ash/shell.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ash/shell.h"
   6
   7 #include <algorithm>
   8 #include <string>
   9
  10 #include "ash/accelerators/accelerator_controller.h"
  11 #include "ash/accelerators/accelerator_delegate.h"
  12 #include "ash/accelerators/focus_manager_factory.h"
  13 #include "ash/accelerators/nested_accelerator_delegate.h"
  14 #include "ash/accelerometer/accelerometer_controller.h"
  15 #include "ash/ash_switches.h"
  16 #include "ash/autoclick/autoclick_controller.h"
  17 #include "ash/desktop_background/desktop_background_controller.h"
  18 #include "ash/desktop_background/desktop_background_view.h"
  19 #include "ash/desktop_background/user_wallpaper_delegate.h"
  20 #include "ash/display/cursor_window_controller.h"
  21 #include "ash/display/display_controller.h"
  22 #include "ash/display/display_manager.h"
  23 #include "ash/display/event_transformation_handler.h"
  24 #include "ash/display/mouse_cursor_event_filter.h"
  25 #include "ash/display/screen_position_controller.h"
  26 #include "ash/display/virtual_keyboard_window_controller.h"
  27 #include "ash/drag_drop/drag_drop_controller.h"
  28 #include "ash/first_run/first_run_helper_impl.h"
  29 #include "ash/focus_cycler.h"
  30 #include "ash/frame/custom_frame_view_ash.h"
  31 #include "ash/gpu_support.h"
  32 #include "ash/high_contrast/high_contrast_controller.h"
  33 #include "ash/host/ash_window_tree_host_init_params.h"
  34 #include "ash/keyboard_uma_event_filter.h"
  35 #include "ash/magnifier/magnification_controller.h"
  36 #include "ash/magnifier/partial_magnification_controller.h"
  37 #include "ash/media_delegate.h"
  38 #include "ash/new_window_delegate.h"
  39 #include "ash/root_window_controller.h"
  40 #include "ash/session/session_state_delegate.h"
  41 #include "ash/shelf/app_list_shelf_item_delegate.h"
  42 #include "ash/shelf/shelf_delegate.h"
  43 #include "ash/shelf/shelf_item_delegate.h"
  44 #include "ash/shelf/shelf_item_delegate_manager.h"
  45 #include "ash/shelf/shelf_layout_manager.h"
  46 #include "ash/shelf/shelf_model.h"
  47 #include "ash/shelf/shelf_widget.h"
  48 #include "ash/shelf/shelf_window_watcher.h"
  49 #include "ash/shell_delegate.h"
  50 #include "ash/shell_factory.h"
  51 #include "ash/shell_init_params.h"
  52 #include "ash/shell_window_ids.h"
  53 #include "ash/system/locale/locale_notification_controller.h"
  54 #include "ash/system/status_area_widget.h"
  55 #include "ash/system/tray/system_tray_delegate.h"
  56 #include "ash/system/tray/system_tray_notifier.h"
  57 #include "ash/wm/app_list_controller.h"
  58 #include "ash/wm/ash_focus_rules.h"
  59 #include "ash/wm/ash_native_cursor_manager.h"
  60 #include "ash/wm/coordinate_conversion.h"
  61 #include "ash/wm/event_client_impl.h"
  62 #include "ash/wm/lock_state_controller.h"
  63 #include "ash/wm/maximize_mode/maximize_mode_controller.h"
  64 #include "ash/wm/maximize_mode/maximize_mode_window_manager.h"
  65 #include "ash/wm/mru_window_tracker.h"
  66 #include "ash/wm/overlay_event_filter.h"
  67 #include "ash/wm/overview/window_selector_controller.h"
  68 #include "ash/wm/power_button_controller.h"
  69 #include "ash/wm/resize_shadow_controller.h"
  70 #include "ash/wm/root_window_layout_manager.h"
  71 #include "ash/wm/screen_dimmer.h"
  72 #include "ash/wm/system_gesture_event_filter.h"
  73 #include "ash/wm/system_modal_container_event_filter.h"
  74 #include "ash/wm/system_modal_container_layout_manager.h"
  75 #include "ash/wm/toplevel_window_event_handler.h"
  76 #include "ash/wm/video_detector.h"
  77 #include "ash/wm/window_animations.h"
  78 #include "ash/wm/window_cycle_controller.h"
  79 #include "ash/wm/window_positioner.h"
  80 #include "ash/wm/window_properties.h"
  81 #include "ash/wm/window_util.h"
  82 #include "ash/wm/workspace_controller.h"
  83 #include "base/bind.h"
  84 #include "base/debug/trace_event.h"
  85 #include "ui/aura/client/aura_constants.h"
  86 #include "ui/aura/env.h"
  87 #include "ui/aura/layout_manager.h"
  88 #include "ui/aura/window.h"
  89 #include "ui/aura/window_event_dispatcher.h"
  90 #include "ui/base/ui_base_switches.h"
  91 #include "ui/compositor/layer.h"
  92 #include "ui/compositor/layer_animator.h"
  93 #include "ui/events/event_target_iterator.h"
  94 #include "ui/gfx/display.h"
  95 #include "ui/gfx/image/image_skia.h"
  96 #include "ui/gfx/screen.h"
  97 #include "ui/gfx/size.h"
  98 #include "ui/keyboard/keyboard.h"
  99 #include "ui/keyboard/keyboard_controller.h"
 100 #include "ui/keyboard/keyboard_switches.h"
 101 #include "ui/keyboard/keyboard_util.h"
 102 #include "ui/message_center/message_center.h"
 103 #include "ui/views/corewm/tooltip_aura.h"
 104 #include "ui/views/corewm/tooltip_controller.h"
 105 #include "ui/views/focus/focus_manager_factory.h"
 106 #include "ui/views/widget/native_widget_aura.h"
 107 #include "ui/views/widget/widget.h"
 108 #include "ui/wm/core/accelerator_filter.h"
 109 #include "ui/wm/core/compound_event_filter.h"
 110 #include "ui/wm/core/focus_controller.h"
 111 #include "ui/wm/core/input_method_event_filter.h"
 112 #include "ui/wm/core/nested_accelerator_controller.h"
 113 #include "ui/wm/core/shadow_controller.h"
 114 #include "ui/wm/core/user_activity_detector.h"
 115 #include "ui/wm/core/visibility_controller.h"
 116 #include "ui/wm/core/window_modality_controller.h"
 117
 118 #if defined(OS_CHROMEOS)
 119 #if defined(USE_X11)
 120 #include "ash/accelerators/magnifier_key_scroller.h"
 121 #include "ash/accelerators/spoken_feedback_toggler.h"
 122 #include "ash/touch/touch_transformer_controller.h"
 123 #include "ui/gfx/x/x11_types.h"
 124 #endif  // defined(USE_X11)
 125 #include "ash/ash_constants.h"
 126 #include "ash/display/display_change_observer_chromeos.h"
 127 #include "ash/display/display_configurator_animation.h"
 128 #include "ash/display/display_error_observer_chromeos.h"
 129 #include "ash/display/projecting_observer_chromeos.h"
 130 #include "ash/display/resolution_notification_controller.h"
 131 #include "ash/sticky_keys/sticky_keys_controller.h"
 132 #include "ash/system/chromeos/bluetooth/bluetooth_notification_controller.h"
 133 #include "ash/system/chromeos/brightness/brightness_controller_chromeos.h"
 134 #include "ash/system/chromeos/power/power_event_observer.h"
 135 #include "ash/system/chromeos/power/power_status.h"
 136 #include "ash/system/chromeos/power/video_activity_notifier.h"
 137 #include "ash/system/chromeos/session/last_window_closed_logout_reminder.h"
 138 #include "ash/system/chromeos/session/logout_confirmation_controller.h"
 139 #include "base/bind_helpers.h"
 140 #include "base/sys_info.h"
 141 #include "ui/chromeos/user_activity_power_manager_notifier.h"
 142 #include "ui/display/chromeos/display_configurator.h"
 143 #endif  // defined(OS_CHROMEOS)
 144
 145 namespace ash {
 146
 147 namespace {
 148
 149 using aura::Window;
 150 using views::Widget;
 151
 152 // A Corewm VisibilityController subclass that calls the Ash animation routine
 153 // so we can pick up our extended animations. See ash/wm/window_animations.h.
