ash/shelf/shelf

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This source file includes following definitions.
bounds_animator_
menu_model_
GetLabelFontList
IsCommandEnabled
GetForegroundColor
GetBackgroundColor
GetHorizontalIconMargins
GetMaxWidthForMenu
ShouldReserveSpaceForSubmenuIndicator
view_model_
FindNextFocusableView
AnimationProgressed
AnimationEnded
AnimationCanceled
ReflectItemStatus
view_
FadeOutAnimationDelegate
AnimationProgressed
AnimationEnded
AnimationCanceled
view_
StartFadeAnimationDelegate
AnimationEnded
AnimationCanceled
dragged_off_from_overflow_to_shelf_
Init
OnShelfAlignmentChanged
SchedulePaintForAllButtons
GetIdealBoundsOfItemIcon
UpdatePanelIconPosition
IsShowingMenu
IsShowingOverflowBubble
GetAppListButtonView
GetFocusSearch
GetFocusTraversableParent
GetFocusTraversableParentView
CreateDragIconProxy
UpdateDragIconProxy
DestroyDragIconProxy
StartDrag
Drag
EndDrag
LayoutToIdealBounds
UpdateAllButtonsVisibilityInOverflowMode
CalculateIdealBounds
DetermineLastVisibleIndex
DetermineFirstVisiblePanelIndex
AddIconObserver
RemoveIconObserver
AnimateToIdealBounds
CreateViewForItem
FadeIn
PrepareForDrag
ContinueDrag
HandleRipOffDrag
FinalizeRipOffDrag
RemovableByRipOff
SameDragType
GetDragRange
ConfigureChildView
ToggleOverflowBubble
UpdateFirstButtonPadding
OnFadeOutAnimationEnded
StartFadeInLastVisibleItem
UpdateOverflowRange
GetButtonSize
GetButtonSpacing
ShouldHideTooltip
GetVisibleItemsBoundsInScreen
GetBoundsForDragInsertInScreen
CancelDrag
GetPreferredSize
OnBoundsChanged
GetPaneFocusTraversable
GetAccessibleState
OnGestureEvent
ShelfItemAdded
ShelfItemRemoved
ShelfItemChanged
ShelfItemMoved
ShelfStatusChanged
PointerPressedOnButton
PointerDraggedOnButton
PointerReleasedOnButton
MouseMovedOverButton
MouseEnteredButton
MouseExitedButton
GetAccessibleName
ButtonPressed
ShowListMenuForView
ShowContextMenuForView
ShowMenu
OnBoundsAnimatorProgressed
OnBoundsAnimatorDone
IsUsableEvent
ShelfItemForView
ShouldShowTooltipForView
CalculateShelfDistance
// 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/shelf/shelf_view.h"

#include <algorithm>

#include "ash/ash_constants.h"
#include "ash/ash_switches.h"
#include "ash/drag_drop/drag_image_view.h"
#include "ash/metrics/user_metrics_recorder.h"
#include "ash/root_window_controller.h"
#include "ash/scoped_target_root_window.h"
#include "ash/shelf/alternate_app_list_button.h"
#include "ash/shelf/app_list_button.h"
#include "ash/shelf/overflow_bubble.h"
#include "ash/shelf/overflow_bubble_view.h"
#include "ash/shelf/overflow_button.h"
#include "ash/shelf/shelf_button.h"
#include "ash/shelf/shelf_constants.h"
#include "ash/shelf/shelf_delegate.h"
#include "ash/shelf/shelf_icon_observer.h"
#include "ash/shelf/shelf_item_delegate.h"
#include "ash/shelf/shelf_item_delegate_manager.h"
#include "ash/shelf/shelf_layout_manager.h"
#include "ash/shelf/shelf_menu_model.h"
#include "ash/shelf/shelf_model.h"
#include "ash/shelf/shelf_tooltip_manager.h"
#include "ash/shelf/shelf_widget.h"
#include "ash/shell.h"
#include "ash/wm/coordinate_conversion.h"
#include "base/auto_reset.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram.h"
#include "grit/ash_resources.h"
#include "grit/ash_strings.h"
#include "ui/accessibility/ax_view_state.h"
#include "ui/aura/client/screen_position_client.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/gfx/canvas.h"
#include "ui/gfx/point.h"
#include "ui/views/animation/bounds_animator.h"
#include "ui/views/border.h"
#include "ui/views/controls/button/image_button.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.h"
#include "ui/views/view_model_utils.h"
#include "ui/views/widget/widget.h"

using gfx::Animation;
using views::View;

namespace ash {

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;

