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

#include "ash/system/tray/tray_background_view.h"

#include "ash/ash_switches.h"
#include "ash/root_window_controller.h"
#include "ash/screen_ash.h"
#include "ash/shelf/shelf_layout_manager.h"
#include "ash/shelf/shelf_widget.h"
#include "ash/shell.h"
#include "ash/shell_window_ids.h"
#include "ash/system/status_area_widget.h"
#include "ash/system/status_area_widget_delegate.h"
#include "ash/system/tray/system_tray.h"
#include "ash/system/tray/tray_constants.h"
#include "ash/system/tray/tray_event_filter.h"
#include "ash/wm/property_util.h"
#include "ash/wm/window_animations.h"
#include "grit/ash_resources.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#include "ui/base/accessibility/accessible_view_state.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/screen.h"
#include "ui/gfx/skia_util.h"
#include "ui/views/background.h"
#include "ui/views/layout/box_layout.h"

namespace {

const int kTrayBackgroundAlpha = 100;
const int kTrayBackgroundHoverAlpha = 150;
const SkColor kTrayBackgroundPressedColor = SkColorSetRGB(66, 129, 244);

// Adjust the size of TrayContainer with additional padding.
const int kTrayContainerVerticalPaddingBottomAlignment  = 1;
const int kTrayContainerHorizontalPaddingBottomAlignment  = 1;
const int kTrayContainerVerticalPaddingVerticalAlignment  = 1;
const int kTrayContainerHorizontalPaddingVerticalAlignment = 1;

const int kAnimationDurationForPopupMS = 200;

}  // namespace

using views::TrayBubbleView;

namespace ash {
namespace internal {

// static
const char TrayBackgroundView::kViewClassName[] = "tray/TrayBackgroundView";

// Used to track when the anchor widget changes position on screen so that the
// bubble position can be updated.
class TrayBackgroundView::TrayWidgetObserver : public views::WidgetObserver {
 public:
  explicit TrayWidgetObserver(TrayBackgroundView* host)
      : host_(host) {
  }

  virtual void OnWidgetBoundsChanged(views::Widget* widget,
                                     const gfx::Rect& new_bounds) OVERRIDE {
    host_->AnchorUpdated();
  }

  virtual void OnWidgetVisibilityChanged(views::Widget* widget,
                                         bool visible) OVERRIDE {
    host_->AnchorUpdated();
  }

 private:
  TrayBackgroundView* host_;

  DISALLOW_COPY_AND_ASSIGN(TrayWidgetObserver);
};

class TrayBackground : public views::Background {
 public:
  const static int kImageTypeDefault = 0;
  const static int kImageTypeOnBlack = 1;
  const static int kImageTypePressed = 2;
  const static int kNumStates = 3;

  const static int kImageHorizontal = 0;
  const static int kImageVertical = 1;
  const static int kNumOrientations = 2;

  explicit TrayBackground(TrayBackgroundView* tray_background_view) :
      tray_background_view_(tray_background_view) {
    set_alpha(kTrayBackgroundAlpha);
    ResourceBundle& rb = ResourceBundle::GetSharedInstance();
    leading_images_[kImageHorizontal][kImageTypeDefault] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_HORIZ_LEFT).ToImageSkia();
    middle_images_[kImageHorizontal][kImageTypeDefault] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_HORIZ_CENTER).ToImageSkia();
    trailing_images_[kImageHorizontal][kImageTypeDefault] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_HORIZ_RIGHT).ToImageSkia();

    leading_images_[kImageHorizontal][kImageTypeOnBlack] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_HORIZ_LEFT_ONBLACK).ToImageSkia();
    middle_images_[kImageHorizontal][kImageTypeOnBlack] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_HORIZ_CENTER_ONBLACK).ToImageSkia();
    trailing_images_[kImageHorizontal][kImageTypeOnBlack] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_HORIZ_RIGHT_ONBLACK).ToImageSkia();

    leading_images_[kImageHorizontal][kImageTypePressed] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_HORIZ_LEFT_PRESSED).ToImageSkia();
    middle_images_[kImageHorizontal][kImageTypePressed] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_HORIZ_CENTER_PRESSED).ToImageSkia();
    trailing_images_[kImageHorizontal][kImageTypePressed] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_HORIZ_RIGHT_PRESSED).ToImageSkia();

