// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ash/system/status_area_widget.h"

#include <memory>
#include <string>

#include "ash/annotator/annotation_tray.h"
#include "ash/capture_mode/stop_recording_button_tray.h"
#include "ash/constants/ash_features.h"
#include "ash/constants/ash_switches.h"
#include "ash/constants/tray_background_view_catalog.h"
#include "ash/keyboard/ui/keyboard_ui_controller.h"
#include "ash/public/cpp/shelf_config.h"
#include "ash/session/session_controller_impl.h"
#include "ash/shelf/drag_handle.h"
#include "ash/shelf/shelf.h"
#include "ash/shelf/shelf_layout_manager.h"
#include "ash/shelf/shelf_widget.h"
#include "ash/shell.h"
#include "ash/system/accessibility/dictation_button_tray.h"
#include "ash/system/accessibility/mouse_keys/mouse_keys_tray.h"
#include "ash/system/accessibility/select_to_speak/select_to_speak_tray.h"
#include "ash/system/eche/eche_tray.h"
#include "ash/system/focus_mode/focus_mode_tray.h"
#include "ash/system/holding_space/holding_space_tray.h"
#include "ash/system/ime_menu/ime_menu_tray.h"
#include "ash/system/media/media_tray.h"
#include "ash/system/notification_center/notification_center_tray.h"
#include "ash/system/overview/overview_button_tray.h"
#include "ash/system/palette/palette_tray.h"
#include "ash/system/phonehub/phone_hub_tray.h"
#include "ash/system/pods_overflow_tray.h"
#include "ash/system/session/logout_button_tray.h"
#include "ash/system/status_area_animation_controller.h"
#include "ash/system/status_area_widget_delegate.h"
#include "ash/system/tray/status_area_overflow_button_tray.h"
#include "ash/system/tray/tray_background_view.h"
#include "ash/system/tray/tray_constants.h"
#include "ash/system/tray/tray_container.h"
#include "ash/system/unified/date_tray.h"
#include "ash/system/unified/unified_system_tray.h"
#include "ash/system/unified/unified_system_tray_bubble.h"
#include "ash/system/video_conference/video_conference_tray.h"
#include "ash/system/virtual_keyboard/virtual_keyboard_tray.h"
#include "ash/wm/tablet_mode/tablet_mode_controller.h"
#include "ash/wm/window_pin_util.h"
#include "ash/wm_mode/wm_mode_button_tray.h"
#include "base/command_line.h"
#include "base/containers/adapters.h"
#include "base/i18n/time_formatting.h"
#include "base/metrics/histogram_macros.h"
#include "chromeos/ui/base/window_pin_type.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/scoped_layer_animation_settings.h"
#include "ui/display/display.h"
#include "ui/display/screen.h"
#include "ui/message_center/message_center.h"
#include "ui/message_center/message_center_types.h"

namespace ash {

////////////////////////////////////////////////////////////////////////////////
// StatusAreaWidget

StatusAreaWidget::StatusAreaWidget(aura::Window* status_container, Shelf* shelf)
    : status_area_widget_delegate_(new StatusAreaWidgetDelegate(shelf)),
      shelf_(shelf) {
  DCHECK(status_container);
  DCHECK(shelf);
  views::Widget::InitParams params(
      views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET,
      views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
  params.delegate = status_area_widget_delegate_.get();
  params.name = "StatusAreaWidget";
  params.opacity = views::Widget::InitParams::WindowOpacity::kTranslucent;
  params.parent = status_container;
  Init(std::move(params));
  set_focus_on_creation(false);
  SetContentsView(status_area_widget_delegate_);

  Shell::Get()->AddShellObserver(this);
}

void StatusAreaWidget::Initialize() {
  DCHECK(!initialized_);

