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/utility/partial_screenshot_controller.h"
  56 #include "ash/wm/app_list_controller.h"
  57 #include "ash/wm/ash_focus_rules.h"
  58 #include "ash/wm/ash_native_cursor_manager.h"
  59 #include "ash/wm/coordinate_conversion.h"
  60 #include "ash/wm/event_client_impl.h"
  61 #include "ash/wm/lock_state_controller.h"
  62 #include "ash/wm/maximize_mode/maximize_mode_controller.h"
  63 #include "ash/wm/maximize_mode/maximize_mode_window_manager.h"
  64 #include "ash/wm/mru_window_tracker.h"
  65 #include "ash/wm/overlay_event_filter.h"
  66 #include "ash/wm/overview/window_selector_controller.h"
  67 #include "ash/wm/power_button_controller.h"
  68 #include "ash/wm/resize_shadow_controller.h"
  69 #include "ash/wm/root_window_layout_manager.h"
  70 #include "ash/wm/screen_dimmer.h"
  71 #include "ash/wm/system_gesture_event_filter.h"
  72 #include "ash/wm/system_modal_container_event_filter.h"
  73 #include "ash/wm/system_modal_container_layout_manager.h"
  74 #include "ash/wm/toplevel_window_event_handler.h"
  75 #include "ash/wm/video_detector.h"
  76 #include "ash/wm/window_animations.h"
  77 #include "ash/wm/window_cycle_controller.h"
  78 #include "ash/wm/window_positioner.h"
  79 #include "ash/wm/window_properties.h"
  80 #include "ash/wm/window_util.h"
  81 #include "ash/wm/workspace_controller.h"
  82 #include "base/bind.h"
  83 #include "base/trace_event/trace_event.h"
  84 #include "ui/aura/client/aura_constants.h"
  85 #include "ui/aura/env.h"
  86 #include "ui/aura/layout_manager.h"
  87 #include "ui/aura/window.h"
  88 #include "ui/aura/window_event_dispatcher.h"
  89 #include "ui/base/ui_base_switches.h"
  90 #include "ui/base/user_activity/user_activity_detector.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/geometry/size.h"
  96 #include "ui/gfx/image/image_skia.h"
  97 #include "ui/gfx/screen.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/visibility_controller.h"
 115 #include "ui/wm/core/window_modality_controller.h"
 116
 117 #if defined(OS_CHROMEOS)
 118 #if defined(USE_X11)
 119 #include "ui/gfx/x/x11_types.h"
 120 #endif  // defined(USE_X11)
 121 #include "ash/accelerators/magnifier_key_scroller.h"
 122 #include "ash/accelerators/spoken_feedback_toggler.h"
 123 #include "ash/ash_constants.h"
 124 #include "ash/content/display/screen_orientation_controller_chromeos.h"
 125 #include "ash/display/display_change_observer_chromeos.h"
 126 #include "ash/display/display_configurator_animation.h"
 127 #include "ash/display/display_error_observer_chromeos.h"
 128 #include "ash/display/projecting_observer_chromeos.h"
 129 #include "ash/display/resolution_notification_controller.h"
 130 #include "ash/sticky_keys/sticky_keys_controller.h"
 131 #include "ash/system/chromeos/bluetooth/bluetooth_notification_controller.h"
 132 #include "ash/system/chromeos/brightness/brightness_controller_chromeos.h"
 133 #include "ash/system/chromeos/power/power_event_observer.h"
 134 #include "ash/system/chromeos/power/power_status.h"
 135 #include "ash/system/chromeos/power/video_activity_notifier.h"
 136 #include "ash/system/chromeos/session/last_window_closed_logout_reminder.h"
 137 #include "ash/system/chromeos/session/logout_confirmation_controller.h"
 138 #include "ash/touch/touch_transformer_controller.h"
 139 #include "ash/virtual_keyboard_controller.h"
 140 #include "base/bind_helpers.h"
 141 #include "base/sys_info.h"
 142 #include "chromeos/dbus/dbus_thread_manager.h"
 143 #include "ui/chromeos/user_activity_power_manager_notifier.h"
 144 #include "ui/display/chromeos/display_configurator.h"
 145 #endif  // defined(OS_CHROMEOS)
 146
 147 namespace ash {
 148
 149 namespace {
 150
 151 using aura::Window;
 152 using views::Widget;
 153
 154 // A Corewm VisibilityController subclass that calls the Ash animation routine
 155 // so we can pick up our extended animations. See ash/wm/window_animations.h.