 154 class AshVisibilityController : public ::wm::VisibilityController {
 155  public:
 156   AshVisibilityController() {}
 157   virtual ~AshVisibilityController() {}
 158
 159  private:
 160   // Overridden from ::wm::VisibilityController:
 161   virtual bool CallAnimateOnChildWindowVisibilityChanged(
 162       aura::Window* window,
 163       bool visible) OVERRIDE {
 164     return AnimateOnChildWindowVisibilityChanged(window, visible);
 165   }
 166
 167   DISALLOW_COPY_AND_ASSIGN(AshVisibilityController);
 168 };
 169
 170 AshWindowTreeHostInitParams ShellInitParamsToAshWindowTreeHostInitParams(
 171     const ShellInitParams& shell_init_params) {
 172   AshWindowTreeHostInitParams ash_init_params;
 173 #if defined(OS_WIN)
 174   ash_init_params.remote_hwnd = shell_init_params.remote_hwnd;
 175 #endif
 176   return ash_init_params;
 177 }
 178
 179 }  // namespace
 180
 181 // static
 182 Shell* Shell::instance_ = NULL;
 183 // static
 184 bool Shell::initially_hide_cursor_ = false;
 185
 186 ////////////////////////////////////////////////////////////////////////////////
 187 // Shell, public:
 188
 189 // static
 190 Shell* Shell::CreateInstance(const ShellInitParams& init_params) {
 191   CHECK(!instance_);
 192   instance_ = new Shell(init_params.delegate);
 193   instance_->Init(init_params);
 194   return instance_;
 195 }
 196
 197 // static
 198 Shell* Shell::GetInstance() {
 199   CHECK(instance_);
 200   return instance_;
 201 }
 202
 203 // static
 204 bool Shell::HasInstance() {
 205   return !!instance_;
 206 }
 207
 208 // static
 209 void Shell::DeleteInstance() {
 210   delete instance_;
 211   instance_ = NULL;
 212 }
 213
 214 // static
 215 RootWindowController* Shell::GetPrimaryRootWindowController() {
 216   CHECK(HasInstance());
 217   return GetRootWindowController(GetPrimaryRootWindow());
 218 }
 219
 220 // static
 221 Shell::RootWindowControllerList Shell::GetAllRootWindowControllers() {
 222   CHECK(HasInstance());
 223   return Shell::GetInstance()->display_controller()->
 224       GetAllRootWindowControllers();
 225 }
 226
 227 // static
 228 aura::Window* Shell::GetPrimaryRootWindow() {
 229   CHECK(HasInstance());
 230   return GetInstance()->display_controller()->GetPrimaryRootWindow();
 231 }
 232
 233 // static
 234 aura::Window* Shell::GetTargetRootWindow() {
 235   CHECK(HasInstance());
 236   Shell* shell = GetInstance();
 237   if (shell->scoped_target_root_window_)
 238     return shell->scoped_target_root_window_;
 239   return shell->target_root_window_;
 240 }
 241
 242 // static
 243 gfx::Screen* Shell::GetScreen() {
 244   return gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_ALTERNATE);
 245 }
 246
 247 // static
 248 aura::Window::Windows Shell::GetAllRootWindows() {
 249   CHECK(HasInstance());
 250   return Shell::GetInstance()->display_controller()->
 251       GetAllRootWindows();
 252 }
 253
 254 // static
 255 aura::Window* Shell::GetContainer(aura::Window* root_window,
 256                                   int container_id) {
 257   return root_window->GetChildById(container_id);
 258 }
 259
 260 // static
 261 const aura::Window* Shell::GetContainer(const aura::Window* root_window,
 262                                         int container_id) {
 263   return root_window->GetChildById(container_id);
 264 }
 265
 266 // static
 267 std::vector<aura::Window*> Shell::GetContainersFromAllRootWindows(
 268     int container_id,
 269     aura::Window* priority_root) {
 270   std::vector<aura::Window*> containers;
 271   aura::Window::Windows root_windows = GetAllRootWindows();
 272   for (aura::Window::Windows::const_iterator it = root_windows.begin();
 273        it != root_windows.end(); ++it) {
 274     aura::Window* container = (*it)->GetChildById(container_id);
 275     if (container) {
 276       if (priority_root && priority_root->Contains(container))
 277         containers.insert(containers.begin(), container);
 278       else
 279         containers.push_back(container);
 280     }
 281   }
 282   return containers;
 283 }
 284
 285 void Shell::ShowContextMenu(const gfx::Point& location_in_screen,
 286                             ui::MenuSourceType source_type) {
 287   // No context menus if there is no session with an active user.
 288   if (!session_state_delegate_->NumberOfLoggedInUsers())
 289     return;
 290   // No context menus when screen is locked.
 291   if (session_state_delegate_->IsScreenLocked())
 292     return;
 293
 294   aura::Window* root =
 295       wm::GetRootWindowMatching(gfx::Rect(location_in_screen, gfx::Size()));
 296   GetRootWindowController(root)
 297       ->ShowContextMenu(location_in_screen, source_type);
 298 }
 299
 300 void Shell::ShowAppList(aura::Window* window) {
 301   // If the context window is not given, show it on the target root window.
