src/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_filter.h"
  12 #include "ash/accelerators/focus_manager_factory.h"
  13 #include "ash/accelerators/nested_dispatcher_controller.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/window_tree_host_factory.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_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_window_ids.h"
  52 #include "ash/system/locale/locale_notification_controller.h"
  53 #include "ash/system/status_area_widget.h"
  54 #include "ash/system/tray/system_tray_delegate.h"
  55 #include "ash/system/tray/system_tray_notifier.h"
  56 #include "ash/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/user_activity_detector.h"
  76 #include "ash/wm/video_detector.h"
  77 #include "ash/wm/window_animations.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/debug/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/compositor/layer.h"
  91 #include "ui/compositor/layer_animator.h"
  92 #include "ui/events/event_target_iterator.h"
  93 #include "ui/gfx/display.h"
  94 #include "ui/gfx/image/image_skia.h"
  95 #include "ui/gfx/screen.h"
  96 #include "ui/gfx/size.h"
  97 #include "ui/keyboard/keyboard.h"
  98 #include "ui/keyboard/keyboard_controller.h"
  99 #include "ui/keyboard/keyboard_switches.h"
 100 #include "ui/keyboard/keyboard_util.h"
 101 #include "ui/message_center/message_center.h"
 102 #include "ui/views/corewm/tooltip_aura.h"
 103 #include "ui/views/corewm/tooltip_controller.h"
 104 #include "ui/views/focus/focus_manager_factory.h"
 105 #include "ui/views/widget/native_widget_aura.h"
 106 #include "ui/views/widget/widget.h"
 107 #include "ui/wm/core/compound_event_filter.h"
 108 #include "ui/wm/core/focus_controller.h"
 109 #include "ui/wm/core/input_method_event_filter.h"
 110 #include "ui/wm/core/shadow_controller.h"
 111 #include "ui/wm/core/visibility_controller.h"
 112 #include "ui/wm/core/window_modality_controller.h"
 113
 114 #if defined(OS_CHROMEOS)
 115 #if defined(USE_X11)
 116 #include "ash/accelerators/magnifier_key_scroller.h"
 117 #include "ash/accelerators/spoken_feedback_toggler.h"
 118 #include "ash/ash_constants.h"
 119 #include "ash/display/display_change_observer_chromeos.h"
 120 #include "ash/display/display_error_observer_chromeos.h"
 121 #include "ash/display/output_configurator_animation.h"
 122 #include "ash/display/projecting_observer_chromeos.h"
 123 #include "ash/system/chromeos/session/last_window_closed_logout_reminder.h"
 124 #include "base/message_loop/message_pump_x11.h"
 125 #include "base/sys_info.h"
 126 #include "ui/display/chromeos/output_configurator.h"
 127 #endif  // defined(USE_X11)
 128 #include "ash/display/resolution_notification_controller.h"
 129 #include "ash/sticky_keys/sticky_keys_controller.h"
 130 #include "ash/system/chromeos/bluetooth/bluetooth_notification_controller.h"
 131 #include "ash/system/chromeos/brightness/brightness_controller_chromeos.h"
 132 #include "ash/system/chromeos/power/power_event_observer.h"
 133 #include "ash/system/chromeos/power/power_status.h"
 134 #include "ash/system/chromeos/power/user_activity_notifier.h"
 135 #include "ash/system/chromeos/power/video_activity_notifier.h"
 136 #include "ash/system/chromeos/session/logout_confirmation_controller.h"
 137 #include "base/bind_helpers.h"
 138 #endif  // defined(OS_CHROMEOS)
 139
 140 namespace ash {
 141
 142 namespace {
 143
 144 using aura::Window;
 145 using views::Widget;
 146
 147 // A Corewm VisibilityController subclass that calls the Ash animation routine
 148 // so we can pick up our extended animations. See ash/wm/window_animations.h.
 149 class AshVisibilityController : public ::wm::VisibilityController {
 150  public:
 151   AshVisibilityController() {}
 152   virtual ~AshVisibilityController() {}
 153
 154  private:
 155   // Overridden from ::wm::VisibilityController:
 156   virtual bool CallAnimateOnChildWindowVisibilityChanged(
 157       aura::Window* window,
 158       bool visible) OVERRIDE {
 159     return AnimateOnChildWindowVisibilityChanged(window, visible);
 160   }
 161
 162   DISALLOW_COPY_AND_ASSIGN(AshVisibilityController);
 163 };
 164
 165 }  // namespace
 166
 167 // static
 168 Shell* Shell::instance_ = NULL;
 169 // static
 170 bool Shell::initially_hide_cursor_ = false;
 171
 172 ////////////////////////////////////////////////////////////////////////////////
 173 // Shell, public:
 174
 175 // static
 176 Shell* Shell::CreateInstance(ShellDelegate* delegate) {
 177   CHECK(!instance_);
 178   instance_ = new Shell(delegate);
 179   instance_->Init();
 180   return instance_;
 181 }
 182
 183 // static
 184 Shell* Shell::GetInstance() {
 185   DCHECK(instance_);
 186   return instance_;
 187 }
 188
 189 // static
 190 bool Shell::HasInstance() {
 191   return !!instance_;
 192 }
 193
 194 // static
 195 void Shell::DeleteInstance() {
 196   delete instance_;
 197   instance_ = NULL;
 198 }
 199
 200 // static
 201 internal::RootWindowController* Shell::GetPrimaryRootWindowController() {
 202   return internal::GetRootWindowController(GetPrimaryRootWindow());
 203 }
 204
 205 // static
 206 Shell::RootWindowControllerList Shell::GetAllRootWindowControllers() {
 207   return Shell::GetInstance()->display_controller()->
 208       GetAllRootWindowControllers();
 209 }
 210
 211 // static
 212 aura::Window* Shell::GetPrimaryRootWindow() {
 213   return GetInstance()->display_controller()->GetPrimaryRootWindow();
 214 }
 215
 216 // static
 217 aura::Window* Shell::GetTargetRootWindow() {
 218   Shell* shell = GetInstance();
 219   if (shell->scoped_target_root_window_)
 220     return shell->scoped_target_root_window_;