 156 class AshVisibilityController : public ::wm::VisibilityController {
 157  public:
 158   AshVisibilityController() {}
 159   ~AshVisibilityController() override {}
 160
 161  private:
 162   // Overridden from ::wm::VisibilityController:
 163   bool CallAnimateOnChildWindowVisibilityChanged(aura::Window* window,
 164                                                  bool visible) override {
 165     return AnimateOnChildWindowVisibilityChanged(window, visible);
 166   }
 167
 168   DISALLOW_COPY_AND_ASSIGN(AshVisibilityController);
 169 };
 170
 171 AshWindowTreeHostInitParams ShellInitParamsToAshWindowTreeHostInitParams(
 172     const ShellInitParams& shell_init_params) {
 173   AshWindowTreeHostInitParams ash_init_params;
 174 #if defined(OS_WIN)
 175   ash_init_params.remote_hwnd = shell_init_params.remote_hwnd;
 176 #endif
 177   return ash_init_params;
 178 }
 179
 180 }  // namespace
 181
 182 // static
 183 Shell* Shell::instance_ = NULL;
 184 // static
 185 bool Shell::initially_hide_cursor_ = false;
 186
 187 ////////////////////////////////////////////////////////////////////////////////
 188 // Shell, public:
 189
 190 // static
 191 Shell* Shell::CreateInstance(const ShellInitParams& init_params) {
 192   CHECK(!instance_);
 193   instance_ = new Shell(init_params.delegate);
 194   instance_->Init(init_params);
 195   return instance_;
 196 }
 197
 198 // static
 199 Shell* Shell::GetInstance() {
 200   CHECK(instance_);
 201   return instance_;
 202 }
 203
 204 // static
 205 bool Shell::HasInstance() {
 206   return !!instance_;
 207 }
 208
 209 // static
 210 void Shell::DeleteInstance() {
 211   delete instance_;
 212   instance_ = NULL;
 213 }
 214
 215 // static
 216 RootWindowController* Shell::GetPrimaryRootWindowController() {
 217   CHECK(HasInstance());
 218   return GetRootWindowController(GetPrimaryRootWindow());
 219 }
 220
 221 // static
 222 Shell::RootWindowControllerList Shell::GetAllRootWindowControllers() {
 223   CHECK(HasInstance());
 224   return Shell::GetInstance()->display_controller()->
 225       GetAllRootWindowControllers();
 226 }
 227
 228 // static
 229 aura::Window* Shell::GetPrimaryRootWindow() {
 230   CHECK(HasInstance());
 231   return GetInstance()->display_controller()->GetPrimaryRootWindow();
 232 }
 233
 234 // static
 235 aura::Window* Shell::GetTargetRootWindow() {
 236   CHECK(HasInstance());
 237   Shell* shell = GetInstance();
 238   if (shell->scoped_target_root_window_)
 239     return shell->scoped_target_root_window_;
 240   return shell->target_root_window_;
 241 }
 242
 243 // static
 244 gfx::Screen* Shell::GetScreen() {
 245   return gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_ALTERNATE);
 246 }
 247
 248 // static
 249 aura::Window::Windows Shell::GetAllRootWindows() {
 250   CHECK(HasInstance());
 251   return Shell::GetInstance()->display_controller()->
 252       GetAllRootWindows();
 253 }
 254
 255 // static
 256 aura::Window* Shell::GetContainer(aura::Window* root_window,
 257                                   int container_id) {
 258   return root_window->GetChildById(container_id);
 259 }
 260
 261 // static
 262 const aura::Window* Shell::GetContainer(const aura::Window* root_window,
 263                                         int container_id) {
 264   return root_window->GetChildById(container_id);
 265 }
 266
 267 // static
 268 std::vector<aura::Window*> Shell::GetContainersFromAllRootWindows(
 269     int container_id,
 270     aura::Window* priority_root) {
 271   std::vector<aura::Window*> containers;
 272   aura::Window::Windows root_windows = GetAllRootWindows();
 273   for (aura::Window::Windows::const_iterator it = root_windows.begin();
 274        it != root_windows.end(); ++it) {
 275     aura::Window* container = (*it)->GetChildById(container_id);
 276     if (container) {
 277       if (priority_root && priority_root->Contains(container))
 278         containers.insert(containers.begin(), container);
 279       else
 280         containers.push_back(container);
 281     }
 282   }
 283   return containers;
 284 }
 285
 286 void Shell::ShowContextMenu(const gfx::Point& location_in_screen,
 287                             ui::MenuSourceType source_type) {
 288   // No context menus if there is no session with an active user.
 289   if (!session_state_delegate_->NumberOfLoggedInUsers())
 290     return;
 291   // No context menus when screen is locked.
 292   if (session_state_delegate_->IsScreenLocked())
 293     return;
 294
 295   aura::Window* root =
 296       wm::GetRootWindowMatching(gfx::Rect(location_in_screen, gfx::Size()));
 297   GetRootWindowController(root)
 298       ->ShowContextMenu(location_in_screen, source_type);
 299 }
 300
 301 void Shell::ShowAppList(aura::Window* window) {
 302   // If the context window is not given, show it on the target root window.
