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/video_detector.h"
  76 #include "ash/wm/window_animations.h"
  77 #include "ash/wm/window_positioner.h"
  78 #include "ash/wm/window_properties.h"
  79 #include "ash/wm/window_util.h"
  80 #include "ash/wm/workspace_controller.h"
  81 #include "base/bind.h"
  82 #include "base/debug/trace_event.h"
  83 #include "ui/aura/client/aura_constants.h"
  84 #include "ui/aura/env.h"
  85 #include "ui/aura/layout_manager.h"
  86 #include "ui/aura/window.h"
  87 #include "ui/aura/window_event_dispatcher.h"
  88 #include "ui/base/ui_base_switches.h"
  89 #include "ui/compositor/layer.h"
  90 #include "ui/compositor/layer_animator.h"
  91 #include "ui/events/event_target_iterator.h"
  92 #include "ui/gfx/display.h"
  93 #include "ui/gfx/image/image_skia.h"
  94 #include "ui/gfx/screen.h"
  95 #include "ui/gfx/size.h"
  96 #include "ui/keyboard/keyboard.h"
  97 #include "ui/keyboard/keyboard_controller.h"
  98 #include "ui/keyboard/keyboard_switches.h"
  99 #include "ui/keyboard/keyboard_util.h"
 100 #include "ui/message_center/message_center.h"
 101 #include "ui/views/corewm/tooltip_aura.h"
 102 #include "ui/views/corewm/tooltip_controller.h"
 103 #include "ui/views/focus/focus_manager_factory.h"
 104 #include "ui/views/widget/native_widget_aura.h"
 105 #include "ui/views/widget/widget.h"
 106 #include "ui/wm/core/compound_event_filter.h"
 107 #include "ui/wm/core/focus_controller.h"
 108 #include "ui/wm/core/input_method_event_filter.h"
 109 #include "ui/wm/core/shadow_controller.h"
 110 #include "ui/wm/core/user_activity_detector.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 "base/message_loop/message_pump_x11.h"
 119 #endif  // defined(USE_X11)
 120 #include "ash/ash_constants.h"
 121 #include "ash/display/display_change_observer_chromeos.h"
 122 #include "ash/display/display_error_observer_chromeos.h"
 123 #include "ash/display/output_configurator_animation.h"
 124 #include "ash/display/projecting_observer_chromeos.h"
 125 #include "ash/display/resolution_notification_controller.h"
 126 #include "ash/sticky_keys/sticky_keys_controller.h"
 127 #include "ash/system/chromeos/bluetooth/bluetooth_notification_controller.h"
 128 #include "ash/system/chromeos/brightness/brightness_controller_chromeos.h"
 129 #include "ash/system/chromeos/power/power_event_observer.h"
 130 #include "ash/system/chromeos/power/power_status.h"
 131 #include "ash/system/chromeos/power/user_activity_notifier.h"
 132 #include "ash/system/chromeos/power/video_activity_notifier.h"
 133 #include "ash/system/chromeos/session/last_window_closed_logout_reminder.h"
 134 #include "ash/system/chromeos/session/logout_confirmation_controller.h"
 135 #include "base/bind_helpers.h"
 136 #include "base/sys_info.h"
 137 #include "ui/display/chromeos/display_configurator.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 RootWindowController* Shell::GetPrimaryRootWindowController() {
 202   return 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   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 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       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(direction == FORWARD ? FocusCycler::FORWARD
 329                                                   : FocusCycler::BACKWARD);
 330 }
 331
 332 void Shell::SetDisplayWorkAreaInsets(Window* contains,
 333                                      const gfx::Insets& insets) {
 334   if (!display_controller_->UpdateWorkAreaOfDisplayNearestWindow(
 335           contains, insets)) {
 336     return;
 337   }
 338   FOR_EACH_OBSERVER(ShellObserver, observers_,
 339                     OnDisplayWorkAreaInsetsChanged());
 340 }
 341
 342 void Shell::OnLoginStateChanged(user::LoginStatus status) {
 343   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLoginStateChanged(status));
 344 }
 345
 346 void Shell::OnLoginUserProfilePrepared() {
 347   CreateShelf();
 348   CreateKeyboard();
 349 }
 350
 351 void Shell::UpdateAfterLoginStatusChange(user::LoginStatus status) {
 352   RootWindowControllerList controllers = GetAllRootWindowControllers();
 353   for (RootWindowControllerList::iterator iter = controllers.begin();
 354        iter != controllers.end(); ++iter)
 355     (*iter)->UpdateAfterLoginStatusChange(status);
 356 }
 357
 358 void Shell::OnAppTerminating() {
 359   FOR_EACH_OBSERVER(ShellObserver, observers_, OnAppTerminating());
 360 }
 361
 362 void Shell::OnLockStateChanged(bool locked) {
 363   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLockStateChanged(locked));
 364 #ifndef NDEBUG
 365   // Make sure that there is no system modal in Lock layer when unlocked.
