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/ash_switches.h"
  15 #include "ash/autoclick/autoclick_controller.h"
  16 #include "ash/desktop_background/desktop_background_controller.h"
  17 #include "ash/desktop_background/desktop_background_view.h"
  18 #include "ash/desktop_background/user_wallpaper_delegate.h"
  19 #include "ash/display/cursor_window_controller.h"
  20 #include "ash/display/display_controller.h"
  21 #include "ash/display/display_manager.h"
  22 #include "ash/display/event_transformation_handler.h"
  23 #include "ash/display/mouse_cursor_event_filter.h"
  24 #include "ash/display/screen_position_controller.h"
  25 #include "ash/drag_drop/drag_drop_controller.h"
  26 #include "ash/first_run/first_run_helper_impl.h"
  27 #include "ash/focus_cycler.h"
  28 #include "ash/frame/custom_frame_view_ash.h"
  29 #include "ash/gpu_support.h"
  30 #include "ash/high_contrast/high_contrast_controller.h"
  31 #include "ash/host/ash_window_tree_host_init_params.h"
  32 #include "ash/keyboard_uma_event_filter.h"
  33 #include "ash/magnifier/magnification_controller.h"
  34 #include "ash/magnifier/partial_magnification_controller.h"
  35 #include "ash/media_delegate.h"
  36 #include "ash/new_window_delegate.h"
  37 #include "ash/root_window_controller.h"
  38 #include "ash/session/session_state_delegate.h"
  39 #include "ash/shelf/app_list_shelf_item_delegate.h"
  40 #include "ash/shelf/shelf_delegate.h"
  41 #include "ash/shelf/shelf_item_delegate.h"
  42 #include "ash/shelf/shelf_item_delegate_manager.h"
  43 #include "ash/shelf/shelf_layout_manager.h"
  44 #include "ash/shelf/shelf_model.h"
  45 #include "ash/shelf/shelf_widget.h"
  46 #include "ash/shelf/shelf_window_watcher.h"
  47 #include "ash/shell_delegate.h"
  48 #include "ash/shell_factory.h"
  49 #include "ash/shell_init_params.h"
  50 #include "ash/shell_window_ids.h"
  51 #include "ash/system/locale/locale_notification_controller.h"
  52 #include "ash/system/status_area_widget.h"
  53 #include "ash/system/tray/system_tray_delegate.h"
  54 #include "ash/system/tray/system_tray_notifier.h"
  55 #include "ash/wm/app_list_controller.h"
  56 #include "ash/wm/ash_focus_rules.h"
  57 #include "ash/wm/ash_native_cursor_manager.h"
  58 #include "ash/wm/coordinate_conversion.h"
  59 #include "ash/wm/event_client_impl.h"
  60 #include "ash/wm/lock_state_controller.h"
  61 #include "ash/wm/maximize_mode/maximize_mode_controller.h"
  62 #include "ash/wm/maximize_mode/maximize_mode_window_manager.h"
  63 #include "ash/wm/mru_window_tracker.h"
  64 #include "ash/wm/overlay_event_filter.h"
  65 #include "ash/wm/overview/window_selector_controller.h"
  66 #include "ash/wm/power_button_controller.h"
  67 #include "ash/wm/resize_shadow_controller.h"
  68 #include "ash/wm/root_window_layout_manager.h"
  69 #include "ash/wm/screen_dimmer.h"
  70 #include "ash/wm/system_gesture_event_filter.h"
  71 #include "ash/wm/system_modal_container_event_filter.h"
  72 #include "ash/wm/system_modal_container_layout_manager.h"
  73 #include "ash/wm/toplevel_window_event_handler.h"
  74 #include "ash/wm/video_detector.h"
  75 #include "ash/wm/window_animations.h"
  76 #include "ash/wm/window_cycle_controller.h"
  77 #include "ash/wm/window_positioner.h"
  78 #include "ash/wm/window_properties.h"
  79 #include "ash/wm/window_util.h"
  80 #include "ash/wm/workspace_controller.h"
  81 #include "base/bind.h"
  82 #include "base/debug/trace_event.h"
  83 #include "ui/aura/client/aura_constants.h"
  84 #include "ui/aura/env.h"
  85 #include "ui/aura/layout_manager.h"
  86 #include "ui/aura/window.h"
  87 #include "ui/aura/window_event_dispatcher.h"
  88 #include "ui/base/ui_base_switches.h"
  89 #include "ui/base/user_activity/user_activity_detector.h"
  90 #include "ui/compositor/layer.h"
  91 #include "ui/compositor/layer_animator.h"
  92 #include "ui/events/event_target_iterator.h"
  93 #include "ui/gfx/display.h"
  94 #include "ui/gfx/geometry/size.h"
  95 #include "ui/gfx/image/image_skia.h"
  96 #include "ui/gfx/screen.h"
  97 #include "ui/keyboard/keyboard.h"
  98 #include "ui/keyboard/keyboard_controller.h"
  99 #include "ui/keyboard/keyboard_switches.h"
 100 #include "ui/keyboard/keyboard_util.h"
 101 #include "ui/message_center/message_center.h"
 102 #include "ui/views/corewm/tooltip_aura.h"
 103 #include "ui/views/corewm/tooltip_controller.h"
 104 #include "ui/views/focus/focus_manager_factory.h"
 105 #include "ui/views/widget/native_widget_aura.h"
 106 #include "ui/views/widget/widget.h"