 303   if (!window)
 304     window = GetTargetRootWindow();
 305   if (!app_list_controller_)
 306     app_list_controller_.reset(new AppListController);
 307   app_list_controller_->Show(window);
 308 }
 309
 310 void Shell::DismissAppList() {
 311   if (!app_list_controller_)
 312     return;
 313   app_list_controller_->Dismiss();
 314 }
 315
 316 void Shell::ToggleAppList(aura::Window* window) {
 317   if (app_list_controller_ && app_list_controller_->IsVisible()) {
 318     DismissAppList();
 319     return;
 320   }
 321
 322   ShowAppList(window);
 323 }
 324
 325 bool Shell::GetAppListTargetVisibility() const {
 326   return app_list_controller_.get() &&
 327       app_list_controller_->GetTargetVisibility();
 328 }
 329
 330 aura::Window* Shell::GetAppListWindow() {
 331   return app_list_controller_.get() ? app_list_controller_->GetWindow() : NULL;
 332 }
 333
 334 app_list::AppListView* Shell::GetAppListView() {
 335   return app_list_controller_.get() ? app_list_controller_->GetView() : NULL;
 336 }
 337
 338 bool Shell::IsSystemModalWindowOpen() const {
 339   if (simulate_modal_window_open_for_testing_)
 340     return true;
 341   const std::vector<aura::Window*> containers = GetContainersFromAllRootWindows(
 342       kShellWindowId_SystemModalContainer, NULL);
 343   for (std::vector<aura::Window*>::const_iterator cit = containers.begin();
 344        cit != containers.end(); ++cit) {
 345     for (aura::Window::Windows::const_iterator wit = (*cit)->children().begin();
 346          wit != (*cit)->children().end(); ++wit) {
 347       if ((*wit)->GetProperty(aura::client::kModalKey) ==
 348           ui::MODAL_TYPE_SYSTEM && (*wit)->TargetVisibility()) {
 349         return true;
 350       }
 351     }
 352   }
 353   return false;
 354 }
 355
 356 views::NonClientFrameView* Shell::CreateDefaultNonClientFrameView(
 357     views::Widget* widget) {
 358   // Use translucent-style window frames for dialogs.
 359   return new CustomFrameViewAsh(widget);
 360 }
 361
 362 void Shell::RotateFocus(Direction direction) {
 363   focus_cycler_->RotateFocus(direction == FORWARD ? FocusCycler::FORWARD
 364                                                   : FocusCycler::BACKWARD);
 365 }
 366
 367 void Shell::SetDisplayWorkAreaInsets(Window* contains,
 368                                      const gfx::Insets& insets) {
 369   if (!display_controller_->UpdateWorkAreaOfDisplayNearestWindow(
 370           contains, insets)) {
 371     return;
 372   }
 373   FOR_EACH_OBSERVER(ShellObserver, observers_,
 374                     OnDisplayWorkAreaInsetsChanged());
 375 }
 376
 377 void Shell::OnLoginStateChanged(user::LoginStatus status) {
 378   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLoginStateChanged(status));
 379 }
 380
 381 void Shell::OnLoginUserProfilePrepared() {
 382   CreateShelf();
 383   CreateKeyboard();
 384 }
 385
 386 void Shell::UpdateAfterLoginStatusChange(user::LoginStatus status) {
 387   RootWindowControllerList controllers = GetAllRootWindowControllers();
 388   for (RootWindowControllerList::iterator iter = controllers.begin();
 389        iter != controllers.end(); ++iter)
 390     (*iter)->UpdateAfterLoginStatusChange(status);
 391 }
 392
 393 void Shell::OnAppTerminating() {
 394   FOR_EACH_OBSERVER(ShellObserver, observers_, OnAppTerminating());
 395 }
 396
 397 void Shell::OnLockStateChanged(bool locked) {
 398   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLockStateChanged(locked));
 399 #ifndef NDEBUG
 400   // Make sure that there is no system modal in Lock layer when unlocked.
 401   if (!locked) {
 402     std::vector<aura::Window*> containers = GetContainersFromAllRootWindows(
 403         kShellWindowId_LockSystemModalContainer, GetPrimaryRootWindow());
 404     for (std::vector<aura::Window*>::const_iterator iter = containers.begin();
 405          iter != containers.end(); ++iter) {
 406       DCHECK_EQ(0u, (*iter)->children().size());
 407     }
 408   }
 409 #endif
 410 }
 411
 412 void Shell::OnCastingSessionStartedOrStopped(bool started) {
 413 #if defined(OS_CHROMEOS)
 414   if (projecting_observer_)
 415     projecting_observer_->OnCastingSessionStartedOrStopped(started);
 416 #endif
 417 }
 418
 419 void Shell::OnOverviewModeStarting() {
 420   FOR_EACH_OBSERVER(ShellObserver, observers_, OnOverviewModeStarting());
 421 }
 422
 423 void Shell::OnOverviewModeEnded() {
 424   FOR_EACH_OBSERVER(ShellObserver, observers_, OnOverviewModeEnded());
 425 }
 426
 427 void Shell::OnMaximizeModeStarted() {
 428   FOR_EACH_OBSERVER(ShellObserver, observers_, OnMaximizeModeStarted());
 429 }
 430
 431 void Shell::OnMaximizeModeEnded() {
 432   FOR_EACH_OBSERVER(ShellObserver, observers_, OnMaximizeModeEnded());
 433 }
 434
 435 void Shell::OnRootWindowAdded(aura::Window* root_window) {
 436   FOR_EACH_OBSERVER(ShellObserver, observers_, OnRootWindowAdded(root_window));
 437 }
 438
 439 void Shell::CreateShelf() {
 440   RootWindowControllerList controllers = GetAllRootWindowControllers();
 441   for (RootWindowControllerList::iterator iter = controllers.begin();
 442        iter != controllers.end(); ++iter)
 443     (*iter)->shelf()->CreateShelf();
