ash/shell.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 "ash/shell.h"
   6
   7 #include <algorithm>
   8 #include <string>
   9
  10 #include "ash/accelerators/accelerator_controller.h"
  11 #include "ash/accelerators/accelerator_delegate.h"
  12 #include "ash/accelerators/focus_manager_factory.h"
  13 #include "ash/accelerators/nested_accelerator_delegate.h"
  14 #include "ash/accelerometer/accelerometer_controller.h"
  15 #include "ash/ash_switches.h"
  16 #include "ash/autoclick/autoclick_controller.h"
  17 #include "ash/desktop_background/desktop_background_controller.h"
  18 #include "ash/desktop_background/desktop_background_view.h"
  19 #include "ash/desktop_background/user_wallpaper_delegate.h"
  20 #include "ash/display/cursor_window_controller.h"
  21 #include "ash/display/display_controller.h"
  22 #include "ash/display/display_manager.h"
  23 #include "ash/display/event_transformation_handler.h"
  24 #include "ash/display/mouse_cursor_event_filter.h"
  25 #include "ash/display/screen_position_controller.h"
  26 #include "ash/drag_drop/drag_drop_controller.h"
  27 #include "ash/first_run/first_run_helper_impl.h"
  28 #include "ash/focus_cycler.h"
  29 #include "ash/frame/custom_frame_view_ash.h"
  30 #include "ash/gpu_support.h"
  31 #include "ash/high_contrast/high_contrast_controller.h"
  32 #include "ash/host/ash_window_tree_host_init_params.h"
  33 #include "ash/keyboard_uma_event_filter.h"
  34 #include "ash/magnifier/magnification_controller.h"
  35 #include "ash/magnifier/partial_magnification_controller.h"
  36 #include "ash/media_delegate.h"
  37 #include "ash/new_window_delegate.h"
  38 #include "ash/root_window_controller.h"
  39 #include "ash/session/session_state_delegate.h"
  40 #include "ash/shelf/app_list_shelf_item_delegate.h"
  41 #include "ash/shelf/shelf_delegate.h"
  42 #include "ash/shelf/shelf_item_delegate.h"
  43 #include "ash/shelf/shelf_item_delegate_manager.h"
  44 #include "ash/shelf/shelf_layout_manager.h"
  45 #include "ash/shelf/shelf_model.h"
  46 #include "ash/shelf/shelf_widget.h"
  47 #include "ash/shelf/shelf_window_watcher.h"
  48 #include "ash/shell_delegate.h"
  49 #include "ash/shell_factory.h"
  50 #include "ash/shell_init_params.h"
  51 #include "ash/shell_window_ids.h"
  52 #include "ash/system/locale/locale_notification_controller.h"
  53 #include "ash/system/status_area_widget.h"
  54 #include "ash/system/tray/system_tray_delegate.h"
  55 #include "ash/system/tray/system_tray_notifier.h"
  56 #include "ash/virtual_keyboard_controller.h"
  57 #include "ash/wm/app_list_controller.h"
  58 #include "ash/wm/ash_focus_rules.h"
  59 #include "ash/wm/ash_native_cursor_manager.h"
  60 #include "ash/wm/coordinate_conversion.h"
  61 #include "ash/wm/event_client_impl.h"
  62 #include "ash/wm/lock_state_controller.h"
  63 #include "ash/wm/maximize_mode/maximize_mode_controller.h"
  64 #include "ash/wm/maximize_mode/maximize_mode_window_manager.h"
  65 #include "ash/wm/mru_window_tracker.h"
  66 #include "ash/wm/overlay_event_filter.h"
  67 #include "ash/wm/overview/window_selector_controller.h"
  68 #include "ash/wm/power_button_controller.h"
  69 #include "ash/wm/resize_shadow_controller.h"
  70 #include "ash/wm/root_window_layout_manager.h"
  71 #include "ash/wm/screen_dimmer.h"
  72 #include "ash/wm/system_gesture_event_filter.h"
  73 #include "ash/wm/system_modal_container_event_filter.h"
  74 #include "ash/wm/system_modal_container_layout_manager.h"
  75 #include "ash/wm/toplevel_window_event_handler.h"
  76 #include "ash/wm/video_detector.h"
  77 #include "ash/wm/window_animations.h"
  78 #include "ash/wm/window_cycle_controller.h"
  79 #include "ash/wm/window_positioner.h"
  80 #include "ash/wm/window_properties.h"
  81 #include "ash/wm/window_util.h"
  82 #include "ash/wm/workspace_controller.h"
  83 #include "base/bind.h"
  84 #include "base/debug/trace_event.h"
  85 #include "ui/aura/client/aura_constants.h"
  86 #include "ui/aura/env.h"
  87 #include "ui/aura/layout_manager.h"
  88 #include "ui/aura/window.h"
  89 #include "ui/aura/window_event_dispatcher.h"
  90 #include "ui/base/ui_base_switches.h"
  91 #include "ui/compositor/layer.h"
  92 #include "ui/compositor/layer_animator.h"
  93 #include "ui/events/event_target_iterator.h"
  94 #include "ui/gfx/display.h"
  95 #include "ui/gfx/image/image_skia.h"
  96 #include "ui/gfx/screen.h"
  97 #include "ui/gfx/size.h"
  98 #include "ui/keyboard/keyboard.h"
  99 #include "ui/keyboard/keyboard_controller.h"
 100 #include "ui/keyboard/keyboard_switches.h"
 101 #include "ui/keyboard/keyboard_util.h"
 102 #include "ui/message_center/message_center.h"
 103 #include "ui/views/corewm/tooltip_aura.h"
 104 #include "ui/views/corewm/tooltip_controller.h"
 105 #include "ui/views/focus/focus_manager_factory.h"
 106 #include "ui/views/widget/native_widget_aura.h"
 107 #include "ui/views/widget/widget.h"
 108 #include "ui/wm/core/accelerator_filter.h"
 109 #include "ui/wm/core/compound_event_filter.h"
 110 #include "ui/wm/core/focus_controller.h"
 111 #include "ui/wm/core/input_method_event_filter.h"
 112 #include "ui/wm/core/nested_accelerator_controller.h"
 113 #include "ui/wm/core/shadow_controller.h"
 114 #include "ui/wm/core/user_activity_detector.h"
 115 #include "ui/wm/core/visibility_controller.h"
 116 #include "ui/wm/core/window_modality_controller.h"
 117
 118 #if defined(OS_CHROMEOS)
 119 #if defined(USE_X11)
 120 #include "ash/accelerators/magnifier_key_scroller.h"
 121 #include "ash/accelerators/spoken_feedback_toggler.h"
 122 #include "ash/touch/touch_transformer_controller.h"
 123 #include "ui/gfx/x/x11_types.h"
 124 #endif  // defined(USE_X11)
 125 #include "ash/ash_constants.h"
 126 #include "ash/display/display_change_observer_chromeos.h"
 127 #include "ash/display/display_configurator_animation.h"
 128 #include "ash/display/display_error_observer_chromeos.h"
 129 #include "ash/display/projecting_observer_chromeos.h"
 130 #include "ash/display/resolution_notification_controller.h"
 131 #include "ash/sticky_keys/sticky_keys_controller.h"
 132 #include "ash/system/chromeos/bluetooth/bluetooth_notification_controller.h"
 133 #include "ash/system/chromeos/brightness/brightness_controller_chromeos.h"
 134 #include "ash/system/chromeos/power/power_event_observer.h"
 135 #include "ash/system/chromeos/power/power_status.h"
 136 #include "ash/system/chromeos/power/video_activity_notifier.h"
 137 #include "ash/system/chromeos/session/last_window_closed_logout_reminder.h"
 138 #include "ash/system/chromeos/session/logout_confirmation_controller.h"
 139 #include "base/bind_helpers.h"
 140 #include "base/sys_info.h"
 141 #include "ui/chromeos/user_activity_power_manager_notifier.h"
 142 #include "ui/display/chromeos/display_configurator.h"
 143 #endif  // defined(OS_CHROMEOS)
 144
 145 namespace ash {
 146
 147 namespace {
 148
 149 using aura::Window;
 150 using views::Widget;
 151
 152 // A Corewm VisibilityController subclass that calls the Ash animation routine
 153 // so we can pick up our extended animations. See ash/wm/window_animations.h.