 221   return shell->target_root_window_;
 222 }
 223
 224 // static
 225 gfx::Screen* Shell::GetScreen() {
 226   return gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_ALTERNATE);
 227 }
 228
 229 // static
 230 aura::Window::Windows Shell::GetAllRootWindows() {
 231   return Shell::GetInstance()->display_controller()->
 232       GetAllRootWindows();
 233 }
 234
 235 // static
 236 aura::Window* Shell::GetContainer(aura::Window* root_window,
 237                                   int container_id) {
 238   return root_window->GetChildById(container_id);
 239 }
 240
 241 // static
 242 const aura::Window* Shell::GetContainer(const aura::Window* root_window,
 243                                         int container_id) {
 244   return root_window->GetChildById(container_id);
 245 }
 246
 247 // static
 248 std::vector<aura::Window*> Shell::GetContainersFromAllRootWindows(
 249     int container_id,
 250     aura::Window* priority_root) {
 251   std::vector<aura::Window*> containers;
 252   aura::Window::Windows root_windows = GetAllRootWindows();
 253   for (aura::Window::Windows::const_iterator it = root_windows.begin();
 254        it != root_windows.end(); ++it) {
 255     aura::Window* container = (*it)->GetChildById(container_id);
 256     if (container) {
 257       if (priority_root && priority_root->Contains(container))
 258         containers.insert(containers.begin(), container);
 259       else
 260         containers.push_back(container);
 261     }
 262   }
 263   return containers;
 264 }
 265
 266 void Shell::ShowContextMenu(const gfx::Point& location_in_screen,
 267                             ui::MenuSourceType source_type) {
 268   // No context menus if there is no session with an active user.
 269   if (!session_state_delegate_->NumberOfLoggedInUsers())
 270     return;
 271   // No context menus when screen is locked.
 272   if (session_state_delegate_->IsScreenLocked())
 273     return;
 274
 275   aura::Window* root =
 276       wm::GetRootWindowMatching(gfx::Rect(location_in_screen, gfx::Size()));
 277   internal::GetRootWindowController(root)->
 278       ShowContextMenu(location_in_screen, source_type);
 279 }
 280
 281 void Shell::ToggleAppList(aura::Window* window) {
 282   // If the context window is not given, show it on the target root window.
 283   if (!window)
 284     window = GetTargetRootWindow();
 285   if (!app_list_controller_)
 286     app_list_controller_.reset(new internal::AppListController);
 287   app_list_controller_->SetVisible(!app_list_controller_->IsVisible(), window);
 288 }
 289
 290 bool Shell::GetAppListTargetVisibility() const {
 291   return app_list_controller_.get() &&
 292       app_list_controller_->GetTargetVisibility();
 293 }
 294
 295 aura::Window* Shell::GetAppListWindow() {
 296   return app_list_controller_.get() ? app_list_controller_->GetWindow() : NULL;
 297 }
 298
 299 app_list::AppListView* Shell::GetAppListView() {
 300   return app_list_controller_.get() ? app_list_controller_->GetView() : NULL;
 301 }
 302
 303 bool Shell::IsSystemModalWindowOpen() const {
 304   if (simulate_modal_window_open_for_testing_)
 305     return true;
 306   const std::vector<aura::Window*> containers = GetContainersFromAllRootWindows(
 307       internal::kShellWindowId_SystemModalContainer, NULL);
 308   for (std::vector<aura::Window*>::const_iterator cit = containers.begin();
 309        cit != containers.end(); ++cit) {
 310     for (aura::Window::Windows::const_iterator wit = (*cit)->children().begin();
 311          wit != (*cit)->children().end(); ++wit) {
 312       if ((*wit)->GetProperty(aura::client::kModalKey) ==
 313           ui::MODAL_TYPE_SYSTEM && (*wit)->TargetVisibility()) {
 314         return true;
 315       }
 316     }
 317   }
 318   return false;
 319 }
 320
 321 views::NonClientFrameView* Shell::CreateDefaultNonClientFrameView(
 322     views::Widget* widget) {
 323   // Use translucent-style window frames for dialogs.
 324   return new CustomFrameViewAsh(widget);
 325 }
 326
 327 void Shell::RotateFocus(Direction direction) {
 328   focus_cycler_->RotateFocus(
 329       direction == FORWARD ? internal::FocusCycler::FORWARD :
 330                              internal::FocusCycler::BACKWARD);
 331 }
 332
 333 void Shell::SetDisplayWorkAreaInsets(Window* contains,
 334                                      const gfx::Insets& insets) {
 335   if (!display_controller_->UpdateWorkAreaOfDisplayNearestWindow(
 336           contains, insets)) {
 337     return;
 338   }
 339   FOR_EACH_OBSERVER(ShellObserver, observers_,
 340                     OnDisplayWorkAreaInsetsChanged());
 341 }
 342
 343 void Shell::OnLoginStateChanged(user::LoginStatus status) {
 344   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLoginStateChanged(status));
 345 }
 346
 347 void Shell::OnLoginUserProfilePrepared() {
 348   CreateShelf();
 349   CreateKeyboard();
 350 }
 351
 352 void Shell::UpdateAfterLoginStatusChange(user::LoginStatus status) {
 353   RootWindowControllerList controllers = GetAllRootWindowControllers();
 354   for (RootWindowControllerList::iterator iter = controllers.begin();
 355        iter != controllers.end(); ++iter)
 356     (*iter)->UpdateAfterLoginStatusChange(status);
 357 }
 358
 359 void Shell::OnAppTerminating() {
 360   FOR_EACH_OBSERVER(ShellObserver, observers_, OnAppTerminating());
 361 }
 362
 363 void Shell::OnLockStateChanged(bool locked) {
 364   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLockStateChanged(locked));
 365 #ifndef NDEBUG
 366   // Make sure that there is no system modal in Lock layer when unlocked.
