Fork a subset of ash/shelf for use in mash.

mash/shelf/shelf_view.cc

 // Copyright 2015 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 "mash/shelf/shelf_view.h"
 
-#include "base/strings/stringprintf.h"
-#include "base/strings/utf_string_conversions.h"
-#include "mojo/common/common_type_converters.h"
-#include "mojo/shell/public/cpp/application_impl.h"
+#include <algorithm>
+
+#include "base/auto_reset.h"
+#include "mash/shelf/shelf_button.h"
+#include "mash/shelf/shelf_constants.h"
+#include "ui/accessibility/ax_view_state.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_event_dispatcher.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/models/simple_menu_model.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/compositor/layer.h"
+#include "ui/compositor/layer_animator.h"
+#include "ui/compositor/scoped_animation_duration_scale_mode.h"
+#include "ui/events/event_utils.h"
 #include "ui/gfx/canvas.h"
+#include "ui/gfx/geometry/point.h"
+#include "ui/resources/grit/ui_resources.h"
+#include "ui/views/animation/bounds_animator.h"
+#include "ui/views/background.h"
+#include "ui/views/border.h"
+#include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/button/label_button.h"
-#include "ui/views/layout/box_layout.h"
+#include "ui/views/controls/menu/menu_model_adapter.h"
+#include "ui/views/controls/menu/menu_runner.h"
+#include "ui/views/focus/focus_search.h"
+#include "ui/views/view_model_utils.h"
+#include "ui/views/widget/widget.h"
+#include "ui/wm/core/coordinate_conversion.h"
 
 namespace mash {
 namespace shelf {
 
-ShelfView::ShelfView(mojo::ApplicationImpl* app) : binding_(this) {
-  app->ConnectToService("mojo:desktop_wm", &user_window_controller_);
-
-  user_window_controller_->AddUserWindowObserver(
-      binding_.CreateInterfacePtrAndBind());
-
-  SetLayoutManager(
-      new views::BoxLayout(views::BoxLayout::kHorizontal, 0, 0, 0));
-}
-
-ShelfView::~ShelfView() {}
-
-size_t ShelfView::GetButtonIndexById(uint32_t window_id) const {
-  for (size_t i = 0; i < open_window_buttons_.size(); ++i)
-    if (static_cast<uint32_t>(open_window_buttons_[i]->tag()) == window_id)
-      return i;
-  return open_window_buttons_.size();
-}
-
-void ShelfView::OnPaint(gfx::Canvas* canvas) {
-  canvas->FillRect(GetLocalBounds(), SK_ColorYELLOW);

[bungeman-skia, 2016/01/27 19:59:48]

Was already implicitly using a Skia header here?

[msw, 2016/01/27 20:21:50]

Yup! Looks like it's a public deps of ui/gfx, and transitive includes allowed
use of this color constant with an explicit include or DEPS addition.

-  views::View::OnPaint(canvas);
+const int SHELF_ALIGNMENT_UMA_ENUM_VALUE_BOTTOM = 0;
+const int SHELF_ALIGNMENT_UMA_ENUM_VALUE_LEFT = 1;
+const int SHELF_ALIGNMENT_UMA_ENUM_VALUE_RIGHT = 2;
+const int SHELF_ALIGNMENT_UMA_ENUM_VALUE_COUNT = 3;
+
+// Default amount content is inset on the left edge.
+const int kDefaultLeadingInset = 8;
+
+// Minimum distance before drag starts.
+const int kMinimumDragDistance = 8;
+
+// The proportion of the shelf space reserved for non-panel icons. Panels
+// may flow into this space but will be put into the overflow bubble if there
+// is contention for the space.
+const float kReservedNonPanelIconProportion = 0.67f;
+
+// The distance of the cursor from the outer rim of the shelf before it
+// separates.
+const int kRipOffDistance = 48;
+
+// The rip off drag and drop proxy image should get scaled by this factor.
+const float kDragAndDropProxyScale = 1.5f;
+
+// The opacity represents that this partially disappeared item will get removed.
+const float kDraggedImageOpacity = 0.5f;
+
+namespace {
+
+// A class to temporarily disable a given bounds animator.
+class BoundsAnimatorDisabler {
+ public:
+  explicit BoundsAnimatorDisabler(views::BoundsAnimator* bounds_animator)
+      : old_duration_(bounds_animator->GetAnimationDuration()),
+        bounds_animator_(bounds_animator) {
+    bounds_animator_->SetAnimationDuration(1);
+  }
+
+  ~BoundsAnimatorDisabler() {
+    bounds_animator_->SetAnimationDuration(old_duration_);
+  }
+
+ private:
+  // The previous animation duration.
+  int old_duration_;
+  // The bounds animator which gets used.
+  views::BoundsAnimator* bounds_animator_;
+
+  DISALLOW_COPY_AND_ASSIGN(BoundsAnimatorDisabler);
+};
+
+// Custom FocusSearch used to navigate the shelf in the order items are in
+// the ViewModel.
+class ShelfFocusSearch : public views::FocusSearch {
+ public:
+  explicit ShelfFocusSearch(views::ViewModel* view_model)
+      : FocusSearch(nullptr, true, true),
+        view_model_(view_model) {}
+  ~ShelfFocusSearch() override {}
+
+  // views::FocusSearch overrides:
+  views::View* FindNextFocusableView(
+      views::View* starting_view,
+      bool reverse,
+      Direction direction,
+      bool check_starting_view,
+      views::FocusTraversable** focus_traversable,
+      views::View** focus_traversable_view) override {
+    int index = view_model_->GetIndexOfView(starting_view);
+    if (index == -1)
+      return view_model_->view_at(0);
+
+    if (reverse) {
+      --index;
+      if (index < 0)
+        index = view_model_->view_size() - 1;
+    } else {
+      ++index;
+      if (index >= view_model_->view_size())
+        index = 0;
+    }
+    return view_model_->view_at(index);
+  }
+
+ private:
+  views::ViewModel* view_model_;
+
+  DISALLOW_COPY_AND_ASSIGN(ShelfFocusSearch);
+};
+
+// AnimationDelegate used when inserting a new item. This steadily increases the
+// opacity of the layer as the animation progress.
+class FadeInAnimationDelegate : public gfx::AnimationDelegate {
+ public:
+  explicit FadeInAnimationDelegate(views::View* view) : view_(view) {}
+  ~FadeInAnimationDelegate() override {}
+
+  // AnimationDelegate overrides:
+  void AnimationProgressed(const gfx::Animation* animation) override {
+    view_->layer()->SetOpacity(animation->GetCurrentValue());
+    view_->layer()->ScheduleDraw();
+  }
+  void AnimationEnded(const gfx::Animation* animation) override {
+    view_->layer()->SetOpacity(1.0f);
+    view_->layer()->ScheduleDraw();
+  }
+  void AnimationCanceled(const gfx::Animation* animation) override {
+    view_->layer()->SetOpacity(1.0f);
+    view_->layer()->ScheduleDraw();
+  }
+
+ private:
+  views::View* view_;
+
+  DISALLOW_COPY_AND_ASSIGN(FadeInAnimationDelegate);
+};
+
+void ReflectItemStatus(const ShelfItem& item, ShelfButton* button) {
+  switch (item.status) {
+    case STATUS_CLOSED:
+      button->ClearState(ShelfButton::STATE_ACTIVE);
+      button->ClearState(ShelfButton::STATE_RUNNING);
+      button->ClearState(ShelfButton::STATE_ATTENTION);
+      break;
+    case STATUS_RUNNING:
+      button->ClearState(ShelfButton::STATE_ACTIVE);
+      button->AddState(ShelfButton::STATE_RUNNING);
+      button->ClearState(ShelfButton::STATE_ATTENTION);
+      break;
+    case STATUS_ACTIVE:
+      button->AddState(ShelfButton::STATE_ACTIVE);
+      button->ClearState(ShelfButton::STATE_RUNNING);
+      button->ClearState(ShelfButton::STATE_ATTENTION);
+      break;
+    case STATUS_ATTENTION:
+      button->ClearState(ShelfButton::STATE_ACTIVE);
+      button->ClearState(ShelfButton::STATE_RUNNING);
+      button->AddState(ShelfButton::STATE_ATTENTION);
+      break;
+  }
+}
+
+}  // namespace
+
+// AnimationDelegate used when deleting an item. This steadily decreased the
+// opacity of the layer as the animation progress.
+class ShelfView::FadeOutAnimationDelegate : public gfx::AnimationDelegate {
+ public:
+  FadeOutAnimationDelegate(ShelfView* host, views::View* view)
+      : shelf_view_(host),
+        view_(view) {}
+  ~FadeOutAnimationDelegate() override {}
+
+  // AnimationDelegate overrides:
+  void AnimationProgressed(const gfx::Animation* animation) override {
+    view_->layer()->SetOpacity(1 - animation->GetCurrentValue());
+    view_->layer()->ScheduleDraw();
+  }
+  void AnimationEnded(const gfx::Animation* animation) override {
+    shelf_view_->OnFadeOutAnimationEnded();
+  }
+  void AnimationCanceled(const gfx::Animation* animation) override {}
+
+ private:
+  ShelfView* shelf_view_;
+  scoped_ptr<views::View> view_;
+
+  DISALLOW_COPY_AND_ASSIGN(FadeOutAnimationDelegate);
+};
+
+// AnimationDelegate used to trigger fading an element in. When an item is
+// inserted this delegate is attached to the animation that expands the size of
+// the item.  When done it kicks off another animation to fade the item in.