  // Create the child views, left to right.
  overflow_button_tray_ =
      AddTrayButton(std::make_unique<StatusAreaOverflowButtonTray>(shelf_));
  if (features::IsVideoConferenceEnabled()) {
    video_conference_tray_ =
        AddTrayButton(std::make_unique<VideoConferenceTray>(shelf_));
  }
  focus_mode_tray_ = AddTrayButton(std::make_unique<FocusModeTray>(shelf_));
  holding_space_tray_ =
      AddTrayButton(std::make_unique<HoldingSpaceTray>(shelf_));
  logout_button_tray_ =
      AddTrayButton(std::make_unique<LogoutButtonTray>(shelf_));
  dictation_button_tray_ = AddTrayButton(std::make_unique<DictationButtonTray>(
      shelf_, TrayBackgroundViewCatalogName::kDictationStatusArea));
  mouse_keys_tray_ = AddTrayButton(std::make_unique<MouseKeysTray>(
      shelf_, TrayBackgroundViewCatalogName::kMouseKeysStatusArea));
  select_to_speak_tray_ = AddTrayButton(std::make_unique<SelectToSpeakTray>(
      shelf_, TrayBackgroundViewCatalogName::kSelectToSpeakStatusArea));
  ime_menu_tray_ = AddTrayButton(std::make_unique<ImeMenuTray>(shelf_));
  virtual_keyboard_tray_ = AddTrayButton(std::make_unique<VirtualKeyboardTray>(
      shelf_, TrayBackgroundViewCatalogName::kVirtualKeyboardStatusArea));

  stop_recording_button_tray_ =
      AddTrayButton(std::make_unique<StopRecordingButtonTray>(shelf_));

  annotation_tray_ = AddTrayButton(std::make_unique<AnnotationTray>(shelf_));

  palette_tray_ = AddTrayButton(std::make_unique<PaletteTray>(shelf_));

  media_tray_ = AddTrayButton(std::make_unique<MediaTray>(shelf_));

  if (features::IsEcheSWAEnabled()) {
    eche_tray_ = AddTrayButton(std::make_unique<EcheTray>(shelf_));
  }

  if (features::IsPhoneHubEnabled()) {
    phone_hub_tray_ = AddTrayButton(std::make_unique<PhoneHubTray>(shelf_));
  }

  if (features::IsWmModeEnabled()) {
    wm_mode_button_tray_ =
        AddTrayButton(std::make_unique<WmModeButtonTray>(shelf_));
  }

  if (features::IsScalableShelfPodsEnabled()) {
    pods_overflow_tray_ =
        AddTrayButton(std::make_unique<PodsOverflowTray>(shelf_));
  }

  notification_center_tray_ =
      AddTrayButton(std::make_unique<NotificationCenterTray>(shelf_));
  notification_center_tray_->AddObserver(this);
  animation_controller_ = std::make_unique<StatusAreaAnimationController>(
      notification_center_tray());
  auto unified_system_tray = std::make_unique<UnifiedSystemTray>(shelf_);
  unified_system_tray_ = unified_system_tray.get();
  date_tray_ =
      AddTrayButton(std::make_unique<DateTray>(shelf_, unified_system_tray_));
  AddTrayButton(std::move(unified_system_tray));

  overview_button_tray_ =
      AddTrayButton(std::make_unique<OverviewButtonTray>(shelf_));

  // Each tray_button's animation will be disabled for the life time of this
  // local `animation_disablers`, which means the closures to enable the
  // animation will be executed when it's out of this method (Initialize())
  // scope.
  std::list<base::ScopedClosureRunner> animation_disablers;

  // Initialize after all trays have been created.
  for (TrayBackgroundView* tray_button : tray_buttons_) {
    tray_button->Initialize();
    animation_disablers.push_back(tray_button->DisableShowAnimation());
  }

  EnsureTrayOrder();

  UpdateAfterLoginStatusChange(
      Shell::Get()->session_controller()->login_status());
  UpdateLayout(/*animate=*/false);

  Shell::Get()->session_controller()->AddObserver(this);

  // NOTE: Container may be hidden depending on login/display state.
  Show();

  initialized_ = true;
}

StatusAreaWidget::~StatusAreaWidget() {
  Shell::Get()->RemoveShellObserver(this);
  Shell::Get()->session_controller()->RemoveObserver(this);