 366   if (!locked) {
 367     std::vector<aura::Window*> containers = GetContainersFromAllRootWindows(
 368         kShellWindowId_LockSystemModalContainer, 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::KeyboardController::GetInstance());
 414   } else {
 415     GetPrimaryRootWindowController()->
 416         ActivateKeyboard(keyboard::KeyboardController::GetInstance());
 417   }
 418 }
 419
 420 void Shell::DeactivateKeyboard() {
 421   if (keyboard::KeyboardController::GetInstance()) {
 422     RootWindowControllerList controllers = GetAllRootWindowControllers();
 423     for (RootWindowControllerList::iterator iter = controllers.begin();
 424         iter != controllers.end(); ++iter) {
 425       (*iter)->DeactivateKeyboard(keyboard::KeyboardController::GetInstance());
 426     }
 427   }
 428   keyboard::KeyboardController::ResetInstance(NULL);
 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(new MaximizeModeWindowManager());
 449   } else if (!enable && maximize_mode_window_manager_.get()) {
 450     maximize_mode_window_manager_.reset();
 451   }
 452 }
 453
 454 bool Shell::IsMaximizeModeWindowManagerEnabled() {
 455   return maximize_mode_window_manager_.get() != NULL;
 456 }
 457
 458 void Shell::UpdateShelfVisibility() {
 459   RootWindowControllerList controllers = GetAllRootWindowControllers();
 460   for (RootWindowControllerList::iterator iter = controllers.begin();
 461        iter != controllers.end(); ++iter)
 462     if ((*iter)->shelf())
 463       (*iter)->UpdateShelfVisibility();
 464 }
 465
 466 void Shell::SetShelfAutoHideBehavior(ShelfAutoHideBehavior behavior,
 467                                      aura::Window* root_window) {
 468   ash::ShelfLayoutManager::ForShelf(root_window)->SetAutoHideBehavior(behavior);
 469 }
 470
 471 ShelfAutoHideBehavior Shell::GetShelfAutoHideBehavior(
 472     aura::Window* root_window) const {
 473   return ash::ShelfLayoutManager::ForShelf(root_window)->auto_hide_behavior();
 474 }
 475
 476 void Shell::SetShelfAlignment(ShelfAlignment alignment,
 477                               aura::Window* root_window) {
 478   if (ash::ShelfLayoutManager::ForShelf(root_window)->SetAlignment(alignment)) {
 479     FOR_EACH_OBSERVER(
 480         ShellObserver, observers_, OnShelfAlignmentChanged(root_window));
 481   }
 482 }
 483
 484 ShelfAlignment Shell::GetShelfAlignment(aura::Window* root_window) {
 485   return GetRootWindowController(root_window)
 486       ->GetShelfLayoutManager()
 487       ->GetAlignment();
 488 }
 489
 490 void Shell::SetDimming(bool should_dim) {
 491   RootWindowControllerList controllers = GetAllRootWindowControllers();
 492   for (RootWindowControllerList::iterator iter = controllers.begin();
 493        iter != controllers.end(); ++iter)
 494     (*iter)->screen_dimmer()->SetDimming(should_dim);
 495 }
 496
 497 void Shell::NotifyFullscreenStateChange(bool is_fullscreen,
 498                                         aura::Window* root_window) {
 499   FOR_EACH_OBSERVER(ShellObserver, observers_, OnFullscreenStateChanged(
 500       is_fullscreen, root_window));
 501 }
 502
 503 void Shell::CreateModalBackground(aura::Window* window) {
 504   if (!modality_filter_) {
 505     modality_filter_.reset(new SystemModalContainerEventFilter(this));
 506     AddPreTargetHandler(modality_filter_.get());
 507   }
 508   RootWindowControllerList controllers = GetAllRootWindowControllers();
 509   for (RootWindowControllerList::iterator iter = controllers.begin();
 510        iter != controllers.end(); ++iter)
 511     (*iter)->GetSystemModalLayoutManager(window)->CreateModalBackground();
 512 }
 513
 514 void Shell::OnModalWindowRemoved(aura::Window* removed) {
 515   RootWindowControllerList controllers = GetAllRootWindowControllers();
 516   bool activated = false;
 517   for (RootWindowControllerList::iterator iter = controllers.begin();
 518        iter != controllers.end() && !activated; ++iter) {
 519     activated = (*iter)->GetSystemModalLayoutManager(removed)->
 520         ActivateNextModalWindow();
 521   }
 522   if (!activated) {
 523     RemovePreTargetHandler(modality_filter_.get());
 524     modality_filter_.reset();
 525     for (RootWindowControllerList::iterator iter = controllers.begin();
 526          iter != controllers.end(); ++iter)
 527       (*iter)->GetSystemModalLayoutManager(removed)->DestroyModalBackground();
 528   }
 529 }
 530
 531 WebNotificationTray* Shell::GetWebNotificationTray() {
 532   return GetPrimaryRootWindowController()->shelf()->
 533       status_area_widget()->web_notification_tray();
 534 }
 535
 536 bool Shell::HasPrimaryStatusArea() {
 537   ShelfWidget* shelf = GetPrimaryRootWindowController()->shelf();
 538   return shelf && shelf->status_area_widget();
 539 }
 540
 541 SystemTray* Shell::GetPrimarySystemTray() {
 542   return GetPrimaryRootWindowController()->GetSystemTray();
 543 }
 544
 545 ShelfDelegate* Shell::GetShelfDelegate() {
 546   if (!shelf_delegate_) {
 547     shelf_model_.reset(new ShelfModel);
 548     // Creates ShelfItemDelegateManager before ShelfDelegate.