 107 #include "ui/wm/core/accelerator_filter.h"
 108 #include "ui/wm/core/compound_event_filter.h"
 109 #include "ui/wm/core/focus_controller.h"
 110 #include "ui/wm/core/input_method_event_filter.h"
 111 #include "ui/wm/core/nested_accelerator_controller.h"
 112 #include "ui/wm/core/shadow_controller.h"
 113 #include "ui/wm/core/visibility_controller.h"
 114 #include "ui/wm/core/window_modality_controller.h"
 115
 116 #if defined(OS_CHROMEOS)
 117 #if defined(USE_X11)
 118 #include "ui/gfx/x/x11_types.h"
 119 #endif  // defined(USE_X11)
 120 #include "ash/accelerators/magnifier_key_scroller.h"
 121 #include "ash/accelerators/spoken_feedback_toggler.h"
 122 #include "ash/ash_constants.h"
 123 #include "ash/content/display/screen_orientation_controller_chromeos.h"
 124 #include "ash/display/display_change_observer_chromeos.h"
 125 #include "ash/display/display_configurator_animation.h"
 126 #include "ash/display/display_error_observer_chromeos.h"
 127 #include "ash/display/projecting_observer_chromeos.h"
 128 #include "ash/display/resolution_notification_controller.h"
 129 #include "ash/sticky_keys/sticky_keys_controller.h"
 130 #include "ash/system/chromeos/bluetooth/bluetooth_notification_controller.h"
 131 #include "ash/system/chromeos/brightness/brightness_controller_chromeos.h"
 132 #include "ash/system/chromeos/power/power_event_observer.h"
 133 #include "ash/system/chromeos/power/power_status.h"
 134 #include "ash/system/chromeos/power/video_activity_notifier.h"
 135 #include "ash/system/chromeos/session/last_window_closed_logout_reminder.h"
 136 #include "ash/system/chromeos/session/logout_confirmation_controller.h"
 137 #include "ash/touch/touch_transformer_controller.h"
 138 #include "ash/virtual_keyboard_controller.h"
 139 #include "base/bind_helpers.h"
 140 #include "base/sys_info.h"
 141 #include "chromeos/dbus/dbus_thread_manager.h"
 142 #include "ui/chromeos/user_activity_power_manager_notifier.h"
 143 #include "ui/display/chromeos/display_configurator.h"
 144 #endif  // defined(OS_CHROMEOS)
 145
 146 namespace ash {
 147
 148 namespace {
 149
 150 using aura::Window;
 151 using views::Widget;
 152
 153 // A Corewm VisibilityController subclass that calls the Ash animation routine
 154 // so we can pick up our extended animations. See ash/wm/window_animations.h.
 155 class AshVisibilityController : public ::wm::VisibilityController {
 156  public:
 157   AshVisibilityController() {}
 158   ~AshVisibilityController() override {}
 159
 160  private:
 161   // Overridden from ::wm::VisibilityController:
 162   bool CallAnimateOnChildWindowVisibilityChanged(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)
 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::OnOverviewModeEnded() {
 423   FOR_EACH_OBSERVER(ShellObserver, observers_, OnOverviewModeEnded());
 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 !(screen_orientation_controller_
 488                ->ignore_display_configuration_updates() ||
 489            resolution_notification_controller_->DoesNotificationTimeout());
 490 }
 491 #endif
 492
 493 void Shell::UpdateShelfVisibility() {
 494   RootWindowControllerList controllers = GetAllRootWindowControllers();
 495   for (RootWindowControllerList::iterator iter = controllers.begin();
 496        iter != controllers.end(); ++iter)
 497     if ((*iter)->shelf())
 498       (*iter)->UpdateShelfVisibility();
 499 }
 500
 501 void Shell::SetShelfAutoHideBehavior(ShelfAutoHideBehavior behavior,
 502                                      aura::Window* root_window) {
 503   ash::ShelfLayoutManager::ForShelf(root_window)->SetAutoHideBehavior(behavior);
 504 }
 505
 506 ShelfAutoHideBehavior Shell::GetShelfAutoHideBehavior(
 507     aura::Window* root_window) const {
 508   return ash::ShelfLayoutManager::ForShelf(root_window)->auto_hide_behavior();
 509 }
 510
 511 void Shell::SetShelfAlignment(ShelfAlignment alignment,
 512                               aura::Window* root_window) {
 513   if (ash::ShelfLayoutManager::ForShelf(root_window)->SetAlignment(alignment)) {
 514     FOR_EACH_OBSERVER(
 515         ShellObserver, observers_, OnShelfAlignmentChanged(root_window));
 516   }
 517 }
 518
 519 ShelfAlignment Shell::GetShelfAlignment(const aura::Window* root_window) {
 520   return GetRootWindowController(root_window)
 521       ->GetShelfLayoutManager()
 522       ->GetAlignment();
 523 }
 524
 525 void Shell::SetDimming(bool should_dim) {
 526   RootWindowControllerList controllers = GetAllRootWindowControllers();