 154 class AshVisibilityController : public ::wm::VisibilityController {
 155  public:
 156   AshVisibilityController() {}
 157   virtual ~AshVisibilityController() {}
 158
 159  private:
 160   // Overridden from ::wm::VisibilityController:
 161   virtual bool CallAnimateOnChildWindowVisibilityChanged(
 162       aura::Window* window,
 163       bool visible) OVERRIDE {
 164     return AnimateOnChildWindowVisibilityChanged(window, visible);
 165   }
 166
 167   DISALLOW_COPY_AND_ASSIGN(AshVisibilityController);
 168 };
 169
 170 AshWindowTreeHostInitParams ShellInitParamsToAshWindowTreeHostInitParams(
 171     const ShellInitParams& shell_init_params) {
 172   AshWindowTreeHostInitParams ash_init_params;
 173 #if defined(OS_WIN)
 174   ash_init_params.remote_hwnd = shell_init_params.remote_hwnd;
 175 #endif
 176   return ash_init_params;
 177 }
 178
 179 }  // namespace
 180
 181 // static
 182 Shell* Shell::instance_ = NULL;
 183 // static
 184 bool Shell::initially_hide_cursor_ = false;
 185
 186 ////////////////////////////////////////////////////////////////////////////////
 187 // Shell, public:
 188
 189 // static
 190 Shell* Shell::CreateInstance(const ShellInitParams& init_params) {
 191   CHECK(!instance_);
 192   instance_ = new Shell(init_params.delegate);
 193   instance_->Init(init_params);
 194   return instance_;
 195 }
 196
 197 // static
 198 Shell* Shell::GetInstance() {
 199   CHECK(instance_);
 200   return instance_;
 201 }
 202
 203 // static
 204 bool Shell::HasInstance() {
 205   return !!instance_;
 206 }
 207
 208 // static
 209 void Shell::DeleteInstance() {
 210   delete instance_;
 211   instance_ = NULL;
 212 }
 213
 214 // static
 215 RootWindowController* Shell::GetPrimaryRootWindowController() {
 216   CHECK(HasInstance());
 217   return GetRootWindowController(GetPrimaryRootWindow());
 218 }
 219
 220 // static
 221 Shell::RootWindowControllerList Shell::GetAllRootWindowControllers() {
 222   CHECK(HasInstance());
 223   return Shell::GetInstance()->display_controller()->
 224       GetAllRootWindowControllers();
 225 }
 226
 227 // static
 228 aura::Window* Shell::GetPrimaryRootWindow() {
 229   CHECK(HasInstance());
 230   return GetInstance()->display_controller()->GetPrimaryRootWindow();
 231 }
 232
 233 // static
 234 aura::Window* Shell::GetTargetRootWindow() {
 235   CHECK(HasInstance());
 236   Shell* shell = GetInstance();
 237   if (shell->scoped_target_root_window_)
 238     return shell->scoped_target_root_window_;
 239   return shell->target_root_window_;
 240 }
 241
 242 // static
 243 gfx::Screen* Shell::GetScreen() {
 244   return gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_ALTERNATE);
 245 }
 246
 247 // static
 248 aura::Window::Windows Shell::GetAllRootWindows() {
 249   CHECK(HasInstance());
 250   return Shell::GetInstance()->display_controller()->
 251       GetAllRootWindows();
 252 }
 253
 254 // static
 255 aura::Window* Shell::GetContainer(aura::Window* root_window,
 256                                   int container_id) {
 257   return root_window->GetChildById(container_id);
 258 }
 259
 260 // static
 261 const aura::Window* Shell::GetContainer(const aura::Window* root_window,
 262                                         int container_id) {
 263   return root_window->GetChildById(container_id);
 264 }
 265
 266 // static
 267 std::vector<aura::Window*> Shell::GetContainersFromAllRootWindows(
 268     int container_id,
 269     aura::Window* priority_root) {
 270   std::vector<aura::Window*> containers;
 271   aura::Window::Windows root_windows = GetAllRootWindows();
 272   for (aura::Window::Windows::const_iterator it = root_windows.begin();
 273        it != root_windows.end(); ++it) {
 274     aura::Window* container = (*it)->GetChildById(container_id);
 275     if (container) {
 276       if (priority_root && priority_root->Contains(container))
 277         containers.insert(containers.begin(), container);
 278       else
 279         containers.push_back(container);
 280     }
 281   }
 282   return containers;
 283 }
 284
 285 void Shell::ShowContextMenu(const gfx::Point& location_in_screen,
 286                             ui::MenuSourceType source_type) {
 287   // No context menus if there is no session with an active user.
 288   if (!session_state_delegate_->NumberOfLoggedInUsers())
 289     return;
 290   // No context menus when screen is locked.