    leading_images_[kImageVertical][kImageTypeDefault] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_VERTICAL_TOP).ToImageSkia();
    middle_images_[kImageVertical][kImageTypeDefault] =
        rb.GetImageNamed(
            IDR_AURA_TRAY_BG_VERTICAL_CENTER).ToImageSkia();
    trailing_images_[kImageVertical][kImageTypeDefault] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_VERTICAL_BOTTOM).ToImageSkia();

    leading_images_[kImageVertical][kImageTypeOnBlack] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_VERTICAL_TOP_ONBLACK).ToImageSkia();
    middle_images_[kImageVertical][kImageTypeOnBlack] =
        rb.GetImageNamed(
            IDR_AURA_TRAY_BG_VERTICAL_CENTER_ONBLACK).ToImageSkia();
    trailing_images_[kImageVertical][kImageTypeOnBlack] =
        rb.GetImageNamed(
            IDR_AURA_TRAY_BG_VERTICAL_BOTTOM_ONBLACK).ToImageSkia();

    leading_images_[kImageVertical][kImageTypePressed] =
        rb.GetImageNamed(IDR_AURA_TRAY_BG_VERTICAL_TOP_PRESSED).ToImageSkia();
    middle_images_[kImageVertical][kImageTypePressed] =
        rb.GetImageNamed(
            IDR_AURA_TRAY_BG_VERTICAL_CENTER_PRESSED).ToImageSkia();
    trailing_images_[kImageVertical][kImageTypePressed] =
        rb.GetImageNamed(
            IDR_AURA_TRAY_BG_VERTICAL_BOTTOM_PRESSED).ToImageSkia();
  }

  virtual ~TrayBackground() {}

  SkColor color() { return color_; }
  void set_color(SkColor color) { color_ = color; }
  void set_alpha(int alpha) { color_ = SkColorSetARGB(alpha, 0, 0, 0); }

 private:
  ShelfWidget* GetShelfWidget() const {
    return RootWindowController::ForWindow(tray_background_view_->
        status_area_widget()->GetNativeWindow())->shelf();
  }

  void PaintForAlternateShelf(gfx::Canvas* canvas, views::View* view) const {
    int orientation = kImageHorizontal;
    ShelfWidget* shelf_widget = GetShelfWidget();
    if (shelf_widget &&
        !shelf_widget->shelf_layout_manager()->IsHorizontalAlignment())
      orientation = kImageVertical;

    int state = kImageTypeDefault;
    if (tray_background_view_->IsPressed())
      state = kImageTypePressed;
    else if (shelf_widget && shelf_widget->GetDimsShelf())
      state = kImageTypeOnBlack;
    else
      state = kImageTypeDefault;

    const gfx::ImageSkia* leading = leading_images_[orientation][state];
    const gfx::ImageSkia* middle = middle_images_[orientation][state];
    const gfx::ImageSkia* trailing = trailing_images_[orientation][state];

    gfx::Rect bounds(view->GetLocalBounds());
    gfx::Point leading_location, trailing_location;
    gfx::Rect middle_bounds;

    if (orientation == kImageHorizontal) {
      leading_location = gfx::Point(0, 0);
      trailing_location = gfx::Point(bounds.width() - trailing->width(), 0);
      middle_bounds = gfx::Rect(
          leading->width(),
          0,
          bounds.width() - (leading->width() + trailing->width()),
          bounds.height());
    } else {
      leading_location = gfx::Point(0, 0);
      trailing_location = gfx::Point(0, bounds.height() - trailing->height());
      middle_bounds = gfx::Rect(
          0,
          leading->height(),
          bounds.width(),
          bounds.height() - (leading->height() + trailing->height()));
    }

    canvas->DrawImageInt(*leading,
                         leading_location.x(),
                         leading_location.y());

    canvas->DrawImageInt(*trailing,
                         trailing_location.x(),
                         trailing_location.y());

    canvas->TileImageInt(*middle,
                         middle_bounds.x(),
                         middle_bounds.y(),
                         middle_bounds.width(),
                         middle_bounds.height());
  }