 527   for (RootWindowControllerList::iterator iter = controllers.begin();
 528        iter != controllers.end(); ++iter)
 529     (*iter)->screen_dimmer()->SetDimming(should_dim);
 530 }
 531
 532 void Shell::NotifyFullscreenStateChange(bool is_fullscreen,
 533                                         aura::Window* root_window) {
 534   FOR_EACH_OBSERVER(ShellObserver, observers_, OnFullscreenStateChanged(
 535       is_fullscreen, root_window));
 536 }
 537
 538 void Shell::CreateModalBackground(aura::Window* window) {
 539   if (!modality_filter_) {
 540     modality_filter_.reset(new SystemModalContainerEventFilter(this));
 541     AddPreTargetHandler(modality_filter_.get());
 542   }
 543   RootWindowControllerList controllers = GetAllRootWindowControllers();
 544   for (RootWindowControllerList::iterator iter = controllers.begin();
 545        iter != controllers.end(); ++iter)
 546     (*iter)->GetSystemModalLayoutManager(window)->CreateModalBackground();
 547 }
 548
 549 void Shell::OnModalWindowRemoved(aura::Window* removed) {
 550   RootWindowControllerList controllers = GetAllRootWindowControllers();
 551   bool activated = false;
 552   for (RootWindowControllerList::iterator iter = controllers.begin();
 553        iter != controllers.end() && !activated; ++iter) {
 554     activated = (*iter)->GetSystemModalLayoutManager(removed)->
 555         ActivateNextModalWindow();
 556   }
 557   if (!activated) {
 558     RemovePreTargetHandler(modality_filter_.get());
 559     modality_filter_.reset();
 560     for (RootWindowControllerList::iterator iter = controllers.begin();
 561          iter != controllers.end(); ++iter)
 562       (*iter)->GetSystemModalLayoutManager(removed)->DestroyModalBackground();
 563   }
 564 }
 565
 566 WebNotificationTray* Shell::GetWebNotificationTray() {
 567   return GetPrimaryRootWindowController()->shelf()->
 568       status_area_widget()->web_notification_tray();
 569 }
 570
 571 bool Shell::HasPrimaryStatusArea() {
 572   ShelfWidget* shelf = GetPrimaryRootWindowController()->shelf();
 573   return shelf && shelf->status_area_widget();
 574 }
 575
 576 SystemTray* Shell::GetPrimarySystemTray() {
 577   return GetPrimaryRootWindowController()->GetSystemTray();
 578 }
 579
 580 ShelfDelegate* Shell::GetShelfDelegate() {
 581   if (!shelf_delegate_) {
 582     shelf_model_.reset(new ShelfModel);
 583     // Creates ShelfItemDelegateManager before ShelfDelegate.
 584     shelf_item_delegate_manager_.reset(
 585         new ShelfItemDelegateManager(shelf_model_.get()));
 586
 587     shelf_delegate_.reset(delegate_->CreateShelfDelegate(shelf_model_.get()));
 588     scoped_ptr<ShelfItemDelegate> controller(new AppListShelfItemDelegate);
 589
 590     // Finding the shelf model's location of the app list and setting its
 591     // ShelfItemDelegate.
 592     int app_list_index = shelf_model_->GetItemIndexForType(TYPE_APP_LIST);
 593     DCHECK_GE(app_list_index, 0);
 594     ShelfID app_list_id = shelf_model_->items()[app_list_index].id;
 595     DCHECK(app_list_id);
 596     shelf_item_delegate_manager_->SetShelfItemDelegate(app_list_id,
 597                                                        controller.Pass());
 598     shelf_window_watcher_.reset(new ShelfWindowWatcher(
 599         shelf_model_.get(), shelf_item_delegate_manager_.get()));
 600   }
 601   return shelf_delegate_.get();
 602 }
 603
 604 void Shell::SetTouchHudProjectionEnabled(bool enabled) {
 605   if (is_touch_hud_projection_enabled_ == enabled)
 606     return;
 607
 608   is_touch_hud_projection_enabled_ = enabled;
 609   FOR_EACH_OBSERVER(ShellObserver, observers_,
 610                     OnTouchHudProjectionToggled(enabled));
 611 }
 612
 613 #if defined(OS_CHROMEOS)
 614 ash::FirstRunHelper* Shell::CreateFirstRunHelper() {
 615   return new ash::FirstRunHelperImpl;
 616 }
 617
 618 void Shell::SetCursorCompositingEnabled(bool enabled) {
 619   display_controller_->cursor_window_controller()->SetCursorCompositingEnabled(
 620       enabled);
 621   native_cursor_manager_->SetNativeCursorEnabled(!enabled);
 622 }
 623 #endif  // defined(OS_CHROMEOS)
 624
 625 void Shell::DoInitialWorkspaceAnimation() {
 626   return GetPrimaryRootWindowController()->workspace_controller()->
 627       DoInitialAnimation();
 628 }
 629
 630 ////////////////////////////////////////////////////////////////////////////////
 631 // Shell, private:
 632
 633 Shell::Shell(ShellDelegate* delegate)
 634     : target_root_window_(NULL),
