerImpl::GetNumActiveInputMethods() const {
 158   return active_input_method_ids_.size();
 159 }
 160
 161 const InputMethodDescriptor* InputMethodManagerImpl::GetInputMethodFromId(
 162     const std::string& input_method_id) const {
 163   const InputMethodDescriptor* ime = util_.GetInputMethodDescriptorFromId(
 164       input_method_id);
 165   if (!ime) {
 166     std::map<std::string, InputMethodDescriptor>::const_iterator ix =
 167         extra_input_methods_.find(input_method_id);
 168     if (ix != extra_input_methods_.end())
 169       ime = &ix->second;
 170   }
 171   return ime;
 172 }
 173
 174 void InputMethodManagerImpl::EnableLoginLayouts(
 175     const std::string& language_code,
 176     const std::vector<std::string>& initial_layouts) {
 177   if (state_ == STATE_TERMINATING)
 178     return;
 179
 180   // First, hardware keyboard layout should be shown.
 181   std::vector<std::string> candidates =
 182       util_.GetHardwareLoginInputMethodIds();
 183
 184   // Seocnd, locale based input method should be shown.
 185   // Add input methods associated with the language.
 186   std::vector<std::string> layouts_from_locale;
 187   util_.GetInputMethodIdsFromLanguageCode(language_code,
 188                                           kKeyboardLayoutsOnly,
 189                                           &layouts_from_locale);
 190   candidates.insert(candidates.end(), layouts_from_locale.begin(),
 191                     layouts_from_locale.end());
 192
 193   std::vector<std::string> layouts;
 194   // First, add the initial input method ID, if it's requested, to
 195   // layouts, so it appears first on the list of active input
 196   // methods at the input language status menu.
 197   for (size_t i = 0; i < initial_layouts.size(); ++i) {
 198     if (util_.IsValidInputMethodId(initial_layouts[i])) {
 199       if (IsLoginKeyboard(initial_layouts[i])) {
 200         layouts.push_back(initial_layouts[i]);
 201       } else {
 202         DVLOG(1)
 203             << "EnableLoginLayouts: ignoring non-login initial keyboard layout:"
 204             << initial_layouts[i];
 205       }
 206     } else if (!initial_layouts[i].empty()) {
 207       DVLOG(1) << "EnableLoginLayouts: ignoring non-keyboard or invalid ID: "
 208                << initial_layouts[i];
 209     }
 210   }
 211
 212   // Add candidates to layouts, while skipping duplicates.
 213   for (size_t i = 0; i < candidates.size(); ++i) {
 214     const std::string& candidate = candidates[i];
 215     // Not efficient, but should be fine, as the two vectors are very
 216     // short (2-5 items).
 217     if (!Contains(layouts, candidate) && IsLoginKeyboard(candidate))
 218       layouts.push_back(candidate);
 219   }
 220
 221   MigrateXkbInputMethods(&layouts);
 222   active_input_method_ids_.swap(layouts);
 223
 224   // Initialize candidate window controller and widgets such as
 225   // candidate window, infolist and mode indicator.  Note, mode
 226   // indicator is used by only keyboard layout input methods.
 227   if (active_input_method_ids_.size() > 1)
 228     MaybeInitializeCandidateWindowController();
 229
 230   // you can pass empty |initial_layout|.
 231   ChangeInputMethod(initial_layouts.empty() ? "" :
 232       extension_ime_util::GetInputMethodIDByKeyboardLayout(
 233           initial_layouts[0]));
 234 }
 235
 236 // Adds new input method to given list.
 237 bool InputMethodManagerImpl::EnableInputMethodImpl(
 238     const std::string& input_method_id,
 239     std::vector<std::string>* new_active_input_method_ids) const {
 240   DCHECK(new_active_input_method_ids);
 241   if (!util_.IsValidInputMethodId(input_method_id)) {
 242     DVLOG(1) << "EnableInputMethod: Invalid ID: " << input_method_id;
 243     return false;
 244   }
 245
 246   if (!Contains(*new_active_input_method_ids, input_method_id))
 247     new_active_input_method_ids->push_back(input_method_id);
 248
 249   return true;
 250 }
 251
 252 // Starts or stops the system input method framework as needed.
