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