 444 }
 445
 446 void Shell::OnShelfCreatedForRootWindow(aura::Window* root_window) {
 447   FOR_EACH_OBSERVER(ShellObserver,
 448                     observers_,
 449                     OnShelfCreatedForRootWindow(root_window));
 450 }
 451
 452 void Shell::CreateKeyboard() {
 453   // TODO(bshe): Primary root window controller may not be the controller to
 454   // attach virtual keyboard. See http://crbug.com/303429
 455   InitKeyboard();
 456   GetPrimaryRootWindowController()->
 457       ActivateKeyboard(keyboard::KeyboardController::GetInstance());
 458 }
 459
 460 void Shell::DeactivateKeyboard() {
 461   if (keyboard::KeyboardController::GetInstance()) {
 462     RootWindowControllerList controllers = GetAllRootWindowControllers();
 463     for (RootWindowControllerList::iterator iter = controllers.begin();
 464         iter != controllers.end(); ++iter) {
 465       (*iter)->DeactivateKeyboard(keyboard::KeyboardController::GetInstance());
 466     }
 467   }
 468   keyboard::KeyboardController::ResetInstance(NULL);
 469 }
 470
 471 void Shell::ShowShelf() {
 472   RootWindowControllerList controllers = GetAllRootWindowControllers();
 473   for (RootWindowControllerList::iterator iter = controllers.begin();
 474        iter != controllers.end(); ++iter)
 475     (*iter)->ShowShelf();
 476 }
 477
 478 void Shell::AddShellObserver(ShellObserver* observer) {
 479   observers_.AddObserver(observer);
 480 }
 481
 482 void Shell::RemoveShellObserver(ShellObserver* observer) {
 483   observers_.RemoveObserver(observer);
 484 }
 485
 486 #if defined(OS_CHROMEOS)
 487 bool Shell::ShouldSaveDisplaySettings() {
 488   return !(screen_orientation_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 #if defined(OS_CHROMEOS)
 641       display_configurator_(new ui::DisplayConfigurator()),
 642 #endif  // defined(OS_CHROMEOS)
 643       native_cursor_manager_(new AshNativeCursorManager),
 644       cursor_manager_(
 645           scoped_ptr<::wm::NativeCursorManager>(native_cursor_manager_)),
 646       simulate_modal_window_open_for_testing_(false),
 647       is_touch_hud_projection_enabled_(false) {
 648   DCHECK(delegate_.get());
 649   gpu_support_.reset(delegate_->CreateGPUSupport());
 650   display_manager_.reset(new DisplayManager);
 651   display_controller_.reset(new DisplayController);
 652   user_metrics_recorder_.reset(new UserMetricsRecorder);
 653
 654 #if defined(OS_CHROMEOS)
 655   PowerStatus::Initialize();
 656 #endif
 657 }
 658
 659 Shell::~Shell() {
 660   TRACE_EVENT0("shutdown", "ash::Shell::Destructor");
 661
 662   delegate_->PreShutdown();
 663
 664   views::FocusManagerFactory::Install(NULL);
 665
 666   // Remove the focus from any window. This will prevent overhead and side
 667   // effects (e.g. crashes) from changing focus during shutdown.
 668   // See bug crbug.com/134502.
 669   aura::client::GetFocusClient(GetPrimaryRootWindow())->FocusWindow(NULL);
 670
 671   // Please keep in same order as in Init() because it's easy to miss one.
 672   if (window_modality_controller_)
 673     window_modality_controller_.reset();
 674 #if defined(OS_CHROMEOS)
 675   RemovePreTargetHandler(magnifier_key_scroll_handler_.get());
 676   magnifier_key_scroll_handler_.reset();
 677
 678   RemovePreTargetHandler(speech_feedback_handler_.get());
 679   speech_feedback_handler_.reset();
 680 #endif
 681   RemovePreTargetHandler(user_activity_detector_.get());
 682   RemovePreTargetHandler(overlay_filter_.get());
 683   RemovePreTargetHandler(input_method_filter_.get());
 684   RemovePreTargetHandler(accelerator_filter_.get());
 685   RemovePreTargetHandler(event_transformation_handler_.get());
 686   RemovePreTargetHandler(toplevel_window_event_handler_.get());
 687   RemovePostTargetHandler(toplevel_window_event_handler_.get());
 688   RemovePreTargetHandler(system_gesture_filter_.get());
 689   RemovePreTargetHandler(keyboard_metrics_filter_.get());
 690   RemovePreTargetHandler(mouse_cursor_filter_.get());
 691
 692   // TooltipController is deleted with the Shell so removing its references.
 693   RemovePreTargetHandler(tooltip_controller_.get());
 694
 695 #if defined(OS_CHROMEOS)
 696   screen_orientation_controller_.reset();
 697 #endif
 698
 699 // Destroy the virtual keyboard controller before the maximize mode controller
 700 // since the latters destructor triggers events that the former is listening
 701 // to but no longer cares about.
 702 #if defined(OS_CHROMEOS)
 703   virtual_keyboard_controller_.reset();
 704 #endif
 705
 706   // Destroy maximize mode controller early on since it has some observers which
 707   // need to be removed.
 708   maximize_mode_controller_.reset();
 709
 710   // AppList needs to be released before shelf layout manager, which is
 711   // destroyed with shelf container in the loop below. However, app list
 712   // container is now on top of shelf container and released after it.
 713   // TODO(xiyuan): Move it back when app list container is no longer needed.
 714   app_list_controller_.reset();
 715
 716 #if defined(OS_CHROMEOS)
 717   // Destroy the LastWindowClosedLogoutReminder before the
 718   // LogoutConfirmationController.