 635       scoped_target_root_window_(NULL),
 636       delegate_(delegate),
 637       window_positioner_(new WindowPositioner),
 638       activation_client_(NULL),
 639 #if defined(OS_CHROMEOS)
 640       display_configurator_(new ui::DisplayConfigurator()),
 641 #endif  // defined(OS_CHROMEOS)
 642       native_cursor_manager_(new AshNativeCursorManager),
 643       cursor_manager_(
 644           scoped_ptr<::wm::NativeCursorManager>(native_cursor_manager_)),
 645       simulate_modal_window_open_for_testing_(false),
 646       is_touch_hud_projection_enabled_(false) {
 647   DCHECK(delegate_.get());
 648   gpu_support_.reset(delegate_->CreateGPUSupport());
 649   display_manager_.reset(new DisplayManager);
 650   display_controller_.reset(new DisplayController);
 651   user_metrics_recorder_.reset(new UserMetricsRecorder);
 652
 653 #if defined(OS_CHROMEOS)
 654   PowerStatus::Initialize();
 655 #endif
 656 }
 657
 658 Shell::~Shell() {
 659   TRACE_EVENT0("shutdown", "ash::Shell::Destructor");
 660
 661   delegate_->PreShutdown();
 662
 663   views::FocusManagerFactory::Install(NULL);
 664
 665   // Remove the focus from any window. This will prevent overhead and side
 666   // effects (e.g. crashes) from changing focus during shutdown.
 667   // See bug crbug.com/134502.
 668   aura::client::GetFocusClient(GetPrimaryRootWindow())->FocusWindow(NULL);
 669
 670   // Please keep in same order as in Init() because it's easy to miss one.
 671   if (window_modality_controller_)
 672     window_modality_controller_.reset();
 673 #if defined(OS_CHROMEOS)
 674   RemovePreTargetHandler(magnifier_key_scroll_handler_.get());
 675   magnifier_key_scroll_handler_.reset();
 676
 677   RemovePreTargetHandler(speech_feedback_handler_.get());
 678   speech_feedback_handler_.reset();
 679 #endif
 680   RemovePreTargetHandler(user_activity_detector_.get());
 681   RemovePreTargetHandler(overlay_filter_.get());
 682   RemovePreTargetHandler(input_method_filter_.get());
 683   RemovePreTargetHandler(accelerator_filter_.get());
 684   RemovePreTargetHandler(event_transformation_handler_.get());
 685   RemovePreTargetHandler(toplevel_window_event_handler_.get());
 686   RemovePostTargetHandler(toplevel_window_event_handler_.get());
 687   RemovePreTargetHandler(system_gesture_filter_.get());
 688   RemovePreTargetHandler(keyboard_metrics_filter_.get());
 689   RemovePreTargetHandler(mouse_cursor_filter_.get());
 690
 691   // TooltipController is deleted with the Shell so removing its references.
 692   RemovePreTargetHandler(tooltip_controller_.get());
 693
 694 #if defined(OS_CHROMEOS)
 695   screen_orientation_controller_.reset();
 696 #endif
 697
 698 // Destroy the virtual keyboard controller before the maximize mode controller
 699 // since the latters destructor triggers events that the former is listening
 700 // to but no longer cares about.
 701 #if defined(OS_CHROMEOS)
 702   virtual_keyboard_controller_.reset();
 703 #endif
 704
 705   // Destroy maximize mode controller early on since it has some observers which
 706   // need to be removed.
 707   maximize_mode_controller_.reset();
 708
 709   // AppList needs to be released before shelf layout manager, which is
 710   // destroyed with shelf container in the loop below. However, app list
 711   // container is now on top of shelf container and released after it.
 712   // TODO(xiyuan): Move it back when app list container is no longer needed.
 713   app_list_controller_.reset();
 714
 715 #if defined(OS_CHROMEOS)
 716   // Destroy the LastWindowClosedLogoutReminder before the
 717   // LogoutConfirmationController.
 718   last_window_closed_logout_reminder_.reset();
 719
 720   // Destroy the LogoutConfirmationController before the SystemTrayDelegate.
 721   logout_confirmation_controller_.reset();
 722 #endif
 723
 724   // Destroy SystemTrayDelegate before destroying the status area(s).
 725   system_tray_delegate_->Shutdown();
 726   system_tray_delegate_.reset();
 727
 728   locale_notification_controller_.reset();
 729
 730   // Drag-and-drop must be canceled prior to close all windows.
 731   drag_drop_controller_.reset();
 732
 733   // Controllers who have WindowObserver added must be deleted
 734   // before |display_controller_| is deleted.
 735
 736 #if defined(OS_CHROMEOS)
 737   // VideoActivityNotifier must be deleted before |video_detector_| is
 738   // deleted because it's observing video activity through
 739   // VideoDetectorObserver interface.