 302   if (!window)
 303     window = GetTargetRootWindow();
 304   if (!app_list_controller_)
 305     app_list_controller_.reset(new AppListController);
 306   app_list_controller_->Show(window);
 307 }
 308
 309 void Shell::DismissAppList() {
 310   if (!app_list_controller_)
 311     return;
 312   app_list_controller_->Dismiss();
 313 }
 314
 315 void Shell::ToggleAppList(aura::Window* window) {
 316   if (app_list_controller_ && app_list_controller_->IsVisible()) {
 317     DismissAppList();
 318     return;
 319   }
 320
 321   ShowAppList(window);
 322 }
 323
 324 bool Shell::GetAppListTargetVisibility() const {
 325   return app_list_controller_.get() &&
 326       app_list_controller_->GetTargetVisibility();
 327 }
 328
 329 aura::Window* Shell::GetAppListWindow() {
 330   return app_list_controller_.get() ? app_list_controller_->GetWindow() : NULL;
 331 }
 332
 333 app_list::AppListView* Shell::GetAppListView() {
 334   return app_list_controller_.get() ? app_list_controller_->GetView() : NULL;
 335 }
 336
 337 bool Shell::IsSystemModalWindowOpen() const {
 338   if (simulate_modal_window_open_for_testing_)
 339     return true;
 340   const std::vector<aura::Window*> containers = GetContainersFromAllRootWindows(
 341       kShellWindowId_SystemModalContainer, NULL);
 342   for (std::vector<aura::Window*>::const_iterator cit = containers.begin();
 343        cit != containers.end(); ++cit) {
 344     for (aura::Window::Windows::const_iterator wit = (*cit)->children().begin();
 345          wit != (*cit)->children().end(); ++wit) {
 346       if ((*wit)->GetProperty(aura::client::kModalKey) ==
 347           ui::MODAL_TYPE_SYSTEM && (*wit)->TargetVisibility()) {
 348         return true;
 349       }
 350     }
 351   }
 352   return false;
 353 }
 354
 355 views::NonClientFrameView* Shell::CreateDefaultNonClientFrameView(
 356     views::Widget* widget) {
 357   // Use translucent-style window frames for dialogs.
 358   return new CustomFrameViewAsh(widget);
 359 }
 360
 361 void Shell::RotateFocus(Direction direction) {
 362   focus_cycler_->RotateFocus(direction == FORWARD ? FocusCycler::FORWARD
 363                                                   : FocusCycler::BACKWARD);
 364 }
 365
 366 void Shell::SetDisplayWorkAreaInsets(Window* contains,
 367                                      const gfx::Insets& insets) {
 368   if (!display_controller_->UpdateWorkAreaOfDisplayNearestWindow(
 369           contains, insets)) {
 370     return;
 371   }
 372   FOR_EACH_OBSERVER(ShellObserver, observers_,
 373                     OnDisplayWorkAreaInsetsChanged());
 374 }
 375
 376 void Shell::OnLoginStateChanged(user::LoginStatus status) {
 377   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLoginStateChanged(status));
 378 }
 379
 380 void Shell::OnLoginUserProfilePrepared() {
 381   CreateShelf();
 382   CreateKeyboard();
 383 }
 384
 385 void Shell::UpdateAfterLoginStatusChange(user::LoginStatus status) {
 386   RootWindowControllerList controllers = GetAllRootWindowControllers();
 387   for (RootWindowControllerList::iterator iter = controllers.begin();
 388        iter != controllers.end(); ++iter)
 389     (*iter)->UpdateAfterLoginStatusChange(status);
 390 }
 391
 392 void Shell::OnAppTerminating() {
 393   FOR_EACH_OBSERVER(ShellObserver, observers_, OnAppTerminating());
 394 }
 395
 396 void Shell::OnLockStateChanged(bool locked) {
 397   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLockStateChanged(locked));
 398 #ifndef NDEBUG
 399   // Make sure that there is no system modal in Lock layer when unlocked.
 400   if (!locked) {
 401     std::vector<aura::Window*> containers = GetContainersFromAllRootWindows(
 402         kShellWindowId_LockSystemModalContainer, GetPrimaryRootWindow());
 403     for (std::vector<aura::Window*>::const_iterator iter = containers.begin();
 404          iter != containers.end(); ++iter) {
 405       DCHECK_EQ(0u, (*iter)->children().size());
 406     }
 407   }
 408 #endif
 409 }
 410
 411 void Shell::OnCastingSessionStartedOrStopped(bool started) {
 412 #if defined(OS_CHROMEOS) && defined(USE_X11)
 413   if (projecting_observer_)
 414     projecting_observer_->OnCastingSessionStartedOrStopped(started);
 415 #endif
 416 }
 417
 418 void Shell::OnOverviewModeStarting() {
 419   FOR_EACH_OBSERVER(ShellObserver, observers_, OnOverviewModeStarting());
 420 }
 421
 422 void Shell::OnOverviewModeEnding() {
 423   FOR_EACH_OBSERVER(ShellObserver, observers_, OnOverviewModeEnding());
 424 }
 425
 426 void Shell::OnMaximizeModeStarted() {
 427   FOR_EACH_OBSERVER(ShellObserver, observers_, OnMaximizeModeStarted());
 428 }
 429
 430 void Shell::OnMaximizeModeEnded() {
 431   FOR_EACH_OBSERVER(ShellObserver, observers_, OnMaximizeModeEnded());
 432 }
 433
 434 void Shell::OnRootWindowAdded(aura::Window* root_window) {
 435   FOR_EACH_OBSERVER(ShellObserver, observers_, OnRootWindowAdded(root_window));
 436 }
 437
 438 void Shell::CreateShelf() {
 439   RootWindowControllerList controllers = GetAllRootWindowControllers();
 440   for (RootWindowControllerList::iterator iter = controllers.begin();
 441        iter != controllers.end(); ++iter)
 442     (*iter)->shelf()->CreateShelf();
 443 }
 444
 445 void Shell::OnShelfCreatedForRootWindow(aura::Window* root_window) {
 446   FOR_EACH_OBSERVER(ShellObserver,
 447                     observers_,
 448                     OnShelfCreatedForRootWindow(root_window));
 449 }
 450
 451 void Shell::CreateKeyboard() {
 452   // TODO(bshe): Primary root window controller may not be the controller to
 453   // attach virtual keyboard. See http://crbug.com/303429
 454   InitKeyboard();
 455   if (keyboard::IsKeyboardUsabilityExperimentEnabled()) {
 456     display_controller()->virtual_keyboard_window_controller()->