+class ShelfView::StartFadeAnimationDelegate : public gfx::AnimationDelegate {
+ public:
+  StartFadeAnimationDelegate(ShelfView* host, views::View* view)
+      : shelf_view_(host),
+        view_(view) {}
+  ~StartFadeAnimationDelegate() override {}
+
+  // AnimationDelegate overrides:
+  void AnimationEnded(const gfx::Animation* animation) override {
+    shelf_view_->FadeIn(view_);
+  }
+  void AnimationCanceled(const gfx::Animation* animation) override {
+    view_->layer()->SetOpacity(1.0f);
+  }
+
+ private:
+  ShelfView* shelf_view_;
+  views::View* view_;
+
+  DISALLOW_COPY_AND_ASSIGN(StartFadeAnimationDelegate);
+};
+
+ShelfView::ShelfView(mojo::ApplicationImpl* app)
+    : app_(app),
+      model_(app),
+      alignment_(SHELF_ALIGNMENT_BOTTOM),
+      first_visible_index_(0),
+      last_visible_index_(-1),
+      /* TODO(msw): Restore functionality:
+      overflow_button_(nullptr),
+      owner_overflow_bubble_(nullptr),*/
+      tooltip_(this),
+      drag_pointer_(NONE),
+      drag_view_(nullptr),
+      start_drag_index_(-1),
+      context_menu_id_(0),
+      leading_inset_(kDefaultLeadingInset),
+      cancelling_drag_model_changed_(false),
+      last_hidden_index_(0),
+      closing_event_time_(),
+      got_deleted_(nullptr),
+      drag_and_drop_item_pinned_(false),
+      drag_and_drop_shelf_id_(0),
+      drag_replaced_view_(nullptr),
+      dragged_off_shelf_(false),
+      snap_back_from_rip_off_view_(nullptr),
+      /* TODO(msw): Restore functionality:
+      item_manager_(Shell::GetInstance()->shelf_item_delegate_manager()),*/
+      overflow_mode_(false),
+      main_shelf_(nullptr),
+      dragged_off_from_overflow_to_shelf_(false),
+      is_repost_event_(false),
+      last_pressed_index_(-1) {
+  bounds_animator_.reset(new views::BoundsAnimator(this));
+  bounds_animator_->AddObserver(this);
+  set_context_menu_controller(this);
+  focus_search_.reset(new ShelfFocusSearch(&view_model_));
+
+  model_.AddObserver(this);
+  const ShelfItems& items(model_.items());
+  for (ShelfItems::const_iterator i = items.begin(); i != items.end(); ++i) {
+    views::View* child = CreateViewForItem(*i);
+    view_model_.Add(child, static_cast<int>(i - items.begin()));
+    AddChildView(child);
+  }
+
+  /* TODO(msw): Restore functionality:
+  overflow_button_ = new OverflowButton(this);
+  overflow_button_->set_context_menu_controller(this);
+  ConfigureChildView(overflow_button_);
+  AddChildView(overflow_button_);*/
+
+  /* TODO(msw): Add a stub apps button?
+  ShelfItem app_list;
+  app_list.type = TYPE_APP_LIST;
+  app_list.title = base::ASCIIToUTF16("APPS");
+  model()->Add(app_list);*/
+
+  // TODO(msw): Needed to paint children as layers???
+  SetPaintToLayer(true);
+  set_background(views::Background::CreateSolidBackground(SK_ColorYELLOW));
+
+  // We'll layout when our bounds change.
+}
+
+ShelfView::~ShelfView() {
+  bounds_animator_->RemoveObserver(this);
+  model_.RemoveObserver(this);
+  // If we are inside the MenuRunner, we need to know if we were getting
+  // deleted while it was running.
+  if (got_deleted_)
+    *got_deleted_ = true;
+}
+
+void ShelfView::SetAlignment(ShelfAlignment alignment) {
+  if (alignment_ == alignment)
+    return;
+
+  alignment_ = alignment;
+  /* TODO(msw): Restore functionality:
+  overflow_button_->OnShelfAlignmentChanged();*/
+  LayoutToIdealBounds();
+  for (int i = 0; i < view_model_.view_size(); ++i) {
+    if (i >= first_visible_index_ && i <= last_visible_index_)
+      view_model_.view_at(i)->Layout();
+  }
+  tooltip_.Close();
+  /* TODO(msw): Restore functionality:
+  if (overflow_bubble_)
+    overflow_bubble_->Hide();*/
+}
+
+void ShelfView::SchedulePaintForAllButtons() {
+  for (int i = 0; i < view_model_.view_size(); ++i) {
+    if (i >= first_visible_index_ && i <= last_visible_index_)
+      view_model_.view_at(i)->SchedulePaint();
+  }
+  /* TODO(msw): Restore functionality:
+  if (overflow_button_ && overflow_button_->visible())
+    overflow_button_->SchedulePaint();*/
+}
+
+gfx::Rect ShelfView::GetIdealBoundsOfItemIcon(ShelfID id) {
+  int index = model_.ItemIndexByID(id);
+  if (index == -1)
+    return gfx::Rect();
+  // Map all items from overflow area to the overflow button. Note that the
+  // section between last_index_hidden_ and model_.FirstPanelIndex() is the
+  // list of invisible panel items. However, these items are currently nowhere
+  // represented and get dropped instead - see (crbug.com/378907). As such there
+  // is no way to address them or place them. We therefore move them over the
+  // overflow button.
+  if (index > last_visible_index_ && index < model_.FirstPanelIndex())
+    index = last_visible_index_ + 1;
+  const gfx::Rect& ideal_bounds(view_model_.ideal_bounds(index));
+  DCHECK_NE(TYPE_APP_LIST, model_.items()[index].type);
+  views::View* view = view_model_.view_at(index);
+  CHECK_EQ(ShelfButton::kViewClassName, view->GetClassName());
+  ShelfButton* button = static_cast<ShelfButton*>(view);
+  gfx::Rect icon_bounds = button->GetIconBounds();
+  return gfx::Rect(GetMirroredXWithWidthInView(
+                       ideal_bounds.x() + icon_bounds.x(), icon_bounds.width()),
+                   ideal_bounds.y() + icon_bounds.y(),
+                   icon_bounds.width(),
+                   icon_bounds.height());
+}
+
+void ShelfView::UpdatePanelIconPosition(ShelfID id,
+                                        const gfx::Point& midpoint) {
+  int current_index = model_.ItemIndexByID(id);
+  int first_panel_index = model_.FirstPanelIndex();
+  if (current_index < first_panel_index)
+    return;
+
+  gfx::Point midpoint_in_view(GetMirroredXInView(midpoint.x()),
+                              midpoint.y());
+  int target_index = current_index;
+  while (target_index > first_panel_index &&
+         PrimaryAxisValue(view_model_.ideal_bounds(target_index).x(),
+                          view_model_.ideal_bounds(target_index).y()) >
+         PrimaryAxisValue(midpoint_in_view.x(),
+                          midpoint_in_view.y())) {
+    --target_index;
+  }
+  while (target_index < view_model_.view_size() - 1 &&
+         PrimaryAxisValue(view_model_.ideal_bounds(target_index).right(),
+                          view_model_.ideal_bounds(target_index).bottom()) <
+         PrimaryAxisValue(midpoint_in_view.x(),
+                          midpoint_in_view.y())) {
+    ++target_index;
+  }
+  if (current_index != target_index)
+    model_.Move(current_index, target_index);
+}
+
+bool ShelfView::IsShowingMenu() const {
+  return (launcher_menu_runner_.get() &&
+       launcher_menu_runner_->IsRunning());
+}
+
+bool ShelfView::IsShowingOverflowBubble() const {
+  /* TODO(msw): Restore functionality:
+  return overflow_bubble_.get() && overflow_bubble_->IsShowing();*/
+  return false;
+}
+
+views::View* ShelfView::GetAppListButtonView() const {
+  for (int i = 0; i < model_.item_count(); ++i) {
+    if (model_.items()[i].type == TYPE_APP_LIST)
+      return view_model_.view_at(i);
+  }
+
+  NOTREACHED() << "Applist button not found";
+  return nullptr;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ShelfView, FocusTraversable implementation:
+
+views::FocusSearch* ShelfView::GetFocusSearch() {
+  return focus_search_.get();
+}
+
+views::FocusTraversable* ShelfView::GetFocusTraversableParent() {
+  return parent()->GetFocusTraversable();
+}
+
+views::View* ShelfView::GetFocusTraversableParentView() {
+  return this;
+}
+
+/* TODO(msw): Restore drag/drop functionality.
+void ShelfView::CreateDragIconProxy(
+    const gfx::Point& location_in_screen_coordinates,
+    const gfx::ImageSkia& icon,
+    views::View* replaced_view,
+    const gfx::Vector2d& cursor_offset_from_center,
+    float scale_factor) {
+  drag_replaced_view_ = replaced_view;
+  drag_image_.reset(new ash::DragImageView(
+      drag_replaced_view_->GetWidget()->GetNativeWindow()->GetRootWindow(),
+      ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE));
+  drag_image_->SetImage(icon);
+  gfx::Size size = drag_image_->GetPreferredSize();
+  size.set_width(size.width() * scale_factor);
+  size.set_height(size.height() * scale_factor);
+  drag_image_offset_ = gfx::Vector2d(size.width() / 2, size.height() / 2) +
+                       cursor_offset_from_center;
+  gfx::Rect drag_image_bounds(
+      location_in_screen_coordinates - drag_image_offset_,
+      size);
+  drag_image_->SetBoundsInScreen(drag_image_bounds);
+  drag_image_->SetWidgetVisible(true);
+}
+
+void ShelfView::UpdateDragIconProxy(
+    const gfx::Point& location_in_screen_coordinates) {
+  // TODO(jennyz): Investigate why drag_image_ becomes NULL at this point per
+  // crbug.com/34722, while the app list item is still being dragged around.
+  if (drag_image_) {
+    drag_image_->SetScreenPosition(
+        location_in_screen_coordinates - drag_image_offset_);
+  }
+}
+
+void ShelfView::DestroyDragIconProxy() {
+  drag_image_.reset();
+  drag_image_offset_ = gfx::Vector2d(0, 0);
+}
+
+bool ShelfView::StartDrag(const std::string& app_id,
+                          const gfx::Point& location_in_screen_coordinates) {
+  // Bail if an operation is already going on - or the cursor is not inside.
+  // This could happen if mouse / touch operations overlap.
+  if (drag_and_drop_shelf_id_ ||
+      !GetBoundsInScreen().Contains(location_in_screen_coordinates))
+    return false;
+
+  // If the AppsGridView (which was dispatching this event) was opened by our
+  // button, ShelfView dragging operations are locked and we have to unlock.
+  CancelDrag(-1);
+  drag_and_drop_item_pinned_ = false;
+  drag_and_drop_app_id_ = app_id;
+  drag_and_drop_shelf_id_ =
+      delegate_->GetShelfIDForAppID(drag_and_drop_app_id_);
+  // Check if the application is known and pinned - if not, we have to pin it so
+  // that we can re-arrange the shelf order accordingly. Note that items have
+  // to be pinned to give them the same (order) possibilities as a shortcut.
+  // When an item is dragged from overflow to shelf, IsShowingOverflowBubble()
+  // returns true. At this time, we don't need to pin the item.