 740   video_activity_notifier_.reset();
 741 #endif  // defined(OS_CHROMEOS)
 742   video_detector_.reset();
 743   high_contrast_controller_.reset();
 744
 745   shadow_controller_.reset();
 746   resize_shadow_controller_.reset();
 747
 748   window_cycle_controller_.reset();
 749   window_selector_controller_.reset();
 750   mru_window_tracker_.reset();
 751
 752   // |shelf_window_watcher_| has a weak pointer to |shelf_Model_|
 753   // and has window observers.
 754   shelf_window_watcher_.reset();
 755
 756   // Destroy all child windows including widgets.
 757   display_controller_->CloseChildWindows();
 758   display_controller_->CloseMirroringDisplay();
 759
 760   // Chrome implementation of shelf delegate depends on FocusClient,
 761   // so must be deleted before |focus_client_|.
 762   shelf_delegate_.reset();
 763   focus_client_.reset();
 764
 765   // Destroy SystemTrayNotifier after destroying SystemTray as TrayItems
 766   // needs to remove observers from it.
 767   system_tray_notifier_.reset();
 768
 769   // These need a valid Shell instance to clean up properly, so explicitly
 770   // delete them before invalidating the instance.
 771   // Alphabetical. TODO(oshima): sort.
 772   magnification_controller_.reset();
 773   partial_magnification_controller_.reset();
 774   tooltip_controller_.reset();
 775   event_client_.reset();
 776   nested_accelerator_controller_.reset();
 777   toplevel_window_event_handler_.reset();
 778   visibility_controller_.reset();
 779   // |shelf_item_delegate_manager_| observes |shelf_model_|. It must be
 780   // destroyed before |shelf_model_| is destroyed.
 781   shelf_item_delegate_manager_.reset();
 782   shelf_model_.reset();
 783
 784   power_button_controller_.reset();
 785   lock_state_controller_.reset();
 786
 787 #if defined(OS_CHROMEOS)
 788   resolution_notification_controller_.reset();
 789 #endif
 790   desktop_background_controller_.reset();
 791   mouse_cursor_filter_.reset();
 792
 793 #if defined(OS_CHROMEOS)
 794   touch_transformer_controller_.reset();
 795 #endif  // defined(OS_CHROMEOS)
 796
 797   // This also deletes all RootWindows. Note that we invoke Shutdown() on
 798   // DisplayController before resetting |display_controller_|, since destruction
 799   // of its owned RootWindowControllers relies on the value.
 800   display_manager_->CreateScreenForShutdown();
 801   display_controller_->Shutdown();
 802   display_controller_.reset();
 803   screen_position_controller_.reset();
 804   accessibility_delegate_.reset();
 805   new_window_delegate_.reset();
 806   media_delegate_.reset();
 807
 808   keyboard::KeyboardController::ResetInstance(NULL);
 809
 810 #if defined(OS_CHROMEOS)
 811   if (display_change_observer_)
 812     display_configurator_->RemoveObserver(display_change_observer_.get());
 813   if (display_configurator_animation_)
 814     display_configurator_->RemoveObserver(
 815         display_configurator_animation_.get());
 816   if (display_error_observer_)
 817     display_configurator_->RemoveObserver(display_error_observer_.get());
 818   if (projecting_observer_)
 819     display_configurator_->RemoveObserver(projecting_observer_.get());
 820   display_change_observer_.reset();
 821
 822   PowerStatus::Shutdown();
 823
 824   // Ensure that DBusThreadManager outlives this Shell.
 825   DCHECK(chromeos::DBusThreadManager::IsInitialized());
 826 #endif
 827
 828   DCHECK(instance_ == this);
 829   instance_ = NULL;
 830 }
 831
 832 void Shell::Init(const ShellInitParams& init_params) {
 833   delegate_->PreInit();
 834   bool display_initialized = display_manager_->InitFromCommandLine();
 835 #if defined(OS_CHROMEOS)
 836   display_configurator_->Init(!gpu_support_->IsPanelFittingDisabled());
 837   display_configurator_animation_.reset(new DisplayConfiguratorAnimation());
 838   display_configurator_->AddObserver(display_configurator_animation_.get());
 839
 840   // The DBusThreadManager must outlive this Shell. See the DCHECK in ~Shell.
 841   chromeos::DBusThreadManager* dbus_thread_manager =
 842       chromeos::DBusThreadManager::Get();
 843   projecting_observer_.reset(
 844       new ProjectingObserver(dbus_thread_manager->GetPowerManagerClient()));
 845   display_configurator_->AddObserver(projecting_observer_.get());
 846
 847   if (!display_initialized && base::SysInfo::IsRunningOnChromeOS()) {
 848     display_change_observer_.reset(new DisplayChangeObserver);
 849     // Register |display_change_observer_| first so that the rest of
 850     // observer gets invoked after the root windows are configured.