 253 void InputMethodManagerImpl::ReconfigureIMFramework() {
 254   LoadNecessaryComponentExtensions();
 255
 256   // Initialize candidate window controller and widgets such as
 257   // candidate window, infolist and mode indicator.  Note, mode
 258   // indicator is used by only keyboard layout input methods.
 259   MaybeInitializeCandidateWindowController();
 260 }
 261
 262 bool InputMethodManagerImpl::EnableInputMethod(
 263     const std::string& input_method_id) {
 264   if (!EnableInputMethodImpl(input_method_id, &active_input_method_ids_))
 265     return false;
 266
 267   ReconfigureIMFramework();
 268   return true;
 269 }
 270
 271 bool InputMethodManagerImpl::ReplaceEnabledInputMethods(
 272     const std::vector<std::string>& new_active_input_method_ids) {
 273   if (state_ == STATE_TERMINATING)
 274     return false;
 275
 276   // Filter unknown or obsolete IDs.
 277   std::vector<std::string> new_active_input_method_ids_filtered;
 278
 279   for (size_t i = 0; i < new_active_input_method_ids.size(); ++i)
 280     EnableInputMethodImpl(new_active_input_method_ids[i],
 281                           &new_active_input_method_ids_filtered);
 282
 283   if (new_active_input_method_ids_filtered.empty()) {
 284     DVLOG(1) << "ReplaceEnabledInputMethods: No valid input method ID";
 285     return false;
 286   }
 287
 288   // Copy extension IDs to |new_active_input_method_ids_filtered|. We have to
 289   // keep relative order of the extension input method IDs.
 290   for (size_t i = 0; i < active_input_method_ids_.size(); ++i) {
 291     const std::string& input_method_id = active_input_method_ids_[i];
 292     if (extension_ime_util::IsExtensionIME(input_method_id))
 293       new_active_input_method_ids_filtered.push_back(input_method_id);
 294   }
 295   active_input_method_ids_.swap(new_active_input_method_ids_filtered);
 296   MigrateXkbInputMethods(&active_input_method_ids_);
 297
 298   ReconfigureIMFramework();
 299
 300   // If |current_input_method| is no longer in |active_input_method_ids_|,
 301   // ChangeInputMethod() picks the first one in |active_input_method_ids_|.
 302   ChangeInputMethod(current_input_method_.id());
 303   return true;
 304 }
 305
 306 void InputMethodManagerImpl::ChangeInputMethod(
 307     const std::string& input_method_id) {
 308   ChangeInputMethodInternal(input_method_id, false);
 309 }
 310
 311 bool InputMethodManagerImpl::ChangeInputMethodInternal(
 312     const std::string& input_method_id,
 313     bool show_message) {
 314   if (state_ == STATE_TERMINATING)
 315     return false;
 316
 317   std::string input_method_id_to_switch = input_method_id;
 318
 319   // Sanity check.
 320   if (!InputMethodIsActivated(input_method_id)) {
 321     scoped_ptr<InputMethodDescriptors> input_methods(GetActiveInputMethods());
 322     DCHECK(!input_methods->empty());
 323     input_method_id_to_switch = input_methods->at(0).id();
 324     if (!input_method_id.empty()) {
 325       DVLOG(1) << "Can't change the current input method to "
 326                << input_method_id << " since the engine is not enabled. "
 327                << "Switch to " << input_method_id_to_switch << " instead.";
 328     }
 329   }
 330
 331   if (!component_extension_ime_manager_->IsInitialized() &&
 332       (!InputMethodUtil::IsKeyboardLayout(input_method_id_to_switch) ||
 333        extension_ime_util::IsKeyboardLayoutExtension(
 334            input_method_id_to_switch))) {
 335     // We can't change input method before the initialization of
 336     // component extension ime manager.  ChangeInputMethod will be
 337     // called with |pending_input_method_| when the initialization is
 338     // done.