 367   if (!locked) {
 368     std::vector<aura::Window*> containers = GetContainersFromAllRootWindows(
 369         internal::kShellWindowId_LockSystemModalContainer,
 370         GetPrimaryRootWindow());
 371     for (std::vector<aura::Window*>::const_iterator iter = containers.begin();
 372          iter != containers.end(); ++iter) {
 373       DCHECK_EQ(0u, (*iter)->children().size());
 374     }
 375   }
 376 #endif
 377 }
 378
 379 void Shell::OnCastingSessionStartedOrStopped(bool started) {
 380 #if defined(OS_CHROMEOS) && defined(USE_X11)
 381   if (projecting_observer_)
 382     projecting_observer_->OnCastingSessionStartedOrStopped(started);
 383 #endif
 384 }
 385
 386 void Shell::OnOverviewModeStarting() {
 387   FOR_EACH_OBSERVER(ShellObserver, observers_, OnOverviewModeStarting());
 388 }
 389
 390 void Shell::OnOverviewModeEnding() {
 391   FOR_EACH_OBSERVER(ShellObserver, observers_, OnOverviewModeEnding());
 392 }
 393
 394 void Shell::OnMaximizeModeStarted() {
 395   FOR_EACH_OBSERVER(ShellObserver, observers_, OnMaximizeModeStarted());
 396 }
 397
 398 void Shell::OnMaximizeModeEnded() {
 399   FOR_EACH_OBSERVER(ShellObserver, observers_, OnMaximizeModeEnded());
 400 }
 401
 402 void Shell::CreateShelf() {
 403   RootWindowControllerList controllers = GetAllRootWindowControllers();
 404   for (RootWindowControllerList::iterator iter = controllers.begin();
 405        iter != controllers.end(); ++iter)
 406     (*iter)->shelf()->CreateShelf();
 407 }
 408
 409 void Shell::CreateKeyboard() {
 410   // TODO(bshe): Primary root window controller may not be the controller to
 411   // attach virtual keyboard. See http://crbug.com/303429
 412   InitKeyboard();
 413   if (keyboard::IsKeyboardUsabilityExperimentEnabled()) {
 414     display_controller()->virtual_keyboard_window_controller()->
 415         ActivateKeyboard(keyboard_controller_.get());
 416   } else {
 417     GetPrimaryRootWindowController()->
 418         ActivateKeyboard(keyboard_controller_.get());
 419   }
 420 }
 421
 422 void Shell::DeactivateKeyboard() {
 423   if (keyboard_controller_.get()) {
 424     RootWindowControllerList controllers = GetAllRootWindowControllers();
 425     for (RootWindowControllerList::iterator iter = controllers.begin();
 426         iter != controllers.end(); ++iter) {
 427       (*iter)->DeactivateKeyboard(keyboard_controller_.get());
 428     }
 429   }
 430   keyboard_controller_.reset();
 431 }
 432
 433 void Shell::ShowShelf() {
 434   RootWindowControllerList controllers = GetAllRootWindowControllers();
 435   for (RootWindowControllerList::iterator iter = controllers.begin();
 436        iter != controllers.end(); ++iter)
 437     (*iter)->ShowShelf();
 438 }
 439
 440 void Shell::AddShellObserver(ShellObserver* observer) {
 441   observers_.AddObserver(observer);
 442 }
 443
 444 void Shell::RemoveShellObserver(ShellObserver* observer) {
 445   observers_.RemoveObserver(observer);
 446 }
 447
 448 void Shell::EnableMaximizeModeWindowManager(bool enable) {
 449   if (enable && !maximize_mode_window_manager_.get()) {
 450     maximize_mode_window_manager_.reset(
 451         new internal::MaximizeModeWindowManager());
 452   } else if (!enable && maximize_mode_window_manager_.get()) {
 453     maximize_mode_window_manager_.reset();
 454   }
 455 }
 456
 457 bool Shell::IsMaximizeModeWindowManagerEnabled() {
 458   return maximize_mode_window_manager_.get() != NULL;
 459 }
 460
 461 void Shell::UpdateShelfVisibility() {
 462   RootWindowControllerList controllers = GetAllRootWindowControllers();
 463   for (RootWindowControllerList::iterator iter = controllers.begin();
 464        iter != controllers.end(); ++iter)
 465     if ((*iter)->shelf())
 466       (*iter)->UpdateShelfVisibility();
 467 }
 468
 469 void Shell::SetShelfAutoHideBehavior(ShelfAutoHideBehavior behavior,
 470                                      aura::Window* root_window) {
 471   ash::internal::ShelfLayoutManager::ForShelf(root_window)->
 472       SetAutoHideBehavior(behavior);
 473 }
 474
 475 ShelfAutoHideBehavior Shell::GetShelfAutoHideBehavior(
 476     aura::Window* root_window) const {
 477   return ash::internal::ShelfLayoutManager::ForShelf(root_window)->
 478       auto_hide_behavior();
 479 }
 480
 481 void Shell::SetShelfAlignment(ShelfAlignment alignment,
 482                               aura::Window* root_window) {
 483   if (ash::internal::ShelfLayoutManager::ForShelf(root_window)->
 484       SetAlignment(alignment)) {
 485     FOR_EACH_OBSERVER(
 486         ShellObserver, observers_, OnShelfAlignmentChanged(root_window));
 487   }
 488 }
 489
 490 ShelfAlignment Shell::GetShelfAlignment(aura::Window* root_window) {
 491   return internal::GetRootWindowController(root_window)->
 492       GetShelfLayoutManager()->GetAlignment();
 493 }
 494
 495 void Shell::SetDimming(bool should_dim) {
 496   RootWindowControllerList controllers = GetAllRootWindowControllers();
 497   for (RootWindowControllerList::iterator iter = controllers.begin();
 498        iter != controllers.end(); ++iter)
 499     (*iter)->screen_dimmer()->SetDimming(should_dim);
 500 }
 501
 502 void Shell::NotifyFullscreenStateChange(bool is_fullscreen,
 503                                         aura::Window* root_window) {
 504   FOR_EACH_OBSERVER(ShellObserver, observers_, OnFullscreenStateChanged(
 505       is_fullscreen, root_window));
 506 }
 507
 508 void Shell::CreateModalBackground(aura::Window* window) {
 509   if (!modality_filter_) {