 457         ActivateKeyboard(keyboard::KeyboardController::GetInstance());
 458   } else {
 459     GetPrimaryRootWindowController()->
 460         ActivateKeyboard(keyboard::KeyboardController::GetInstance());
 461   }
 462 }
 463
 464 void Shell::DeactivateKeyboard() {
 465   if (keyboard::KeyboardController::GetInstance()) {
 466     RootWindowControllerList controllers = GetAllRootWindowControllers();
 467     for (RootWindowControllerList::iterator iter = controllers.begin();
 468         iter != controllers.end(); ++iter) {
 469       (*iter)->DeactivateKeyboard(keyboard::KeyboardController::GetInstance());
 470     }
 471   }
 472   keyboard::KeyboardController::ResetInstance(NULL);
 473 }
 474
 475 void Shell::ShowShelf() {
 476   RootWindowControllerList controllers = GetAllRootWindowControllers();
 477   for (RootWindowControllerList::iterator iter = controllers.begin();
 478        iter != controllers.end(); ++iter)
 479     (*iter)->ShowShelf();
 480 }
 481
 482 void Shell::AddShellObserver(ShellObserver* observer) {
 483   observers_.AddObserver(observer);
 484 }
 485
 486 void Shell::RemoveShellObserver(ShellObserver* observer) {
 487   observers_.RemoveObserver(observer);
 488 }
 489
 490 #if defined(OS_CHROMEOS)
 491 bool Shell::ShouldSaveDisplaySettings() {
 492   return !((maximize_mode_controller_->IsMaximizeModeWindowManagerEnabled() &&
 493             maximize_mode_controller_->
 494                 ignore_display_configuration_updates()) ||
 495            resolution_notification_controller_->DoesNotificationTimeout());
 496 }
 497 #endif
 498
 499 void Shell::UpdateShelfVisibility() {
 500   RootWindowControllerList controllers = GetAllRootWindowControllers();
 501   for (RootWindowControllerList::iterator iter = controllers.begin();
 502        iter != controllers.end(); ++iter)
 503     if ((*iter)->shelf())
 504       (*iter)->UpdateShelfVisibility();
 505 }
 506
 507 void Shell::SetShelfAutoHideBehavior(ShelfAutoHideBehavior behavior,
 508                                      aura::Window* root_window) {
 509   ash::ShelfLayoutManager::ForShelf(root_window)->SetAutoHideBehavior(behavior);
 510 }
 511
 512 ShelfAutoHideBehavior Shell::GetShelfAutoHideBehavior(
 513     aura::Window* root_window) const {
 514   return ash::ShelfLayoutManager::ForShelf(root_window)->auto_hide_behavior();
 515 }
 516
 517 void Shell::SetShelfAlignment(ShelfAlignment alignment,
 518                               aura::Window* root_window) {
 519   if (ash::ShelfLayoutManager::ForShelf(root_window)->SetAlignment(alignment)) {
 520     FOR_EACH_OBSERVER(
 521         ShellObserver, observers_, OnShelfAlignmentChanged(root_window));
 522   }
 523 }
 524
 525 ShelfAlignment Shell::GetShelfAlignment(const aura::Window* root_window) {
 526   return GetRootWindowController(root_window)
 527       ->GetShelfLayoutManager()
 528       ->GetAlignment();
 529 }
 530
 531 void Shell::SetDimming(bool should_dim) {
 532   RootWindowControllerList controllers = GetAllRootWindowControllers();
 533   for (RootWindowControllerList::iterator iter = controllers.begin();
 534        iter != controllers.end(); ++iter)
 535     (*iter)->screen_dimmer()->SetDimming(should_dim);
 536 }
 537
 538 void Shell::NotifyFullscreenStateChange(bool is_fullscreen,
 539                                         aura::Window* root_window) {
 540   FOR_EACH_OBSERVER(ShellObserver, observers_, OnFullscreenStateChanged(
 541       is_fullscreen, root_window));
 542 }
 543
 544 void Shell::CreateModalBackground(aura::Window* window) {
 545   if (!modality_filter_) {
 546     modality_filter_.reset(new SystemModalContainerEventFilter(this));
 547     AddPreTargetHandler(modality_filter_.get());
 548   }
 549   RootWindowControllerList controllers = GetAllRootWindowControllers();
 550   for (RootWindowControllerList::iterator iter = controllers.begin();
 551        iter != controllers.end(); ++iter)
 552     (*iter)->GetSystemModalLayoutManager(window)->CreateModalBackground();
 553 }
 554
 555 void Shell::OnModalWindowRemoved(aura::Window* removed) {
 556   RootWindowControllerList controllers = GetAllRootWindowControllers();
 557   bool activated = false;
 558   for (RootWindowControllerList::iterator iter = controllers.begin();
 559        iter != controllers.end() && !activated; ++iter) {
 560     activated = (*iter)->GetSystemModalLayoutManager(removed)->
 561         ActivateNextModalWindow();
 562   }
 563   if (!activated) {
 564     RemovePreTargetHandler(modality_filter_.get());
 565     modality_filter_.reset();
 566     for (RootWindowControllerList::iterator iter = controllers.begin();
 567          iter != controllers.end(); ++iter)
 568       (*iter)->GetSystemModalLayoutManager(removed)->DestroyModalBackground();
 569   }
 570 }
 571
 572 WebNotificationTray* Shell::GetWebNotificationTray() {
 573   return GetPrimaryRootWindowController()->shelf()->
 574       status_area_widget()->web_notification_tray();
 575 }
 576
 577 bool Shell::HasPrimaryStatusArea() {
 578   ShelfWidget* shelf = GetPrimaryRootWindowController()->shelf();
 579   return shelf && shelf->status_area_widget();
 580 }
 581
 582 SystemTray* Shell::GetPrimarySystemTray() {
 583   return GetPrimaryRootWindowController()->GetSystemTray();
 584 }
 585
 586 ShelfDelegate* Shell::GetShelfDelegate() {
 587   if (!shelf_delegate_) {
 588     shelf_model_.reset(new ShelfModel);
 589     // Creates ShelfItemDelegateManager before ShelfDelegate.
 590     shelf_item_delegate_manager_.reset(
 591         new ShelfItemDelegateManager(shelf_model_.get()));
 592
 593     shelf_delegate_.reset(delegate_->CreateShelfDelegate(shelf_model_.get()));
 594     scoped_ptr<ShelfItemDelegate> controller(new AppListShelfItemDelegate);
 595
 596     // Finding the shelf model's location of the app list and setting its
 597     // ShelfItemDelegate.