  // Resets `animation_controller_` before destroying
  // `notification_center_tray_` so that we don't run into a UaF.
  animation_controller_.reset(nullptr);

  // `TrayBubbleView` might be deleted after `StatusAreaWidget`, so we reset the
  // pointer here to avoid dangling pointer.
  open_shelf_pod_bubble_ = nullptr;

  // All tray pods are deleted upon shutdown of `status_area_widget_delegate_`,
  // so their pointers are reset here to prevent them from dangling.
  // TODO(b/338090322): Handle all dangling tray pointers here.
  pods_overflow_tray_ = nullptr;

  status_area_widget_delegate_->Shutdown();
}

// static
StatusAreaWidget* StatusAreaWidget::ForWindow(aura::Window* window) {
  return Shelf::ForWindow(window)->status_area_widget();
}

void StatusAreaWidget::UpdateAfterLoginStatusChange(LoginStatus login_status) {
  if (login_status_ == login_status) {
    return;
  }
  login_status_ = login_status;

  for (TrayBackgroundView* tray_button : tray_buttons_) {
    tray_button->UpdateAfterLoginStatusChange();
  }
}

void StatusAreaWidget::SetSystemTrayVisibility(bool visible) {
  unified_system_tray_->SetVisiblePreferred(visible);
  date_tray_->SetVisiblePreferred(visible);
  notification_center_tray_->OnSystemTrayVisibilityChanged(visible);

  if (visible) {
    Show();
  } else {
    unified_system_tray_->CloseBubble();
    Hide();
  }
}

void StatusAreaWidget::OnSessionStateChanged(
    session_manager::SessionState state) {
  for (TrayBackgroundView* tray_button : tray_buttons_) {
    tray_button->UpdateBackground();
  }
}

void StatusAreaWidget::UpdateCollapseState() {
  collapse_state_ = CalculateCollapseState();

  if (collapse_state_ == CollapseState::COLLAPSED) {
    CalculateButtonVisibilityForCollapsedState();
  } else {
    // All tray buttons are visible when the status area is not collapsible.
    // This is the most common state. They are also all visible when the status
    // area is expanded by the user.
    overflow_button_tray_->SetVisiblePreferred(collapse_state_ ==
                                               CollapseState::EXPANDED);
    for (TrayBackgroundView* tray_button : tray_buttons_) {
      tray_button->set_show_when_collapsed(true);
      tray_button->UpdateAfterStatusAreaCollapseChange();
    }
  }

  status_area_widget_delegate_->OnStatusAreaCollapseStateChanged(
      collapse_state_);

  bool overlap =
      shelf_->shelf_widget()->GetDragHandle()->GetBoundsInScreen().Intersects(
          status_area_widget_delegate_->GetBoundsInScreen());

  if (collapse_state_ == CollapseState::EXPANDED && overlap) {
    // Hide the drag handle if the status_area_widget_delegate_ overlaps
    // expected drag handle bounds. Otherwise show the drag handle.
    shelf_->shelf_widget()->GetDragHandle()->HideDragHandleNudge(
        contextual_tooltip::DismissNudgeReason::kOther,
        /*animate*/ false);
    shelf_->shelf_widget()->GetDragHandle()->SetVisible(false);
  } else if (collapse_state_ == CollapseState::COLLAPSED) {
    shelf_->shelf_widget()->GetDragHandle()->SetVisible(true);
  }
}

void StatusAreaWidget::LogVisiblePodCountMetric() {
  int visible_pod_count = 0;
  for (ash::TrayBackgroundView* tray_button : tray_buttons_) {
    switch (tray_button->catalog_name()) {
      case TrayBackgroundViewCatalogName::kUnifiedSystem:
      case TrayBackgroundViewCatalogName::kStatusAreaOverflowButton:
      case TrayBackgroundViewCatalogName::kDateTray:
      case TrayBackgroundViewCatalogName::kNotificationCenter:
        // These pods always show, ignore them.
        continue;