// Size between the buttons.
const int kButtonSpacing = 4;
const int kAlternateButtonSpacing = 10;

// Size allocated to for each button.
const int kButtonSize = 44;

// Additional spacing for the left and right side of icons.
const int kHorizontalIconSpacing = 2;

// Inset for items which do not have an icon.
const int kHorizontalNoIconInsetSpacing =
    kHorizontalIconSpacing + kDefaultLeadingInset;

// 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;

// This is the command id of the menu item which contains the name of the menu.
const int kCommandIdOfMenuName = 0;

// The background color of the active item in the list.
const SkColor kActiveListItemBackgroundColor = SkColorSetRGB(203 , 219, 241);

// The background color of the active & hovered item in the list.
const SkColor kFocusedActiveListItemBackgroundColor =
    SkColorSetRGB(193, 211, 236);

// The text color of the caption item in a list.
const SkColor kCaptionItemForegroundColor = SK_ColorBLACK;

// The maximum allowable length of a menu line of an application menu in pixels.
const int kMaximumAppMenuItemLength = 350;

// 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:
  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);
};

// The MenuModelAdapter gets slightly changed to adapt the menu appearance to
// our requirements.
class ShelfMenuModelAdapter : public views::MenuModelAdapter {
 public:
  explicit ShelfMenuModelAdapter(ShelfMenuModel* menu_model);

  // views::MenuModelAdapter:
  virtual const gfx::FontList* GetLabelFontList(int command_id) const OVERRIDE;
  virtual bool IsCommandEnabled(int id) const OVERRIDE;
  virtual void GetHorizontalIconMargins(int id,
                                        int icon_size,
                                        int* left_margin,
                                        int* right_margin) const OVERRIDE;
  virtual bool GetForegroundColor(int command_id,
                                  bool is_hovered,
                                  SkColor* override_color) const OVERRIDE;
  virtual bool GetBackgroundColor(int command_id,
                                  bool is_hovered,
                                  SkColor* override_color) const OVERRIDE;
  virtual int GetMaxWidthForMenu(views::MenuItemView* menu) OVERRIDE;
  virtual bool ShouldReserveSpaceForSubmenuIndicator() const OVERRIDE;

 private:
  ShelfMenuModel* menu_model_;

  DISALLOW_COPY_AND_ASSIGN(ShelfMenuModelAdapter);
};

ShelfMenuModelAdapter::ShelfMenuModelAdapter(ShelfMenuModel* menu_model)
    : MenuModelAdapter(menu_model),
      menu_model_(menu_model) {
}

const gfx::FontList* ShelfMenuModelAdapter::GetLabelFontList(
    int command_id) const {
  if (command_id != kCommandIdOfMenuName)
    return MenuModelAdapter::GetLabelFontList(command_id);

  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  return &rb.GetFontList(ui::ResourceBundle::BoldFont);
}

bool ShelfMenuModelAdapter::IsCommandEnabled(int id) const {
  return id != kCommandIdOfMenuName;
}

bool ShelfMenuModelAdapter::GetForegroundColor(int command_id,
                                               bool is_hovered,
                                               SkColor* override_color) const {
  if (command_id != kCommandIdOfMenuName)
    return false;

  *override_color = kCaptionItemForegroundColor;
  return true;
}

bool ShelfMenuModelAdapter::GetBackgroundColor(int command_id,
                                               bool is_hovered,
                                               SkColor* override_color) const {
  if (!menu_model_->IsCommandActive(command_id))
    return false;

  *override_color = is_hovered ? kFocusedActiveListItemBackgroundColor :
                                 kActiveListItemBackgroundColor;
  return true;
}

void ShelfMenuModelAdapter::GetHorizontalIconMargins(int command_id,
                                                     int icon_size,
                                                     int* left_margin,
                                                     int* right_margin) const {
  *left_margin = kHorizontalIconSpacing;
  *right_margin = (command_id != kCommandIdOfMenuName) ?
      kHorizontalIconSpacing : -(icon_size + kHorizontalNoIconInsetSpacing);
}

int ShelfMenuModelAdapter::GetMaxWidthForMenu(views::MenuItemView* menu) {
  return kMaximumAppMenuItemLength;
}

bool ShelfMenuModelAdapter::ShouldReserveSpaceForSubmenuIndicator() const {
  return false;
}

// 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(NULL, true, true),
        view_model_(view_model) {}
  virtual ~ShelfFocusSearch() {}