 510     modality_filter_.reset(new internal::SystemModalContainerEventFilter(this));
 511     AddPreTargetHandler(modality_filter_.get());
 512   }
 513   RootWindowControllerList controllers = GetAllRootWindowControllers();
 514   for (RootWindowControllerList::iterator iter = controllers.begin();
 515        iter != controllers.end(); ++iter)
 516     (*iter)->GetSystemModalLayoutManager(window)->CreateModalBackground();
 517 }
 518
 519 void Shell::OnModalWindowRemoved(aura::Window* removed) {
 520   RootWindowControllerList controllers = GetAllRootWindowControllers();
 521   bool activated = false;
 522   for (RootWindowControllerList::iterator iter = controllers.begin();
 523        iter != controllers.end() && !activated; ++iter) {
 524     activated = (*iter)->GetSystemModalLayoutManager(removed)->
 525         ActivateNextModalWindow();
 526   }
 527   if (!activated) {
 528     RemovePreTargetHandler(modality_filter_.get());
 529     modality_filter_.reset();
 530     for (RootWindowControllerList::iterator iter = controllers.begin();
 531          iter != controllers.end(); ++iter)
 532       (*iter)->GetSystemModalLayoutManager(removed)->DestroyModalBackground();
 533   }
 534 }
 535
 536 WebNotificationTray* Shell::GetWebNotificationTray() {
 537   return GetPrimaryRootWindowController()->shelf()->
 538       status_area_widget()->web_notification_tray();
 539 }
 540
 541 bool Shell::HasPrimaryStatusArea() {
 542   ShelfWidget* shelf = GetPrimaryRootWindowController()->shelf();
 543   return shelf && shelf->status_area_widget();
 544 }
 545
 546 SystemTray* Shell::GetPrimarySystemTray() {
 547   return GetPrimaryRootWindowController()->GetSystemTray();
 548 }
 549
 550 ShelfDelegate* Shell::GetShelfDelegate() {
 551   if (!shelf_delegate_) {
 552     shelf_model_.reset(new ShelfModel);
 553     // Creates ShelfItemDelegateManager before ShelfDelegate.
 554     shelf_item_delegate_manager_.reset(
 555         new ShelfItemDelegateManager(shelf_model_.get()));
 556
 557     shelf_delegate_.reset(delegate_->CreateShelfDelegate(shelf_model_.get()));
 558     scoped_ptr<ShelfItemDelegate> controller(
 559         new internal::AppListShelfItemDelegate);
 560
 561     // Finding the shelf model's location of the app list and setting its
 562     // ShelfItemDelegate.
 563     int app_list_index = shelf_model_->GetItemIndexForType(TYPE_APP_LIST);
 564     DCHECK_GE(app_list_index, 0);
 565     ShelfID app_list_id = shelf_model_->items()[app_list_index].id;
 566     DCHECK(app_list_id);
 567     shelf_item_delegate_manager_->SetShelfItemDelegate(app_list_id,
 568                                                        controller.Pass());
 569     shelf_window_watcher_.reset(new internal::ShelfWindowWatcher(
 570                                         shelf_model_.get(),
 571                                         shelf_item_delegate_manager_.get()));
 572   }
 573   return shelf_delegate_.get();
 574 }
 575
 576 void Shell::SetTouchHudProjectionEnabled(bool enabled) {
 577   if (is_touch_hud_projection_enabled_ == enabled)
 578     return;
 579
 580   is_touch_hud_projection_enabled_ = enabled;
 581   FOR_EACH_OBSERVER(ShellObserver, observers_,
 582                     OnTouchHudProjectionToggled(enabled));
 583 }
 584
 585 #if defined(OS_CHROMEOS)
 586 ash::FirstRunHelper* Shell::CreateFirstRunHelper() {
 587   return new ash::FirstRunHelperImpl;
 588 }
 589
 590 void Shell::SetCursorCompositingEnabled(bool enabled) {
 591   display_controller_->cursor_window_controller()->SetCursorCompositingEnabled(
 592       enabled);
 593   native_cursor_manager_->SetNativeCursorEnabled(!enabled);
 594 }
 595 #endif  // defined(OS_CHROMEOS)
 596
 597 void Shell::DoInitialWorkspaceAnimation() {
 598   return GetPrimaryRootWindowController()->workspace_controller()->
 599       DoInitialAnimation();
 600 }
 601
 602 ////////////////////////////////////////////////////////////////////////////////
 603 // Shell, private:
 604
 605 Shell::Shell(ShellDelegate* delegate)
 606     : target_root_window_(NULL),
 607       scoped_target_root_window_(NULL),
 608       delegate_(delegate),
 609       window_positioner_(new WindowPositioner),
 610       activation_client_(NULL),
 611       accelerometer_controller_(new AccelerometerController()),
 612 #if defined(OS_CHROMEOS) && defined(USE_X11)
 613       output_configurator_(new ui::OutputConfigurator()),
 614 #endif  // defined(OS_CHROMEOS) && defined(USE_X11)
 615       native_cursor_manager_(new AshNativeCursorManager),
 616       cursor_manager_(scoped_ptr< ::wm::NativeCursorManager>(
 617           native_cursor_manager_)),
 618       simulate_modal_window_open_for_testing_(false),
 619       is_touch_hud_projection_enabled_(false) {
 620   DCHECK(delegate_.get());
 621   gpu_support_.reset(delegate_->CreateGPUSupport());
 622   display_manager_.reset(new internal::DisplayManager);
 623   display_controller_.reset(new DisplayController);
 624 #if defined(OS_CHROMEOS) && defined(USE_X11)
 625   user_metrics_recorder_.reset(new UserMetricsRecorder);
 626 #endif  // defined(OS_CHROMEOS)
 627
 628 #if defined(OS_CHROMEOS)
 629   internal::PowerStatus::Initialize();
 630 #endif
 631 }
 632
 633 Shell::~Shell() {
 634   TRACE_EVENT0("shutdown", "ash::Shell::Destructor");
 635
 636   delegate_->PreShutdown();
 637
 638   views::FocusManagerFactory::Install(NULL);
 639
 640   // Remove the focus from any window. This will prevent overhead and side
 641   // effects (e.g. crashes) from changing focus during shutdown.