 549     shelf_item_delegate_manager_.reset(
 550         new ShelfItemDelegateManager(shelf_model_.get()));
 551
 552     shelf_delegate_.reset(delegate_->CreateShelfDelegate(shelf_model_.get()));
 553     scoped_ptr<ShelfItemDelegate> controller(new AppListShelfItemDelegate);
 554
 555     // Finding the shelf model's location of the app list and setting its
 556     // ShelfItemDelegate.
 557     int app_list_index = shelf_model_->GetItemIndexForType(TYPE_APP_LIST);
 558     DCHECK_GE(app_list_index, 0);
 559     ShelfID app_list_id = shelf_model_->items()[app_list_index].id;
 560     DCHECK(app_list_id);
 561     shelf_item_delegate_manager_->SetShelfItemDelegate(app_list_id,
 562                                                        controller.Pass());
 563     shelf_window_watcher_.reset(new ShelfWindowWatcher(
 564         shelf_model_.get(), shelf_item_delegate_manager_.get()));
 565   }
 566   return shelf_delegate_.get();
 567 }
 568
 569 void Shell::SetTouchHudProjectionEnabled(bool enabled) {
 570   if (is_touch_hud_projection_enabled_ == enabled)
 571     return;
 572
 573   is_touch_hud_projection_enabled_ = enabled;
 574   FOR_EACH_OBSERVER(ShellObserver, observers_,
 575                     OnTouchHudProjectionToggled(enabled));
 576 }
 577
 578 #if defined(OS_CHROMEOS)
 579 ash::FirstRunHelper* Shell::CreateFirstRunHelper() {
 580   return new ash::FirstRunHelperImpl;
 581 }
 582
 583 void Shell::SetCursorCompositingEnabled(bool enabled) {
 584   display_controller_->cursor_window_controller()->SetCursorCompositingEnabled(
 585       enabled);
 586   native_cursor_manager_->SetNativeCursorEnabled(!enabled);
 587 }
 588 #endif  // defined(OS_CHROMEOS)
 589
 590 void Shell::DoInitialWorkspaceAnimation() {
 591   return GetPrimaryRootWindowController()->workspace_controller()->
 592       DoInitialAnimation();
 593 }
 594
 595 ////////////////////////////////////////////////////////////////////////////////
 596 // Shell, private:
 597
 598 Shell::Shell(ShellDelegate* delegate)
 599     : target_root_window_(NULL),
 600       scoped_target_root_window_(NULL),
 601       delegate_(delegate),
 602       window_positioner_(new WindowPositioner),
 603       activation_client_(NULL),
 604       accelerometer_controller_(new AccelerometerController()),
 605 #if defined(OS_CHROMEOS)
 606       display_configurator_(new ui::DisplayConfigurator()),
 607 #endif  // defined(OS_CHROMEOS)
 608       native_cursor_manager_(new AshNativeCursorManager),
 609       cursor_manager_(
 610           scoped_ptr< ::wm::NativeCursorManager>(native_cursor_manager_)),
 611       simulate_modal_window_open_for_testing_(false),
 612       is_touch_hud_projection_enabled_(false) {
 613   DCHECK(delegate_.get());
 614   gpu_support_.reset(delegate_->CreateGPUSupport());
 615   display_manager_.reset(new DisplayManager);
 616   display_controller_.reset(new DisplayController);
 617 #if defined(OS_CHROMEOS) && defined(USE_X11)
 618   user_metrics_recorder_.reset(new UserMetricsRecorder);
 619 #endif  // defined(OS_CHROMEOS)
 620
 621 #if defined(OS_CHROMEOS)
 622   PowerStatus::Initialize();
 623 #endif
 624 }
 625
 626 Shell::~Shell() {
 627   TRACE_EVENT0("shutdown", "ash::Shell::Destructor");
 628
 629   delegate_->PreShutdown();
 630
 631   views::FocusManagerFactory::Install(NULL);
 632
 633   // Remove the focus from any window. This will prevent overhead and side
 634   // effects (e.g. crashes) from changing focus during shutdown.