  // Overridden from views::Background.
  virtual void Paint(gfx::Canvas* canvas, views::View* view) const OVERRIDE {
    if (ash::switches::UseAlternateShelfLayout()) {
      PaintForAlternateShelf(canvas, view);
    } else {
      SkPaint paint;
      paint.setAntiAlias(true);
      paint.setStyle(SkPaint::kFill_Style);
      paint.setColor(color_);
      SkPath path;
      gfx::Rect bounds(view->GetLocalBounds());
      SkScalar radius = SkIntToScalar(kTrayRoundedBorderRadius);
      path.addRoundRect(gfx::RectToSkRect(bounds), radius, radius);
      canvas->DrawPath(path, paint);
    }
  }

  SkColor color_;
  // Reference to the TrayBackgroundView for which this is a background.
  TrayBackgroundView* tray_background_view_;

  // References to the images used as backgrounds, they are owned by the
  // resource bundle class.
  const gfx::ImageSkia* leading_images_[kNumOrientations][kNumStates];
  const gfx::ImageSkia* middle_images_[kNumOrientations][kNumStates];
  const gfx::ImageSkia* trailing_images_[kNumOrientations][kNumStates];

  DISALLOW_COPY_AND_ASSIGN(TrayBackground);
};

TrayBackgroundView::TrayContainer::TrayContainer(ShelfAlignment alignment)
    : alignment_(alignment) {
  UpdateLayout();
}

void TrayBackgroundView::TrayContainer::SetAlignment(ShelfAlignment alignment) {
  if (alignment_ == alignment)
    return;
  alignment_ = alignment;
  UpdateLayout();
}

gfx::Size TrayBackgroundView::TrayContainer::GetPreferredSize() {
  if (size_.IsEmpty())
    return views::View::GetPreferredSize();
  return size_;
}

void TrayBackgroundView::TrayContainer::ChildPreferredSizeChanged(
    views::View* child) {
  PreferredSizeChanged();
}

void TrayBackgroundView::TrayContainer::ChildVisibilityChanged(View* child) {
  PreferredSizeChanged();
}

void TrayBackgroundView::TrayContainer::ViewHierarchyChanged(
    const ViewHierarchyChangedDetails& details) {
  if (details.parent == this)
    PreferredSizeChanged();
}

void TrayBackgroundView::TrayContainer::UpdateLayout() {
  // Adjust the size of status tray dark background by adding additional
  // empty border.
  if (alignment_ == SHELF_ALIGNMENT_BOTTOM ||
      alignment_ == SHELF_ALIGNMENT_TOP) {
    int vertical_padding = kTrayContainerVerticalPaddingBottomAlignment;
    int horizontal_padding = kTrayContainerHorizontalPaddingBottomAlignment;
    if (ash::switches::UseAlternateShelfLayout()) {
      vertical_padding = kPaddingFromEdgeOfShelf;
      horizontal_padding = kPaddingFromEdgeOfShelf;
    }
    set_border(views::Border::CreateEmptyBorder(
        vertical_padding,
        horizontal_padding,
        vertical_padding,
        horizontal_padding));

    views::BoxLayout* layout =
        new views::BoxLayout(views::BoxLayout::kHorizontal, 0, 0, 0);
    layout->set_spread_blank_space(true);
    views::View::SetLayoutManager(layout);
  } else {
    int vertical_padding = kTrayContainerVerticalPaddingVerticalAlignment;
    int horizontal_padding = kTrayContainerHorizontalPaddingVerticalAlignment;
    if (ash::switches::UseAlternateShelfLayout()) {
      vertical_padding = kPaddingFromEdgeOfShelf;
      horizontal_padding = kPaddingFromEdgeOfShelf;
    }
    set_border(views::Border::CreateEmptyBorder(
        vertical_padding,
        horizontal_padding,
        vertical_padding,
        horizontal_padding));

    views::BoxLayout* layout =
        new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0);
    layout->set_spread_blank_space(true);
    views::View::SetLayoutManager(layout);
  }
  PreferredSizeChanged();
}

////////////////////////////////////////////////////////////////////////////////
// TrayBackgroundView