      case TrayBackgroundViewCatalogName::kSelectToSpeakAccessibilityWindow:
      case TrayBackgroundViewCatalogName::kDictationAccesibilityWindow:
      case TrayBackgroundViewCatalogName::kVirtualKeyboardAccessibilityWindow:
        // These pods show in an unrelated menu.
        continue;

      case TrayBackgroundViewCatalogName::kOverview:
      case TrayBackgroundViewCatalogName::kTestCatalogName:
      case TrayBackgroundViewCatalogName::kImeMenu:
      case TrayBackgroundViewCatalogName::kHoldingSpace:
      case TrayBackgroundViewCatalogName::kScreenCaptureStopRecording:
      case TrayBackgroundViewCatalogName::kProjectorAnnotation:
      case TrayBackgroundViewCatalogName::kDictationStatusArea:
      case TrayBackgroundViewCatalogName::kSelectToSpeakStatusArea:
      case TrayBackgroundViewCatalogName::kEche:
      case TrayBackgroundViewCatalogName::kMediaPlayer:
      case TrayBackgroundViewCatalogName::kPalette:
      case TrayBackgroundViewCatalogName::kPhoneHub:
      case TrayBackgroundViewCatalogName::kPodsOverflow:
      case TrayBackgroundViewCatalogName::kLogoutButton:
      case TrayBackgroundViewCatalogName::kVirtualKeyboardStatusArea:
      case TrayBackgroundViewCatalogName::kWmMode:
      case TrayBackgroundViewCatalogName::kVideoConferenceTray:
      case TrayBackgroundViewCatalogName::kFocusMode:
      case TrayBackgroundViewCatalogName::kMouseKeysStatusArea:
        if (!tray_button->GetVisible()) {
          continue;
        }
        visible_pod_count += 1;
        break;
    }
  }

  if (display::Screen::Get()->InTabletMode()) {
    UMA_HISTOGRAM_COUNTS_100("ChromeOS.SystemTray.Tablet.ShelfPodCount",
                             visible_pod_count);
  } else {
    UMA_HISTOGRAM_COUNTS_100("ChromeOS.SystemTray.ShelfPodCount",
                             visible_pod_count);
  }
}

void StatusAreaWidget::CalculateTargetBounds() {
  for (TrayBackgroundView* tray_button : tray_buttons_) {
    tray_button->CalculateTargetBounds();
  }
  status_area_widget_delegate_->CalculateTargetBounds();

  gfx::Size status_size(status_area_widget_delegate_->GetTargetBounds().size());
  const gfx::Size shelf_size = shelf_->shelf_widget()->GetTargetBounds().size();
  const gfx::Point shelf_origin =
      shelf_->shelf_widget()->GetTargetBounds().origin();

  if (shelf_->IsHorizontalAlignment()) {
    status_size.set_height(shelf_size.height());
  } else {
    status_size.set_width(shelf_size.width());
  }

  gfx::Point status_origin = shelf_->SelectValueForShelfAlignment(
      gfx::Point(0, 0),
      gfx::Point(shelf_size.width() - status_size.width(),
                 shelf_size.height() - status_size.height()),
      gfx::Point(0, shelf_size.height() - status_size.height()));
  if (shelf_->IsHorizontalAlignment() && !base::i18n::IsRTL()) {
    status_origin.set_x(shelf_size.width() - status_size.width());
  }
  status_origin.Offset(shelf_origin.x(), shelf_origin.y());
  target_bounds_ = gfx::Rect(status_origin, status_size);
}

gfx::Rect StatusAreaWidget::GetTargetBounds() const {
  return target_bounds_;
}

void StatusAreaWidget::UpdateLayout(bool animate) {
  const LayoutInputs new_layout_inputs = GetLayoutInputs();
  if (layout_inputs_ == new_layout_inputs) {
    return;
  }

  if (!new_layout_inputs.should_animate) {
    animate = false;
  }

  for (TrayBackgroundView* tray_button : tray_buttons_) {
    tray_button->UpdateLayout();
  }
  status_area_widget_delegate_->UpdateLayout(animate);