 291   if (session_state_delegate_->IsScreenLocked())
 292     return;
 293
 294   aura::Window* root =
 295       wm::GetRootWindowMatching(gfx::Rect(location_in_screen, gfx::Size()));
 296   GetRootWindowController(root)
 297       ->ShowContextMenu(location_in_screen, source_type);
 298 }
 299
 300 void Shell::ShowAppList(aura::Window* window) {
 301   // If the context window is not given, show it on the target root window.
 302   if (!window)
 303     window = GetTargetRootWindow();
 304   if (!app_list_controller_)
 305     app_list_controller_.reset(new AppListController);
 306   app_list_controller_->Show(window);
 307 }
 308
 309 void Shell::DismissAppList() {
 310   if (!app_list_controller_)
 311     return;
 312   app_list_controller_->Dismiss();
 313 }
 314
 315 void Shell::ToggleAppList(aura::Window* window) {
 316   if (app_list_controller_ && app_list_controller_->IsVisible()) {
 317     DismissAppList();
 318     return;
 319   }
 320
 321   ShowAppList(window);
 322 }
 323
 324 bool Shell::GetAppListTargetVisibility() const {
 325   return app_list_controller_.get() &&
 326       app_list_controller_->GetTargetVisibility();
 327 }
 328
 329 aura::Window* Shell::GetAppListWindow() {
 330   return app_list_controller_.get() ? app_list_controller_->GetWindow() : NULL;
 331 }
 332
 333 app_list::AppListView* Shell::GetAppListView() {
 334   return app_list_controller_.get() ? app_list_controller_->GetView() : NULL;
 335 }
 336
 337 bool Shell::IsSystemModalWindowOpen() const {
 338   if (simulate_modal_window_open_for_testing_)
 339     return true;
 340   const std::vector<aura::Window*> containers = GetContainersFromAllRootWindows(
 341       kShellWindowId_SystemModalContainer, NULL);
 342   for (std::vector<aura::Window*>::const_iterator cit = containers.begin();
 343        cit != containers.end(); ++cit) {
 344     for (aura::Window::Windows::const_iterator wit = (*cit)->children().begin();
 345          wit != (*cit)->children().end(); ++wit) {
 346       if ((*wit)->GetProperty(aura::client::kModalKey) ==
 347           ui::MODAL_TYPE_SYSTEM && (*wit)->TargetVisibility()) {
 348         return true;
 349       }
 350     }
 351   }
 352   return false;
 353 }
 354
 355 views::NonClientFrameView* Shell::CreateDefaultNonClientFrameView(
 356     views::Widget* widget) {
 357   // Use translucent-style window frames for dialogs.
 358   return new CustomFrameViewAsh(widget);
 359 }
 360
 361 void Shell::RotateFocus(Direction direction) {
 362   focus_cycler_->RotateFocus(direction == FORWARD ? FocusCycler::FORWARD
 363                                                   : FocusCycler::BACKWARD);
 364 }
 365
 366 void Shell::SetDisplayWorkAreaInsets(Window* contains,
 367                                      const gfx::Insets& insets) {
 368   if (!display_controller_->UpdateWorkAreaOfDisplayNearestWindow(
 369           contains, insets)) {
 370     return;
 371   }
 372   FOR_EACH_OBSERVER(ShellObserver, observers_,
 373                     OnDisplayWorkAreaInsetsChanged());
 374 }
 375
 376 void Shell::OnLoginStateChanged(user::LoginStatus status) {
 377   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLoginStateChanged(status));
 378 }
 379
 380 void Shell::OnLoginUserProfilePrepared() {
 381   CreateShelf();
 382   CreateKeyboard();
 383 }
 384
 385 void Shell::UpdateAfterLoginStatusChange(user::LoginStatus status) {
 386   RootWindowControllerList controllers = GetAllRootWindowControllers();
 387   for (RootWindowControllerList::iterator iter = controllers.begin();
 388        iter != controllers.end(); ++iter)
 389     (*iter)->UpdateAfterLoginStatusChange(status);
 390 }
 391
 392 void Shell::OnAppTerminating() {
 393   FOR_EACH_OBSERVER(ShellObserver, observers_, OnAppTerminating());
 394 }
 395
 396 void Shell::OnLockStateChanged(bool locked) {
 397   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLockStateChanged(locked));
 398 #ifndef NDEBUG
 399   // Make sure that there is no system modal in Lock layer when unlocked.
 400   if (!locked) {
 401     std::vector<aura::Window*> containers = GetContainersFromAllRootWindows(
 402         kShellWindowId_LockSystemModalContainer, GetPrimaryRootWindow());
 403     for (std::vector<aura::Window*>::const_iterator iter = containers.begin();
 404          iter != containers.end(); ++iter) {
 405       DCHECK_EQ(0u, (*iter)->children().size());
 406     }
 407   }
 408 #endif
 409 }
 410
 411 void Shell::OnCastingSessionStartedOrStopped(bool started) {
 412 #if defined(OS_CHROMEOS) && defined(USE_X11)
 413   if (projecting_observer_)
 414     projecting_observer_->OnCastingSessionStartedOrStopped(started);
 415 #endif
 416 }
 417
 418 void Shell::OnOverviewModeStarting() {
 419   FOR_EACH_OBSERVER(ShellObserver, observers_, OnOverviewModeStarting());
 420 }
 421
 422 void Shell::OnOverviewModeEnding() {
 423   FOR_EACH_OBSERVER(ShellObserver, observers_, OnOverviewModeEnding());
 424 }
 425
 426 void Shell::OnMaximizeModeStarted() {
 427   FOR_EACH_OBSERVER(ShellObserver, observers_, OnMaximizeModeStarted());
 428 }
 429
 430 void Shell::OnMaximizeModeEnded() {
 431   FOR_EACH_OBSERVER(ShellObserver, observers_, OnMaximizeModeEnded());
 432 }
 433
 434 void Shell::OnRootWindowAdded(aura::Window* root_window) {
 435   FOR_EACH_OBSERVER(ShellObserver, observers_, OnRootWindowAdded(root_window));
 436 }
 437
 438 void Shell::CreateShelf() {
 439   RootWindowControllerList controllers = GetAllRootWindowControllers();
 440   for (RootWindowControllerList::iterator iter = controllers.begin();
 441        iter != controllers.end(); ++iter)
 442     (*iter)->shelf()->CreateShelf();
 443 }
 444
 445 void Shell::OnShelfCreatedForRootWindow(aura::Window* root_window) {
 446   FOR_EACH_OBSERVER(ShellObserver,
 447                     observers_,
 448                     OnShelfCreatedForRootWindow(root_window));
 449 }
 450
 451 void Shell::CreateKeyboard() {