 635   // See bug crbug.com/134502.
 636   aura::client::GetFocusClient(GetPrimaryRootWindow())->FocusWindow(NULL);
 637
 638   // Please keep in same order as in Init() because it's easy to miss one.
 639   if (window_modality_controller_)
 640     window_modality_controller_.reset();
 641 #if defined(OS_CHROMEOS) && defined(USE_X11)
 642   RemovePreTargetHandler(magnifier_key_scroll_handler_.get());
 643   magnifier_key_scroll_handler_.reset();
 644
 645   RemovePreTargetHandler(speech_feedback_handler_.get());
 646   speech_feedback_handler_.reset();
 647 #endif
 648   RemovePreTargetHandler(user_activity_detector_.get());
 649   RemovePreTargetHandler(overlay_filter_.get());
 650   RemovePreTargetHandler(input_method_filter_.get());
 651   RemovePreTargetHandler(accelerator_filter_.get());
 652   RemovePreTargetHandler(event_transformation_handler_.get());
 653   RemovePreTargetHandler(toplevel_window_event_handler_.get());
 654   RemovePostTargetHandler(toplevel_window_event_handler_.get());
 655   RemovePreTargetHandler(system_gesture_filter_.get());
 656   RemovePreTargetHandler(keyboard_metrics_filter_.get());
 657   if (mouse_cursor_filter_)
 658     RemovePreTargetHandler(mouse_cursor_filter_.get());
 659
 660   // TooltipController is deleted with the Shell so removing its references.
 661   RemovePreTargetHandler(tooltip_controller_.get());
 662
 663   // Destroy maximize window manager early on since it has some observers which
 664   // need to be removed.
 665   maximize_mode_controller_.reset();
 666   maximize_mode_window_manager_.reset();
 667
 668   // AppList needs to be released before shelf layout manager, which is
 669   // destroyed with shelf container in the loop below. However, app list
 670   // container is now on top of shelf container and released after it.
 671   // TODO(xiyuan): Move it back when app list container is no longer needed.
 672   app_list_controller_.reset();
 673
 674 #if defined(OS_CHROMEOS)
 675   // Destroy the LastWindowClosedLogoutReminder before the
 676   // LogoutConfirmationController.
 677   last_window_closed_logout_reminder_.reset();
 678
 679   // Destroy the LogoutConfirmationController before the SystemTrayDelegate.
 680   logout_confirmation_controller_.reset();
 681 #endif
 682
 683   // Destroy SystemTrayDelegate before destroying the status area(s).
 684   system_tray_delegate_->Shutdown();
 685   system_tray_delegate_.reset();
 686
 687   locale_notification_controller_.reset();
 688
 689   // Drag-and-drop must be canceled prior to close all windows.
 690   drag_drop_controller_.reset();
 691
 692   // Controllers who have WindowObserver added must be deleted
 693   // before |display_controller_| is deleted.
 694
 695 #if defined(OS_CHROMEOS)
 696   // VideoActivityNotifier must be deleted before |video_detector_| is
 697   // deleted because it's observing video activity through
 698   // VideoDetectorObserver interface.
 699   video_activity_notifier_.reset();
 700 #endif  // defined(OS_CHROMEOS)
 701   video_detector_.reset();
 702
 703   shadow_controller_.reset();
 704   resize_shadow_controller_.reset();
 705
 706   window_selector_controller_.reset();
 707   mru_window_tracker_.reset();
 708
 709   // |shelf_window_watcher_| has a weak pointer to |shelf_Model_|
 710   // and has window observers.
 711   shelf_window_watcher_.reset();
 712
 713   // Destroy all child windows including widgets.
 714   display_controller_->CloseChildWindows();
 715   display_controller_->CloseNonDesktopDisplay();
 716
 717   // Chrome implementation of shelf delegate depends on FocusClient,
 718   // so must be deleted before |focus_client_|.
 719   shelf_delegate_.reset();
 720   focus_client_.reset();
 721
 722   // Destroy SystemTrayNotifier after destroying SystemTray as TrayItems
 723   // needs to remove observers from it.