  // Having a window which is visible but does not have an opacity is an
  // illegal state.
  ui::Layer* layer = GetNativeView()->layer();
  layer->SetOpacity(new_layout_inputs.opacity);
  if (new_layout_inputs.opacity) {
    ShowInactive();
  } else {
    Hide();
  }

  ui::ScopedLayerAnimationSettings animation_setter(layer->GetAnimator());
  animation_setter.SetTransitionDuration(
      animate ? ShelfConfig::Get()->shelf_animation_duration()
              : base::Milliseconds(0));
  animation_setter.SetTweenType(gfx::Tween::EASE_OUT);
  animation_setter.SetPreemptionStrategy(
      ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
  SetBounds(new_layout_inputs.bounds);
  layout_inputs_ = new_layout_inputs;
}

void StatusAreaWidget::UpdateTargetBoundsForGesture(int shelf_position) {
  if (shelf_->IsHorizontalAlignment()) {
    target_bounds_.set_y(shelf_position);
  } else {
    target_bounds_.set_x(shelf_position);
  }
}

void StatusAreaWidget::OnPinnedStateChanged(aura::Window* pinned_window) {
  // Close all tray bubbles when in locked fullscreen mode to prevent users from
  // exiting this mode.
  if (GetWindowPinType(pinned_window) ==
      chromeos::WindowPinType::kLockedFullscreen) {
    for (ash::TrayBackgroundView* const tray_button : tray_buttons_) {
      tray_button->CloseBubble(
          TrayBackgroundView::CloseReason::kWindowActivation);
    }
  }
}

void StatusAreaWidget::HandleLocaleChange() {
  // Here we force the layer's bounds to be updated for text direction (if
  // needed).
  status_area_widget_delegate_->RemoveAllChildViewsWithoutDeleting();

  for (ash::TrayBackgroundView* tray_button : tray_buttons_) {
    tray_button->HandleLocaleChange();
    status_area_widget_delegate_->AddChildView(tray_button);
  }
  EnsureTrayOrder();
}

void StatusAreaWidget::CalculateButtonVisibilityForCollapsedState() {
  if (!initialized_) {
    return;
  }

  DCHECK(collapse_state_ == CollapseState::COLLAPSED);

  bool force_collapsible = base::CommandLine::ForCurrentProcess()->HasSwitch(
      switches::kAshForceStatusAreaCollapsible);

  // If |stop_recording_button_tray_| is visible, make some space in tray for
  // it.
  const int stop_recording_button_width =
      stop_recording_button_tray_->visible_preferred()
          ? stop_recording_button_tray_->GetPreferredSize().width()
          : 0;

  // We update visibility of each tray button based on the available width.
  const int available_width = GetCollapseAvailableWidth(force_collapsible) -
                              stop_recording_button_width;

  // First, reset all tray button to be hidden.
  overflow_button_tray_->ResetStateToCollapsed();
  for (TrayBackgroundView* tray_button : tray_buttons_) {
    tray_button->set_show_when_collapsed(false);
  }

  // Iterate backwards making tray buttons visible until |available_width| is
  // exceeded.
  TrayBackgroundView* previous_tray = nullptr;
  bool show_overflow_button = false;
  int used_width = 0;
  for (TrayBackgroundView* tray : base::Reversed(tray_buttons_)) {
    // Skip non-enabled tray buttons.
    if (!tray->visible_preferred()) {
      continue;
    }
    // Skip |stop_recording_button_tray_| since it's always visible.
    if (tray == stop_recording_button_tray_) {
      continue;
    }

    // Show overflow button once available width is exceeded.
    int tray_width = tray->tray_container()->GetPreferredSize().width();
    if (used_width + tray_width > available_width) {
      show_overflow_button = true;

      // Maybe remove the last tray button to make room for the overflow tray.
      int overflow_button_width =
          overflow_button_tray_->GetPreferredSize().width();
      if (previous_tray &&
          used_width + overflow_button_width > available_width) {
        previous_tray->set_show_when_collapsed(false);
      }
      break;
    }

    tray->set_show_when_collapsed(true);
    previous_tray = tray;
    used_width += tray_width;
  }