 452   // TODO(bshe): Primary root window controller may not be the controller to
 453   // attach virtual keyboard. See http://crbug.com/303429
 454   InitKeyboard();
 455   GetPrimaryRootWindowController()->
 456       ActivateKeyboard(keyboard::KeyboardController::GetInstance());
 457 }
 458
 459 void Shell::DeactivateKeyboard() {
 460   if (keyboard::KeyboardController::GetInstance()) {
 461     RootWindowControllerList controllers = GetAllRootWindowControllers();
 462     for (RootWindowControllerList::iterator iter = controllers.begin();
 463         iter != controllers.end(); ++iter) {
 464       (*iter)->DeactivateKeyboard(keyboard::KeyboardController::GetInstance());
 465     }
 466   }
 467   keyboard::KeyboardController::ResetInstance(NULL);
 468 }
 469
 470 void Shell::ShowShelf() {
 471   RootWindowControllerList controllers = GetAllRootWindowControllers();
 472   for (RootWindowControllerList::iterator iter = controllers.begin();
 473        iter != controllers.end(); ++iter)
 474     (*iter)->ShowShelf();
 475 }
 476
 477 void Shell::AddShellObserver(ShellObserver* observer) {
 478   observers_.AddObserver(observer);
 479 }
 480
 481 void Shell::RemoveShellObserver(ShellObserver* observer) {
 482   observers_.RemoveObserver(observer);
 483 }
 484
 485 #if defined(OS_CHROMEOS)
 486 bool Shell::ShouldSaveDisplaySettings() {
 487   return !((maximize_mode_controller_->IsMaximizeModeWindowManagerEnabled() &&
 488             maximize_mode_controller_->
 489                 ignore_display_configuration_updates()) ||
 490            resolution_notification_controller_->DoesNotificationTimeout());
 491 }
 492 #endif
 493
 494 void Shell::UpdateShelfVisibility() {
 495   RootWindowControllerList controllers = GetAllRootWindowControllers();
 496   for (RootWindowControllerList::iterator iter = controllers.begin();
 497        iter != controllers.end(); ++iter)
 498     if ((*iter)->shelf())
 499       (*iter)->UpdateShelfVisibility();
 500 }
 501
 502 void Shell::SetShelfAutoHideBehavior(ShelfAutoHideBehavior behavior,
 503                                      aura::Window* root_window) {
 504   ash::ShelfLayoutManager::ForShelf(root_window)->SetAutoHideBehavior(behavior);
 505 }
 506
 507 ShelfAutoHideBehavior Shell::GetShelfAutoHideBehavior(
 508     aura::Window* root_window) const {
 509   return ash::ShelfLayoutManager::ForShelf(root_window)->auto_hide_behavior();
 510 }
 511
 512 void Shell::SetShelfAlignment(ShelfAlignment alignment,
 513                               aura::Window* root_window) {
 514   if (ash::ShelfLayoutManager::ForShelf(root_window)->SetAlignment(alignment)) {
 515     FOR_EACH_OBSERVER(
 516         ShellObserver, observers_, OnShelfAlignmentChanged(root_window));
 517   }
 518 }
 519
 520 ShelfAlignment Shell::GetShelfAlignment(const aura::Window* root_window) {
 521   return GetRootWindowController(root_window)
 522       ->GetShelfLayoutManager()
 523       ->GetAlignment();
 524 }
 525
 526 void Shell::SetDimming(bool should_dim) {
 527   RootWindowControllerList controllers = GetAllRootWindowControllers();
 528   for (RootWindowControllerList::iterator iter = controllers.begin();
 529        iter != controllers.end(); ++iter)
 530     (*iter)->screen_dimmer()->SetDimming(should_dim);
 531 }
 532
 533 void Shell::NotifyFullscreenStateChange(bool is_fullscreen,
 534                                         aura::Window* root_window) {
 535   FOR_EACH_OBSERVER(ShellObserver, observers_, OnFullscreenStateChanged(
 536       is_fullscreen, root_window));
 537 }
 538
 539 void Shell::CreateModalBackground(aura::Window* window) {
 540   if (!modality_filter_) {
 541     modality_filter_.reset(new SystemModalContainerEventFilter(this));
 542     AddPreTargetHandler(modality_filter_.get());
 543   }
 544   RootWindowControllerList controllers = GetAllRootWindowControllers();
 545   for (RootWindowControllerList::iterator iter = controllers.begin();
 546        iter != controllers.end(); ++iter)
 547     (*iter)->GetSystemModalLayoutManager(window)->CreateModalBackground();
 548 }
 549
 550 void Shell::OnModalWindowRemoved(aura::Window* removed) {
 551   RootWindowControllerList controllers = GetAllRootWindowControllers();
 552   bool activated = false;
 553   for (RootWindowControllerList::iterator iter = controllers.begin();
 554        iter != controllers.end() && !activated; ++iter) {
 555     activated = (*iter)->GetSystemModalLayoutManager(removed)->
 556         ActivateNextModalWindow();
 557   }
 558   if (!activated) {
 559     RemovePreTargetHandler(modality_filter_.get());
 560     modality_filter_.reset();
 561     for (RootWindowControllerList::iterator iter = controllers.begin();
 562          iter != controllers.end(); ++iter)
 563       (*iter)->GetSystemModalLayoutManager(removed)->DestroyModalBackground();
 564   }
 565 }
 566
 567 WebNotificationTray* Shell::GetWebNotificationTray() {
 568   return GetPrimaryRootWindowController()->shelf()->
 569       status_area_widget()->web_notification_tray();
 570 }
 571
 572 bool Shell::HasPrimaryStatusArea() {
 573   ShelfWidget* shelf = GetPrimaryRootWindowController()->shelf();
 574   return shelf && shelf->status_area_widget();
 575 }
 576
 577 SystemTray* Shell::GetPrimarySystemTray() {
 578   return GetPrimaryRootWindowController()->GetSystemTray();
 579 }
 580
 581 ShelfDelegate* Shell::GetShelfDelegate() {
 582   if (!shelf_delegate_) {
 583     shelf_model_.reset(new ShelfModel);
 584     // Creates ShelfItemDelegateManager before ShelfDelegate.
 585     shelf_item_delegate_manager_.reset(
 586         new ShelfItemDelegateManager(shelf_model_.get()));
 587
 588     shelf_delegate_.reset(delegate_->CreateShelfDelegate(shelf_model_.get()));
 589     scoped_ptr<ShelfItemDelegate> controller(new AppListShelfItemDelegate);
 590
 591     // Finding the shelf model's location of the app list and setting its
 592     // ShelfItemDelegate.