 339     pending_input_method_ = input_method_id_to_switch;
 340     return false;
 341   }
 342   pending_input_method_.clear();
 343
 344   // Hide candidate window and info list.
 345   if (candidate_window_controller_.get())
 346     candidate_window_controller_->Hide();
 347
 348   // Disable the current engine handler.
 349   IMEEngineHandlerInterface* engine =
 350       IMEBridge::Get()->GetCurrentEngineHandler();
 351   if (engine)
 352     engine->Disable();
 353
 354   // Configure the next engine handler.
 355   if (InputMethodUtil::IsKeyboardLayout(input_method_id_to_switch) &&
 356       !extension_ime_util::IsKeyboardLayoutExtension(
 357           input_method_id_to_switch)) {
 358     IMEBridge::Get()->SetCurrentEngineHandler(NULL);
 359   } else {
 360     IMEEngineHandlerInterface* next_engine =
 361         profile_engine_map_[GetProfile()][input_method_id_to_switch];
 362     if (next_engine) {
 363       IMEBridge::Get()->SetCurrentEngineHandler(next_engine);
 364       next_engine->Enable();
 365     }
 366   }
 367
 368   // TODO(komatsu): Check if it is necessary to perform the above routine
 369   // when the current input method is equal to |input_method_id_to_swich|.
 370   if (current_input_method_.id() != input_method_id_to_switch) {
 371     // Clear property list.  Property list would be updated by
 372     // extension IMEs via InputMethodEngine::(Set|Update)MenuItems.
 373     // If the current input method is a keyboard layout, empty
 374     // properties are sufficient.
 375     const ash::ime::InputMethodMenuItemList empty_menu_item_list;
 376     ash::ime::InputMethodMenuManager* input_method_menu_manager =
 377         ash::ime::InputMethodMenuManager::GetInstance();
 378     input_method_menu_manager->SetCurrentInputMethodMenuItemList(
 379             empty_menu_item_list);
 380
 381     const InputMethodDescriptor* descriptor = NULL;
 382     if (extension_ime_util::IsExtensionIME(input_method_id_to_switch)) {
 383       DCHECK(extra_input_methods_.find(input_method_id_to_switch) !=
 384              extra_input_methods_.end());
 385       descriptor = &(extra_input_methods_[input_method_id_to_switch]);
 386     } else {
 387       descriptor =
 388           util_.GetInputMethodDescriptorFromId(input_method_id_to_switch);
 389     }
 390     DCHECK(descriptor);
 391
 392     previous_input_method_ = current_input_method_;
 393     current_input_method_ = *descriptor;
 394   }
 395
 396   // Change the keyboard layout to a preferred layout for the input method.
 397   if (!keyboard_->SetCurrentKeyboardLayoutByName(
 398           current_input_method_.GetPreferredKeyboardLayout())) {
 399     LOG(ERROR) << "Failed to change keyboard layout to "
 400                << current_input_method_.GetPreferredKeyboardLayout();
 401   }
 402
 403   // Update input method indicators (e.g. "US", "DV") in Chrome windows.
 404   FOR_EACH_OBSERVER(InputMethodManager::Observer,
 405                     observers_,
 406                     InputMethodChanged(this, show_message));
 407   return true;
 408 }
 409
 410 void InputMethodManagerImpl::OnComponentExtensionInitialized(
 411     scoped_ptr<ComponentExtensionIMEManagerDelegate> delegate) {
 412   DCHECK(thread_checker_.CalledOnValidThread());
 413   component_extension_ime_manager_->Initialize(delegate.Pass());
 414   util_.SetComponentExtensions(
 415       component_extension_ime_manager_->GetAllIMEAsInputMethodDescriptor());
 416
 417   LoadNecessaryComponentExtensions();
 418
 419   if (!pending_input_method_.empty())
 420     ChangeInputMethodInternal(pending_input_method_, false);
 421 }
 422
 423 void InputMethodManagerImpl::LoadNecessaryComponentExtensions() {
 424   if (!component_extension_ime_manager_->IsInitialized())
 425     return;
 426   // Load component extensions but also update |active_input_method_ids_| as
 427   // some component extension IMEs may have been removed from the Chrome OS
 428   // image. If specified component extension IME no longer exists, falling back
 429   // to an existing IME.