 642   // See bug crbug.com/134502.
 643   aura::client::GetFocusClient(GetPrimaryRootWindow())->FocusWindow(NULL);
 644
 645   // Please keep in same order as in Init() because it's easy to miss one.
 646   if (window_modality_controller_)
 647     window_modality_controller_.reset();
 648 #if defined(OS_CHROMEOS) && defined(USE_X11)
 649   RemovePreTargetHandler(magnifier_key_scroll_handler_.get());
 650   magnifier_key_scroll_handler_.reset();
 651
 652   RemovePreTargetHandler(speech_feedback_handler_.get());
 653   speech_feedback_handler_.reset();
 654 #endif
 655   RemovePreTargetHandler(user_activity_detector_.get());
 656   RemovePreTargetHandler(overlay_filter_.get());
 657   RemovePreTargetHandler(input_method_filter_.get());
 658   RemovePreTargetHandler(accelerator_filter_.get());
 659   RemovePreTargetHandler(event_transformation_handler_.get());
 660   RemovePreTargetHandler(toplevel_window_event_handler_.get());
 661   RemovePostTargetHandler(toplevel_window_event_handler_.get());
 662   RemovePreTargetHandler(system_gesture_filter_.get());
 663   RemovePreTargetHandler(keyboard_metrics_filter_.get());
 664   if (mouse_cursor_filter_)
 665     RemovePreTargetHandler(mouse_cursor_filter_.get());
 666
 667   // TooltipController is deleted with the Shell so removing its references.
 668   RemovePreTargetHandler(tooltip_controller_.get());
 669
 670   // Destroy maximize window manager early on since it has some observers which
 671   // need to be removed.
 672   maximize_mode_controller_.reset();
 673   maximize_mode_window_manager_.reset();
 674
 675   // AppList needs to be released before shelf layout manager, which is
 676   // destroyed with shelf container in the loop below. However, app list
 677   // container is now on top of shelf container and released after it.
 678   // TODO(xiyuan): Move it back when app list container is no longer needed.
 679   app_list_controller_.reset();
 680
 681 #if defined(OS_CHROMEOS)
 682   // Destroy the LastWindowClosedLogoutReminder before the
 683   // LogoutConfirmationController.
 684   last_window_closed_logout_reminder_.reset();
 685
 686   // Destroy the LogoutConfirmationController before the SystemTrayDelegate.
 687   logout_confirmation_controller_.reset();
 688 #endif
 689
 690   // Destroy SystemTrayDelegate before destroying the status area(s).
 691   system_tray_delegate_->Shutdown();
 692   system_tray_delegate_.reset();
 693
 694   locale_notification_controller_.reset();
 695
 696   // Drag-and-drop must be canceled prior to close all windows.
 697   drag_drop_controller_.reset();
 698
 699   // Controllers who have WindowObserver added must be deleted
 700   // before |display_controller_| is deleted.
 701
 702 #if defined(OS_CHROMEOS)
 703   // VideoActivityNotifier must be deleted before |video_detector_| is
 704   // deleted because it's observing video activity through
 705   // VideoDetectorObserver interface.
 706   video_activity_notifier_.reset();
 707 #endif  // defined(OS_CHROMEOS)
 708   video_detector_.reset();
 709
 710   shadow_controller_.reset();
 711   resize_shadow_controller_.reset();
 712
 713   window_selector_controller_.reset();
 714   mru_window_tracker_.reset();
 715
 716   // |shelf_window_watcher_| has a weak pointer to |shelf_Model_|
 717   // and has window observers.
 718   shelf_window_watcher_.reset();
 719
 720   // Destroy all child windows including widgets.
 721   display_controller_->CloseChildWindows();
 722   display_controller_->CloseNonDesktopDisplay();
 723
 724   // Chrome implementation of shelf delegate depends on FocusClient,
 725   // so must be deleted before |focus_client_|.
 726   shelf_delegate_.reset();
 727   focus_client_.reset();
 728
 729   // Destroy SystemTrayNotifier after destroying SystemTray as TrayItems
 730   // needs to remove observers from it.
 731   system_tray_notifier_.reset();
 732
 733   // These need a valid Shell instance to clean up properly, so explicitly
 734   // delete them before invalidating the instance.
 735   // Alphabetical. TODO(oshima): sort.
 736   magnification_controller_.reset();
 737   partial_magnification_controller_.reset();
 738   tooltip_controller_.reset();
 739   event_client_.reset();
 740   nested_dispatcher_controller_.reset();
 741   toplevel_window_event_handler_.reset();
 742   visibility_controller_.reset();
 743   // |shelf_item_delegate_manager_| observes |shelf_model_|. It must be
 744   // destroyed before |shelf_model_| is destroyed.
 745   shelf_item_delegate_manager_.reset();
 746   shelf_model_.reset();
 747
 748   power_button_controller_.reset();
 749   lock_state_controller_.reset();
 750
 751 #if defined(OS_CHROMEOS)
 752   resolution_notification_controller_.reset();
 753 #endif
 754   desktop_background_controller_.reset();
 755
 756   // This also deletes all RootWindows. Note that we invoke Shutdown() on
 757   // DisplayController before resetting |display_controller_|, since destruction
 758   // of its owned RootWindowControllers relies on the value.