  // Skip |stop_recording_button_tray_| so it's always visible.
  if (stop_recording_button_tray_->visible_preferred()) {
    stop_recording_button_tray_->set_show_when_collapsed(true);
  }

  overflow_button_tray_->SetVisiblePreferred(show_overflow_button);
  overflow_button_tray_->UpdateAfterStatusAreaCollapseChange();
  for (TrayBackgroundView* tray_button : tray_buttons_) {
    tray_button->UpdateAfterStatusAreaCollapseChange();
  }
}

void StatusAreaWidget::EnsureTrayOrder() {
  if (annotation_tray_) {
    status_area_widget_delegate_->ReorderChildView(annotation_tray_, 1);
  }
  status_area_widget_delegate_->ReorderChildView(stop_recording_button_tray_,
                                                 annotation_tray_ ? 2 : 1);
}

StatusAreaWidget::CollapseState StatusAreaWidget::CalculateCollapseState()
    const {
  // The status area is only collapsible in tablet mode. Otherwise, we just show
  // all trays.
  if (!Shell::Get()->tablet_mode_controller()) {
    return CollapseState::NOT_COLLAPSIBLE;
  }

  // An update may occur during initialization of the shelf, so just skip it.
  if (!initialized_) {
    return CollapseState::NOT_COLLAPSIBLE;
  }

  bool is_collapsible =
      display::Screen::Get()->InTabletMode() && ShelfConfig::Get()->is_in_app();

  bool force_collapsible = base::CommandLine::ForCurrentProcess()->HasSwitch(
      switches::kAshForceStatusAreaCollapsible);

  is_collapsible |= force_collapsible;
  CollapseState state = CollapseState::NOT_COLLAPSIBLE;
  if (is_collapsible) {
    // Update the collapse state based on the previous overflow button state.
    state = overflow_button_tray_->state() ==
                    StatusAreaOverflowButtonTray::CLICK_TO_EXPAND
                ? CollapseState::COLLAPSED
                : CollapseState::EXPANDED;
  } else {
    state = CollapseState::NOT_COLLAPSIBLE;
  }

  if (state == CollapseState::COLLAPSED) {
    // We might not need to be collapsed, if there is enough space for all the
    // buttons.
    const int available_width = GetCollapseAvailableWidth(force_collapsible);

    int used_width = 0;
    for (TrayBackgroundView* tray : base::Reversed(tray_buttons_)) {
      // If we reach the final overflow tray button, then all the tray buttons
      // fit and there is no need for a collapse state.
      if (tray == overflow_button_tray_) {
        return CollapseState::NOT_COLLAPSIBLE;
      }

      // Skip non-enabled tray buttons.
      if (!tray->visible_preferred()) {
        continue;
      }
      int tray_width = tray->tray_container()->GetPreferredSize().width();
      if (used_width + tray_width > available_width) {
        break;
      }

      used_width += tray_width;
    }
  }
  return state;
}

TrayBackgroundView* StatusAreaWidget::GetSystemTrayAnchor() const {
  // Use the target visibility of the layer instead of the visibility of the
  // view because the view is still visible when fading away, but we do not want
  // to anchor to this element in that case.
  if (overview_button_tray_->layer()->GetTargetVisibility()) {
    return overview_button_tray_;
  }

  return unified_system_tray_;
}

bool StatusAreaWidget::ShouldShowShelf() const {
  // If it has main bubble, return true.
  if (unified_system_tray_->IsBubbleShown()) {
    return true;
  }

  // If any tray is showing a context menu, the shelf should be visible.
  for (TrayBackgroundView* tray_button : tray_buttons_) {
    if (tray_button->IsShowingMenu()) {
      return true;
    }
  }

  // If it has a slider bubble, return false.
  if (unified_system_tray_->IsSliderBubbleShown()) {
    return false;
  }