 851     display_configurator_->AddObserver(display_change_observer_.get());
 852     display_error_observer_.reset(new DisplayErrorObserver());
 853     display_configurator_->AddObserver(display_error_observer_.get());
 854     display_configurator_->set_state_controller(display_change_observer_.get());
 855     display_configurator_->set_mirroring_controller(display_manager_.get());
 856     display_configurator_->ForceInitialConfigure(
 857         delegate_->IsFirstRunAfterBoot() ? kChromeOsBootColor : 0);
 858     display_initialized = true;
 859   }
 860 #endif  // defined(OS_CHROMEOS)
 861   if (!display_initialized)
 862     display_manager_->InitDefaultDisplay();
 863
 864   display_manager_->RefreshFontParams();
 865
 866   // Install the custom factory first so that views::FocusManagers for Tray,
 867   // Shelf, and WallPaper could be created by the factory.
 868   views::FocusManagerFactory::Install(new AshFocusManagerFactory);
 869
 870   aura::Env::CreateInstance(true);
 871   aura::Env::GetInstance()->set_context_factory(init_params.context_factory);
 872
 873   // The WindowModalityController needs to be at the front of the input event
 874   // pretarget handler list to ensure that it processes input events when modal
 875   // windows are active.
 876   window_modality_controller_.reset(
 877       new ::wm::WindowModalityController(this));
 878
 879   env_filter_.reset(new ::wm::CompoundEventFilter);
 880   AddPreTargetHandler(env_filter_.get());
 881
 882   wm::AshFocusRules* focus_rules = new wm::AshFocusRules();
 883
 884   ::wm::FocusController* focus_controller =
 885       new ::wm::FocusController(focus_rules);
 886   focus_client_.reset(focus_controller);
 887   activation_client_ = focus_controller;
 888   activation_client_->AddObserver(this);
 889   focus_cycler_.reset(new FocusCycler());
 890
 891   screen_position_controller_.reset(new ScreenPositionController);
 892
 893   display_controller_->Start();
 894   display_controller_->CreatePrimaryHost(
 895       ShellInitParamsToAshWindowTreeHostInitParams(init_params));
 896   aura::Window* root_window = display_controller_->GetPrimaryRootWindow();
 897   target_root_window_ = root_window;
 898
 899 #if defined(OS_CHROMEOS)
 900   resolution_notification_controller_.reset(
 901       new ResolutionNotificationController);
 902 #endif
 903
 904   cursor_manager_.SetDisplay(GetScreen()->GetPrimaryDisplay());
 905
 906   nested_accelerator_controller_.reset(
 907       new ::wm::NestedAcceleratorController(new NestedAcceleratorDelegate));
 908   accelerator_controller_.reset(new AcceleratorController);
 909   maximize_mode_controller_.reset(new MaximizeModeController());
 910
 911 #if defined(OS_CHROMEOS)
 912   magnifier_key_scroll_handler_ = MagnifierKeyScroller::CreateHandler();
 913   AddPreTargetHandler(magnifier_key_scroll_handler_.get());
 914   speech_feedback_handler_ = SpokenFeedbackToggler::CreateHandler();
 915   AddPreTargetHandler(speech_feedback_handler_.get());
 916 #endif
 917
 918   // The order in which event filters are added is significant.
 919
 920   // ui::UserActivityDetector passes events to observers, so let them get
 921   // rewritten first.
 922   user_activity_detector_.reset(new ui::UserActivityDetector);
 923   AddPreTargetHandler(user_activity_detector_.get());
 924
 925   overlay_filter_.reset(new OverlayEventFilter);
 926   AddPreTargetHandler(overlay_filter_.get());
 927   AddShellObserver(overlay_filter_.get());
 928
 929   input_method_filter_.reset(new ::wm::InputMethodEventFilter(
 930       root_window->GetHost()->GetAcceleratedWidget()));
 931   AddPreTargetHandler(input_method_filter_.get());
 932
 933   accelerator_filter_.reset(new ::wm::AcceleratorFilter(
 934       scoped_ptr< ::wm::AcceleratorDelegate>(new AcceleratorDelegate).Pass(),
 935       accelerator_controller_->accelerator_history()));
 936   AddPreTargetHandler(accelerator_filter_.get());
 937
 938   event_transformation_handler_.reset(new EventTransformationHandler);
 939   AddPreTargetHandler(event_transformation_handler_.get());
 940
 941   toplevel_window_event_handler_.reset(new ToplevelWindowEventHandler);
 942
 943   system_gesture_filter_.reset(new SystemGestureEventFilter);
 944   AddPreTargetHandler(system_gesture_filter_.get());
 945
 946   keyboard_metrics_filter_.reset(new KeyboardUMAEventFilter);
 947   AddPreTargetHandler(keyboard_metrics_filter_.get());
 948
 949   // The keyboard system must be initialized before the RootWindowController is
 950   // created.
 951 #if defined(OS_CHROMEOS)
 952     keyboard::InitializeKeyboard();
 953 #endif
 954
 955 #if defined(OS_CHROMEOS)
 956   sticky_keys_controller_.reset(new StickyKeysController);
 957 #endif
 958
 959   lock_state_controller_.reset(new LockStateController);
 960   power_button_controller_.reset(new PowerButtonController(
 961       lock_state_controller_.get()));
 962 #if defined(OS_CHROMEOS)
 963   // Pass the initial display state to PowerButtonController.