 759   display_manager_->CreateScreenForShutdown();
 760   display_controller_->Shutdown();
 761   display_controller_.reset();
 762   screen_position_controller_.reset();
 763
 764   keyboard_controller_.reset();
 765   accessibility_delegate_.reset();
 766   new_window_delegate_.reset();
 767   media_delegate_.reset();
 768
 769 #if defined(OS_CHROMEOS) && defined(USE_X11)
 770   if (display_change_observer_)
 771     output_configurator_->RemoveObserver(display_change_observer_.get());
 772   if (output_configurator_animation_)
 773     output_configurator_->RemoveObserver(output_configurator_animation_.get());
 774   if (display_error_observer_)
 775     output_configurator_->RemoveObserver(display_error_observer_.get());
 776   if (projecting_observer_)
 777     output_configurator_->RemoveObserver(projecting_observer_.get());
 778   display_change_observer_.reset();
 779 #endif  // defined(OS_CHROMEOS)
 780
 781 #if defined(OS_CHROMEOS)
 782   internal::PowerStatus::Shutdown();
 783 #endif
 784
 785   DCHECK(instance_ == this);
 786   instance_ = NULL;
 787 }
 788
 789 void Shell::Init() {
 790   delegate_->PreInit();
 791   if (keyboard::IsKeyboardUsabilityExperimentEnabled()) {
 792     display_manager_->SetSecondDisplayMode(
 793         internal::DisplayManager::VIRTUAL_KEYBOARD);
 794   }
 795   bool display_initialized = display_manager_->InitFromCommandLine();
 796 #if defined(OS_CHROMEOS) && defined(USE_X11)
 797   output_configurator_->Init(!gpu_support_->IsPanelFittingDisabled());
 798   output_configurator_animation_.reset(
 799       new internal::OutputConfiguratorAnimation());
 800   output_configurator_->AddObserver(output_configurator_animation_.get());
 801
 802   projecting_observer_.reset(new internal::ProjectingObserver());
 803   output_configurator_->AddObserver(projecting_observer_.get());
 804
 805   if (!display_initialized && base::SysInfo::IsRunningOnChromeOS()) {
 806     display_change_observer_.reset(new internal::DisplayChangeObserver);
 807     // Register |display_change_observer_| first so that the rest of
 808     // observer gets invoked after the root windows are configured.
 809     output_configurator_->AddObserver(display_change_observer_.get());
 810     display_error_observer_.reset(new internal::DisplayErrorObserver());
 811     output_configurator_->AddObserver(display_error_observer_.get());
 812     output_configurator_->set_state_controller(display_change_observer_.get());
 813     output_configurator_->set_mirroring_controller(display_manager_.get());
 814     output_configurator_->ForceInitialConfigure(
 815         delegate_->IsFirstRunAfterBoot() ? kChromeOsBootColor : 0);
 816     display_initialized = true;
 817   }
 818 #endif  // defined(OS_CHROMEOS) && defined(USE_X11)
 819   if (!display_initialized)
 820     display_manager_->InitDefaultDisplay();
 821
 822   // Install the custom factory first so that views::FocusManagers for Tray,
 823   // Shelf, and WallPaper could be created by the factory.
 824   views::FocusManagerFactory::Install(new AshFocusManagerFactory);
 825
 826   // Env creates the compositor. Historically it seems to have been implicitly
 827   // initialized first by the ActivationController, but now that FocusController
 828   // no longer does this we need to do it explicitly.
 829   aura::Env::CreateInstance();
 830
 831   // The WindowModalityController needs to be at the front of the input event
 832   // pretarget handler list to ensure that it processes input events when modal
 833   // windows are active.
 834   window_modality_controller_.reset(
 835       new ::wm::WindowModalityController(this));
 836
 837   AddPreTargetHandler(this);
 838
 839   env_filter_.reset(new ::wm::CompoundEventFilter);
 840   AddPreTargetHandler(env_filter_.get());
 841
 842   ::wm::FocusController* focus_controller =
 843       new ::wm::FocusController(new wm::AshFocusRules);
 844   focus_client_.reset(focus_controller);
 845   activation_client_ = focus_controller;
 846   activation_client_->AddObserver(this);
 847   focus_cycler_.reset(new internal::FocusCycler());
 848
 849   screen_position_controller_.reset(new internal::ScreenPositionController);
 850   window_tree_host_factory_.reset(delegate_->CreateWindowTreeHostFactory());
 851
 852   display_controller_->Start();
 853   display_controller_->InitPrimaryDisplay();
 854   aura::Window* root_window = display_controller_->GetPrimaryRootWindow();
 855   target_root_window_ = root_window;
 856
 857 #if defined(OS_CHROMEOS)
 858   resolution_notification_controller_.reset(
 859       new internal::ResolutionNotificationController);
 860 #endif
 861
 862   cursor_manager_.SetDisplay(GetScreen()->GetPrimaryDisplay());
 863
 864   nested_dispatcher_controller_.reset(new NestedDispatcherController);
 865   accelerator_controller_.reset(new AcceleratorController);
 866   maximize_mode_controller_.reset(new MaximizeModeController());
 867
 868 #if defined(OS_CHROMEOS) && defined(USE_X11)
 869   magnifier_key_scroll_handler_ = MagnifierKeyScroller::CreateHandler().Pass();
 870   AddPreTargetHandler(magnifier_key_scroll_handler_.get());
 871   speech_feedback_handler_ = SpokenFeedbackToggler::CreateHandler().Pass();
 872   AddPreTargetHandler(speech_feedback_handler_.get());
 873 #endif
 874
 875   // The order in which event filters are added is significant.
 876
 877 #if defined(OS_CHROMEOS)
 878   // The StickyKeysController also rewrites events and must be added
 879   // before observers, but after the EventRewriterEventFilter.