+  if (!IsShowingOverflowBubble() &&
+      (!drag_and_drop_shelf_id_ ||
+       !delegate_->IsAppPinned(app_id))) {
+    delegate_->PinAppWithID(app_id);
+    drag_and_drop_shelf_id_ =
+        delegate_->GetShelfIDForAppID(drag_and_drop_app_id_);
+    if (!drag_and_drop_shelf_id_)
+      return false;
+    drag_and_drop_item_pinned_ = true;
+  }
+  views::View* drag_and_drop_view = view_model_->view_at(
+      model_.ItemIndexByID(drag_and_drop_shelf_id_));
+  DCHECK(drag_and_drop_view);
+
+  // Since there is already an icon presented by the caller, we hide this item
+  // for now. That has to be done by reducing the size since the visibility will
+  // change once a regrouping animation is performed.
+  pre_drag_and_drop_size_ = drag_and_drop_view->size();
+  drag_and_drop_view->SetSize(gfx::Size());
+
+  // First we have to center the mouse cursor over the item.
+  gfx::Point pt = drag_and_drop_view->GetBoundsInScreen().CenterPoint();
+  views::View::ConvertPointFromScreen(drag_and_drop_view, &pt);
+  gfx::Point point_in_root = location_in_screen_coordinates;
+  ::wm::ConvertPointFromScreen(
+      ash::wm::GetRootWindowAt(location_in_screen_coordinates), &point_in_root);
+  ui::MouseEvent event(ui::ET_MOUSE_PRESSED, pt, point_in_root,
+                       ui::EventTimeForNow(), 0, 0);
+  PointerPressedOnButton(drag_and_drop_view,
+                         ShelfButtonHost::DRAG_AND_DROP,
+                         event);
+
+  // Drag the item where it really belongs.
+  Drag(location_in_screen_coordinates);
+  return true;
+}
+
+bool ShelfView::Drag(const gfx::Point& location_in_screen_coordinates) {
+  if (!drag_and_drop_shelf_id_ ||
+      !GetBoundsInScreen().Contains(location_in_screen_coordinates))
+    return false;
+
+  gfx::Point pt = location_in_screen_coordinates;
+  views::View* drag_and_drop_view = view_model_->view_at(
+      model_.ItemIndexByID(drag_and_drop_shelf_id_));
+  ConvertPointFromScreen(drag_and_drop_view, &pt);
+  gfx::Point point_in_root = location_in_screen_coordinates;
+  ::wm::ConvertPointFromScreen(
+      ash::wm::GetRootWindowAt(location_in_screen_coordinates), &point_in_root);
+  ui::MouseEvent event(ui::ET_MOUSE_DRAGGED, pt, point_in_root,
+                       ui::EventTimeForNow(), 0, 0);
+  PointerDraggedOnButton(drag_and_drop_view,
+                         ShelfButtonHost::DRAG_AND_DROP,
+                         event);
+  return true;
+}
+
+void ShelfView::EndDrag(bool cancel) {
+  if (!drag_and_drop_shelf_id_)
+    return;
+
+  views::View* drag_and_drop_view = view_model_->view_at(
+      model_.ItemIndexByID(drag_and_drop_shelf_id_));
+  PointerReleasedOnButton(
+      drag_and_drop_view, ShelfButtonHost::DRAG_AND_DROP, cancel);
+
+  // Either destroy the temporarily created item - or - make the item visible.
+  if (drag_and_drop_item_pinned_ && cancel) {
+    delegate_->UnpinAppWithID(drag_and_drop_app_id_);
+  } else if (drag_and_drop_view) {
+    if (cancel) {
+      // When a hosted drag gets canceled, the item can remain in the same slot
+      // and it might have moved within the bounds. In that case the item need
+      // to animate back to its correct location.
+      AnimateToIdealBounds();
+    } else {
+      drag_and_drop_view->SetSize(pre_drag_and_drop_size_);
+    }
+  }
+
+  drag_and_drop_shelf_id_ = 0;
+}*/
+
+void ShelfView::LayoutToIdealBounds() {
+  if (bounds_animator_->IsAnimating()) {
+    AnimateToIdealBounds();
+    return;
+  }
+
+  CalculateIdealBounds();
+  /* TODO(msw): Restore functionality:
+  gfx::Rect overflow_bounds = CalculateIdealBounds();*/
+  views::ViewModelUtils::SetViewBoundsToIdealBounds(view_model_);
+  /* TODO(msw): Restore functionality:
+  overflow_button_->SetBoundsRect(overflow_bounds);*/
+}
+
+void ShelfView::UpdateAllButtonsVisibilityInOverflowMode() {
+  // The overflow button is not shown in overflow mode.
+  /* TODO(msw): Restore functionality:
+  overflow_button_->SetVisible(false);*/
+  DCHECK_LT(last_visible_index_, view_model_.view_size());
+  for (int i = 0; i < view_model_.view_size(); ++i) {
+    bool visible = i >= first_visible_index_ &&
+        i <= last_visible_index_;
+    // To track the dragging of |drag_view_| continuously, its visibility
+    // should be always true regardless of its position.
+    if (dragged_off_from_overflow_to_shelf_ &&
+        view_model_.view_at(i) == drag_view_)
+      view_model_.view_at(i)->SetVisible(true);
+    else
+      view_model_.view_at(i)->SetVisible(visible);
+  }
+}
+
+gfx::Rect ShelfView::CalculateIdealBounds() {
+  int available_size = PrimaryAxisValue(width(), height());
+  DCHECK_EQ(model_.item_count(), view_model_.view_size());
+  if (!available_size || model_.items().empty())
+    return gfx::Rect();
+
+  int x = 0;
+  int y = 0;
+  int button_size = kShelfButtonSize;
+  int button_spacing = kShelfButtonSpacing;
+
+  int w = PrimaryAxisValue(button_size, width());
+  int h = PrimaryAxisValue(height(), button_size);
+  for (int i = 0; i < view_model_.view_size(); ++i) {
+    if (i < first_visible_index_) {
+      view_model_.set_ideal_bounds(i, gfx::Rect(x, y, 0, 0));
+      continue;
+    }
+
+    view_model_.set_ideal_bounds(i, gfx::Rect(x, y, w, h));
+    x = PrimaryAxisValue(x + w + button_spacing, x);
+    y = PrimaryAxisValue(y, y + h + button_spacing);
+  }
+
+  if (is_overflow_mode()) {
+    UpdateAllButtonsVisibilityInOverflowMode();
+    return gfx::Rect();
+  }
+
+  // Right aligned icons.
+  int end_position = available_size - button_spacing;
+  x = PrimaryAxisValue(end_position, 0);
+  y = PrimaryAxisValue(0, end_position);
+  int first_panel_index = model_.FirstPanelIndex();
+  for (int i = view_model_.view_size() - 1; i >= first_panel_index; --i) {
+    x = PrimaryAxisValue(x - w - button_spacing, x);
+    y = PrimaryAxisValue(y, y - h - button_spacing);
+    view_model_.set_ideal_bounds(i, gfx::Rect(x, y, w, h));
+    end_position = PrimaryAxisValue(x, y);
+  }
+
+  int last_button_index = first_panel_index - 1;
+  if (last_button_index < 0)
+    return gfx::Rect();
+
+  // Icons on the left / top are guaranteed up to kLeftIconProportion of
+  // the available space.
+  int last_icon_position = PrimaryAxisValue(
+      view_model_.ideal_bounds(last_button_index).right(),
+      view_model_.ideal_bounds(last_button_index).bottom()) + button_size;
+  int reserved_icon_space = available_size * kReservedNonPanelIconProportion;
+  if (last_icon_position < reserved_icon_space)
+    end_position = last_icon_position;
+  else
+    end_position = std::max(end_position, reserved_icon_space);
+
+  gfx::Rect overflow_bounds(PrimaryAxisValue(w, width()),
+                            PrimaryAxisValue(height(), h));
+
+  last_visible_index_ = DetermineLastVisibleIndex(end_position - button_size);
+  last_hidden_index_ = DetermineFirstVisiblePanelIndex(end_position) - 1;
+  bool show_overflow = last_visible_index_ < last_button_index ||
+      last_hidden_index_ >= first_panel_index;
+
+  // Create Space for the overflow button
+  if (show_overflow) {
+    // The following code makes sure that platform apps icons (aligned to left /
+    // top) are favored over panel apps icons (aligned to right / bottom).
+    if (last_visible_index_ > 0 && last_visible_index_ < last_button_index) {
+      // This condition means that we will take one platform app and replace it
+      // with the overflow button and put the app in the overflow bubble.
+      // This happens when the space needed for platform apps exceeds the
+      // reserved area for non-panel icons,
+      // (i.e. |last_icon_position| > |reserved_icon_space|).
+      --last_visible_index_;
+    } else if (last_hidden_index_ >= first_panel_index &&
+               last_hidden_index_ < view_model_.view_size() - 1) {
+      // This condition means that we will take a panel app icon and replace it
+      // with the overflow button.
+      // This happens when there is still room for platform apps in the reserved
+      // area for non-panel icons,
+      // (i.e. |last_icon_position| < |reserved_icon_space|).
+      ++last_hidden_index_;
+    }
+  }
+
+  for (int i = 0; i < view_model_.view_size(); ++i) {
+    bool visible = i <= last_visible_index_ || i > last_hidden_index_;
+    // To receive drag event continuously from |drag_view_| during the dragging
+    // off from the shelf, don't make |drag_view_| invisible. It will be
+    // eventually invisible and removed from the |view_model_| by
+    // FinalizeRipOffDrag().
+    if (dragged_off_shelf_ && view_model_.view_at(i) == drag_view_)
+      continue;
+    view_model_.view_at(i)->SetVisible(visible);
+  }
+
+  /* TODO(msw): Restore functionality:
+  overflow_button_->SetVisible(show_overflow);*/
+  if (show_overflow) {
+    DCHECK_NE(0, view_model_.view_size());
+    if (last_visible_index_ == -1) {
+      x = 0;
+      y = 0;
+    } else {
+      x = PrimaryAxisValue(
+          view_model_.ideal_bounds(last_visible_index_).right(),
+          view_model_.ideal_bounds(last_visible_index_).x());
+      y = PrimaryAxisValue(
+          view_model_.ideal_bounds(last_visible_index_).y(),
+          view_model_.ideal_bounds(last_visible_index_).bottom());
+    }
+    // Set all hidden panel icon positions to be on the overflow button.