 593     int app_list_index = shelf_model_->GetItemIndexForType(TYPE_APP_LIST);
 594     DCHECK_GE(app_list_index, 0);
 595     ShelfID app_list_id = shelf_model_->items()[app_list_index].id;
 596     DCHECK(app_list_id);
 597     shelf_item_delegate_manager_->SetShelfItemDelegate(app_list_id,
 598                                                        controller.Pass());
 599     shelf_window_watcher_.reset(new ShelfWindowWatcher(
 600         shelf_model_.get(), shelf_item_delegate_manager_.get()));
 601   }
 602   return shelf_delegate_.get();
 603 }
 604
 605 void Shell::SetTouchHudProjectionEnabled(bool enabled) {
 606   if (is_touch_hud_projection_enabled_ == enabled)
 607     return;
 608
 609   is_touch_hud_projection_enabled_ = enabled;
 610   FOR_EACH_OBSERVER(ShellObserver, observers_,
 611                     OnTouchHudProjectionToggled(enabled));
 612 }
 613
 614 #if defined(OS_CHROMEOS)
 615 ash::FirstRunHelper* Shell::CreateFirstRunHelper() {
 616   return new ash::FirstRunHelperImpl;
 617 }
 618
 619 void Shell::SetCursorCompositingEnabled(bool enabled) {
 620   display_controller_->cursor_window_controller()->SetCursorCompositingEnabled(
 621       enabled);
 622   native_cursor_manager_->SetNativeCursorEnabled(!enabled);
 623 }
 624 #endif  // defined(OS_CHROMEOS)
 625
 626 void Shell::DoInitialWorkspaceAnimation() {
 627   return GetPrimaryRootWindowController()->workspace_controller()->
 628       DoInitialAnimation();
 629 }
 630
 631 ////////////////////////////////////////////////////////////////////////////////
 632 // Shell, private:
 633
 634 Shell::Shell(ShellDelegate* delegate)
 635     : target_root_window_(NULL),
 636       scoped_target_root_window_(NULL),
 637       delegate_(delegate),
 638       window_positioner_(new WindowPositioner),
 639       activation_client_(NULL),
 640       accelerometer_controller_(new AccelerometerController()),
 641 #if defined(OS_CHROMEOS)
 642       display_configurator_(new ui::DisplayConfigurator()),
 643 #endif  // defined(OS_CHROMEOS)
 644       native_cursor_manager_(new AshNativeCursorManager),
 645       cursor_manager_(
 646           scoped_ptr< ::wm::NativeCursorManager>(native_cursor_manager_)),
 647       simulate_modal_window_open_for_testing_(false),
 648       is_touch_hud_projection_enabled_(false) {
 649   DCHECK(delegate_.get());
 650   gpu_support_.reset(delegate_->CreateGPUSupport());
 651   display_manager_.reset(new DisplayManager);
 652   display_controller_.reset(new DisplayController);
 653 #if defined(OS_CHROMEOS) && defined(USE_X11)
 654   user_metrics_recorder_.reset(new UserMetricsRecorder);
 655 #endif  // defined(OS_CHROMEOS)
 656
 657 #if defined(OS_CHROMEOS)
 658   PowerStatus::Initialize();
 659 #endif
 660 }
 661
 662 Shell::~Shell() {
 663   TRACE_EVENT0("shutdown", "ash::Shell::Destructor");
 664
 665   delegate_->PreShutdown();
 666
 667   views::FocusManagerFactory::Install(NULL);
 668
 669   // Remove the focus from any window. This will prevent overhead and side
 670   // effects (e.g. crashes) from changing focus during shutdown.
 671   // See bug crbug.com/134502.
 672   aura::client::GetFocusClient(GetPrimaryRootWindow())->FocusWindow(NULL);
 673
 674   // Please keep in same order as in Init() because it's easy to miss one.
 675   if (window_modality_controller_)
 676     window_modality_controller_.reset();
 677 #if defined(OS_CHROMEOS) && defined(USE_X11)
 678   RemovePreTargetHandler(magnifier_key_scroll_handler_.get());
 679   magnifier_key_scroll_handler_.reset();
 680
 681   RemovePreTargetHandler(speech_feedback_handler_.get());
 682   speech_feedback_handler_.reset();
 683 #endif
 684   RemovePreTargetHandler(user_activity_detector_.get());
 685   RemovePreTargetHandler(overlay_filter_.get());
 686   RemovePreTargetHandler(input_method_filter_.get());
 687   RemovePreTargetHandler(accelerator_filter_.get());
 688   RemovePreTargetHandler(event_transformation_handler_.get());
 689   RemovePreTargetHandler(toplevel_window_event_handler_.get());
 690   RemovePostTargetHandler(toplevel_window_event_handler_.get());
 691   RemovePreTargetHandler(system_gesture_filter_.get());
 692   RemovePreTargetHandler(keyboard_metrics_filter_.get());
 693   RemovePreTargetHandler(mouse_cursor_filter_.get());
 694
 695   // TooltipController is deleted with the Shell so removing its references.
 696   RemovePreTargetHandler(tooltip_controller_.get());
 697
 698   // Destroy maximize mode controller early on since it has some observers which
 699   // need to be removed.
 700   maximize_mode_controller_->Shutdown();
 701   maximize_mode_controller_.reset();
 702
 703   // AppList needs to be released before shelf layout manager, which is
 704   // destroyed with shelf container in the loop below. However, app list
 705   // container is now on top of shelf container and released after it.
 706   // TODO(xiyuan): Move it back when app list container is no longer needed.
 707   app_list_controller_.reset();
 708
 709 #if defined(OS_CHROMEOS)
 710   // Destroy the LastWindowClosedLogoutReminder before the
 711   // LogoutConfirmationController.
 712   last_window_closed_logout_reminder_.reset();
 713
 714   // Destroy the LogoutConfirmationController before the SystemTrayDelegate.
 715   logout_confirmation_controller_.reset();
 716 #endif
 717
 718   // Destroy SystemTrayDelegate before destroying the status area(s).
 719   system_tray_delegate_->Shutdown();
 720   system_tray_delegate_.reset();
 721
 722   locale_notification_controller_.reset();
 723
 724   // Drag-and-drop must be canceled prior to close all windows.
 725   drag_drop_controller_.reset();
 726
 727   // Controllers who have WindowObserver added must be deleted
 728   // before |display_controller_| is deleted.
 729
 730 #if defined(OS_CHROMEOS)
 731   // VideoActivityNotifier must be deleted before |video_detector_| is
 732   // deleted because it's observing video activity through
 733   // VideoDetectorObserver interface.