 964   power_button_controller_->OnDisplayModeChanged(
 965       display_configurator_->cached_displays());
 966 #endif
 967   AddShellObserver(lock_state_controller_.get());
 968
 969   drag_drop_controller_.reset(new DragDropController);
 970   mouse_cursor_filter_.reset(new MouseCursorEventFilter());
 971   PrependPreTargetHandler(mouse_cursor_filter_.get());
 972
 973   // Create Controllers that may need root window.
 974   // TODO(oshima): Move as many controllers before creating
 975   // RootWindowController as possible.
 976   visibility_controller_.reset(new AshVisibilityController);
 977
 978   magnification_controller_.reset(
 979       MagnificationController::CreateInstance());
 980   mru_window_tracker_.reset(new MruWindowTracker(activation_client_,
 981                                                  focus_rules));
 982
 983   partial_magnification_controller_.reset(
 984       new PartialMagnificationController());
 985
 986   autoclick_controller_.reset(AutoclickController::CreateInstance());
 987
 988   high_contrast_controller_.reset(new HighContrastController);
 989   video_detector_.reset(new VideoDetector);
 990   window_selector_controller_.reset(new WindowSelectorController());
 991   window_cycle_controller_.reset(new WindowCycleController());
 992
 993   tooltip_controller_.reset(
 994       new views::corewm::TooltipController(
 995           scoped_ptr<views::corewm::Tooltip>(
 996               new views::corewm::TooltipAura(gfx::SCREEN_TYPE_ALTERNATE))));
 997   AddPreTargetHandler(tooltip_controller_.get());
 998
 999   event_client_.reset(new EventClientImpl);
1000
1001   // This controller needs to be set before SetupManagedWindowMode.
1002   desktop_background_controller_.reset(new DesktopBackgroundController());
1003   user_wallpaper_delegate_.reset(delegate_->CreateUserWallpaperDelegate());
1004
1005   session_state_delegate_.reset(delegate_->CreateSessionStateDelegate());
1006   accessibility_delegate_.reset(delegate_->CreateAccessibilityDelegate());
1007   new_window_delegate_.reset(delegate_->CreateNewWindowDelegate());
1008   media_delegate_.reset(delegate_->CreateMediaDelegate());
1009
1010   resize_shadow_controller_.reset(new ResizeShadowController());
1011   shadow_controller_.reset(
1012       new ::wm::ShadowController(activation_client_));
1013
1014   // Create system_tray_notifier_ before the delegate.
1015   system_tray_notifier_.reset(new ash::SystemTrayNotifier());
1016
1017   // Initialize system_tray_delegate_ before initializing StatusAreaWidget.
1018   system_tray_delegate_.reset(delegate()->CreateSystemTrayDelegate());
1019   DCHECK(system_tray_delegate_.get());
1020
1021   locale_notification_controller_.reset(new LocaleNotificationController);
1022
1023   // Initialize system_tray_delegate_ after StatusAreaWidget is created.
1024   system_tray_delegate_->Initialize();
1025
1026 #if defined(OS_CHROMEOS)
1027   // Create the LogoutConfirmationController after the SystemTrayDelegate.
1028   logout_confirmation_controller_.reset(new LogoutConfirmationController(
1029       base::Bind(&SystemTrayDelegate::SignOut,
1030                  base::Unretained(system_tray_delegate_.get()))));
1031
1032   // Create TouchTransformerController before DisplayController::InitDisplays()
1033   // since TouchTransformerController listens on
1034   // DisplayController::Observer::OnDisplaysInitialized().
1035   touch_transformer_controller_.reset(new TouchTransformerController());
1036 #endif  // defined(OS_CHROMEOS)
1037
1038   display_controller_->InitDisplays();
1039
1040 #if defined(OS_CHROMEOS)
1041   // Needs to be created after InitDisplays() since it may cause the virtual
1042   // keyboard to be deployed.
1043   virtual_keyboard_controller_.reset(new VirtualKeyboardController);
1044 #endif  // defined(OS_CHROMEOS)
1045
1046   // It needs to be created after RootWindowController has been created
1047   // (which calls OnWindowResized has been called, otherwise the
1048   // widget will not paint when restoring after a browser crash.  Also it needs
1049   // to be created after InitSecondaryDisplays() to initialize the wallpapers in
1050   // the correct size.
1051   user_wallpaper_delegate_->InitializeWallpaper();
1052
1053   if (initially_hide_cursor_)
1054     cursor_manager_.HideCursor();
1055   cursor_manager_.SetCursor(ui::kCursorPointer);
1056
1057 #if defined(OS_CHROMEOS)
1058   // Set accelerator controller delegates.