 598     int app_list_index = shelf_model_->GetItemIndexForType(TYPE_APP_LIST);
 599     DCHECK_GE(app_list_index, 0);
 600     ShelfID app_list_id = shelf_model_->items()[app_list_index].id;
 601     DCHECK(app_list_id);
 602     shelf_item_delegate_manager_->SetShelfItemDelegate(app_list_id,
 603                                                        controller.Pass());
 604     shelf_window_watcher_.reset(new ShelfWindowWatcher(
 605         shelf_model_.get(), shelf_item_delegate_manager_.get()));
 606   }
 607   return shelf_delegate_.get();
 608 }
 609
 610 void Shell::SetTouchHudProjectionEnabled(bool enabled) {
 611   if (is_touch_hud_projection_enabled_ == enabled)
 612     return;
 613
 614   is_touch_hud_projection_enabled_ = enabled;
 615   FOR_EACH_OBSERVER(ShellObserver, observers_,
 616                     OnTouchHudProjectionToggled(enabled));
 617 }
 618
 619 #if defined(OS_CHROMEOS)
 620 ash::FirstRunHelper* Shell::CreateFirstRunHelper() {
 621   return new ash::FirstRunHelperImpl;
 622 }
 623
 624 void Shell::SetCursorCompositingEnabled(bool enabled) {
 625   display_controller_->cursor_window_controller()->SetCursorCompositingEnabled(
 626       enabled);
 627   native_cursor_manager_->SetNativeCursorEnabled(!enabled);
 628 }
 629 #endif  // defined(OS_CHROMEOS)
 630
 631 void Shell::DoInitialWorkspaceAnimation() {
 632   return GetPrimaryRootWindowController()->workspace_controller()->
 633       DoInitialAnimation();
 634 }
 635
 636 ////////////////////////////////////////////////////////////////////////////////
 637 // Shell, private:
 638
 639 Shell::Shell(ShellDelegate* delegate)
 640     : target_root_window_(NULL),
 641       scoped_target_root_window_(NULL),
 642       delegate_(delegate),
 643       window_positioner_(new WindowPositioner),
 644       activation_client_(NULL),
 645       accelerometer_controller_(new AccelerometerController()),
 646 #if defined(OS_CHROMEOS)
 647       display_configurator_(new ui::DisplayConfigurator()),
 648 #endif  // defined(OS_CHROMEOS)
 649       native_cursor_manager_(new AshNativeCursorManager),
 650       cursor_manager_(
 651           scoped_ptr< ::wm::NativeCursorManager>(native_cursor_manager_)),
 652       simulate_modal_window_open_for_testing_(false),
 653       is_touch_hud_projection_enabled_(false) {
 654   DCHECK(delegate_.get());
 655   gpu_support_.reset(delegate_->CreateGPUSupport());
 656   display_manager_.reset(new DisplayManager);
 657   display_controller_.reset(new DisplayController);
 658 #if defined(OS_CHROMEOS) && defined(USE_X11)
 659   user_metrics_recorder_.reset(new UserMetricsRecorder);
 660 #endif  // defined(OS_CHROMEOS)
 661
 662 #if defined(OS_CHROMEOS)
 663   PowerStatus::Initialize();
 664 #endif
 665 }
 666
 667 Shell::~Shell() {
 668   TRACE_EVENT0("shutdown", "ash::Shell::Destructor");
 669
 670   delegate_->PreShutdown();
 671
 672   views::FocusManagerFactory::Install(NULL);
 673
 674   // Remove the focus from any window. This will prevent overhead and side
 675   // effects (e.g. crashes) from changing focus during shutdown.
 676   // See bug crbug.com/134502.
 677   aura::client::GetFocusClient(GetPrimaryRootWindow())->FocusWindow(NULL);
 678
 679   // Please keep in same order as in Init() because it's easy to miss one.
 680   if (window_modality_controller_)
 681     window_modality_controller_.reset();
 682 #if defined(OS_CHROMEOS) && defined(USE_X11)
 683   RemovePreTargetHandler(magnifier_key_scroll_handler_.get());
 684   magnifier_key_scroll_handler_.reset();
 685
 686   RemovePreTargetHandler(speech_feedback_handler_.get());
 687   speech_feedback_handler_.reset();
 688 #endif
 689   RemovePreTargetHandler(user_activity_detector_.get());
 690   RemovePreTargetHandler(overlay_filter_.get());
 691   RemovePreTargetHandler(input_method_filter_.get());
 692   RemovePreTargetHandler(accelerator_filter_.get());
 693   RemovePreTargetHandler(event_transformation_handler_.get());
 694   RemovePreTargetHandler(toplevel_window_event_handler_.get());
 695   RemovePostTargetHandler(toplevel_window_event_handler_.get());
 696   RemovePreTargetHandler(system_gesture_filter_.get());
 697   RemovePreTargetHandler(keyboard_metrics_filter_.get());
 698   RemovePreTargetHandler(mouse_cursor_filter_.get());
 699
 700   // TooltipController is deleted with the Shell so removing its references.
 701   RemovePreTargetHandler(tooltip_controller_.get());
 702
 703   // Destroy maximize mode controller early on since it has some observers which
 704   // need to be removed.
 705   maximize_mode_controller_->Shutdown();
 706   maximize_mode_controller_.reset();
 707
 708   // AppList needs to be released before shelf layout manager, which is
 709   // destroyed with shelf container in the loop below. However, app list
 710   // container is now on top of shelf container and released after it.
 711   // TODO(xiyuan): Move it back when app list container is no longer needed.
 712   app_list_controller_.reset();
 713
 714 #if defined(OS_CHROMEOS)
 715   // Destroy the LastWindowClosedLogoutReminder before the
 716   // LogoutConfirmationController.
 717   last_window_closed_logout_reminder_.reset();
 718
 719   // Destroy the LogoutConfirmationController before the SystemTrayDelegate.
 720   logout_confirmation_controller_.reset();
 721 #endif
 722
 723   // Destroy SystemTrayDelegate before destroying the status area(s).
 724   system_tray_delegate_->Shutdown();
 725   system_tray_delegate_.reset();
 726
 727   locale_notification_controller_.reset();
 728
 729   // Drag-and-drop must be canceled prior to close all windows.
 730   drag_drop_controller_.reset();
 731
 732   // Controllers who have WindowObserver added must be deleted
 733   // before |display_controller_| is deleted.
 734
 735 #if defined(OS_CHROMEOS)
 736   // VideoActivityNotifier must be deleted before |video_detector_| is
 737   // deleted because it's observing video activity through
 738   // VideoDetectorObserver interface.