 430   std::vector<std::string> unfiltered_input_method_ids;
 431   unfiltered_input_method_ids.swap(active_input_method_ids_);
 432   for (size_t i = 0; i < unfiltered_input_method_ids.size(); ++i) {
 433     if (!extension_ime_util::IsComponentExtensionIME(
 434         unfiltered_input_method_ids[i])) {
 435       // Legacy IMEs or xkb layouts are alwayes active.
 436       active_input_method_ids_.push_back(unfiltered_input_method_ids[i]);
 437     } else if (component_extension_ime_manager_->IsWhitelisted(
 438         unfiltered_input_method_ids[i])) {
 439       component_extension_ime_manager_->LoadComponentExtensionIME(
 440           unfiltered_input_method_ids[i]);
 441       active_input_method_ids_.push_back(unfiltered_input_method_ids[i]);
 442     }
 443   }
 444   // TODO(shuchen): move this call in ComponentExtensionIMEManager.
 445   component_extension_ime_manager_->NotifyInitialized();
 446 }
 447
 448 void InputMethodManagerImpl::ActivateInputMethodMenuItem(
 449     const std::string& key) {
 450   DCHECK(!key.empty());
 451
 452   if (ash::ime::InputMethodMenuManager::GetInstance()->
 453       HasInputMethodMenuItemForKey(key)) {
 454     IMEEngineHandlerInterface* engine =
 455         IMEBridge::Get()->GetCurrentEngineHandler();
 456     if (engine)
 457       engine->PropertyActivate(key);
 458     return;
 459   }
 460
 461   DVLOG(1) << "ActivateInputMethodMenuItem: unknown key: " << key;
 462 }
 463
 464 void InputMethodManagerImpl::AddInputMethodExtension(
 465     const std::string& id,
 466     InputMethodEngineInterface* engine) {
 467   if (state_ == STATE_TERMINATING)
 468     return;
 469
 470   if (!extension_ime_util::IsExtensionIME(id) &&
 471       !extension_ime_util::IsComponentExtensionIME(id)) {
 472     DVLOG(1) << id << " is not a valid extension input method ID.";
 473     return;
 474   }
 475
 476   DCHECK(engine);
 477
 478   const InputMethodDescriptor& descriptor = engine->GetDescriptor();
 479   extra_input_methods_[id] = descriptor;
 480   if (Contains(enabled_extension_imes_, id) &&
 481       !extension_ime_util::IsComponentExtensionIME(id)) {
 482     if (!Contains(active_input_method_ids_, id)) {
 483       active_input_method_ids_.push_back(id);
 484     } else {
 485       DVLOG(1) << "AddInputMethodExtension: alread added: "
 486                << id << ", " << descriptor.name();
 487       // Call Start() anyway, just in case.
 488     }
 489
 490     // Ensure that the input method daemon is running.
 491     MaybeInitializeCandidateWindowController();
 492   }
 493
 494   profile_engine_map_[GetProfile()][id] = engine;
 495 }
 496
 497 void InputMethodManagerImpl::RemoveInputMethodExtension(const std::string& id) {
 498   if (!extension_ime_util::IsExtensionIME(id))
 499     DVLOG(1) << id << " is not a valid extension input method ID.";
 500
 501   std::vector<std::string>::iterator i = std::find(
 502       active_input_method_ids_.begin(), active_input_method_ids_.end(), id);
 503   if (i != active_input_method_ids_.end())
 504     active_input_method_ids_.erase(i);
 505   extra_input_methods_.erase(id);
 506
 507   // If |current_input_method| is no longer in |active_input_method_ids_|,
 508   // switch to the first one in |active_input_method_ids_|.