 719   last_window_closed_logout_reminder_.reset();
 720
 721   // Destroy the LogoutConfirmationController before the SystemTrayDelegate.
 722   logout_confirmation_controller_.reset();
 723 #endif
 724
 725   // Destroy SystemTrayDelegate before destroying the status area(s).
 726   system_tray_delegate_->Shutdown();
 727   system_tray_delegate_.reset();
 728
 729   locale_notification_controller_.reset();
 730
 731   // Drag-and-drop must be canceled prior to close all windows.
 732   drag_drop_controller_.reset();
 733
 734   // Controllers who have WindowObserver added must be deleted
 735   // before |display_controller_| is deleted.
 736
 737 #if defined(OS_CHROMEOS)
 738   // VideoActivityNotifier must be deleted before |video_detector_| is
 739   // deleted because it's observing video activity through
 740   // VideoDetectorObserver interface.
 741   video_activity_notifier_.reset();
 742 #endif  // defined(OS_CHROMEOS)
 743   video_detector_.reset();
 744   high_contrast_controller_.reset();
 745
 746   shadow_controller_.reset();
 747   resize_shadow_controller_.reset();
 748
 749   window_cycle_controller_.reset();
 750   window_selector_controller_.reset();
 751   mru_window_tracker_.reset();
 752
 753   // |shelf_window_watcher_| has a weak pointer to |shelf_Model_|
 754   // and has window observers.
 755   shelf_window_watcher_.reset();
 756
 757   // Destroy all child windows including widgets.
 758   display_controller_->CloseChildWindows();
 759   display_controller_->CloseMirroringDisplay();
 760
 761   // Chrome implementation of shelf delegate depends on FocusClient,
 762   // so must be deleted before |focus_client_|.
 763   shelf_delegate_.reset();
 764   focus_client_.reset();
 765
 766   // Destroy SystemTrayNotifier after destroying SystemTray as TrayItems
 767   // needs to remove observers from it.
 768   system_tray_notifier_.reset();
 769
 770   // These need a valid Shell instance to clean up properly, so explicitly
 771   // delete them before invalidating the instance.
 772   // Alphabetical. TODO(oshima): sort.
 773   magnification_controller_.reset();
 774   partial_magnification_controller_.reset();
 775   tooltip_controller_.reset();
 776   event_client_.reset();
 777   nested_accelerator_controller_.reset();
 778   toplevel_window_event_handler_.reset();
 779   visibility_controller_.reset();
 780   // |shelf_item_delegate_manager_| observes |shelf_model_|. It must be
 781   // destroyed before |shelf_model_| is destroyed.
 782   shelf_item_delegate_manager_.reset();
 783   shelf_model_.reset();
 784
 785   power_button_controller_.reset();
 786   lock_state_controller_.reset();
 787
 788 #if defined(OS_CHROMEOS)
 789   resolution_notification_controller_.reset();
 790 #endif
 791   desktop_background_controller_.reset();
 792   partial_screenshot_controller_.reset();
 793   mouse_cursor_filter_.reset();
 794
 795 #if defined(OS_CHROMEOS)
 796   touch_transformer_controller_.reset();
 797 #endif  // defined(OS_CHROMEOS)
 798
 799   // This also deletes all RootWindows. Note that we invoke Shutdown() on
 800   // DisplayController before resetting |display_controller_|, since destruction
 801   // of its owned RootWindowControllers relies on the value.
 802   display_manager_->CreateScreenForShutdown();
 803   display_controller_->Shutdown();
 804   display_controller_.reset();
 805   screen_position_controller_.reset();
 806   accessibility_delegate_.reset();
 807   new_window_delegate_.reset();
 808   media_delegate_.reset();
 809
 810   keyboard::KeyboardController::ResetInstance(NULL);
 811
 812 #if defined(OS_CHROMEOS)
 813   if (display_change_observer_)
 814     display_configurator_->RemoveObserver(display_change_observer_.get());
 815   if (display_configurator_animation_)
 816     display_configurator_->RemoveObserver(
 817         display_configurator_animation_.get());
 818   if (display_error_observer_)
 819     display_configurator_->RemoveObserver(display_error_observer_.get());
 820   if (projecting_observer_)
 821     display_configurator_->RemoveObserver(projecting_observer_.get());
 822   display_change_observer_.reset();
 823
 824   PowerStatus::Shutdown();
 825
 826   // Ensure that DBusThreadManager outlives this Shell.
 827   DCHECK(chromeos::DBusThreadManager::IsInitialized());
 828 #endif
 829
 830   DCHECK(instance_ == this);
 831   instance_ = NULL;
 832 }
 833
 834 void Shell::Init(const ShellInitParams& init_params) {
 835   delegate_->PreInit();
 836   bool display_initialized = display_manager_->InitFromCommandLine();
 837 #if defined(OS_CHROMEOS)
 838   display_configurator_->Init(!gpu_support_->IsPanelFittingDisabled());
 839   display_configurator_animation_.reset(new DisplayConfiguratorAnimation());
 840   display_configurator_->AddObserver(display_configurator_animation_.get());
 841
 842   // The DBusThreadManager must outlive this Shell. See the DCHECK in ~Shell.