  // Some TrayBackgroundViews' cache their bubble, the shelf should only be
  // forced to show if the bubble is visible, and we should not show the shelf
  // for cached, hidden bubbles.
  if (open_shelf_pod_bubble_) {
    for (TrayBackgroundView* tray_button : tray_buttons_) {
      if (!tray_button->GetBubbleView()) {
        continue;
      }

      // Any tray bubble is showing, show shelf.
      if (tray_button->GetBubbleView()->GetVisible()) {
        return true;
      }

      // Tray bubble view is not null and not visible, tray bubble is cached
      // for hidden case. If the tray caches the view for hidden, we should
      // hide self otherwise show shelf.
      if (!tray_button->GetBubbleView()->GetVisible() &&
          !tray_button->CacheBubbleViewForHide()) {
        return true;
      }
    }
  }

  // No cases to show shelf, returns false to hide shelf.
  return false;
}

bool StatusAreaWidget::IsMessageBubbleShown() const {
  return unified_system_tray_->IsBubbleShown();
}

void StatusAreaWidget::SchedulePaint() {
  for (TrayBackgroundView* tray_button : tray_buttons_) {
    tray_button->SchedulePaint();
  }
}

bool StatusAreaWidget::OnNativeWidgetActivationChanged(bool active) {
  if (!Widget::OnNativeWidgetActivationChanged(active)) {
    return false;
  }
  if (active) {
    status_area_widget_delegate_->SetPaneFocusAndFocusDefault();
  }
  return true;
}

void StatusAreaWidget::InitializeTrayButtonsAccessibleNavFocus() {
  for (TrayBackgroundView* tray_button : tray_buttons_) {
    tray_button->UpdateAccessibleNavFocus(shelf_);
  }
}

void StatusAreaWidget::SetOpenShelfPodBubble(
    TrayBubbleView* open_shelf_pod_bubble) {
  if (open_shelf_pod_bubble_ == open_shelf_pod_bubble) {
    return;
  }

  DCHECK(unified_system_tray_);

  if (open_shelf_pod_bubble) {
    DCHECK(open_shelf_pod_bubble->GetBubbleType() ==
           TrayBubbleView::TrayBubbleType::kShelfPodBubble);

    // We only keep track of bubbles that are anchored to the status area
    // widget.
    DCHECK(open_shelf_pod_bubble->IsAnchoredToStatusArea());

    // There should be only one shelf pod bubble open at a time, so we will
    // close the current bubble for the new one to come in.
    if (open_shelf_pod_bubble_) {
      open_shelf_pod_bubble_->CloseBubbleView();
      open_shelf_pod_bubble_ = nullptr;
    }
  }

  open_shelf_pod_bubble_ = open_shelf_pod_bubble;
  shelf()->shelf_layout_manager()->OnShelfTrayBubbleVisibilityChanged(
      /*bubble_shown=*/open_shelf_pod_bubble_);
}

void StatusAreaWidget::InitializeAccessibleProperties() {
  status_area_widget_delegate()->UpdateAccessiblePreviousAndNextFocus();
}

void StatusAreaWidget::OnViewIsDeleting(views::View* observed_view) {
  CHECK(observed_view == notification_center_tray_);
  notification_center_tray_->RemoveObserver(this);
}

void StatusAreaWidget::OnViewVisibilityChanged(views::View* observed_view,
                                               views::View* starting_view,
                                               bool visible) {
  CHECK(observed_view == notification_center_tray_);
  UpdateDateTrayRoundedCorners();
}

void StatusAreaWidget::OnMouseEvent(ui::MouseEvent* event) {
  if (event->IsMouseWheelEvent()) {
    ui::MouseWheelEvent* mouse_wheel_event = event->AsMouseWheelEvent();
    shelf_->ProcessMouseWheelEvent(mouse_wheel_event);
    return;
  }