 880   sticky_keys_controller_.reset(new StickyKeysController);
 881   AddPreTargetHandler(sticky_keys_controller_.get());
 882 #endif
 883
 884   // UserActivityDetector passes events to observers, so let them get
 885   // rewritten first.
 886   user_activity_detector_.reset(new UserActivityDetector);
 887   AddPreTargetHandler(user_activity_detector_.get());
 888
 889   overlay_filter_.reset(new internal::OverlayEventFilter);
 890   AddPreTargetHandler(overlay_filter_.get());
 891   AddShellObserver(overlay_filter_.get());
 892
 893   input_method_filter_.reset(new ::wm::InputMethodEventFilter(
 894       root_window->GetHost()->GetAcceleratedWidget()));
 895   AddPreTargetHandler(input_method_filter_.get());
 896
 897   accelerator_filter_.reset(new internal::AcceleratorFilter);
 898   AddPreTargetHandler(accelerator_filter_.get());
 899
 900   event_transformation_handler_.reset(new internal::EventTransformationHandler);
 901   AddPreTargetHandler(event_transformation_handler_.get());
 902
 903   toplevel_window_event_handler_.reset(new ToplevelWindowEventHandler);
 904
 905   system_gesture_filter_.reset(new internal::SystemGestureEventFilter);
 906   AddPreTargetHandler(system_gesture_filter_.get());
 907
 908   keyboard_metrics_filter_.reset(new internal::KeyboardUMAEventFilter);
 909   AddPreTargetHandler(keyboard_metrics_filter_.get());
 910
 911   // The keyboard system must be initialized before the RootWindowController is
 912   // created.
 913 #if defined(OS_CHROMEOS)
 914     keyboard::InitializeKeyboard();
 915 #endif
 916
 917   lock_state_controller_.reset(new LockStateController);
 918   power_button_controller_.reset(new PowerButtonController(
 919       lock_state_controller_.get()));
 920 #if defined(OS_CHROMEOS) && defined(USE_X11)
 921   // Pass the initial display state to PowerButtonController.
 922   power_button_controller_->OnDisplayModeChanged(
 923       output_configurator_->cached_outputs());
 924 #endif
 925   AddShellObserver(lock_state_controller_.get());
 926
 927   drag_drop_controller_.reset(new internal::DragDropController);
 928   mouse_cursor_filter_.reset(new internal::MouseCursorEventFilter());
 929   PrependPreTargetHandler(mouse_cursor_filter_.get());
 930
 931   // Create Controllers that may need root window.
 932   // TODO(oshima): Move as many controllers before creating
 933   // RootWindowController as possible.
 934   visibility_controller_.reset(new AshVisibilityController);
 935
 936   magnification_controller_.reset(
 937       MagnificationController::CreateInstance());
 938   mru_window_tracker_.reset(new MruWindowTracker(activation_client_));
 939
 940   partial_magnification_controller_.reset(
 941       new PartialMagnificationController());
 942
 943   autoclick_controller_.reset(AutoclickController::CreateInstance());
 944
 945   high_contrast_controller_.reset(new HighContrastController);
 946   video_detector_.reset(new VideoDetector);
 947   window_selector_controller_.reset(new WindowSelectorController());
 948
 949   tooltip_controller_.reset(
 950       new views::corewm::TooltipController(
 951           scoped_ptr<views::corewm::Tooltip>(
 952               new views::corewm::TooltipAura(gfx::SCREEN_TYPE_ALTERNATE))));
 953   AddPreTargetHandler(tooltip_controller_.get());
 954
 955   event_client_.reset(new internal::EventClientImpl);
 956
 957   // This controller needs to be set before SetupManagedWindowMode.
 958   desktop_background_controller_.reset(new DesktopBackgroundController());
 959   user_wallpaper_delegate_.reset(delegate_->CreateUserWallpaperDelegate());
 960
 961   session_state_delegate_.reset(delegate_->CreateSessionStateDelegate());
 962   accessibility_delegate_.reset(delegate_->CreateAccessibilityDelegate());
 963   new_window_delegate_.reset(delegate_->CreateNewWindowDelegate());
 964   media_delegate_.reset(delegate_->CreateMediaDelegate());
 965
 966   resize_shadow_controller_.reset(new internal::ResizeShadowController());
 967   shadow_controller_.reset(
 968       new ::wm::ShadowController(activation_client_));
 969
 970   // Create system_tray_notifier_ before the delegate.
 971   system_tray_notifier_.reset(new ash::SystemTrayNotifier());
 972
 973   // Initialize system_tray_delegate_ before initializing StatusAreaWidget.
 974   system_tray_delegate_.reset(delegate()->CreateSystemTrayDelegate());
 975   DCHECK(system_tray_delegate_.get());
 976
 977   locale_notification_controller_.reset(
 978       new internal::LocaleNotificationController);
 979
 980   // Initialize system_tray_delegate_ after StatusAreaWidget is created.
 981   system_tray_delegate_->Initialize();
 982
 983 #if defined(OS_CHROMEOS)
 984   // Create the LogoutConfirmationController after the SystemTrayDelegate.
 985   logout_confirmation_controller_.reset(
 986       new internal::LogoutConfirmationController(
 987           base::Bind(&SystemTrayDelegate::SignOut,
 988                      base::Unretained(system_tray_delegate_.get()))));
 989 #endif
 990
 991   // TODO(oshima): Initialize all RootWindowControllers once, and
 992   // initialize controller/delegates above when initializing the
 993   // primary root window controller.
 994   internal::RootWindowController::CreateForPrimaryDisplay(
 995       root_window->GetHost());
 996
 997   display_controller_->InitSecondaryDisplays();
 998
 999   // It needs to be created after RootWindowController has been created
1000   // (which calls OnWindowResized has been called, otherwise the
1001   // widget will not paint when restoring after a browser crash.  Also it needs
1002   // to be created after InitSecondaryDisplays() to initialize the wallpapers in
1003   // the correct size.