 843   chromeos::DBusThreadManager* dbus_thread_manager =
 844       chromeos::DBusThreadManager::Get();
 845   projecting_observer_.reset(
 846       new ProjectingObserver(dbus_thread_manager->GetPowerManagerClient()));
 847   display_configurator_->AddObserver(projecting_observer_.get());
 848
 849   if (!display_initialized && base::SysInfo::IsRunningOnChromeOS()) {
 850     display_change_observer_.reset(new DisplayChangeObserver);
 851     // Register |display_change_observer_| first so that the rest of
 852     // observer gets invoked after the root windows are configured.
 853     display_configurator_->AddObserver(display_change_observer_.get());
 854     display_error_observer_.reset(new DisplayErrorObserver());
 855     display_configurator_->AddObserver(display_error_observer_.get());
 856     display_configurator_->set_state_controller(display_change_observer_.get());
 857     display_configurator_->set_mirroring_controller(display_manager_.get());
 858     display_configurator_->ForceInitialConfigure(
 859         delegate_->IsFirstRunAfterBoot() ? kChromeOsBootColor : 0);
 860     display_initialized = true;
 861   }
 862 #endif  // defined(OS_CHROMEOS)
 863   if (!display_initialized)
 864     display_manager_->InitDefaultDisplay();
 865
 866   display_manager_->RefreshFontParams();
 867
 868   // Install the custom factory first so that views::FocusManagers for Tray,
 869   // Shelf, and WallPaper could be created by the factory.
 870   views::FocusManagerFactory::Install(new AshFocusManagerFactory);
 871
 872   aura::Env::CreateInstance(true);
 873   aura::Env::GetInstance()->set_context_factory(init_params.context_factory);
 874
 875   // The WindowModalityController needs to be at the front of the input event
 876   // pretarget handler list to ensure that it processes input events when modal
 877   // windows are active.
 878   window_modality_controller_.reset(
 879       new ::wm::WindowModalityController(this));
 880
 881   env_filter_.reset(new ::wm::CompoundEventFilter);
 882   AddPreTargetHandler(env_filter_.get());
 883
 884   wm::AshFocusRules* focus_rules = new wm::AshFocusRules();
 885
 886   ::wm::FocusController* focus_controller =
 887       new ::wm::FocusController(focus_rules);
 888   focus_client_.reset(focus_controller);
 889   activation_client_ = focus_controller;
 890   activation_client_->AddObserver(this);
 891   focus_cycler_.reset(new FocusCycler());
 892
 893   screen_position_controller_.reset(new ScreenPositionController);
 894
 895   display_controller_->Start();
 896   display_controller_->CreatePrimaryHost(
 897       ShellInitParamsToAshWindowTreeHostInitParams(init_params));
 898   aura::Window* root_window = display_controller_->GetPrimaryRootWindow();
 899   target_root_window_ = root_window;
 900
 901 #if defined(OS_CHROMEOS)
 902   resolution_notification_controller_.reset(
 903       new ResolutionNotificationController);
 904 #endif
 905
 906   cursor_manager_.SetDisplay(GetScreen()->GetPrimaryDisplay());
 907
 908   nested_accelerator_controller_.reset(
 909       new ::wm::NestedAcceleratorController(new NestedAcceleratorDelegate));
 910   accelerator_controller_.reset(new AcceleratorController);
 911   maximize_mode_controller_.reset(new MaximizeModeController());
 912
 913 #if defined(OS_CHROMEOS)
 914   magnifier_key_scroll_handler_ = MagnifierKeyScroller::CreateHandler();
 915   AddPreTargetHandler(magnifier_key_scroll_handler_.get());
 916   speech_feedback_handler_ = SpokenFeedbackToggler::CreateHandler();
 917   AddPreTargetHandler(speech_feedback_handler_.get());
 918 #endif
 919
 920   // The order in which event filters are added is significant.
 921
 922   // ui::UserActivityDetector passes events to observers, so let them get
 923   // rewritten first.
 924   user_activity_detector_.reset(new ui::UserActivityDetector);
 925   AddPreTargetHandler(user_activity_detector_.get());
 926
 927   overlay_filter_.reset(new OverlayEventFilter);
 928   AddPreTargetHandler(overlay_filter_.get());
 929   AddShellObserver(overlay_filter_.get());
 930
 931   input_method_filter_.reset(new ::wm::InputMethodEventFilter(
 932       root_window->GetHost()->GetAcceleratedWidget()));
 933   AddPreTargetHandler(input_method_filter_.get());
 934
 935   accelerator_filter_.reset(new ::wm::AcceleratorFilter(
 936       scoped_ptr< ::wm::AcceleratorDelegate>(new AcceleratorDelegate).Pass(),
 937       accelerator_controller_->accelerator_history()));
 938   AddPreTargetHandler(accelerator_filter_.get());
 939
 940   event_transformation_handler_.reset(new EventTransformationHandler);
 941   AddPreTargetHandler(event_transformation_handler_.get());
 942
 943   toplevel_window_event_handler_.reset(new ToplevelWindowEventHandler);
 944
 945   system_gesture_filter_.reset(new SystemGestureEventFilter);
 946   AddPreTargetHandler(system_gesture_filter_.get());
 947
 948   keyboard_metrics_filter_.reset(new KeyboardUMAEventFilter);
 949   AddPreTargetHandler(keyboard_metrics_filter_.get());
 950
 951   // The keyboard system must be initialized before the RootWindowController is
 952   // created.