 724   system_tray_notifier_.reset();
 725
 726   // These need a valid Shell instance to clean up properly, so explicitly
 727   // delete them before invalidating the instance.
 728   // Alphabetical. TODO(oshima): sort.
 729   magnification_controller_.reset();
 730   partial_magnification_controller_.reset();
 731   tooltip_controller_.reset();
 732   event_client_.reset();
 733   nested_dispatcher_controller_.reset();
 734   toplevel_window_event_handler_.reset();
 735   visibility_controller_.reset();
 736   // |shelf_item_delegate_manager_| observes |shelf_model_|. It must be
 737   // destroyed before |shelf_model_| is destroyed.
 738   shelf_item_delegate_manager_.reset();
 739   shelf_model_.reset();
 740
 741   power_button_controller_.reset();
 742   lock_state_controller_.reset();
 743
 744 #if defined(OS_CHROMEOS)
 745   resolution_notification_controller_.reset();
 746 #endif
 747   desktop_background_controller_.reset();
 748
 749   // This also deletes all RootWindows. Note that we invoke Shutdown() on
 750   // DisplayController before resetting |display_controller_|, since destruction
 751   // of its owned RootWindowControllers relies on the value.
 752   display_manager_->CreateScreenForShutdown();
 753   display_controller_->Shutdown();
 754   display_controller_.reset();
 755   screen_position_controller_.reset();
 756   accessibility_delegate_.reset();
 757   new_window_delegate_.reset();
 758   media_delegate_.reset();
 759
 760   keyboard::KeyboardController::ResetInstance(NULL);
 761
 762 #if defined(OS_CHROMEOS)
 763   if (display_change_observer_)
 764     display_configurator_->RemoveObserver(display_change_observer_.get());
 765   if (output_configurator_animation_)
 766     display_configurator_->RemoveObserver(output_configurator_animation_.get());
 767   if (display_error_observer_)
 768     display_configurator_->RemoveObserver(display_error_observer_.get());
 769   if (projecting_observer_)
 770     display_configurator_->RemoveObserver(projecting_observer_.get());
 771   display_change_observer_.reset();
 772 #endif  // defined(OS_CHROMEOS)
 773
 774 #if defined(OS_CHROMEOS)
 775   PowerStatus::Shutdown();
 776 #endif
 777
 778   DCHECK(instance_ == this);
 779   instance_ = NULL;
 780 }
 781
 782 void Shell::Init() {
 783   delegate_->PreInit();
 784   if (keyboard::IsKeyboardUsabilityExperimentEnabled()) {
 785     display_manager_->SetSecondDisplayMode(DisplayManager::VIRTUAL_KEYBOARD);
 786   }
 787   bool display_initialized = display_manager_->InitFromCommandLine();
 788 #if defined(OS_CHROMEOS)
 789   display_configurator_->Init(!gpu_support_->IsPanelFittingDisabled());
 790   output_configurator_animation_.reset(new OutputConfiguratorAnimation());
 791   display_configurator_->AddObserver(output_configurator_animation_.get());
 792
 793   projecting_observer_.reset(new ProjectingObserver());
 794   display_configurator_->AddObserver(projecting_observer_.get());
 795
 796   if (!display_initialized && base::SysInfo::IsRunningOnChromeOS()) {
 797     display_change_observer_.reset(new DisplayChangeObserver);
 798     // Register |display_change_observer_| first so that the rest of
 799     // observer gets invoked after the root windows are configured.
 800     display_configurator_->AddObserver(display_change_observer_.get());
 801     display_error_observer_.reset(new DisplayErrorObserver());
 802     display_configurator_->AddObserver(display_error_observer_.get());
 803     display_configurator_->set_state_controller(display_change_observer_.get());
 804     display_configurator_->set_mirroring_controller(display_manager_.get());
 805     display_configurator_->ForceInitialConfigure(
 806         delegate_->IsFirstRunAfterBoot() ? kChromeOsBootColor : 0);
 807     display_initialized = true;
 808   }
 809 #endif  // defined(OS_CHROMEOS)
 810   if (!display_initialized)
 811     display_manager_->InitDefaultDisplay();
 812
 813   // Install the custom factory first so that views::FocusManagers for Tray,
 814   // Shelf, and WallPaper could be created by the factory.
 815   views::FocusManagerFactory::Install(new AshFocusManagerFactory);
 816
 817   // Env creates the compositor. Historically it seems to have been implicitly
 818   // initialized first by the ActivationController, but now that FocusController
 819   // no longer does this we need to do it explicitly.