TrayBackgroundView::TrayBackgroundView(
    internal::StatusAreaWidget* status_area_widget)
    : status_area_widget_(status_area_widget),
      tray_container_(NULL),
      shelf_alignment_(SHELF_ALIGNMENT_BOTTOM),
      background_(NULL),
      hide_background_animator_(this, 0, kTrayBackgroundAlpha),
      hover_background_animator_(
          this, 0, kTrayBackgroundHoverAlpha - kTrayBackgroundAlpha),
      hovered_(false),
      pressed_(false),
      widget_observer_(new TrayWidgetObserver(this)) {
  set_notify_enter_exit_on_child(true);

  // Initially we want to paint the background, but without the hover effect.
  SetPaintsBackground(true, internal::BackgroundAnimator::CHANGE_IMMEDIATE);
  hover_background_animator_.SetPaintsBackground(false,
      internal::BackgroundAnimator::CHANGE_IMMEDIATE);

  tray_container_ = new TrayContainer(shelf_alignment_);
  SetContents(tray_container_);
  tray_event_filter_.reset(new TrayEventFilter);
}

TrayBackgroundView::~TrayBackgroundView() {
  if (GetWidget())
    GetWidget()->RemoveObserver(widget_observer_.get());
}

void TrayBackgroundView::Initialize() {
  GetWidget()->AddObserver(widget_observer_.get());
  SetBorder();
}

const char* TrayBackgroundView::GetClassName() const {
  return kViewClassName;
}

void TrayBackgroundView::OnMouseEntered(const ui::MouseEvent& event) {
  hovered_ = true;
  if (!background_)
    return;
  if (pressed_)
    return;

  hover_background_animator_.SetPaintsBackground(true,
      internal::BackgroundAnimator::CHANGE_ANIMATE);
}

void TrayBackgroundView::OnMouseExited(const ui::MouseEvent& event) {
  hovered_ = false;
  if (!background_)
    return;
  if (pressed_)
    return;

  hover_background_animator_.SetPaintsBackground(false,
      internal::BackgroundAnimator::CHANGE_ANIMATE);
}

void TrayBackgroundView::ChildPreferredSizeChanged(views::View* child) {
  PreferredSizeChanged();
}

void TrayBackgroundView::OnPaintFocusBorder(gfx::Canvas* canvas) {
  // The tray itself expands to the right and bottom edge of the screen to make
  // sure clicking on the edges brings up the popup. However, the focus border
  // should be only around the container.
  if (HasFocus() && (focusable() || IsAccessibilityFocusable()))
    DrawBorder(canvas, GetContentsBounds());
}

void TrayBackgroundView::GetAccessibleState(ui::AccessibleViewState* state) {
  state->role = ui::AccessibilityTypes::ROLE_PUSHBUTTON;
  state->name = GetAccessibleNameForTray();
}

void TrayBackgroundView::AboutToRequestFocusFromTabTraversal(bool reverse) {
  // Return focus to the login view. See crbug.com/120500.
  views::View* v = GetNextFocusableView();
  if (v)
    v->AboutToRequestFocusFromTabTraversal(reverse);
}

bool TrayBackgroundView::PerformAction(const ui::Event& event) {
  return false;
}

void TrayBackgroundView::UpdateBackground(int alpha) {
  if (!background_)
    return;
  if (pressed_)
    return;

  background_->set_alpha(hide_background_animator_.alpha() +
                         hover_background_animator_.alpha());
  SchedulePaint();
}

void TrayBackgroundView::SetContents(views::View* contents) {
  SetLayoutManager(new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0));
  AddChildView(contents);
}

void TrayBackgroundView::SetPaintsBackground(
    bool value,
    internal::BackgroundAnimator::ChangeType change_type) {
  hide_background_animator_.SetPaintsBackground(value, change_type);
}

void TrayBackgroundView::SetContentsBackground() {
  background_ = new internal::TrayBackground(this);
  tray_container_->set_background(background_);
}