 734   video_activity_notifier_.reset();
 735 #endif  // defined(OS_CHROMEOS)
 736   video_detector_.reset();
 737   high_contrast_controller_.reset();
 738
 739   shadow_controller_.reset();
 740   resize_shadow_controller_.reset();
 741
 742   window_cycle_controller_.reset();
 743   window_selector_controller_.reset();
 744   mru_window_tracker_.reset();
 745
 746   // |shelf_window_watcher_| has a weak pointer to |shelf_Model_|
 747   // and has window observers.
 748   shelf_window_watcher_.reset();
 749
 750   // Destroy all child windows including widgets.
 751   display_controller_->CloseChildWindows();
 752   display_controller_->CloseNonDesktopDisplay();
 753
 754   // Chrome implementation of shelf delegate depends on FocusClient,
 755   // so must be deleted before |focus_client_|.
 756   shelf_delegate_.reset();
 757   focus_client_.reset();
 758
 759   // Destroy SystemTrayNotifier after destroying SystemTray as TrayItems
 760   // needs to remove observers from it.
 761   system_tray_notifier_.reset();
 762
 763   // These need a valid Shell instance to clean up properly, so explicitly
 764   // delete them before invalidating the instance.
 765   // Alphabetical. TODO(oshima): sort.
 766   magnification_controller_.reset();
 767   partial_magnification_controller_.reset();
 768   tooltip_controller_.reset();
 769   event_client_.reset();
 770   nested_accelerator_controller_.reset();
 771   toplevel_window_event_handler_.reset();
 772   visibility_controller_.reset();
 773   // |shelf_item_delegate_manager_| observes |shelf_model_|. It must be
 774   // destroyed before |shelf_model_| is destroyed.
 775   shelf_item_delegate_manager_.reset();
 776   shelf_model_.reset();
 777
 778   power_button_controller_.reset();
 779   lock_state_controller_.reset();
 780
 781 #if defined(OS_CHROMEOS)
 782   resolution_notification_controller_.reset();
 783 #endif
 784   desktop_background_controller_.reset();
 785   mouse_cursor_filter_.reset();
 786
 787 #if defined(OS_CHROMEOS) && defined(USE_X11)
 788   touch_transformer_controller_.reset();
 789 #endif  // defined(OS_CHROMEOS) && defined(USE_X11)
 790
 791   // This also deletes all RootWindows. Note that we invoke Shutdown() on
 792   // DisplayController before resetting |display_controller_|, since destruction
 793   // of its owned RootWindowControllers relies on the value.
 794   display_manager_->CreateScreenForShutdown();
 795   display_controller_->Shutdown();
 796   display_controller_.reset();
 797   virtual_keyboard_controller_.reset();
 798   screen_position_controller_.reset();
 799   accessibility_delegate_.reset();
 800   new_window_delegate_.reset();
 801   media_delegate_.reset();
 802
 803   keyboard::KeyboardController::ResetInstance(NULL);
 804
 805 #if defined(OS_CHROMEOS)
 806   if (display_change_observer_)
 807     display_configurator_->RemoveObserver(display_change_observer_.get());
 808   if (display_configurator_animation_)
 809     display_configurator_->RemoveObserver(
 810         display_configurator_animation_.get());
 811   if (display_error_observer_)
 812     display_configurator_->RemoveObserver(display_error_observer_.get());
 813   if (projecting_observer_)
 814     display_configurator_->RemoveObserver(projecting_observer_.get());
 815   display_change_observer_.reset();
 816 #endif  // defined(OS_CHROMEOS)
 817
 818 #if defined(OS_CHROMEOS)
 819   PowerStatus::Shutdown();
 820 #endif
 821
 822   DCHECK(instance_ == this);
 823   instance_ = NULL;
 824 }
 825
 826 void Shell::Init(const ShellInitParams& init_params) {
 827   delegate_->PreInit();
 828   bool display_initialized = display_manager_->InitFromCommandLine();
 829 #if defined(OS_CHROMEOS)
 830   display_configurator_->Init(!gpu_support_->IsPanelFittingDisabled());
 831   display_configurator_animation_.reset(new DisplayConfiguratorAnimation());
 832   display_configurator_->AddObserver(display_configurator_animation_.get());
 833
 834   projecting_observer_.reset(new ProjectingObserver());
 835   display_configurator_->AddObserver(projecting_observer_.get());
 836
 837   if (!display_initialized && base::SysInfo::IsRunningOnChromeOS()) {
 838     display_change_observer_.reset(new DisplayChangeObserver);
 839     // Register |display_change_observer_| first so that the rest of
 840     // observer gets invoked after the root windows are configured.
 841     display_configurator_->AddObserver(display_change_observer_.get());
 842     display_error_observer_.reset(new DisplayErrorObserver());
 843     display_configurator_->AddObserver(display_error_observer_.get());
 844     display_configurator_->set_state_controller(display_change_observer_.get());
 845     display_configurator_->set_mirroring_controller(display_manager_.get());
 846     display_configurator_->ForceInitialConfigure(
 847         delegate_->IsFirstRunAfterBoot() ? kChromeOsBootColor : 0);
 848     display_initialized = true;
 849   }
 850 #endif  // defined(OS_CHROMEOS)
 851   if (!display_initialized)
 852     display_manager_->InitDefaultDisplay();
 853
 854   display_manager_->InitFontParams();
 855
 856   // Install the custom factory first so that views::FocusManagers for Tray,
 857   // Shelf, and WallPaper could be created by the factory.
 858   views::FocusManagerFactory::Install(new AshFocusManagerFactory);
 859
 860   aura::Env::CreateInstance(true);
 861   aura::Env::GetInstance()->set_context_factory(init_params.context_factory);
 862
 863   // The WindowModalityController needs to be at the front of the input event
 864   // pretarget handler list to ensure that it processes input events when modal
 865   // windows are active.