 820   aura::Env::CreateInstance();
 821
 822   // The WindowModalityController needs to be at the front of the input event
 823   // pretarget handler list to ensure that it processes input events when modal
 824   // windows are active.
 825   window_modality_controller_.reset(
 826       new ::wm::WindowModalityController(this));
 827
 828   AddPreTargetHandler(this);
 829
 830   env_filter_.reset(new ::wm::CompoundEventFilter);
 831   AddPreTargetHandler(env_filter_.get());
 832
 833   ::wm::FocusController* focus_controller =
 834       new ::wm::FocusController(new wm::AshFocusRules);
 835   focus_client_.reset(focus_controller);
 836   activation_client_ = focus_controller;
 837   activation_client_->AddObserver(this);
 838   focus_cycler_.reset(new FocusCycler());
 839
 840   screen_position_controller_.reset(new ScreenPositionController);
 841   window_tree_host_factory_.reset(delegate_->CreateWindowTreeHostFactory());
 842
 843   display_controller_->Start();
 844   display_controller_->InitPrimaryDisplay();
 845   aura::Window* root_window = display_controller_->GetPrimaryRootWindow();
 846   target_root_window_ = root_window;
 847
 848 #if defined(OS_CHROMEOS)
 849   resolution_notification_controller_.reset(
 850       new ResolutionNotificationController);
 851 #endif
 852
 853   cursor_manager_.SetDisplay(GetScreen()->GetPrimaryDisplay());
 854
 855   nested_dispatcher_controller_.reset(new NestedDispatcherController);
 856   accelerator_controller_.reset(new AcceleratorController);
 857   maximize_mode_controller_.reset(new MaximizeModeController());
 858
 859 #if defined(OS_CHROMEOS) && defined(USE_X11)
 860   magnifier_key_scroll_handler_ = MagnifierKeyScroller::CreateHandler().Pass();
 861   AddPreTargetHandler(magnifier_key_scroll_handler_.get());
 862   speech_feedback_handler_ = SpokenFeedbackToggler::CreateHandler().Pass();
 863   AddPreTargetHandler(speech_feedback_handler_.get());
 864 #endif
 865
 866   // The order in which event filters are added is significant.
 867
 868 #if defined(OS_CHROMEOS)
 869   // The StickyKeysController also rewrites events and must be added
 870   // before observers, but after the EventRewriterEventFilter.
 871   sticky_keys_controller_.reset(new StickyKeysController);
 872   AddPreTargetHandler(sticky_keys_controller_.get());
 873 #endif
 874
 875   // wm::UserActivityDetector passes events to observers, so let them get
 876   // rewritten first.
 877   user_activity_detector_.reset(new ::wm::UserActivityDetector);
 878   AddPreTargetHandler(user_activity_detector_.get());
 879
 880   overlay_filter_.reset(new OverlayEventFilter);
 881   AddPreTargetHandler(overlay_filter_.get());
 882   AddShellObserver(overlay_filter_.get());
 883
 884   input_method_filter_.reset(new ::wm::InputMethodEventFilter(
 885       root_window->GetHost()->GetAcceleratedWidget()));
 886   AddPreTargetHandler(input_method_filter_.get());
 887
 888   accelerator_filter_.reset(new AcceleratorFilter);
 889   AddPreTargetHandler(accelerator_filter_.get());
 890
 891   event_transformation_handler_.reset(new EventTransformationHandler);
 892   AddPreTargetHandler(event_transformation_handler_.get());
 893
 894   toplevel_window_event_handler_.reset(new ToplevelWindowEventHandler);
 895
 896   system_gesture_filter_.reset(new SystemGestureEventFilter);
 897   AddPreTargetHandler(system_gesture_filter_.get());
 898
 899   keyboard_metrics_filter_.reset(new KeyboardUMAEventFilter);
 900   AddPreTargetHandler(keyboard_metrics_filter_.get());
 901
 902   // The keyboard system must be initialized before the RootWindowController is
 903   // created.
 904 #if defined(OS_CHROMEOS)
 905     keyboard::InitializeKeyboard();
 906 #endif
 907
 908   lock_state_controller_.reset(new LockStateController);
 909   power_button_controller_.reset(new PowerButtonController(
 910       lock_state_controller_.get()));
 911 #if defined(OS_CHROMEOS)
 912   // Pass the initial display state to PowerButtonController.
 913   power_button_controller_->OnDisplayModeChanged(
 914       display_configurator_->cached_outputs());
 915 #endif
 916   AddShellObserver(lock_state_controller_.get());
 917
 918   drag_drop_controller_.reset(new DragDropController);
 919   mouse_cursor_filter_.reset(new MouseCursorEventFilter());
 920   PrependPreTargetHandler(mouse_cursor_filter_.get());
 921
 922   // Create Controllers that may need root window.