 739   video_activity_notifier_.reset();
 740 #endif  // defined(OS_CHROMEOS)
 741   video_detector_.reset();
 742   high_contrast_controller_.reset();
 743
 744   shadow_controller_.reset();
 745   resize_shadow_controller_.reset();
 746
 747   window_cycle_controller_.reset();
 748   window_selector_controller_.reset();
 749   mru_window_tracker_.reset();
 750
 751   // |shelf_window_watcher_| has a weak pointer to |shelf_Model_|
 752   // and has window observers.
 753   shelf_window_watcher_.reset();
 754
 755   // Destroy all child windows including widgets.
 756   display_controller_->CloseChildWindows();
 757   display_controller_->CloseNonDesktopDisplay();
 758
 759   // Chrome implementation of shelf delegate depends on FocusClient,
 760   // so must be deleted before |focus_client_|.
 761   shelf_delegate_.reset();
 762   focus_client_.reset();
 763
 764   // Destroy SystemTrayNotifier after destroying SystemTray as TrayItems
 765   // needs to remove observers from it.
 766   system_tray_notifier_.reset();
 767
 768   // These need a valid Shell instance to clean up properly, so explicitly
 769   // delete them before invalidating the instance.
 770   // Alphabetical. TODO(oshima): sort.
 771   magnification_controller_.reset();
 772   partial_magnification_controller_.reset();
 773   tooltip_controller_.reset();
 774   event_client_.reset();
 775   nested_accelerator_controller_.reset();
 776   toplevel_window_event_handler_.reset();
 777   visibility_controller_.reset();
 778   // |shelf_item_delegate_manager_| observes |shelf_model_|. It must be
 779   // destroyed before |shelf_model_| is destroyed.
 780   shelf_item_delegate_manager_.reset();
 781   shelf_model_.reset();
 782
 783   power_button_controller_.reset();
 784   lock_state_controller_.reset();
 785
 786 #if defined(OS_CHROMEOS)
 787   resolution_notification_controller_.reset();
 788 #endif
 789   desktop_background_controller_.reset();
 790   mouse_cursor_filter_.reset();
 791
 792 #if defined(OS_CHROMEOS) && defined(USE_X11)
 793   touch_transformer_controller_.reset();
 794 #endif  // defined(OS_CHROMEOS) && defined(USE_X11)
 795
 796   // This also deletes all RootWindows. Note that we invoke Shutdown() on
 797   // DisplayController before resetting |display_controller_|, since destruction
 798   // of its owned RootWindowControllers relies on the value.
 799   display_manager_->CreateScreenForShutdown();
 800   display_controller_->Shutdown();
 801   display_controller_.reset();
 802   screen_position_controller_.reset();
 803   accessibility_delegate_.reset();
 804   new_window_delegate_.reset();
 805   media_delegate_.reset();
 806
 807   keyboard::KeyboardController::ResetInstance(NULL);
 808
 809 #if defined(OS_CHROMEOS)
 810   if (display_change_observer_)
 811     display_configurator_->RemoveObserver(display_change_observer_.get());
 812   if (display_configurator_animation_)
 813     display_configurator_->RemoveObserver(
 814         display_configurator_animation_.get());
 815   if (display_error_observer_)
 816     display_configurator_->RemoveObserver(display_error_observer_.get());
 817   if (projecting_observer_)
 818     display_configurator_->RemoveObserver(projecting_observer_.get());
 819   display_change_observer_.reset();
 820 #endif  // defined(OS_CHROMEOS)
 821
 822 #if defined(OS_CHROMEOS)
 823   PowerStatus::Shutdown();
 824 #endif
 825
 826   DCHECK(instance_ == this);
 827   instance_ = NULL;
 828 }
 829
 830 void Shell::Init(const ShellInitParams& init_params) {
 831   delegate_->PreInit();
 832   if (keyboard::IsKeyboardUsabilityExperimentEnabled()) {
 833     display_manager_->SetSecondDisplayMode(DisplayManager::VIRTUAL_KEYBOARD);
 834   }
 835   bool display_initialized = display_manager_->InitFromCommandLine();
 836 #if defined(OS_CHROMEOS)
 837   display_configurator_->Init(!gpu_support_->IsPanelFittingDisabled());
 838   display_configurator_animation_.reset(new DisplayConfiguratorAnimation());
 839   display_configurator_->AddObserver(display_configurator_animation_.get());
 840
 841   projecting_observer_.reset(new ProjectingObserver());
 842   display_configurator_->AddObserver(projecting_observer_.get());
 843
 844   if (!display_initialized && base::SysInfo::IsRunningOnChromeOS()) {
 845     display_change_observer_.reset(new DisplayChangeObserver);
 846     // Register |display_change_observer_| first so that the rest of
 847     // observer gets invoked after the root windows are configured.
 848     display_configurator_->AddObserver(display_change_observer_.get());
 849     display_error_observer_.reset(new DisplayErrorObserver());
 850     display_configurator_->AddObserver(display_error_observer_.get());
 851     display_configurator_->set_state_controller(display_change_observer_.get());
 852     display_configurator_->set_mirroring_controller(display_manager_.get());
 853     display_configurator_->ForceInitialConfigure(
 854         delegate_->IsFirstRunAfterBoot() ? kChromeOsBootColor : 0);
 855     display_initialized = true;
 856   }
 857 #endif  // defined(OS_CHROMEOS)
 858   if (!display_initialized)
 859     display_manager_->InitDefaultDisplay();
 860
 861   display_manager_->InitFontParams();
 862
 863   // Install the custom factory first so that views::FocusManagers for Tray,
 864   // Shelf, and WallPaper could be created by the factory.
 865   views::FocusManagerFactory::Install(new AshFocusManagerFactory);
 866
 867   aura::Env::CreateInstance(true);
 868   aura::Env::GetInstance()->set_context_factory(init_params.context_factory);
 869
 870   // The WindowModalityController needs to be at the front of the input event
 871   // pretarget handler list to ensure that it processes input events when modal
 872   // windows are active.