  // Clicking anywhere except the virtual keyboard tray icon should hide the
  // virtual keyboard.
  gfx::Point location = event->location();
  views::View::ConvertPointFromWidget(virtual_keyboard_tray_, &location);
  if (event->type() == ui::EventType::kMousePressed &&
      !virtual_keyboard_tray_->HitTestPoint(location)) {
    keyboard::KeyboardUIController::Get()->HideKeyboardImplicitlyByUser();
  }
  views::Widget::OnMouseEvent(event);
}

void StatusAreaWidget::OnGestureEvent(ui::GestureEvent* event) {
  // Tapping anywhere except the virtual keyboard tray icon should hide the
  // virtual keyboard.
  gfx::Point location = event->location();
  views::View::ConvertPointFromWidget(virtual_keyboard_tray_, &location);
  if (event->type() == ui::EventType::kGestureTapDown &&
      !virtual_keyboard_tray_->HitTestPoint(location)) {
    keyboard::KeyboardUIController::Get()->HideKeyboardImplicitlyByUser();
  }
  views::Widget::OnGestureEvent(event);
}

void StatusAreaWidget::OnScrollEvent(ui::ScrollEvent* event) {
  shelf_->ProcessScrollEvent(event);
  if (!event->handled()) {
    views::Widget::OnScrollEvent(event);
  }
}

template <typename TrayButtonT>
TrayButtonT* StatusAreaWidget::AddTrayButton(
    std::unique_ptr<TrayButtonT> tray_button) {
  tray_buttons_.push_back(tray_button.get());
  return status_area_widget_delegate_->AddChildView(std::move(tray_button));
}
// Specialization declared here for use in tests.
template TrayBackgroundView* StatusAreaWidget::AddTrayButton<
    TrayBackgroundView>(std::unique_ptr<TrayBackgroundView> tray_button);

StatusAreaWidget::LayoutInputs StatusAreaWidget::GetLayoutInputs() const {
  unsigned int child_visibility_bitmask = 0;
  DCHECK(tray_buttons_.size() <
         std::numeric_limits<decltype(child_visibility_bitmask)>::digits);
  for (unsigned int i = 0; i < tray_buttons_.size(); ++i) {
    if (tray_buttons_[i]->GetVisible()) {
      child_visibility_bitmask |= 1 << i;
    }
  }

  bool should_animate = true;

  // Do not animate when tray items are added and removed (See
  // crbug.com/1067199).
  if (layout_inputs_) {
    const bool is_horizontal_alignment = shelf_->IsHorizontalAlignment();
    const gfx::Rect current_bounds = layout_inputs_->bounds;
    if ((is_horizontal_alignment &&
         current_bounds.width() != target_bounds_.width()) ||
        (!is_horizontal_alignment &&
         current_bounds.height() != target_bounds_.height())) {
      should_animate = false;
    }
  }

  return {target_bounds_, CalculateCollapseState(),
          shelf_->shelf_layout_manager()->GetOpacity(),
          child_visibility_bitmask, should_animate};
}

void StatusAreaWidget::UpdateDateTrayRoundedCorners() {
  if (!date_tray_) {
    return;
  }

  date_tray_->SetRoundedCornerBehavior(
      notification_center_tray_->GetVisible()
          ? TrayBackgroundView::RoundedCornerBehavior::kNotRounded
          : TrayBackgroundView::RoundedCornerBehavior::kStartRounded);
}

int StatusAreaWidget::GetCollapseAvailableWidth(bool force_collapsible) const {
  const int shelf_width =
      shelf_->shelf_widget()->GetClientAreaBoundsInScreen().width();

  if (!force_collapsible) {
    return shelf_width / 2 - kStatusAreaLeftPaddingForOverflow;
  }

  int available_width = kStatusAreaForceCollapseAvailableWidth;
  // Add the date tray width to the collapse available width.
  DCHECK(date_tray_);
  available_width += date_tray_->tray_container()->GetPreferredSize().width();

  return available_width;
}

void StatusAreaWidget::OnLockStateChanged(bool locked) {
  for (ash::TrayBackgroundView* tray_button : tray_buttons_) {
    tray_button->UpdateAfterLockStateChange(locked);
  }
}

}  // namespace ash