1004   user_wallpaper_delegate_->InitializeWallpaper();
1005
1006   if (initially_hide_cursor_)
1007     cursor_manager_.HideCursor();
1008   cursor_manager_.SetCursor(ui::kCursorPointer);
1009
1010 #if defined(OS_CHROMEOS)
1011   // Set accelerator controller delegates.
1012   accelerator_controller_->SetBrightnessControlDelegate(
1013       scoped_ptr<ash::BrightnessControlDelegate>(
1014           new ash::system::BrightnessControllerChromeos).Pass());
1015
1016   power_event_observer_.reset(new internal::PowerEventObserver());
1017   user_activity_notifier_.reset(
1018       new internal::UserActivityNotifier(user_activity_detector_.get()));
1019   video_activity_notifier_.reset(
1020       new internal::VideoActivityNotifier(video_detector_.get()));
1021   bluetooth_notification_controller_.reset(
1022       new internal::BluetoothNotificationController);
1023   last_window_closed_logout_reminder_.reset(
1024       new internal::LastWindowClosedLogoutReminder);
1025 #endif
1026
1027   weak_display_manager_factory_.reset(
1028       new base::WeakPtrFactory<internal::DisplayManager>(
1029           display_manager_.get()));
1030   // The compositor thread and main message loop have to be running in
1031   // order to create mirror window. Run it after the main message loop
1032   // is started.
1033   base::MessageLoopForUI::current()->PostTask(
1034       FROM_HERE,
1035       base::Bind(&internal::DisplayManager::CreateMirrorWindowIfAny,
1036                  weak_display_manager_factory_->GetWeakPtr()));
1037 }
1038
1039 void Shell::InitKeyboard() {
1040   if (keyboard::IsKeyboardEnabled()) {
1041     if (keyboard_controller_.get()) {
1042       RootWindowControllerList controllers = GetAllRootWindowControllers();
1043       for (RootWindowControllerList::iterator iter = controllers.begin();
1044            iter != controllers.end(); ++iter) {
1045         (*iter)->DeactivateKeyboard(keyboard_controller_.get());
1046       }
1047     }
1048     keyboard::KeyboardControllerProxy* proxy =
1049         delegate_->CreateKeyboardControllerProxy();
1050     keyboard_controller_.reset(
1051         new keyboard::KeyboardController(proxy));
1052   }
1053 }
1054
1055 void Shell::InitRootWindow(aura::Window* root_window) {
1056   DCHECK(activation_client_);
1057   DCHECK(visibility_controller_.get());
1058   DCHECK(drag_drop_controller_.get());
1059
1060   aura::client::SetFocusClient(root_window, focus_client_.get());
1061   input_method_filter_->SetInputMethodPropertyInRootWindow(root_window);
1062   aura::client::SetActivationClient(root_window, activation_client_);
1063   ::wm::FocusController* focus_controller =
1064       static_cast< ::wm::FocusController*>(activation_client_);
1065   root_window->AddPreTargetHandler(focus_controller);
1066   aura::client::SetVisibilityClient(root_window, visibility_controller_.get());
1067   aura::client::SetDragDropClient(root_window, drag_drop_controller_.get());
1068   aura::client::SetScreenPositionClient(root_window,
1069                                         screen_position_controller_.get());
1070   aura::client::SetCursorClient(root_window, &cursor_manager_);
1071   aura::client::SetTooltipClient(root_window, tooltip_controller_.get());
1072   aura::client::SetEventClient(root_window, event_client_.get());
1073
1074   aura::client::SetWindowMoveClient(root_window,
1075       toplevel_window_event_handler_.get());
1076   root_window->AddPreTargetHandler(toplevel_window_event_handler_.get());
1077   root_window->AddPostTargetHandler(toplevel_window_event_handler_.get());
1078
1079   if (nested_dispatcher_controller_) {
1080     aura::client::SetDispatcherClient(root_window,
1081                                       nested_dispatcher_controller_.get());
1082   }
1083 }
1084
1085 bool Shell::CanWindowReceiveEvents(aura::Window* window) {
1086   RootWindowControllerList controllers = GetAllRootWindowControllers();
1087   for (RootWindowControllerList::iterator iter = controllers.begin();
1088        iter != controllers.end(); ++iter) {
1089     internal::SystemModalContainerLayoutManager* layout_manager =
1090         (*iter)->GetSystemModalLayoutManager(window);
1091     if (layout_manager && layout_manager->CanWindowReceiveEvents(window))
1092       return true;
1093     // Allow events to fall through to the virtual keyboard even if displaying
1094     // a system modal dialog.
1095     if ((*iter)->IsVirtualKeyboardWindow(window))
1096       return true;
1097   }
1098
1099   return false;
1100 }
1101
1102 ////////////////////////////////////////////////////////////////////////////////
1103 // Shell, ui::EventTarget overrides:
1104
1105 bool Shell::CanAcceptEvent(const ui::Event& event) {
1106   return true;
1107 }
1108
1109 ui::EventTarget* Shell::GetParentTarget() {
1110   return aura::Env::GetInstance();
1111 }
1112
1113 scoped_ptr<ui::EventTargetIterator> Shell::GetChildIterator() const {
1114   return scoped_ptr<ui::EventTargetIterator>();
1115 }
1116
1117 ui::EventTargeter* Shell::GetEventTargeter() {
1118   NOTREACHED();
1119   return NULL;
1120 }
1121
1122 void Shell::OnEvent(ui::Event* event) {
1123 }
1124
1125 ////////////////////////////////////////////////////////////////////////////////
1126 // Shell, aura::client::ActivationChangeObserver implementation:
1127
1128 void Shell::OnWindowActivated(aura::Window* gained_active,
1129                               aura::Window* lost_active) {
1130   if (gained_active)
1131     target_root_window_ = gained_active->GetRootWindow();
1132 }
1133
1134 }  // namespace ash