 509   ChangeInputMethod(current_input_method_.id());
 510
 511   if (IMEBridge::Get()->GetCurrentEngineHandler() ==
 512       profile_engine_map_[GetProfile()][id])
 513     IMEBridge::Get()->SetCurrentEngineHandler(NULL);
 514 }
 515
 516 void InputMethodManagerImpl::GetInputMethodExtensions(
 517     InputMethodDescriptors* result) {
 518   // Build the extension input method descriptors from the extra input
 519   // methods cache |extra_input_methods_|.
 520   std::map<std::string, InputMethodDescriptor>::iterator iter;
 521   for (iter = extra_input_methods_.begin(); iter != extra_input_methods_.end();
 522        ++iter) {
 523     if (extension_ime_util::IsExtensionIME(iter->first))
 524       result->push_back(iter->second);
 525   }
 526 }
 527
 528 void InputMethodManagerImpl::SetEnabledExtensionImes(
 529     std::vector<std::string>* ids) {
 530   enabled_extension_imes_.clear();
 531   enabled_extension_imes_.insert(enabled_extension_imes_.end(),
 532                                  ids->begin(),
 533                                  ids->end());
 534
 535   bool active_imes_changed = false;
 536
 537   for (std::map<std::string, InputMethodDescriptor>::iterator extra_iter =
 538        extra_input_methods_.begin(); extra_iter != extra_input_methods_.end();
 539        ++extra_iter) {
 540     if (extension_ime_util::IsComponentExtensionIME(
 541         extra_iter->first))
 542       continue;  // Do not filter component extension.
 543     std::vector<std::string>::iterator active_iter = std::find(
 544         active_input_method_ids_.begin(), active_input_method_ids_.end(),
 545         extra_iter->first);
 546
 547     bool active = active_iter != active_input_method_ids_.end();
 548     bool enabled = Contains(enabled_extension_imes_, extra_iter->first);
 549
 550     if (active && !enabled)
 551       active_input_method_ids_.erase(active_iter);
 552
 553     if (!active && enabled)
 554       active_input_method_ids_.push_back(extra_iter->first);
 555
 556     if (active == !enabled)
 557       active_imes_changed = true;
 558   }
 559
 560   if (active_imes_changed) {
 561     MaybeInitializeCandidateWindowController();
 562
 563     // If |current_input_method| is no longer in |active_input_method_ids_|,
 564     // switch to the first one in |active_input_method_ids_|.
 565     ChangeInputMethod(current_input_method_.id());
 566   }
 567 }
 568
 569 void InputMethodManagerImpl::SetInputMethodLoginDefault() {
 570   // Set up keyboards. For example, when |locale| is "en-US", enable US qwerty
 571   // and US dvorak keyboard layouts.
 572   if (g_browser_process && g_browser_process->local_state()) {
 573     const std::string locale = g_browser_process->GetApplicationLocale();
 574     // If the preferred keyboard for the login screen has been saved, use it.
 575     PrefService* prefs = g_browser_process->local_state();
 576     std::string initial_input_method_id =
 577         prefs->GetString(chromeos::language_prefs::kPreferredKeyboardLayout);
 578     std::vector<std::string> input_methods_to_be_enabled;
 579     if (initial_input_method_id.empty()) {
 580       // If kPreferredKeyboardLayout is not specified, use the hardware layout.
 581       input_methods_to_be_enabled = util_.GetHardwareLoginInputMethodIds();
 582     } else {
 583       input_methods_to_be_enabled.push_back(initial_input_method_id);
 584     }
 585     EnableLoginLayouts(locale, input_methods_to_be_enabled);
 586   }
 587 }
 588
 589 bool InputMethodManagerImpl::SwitchToNextInputMethod() {
 590   // Sanity checks.