 866   window_modality_controller_.reset(
 867       new ::wm::WindowModalityController(this));
 868
 869   env_filter_.reset(new ::wm::CompoundEventFilter);
 870   AddPreTargetHandler(env_filter_.get());
 871
 872   ::wm::FocusController* focus_controller =
 873       new ::wm::FocusController(new wm::AshFocusRules);
 874   focus_client_.reset(focus_controller);
 875   activation_client_ = focus_controller;
 876   activation_client_->AddObserver(this);
 877   focus_cycler_.reset(new FocusCycler());
 878
 879   screen_position_controller_.reset(new ScreenPositionController);
 880
 881   display_controller_->Start();
 882   display_controller_->CreatePrimaryHost(
 883       ShellInitParamsToAshWindowTreeHostInitParams(init_params));
 884   virtual_keyboard_controller_.reset(new VirtualKeyboardController);
 885   aura::Window* root_window = display_controller_->GetPrimaryRootWindow();
 886   target_root_window_ = root_window;
 887
 888 #if defined(OS_CHROMEOS)
 889   resolution_notification_controller_.reset(
 890       new ResolutionNotificationController);
 891 #endif
 892
 893   cursor_manager_.SetDisplay(GetScreen()->GetPrimaryDisplay());
 894
 895   nested_accelerator_controller_.reset(
 896       new ::wm::NestedAcceleratorController(new NestedAcceleratorDelegate));
 897   accelerator_controller_.reset(new AcceleratorController);
 898   maximize_mode_controller_.reset(new MaximizeModeController());
 899
 900 #if defined(OS_CHROMEOS) && defined(USE_X11)
 901   magnifier_key_scroll_handler_ = MagnifierKeyScroller::CreateHandler().Pass();
 902   AddPreTargetHandler(magnifier_key_scroll_handler_.get());
 903   speech_feedback_handler_ = SpokenFeedbackToggler::CreateHandler().Pass();
 904   AddPreTargetHandler(speech_feedback_handler_.get());
 905 #endif
 906
 907   // The order in which event filters are added is significant.
 908
 909   // wm::UserActivityDetector passes events to observers, so let them get
 910   // rewritten first.
 911   user_activity_detector_.reset(new ::wm::UserActivityDetector);
 912   AddPreTargetHandler(user_activity_detector_.get());
 913
 914   overlay_filter_.reset(new OverlayEventFilter);
 915   AddPreTargetHandler(overlay_filter_.get());
 916   AddShellObserver(overlay_filter_.get());
 917
 918   input_method_filter_.reset(new ::wm::InputMethodEventFilter(
 919       root_window->GetHost()->GetAcceleratedWidget()));
 920   AddPreTargetHandler(input_method_filter_.get());
 921
 922   accelerator_filter_.reset(new ::wm::AcceleratorFilter(
 923       scoped_ptr< ::wm::AcceleratorDelegate>(new AcceleratorDelegate).Pass()));
 924   AddPreTargetHandler(accelerator_filter_.get());
 925
 926   event_transformation_handler_.reset(new EventTransformationHandler);
 927   AddPreTargetHandler(event_transformation_handler_.get());
 928
 929   toplevel_window_event_handler_.reset(new ToplevelWindowEventHandler);
 930
 931   system_gesture_filter_.reset(new SystemGestureEventFilter);
 932   AddPreTargetHandler(system_gesture_filter_.get());
 933
 934   keyboard_metrics_filter_.reset(new KeyboardUMAEventFilter);
 935   AddPreTargetHandler(keyboard_metrics_filter_.get());
 936
 937   // The keyboard system must be initialized before the RootWindowController is
 938   // created.
 939 #if defined(OS_CHROMEOS)
 940     keyboard::InitializeKeyboard();
 941 #endif
 942
 943 #if defined(OS_CHROMEOS)
 944   sticky_keys_controller_.reset(new StickyKeysController);
 945 #endif
 946
 947   lock_state_controller_.reset(new LockStateController);
 948   power_button_controller_.reset(new PowerButtonController(
 949       lock_state_controller_.get()));
 950 #if defined(OS_CHROMEOS)
 951   // Pass the initial display state to PowerButtonController.
 952   power_button_controller_->OnDisplayModeChanged(
 953       display_configurator_->cached_displays());
 954 #endif
 955   AddShellObserver(lock_state_controller_.get());
 956
 957   drag_drop_controller_.reset(new DragDropController);
 958   mouse_cursor_filter_.reset(new MouseCursorEventFilter());
 959   PrependPreTargetHandler(mouse_cursor_filter_.get());
 960
 961   // Create Controllers that may need root window.
 962   // TODO(oshima): Move as many controllers before creating
 963   // RootWindowController as possible.
 964   visibility_controller_.reset(new AshVisibilityController);
 965
 966   magnification_controller_.reset(
 967       MagnificationController::CreateInstance());
 968   mru_window_tracker_.reset(new MruWindowTracker(activation_client_));
 969
 970   partial_magnification_controller_.reset(
 971       new PartialMagnificationController());
 972
 973   autoclick_controller_.reset(AutoclickController::CreateInstance());
 974
 975   high_contrast_controller_.reset(new HighContrastController);
 976   video_detector_.reset(new VideoDetector);
 977   window_selector_controller_.reset(new WindowSelectorController());
 978   window_cycle_controller_.reset(new WindowCycleController());
 979
 980   tooltip_controller_.reset(
 981       new views::corewm::TooltipController(
 982           scoped_ptr<views::corewm::Tooltip>(
 983               new views::corewm::TooltipAura(gfx::SCREEN_TYPE_ALTERNATE))));
 984   AddPreTargetHandler(tooltip_controller_.get());
 985
 986   event_client_.reset(new EventClientImpl);
 987
 988   // This controller needs to be set before SetupManagedWindowMode.
 989   desktop_background_controller_.reset(new DesktopBackgroundController());
 990   user_wallpaper_delegate_.reset(delegate_->CreateUserWallpaperDelegate());
 991
 992   session_state_delegate_.reset(delegate_->CreateSessionStateDelegate());
 993   accessibility_delegate_.reset(delegate_->CreateAccessibilityDelegate());
 994   new_window_delegate_.reset(delegate_->CreateNewWindowDelegate());
 995   media_delegate_.reset(delegate_->CreateMediaDelegate());
 996
 997   resize_shadow_controller_.reset(new ResizeShadowController());
 998   shadow_controller_.reset(
 999       new ::wm::ShadowController(activation_client_));
1000
1001   // Create system_tray_notifier_ before the delegate.
1002   system_tray_notifier_.reset(new ash::SystemTrayNotifier());
1003
1004   // Initialize system_tray_delegate_ before initializing StatusAreaWidget.
1005   system_tray_delegate_.reset(delegate()->CreateSystemTrayDelegate());
1006   DCHECK(system_tray_delegate_.get());
1007
1008   locale_notification_controller_.reset(new LocaleNotificationController);
1009
1010   // Initialize system_tray_delegate_ after StatusAreaWidget is created.
1011   system_tray_delegate_->Initialize();
1012
1013 #if defined(OS_CHROMEOS)
1014   // Create the LogoutConfirmationController after the SystemTrayDelegate.