ShelfLayoutManager* TrayBackgroundView::GetShelfLayoutManager() {
  return ShelfLayoutManager::ForLauncher(GetWidget()->GetNativeView());
}

void TrayBackgroundView::SetShelfAlignment(ShelfAlignment alignment) {
  shelf_alignment_ = alignment;
  SetBorder();
  tray_container_->SetAlignment(alignment);
}

void TrayBackgroundView::SetBorder() {
  views::View* parent = status_area_widget_->status_area_widget_delegate();

  if (ash::switches::UseAlternateShelfLayout()) {
    set_border(views::Border::CreateEmptyBorder(
        0,
        0,
        ShelfLayoutManager::kAutoHideSize,
        0));
  } else {
    // Tray views are laid out right-to-left or bottom-to-top
    int on_edge = (this == parent->child_at(0));
    // Change the border padding for different shelf alignment.
    if (shelf_alignment() == SHELF_ALIGNMENT_BOTTOM) {
      set_border(views::Border::CreateEmptyBorder(
          0, 0,
          on_edge ? kPaddingFromBottomOfScreenBottomAlignment :
                    kPaddingFromBottomOfScreenBottomAlignment - 1,
          on_edge ? kPaddingFromRightEdgeOfScreenBottomAlignment : 0));
    } else if (shelf_alignment() == SHELF_ALIGNMENT_TOP) {
      set_border(views::Border::CreateEmptyBorder(
          on_edge ? kPaddingFromBottomOfScreenBottomAlignment :
                    kPaddingFromBottomOfScreenBottomAlignment - 1,
          0, 0,
          on_edge ? kPaddingFromRightEdgeOfScreenBottomAlignment : 0));
    } else if (shelf_alignment() == SHELF_ALIGNMENT_LEFT) {
      set_border(views::Border::CreateEmptyBorder(
          0, kPaddingFromOuterEdgeOfLauncherVerticalAlignment,
          on_edge ? kPaddingFromBottomOfScreenVerticalAlignment : 0,
          kPaddingFromInnerEdgeOfLauncherVerticalAlignment));
    } else {
      set_border(views::Border::CreateEmptyBorder(
          0, kPaddingFromInnerEdgeOfLauncherVerticalAlignment,
          on_edge ? kPaddingFromBottomOfScreenVerticalAlignment : 0,
          kPaddingFromOuterEdgeOfLauncherVerticalAlignment));
    }
  }
}

void TrayBackgroundView::InitializeBubbleAnimations(
    views::Widget* bubble_widget) {
  views::corewm::SetWindowVisibilityAnimationType(
      bubble_widget->GetNativeWindow(),
      views::corewm::WINDOW_VISIBILITY_ANIMATION_TYPE_FADE);
  views::corewm::SetWindowVisibilityAnimationTransition(
      bubble_widget->GetNativeWindow(),
      views::corewm::ANIMATE_HIDE);
  views::corewm::SetWindowVisibilityAnimationDuration(
      bubble_widget->GetNativeWindow(),
      base::TimeDelta::FromMilliseconds(kAnimationDurationForPopupMS));
}

bool TrayBackgroundView::IsPressed() {
  return pressed_;
}

aura::Window* TrayBackgroundView::GetBubbleWindowContainer() const {
  return ash::Shell::GetContainer(
      tray_container()->GetWidget()->GetNativeWindow()->GetRootWindow(),
      ash::internal::kShellWindowId_SettingBubbleContainer);
}