 591   if (active_input_method_ids_.empty()) {
 592     DVLOG(1) << "active input method is empty";
 593     return false;
 594   }
 595
 596   if (current_input_method_.id().empty()) {
 597     DVLOG(1) << "current_input_method_ is unknown";
 598     return false;
 599   }
 600
 601   // Do not consume key event if there is only one input method is enabled.
 602   // Ctrl+Space or Alt+Shift may be used by other application.
 603   if (active_input_method_ids_.size() == 1)
 604     return false;
 605
 606   // Find the next input method and switch to it.
 607   SwitchToNextInputMethodInternal(active_input_method_ids_,
 608                                   current_input_method_.id());
 609   return true;
 610 }
 611
 612 bool InputMethodManagerImpl::SwitchToPreviousInputMethod(
 613     const ui::Accelerator& accelerator) {
 614   // Sanity check.
 615   if (active_input_method_ids_.empty()) {
 616     DVLOG(1) << "active input method is empty";
 617     return false;
 618   }
 619
 620   // Do not consume key event if there is only one input method is enabled.
 621   // Ctrl+Space or Alt+Shift may be used by other application.
 622   if (active_input_method_ids_.size() == 1)
 623     return false;
 624
 625   if (accelerator.type() == ui::ET_KEY_RELEASED)
 626     return true;
 627
 628   if (previous_input_method_.id().empty() ||
 629       previous_input_method_.id() == current_input_method_.id()) {
 630     return SwitchToNextInputMethod();
 631   }
 632
 633   std::vector<std::string>::const_iterator iter =
 634       std::find(active_input_method_ids_.begin(),
 635                 active_input_method_ids_.end(),
 636                 previous_input_method_.id());
 637   if (iter == active_input_method_ids_.end()) {
 638     // previous_input_method_ is not supported.
 639     return SwitchToNextInputMethod();
 640   }
 641   ChangeInputMethodInternal(*iter, true);
 642   return true;
 643 }
 644
 645 bool InputMethodManagerImpl::SwitchInputMethod(
 646     const ui::Accelerator& accelerator) {
 647   // Sanity check.
 648   if (active_input_method_ids_.empty()) {
 649     DVLOG(1) << "active input method is empty";
 650     return false;
 651   }
 652
 653   // Get the list of input method ids for the |accelerator|. For example, get
 654   // { "mozc-hangul", "xkb:kr:kr104:kor" } for ui::VKEY_DBE_SBCSCHAR.
 655   std::vector<std::string> input_method_ids_to_switch;
 656   switch (accelerator.key_code()) {
 657     case ui::VKEY_CONVERT:  // Henkan key on JP106 keyboard
 658       input_method_ids_to_switch.push_back(nacl_mozc_jp_id);
 659       break;
 660     case ui::VKEY_NONCONVERT:  // Muhenkan key on JP106 keyboard
 661       input_method_ids_to_switch.push_back("xkb:jp::jpn");
 662       break;
 663     case ui::VKEY_DBE_SBCSCHAR:  // ZenkakuHankaku key on JP106 keyboard
 664     case ui::VKEY_DBE_DBCSCHAR:
 665       input_method_ids_to_switch.push_back(nacl_mozc_jp_id);
 666       input_method_ids_to_switch.push_back("xkb:jp::jpn");
 667       break;
 668     default:
 669       NOTREACHED();
 670       break;
 671   }
 672   if (input_method_ids_to_switch.empty()) {
 673     DVLOG(1) << "Unexpected VKEY: " << accelerator.key_code();
 674     return false;
 675   }
 676
 677   MigrateXkbInputMethods(&input_method_ids_to_switch);
 678
 679   // Obtain the intersection of input_method_ids_to_switch and
 680   // active_input_method_ids_. The order of IDs in active_input_method_ids_ is
 681   // preserved.
