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