+    for (int i = first_panel_index; i <= last_hidden_index_; ++i)
+      view_model_.set_ideal_bounds(i, gfx::Rect(x, y, w, h));
+
+    // Add more space between last visible item and overflow button.
+    // Without this, two buttons look too close compared with other items.
+    x = PrimaryAxisValue(x + button_spacing, x);
+    y = PrimaryAxisValue(y, y + button_spacing);
+
+    overflow_bounds.set_x(x);
+    overflow_bounds.set_y(y);
+    /* TODO(msw): Restore functionality:
+    if (overflow_bubble_.get() && overflow_bubble_->IsShowing())
+      UpdateOverflowRange(overflow_bubble_->shelf_view());*/
+  } else {
+    /* TODO(msw): Restore functionality:
+    if (overflow_bubble_)
+      overflow_bubble_->Hide();*/
+  }
+  return overflow_bounds;
+}
+
+int ShelfView::DetermineLastVisibleIndex(int max_value) const {
+  int index = model_.FirstPanelIndex() - 1;
+  while (index >= 0 &&
+         PrimaryAxisValue(
+             view_model_.ideal_bounds(index).right(),
+             view_model_.ideal_bounds(index).bottom()) > max_value) {
+    index--;
+  }
+  return index;
+}
+
+int ShelfView::DetermineFirstVisiblePanelIndex(int min_value) const {
+  int index = model_.FirstPanelIndex();
+  while (index < view_model_.view_size() &&
+         PrimaryAxisValue(
+             view_model_.ideal_bounds(index).right(),
+             view_model_.ideal_bounds(index).bottom()) < min_value) {
+    ++index;
+  }
+  return index;
+}
+
+/* TODO(msw): Restore functionality:
+void ShelfView::AddIconObserver(ShelfIconObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void ShelfView::RemoveIconObserver(ShelfIconObserver* observer) {
+  observers_.RemoveObserver(observer);
+}*/
+
+void ShelfView::AnimateToIdealBounds() {
+  /* TODO(msw): Restore functionality:
+  gfx::Rect overflow_bounds = CalculateIdealBounds();*/
+  CalculateIdealBounds();
+  for (int i = 0; i < view_model_.view_size(); ++i) {
+    views::View* view = view_model_.view_at(i);
+    bounds_animator_->AnimateViewTo(view, view_model_.ideal_bounds(i));
+    // Now that the item animation starts, we have to make sure that the
+    // padding of the first gets properly transferred to the new first item.
+    if (i && view->border())
+      view->SetBorder(views::Border::NullBorder());
+  }
+   /* TODO(msw): Restore functionality:
+   overflow_button_->SetBoundsRect(overflow_bounds);*/
+}
+
+views::View* ShelfView::CreateViewForItem(const ShelfItem& item) {
+  views::View* view = nullptr;
+  switch (item.type) {
+    case TYPE_BROWSER_SHORTCUT:
+    case TYPE_APP_SHORTCUT:
+    case TYPE_WINDOWED_APP:
+    case TYPE_PLATFORM_APP:
+    case TYPE_DIALOG:
+    case TYPE_APP_PANEL: {
+      ShelfButton* button = ShelfButton::Create(this, this);
+      button->SetImage(item.image);
+      ReflectItemStatus(item, button);
+      view = button;
+      break;
+    }
+
+    case TYPE_APP_LIST: {
+      /* TODO(msw): Restore functionality:
+      view = new AppListButton(this, this);*/
+      view = new views::LabelButton(nullptr, item.title);
+      break;
+    }
+
+    case TYPE_MOJO_APP: {
+      // TODO(msw): Support item images, etc.
+      ShelfButton* button = ShelfButton::Create(this, this);
+      int image_resource_id = IDR_DEFAULT_FAVICON;
+      ResourceBundle& rb = ResourceBundle::GetSharedInstance();
+      button->SetImage(*rb.GetImageSkiaNamed(image_resource_id));
+      ReflectItemStatus(item, button);
+      view = button;
+      break;
+    }
+
+    default:
+      break;
+  }
+  view->set_context_menu_controller(this);
+
+  DCHECK(view);
+  ConfigureChildView(view);
+  return view;
+}
+
+void ShelfView::FadeIn(views::View* view) {
+  view->SetVisible(true);
+  view->layer()->SetOpacity(0);
+  AnimateToIdealBounds();
+  bounds_animator_->SetAnimationDelegate(
+      view,
+      scoped_ptr<gfx::AnimationDelegate>(new FadeInAnimationDelegate(view)));
+}
+
+void ShelfView::PrepareForDrag(Pointer pointer, const ui::LocatedEvent& event) {
+  DCHECK(!dragging());
+  DCHECK(drag_view_);
+  drag_pointer_ = pointer;
+  start_drag_index_ = view_model_.GetIndexOfView(drag_view_);
+
+  if (start_drag_index_== -1) {
+    CancelDrag(-1);
+    return;
+  }
+
+  // If the item is no longer draggable, bail out.
+  /* TODO(msw): Restore functionality:
+   ShelfItemDelegate* item_delegate = item_manager_->GetShelfItemDelegate(
+       model_.items()[start_drag_index_].id);
+   if (!item_delegate->IsDraggable()) {
+     CancelDrag(-1);
+     return;
+   }*/
+
+  // Move the view to the front so that it appears on top of other views.
+  ReorderChildView(drag_view_, -1);
+  bounds_animator_->StopAnimatingView(drag_view_);
+}
+
+void ShelfView::ContinueDrag(const ui::LocatedEvent& event) {
+  // Due to a syncing operation the application might have been removed.
+  // Bail if it is gone.
+  int current_index = view_model_.GetIndexOfView(drag_view_);
+  DCHECK_NE(-1, current_index);
+
+  /* TODO(msw): Restore functionality:
+   ShelfItemDelegate* item_delegate =
+       item_manager_->GetShelfItemDelegate(model_.items()[current_index].id);
+   if (!item_delegate->IsDraggable()) {
+     CancelDrag(-1);
+     return;
+   }*/
+
+  // If this is not a drag and drop host operation and not the app list item,
+  // check if the item got ripped off the shelf - if it did we are done.
+  if (!drag_and_drop_shelf_id_ &&
+      RemovableByRipOff(current_index) != NOT_REMOVABLE) {
+    if (HandleRipOffDrag(event))
+      return;
+    // The rip off handler could have changed the location of the item.
+    current_index = view_model_.GetIndexOfView(drag_view_);
+  }
+
+  // TODO: I don't think this works correctly with RTL.
+  gfx::Point drag_point(event.location());
+  ConvertPointToTarget(drag_view_, this, &drag_point);
+
+  // Constrain the location to the range of valid indices for the type.
+  std::pair<int, int> indices(GetDragRange(current_index));
+  int first_drag_index = indices.first;
+  int last_drag_index = indices.second;
+  // If the last index isn't valid, we're overflowing. Constrain to the app list
+  // (which is the last visible item).
+  if (first_drag_index < model_.FirstPanelIndex() &&
+      last_drag_index > last_visible_index_)
+    last_drag_index = last_visible_index_;
+  int x = 0, y = 0;
+  if (IsHorizontalAlignment()) {
+    x = std::max(view_model_.ideal_bounds(indices.first).x(),
+                 drag_point.x() - drag_origin_.x());
+    x = std::min(view_model_.ideal_bounds(last_drag_index).right() -
+                 view_model_.ideal_bounds(current_index).width(),
+                 x);
+    if (drag_view_->x() == x)
+      return;
+    drag_view_->SetX(x);
+  } else {
+    y = std::max(view_model_.ideal_bounds(indices.first).y(),
+                 drag_point.y() - drag_origin_.y());
+    y = std::min(view_model_.ideal_bounds(last_drag_index).bottom() -
+                 view_model_.ideal_bounds(current_index).height(),
+                 y);
+    if (drag_view_->y() == y)
+      return;
+    drag_view_->SetY(y);
+  }
+
+  int target_index =
+      views::ViewModelUtils::DetermineMoveIndex(
+          view_model_, drag_view_,
+          IsHorizontalAlignment() ? views::ViewModelUtils::HORIZONTAL :
+                                    views::ViewModelUtils::VERTICAL,
+          x, y);
+  target_index =
+      std::min(indices.second, std::max(target_index, indices.first));
+
+  int first_draggable_item = 0;
+  /* TODO(msw): Restore functionality:
+  while (first_draggable_item < static_cast<int>(model_.items().size()) &&
+         !item_manager_->GetShelfItemDelegate(
+             model_.items()[first_draggable_item].id)->IsDraggable()) {
+    first_draggable_item++;
+  }*/
+
+  target_index = std::max(target_index, first_draggable_item);
+
+  if (target_index == current_index)
+    return;
+
+  // Change the model, the ShelfItemMoved() callback will handle the
+  // |view_model_| update.
+  model_.Move(current_index, target_index);
+  bounds_animator_->StopAnimatingView(drag_view_);
+}
+
+bool ShelfView::HandleRipOffDrag(const ui::LocatedEvent& event) {
+  /* TODO(msw): Restore functionality:
+  int current_index = view_model_.GetIndexOfView(drag_view_);
+  DCHECK_NE(-1, current_index);
+  std::string dragged_app_id =
+      delegate_->GetAppIDForShelfID(model_.items()[current_index].id);
+
+  gfx::Point screen_location = event.root_location();
+  views::View::ConvertPointToScreen(this, &screen_location);
+
+  // To avoid ugly forwards and backwards flipping we use different constants
+  // for ripping off / re-inserting the items.
+  if (dragged_off_shelf_) {
+    // If the shelf/overflow bubble bounds contains |screen_location| we insert
+    // the item back into the shelf.
+    if (GetBoundsForDragInsertInScreen().Contains(screen_location)) {
+      if (dragged_off_from_overflow_to_shelf_) {
+        // During the dragging an item from Shelf to Overflow, it can enter here
+        // directly because both are located very closly.
+        main_shelf_->EndDrag(true);
+        // Stops the animation of |drag_view_| and sets its bounds explicitly
+        // becase ContinueDrag() stops its animation. Without this, unexpected
+        // bounds will be set.
+        bounds_animator_->StopAnimatingView(drag_view_);
+        int drag_view_index = view_model_.GetIndexOfView(drag_view_);
+        drag_view_->SetBoundsRect(view_model_.ideal_bounds(drag_view_index));
+        dragged_off_from_overflow_to_shelf_ = false;
+      }
+      // Destroy our proxy view item.
+      DestroyDragIconProxy();
+      // Re-insert the item and return simply false since the caller will handle
+      // the move as in any normal case.