 682   std::vector<std::string> ids;
 683   for (size_t i = 0; i < input_method_ids_to_switch.size(); ++i) {
 684     const std::string& id = input_method_ids_to_switch[i];
 685     if (Contains(active_input_method_ids_, id))
 686       ids.push_back(id);
 687   }
 688   if (ids.empty()) {
 689     // No input method for the accelerator is active. For example, we should
 690     // just ignore VKEY_HANGUL when mozc-hangul is not active.
 691     return false;
 692   }
 693
 694   SwitchToNextInputMethodInternal(ids, current_input_method_.id());
 695   return true;  // consume the accelerator.
 696 }
 697
 698 void InputMethodManagerImpl::SwitchToNextInputMethodInternal(
 699     const std::vector<std::string>& input_method_ids,
 700     const std::string& current_input_method_id) {
 701   std::vector<std::string>::const_iterator iter =
 702       std::find(input_method_ids.begin(),
 703                 input_method_ids.end(),
 704                 current_input_method_id);
 705   if (iter != input_method_ids.end())
 706     ++iter;
 707   if (iter == input_method_ids.end())
 708     iter = input_method_ids.begin();
 709   ChangeInputMethodInternal(*iter, true);
 710 }
 711
 712 InputMethodDescriptor InputMethodManagerImpl::GetCurrentInputMethod() const {
 713   if (current_input_method_.id().empty())
 714     return InputMethodUtil::GetFallbackInputMethodDescriptor();
 715
 716   return current_input_method_;
 717 }
 718
 719 bool InputMethodManagerImpl::IsISOLevel5ShiftUsedByCurrentInputMethod() const {
 720   return keyboard_->IsISOLevel5ShiftAvailable();
 721 }
 722
 723 bool InputMethodManagerImpl::IsAltGrUsedByCurrentInputMethod() const {
 724   return keyboard_->IsAltGrAvailable();
 725 }
 726
 727 ImeKeyboard* InputMethodManagerImpl::GetImeKeyboard() {
 728   return keyboard_.get();
 729 }
 730
 731 InputMethodUtil* InputMethodManagerImpl::GetInputMethodUtil() {
 732   return &util_;
 733 }
 734
 735 ComponentExtensionIMEManager*
 736     InputMethodManagerImpl::GetComponentExtensionIMEManager() {
 737   DCHECK(thread_checker_.CalledOnValidThread());
 738   return component_extension_ime_manager_.get();
 739 }
 740
 741 void InputMethodManagerImpl::InitializeComponentExtension() {
 742   ComponentExtensionIMEManagerImpl* impl =
 743       new ComponentExtensionIMEManagerImpl();
 744   scoped_ptr<ComponentExtensionIMEManagerDelegate> delegate(impl);
 745   impl->InitializeAsync(base::Bind(
 746                        &InputMethodManagerImpl::OnComponentExtensionInitialized,
 747                        weak_ptr_factory_.GetWeakPtr(),
 748                        base::Passed(&delegate)));
 749 }
 750
 751 void InputMethodManagerImpl::Init(base::SequencedTaskRunner* ui_task_runner) {
 752   DCHECK(thread_checker_.CalledOnValidThread());
 753
 754   if (base::SysInfo::IsRunningOnChromeOS())
 755     keyboard_.reset(ImeKeyboard::Create());
 756   else
 757     keyboard_.reset(new FakeImeKeyboard());
 758
 759   // We can't call impl->Initialize here, because file thread is not available
 760   // at this moment.