 923   // TODO(oshima): Move as many controllers before creating
 924   // RootWindowController as possible.
 925   visibility_controller_.reset(new AshVisibilityController);
 926
 927   magnification_controller_.reset(
 928       MagnificationController::CreateInstance());
 929   mru_window_tracker_.reset(new MruWindowTracker(activation_client_));
 930
 931   partial_magnification_controller_.reset(
 932       new PartialMagnificationController());
 933
 934   autoclick_controller_.reset(AutoclickController::CreateInstance());
 935
 936   high_contrast_controller_.reset(new HighContrastController);
 937   video_detector_.reset(new VideoDetector);
 938   window_selector_controller_.reset(new WindowSelectorController());
 939
 940   tooltip_controller_.reset(
 941       new views::corewm::TooltipController(
 942           scoped_ptr<views::corewm::Tooltip>(
 943               new views::corewm::TooltipAura(gfx::SCREEN_TYPE_ALTERNATE))));
 944   AddPreTargetHandler(tooltip_controller_.get());
 945
 946   event_client_.reset(new EventClientImpl);
 947
 948   // This controller needs to be set before SetupManagedWindowMode.
 949   desktop_background_controller_.reset(new DesktopBackgroundController());
 950   user_wallpaper_delegate_.reset(delegate_->CreateUserWallpaperDelegate());
 951
 952   session_state_delegate_.reset(delegate_->CreateSessionStateDelegate());
 953   accessibility_delegate_.reset(delegate_->CreateAccessibilityDelegate());
 954   new_window_delegate_.reset(delegate_->CreateNewWindowDelegate());
 955   media_delegate_.reset(delegate_->CreateMediaDelegate());
 956
 957   resize_shadow_controller_.reset(new ResizeShadowController());
 958   shadow_controller_.reset(
 959       new ::wm::ShadowController(activation_client_));
 960
 961   // Create system_tray_notifier_ before the delegate.
 962   system_tray_notifier_.reset(new ash::SystemTrayNotifier());
 963
 964   // Initialize system_tray_delegate_ before initializing StatusAreaWidget.
 965   system_tray_delegate_.reset(delegate()->CreateSystemTrayDelegate());
 966   DCHECK(system_tray_delegate_.get());
 967
 968   locale_notification_controller_.reset(new LocaleNotificationController);
 969
 970   // Initialize system_tray_delegate_ after StatusAreaWidget is created.
 971   system_tray_delegate_->Initialize();
 972
 973 #if defined(OS_CHROMEOS)
 974   // Create the LogoutConfirmationController after the SystemTrayDelegate.
 975   logout_confirmation_controller_.reset(new LogoutConfirmationController(
 976       base::Bind(&SystemTrayDelegate::SignOut,
 977                  base::Unretained(system_tray_delegate_.get()))));
 978 #endif
 979
 980   // TODO(oshima): Initialize all RootWindowControllers once, and
 981   // initialize controller/delegates above when initializing the
 982   // primary root window controller.
 983   RootWindowController::CreateForPrimaryDisplay(root_window->GetHost());
 984
 985   display_controller_->InitSecondaryDisplays();
 986
 987   // It needs to be created after RootWindowController has been created
 988   // (which calls OnWindowResized has been called, otherwise the
 989   // widget will not paint when restoring after a browser crash.  Also it needs
 990   // to be created after InitSecondaryDisplays() to initialize the wallpapers in
 991   // the correct size.
 992   user_wallpaper_delegate_->InitializeWallpaper();
 993
 994   if (initially_hide_cursor_)
 995     cursor_manager_.HideCursor();
 996   cursor_manager_.SetCursor(ui::kCursorPointer);
 997
 998 #if defined(OS_CHROMEOS)
 999   // Set accelerator controller delegates.
1000   accelerator_controller_->SetBrightnessControlDelegate(
1001       scoped_ptr<ash::BrightnessControlDelegate>(
1002           new ash::system::BrightnessControllerChromeos).Pass());
1003
1004   power_event_observer_.reset(new PowerEventObserver());
1005   user_activity_notifier_.reset(
1006       new UserActivityNotifier(user_activity_detector_.get()));
1007   video_activity_notifier_.reset(
1008       new VideoActivityNotifier(video_detector_.get()));
1009   bluetooth_notification_controller_.reset(new BluetoothNotificationController);
1010   last_window_closed_logout_reminder_.reset(new LastWindowClosedLogoutReminder);
1011 #endif
1012
1013   weak_display_manager_factory_.reset(
1014       new base::WeakPtrFactory<DisplayManager>(display_manager_.get()));
1015   // The compositor thread and main message loop have to be running in
1016   // order to create mirror window. Run it after the main message loop
1017   // is started.