+      dragged_off_shelf_ = false;
+      drag_view_->layer()->SetOpacity(1.0f);
+      // The size of Overflow bubble should be updated immediately when an item
+      // is re-inserted.
+      if (is_overflow_mode())
+        PreferredSizeChanged();
+      return false;
+    } else if (is_overflow_mode() &&
+               main_shelf_->GetBoundsForDragInsertInScreen().Contains(
+                   screen_location)) {
+      if (!dragged_off_from_overflow_to_shelf_) {
+        dragged_off_from_overflow_to_shelf_ = true;
+        drag_image_->SetOpacity(1.0f);
+        main_shelf_->StartDrag(dragged_app_id, screen_location);
+      } else {
+        main_shelf_->Drag(screen_location);
+      }
+    } else if (dragged_off_from_overflow_to_shelf_) {
+      // Makes the |drag_image_| partially disappear again.
+      dragged_off_from_overflow_to_shelf_ = false;
+      drag_image_->SetOpacity(kDraggedImageOpacity);
+      main_shelf_->EndDrag(true);
+      bounds_animator_->StopAnimatingView(drag_view_);
+      int drag_view_index = view_model_.GetIndexOfView(drag_view_);
+      drag_view_->SetBoundsRect(view_model_.ideal_bounds(drag_view_index));
+    }
+    // Move our proxy view item.
+    UpdateDragIconProxy(screen_location);
+    return true;
+  }
+  // Check if we are too far away from the shelf to enter the ripped off state.
+  // Determine the distance to the shelf.
+  int delta = CalculateShelfDistance(screen_location);
+  if (delta > kRipOffDistance) {
+    // Create a proxy view item which can be moved anywhere.
+    CreateDragIconProxy(event.root_location(),
+                        drag_view_->GetImage(),
+                        drag_view_,
+                        gfx::Vector2d(0, 0),
+                        kDragAndDropProxyScale);
+    drag_view_->layer()->SetOpacity(0.0f);
+    dragged_off_shelf_ = true;
+    if (RemovableByRipOff(current_index) == REMOVABLE) {
+      // Move the item to the front of the first panel item and hide it.
+      // ShelfItemMoved() callback will handle the |view_model_| update and
+      // call AnimateToIdealBounds().
+      if (current_index != model_.FirstPanelIndex() - 1) {
+        model_.Move(current_index, model_.FirstPanelIndex() - 1);
+        StartFadeInLastVisibleItem();
+      } else if (is_overflow_mode()) {
+        // Overflow bubble should be shrunk when an item is ripped off.
+        PreferredSizeChanged();
+      }
+      // Make the item partially disappear to show that it will get removed if
+      // dropped.
+      drag_image_->SetOpacity(kDraggedImageOpacity);
+    }
+    return true;
+  }*/
+  return false;
+}
+
+void ShelfView::FinalizeRipOffDrag(bool cancel) {
+  /* TODO(msw): Restore functionality:
+  if (!dragged_off_shelf_)
+    return;
+  // Make sure we do not come in here again.
+  dragged_off_shelf_ = false;
+
+  // Coming here we should always have a |drag_view_|.
+  DCHECK(drag_view_);
+  int current_index = view_model_.GetIndexOfView(drag_view_);
+  // If the view isn't part of the model anymore (|current_index| == -1), a sync
+  // operation must have removed it. In that case we shouldn't change the model
+  // and only delete the proxy image.
+  if (current_index == -1) {
+    DestroyDragIconProxy();
+    return;
+  }
+
+  // Set to true when the animation should snap back to where it was before.
+  bool snap_back = false;
+  // Items which cannot be dragged off will be handled as a cancel.
+  if (!cancel) {
+    if (dragged_off_from_overflow_to_shelf_) {
+      dragged_off_from_overflow_to_shelf_ = false;
+      main_shelf_->EndDrag(false);
+      drag_view_->layer()->SetOpacity(1.0f);
+    } else if (RemovableByRipOff(current_index) != REMOVABLE) {
+      // Make sure we do not try to remove un-removable items like items which
+      // were not pinned or have to be always there.
+      cancel = true;
+      snap_back = true;
+    } else {
+      // Make sure the item stays invisible upon removal.
+      drag_view_->SetVisible(false);
+      std::string app_id = 0;
+      std::string app_id =
+          delegate_->GetAppIDForShelfID(model_.items()[current_index].id);
+      delegate_->UnpinAppWithID(app_id);
+    }
+  }
+  if (cancel || snap_back) {
+    if (dragged_off_from_overflow_to_shelf_) {
+      dragged_off_from_overflow_to_shelf_ = false;
+      // Main shelf handles revert of dragged item.
+      main_shelf_->EndDrag(true);
+      drag_view_->layer()->SetOpacity(1.0f);
+    } else if (!cancelling_drag_model_changed_) {
+      // Only do something if the change did not come through a model change.
+      gfx::Rect drag_bounds;
+      gfx::Rect drag_bounds = drag_image_->GetBoundsInScreen();
+      gfx::Point relative_to = GetBoundsInScreen().origin();
+      gfx::Rect target(
+          gfx::PointAtOffsetFromOrigin(drag_bounds.origin()- relative_to),
+          drag_bounds.size());
+      drag_view_->SetBoundsRect(target);
+      // Hide the status from the active item since we snap it back now. Upon
+      // animation end the flag gets cleared if |snap_back_from_rip_off_view_|
+      // is set.
+      snap_back_from_rip_off_view_ = drag_view_;
+      drag_view_->AddState(ShelfButton::STATE_HIDDEN);
+      // When a canceling drag model is happening, the view model is diverged
+      // from the menu model and movements / animations should not be done.
+      model_.Move(current_index, start_drag_index_);
+      AnimateToIdealBounds();
+    }
+    drag_view_->layer()->SetOpacity(1.0f);
+  }
+  DestroyDragIconProxy();*/
+}
+
+ShelfView::RemovableState ShelfView::RemovableByRipOff(int index) const {
+  DCHECK(index >= 0 && index < model_.item_count());
+  ShelfItemType type = model_.items()[index].type;
+  if (type == TYPE_APP_LIST || type == TYPE_DIALOG)
+    return NOT_REMOVABLE;
+
+  /* TODO(msw): Restore functionality:
+  std::string app_id =
+      delegate_->GetAppIDForShelfID(model_.items()[index].id);
+  ShelfItemDelegate* item_delegate =
+      item_manager_->GetShelfItemDelegate(model_.items()[index].id);
+  if (!item_delegate->CanPin())
+    return NOT_REMOVABLE;
+  Note: Only pinned app shortcuts can be removed!
+  return (type == TYPE_APP_SHORTCUT && delegate_->IsAppPinned(app_id)) ?
+      REMOVABLE : DRAGGABLE;*/
+  return REMOVABLE;
+}
+
+bool ShelfView::SameDragType(ShelfItemType typea, ShelfItemType typeb) const {
+  switch (typea) {
+    case TYPE_APP_SHORTCUT:
+    case TYPE_BROWSER_SHORTCUT:
+      return (typeb == TYPE_APP_SHORTCUT || typeb == TYPE_BROWSER_SHORTCUT);
+    case TYPE_APP_LIST:
+    case TYPE_PLATFORM_APP:
+    case TYPE_WINDOWED_APP:
+    case TYPE_MOJO_APP:
+    case TYPE_APP_PANEL:
+    case TYPE_DIALOG:
+      return typeb == typea;
+    case TYPE_UNDEFINED:
+      NOTREACHED() << "ShelfItemType must be set.";
+      return false;
+  }
+  NOTREACHED();
+  return false;
+}
+
+std::pair<int, int> ShelfView::GetDragRange(int index) {
+  int min_index = -1;
+  int max_index = -1;
+  ShelfItemType type = model_.items()[index].type;
+  for (int i = 0; i < model_.item_count(); ++i) {
+    if (SameDragType(model_.items()[i].type, type)) {
+      if (min_index == -1)
+        min_index = i;
+      max_index = i;
+    }
+  }
+  return std::pair<int, int>(min_index, max_index);
+}
+
+void ShelfView::ConfigureChildView(views::View* view) {
+  view->SetPaintToLayer(true);
+  view->layer()->SetFillsBoundsOpaquely(false);
+}
+
+void ShelfView::ToggleOverflowBubble() {
+  /* TODO(msw): Restore functionality:
+  if (IsShowingOverflowBubble()) {
+    overflow_bubble_->Hide();
+    return;
+  }
+
+  if (!overflow_bubble_)
+    overflow_bubble_.reset(new OverflowBubble());
+
+  ShelfView* overflow_view = new ShelfView(app);
+  overflow_view->overflow_mode_ = true;
+  overflow_view->Init();
+  overflow_view->set_owner_overflow_bubble(overflow_bubble_.get());
+  overflow_view->OnShelfAlignmentChanged();
+  overflow_view->main_shelf_ = this;
+  UpdateOverflowRange(overflow_view);
+
+  overflow_bubble_->Show(overflow_button_, overflow_view);
+
+  Shell::GetInstance()->UpdateShelfVisibility();*/
+}
+
+void ShelfView::OnFadeOutAnimationEnded() {
+  AnimateToIdealBounds();
+  StartFadeInLastVisibleItem();
+}
+
+void ShelfView::StartFadeInLastVisibleItem() {
+  // If overflow button is visible and there is a valid new last item, fading
+  // the new last item in after sliding animation is finished.