1059   accelerator_controller_->SetBrightnessControlDelegate(
1060       scoped_ptr<ash::BrightnessControlDelegate>(
1061           new ash::system::BrightnessControllerChromeos).Pass());
1062
1063   power_event_observer_.reset(new PowerEventObserver());
1064   user_activity_notifier_.reset(
1065       new ui::UserActivityPowerManagerNotifier(user_activity_detector_.get()));
1066   video_activity_notifier_.reset(
1067       new VideoActivityNotifier(video_detector_.get()));
1068   bluetooth_notification_controller_.reset(new BluetoothNotificationController);
1069   last_window_closed_logout_reminder_.reset(new LastWindowClosedLogoutReminder);
1070   screen_orientation_controller_.reset(new ScreenOrientationController());
1071 #endif
1072   // The compositor thread and main message loop have to be running in
1073   // order to create mirror window. Run it after the main message loop
1074   // is started.
1075   display_manager_->CreateMirrorWindowAsyncIfAny();
1076 }
1077
1078 void Shell::InitKeyboard() {
1079   if (keyboard::IsKeyboardEnabled()) {
1080     if (keyboard::KeyboardController::GetInstance()) {
1081       RootWindowControllerList controllers = GetAllRootWindowControllers();
1082       for (RootWindowControllerList::iterator iter = controllers.begin();
1083            iter != controllers.end(); ++iter) {
1084         (*iter)->DeactivateKeyboard(
1085             keyboard::KeyboardController::GetInstance());
1086       }
1087     }
1088     keyboard::KeyboardControllerProxy* proxy =
1089         delegate_->CreateKeyboardControllerProxy();
1090     keyboard::KeyboardController::ResetInstance(
1091         new keyboard::KeyboardController(proxy));
1092   }
1093 }
1094
1095 void Shell::InitRootWindow(aura::Window* root_window) {
1096   DCHECK(activation_client_);
1097   DCHECK(visibility_controller_.get());
1098   DCHECK(drag_drop_controller_.get());
1099
1100   aura::client::SetFocusClient(root_window, focus_client_.get());
1101   input_method_filter_->SetInputMethodPropertyInRootWindow(root_window);
1102   aura::client::SetActivationClient(root_window, activation_client_);
1103   ::wm::FocusController* focus_controller =
1104       static_cast< ::wm::FocusController*>(activation_client_);
1105   root_window->AddPreTargetHandler(focus_controller);
1106   aura::client::SetVisibilityClient(root_window, visibility_controller_.get());
1107   aura::client::SetDragDropClient(root_window, drag_drop_controller_.get());
1108   aura::client::SetScreenPositionClient(root_window,
1109                                         screen_position_controller_.get());
1110   aura::client::SetCursorClient(root_window, &cursor_manager_);
1111   aura::client::SetTooltipClient(root_window, tooltip_controller_.get());
1112   aura::client::SetEventClient(root_window, event_client_.get());
1113
1114   aura::client::SetWindowMoveClient(root_window,
1115       toplevel_window_event_handler_.get());
1116   root_window->AddPreTargetHandler(toplevel_window_event_handler_.get());
1117   root_window->AddPostTargetHandler(toplevel_window_event_handler_.get());
1118
1119   if (nested_accelerator_controller_) {
1120     aura::client::SetDispatcherClient(root_window,
1121                                       nested_accelerator_controller_.get());
1122   }
1123 }
1124
1125 bool Shell::CanWindowReceiveEvents(aura::Window* window) {
1126   RootWindowControllerList controllers = GetAllRootWindowControllers();
1127   for (RootWindowControllerList::iterator iter = controllers.begin();
1128        iter != controllers.end(); ++iter) {
1129     SystemModalContainerLayoutManager* layout_manager =
1130         (*iter)->GetSystemModalLayoutManager(window);
1131     if (layout_manager && layout_manager->CanWindowReceiveEvents(window))
1132       return true;
1133     // Allow events to fall through to the virtual keyboard even if displaying
1134     // a system modal dialog.
1135     if ((*iter)->IsVirtualKeyboardWindow(window))
1136       return true;
1137   }
1138
1139   return false;
1140 }
1141
1142 ////////////////////////////////////////////////////////////////////////////////
1143 // Shell, ui::EventTarget overrides:
1144
1145 bool Shell::CanAcceptEvent(const ui::Event& event) {
1146   return true;
1147 }
1148
1149 ui::EventTarget* Shell::GetParentTarget() {
1150   return aura::Env::GetInstance();
1151 }
1152
1153 scoped_ptr<ui::EventTargetIterator> Shell::GetChildIterator() const {
1154   return scoped_ptr<ui::EventTargetIterator>();
1155 }
1156
1157 ui::EventTargeter* Shell::GetEventTargeter() {
1158   NOTREACHED();
1159   return NULL;
1160 }
1161
1162 void Shell::OnEvent(ui::Event* event) {
1163 }
1164
1165 ////////////////////////////////////////////////////////////////////////////////
1166 // Shell, aura::client::ActivationChangeObserver implementation:
1167
1168 void Shell::OnWindowActivated(aura::Window* gained_active,
1169                               aura::Window* lost_active) {
1170   if (gained_active)
1171     target_root_window_ = gained_active->GetRootWindow();
1172 }
1173
1174 }  // namespace ash