 761   ui_task_runner->PostTask(
 762       FROM_HERE,
 763       base::Bind(&InputMethodManagerImpl::InitializeComponentExtension,
 764                  weak_ptr_factory_.GetWeakPtr()));
 765 }
 766
 767 void InputMethodManagerImpl::SetCandidateWindowControllerForTesting(
 768     CandidateWindowController* candidate_window_controller) {
 769   candidate_window_controller_.reset(candidate_window_controller);
 770   candidate_window_controller_->AddObserver(this);
 771 }
 772
 773 void InputMethodManagerImpl::SetImeKeyboardForTesting(ImeKeyboard* keyboard) {
 774   keyboard_.reset(keyboard);
 775 }
 776
 777 void InputMethodManagerImpl::InitializeComponentExtensionForTesting(
 778     scoped_ptr<ComponentExtensionIMEManagerDelegate> delegate) {
 779   OnComponentExtensionInitialized(delegate.Pass());
 780 }
 781
 782 void InputMethodManagerImpl::CandidateClicked(int index) {
 783   IMEEngineHandlerInterface* engine =
 784       IMEBridge::Get()->GetCurrentEngineHandler();
 785   if (engine)
 786     engine->CandidateClicked(index);
 787 }
 788
 789 void InputMethodManagerImpl::CandidateWindowOpened() {
 790   FOR_EACH_OBSERVER(InputMethodManager::CandidateWindowObserver,
 791                     candidate_window_observers_,
 792                     CandidateWindowOpened(this));
 793 }
 794
 795 void InputMethodManagerImpl::CandidateWindowClosed() {
 796   FOR_EACH_OBSERVER(InputMethodManager::CandidateWindowObserver,
 797                     candidate_window_observers_,
 798                     CandidateWindowClosed(this));
 799 }
 800
 801 void InputMethodManagerImpl::OnScreenLocked() {
 802   saved_previous_input_method_ = previous_input_method_;
 803   saved_current_input_method_ = current_input_method_;
 804   saved_active_input_method_ids_ = active_input_method_ids_;
 805
 806   std::set<std::string> added_ids_;
 807
 808   const std::vector<std::string>& hardware_keyboard_ids =
 809       util_.GetHardwareLoginInputMethodIds();
 810
 811   active_input_method_ids_.clear();
 812   for (size_t i = 0; i < saved_active_input_method_ids_.size(); ++i) {
 813     const std::string& input_method_id = saved_active_input_method_ids_[i];
 814     // Skip if it's not a keyboard layout. Drop input methods including
 815     // extension ones.
 816     if (!IsLoginKeyboard(input_method_id) ||
 817         added_ids_.find(input_method_id) != added_ids_.end())
 818       continue;
 819     active_input_method_ids_.push_back(input_method_id);
 820     added_ids_.insert(input_method_id);
 821   }
 822
 823   // We'll add the hardware keyboard if it's not included in
 824   // |active_input_method_ids_| so that the user can always use the hardware
 825   // keyboard on the screen locker.
 826   for (size_t i = 0; i < hardware_keyboard_ids.size(); ++i) {
 827     if (added_ids_.find(hardware_keyboard_ids[i]) == added_ids_.end()) {
 828       active_input_method_ids_.push_back(hardware_keyboard_ids[i]);
 829       added_ids_.insert(hardware_keyboard_ids[i]);
 830     }
 831   }
 832
 833   ChangeInputMethod(current_input_method_.id());
 834 }
 835
 836 void InputMethodManagerImpl::OnScreenUnlocked() {
 837   previous_input_method_ = saved_previous_input_method_;
 838   current_input_method_ = saved_current_input_method_;
 839   active_input_method_ids_ = saved_active_input_method_ids_;
 840
 841   ChangeInputMethod(current_input_method_.id());
 842 }
 843
 844 bool InputMethodManagerImpl::InputMethodIsActivated(
 845     const std::string& input_method_id) {
 846   return Contains(active_input_method_ids_, input_method_id);
 847 }
 848
 849 void InputMethodManagerImpl::MaybeInitializeCandidateWindowController() {
 850   if (candidate_window_controller_.get())
 851     return;
 852
 853   candidate_window_controller_.reset(
 854       CandidateWindowController::CreateCandidateWindowController());
 855   candidate_window_controller_->AddObserver(this);
 856 }
 857
 858 Profile* InputMethodManagerImpl::GetProfile() const {
 859   return ProfileManager::GetActiveUserProfile();
 860 }
 861
 862 }  // namespace input_method
 863 }  // namespace chromeos