+  /* TODO(msw): Restore functionality:
+  if (overflow_button_->visible() && last_visible_index_ >= 0) {
+    views::View* last_visible_view =
+        view_model_.view_at(last_visible_index_);
+    last_visible_view->layer()->SetOpacity(0);
+    bounds_animator_->SetAnimationDelegate(
+        last_visible_view,
+        scoped_ptr<gfx::AnimationDelegate>(
+            new StartFadeAnimationDelegate(this, last_visible_view)));
+  }*/
+}
+
+void ShelfView::UpdateOverflowRange(ShelfView* overflow_view) const {
+  const int first_overflow_index = last_visible_index_ + 1;
+  const int last_overflow_index = last_hidden_index_;
+  DCHECK_LE(first_overflow_index, last_overflow_index);
+  DCHECK_LT(last_overflow_index, view_model_.view_size());
+
+  /* TODO(msw): Restore functionality:
+  overflow_view->first_visible_index_ = first_overflow_index;
+  overflow_view->last_visible_index_ = last_overflow_index;*/
+}
+
+bool ShelfView::ShouldHideTooltip(const gfx::Point& cursor_location) {
+  gfx::Rect active_bounds;
+
+  for (int i = 0; i < child_count(); ++i) {
+    views::View* child = child_at(i);
+    /* TODO(msw): Restore functionality:
+    if (child == overflow_button_)
+      continue;*/
+    if (!ShouldShowTooltipForView(child))
+      continue;
+
+    gfx::Rect child_bounds = child->GetMirroredBounds();
+    active_bounds.Union(child_bounds);
+  }
+
+  return !active_bounds.Contains(cursor_location);
+}
+
+gfx::Rect ShelfView::GetVisibleItemsBoundsInScreen() {
+  gfx::Size preferred_size = GetPreferredSize();
+  gfx::Point origin(GetMirroredXWithWidthInView(0, preferred_size.width()), 0);
+  ConvertPointToScreen(this, &origin);
+  return gfx::Rect(origin, preferred_size);
+}
+
+gfx::Rect ShelfView::GetBoundsForDragInsertInScreen() {
+  gfx::Size preferred_size;
+  if (is_overflow_mode()) {
+    /* TODO(msw): Restore functionality:
+    DCHECK(owner_overflow_bubble_);
+    gfx::Rect bubble_bounds =
+        owner_overflow_bubble_->bubble_view()->GetBubbleBounds();
+    preferred_size = bubble_bounds.size();*/
+  } else {
+    const int last_button_index = view_model_.view_size() - 1;
+    gfx::Rect last_button_bounds =
+        view_model_.view_at(last_button_index)->bounds();
+    /* TODO(msw): Restore functionality:
+    if (overflow_button_->visible() &&
+        model_.GetItemIndexForType(TYPE_APP_PANEL) == -1) {
+      // When overflow button is visible and shelf has no panel items,
+      // last_button_bounds should be overflow button's bounds.
+      last_button_bounds = overflow_button_->bounds();
+    }*/
+
+    if (IsHorizontalAlignment()) {
+      preferred_size = gfx::Size(last_button_bounds.right() + leading_inset_,
+                                 kShelfSize);
+    } else {
+      preferred_size = gfx::Size(kShelfSize,
+                                 last_button_bounds.bottom() + leading_inset_);
+    }
+  }
+  gfx::Point origin(GetMirroredXWithWidthInView(0, preferred_size.width()), 0);
+
+  // In overflow mode, we should use OverflowBubbleView as a source for
+  // converting |origin| to screen coordinates. When a scroll operation is
+  // occurred in OverflowBubble, the bounds of ShelfView in OverflowBubble can
+  // be changed.
+  /* TODO(msw): Restore functionality:
+  if (is_overflow_mode())
+    ConvertPointToScreen(owner_overflow_bubble_->bubble_view(), &origin);
+  else
+    ConvertPointToScreen(this, &origin);*/
+
+  return gfx::Rect(origin, preferred_size);
+}
+
+int ShelfView::CancelDrag(int modified_index) {
+  FinalizeRipOffDrag(true);
+  if (!drag_view_)
+    return modified_index;
+  bool was_dragging = dragging();
+  int drag_view_index = view_model_.GetIndexOfView(drag_view_);
+  drag_pointer_ = NONE;
+  drag_view_ = nullptr;
+  if (drag_view_index == modified_index) {
+    // The view that was being dragged is being modified. Don't do anything.
+    return modified_index;
+  }
+  if (!was_dragging)
+    return modified_index;
+
+  // Restore previous position, tracking the position of the modified view.
+  bool at_end = modified_index == view_model_.view_size();
+  views::View* modified_view =
+      (modified_index >= 0 && !at_end) ?
+      view_model_.view_at(modified_index) : nullptr;
+  model_.Move(drag_view_index, start_drag_index_);
+
+  // If the modified view will be at the end of the list, return the new end of
+  // the list.
+  if (at_end)
+    return view_model_.view_size();
+  return modified_view ? view_model_.GetIndexOfView(modified_view) : -1;
 }
 
 gfx::Size ShelfView::GetPreferredSize() const {
-  return gfx::Size(1, 48);
-}
-
-views::View* ShelfView::GetContentsView() {
+  const_cast<ShelfView*>(this)->CalculateIdealBounds();
+
+  int last_button_index = is_overflow_mode() ?
+      last_visible_index_ : view_model_.view_size() - 1;
+
+  // When an item is dragged off from the overflow bubble, it is moved to last
+  // position and and changed to invisible. Overflow bubble size should be
+  // shrunk to fit only for visible items.
+  // If |dragged_off_from_overflow_to_shelf_| is set, there will be no invisible
+  // items in the shelf.
+  if (is_overflow_mode() &&
+      dragged_off_shelf_ &&
+      !dragged_off_from_overflow_to_shelf_ &&
+      RemovableByRipOff(view_model_.GetIndexOfView(drag_view_)) == REMOVABLE)
+    last_button_index--;
+
+  const gfx::Rect last_button_bounds =
+      last_button_index  >= first_visible_index_ ?
+          view_model_.ideal_bounds(last_button_index) :
+          gfx::Rect(gfx::Size(kShelfSize, kShelfSize));
+
+  if (IsHorizontalAlignment())
+    return gfx::Size(last_button_bounds.right() + leading_inset_, kShelfSize);
+
+  return gfx::Size(kShelfSize, last_button_bounds.bottom() + leading_inset_);
+}
+
+void ShelfView::OnBoundsChanged(const gfx::Rect& previous_bounds) {
+  // This bounds change is produced by the shelf movement and all content has
+  // to follow. Using an animation at that time would produce a time lag since
+  // the animation of the BoundsAnimator has itself a delay before it arrives
+  // at the required location. As such we tell the animator to go there
+  // immediately.
+  BoundsAnimatorDisabler disabler(bounds_animator_.get());
+  LayoutToIdealBounds();
+  /* TODO(msw): Restore functionality:
+  FOR_EACH_OBSERVER(ShelfIconObserver, observers_,
+                    OnShelfIconPositionsChanged());
+
+  if (IsShowingOverflowBubble())
+    overflow_bubble_->Hide();*/
+}
+
+views::FocusTraversable* ShelfView::GetPaneFocusTraversable() {
   return this;
 }
 
+void ShelfView::GetAccessibleState(ui::AXViewState* state) {
+  state->role = ui::AX_ROLE_TOOLBAR;
+  /* TODO(msw): Restore functionality:
+  state->name = l10n_util::GetStringUTF16(IDS_ASH_SHELF_ACCESSIBLE_NAME);*/
+}
+
+/* TODO(msw): Restore functionality:
+void ShelfView::OnGestureEvent(ui::GestureEvent* event) {
+  aura::Window* target_window = static_cast<views::View*>(event->target())
+                                    ->GetWidget()
+                                    ->GetNativeWindow();
+  if (gesture_handler_.ProcessGestureEvent(*event, target_window))
+    event->StopPropagation();
+}*/
+
+void ShelfView::ShelfItemAdded(int model_index) {
+  {
+    base::AutoReset<bool> cancelling_drag(
+        &cancelling_drag_model_changed_, true);
+    model_index = CancelDrag(model_index);
+  }
+  views::View* view = CreateViewForItem(model_.items()[model_index]);
+  AddChildView(view);
+  // Hide the view, it'll be made visible when the animation is done. Using
+  // opacity 0 here to avoid messing with CalculateIdealBounds which touches
+  // the view's visibility.
+  view->layer()->SetOpacity(0);
+  view_model_.Add(view, model_index);
+
+  // Give the button its ideal bounds. That way if we end up animating the
+  // button before this animation completes it doesn't appear at some random
+  // spot (because it was in the middle of animating from 0,0 0x0 to its
+  // target).
+  CalculateIdealBounds();
+  view->SetBoundsRect(view_model_.ideal_bounds(model_index));
+
+  // The first animation moves all the views to their target position. |view|
+  // is hidden, so it visually appears as though we are providing space for
+  // it. When done we'll fade the view in.
+  AnimateToIdealBounds();
+  if (model_index <= last_visible_index_ ||
+      model_index >= model_.FirstPanelIndex()) {
+    bounds_animator_->SetAnimationDelegate(
+        view,
+        scoped_ptr<gfx::AnimationDelegate>(
+            new StartFadeAnimationDelegate(this, view)));
+  } else {
+    // Undo the hiding if animation does not run.
+    view->layer()->SetOpacity(1.0f);
+  }
+}
+
+void ShelfView::ShelfItemRemoved(int model_index, ShelfID id) {
+  if (id == context_menu_id_)
+    launcher_menu_runner_.reset();
+  {
+    base::AutoReset<bool> cancelling_drag(
+        &cancelling_drag_model_changed_, true);
+    model_index = CancelDrag(model_index);
+  }
+  views::View* view = view_model_.view_at(model_index);
+  view_model_.Remove(model_index);
+
+  // When the overflow bubble is visible, the overflow range needs to be set
+  // before CalculateIdealBounds() gets called. Otherwise CalculateIdealBounds()
+  // could trigger a ShelfItemChanged() by hiding the overflow bubble and
+  // since the overflow bubble is not yet synced with the ShelfModel this
+  // could cause a crash.
+  /* TODO(msw): Restore functionality:
+  if (overflow_bubble_ && overflow_bubble_->IsShowing()) {
+     last_hidden_index_ = std::min(last_hidden_index_,
+                                   view_model_.view_size() - 1);
+     UpdateOverflowRange(overflow_bubble_->shelf_view());
+   }*/
+
+  if (view->visible()) {
+    // The first animation fades out the view. When done we'll animate the rest
+    // of the views to their target location.
+    bounds_animator_->AnimateViewTo(view, view->bounds());
+    bounds_animator_->SetAnimationDelegate(
+        view,
+        scoped_ptr<gfx::AnimationDelegate>(
+            new FadeOutAnimationDelegate(this, view)));
+  } else {
+    // We don't need to show a fade out animation for invisible |view|. When an
+    // item is ripped out from the shelf, its |view| is already invisible.
+    AnimateToIdealBounds();
+  }
+
+  // Close the tooltip because it isn't needed any longer and its anchor view
+  // will be deleted soon.
+  if (tooltip_.GetCurrentAnchorView() == view)
+    tooltip_.Close();
+}
+
+void ShelfView::ShelfItemChanged(int model_index, const ShelfItem& old_item) {
+  const ShelfItem& item(model_.items()[model_index]);
+  if (old_item.type != item.type) {
+    // Type changed, swap the views.