 953 #if defined(OS_CHROMEOS)
 954     keyboard::InitializeKeyboard();
 955 #endif
 956
 957 #if defined(OS_CHROMEOS)
 958   sticky_keys_controller_.reset(new StickyKeysController);
 959 #endif
 960
 961   lock_state_controller_.reset(new LockStateController);
 962   power_button_controller_.reset(new PowerButtonController(
 963       lock_state_controller_.get()));
 964 #if defined(OS_CHROMEOS)
 965   // Pass the initial display state to PowerButtonController.
 966   power_button_controller_->OnDisplayModeChanged(
 967       display_configurator_->cached_displays());
 968 #endif
 969   AddShellObserver(lock_state_controller_.get());
 970
 971   drag_drop_controller_.reset(new DragDropController);
 972   // |partial_screenshot_controller_| needs to be created (and prepended as a
 973   // pre-target handler) at this point, because |mouse_cursor_filter_| needs to
 974   // process mouse events prior to partial screenshot session.
 975   // See http://crbug.com/459214
 976   partial_screenshot_controller_.reset(new PartialScreenshotController());
 977   mouse_cursor_filter_.reset(new MouseCursorEventFilter());
 978   PrependPreTargetHandler(mouse_cursor_filter_.get());
 979
 980   // Create Controllers that may need root window.
 981   // TODO(oshima): Move as many controllers before creating
 982   // RootWindowController as possible.
 983   visibility_controller_.reset(new AshVisibilityController);
 984
 985   magnification_controller_.reset(
 986       MagnificationController::CreateInstance());
 987   mru_window_tracker_.reset(new MruWindowTracker(activation_client_,
 988                                                  focus_rules));
 989
 990   partial_magnification_controller_.reset(
 991       new PartialMagnificationController());
 992
 993   autoclick_controller_.reset(AutoclickController::CreateInstance());
 994
 995   high_contrast_controller_.reset(new HighContrastController);
 996   video_detector_.reset(new VideoDetector);
 997   window_selector_controller_.reset(new WindowSelectorController());
 998   window_cycle_controller_.reset(new WindowCycleController());
 999
1000   tooltip_controller_.reset(new views::corewm::TooltipController(
1001       scoped_ptr<views::corewm::Tooltip>(new views::corewm::TooltipAura)));
1002   AddPreTargetHandler(tooltip_controller_.get());
1003
1004   event_client_.reset(new EventClientImpl);
1005
1006   // This controller needs to be set before SetupManagedWindowMode.
1007   desktop_background_controller_.reset(new DesktopBackgroundController());
1008   user_wallpaper_delegate_.reset(delegate_->CreateUserWallpaperDelegate());
1009
1010   session_state_delegate_.reset(delegate_->CreateSessionStateDelegate());
1011   accessibility_delegate_.reset(delegate_->CreateAccessibilityDelegate());
1012   new_window_delegate_.reset(delegate_->CreateNewWindowDelegate());
1013   media_delegate_.reset(delegate_->CreateMediaDelegate());
1014
1015   resize_shadow_controller_.reset(new ResizeShadowController());
1016   shadow_controller_.reset(
1017       new ::wm::ShadowController(activation_client_));
1018
1019   // Create system_tray_notifier_ before the delegate.
1020   system_tray_notifier_.reset(new ash::SystemTrayNotifier());
1021
1022   // Initialize system_tray_delegate_ before initializing StatusAreaWidget.
1023   system_tray_delegate_.reset(delegate()->CreateSystemTrayDelegate());
1024   DCHECK(system_tray_delegate_.get());
1025
1026   locale_notification_controller_.reset(new LocaleNotificationController);
1027
1028   // Initialize system_tray_delegate_ after StatusAreaWidget is created.
1029   system_tray_delegate_->Initialize();
1030
1031 #if defined(OS_CHROMEOS)
1032   // Create the LogoutConfirmationController after the SystemTrayDelegate.
1033   logout_confirmation_controller_.reset(new LogoutConfirmationController(
1034       base::Bind(&SystemTrayDelegate::SignOut,
1035                  base::Unretained(system_tray_delegate_.get()))));
1036
1037   // Create TouchTransformerController before DisplayController::InitDisplays()
1038   // since TouchTransformerController listens on
1039   // DisplayController::Observer::OnDisplaysInitialized().
1040   touch_transformer_controller_.reset(new TouchTransformerController());
1041 #endif  // defined(OS_CHROMEOS)
1042
1043   display_controller_->InitDisplays();
1044
1045 #if defined(OS_CHROMEOS)
1046   // Needs to be created after InitDisplays() since it may cause the virtual
1047   // keyboard to be deployed.
1048   virtual_keyboard_controller_.reset(new VirtualKeyboardController);
1049 #endif  // defined(OS_CHROMEOS)
1050
1051   // It needs to be created after RootWindowController has been created
1052   // (which calls OnWindowResized has been called, otherwise the
1053   // widget will not paint when restoring after a browser crash.  Also it needs
1054   // to be created after InitSecondaryDisplays() to initialize the wallpapers in
1055   // the correct size.
1056   user_wallpaper_delegate_->InitializeWallpaper();
1057
1058   if (initially_hide_cursor_)
1059     cursor_manager_.HideCursor();
1060   cursor_manager_.SetCursor(ui::kCursorPointer);
1061
1062 #if defined(OS_CHROMEOS)
1063   // Set accelerator controller delegates.