 873   window_modality_controller_.reset(
 874       new ::wm::WindowModalityController(this));
 875
 876   env_filter_.reset(new ::wm::CompoundEventFilter);
 877   AddPreTargetHandler(env_filter_.get());
 878
 879   ::wm::FocusController* focus_controller =
 880       new ::wm::FocusController(new wm::AshFocusRules);
 881   focus_client_.reset(focus_controller);
 882   activation_client_ = focus_controller;
 883   activation_client_->AddObserver(this);
 884   focus_cycler_.reset(new FocusCycler());
 885
 886   screen_position_controller_.reset(new ScreenPositionController);
 887
 888   display_controller_->Start();
 889   display_controller_->CreatePrimaryHost(
 890       ShellInitParamsToAshWindowTreeHostInitParams(init_params));
 891   aura::Window* root_window = display_controller_->GetPrimaryRootWindow();
 892   target_root_window_ = root_window;
 893
 894 #if defined(OS_CHROMEOS)
 895   resolution_notification_controller_.reset(
 896       new ResolutionNotificationController);
 897 #endif
 898
 899   cursor_manager_.SetDisplay(GetScreen()->GetPrimaryDisplay());
 900
 901   nested_accelerator_controller_.reset(
 902       new ::wm::NestedAcceleratorController(new NestedAcceleratorDelegate));
 903   accelerator_controller_.reset(new AcceleratorController);
 904   maximize_mode_controller_.reset(new MaximizeModeController());
 905
 906 #if defined(OS_CHROMEOS) && defined(USE_X11)
 907   magnifier_key_scroll_handler_ = MagnifierKeyScroller::CreateHandler().Pass();
 908   AddPreTargetHandler(magnifier_key_scroll_handler_.get());
 909   speech_feedback_handler_ = SpokenFeedbackToggler::CreateHandler().Pass();
 910   AddPreTargetHandler(speech_feedback_handler_.get());
 911 #endif
 912
 913   // The order in which event filters are added is significant.
 914
 915   // wm::UserActivityDetector passes events to observers, so let them get
 916   // rewritten first.
 917   user_activity_detector_.reset(new ::wm::UserActivityDetector);
 918   AddPreTargetHandler(user_activity_detector_.get());
 919
 920   overlay_filter_.reset(new OverlayEventFilter);
 921   AddPreTargetHandler(overlay_filter_.get());
 922   AddShellObserver(overlay_filter_.get());
 923
 924   input_method_filter_.reset(new ::wm::InputMethodEventFilter(
 925       root_window->GetHost()->GetAcceleratedWidget()));
 926   AddPreTargetHandler(input_method_filter_.get());
 927
 928   accelerator_filter_.reset(new ::wm::AcceleratorFilter(
 929       scoped_ptr< ::wm::AcceleratorDelegate>(new AcceleratorDelegate).Pass()));
 930   AddPreTargetHandler(accelerator_filter_.get());
 931
 932   event_transformation_handler_.reset(new EventTransformationHandler);
 933   AddPreTargetHandler(event_transformation_handler_.get());
 934
 935   toplevel_window_event_handler_.reset(new ToplevelWindowEventHandler);
 936
 937   system_gesture_filter_.reset(new SystemGestureEventFilter);
 938   AddPreTargetHandler(system_gesture_filter_.get());
 939
 940   keyboard_metrics_filter_.reset(new KeyboardUMAEventFilter);
 941   AddPreTargetHandler(keyboard_metrics_filter_.get());
 942
 943   // The keyboard system must be initialized before the RootWindowController is
 944   // created.
 945 #if defined(OS_CHROMEOS)
 946     keyboard::InitializeKeyboard();
 947 #endif
 948
 949 #if defined(OS_CHROMEOS)
 950   sticky_keys_controller_.reset(new StickyKeysController);
 951 #endif
 952
 953   lock_state_controller_.reset(new LockStateController);
 954   power_button_controller_.reset(new PowerButtonController(
 955       lock_state_controller_.get()));
 956 #if defined(OS_CHROMEOS)
 957   // Pass the initial display state to PowerButtonController.
 958   power_button_controller_->OnDisplayModeChanged(
 959       display_configurator_->cached_displays());
 960 #endif
 961   AddShellObserver(lock_state_controller_.get());
 962
 963   drag_drop_controller_.reset(new DragDropController);
 964   mouse_cursor_filter_.reset(new MouseCursorEventFilter());
 965   PrependPreTargetHandler(mouse_cursor_filter_.get());
 966
 967   // Create Controllers that may need root window.
 968   // TODO(oshima): Move as many controllers before creating
 969   // RootWindowController as possible.
 970   visibility_controller_.reset(new AshVisibilityController);
 971
 972   magnification_controller_.reset(
 973       MagnificationController::CreateInstance());
 974   mru_window_tracker_.reset(new MruWindowTracker(activation_client_));
 975
 976   partial_magnification_controller_.reset(
 977       new PartialMagnificationController());
 978
 979   autoclick_controller_.reset(AutoclickController::CreateInstance());
 980
 981   high_contrast_controller_.reset(new HighContrastController);
 982   video_detector_.reset(new VideoDetector);
 983   window_selector_controller_.reset(new WindowSelectorController());
 984   window_cycle_controller_.reset(new WindowCycleController());
 985
 986   tooltip_controller_.reset(
 987       new views::corewm::TooltipController(
 988           scoped_ptr<views::corewm::Tooltip>(
 989               new views::corewm::TooltipAura(gfx::SCREEN_TYPE_ALTERNATE))));
 990   AddPreTargetHandler(tooltip_controller_.get());
 991
 992   event_client_.reset(new EventClientImpl);
 993
 994   // This controller needs to be set before SetupManagedWindowMode.
 995   desktop_background_controller_.reset(new DesktopBackgroundController());
 996   user_wallpaper_delegate_.reset(delegate_->CreateUserWallpaperDelegate());
 997
 998   session_state_delegate_.reset(delegate_->CreateSessionStateDelegate());
 999   accessibility_delegate_.reset(delegate_->CreateAccessibilityDelegate());
1000   new_window_delegate_.reset(delegate_->CreateNewWindowDelegate());
1001   media_delegate_.reset(delegate_->CreateMediaDelegate());
1002
1003   resize_shadow_controller_.reset(new ResizeShadowController());
1004   shadow_controller_.reset(
1005       new ::wm::ShadowController(activation_client_));
1006
1007   // Create system_tray_notifier_ before the delegate.
1008   system_tray_notifier_.reset(new ash::SystemTrayNotifier());
1009
1010   // Initialize system_tray_delegate_ before initializing StatusAreaWidget.
1011   system_tray_delegate_.reset(delegate()->CreateSystemTrayDelegate());
1012   DCHECK(system_tray_delegate_.get());
1013
1014   locale_notification_controller_.reset(new LocaleNotificationController);
1015
1016   // Initialize system_tray_delegate_ after StatusAreaWidget is created.
1017   system_tray_delegate_->Initialize();
1018
1019 #if defined(OS_CHROMEOS)
1020   // Create the LogoutConfirmationController after the SystemTrayDelegate.