gfx::Rect TrayBackgroundView::GetBubbleAnchorRect(
    views::Widget* anchor_widget,
    TrayBubbleView::AnchorType anchor_type,
    TrayBubbleView::AnchorAlignment anchor_alignment) const {
  gfx::Rect rect;
  if (anchor_widget && anchor_widget->IsVisible()) {
    rect = anchor_widget->GetWindowBoundsInScreen();
    if (anchor_type == TrayBubbleView::ANCHOR_TYPE_TRAY) {
      if (anchor_alignment == TrayBubbleView::ANCHOR_ALIGNMENT_BOTTOM) {
        bool rtl = base::i18n::IsRTL();
        rect.Inset(
            rtl ? kPaddingFromRightEdgeOfScreenBottomAlignment : 0,
            kTrayBubbleAnchorTopInsetBottomAnchor,
            rtl ? 0 : kPaddingFromRightEdgeOfScreenBottomAlignment,
            kPaddingFromBottomOfScreenBottomAlignment);
      } else if (anchor_alignment == TrayBubbleView::ANCHOR_ALIGNMENT_LEFT) {
        rect.Inset(0, 0, kPaddingFromInnerEdgeOfLauncherVerticalAlignment + 5,
                   kPaddingFromBottomOfScreenVerticalAlignment);
      } else {
        rect.Inset(kPaddingFromInnerEdgeOfLauncherVerticalAlignment + 1,
                   0, 0, kPaddingFromBottomOfScreenVerticalAlignment);
      }
    } else if (anchor_type == TrayBubbleView::ANCHOR_TYPE_BUBBLE) {
      // Invert the offsets to align with the bubble below.
      // Note that with the alternate shelf layout the tips are not shown and
      // the offsets for left and right alignment do not need to be applied.
      int vertical_alignment = ash::switches::UseAlternateShelfLayout() ?
          0 : kPaddingFromInnerEdgeOfLauncherVerticalAlignment;
      if (anchor_alignment == TrayBubbleView::ANCHOR_ALIGNMENT_LEFT) {
        rect.Inset(vertical_alignment,
                   0, 0, kPaddingFromBottomOfScreenVerticalAlignment);
      } else if (anchor_alignment == TrayBubbleView::ANCHOR_ALIGNMENT_RIGHT) {
        rect.Inset(0, 0, vertical_alignment,
                   kPaddingFromBottomOfScreenVerticalAlignment);
      }
    }
  }

  // TODO(jennyz): May need to add left/right alignment in the following code.
  if (rect.IsEmpty()) {
    aura::RootWindow* target_root = anchor_widget ?
        anchor_widget->GetNativeView()->GetRootWindow() :
        Shell::GetPrimaryRootWindow();
    rect = target_root->bounds();
    rect = gfx::Rect(
        base::i18n::IsRTL() ? kPaddingFromRightEdgeOfScreenBottomAlignment :
        rect.width() - kPaddingFromRightEdgeOfScreenBottomAlignment,
        rect.height() - kPaddingFromBottomOfScreenBottomAlignment,
        0, 0);
    rect = ScreenAsh::ConvertRectToScreen(target_root, rect);
  }
  return rect;
}

TrayBubbleView::AnchorAlignment TrayBackgroundView::GetAnchorAlignment() const {
  switch (shelf_alignment_) {
    case SHELF_ALIGNMENT_BOTTOM:
      return TrayBubbleView::ANCHOR_ALIGNMENT_BOTTOM;
    case SHELF_ALIGNMENT_LEFT:
      return TrayBubbleView::ANCHOR_ALIGNMENT_LEFT;
    case SHELF_ALIGNMENT_RIGHT:
      return TrayBubbleView::ANCHOR_ALIGNMENT_RIGHT;
    case SHELF_ALIGNMENT_TOP:
      return TrayBubbleView::ANCHOR_ALIGNMENT_TOP;
  }
  NOTREACHED();
  return TrayBubbleView::ANCHOR_ALIGNMENT_BOTTOM;
}

void TrayBackgroundView::SetBubbleVisible(bool visible) {
  pressed_ = visible;
  if (!background_)
    return;

  // Do not change gradually, changing color between grey and blue is weird.
  if (pressed_)
    background_->set_color(kTrayBackgroundPressedColor);
  else if (hovered_)
    background_->set_alpha(kTrayBackgroundHoverAlpha);
  else
    background_->set_alpha(kTrayBackgroundAlpha);
  SchedulePaint();
}

void TrayBackgroundView::UpdateBubbleViewArrow(
    views::TrayBubbleView* bubble_view) {
  if (switches::UseAlternateShelfLayout())
    return;

  aura::RootWindow* root_window =
      bubble_view->GetWidget()->GetNativeView()->GetRootWindow();
  ash::internal::ShelfLayoutManager* shelf =
      ShelfLayoutManager::ForLauncher(root_window);
  bubble_view->SetArrowPaintType(
      shelf->IsVisible() ? views::BubbleBorder::PAINT_NORMAL :
                           views::BubbleBorder::PAINT_TRANSPARENT);
}

}  // namespace internal
}  // namespace ash