1064   accelerator_controller_->SetBrightnessControlDelegate(
1065       scoped_ptr<ash::BrightnessControlDelegate>(
1066           new ash::system::BrightnessControllerChromeos).Pass());
1067
1068   power_event_observer_.reset(new PowerEventObserver());
1069   user_activity_notifier_.reset(
1070       new ui::UserActivityPowerManagerNotifier(user_activity_detector_.get()));
1071   video_activity_notifier_.reset(
1072       new VideoActivityNotifier(video_detector_.get()));
1073   bluetooth_notification_controller_.reset(new BluetoothNotificationController);
1074   last_window_closed_logout_reminder_.reset(new LastWindowClosedLogoutReminder);
1075   screen_orientation_controller_.reset(new ScreenOrientationController());
1076 #endif
1077   // The compositor thread and main message loop have to be running in
1078   // order to create mirror window. Run it after the main message loop
1079   // is started.
1080   display_manager_->CreateMirrorWindowAsyncIfAny();
1081 }
1082
1083 void Shell::InitKeyboard() {
1084   if (keyboard::IsKeyboardEnabled()) {
1085     if (keyboard::KeyboardController::GetInstance()) {
1086       RootWindowControllerList controllers = GetAllRootWindowControllers();
1087       for (RootWindowControllerList::iterator iter = controllers.begin();
1088            iter != controllers.end(); ++iter) {
1089         (*iter)->DeactivateKeyboard(
1090             keyboard::KeyboardController::GetInstance());
1091       }
1092     }
1093     keyboard::KeyboardControllerProxy* proxy =
1094         delegate_->CreateKeyboardControllerProxy();
1095     keyboard::KeyboardController::ResetInstance(
1096         new keyboard::KeyboardController(proxy));
1097   }
1098 }
1099
1100 void Shell::InitRootWindow(aura::Window* root_window) {
1101   DCHECK(activation_client_);
1102   DCHECK(visibility_controller_.get());
1103   DCHECK(drag_drop_controller_.get());
1104
1105   aura::client::SetFocusClient(root_window, focus_client_.get());
1106   input_method_filter_->SetInputMethodPropertyInRootWindow(root_window);
1107   aura::client::SetActivationClient(root_window, activation_client_);
1108   ::wm::FocusController* focus_controller =
1109       static_cast< ::wm::FocusController*>(activation_client_);
1110   root_window->AddPreTargetHandler(focus_controller);
1111   aura::client::SetVisibilityClient(root_window, visibility_controller_.get());
1112   aura::client::SetDragDropClient(root_window, drag_drop_controller_.get());
1113   aura::client::SetScreenPositionClient(root_window,
1114                                         screen_position_controller_.get());
1115   aura::client::SetCursorClient(root_window, &cursor_manager_);
1116   aura::client::SetTooltipClient(root_window, tooltip_controller_.get());
1117   aura::client::SetEventClient(root_window, event_client_.get());
1118
1119   aura::client::SetWindowMoveClient(root_window,
1120       toplevel_window_event_handler_.get());
1121   root_window->AddPreTargetHandler(toplevel_window_event_handler_.get());
1122   root_window->AddPostTargetHandler(toplevel_window_event_handler_.get());
1123
1124   if (nested_accelerator_controller_) {
1125     aura::client::SetDispatcherClient(root_window,
1126                                       nested_accelerator_controller_.get());
1127   }
1128 }
1129
1130 bool Shell::CanWindowReceiveEvents(aura::Window* window) {
1131   RootWindowControllerList controllers = GetAllRootWindowControllers();
1132   for (RootWindowControllerList::iterator iter = controllers.begin();
1133        iter != controllers.end(); ++iter) {
1134     SystemModalContainerLayoutManager* layout_manager =
1135         (*iter)->GetSystemModalLayoutManager(window);
1136     if (layout_manager && layout_manager->CanWindowReceiveEvents(window))
1137       return true;
1138     // Allow events to fall through to the virtual keyboard even if displaying
1139     // a system modal dialog.
1140     if ((*iter)->IsVirtualKeyboardWindow(window))
1141       return true;
1142   }
1143
1144   return false;
1145 }
1146
1147 ////////////////////////////////////////////////////////////////////////////////
1148 // Shell, ui::EventTarget overrides:
1149
1150 bool Shell::CanAcceptEvent(const ui::Event& event) {
1151   return true;
1152 }
1153
1154 ui::EventTarget* Shell::GetParentTarget() {
1155   return aura::Env::GetInstance();
1156 }
1157
1158 scoped_ptr<ui::EventTargetIterator> Shell::GetChildIterator() const {
1159   return scoped_ptr<ui::EventTargetIterator>();
1160 }
1161
1162 ui::EventTargeter* Shell::GetEventTargeter() {
1163   NOTREACHED();
1164   return NULL;
1165 }
1166
1167 void Shell::OnEvent(ui::Event* event) {
1168 }
1169
1170 ////////////////////////////////////////////////////////////////////////////////
1171 // Shell, aura::client::ActivationChangeObserver implementation:
1172
1173 void Shell::OnWindowActivated(aura::Window* gained_active,
1174                               aura::Window* lost_active) {
1175   if (gained_active)
1176     target_root_window_ = gained_active->GetRootWindow();
1177 }
1178
1179 }  // namespace ash