+    model_index = CancelDrag(model_index);
+    scoped_ptr<views::View> old_view(view_model_.view_at(model_index));
+    bounds_animator_->StopAnimatingView(old_view.get());
+    // Removing and re-inserting a view in our view model will strip the ideal
+    // bounds from the item. To avoid recalculation of everything the bounds
+    // get remembered and restored after the insertion to the previous value.
+    gfx::Rect old_ideal_bounds = view_model_.ideal_bounds(model_index);
+    view_model_.Remove(model_index);
+    views::View* new_view = CreateViewForItem(item);
+    AddChildView(new_view);
+    view_model_.Add(new_view, model_index);
+    view_model_.set_ideal_bounds(model_index, old_ideal_bounds);
+    new_view->SetBoundsRect(old_view->bounds());
+    return;
+  }
+
+  views::View* view = view_model_.view_at(model_index);
+  switch (item.type) {
+    case TYPE_BROWSER_SHORTCUT:
+      // Fallthrough for the new Shelf since it needs to show the activation
+      // change as well.
+    case TYPE_APP_SHORTCUT:
+    case TYPE_WINDOWED_APP:
+    case TYPE_PLATFORM_APP:
+    case TYPE_DIALOG:
+    case TYPE_APP_PANEL: {
+      CHECK_EQ(ShelfButton::kViewClassName, view->GetClassName());
+      ShelfButton* button = static_cast<ShelfButton*>(view);
+      ReflectItemStatus(item, button);
+      // The browser shortcut is currently not a "real" item and as such the
+      // the image is bogous as well. We therefore keep the image as is for it.
+      if (item.type != TYPE_BROWSER_SHORTCUT)
+        button->SetImage(item.image);
+      button->SchedulePaint();
+      break;
+    }
+    case TYPE_MOJO_APP: {
+      CHECK_EQ(ShelfButton::kViewClassName, view->GetClassName());
+      ShelfButton* button = static_cast<ShelfButton*>(view);
+      button->SetTooltipText(item.title);
+      break;
+    }
+
+    default:
+      break;
+  }
+}
+
+void ShelfView::ShelfItemMoved(int start_index, int target_index) {
+  view_model_.Move(start_index, target_index);
+  // When cancelling a drag due to a shelf item being added, the currently
+  // dragged item is moved back to its initial position. AnimateToIdealBounds
+  // will be called again when the new item is added to the |view_model_| but
+  // at this time the |view_model_| is inconsistent with the |model_|.
+  if (!cancelling_drag_model_changed_)
+    AnimateToIdealBounds();
+}
+
+void ShelfView::ShelfStatusChanged() {
+  // Nothing to do here.
+}
+
+ShelfAlignment ShelfView::GetAlignment() const {
+  return alignment_;
+}
+
+bool ShelfView::IsHorizontalAlignment() const {
+  return alignment_ == SHELF_ALIGNMENT_BOTTOM ||
+         alignment_ == SHELF_ALIGNMENT_TOP;
+}
+
+void ShelfView::PointerPressedOnButton(views::View* view,
+                                       Pointer pointer,
+                                       const ui::LocatedEvent& event) {
+  if (drag_view_)
+    return;
+
+  int index = view_model_.GetIndexOfView(view);
+  if (index == -1)
+    return;
+
+  /* TODO(msw): Restore functionality:
+   ShelfItemDelegate* item_delegate = item_manager_->GetShelfItemDelegate(
+       model_.items()[index].id);
+   if (view_model_.view_size() <= 1 || !item_delegate->IsDraggable())
+     return;  // View is being deleted or not draggable, ignore request.*/
+
+  // Only when the repost event occurs on the same shelf item, we should ignore
+  // the call in ShelfView::ButtonPressed(...).
+  is_repost_event_ = IsRepostEvent(event) && (last_pressed_index_ == index);
+
+  CHECK_EQ(ShelfButton::kViewClassName, view->GetClassName());
+  drag_view_ = static_cast<ShelfButton*>(view);
+  drag_origin_ = gfx::Point(event.x(), event.y());
+  /* TODO(msw): Restore functionality:
+  UMA_HISTOGRAM_ENUMERATION("Ash.ShelfAlignmentUsage",
+      layout_manager_->SelectValueForShelfAlignment(
+          SHELF_ALIGNMENT_UMA_ENUM_VALUE_BOTTOM,
+          SHELF_ALIGNMENT_UMA_ENUM_VALUE_LEFT,
+          SHELF_ALIGNMENT_UMA_ENUM_VALUE_RIGHT,
+          -1),
+      SHELF_ALIGNMENT_UMA_ENUM_VALUE_COUNT);*/
+}
+
+void ShelfView::PointerDraggedOnButton(views::View* view,
+                                       Pointer pointer,
+                                       const ui::LocatedEvent& event) {
+  // To prepare all drag types (moving an item in the shelf and dragging off),
+  // we should check the x-axis and y-axis offset.
+  if (!dragging() && drag_view_ &&
+      ((std::abs(event.x() - drag_origin_.x()) >= kMinimumDragDistance) ||
+       (std::abs(event.y() - drag_origin_.y()) >= kMinimumDragDistance))) {
+    PrepareForDrag(pointer, event);
+  }
+  if (drag_pointer_ == pointer)
+    ContinueDrag(event);
+}
+
+void ShelfView::PointerReleasedOnButton(views::View* view,
+                                        Pointer pointer,
+                                        bool canceled) {
+  // Reset |is_repost_event| to false.
+  is_repost_event_ = false;
+
+  if (canceled) {
+    CancelDrag(-1);
+  } else if (drag_pointer_ == pointer) {
+    FinalizeRipOffDrag(false);
+    drag_pointer_ = NONE;
+    AnimateToIdealBounds();
+  }
+  // If the drag pointer is NONE, no drag operation is going on and the
+  // drag_view can be released.
+  if (drag_pointer_ == NONE)
+    drag_view_ = nullptr;
+}
+
+void ShelfView::MouseMovedOverButton(views::View* view) {
+  if (!ShouldShowTooltipForView(view))
+    return;
+
+  if (!tooltip_.IsVisible())
+    tooltip_.ResetTimer();
+}
+
+void ShelfView::MouseEnteredButton(views::View* view) {
+  // TODO(msw): Fix the initial (0,0) mouse event (causes tooltip on startup).
+  if (!ShouldShowTooltipForView(view))
+    return;
+
+  if (tooltip_.IsVisible())
+    tooltip_.ShowImmediately(view, GetAccessibleName(view));
+  else
+    tooltip_.ShowDelayed(view, GetAccessibleName(view));
+}
+
+void ShelfView::MouseExitedButton(views::View* view) {
+  if (!tooltip_.IsVisible())
+    tooltip_.StopTimer();
+}
+
+base::string16 ShelfView::GetAccessibleName(const views::View* view) {
+  int view_index = view_model_.GetIndexOfView(view);
+  // May be -1 while in the process of animating closed.
+  if (view_index == -1)
+    return base::string16();
+  return model_.items()[view_index].title;
+}
+
 void ShelfView::ButtonPressed(views::Button* sender, const ui::Event& event) {
-  user_window_controller_->FocusUserWindow(sender->tag());
-}
-
-void ShelfView::OnUserWindowObserverAdded(
-    mojo::Array<mash::wm::mojom::UserWindowPtr> user_windows) {
-  for (size_t i = 0; i < user_windows.size(); ++i)
-    OnUserWindowAdded(std::move(user_windows[i]));
-}
-
-void ShelfView::OnUserWindowAdded(mash::wm::mojom::UserWindowPtr user_window) {
-  views::LabelButton* open_window_button = new views::LabelButton(
-      this, user_window->window_title.To<base::string16>());
-  open_window_button->set_tag(user_window->window_id);
-  open_window_buttons_.push_back(open_window_button);
-  AddChildView(open_window_button);
-  Layout();
-  SchedulePaint();
-}
-
-void ShelfView::OnUserWindowRemoved(uint32_t window_id) {
-  const size_t index = GetButtonIndexById(window_id);
-  if (index >= open_window_buttons_.size())
-    return;
-
-  views::LabelButton* button = open_window_buttons_[index];
-  open_window_buttons_.erase(open_window_buttons_.begin() + index);
-  RemoveChildView(button);
-  delete button;
-  Layout();
-  SchedulePaint();
-}
-
-void ShelfView::OnUserWindowTitleChanged(uint32_t window_id,
-                                         const mojo::String& window_title) {
-  const size_t index = GetButtonIndexById(window_id);
-  if (index >= open_window_buttons_.size())
-    return;
-
-  open_window_buttons_[index]->SetText(window_title.To<base::string16>());
-  open_window_buttons_[index]->SetMinSize(gfx::Size());
-  Layout();
-  SchedulePaint();
+  // Do not handle mouse release during drag.
+  if (dragging())
+    return;
+
+  /* TODO(msw): Restore functionality:
+   if (sender == overflow_button_) {
+     ToggleOverflowBubble();
+     shelf_button_pressed_metric_tracker_.ButtonPressed(
+         event, sender, ShelfItemDelegate::kNoAction);
+     return;
+   }*/
+
+  int view_index = view_model_.GetIndexOfView(sender);
+  // May be -1 while in the process of animating closed.
+  if (view_index == -1)
+    return;
+
+  // If the menu was just closed by the same event as this one, we ignore
+  // the call and don't open the menu again. See crbug.com/343005 for more
+  // detail.
+  if (is_repost_event_)
+    return;
+
+  // Record the index for the last pressed shelf item.
+  last_pressed_index_ = view_index;
+
+  // Don't activate the item twice on double-click. Otherwise the window starts
+  // animating open due to the first click, then immediately minimizes due to
+  // the second click. The user most likely intended to open or minimize the
+  // item once, not do both.
+  if (event.flags() & ui::EF_IS_DOUBLE_CLICK)
+    return;
+
+  {
+    /* TODO(msw): Restore functionality:
+    ScopedTargetRootWindow scoped_target(
+        sender->GetWidget()->GetNativeView()->GetRootWindow());*/
+    // Slow down activation animations if shift key is pressed.
+    scoped_ptr<ui::ScopedAnimationDurationScaleMode> slowing_animations;
+    if (event.IsShiftDown()) {
+      slowing_animations.reset(new ui::ScopedAnimationDurationScaleMode(
+            ui::ScopedAnimationDurationScaleMode::SLOW_DURATION));
+    }
+
+    // Collect usage statistics before we decide what to do with the click.