1018   base::MessageLoopForUI::current()->PostTask(
1019       FROM_HERE,
1020       base::Bind(&DisplayManager::CreateMirrorWindowIfAny,
1021                  weak_display_manager_factory_->GetWeakPtr()));
1022 }
1023
1024 void Shell::InitKeyboard() {
1025   if (keyboard::IsKeyboardEnabled()) {
1026     if (keyboard::KeyboardController::GetInstance()) {
1027       RootWindowControllerList controllers = GetAllRootWindowControllers();
1028       for (RootWindowControllerList::iterator iter = controllers.begin();
1029            iter != controllers.end(); ++iter) {
1030         (*iter)->DeactivateKeyboard(
1031             keyboard::KeyboardController::GetInstance());
1032       }
1033     }
1034     keyboard::KeyboardControllerProxy* proxy =
1035         delegate_->CreateKeyboardControllerProxy();
1036     keyboard::KeyboardController::ResetInstance(
1037         new keyboard::KeyboardController(proxy));
1038   }
1039 }
1040
1041 void Shell::InitRootWindow(aura::Window* root_window) {
1042   DCHECK(activation_client_);
1043   DCHECK(visibility_controller_.get());
1044   DCHECK(drag_drop_controller_.get());
1045
1046   aura::client::SetFocusClient(root_window, focus_client_.get());
1047   input_method_filter_->SetInputMethodPropertyInRootWindow(root_window);
1048   aura::client::SetActivationClient(root_window, activation_client_);
1049   ::wm::FocusController* focus_controller =
1050       static_cast< ::wm::FocusController*>(activation_client_);
1051   root_window->AddPreTargetHandler(focus_controller);
1052   aura::client::SetVisibilityClient(root_window, visibility_controller_.get());
1053   aura::client::SetDragDropClient(root_window, drag_drop_controller_.get());
1054   aura::client::SetScreenPositionClient(root_window,
1055                                         screen_position_controller_.get());
1056   aura::client::SetCursorClient(root_window, &cursor_manager_);
1057   aura::client::SetTooltipClient(root_window, tooltip_controller_.get());
1058   aura::client::SetEventClient(root_window, event_client_.get());
1059
1060   aura::client::SetWindowMoveClient(root_window,
1061       toplevel_window_event_handler_.get());
1062   root_window->AddPreTargetHandler(toplevel_window_event_handler_.get());
1063   root_window->AddPostTargetHandler(toplevel_window_event_handler_.get());
1064
1065   if (nested_dispatcher_controller_) {
1066     aura::client::SetDispatcherClient(root_window,
1067                                       nested_dispatcher_controller_.get());
1068   }
1069 }
1070
1071 bool Shell::CanWindowReceiveEvents(aura::Window* window) {
1072   RootWindowControllerList controllers = GetAllRootWindowControllers();
1073   for (RootWindowControllerList::iterator iter = controllers.begin();
1074        iter != controllers.end(); ++iter) {
1075     SystemModalContainerLayoutManager* layout_manager =
1076         (*iter)->GetSystemModalLayoutManager(window);
1077     if (layout_manager && layout_manager->CanWindowReceiveEvents(window))
1078       return true;
1079     // Allow events to fall through to the virtual keyboard even if displaying
1080     // a system modal dialog.
1081     if ((*iter)->IsVirtualKeyboardWindow(window))
1082       return true;
1083   }
1084
1085   return false;
1086 }
1087
1088 ////////////////////////////////////////////////////////////////////////////////
1089 // Shell, ui::EventTarget overrides:
1090
1091 bool Shell::CanAcceptEvent(const ui::Event& event) {
1092   return true;
1093 }
1094
1095 ui::EventTarget* Shell::GetParentTarget() {
1096   return aura::Env::GetInstance();
1097 }
1098
1099 scoped_ptr<ui::EventTargetIterator> Shell::GetChildIterator() const {
1100   return scoped_ptr<ui::EventTargetIterator>();
1101 }
1102
1103 ui::EventTargeter* Shell::GetEventTargeter() {
1104   NOTREACHED();
1105   return NULL;
1106 }
1107
1108 void Shell::OnEvent(ui::Event* event) {
1109 }
1110
1111 ////////////////////////////////////////////////////////////////////////////////
1112 // Shell, aura::client::ActivationChangeObserver implementation:
1113
1114 void Shell::OnWindowActivated(aura::Window* gained_active,
1115                               aura::Window* lost_active) {
1116   if (gained_active)
1117     target_root_window_ = gained_active->GetRootWindow();
1118 }
1119
1120 }  // namespace ash