1021   logout_confirmation_controller_.reset(new LogoutConfirmationController(
1022       base::Bind(&SystemTrayDelegate::SignOut,
1023                  base::Unretained(system_tray_delegate_.get()))));
1024 #endif
1025
1026 #if defined(OS_CHROMEOS) && defined(USE_X11)
1027   // Create TouchTransformerController before DisplayController::InitDisplays()
1028   // since TouchTransformerController listens on
1029   // DisplayController::Observer::OnDisplaysInitialized().
1030   touch_transformer_controller_.reset(new TouchTransformerController());
1031 #endif  // defined(OS_CHROMEOS) && defined(USE_X11)
1032
1033   display_controller_->InitDisplays();
1034
1035   // It needs to be created after RootWindowController has been created
1036   // (which calls OnWindowResized has been called, otherwise the
1037   // widget will not paint when restoring after a browser crash.  Also it needs
1038   // to be created after InitSecondaryDisplays() to initialize the wallpapers in
1039   // the correct size.
1040   user_wallpaper_delegate_->InitializeWallpaper();
1041
1042   if (initially_hide_cursor_)
1043     cursor_manager_.HideCursor();
1044   cursor_manager_.SetCursor(ui::kCursorPointer);
1045
1046 #if defined(OS_CHROMEOS)
1047   // Set accelerator controller delegates.
1048   accelerator_controller_->SetBrightnessControlDelegate(
1049       scoped_ptr<ash::BrightnessControlDelegate>(
1050           new ash::system::BrightnessControllerChromeos).Pass());
1051
1052   power_event_observer_.reset(new PowerEventObserver());
1053   user_activity_notifier_.reset(
1054       new ui::UserActivityPowerManagerNotifier(user_activity_detector_.get()));
1055   video_activity_notifier_.reset(
1056       new VideoActivityNotifier(video_detector_.get()));
1057   bluetooth_notification_controller_.reset(new BluetoothNotificationController);
1058   last_window_closed_logout_reminder_.reset(new LastWindowClosedLogoutReminder);
1059 #endif
1060
1061   weak_display_manager_factory_.reset(
1062       new base::WeakPtrFactory<DisplayManager>(display_manager_.get()));
1063   // The compositor thread and main message loop have to be running in
1064   // order to create mirror window. Run it after the main message loop
1065   // is started.
1066   base::MessageLoopForUI::current()->PostTask(
1067       FROM_HERE,
1068       base::Bind(&DisplayManager::CreateMirrorWindowIfAny,
1069                  weak_display_manager_factory_->GetWeakPtr()));
1070 }
1071
1072 void Shell::InitKeyboard() {
1073   if (keyboard::IsKeyboardEnabled()) {
1074     if (keyboard::KeyboardController::GetInstance()) {
1075       RootWindowControllerList controllers = GetAllRootWindowControllers();
1076       for (RootWindowControllerList::iterator iter = controllers.begin();
1077            iter != controllers.end(); ++iter) {
1078         (*iter)->DeactivateKeyboard(
1079             keyboard::KeyboardController::GetInstance());
1080       }
1081     }
1082     keyboard::KeyboardControllerProxy* proxy =
1083         delegate_->CreateKeyboardControllerProxy();
1084     keyboard::KeyboardController::ResetInstance(
1085         new keyboard::KeyboardController(proxy));
1086   }
1087 }
1088
1089 void Shell::InitRootWindow(aura::Window* root_window) {
1090   DCHECK(activation_client_);
1091   DCHECK(visibility_controller_.get());
1092   DCHECK(drag_drop_controller_.get());
1093
1094   aura::client::SetFocusClient(root_window, focus_client_.get());
1095   input_method_filter_->SetInputMethodPropertyInRootWindow(root_window);
1096   aura::client::SetActivationClient(root_window, activation_client_);
1097   ::wm::FocusController* focus_controller =
1098       static_cast< ::wm::FocusController*>(activation_client_);
1099   root_window->AddPreTargetHandler(focus_controller);
1100   aura::client::SetVisibilityClient(root_window, visibility_controller_.get());
1101   aura::client::SetDragDropClient(root_window, drag_drop_controller_.get());
1102   aura::client::SetScreenPositionClient(root_window,
1103                                         screen_position_controller_.get());
1104   aura::client::SetCursorClient(root_window, &cursor_manager_);
1105   aura::client::SetTooltipClient(root_window, tooltip_controller_.get());
1106   aura::client::SetEventClient(root_window, event_client_.get());
1107
1108   aura::client::SetWindowMoveClient(root_window,
1109       toplevel_window_event_handler_.get());
1110   root_window->AddPreTargetHandler(toplevel_window_event_handler_.get());
1111   root_window->AddPostTargetHandler(toplevel_window_event_handler_.get());
1112
1113   if (nested_accelerator_controller_) {
1114     aura::client::SetDispatcherClient(root_window,
1115                                       nested_accelerator_controller_.get());
1116   }
1117 }
1118
1119 bool Shell::CanWindowReceiveEvents(aura::Window* window) {
1120   RootWindowControllerList controllers = GetAllRootWindowControllers();
1121   for (RootWindowControllerList::iterator iter = controllers.begin();
1122        iter != controllers.end(); ++iter) {
1123     SystemModalContainerLayoutManager* layout_manager =
1124         (*iter)->GetSystemModalLayoutManager(window);
1125     if (layout_manager && layout_manager->CanWindowReceiveEvents(window))
1126       return true;
1127     // Allow events to fall through to the virtual keyboard even if displaying
1128     // a system modal dialog.
1129     if ((*iter)->IsVirtualKeyboardWindow(window))
1130       return true;
1131   }
1132
1133   return false;
1134 }
1135
1136 ////////////////////////////////////////////////////////////////////////////////
1137 // Shell, ui::EventTarget overrides:
1138
1139 bool Shell::CanAcceptEvent(const ui::Event& event) {
1140   return true;
1141 }
1142
1143 ui::EventTarget* Shell::GetParentTarget() {
1144   return aura::Env::GetInstance();
1145 }
1146
1147 scoped_ptr<ui::EventTargetIterator> Shell::GetChildIterator() const {
1148   return scoped_ptr<ui::EventTargetIterator>();
1149 }
1150
1151 ui::EventTargeter* Shell::GetEventTargeter() {
1152   NOTREACHED();
1153   return NULL;
1154 }
1155
1156 void Shell::OnEvent(ui::Event* event) {
1157 }
1158
1159 ////////////////////////////////////////////////////////////////////////////////
1160 // Shell, aura::client::ActivationChangeObserver implementation:
1161
1162 void Shell::OnWindowActivated(aura::Window* gained_active,
1163                               aura::Window* lost_active) {
1164   if (gained_active)
1165     target_root_window_ = gained_active->GetRootWindow();
1166 }
1167
1168 }  // namespace ash