+    const ShelfItem& item(model_.items()[view_index]);
+    switch (item.type) {
+      case TYPE_APP_SHORTCUT:
+      case TYPE_WINDOWED_APP:
+      case TYPE_PLATFORM_APP:
+      case TYPE_MOJO_APP:
+      case TYPE_BROWSER_SHORTCUT:
+        /* TODO(msw): Restore functionality:
+        Shell::GetInstance()->metrics()->RecordUserMetricsAction(
+            UMA_LAUNCHER_CLICK_ON_APP);*/
+        break;
+
+      case TYPE_APP_LIST:
+        /* TODO(msw): Restore functionality:
+        Shell::GetInstance()->metrics()->RecordUserMetricsAction(
+            UMA_LAUNCHER_CLICK_ON_APPLIST_BUTTON);*/
+        break;
+
+      case TYPE_APP_PANEL:
+      case TYPE_DIALOG:
+        break;
+
+      case TYPE_UNDEFINED:
+        NOTREACHED() << "ShelfItemType must be set.";
+        break;
+    }
+
+    // TODO(msw): Support GetShelfItemDelegate[Manager], actions, etc.
+    if (item.type == TYPE_MOJO_APP)
+      model_.user_window_controller()->FocusUserWindow(item.window_id);
+
+    /* TODO(msw): Restore functionality:
+     ShelfItemDelegate::PerformedAction performed_action =
+         item_manager_->GetShelfItemDelegate(model_.items()[view_index].id)
+             ->ItemSelected(event);
+
+     shelf_button_pressed_metric_tracker_.ButtonPressed(event, sender,
+                                                        performed_action);
+
+     if (performed_action != ShelfItemDelegate::kNewWindowCreated)
+       ShowListMenuForView(model_.items()[view_index], sender, event);*/
+  }
+}
+
+bool ShelfView::ShowListMenuForView(const ShelfItem& item,
+                                    views::View* source,
+                                    const ui::Event& event) {
+  /* TODO(msw): Restore functionality:
+  ShelfItemDelegate* item_delegate =
+      item_manager_->GetShelfItemDelegate(item.id);
+  scoped_ptr<ui::MenuModel> list_menu_model(
+      item_delegate->CreateApplicationMenu(event.flags()));
+
+  Make sure we have a menu and it has at least two items in addition to the
+  application title and the 3 spacing separators.
+  if (!list_menu_model.get() || list_menu_model->GetItemCount() <= 5)
+    return false;
+
+  ShowMenu(list_menu_model.get(),
+           source,
+           gfx::Point(),
+           false,
+           ui::GetMenuSourceTypeForEvent(event));*/
+  return true;
+}
+
+void ShelfView::ShowContextMenuForView(views::View* source,
+                                       const gfx::Point& point,
+                                       ui::MenuSourceType source_type) {
+  int view_index = view_model_.GetIndexOfView(source);
+  if (view_index == -1) {
+    /* TODO(msw): Restore functionality:
+    Shell::GetInstance()->ShowContextMenu(point, source_type);*/
+    return;
+  }
+
+  /* TODO(msw): Restore functionality:
+  ShelfItemDelegate* item_delegate = item_manager_->GetShelfItemDelegate(
+      model_.items()[view_index].id);
+  context_menu_model_.reset(item_delegate->CreateContextMenu(
+      source->GetWidget()->GetNativeView()->GetRootWindow()));
+  if (!context_menu_model_)
+    return;
+
+  base::AutoReset<ShelfID> reseter(
+      &context_menu_id_,
+      view_index == -1 ? 0 : model_.items()[view_index].id);
+
+  ShowMenu(context_menu_model_.get(),
+           source,
+           point,
+           true,
+           source_type);*/
+}
+
+void ShelfView::ShowMenu(ui::MenuModel* menu_model,
+                         views::View* source,
+                         const gfx::Point& click_point,
+                         bool context_menu,
+                         ui::MenuSourceType source_type) {
+  closing_event_time_ = base::TimeDelta();
+  launcher_menu_runner_.reset(new views::MenuRunner(
+      menu_model, context_menu ? views::MenuRunner::CONTEXT_MENU : 0));
+
+  /* TODO(msw): Restore functionality:
+  ScopedTargetRootWindow scoped_target(
+      source->GetWidget()->GetNativeView()->GetRootWindow());*/
+
+  // Determine the menu alignment dependent on the shelf.
+  views::MenuAnchorPosition menu_alignment = views::MENU_ANCHOR_TOPLEFT;
+  gfx::Rect anchor_point = gfx::Rect(click_point, gfx::Size());
+
+  if (!context_menu) {
+    // Application lists use a bubble.
+    anchor_point = source->GetBoundsInScreen();
+
+    // It is possible to invoke the menu while it is sliding into view. To cover
+    // that case, the screen coordinates are offsetted by the animation delta.
+    gfx::Vector2d offset =
+        source->GetWidget()->GetNativeWindow()->bounds().origin() -
+        source->GetWidget()->GetNativeWindow()->GetTargetBounds().origin();
+    anchor_point.set_x(anchor_point.x() - offset.x());
+    anchor_point.set_y(anchor_point.y() - offset.y());
+
+    // Shelf items can have an asymmetrical border for spacing reasons.
+    // Adjust anchor location for this.
+    if (source->border())
+      anchor_point.Inset(source->border()->GetInsets());
+
+    menu_alignment = SelectValueForShelfAlignment(
+        views::MENU_ANCHOR_BUBBLE_ABOVE, views::MENU_ANCHOR_BUBBLE_RIGHT,
+        views::MENU_ANCHOR_BUBBLE_LEFT, views::MENU_ANCHOR_BUBBLE_BELOW);
+  }
+  // If this gets deleted while we are in the menu, the shelf will be gone
+  // as well.
+  bool got_deleted = false;
+  got_deleted_ = &got_deleted;
+
+  /* TODO(msw): Restore functionality:
+  shelf->ForceUndimming(true);*/
+  // NOTE: if you convert to HAS_MNEMONICS be sure and update menu building
+  // code.
+  if (launcher_menu_runner_->RunMenuAt(source->GetWidget(),
+                                       nullptr,
+                                       anchor_point,
+                                       menu_alignment,
+                                       source_type) ==
+      views::MenuRunner::MENU_DELETED) {
+    if (!got_deleted) {
+      got_deleted_ = nullptr;
+      /* TODO(msw): Restore functionality:
+      shelf->ForceUndimming(false);*/
+    }
+    return;
+  }
+  got_deleted_ = nullptr;
+  /* TODO(msw): Restore functionality:
+  shelf->ForceUndimming(false);*/
+
+  // If it is a context menu and we are showing overflow bubble
+  // we want to hide overflow bubble.
+  /* TODO(msw): Restore functionality:
+  if (owner_overflow_bubble_)
+    owner_overflow_bubble_->HideBubbleAndRefreshButton();*/
+
+  // Unpinning an item will reset the |launcher_menu_runner_| before coming
+  // here.
+  if (launcher_menu_runner_)
+    closing_event_time_ = launcher_menu_runner_->closing_event_time();
+  /* TODO(msw): Restore functionality:
+  Shell::GetInstance()->UpdateShelfVisibility();*/
+}
+
+void ShelfView::OnBoundsAnimatorProgressed(views::BoundsAnimator* animator) {
+  /* TODO(msw): Restore functionality:
+  FOR_EACH_OBSERVER(ShelfIconObserver, observers_,
+                    OnShelfIconPositionsChanged());*/
+  PreferredSizeChanged();
+}
+
+void ShelfView::OnBoundsAnimatorDone(views::BoundsAnimator* animator) {
+  if (snap_back_from_rip_off_view_ && animator == bounds_animator_.get()) {
+    if (!animator->IsAnimating(snap_back_from_rip_off_view_)) {
+      // Coming here the animation of the ShelfButton is finished and the
+      // previously hidden status can be shown again. Since the button itself
+      // might have gone away or changed locations we check that the button
+      // is still in the shelf and show its status again.
+      for (int index = 0; index < view_model_.view_size(); index++) {
+        views::View* view = view_model_.view_at(index);
+        if (view == snap_back_from_rip_off_view_) {
+          CHECK_EQ(ShelfButton::kViewClassName, view->GetClassName());
+          ShelfButton* button = static_cast<ShelfButton*>(view);
+          button->ClearState(ShelfButton::STATE_HIDDEN);
+          break;
+        }
+      }
+      snap_back_from_rip_off_view_ = nullptr;
+    }
+  }
+}
+
+bool ShelfView::IsRepostEvent(const ui::Event& event) {
+  if (closing_event_time_ == base::TimeDelta())
+    return false;
+
+  base::TimeDelta delta =
+      base::TimeDelta(event.time_stamp() - closing_event_time_);
+  closing_event_time_ = base::TimeDelta();
+  // If the current (press down) event is a repost event, the time stamp of
+  // these two events should be the same.
+  return (delta.InMilliseconds() == 0);
+}
+
+const ShelfItem* ShelfView::ShelfItemForView(const views::View* view) const {
+  int view_index = view_model_.GetIndexOfView(view);
+  if (view_index == -1)
+    return nullptr;
+  return &(model_.items()[view_index]);
+}
+
+bool ShelfView::ShouldShowTooltipForView(const views::View* view) const {
+  /* TODO(msw): Restore functionality:
+  if (view == GetAppListButtonView() &&
+      Shell::GetInstance()->GetAppListWindow())
+    return false;
+  const ShelfItem* item = ShelfItemForView(view);
+  if (!item)
+    return true;
+  return item_manager_->GetShelfItemDelegate(item->id)->ShouldShowTooltip();*/
+  return true;
+}
+
+int ShelfView::CalculateShelfDistance(const gfx::Point& coordinate) const {
+  const gfx::Rect bounds = GetBoundsInScreen();
+  int distance = 0;
+  switch (GetAlignment()) {
+    case SHELF_ALIGNMENT_BOTTOM:
+      distance = bounds.y() - coordinate.y();
+      break;
+    case SHELF_ALIGNMENT_LEFT:
+      distance = coordinate.x() - bounds.right();
+      break;
+    case SHELF_ALIGNMENT_RIGHT:
+      distance = bounds.x() - coordinate.x();
+      break;
+    case SHELF_ALIGNMENT_TOP:
+      distance = coordinate.y() - bounds.bottom();
+      break;
+  }
+  return distance > 0 ? distance : 0;
 }
 
 }  // namespace shelf
 }  // namespace mash