1015   logout_confirmation_controller_.reset(new LogoutConfirmationController(
1016       base::Bind(&SystemTrayDelegate::SignOut,
1017                  base::Unretained(system_tray_delegate_.get()))));
1018 #endif
1019
1020 #if defined(OS_CHROMEOS) && defined(USE_X11)
1021   // Create TouchTransformerController before DisplayController::InitDisplays()
1022   // since TouchTransformerController listens on
1023   // DisplayController::Observer::OnDisplaysInitialized().
1024   touch_transformer_controller_.reset(new TouchTransformerController());
1025 #endif  // defined(OS_CHROMEOS) && defined(USE_X11)
1026
1027   display_controller_->InitDisplays();
1028
1029   // It needs to be created after RootWindowController has been created
1030   // (which calls OnWindowResized has been called, otherwise the
1031   // widget will not paint when restoring after a browser crash.  Also it needs
1032   // to be created after InitSecondaryDisplays() to initialize the wallpapers in
1033   // the correct size.
1034   user_wallpaper_delegate_->InitializeWallpaper();
1035
1036   if (initially_hide_cursor_)
1037     cursor_manager_.HideCursor();
1038   cursor_manager_.SetCursor(ui::kCursorPointer);
1039
1040 #if defined(OS_CHROMEOS)
1041   // Set accelerator controller delegates.
1042   accelerator_controller_->SetBrightnessControlDelegate(
1043       scoped_ptr<ash::BrightnessControlDelegate>(
1044           new ash::system::BrightnessControllerChromeos).Pass());
1045
1046   power_event_observer_.reset(new PowerEventObserver());
1047   user_activity_notifier_.reset(
1048       new ui::UserActivityPowerManagerNotifier(user_activity_detector_.get()));
1049   video_activity_notifier_.reset(
1050       new VideoActivityNotifier(video_detector_.get()));
1051   bluetooth_notification_controller_.reset(new BluetoothNotificationController);
1052   last_window_closed_logout_reminder_.reset(new LastWindowClosedLogoutReminder);
1053 #endif
1054
1055   weak_display_manager_factory_.reset(
1056       new base::WeakPtrFactory<DisplayManager>(display_manager_.get()));
1057   // The compositor thread and main message loop have to be running in
1058   // order to create mirror window. Run it after the main message loop
1059   // is started.
1060   base::MessageLoopForUI::current()->PostTask(
1061       FROM_HERE,
1062       base::Bind(&DisplayManager::CreateMirrorWindowIfAny,
1063                  weak_display_manager_factory_->GetWeakPtr()));
1064 }
1065
1066 void Shell::InitKeyboard() {
1067   if (keyboard::IsKeyboardEnabled()) {
1068     if (keyboard::KeyboardController::GetInstance()) {
1069       RootWindowControllerList controllers = GetAllRootWindowControllers();
1070       for (RootWindowControllerList::iterator iter = controllers.begin();
1071            iter != controllers.end(); ++iter) {
1072         (*iter)->DeactivateKeyboard(
1073             keyboard::KeyboardController::GetInstance());
1074       }
1075     }
1076     keyboard::KeyboardControllerProxy* proxy =
1077         delegate_->CreateKeyboardControllerProxy();
1078     keyboard::KeyboardController::ResetInstance(
1079         new keyboard::KeyboardController(proxy));
1080   }
1081 }
1082
1083 void Shell::InitRootWindow(aura::Window* root_window) {
1084   DCHECK(activation_client_);
1085   DCHECK(visibility_controller_.get());
1086   DCHECK(drag_drop_controller_.get());
1087
1088   aura::client::SetFocusClient(root_window, focus_client_.get());
1089   input_method_filter_->SetInputMethodPropertyInRootWindow(root_window);
1090   aura::client::SetActivationClient(root_window, activation_client_);
1091   ::wm::FocusController* focus_controller =
1092       static_cast< ::wm::FocusController*>(activation_client_);
1093   root_window->AddPreTargetHandler(focus_controller);
1094   aura::client::SetVisibilityClient(root_window, visibility_controller_.get());
1095   aura::client::SetDragDropClient(root_window, drag_drop_controller_.get());
1096   aura::client::SetScreenPositionClient(root_window,
1097                                         screen_position_controller_.get());
1098   aura::client::SetCursorClient(root_window, &cursor_manager_);
1099   aura::client::SetTooltipClient(root_window, tooltip_controller_.get());
1100   aura::client::SetEventClient(root_window, event_client_.get());
1101
1102   aura::client::SetWindowMoveClient(root_window,
1103       toplevel_window_event_handler_.get());
1104   root_window->AddPreTargetHandler(toplevel_window_event_handler_.get());
1105   root_window->AddPostTargetHandler(toplevel_window_event_handler_.get());
1106
1107   if (nested_accelerator_controller_) {
1108     aura::client::SetDispatcherClient(root_window,
1109                                       nested_accelerator_controller_.get());
1110   }
1111 }
1112
1113 bool Shell::CanWindowReceiveEvents(aura::Window* window) {
1114   RootWindowControllerList controllers = GetAllRootWindowControllers();
1115   for (RootWindowControllerList::iterator iter = controllers.begin();
1116        iter != controllers.end(); ++iter) {
1117     SystemModalContainerLayoutManager* layout_manager =
1118         (*iter)->GetSystemModalLayoutManager(window);
1119     if (layout_manager && layout_manager->CanWindowReceiveEvents(window))
1120       return true;
1121     // Allow events to fall through to the virtual keyboard even if displaying
1122     // a system modal dialog.
1123     if ((*iter)->IsVirtualKeyboardWindow(window))
1124       return true;
1125   }
1126
1127   return false;
1128 }
1129
1130 ////////////////////////////////////////////////////////////////////////////////
1131 // Shell, ui::EventTarget overrides:
1132
1133 bool Shell::CanAcceptEvent(const ui::Event& event) {
1134   return true;
1135 }
1136
1137 ui::EventTarget* Shell::GetParentTarget() {
1138   return aura::Env::GetInstance();
1139 }
1140
1141 scoped_ptr<ui::EventTargetIterator> Shell::GetChildIterator() const {
1142   return scoped_ptr<ui::EventTargetIterator>();
1143 }
1144
1145 ui::EventTargeter* Shell::GetEventTargeter() {
1146   NOTREACHED();
1147   return NULL;
1148 }
1149
1150 void Shell::OnEvent(ui::Event* event) {
1151 }
1152
1153 ////////////////////////////////////////////////////////////////////////////////
1154 // Shell, aura::client::ActivationChangeObserver implementation:
1155
1156 void Shell::OnWindowActivated(aura::Window* gained_active,
1157                               aura::Window* lost_active) {
1158   if (gained_active)
1159     target_root_window_ = gained_active->GetRootWindow();
1160 }
1161
1162 }  // namespace ash