  // views::FocusSearch overrides:
  virtual View* FindNextFocusableView(
      View* starting_view,
      bool reverse,
      Direction direction,
      bool check_starting_view,
      views::FocusTraversable** focus_traversable,
      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 views::BoundsAnimator::OwnedAnimationDelegate {
 public:
  explicit FadeInAnimationDelegate(views::View* view) : view_(view) {}
  virtual ~FadeInAnimationDelegate() {}

  // AnimationDelegate overrides:
  virtual void AnimationProgressed(const Animation* animation) OVERRIDE {
    view_->layer()->SetOpacity(animation->GetCurrentValue());
    view_->layer()->ScheduleDraw();
  }
  virtual void AnimationEnded(const Animation* animation) OVERRIDE {
    view_->layer()->SetOpacity(1.0f);
    view_->layer()->ScheduleDraw();
  }
  virtual void AnimationCanceled(const 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 views::BoundsAnimator::OwnedAnimationDelegate {
 public:
  FadeOutAnimationDelegate(ShelfView* host, views::View* view)
      : shelf_view_(host),
        view_(view) {}
  virtual ~FadeOutAnimationDelegate() {}

  // AnimationDelegate overrides:
  virtual void AnimationProgressed(const Animation* animation) OVERRIDE {
    view_->layer()->SetOpacity(1 - animation->GetCurrentValue());
    view_->layer()->ScheduleDraw();
  }
  virtual void AnimationEnded(const Animation* animation) OVERRIDE {
    shelf_view_->OnFadeOutAnimationEnded();
  }
  virtual void AnimationCanceled(const 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 views::BoundsAnimator::OwnedAnimationDelegate {
 public:
  StartFadeAnimationDelegate(ShelfView* host,
                             views::View* view)
      : shelf_view_(host),
        view_(view) {}
  virtual ~StartFadeAnimationDelegate() {}

  // AnimationDelegate overrides:
  virtual void AnimationEnded(const Animation* animation) OVERRIDE {
    shelf_view_->FadeIn(view_);
  }
  virtual void AnimationCanceled(const Animation* animation) OVERRIDE {
    view_->layer()->SetOpacity(1.0f);
  }

 private:
  ShelfView* shelf_view_;
  views::View* view_;

  DISALLOW_COPY_AND_ASSIGN(StartFadeAnimationDelegate);
};

ShelfView::ShelfView(ShelfModel* model,
                     ShelfDelegate* delegate,
                     ShelfLayoutManager* manager)
    : model_(model),
      delegate_(delegate),
      view_model_(new views::ViewModel),
      first_visible_index_(0),
      last_visible_index_(-1),
      overflow_button_(NULL),
      owner_overflow_bubble_(NULL),
      drag_pointer_(NONE),
      drag_view_(NULL),
      drag_offset_(0),
      start_drag_index_(-1),
      context_menu_id_(0),
      leading_inset_(kDefaultLeadingInset),
      cancelling_drag_model_changed_(false),
      last_hidden_index_(0),
      closing_event_time_(base::TimeDelta()),
      got_deleted_(NULL),
      drag_and_drop_item_pinned_(false),
      drag_and_drop_shelf_id_(0),
      dragged_off_shelf_(false),
      snap_back_from_rip_off_view_(NULL),
      item_manager_(Shell::GetInstance()->shelf_item_delegate_manager()),
      layout_manager_(manager),
      overflow_mode_(false),
      main_shelf_(NULL),
      dragged_off_from_overflow_to_shelf_(false) {
  DCHECK(model_);
  bounds_animator_.reset(new views::BoundsAnimator(this));
  bounds_animator_->AddObserver(this);
  set_context_menu_controller(this);
  focus_search_.reset(new ShelfFocusSearch(view_model_.get()));
  tooltip_.reset(new ShelfTooltipManager(manager, this));
}

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::Init() {
  model_->AddObserver(this);

  const ShelfItems& items(model_->items());
  for (ShelfItems::const_iterator i = items.begin(); i != items.end(); ++i) {
    views::View* child = CreateViewForItem(*i);
    child->SetPaintToLayer(true);
    view_model_->Add(child, static_cast<int>(i - items.begin()));
    AddChildView(child);
  }
  ShelfStatusChanged();
  overflow_button_ = new OverflowButton(this);
  overflow_button_->set_context_menu_controller(this);
  ConfigureChildView(overflow_button_);
  AddChildView(overflow_button_);
  UpdateFirstButtonPadding();

  // We'll layout when our bounds change.
}

void ShelfView::OnShelfAlignmentChanged() {
  UpdateFirstButtonPadding();
  overflow_button_->OnShelfAlignmentChanged();
  LayoutToIdealBounds();
  for (int i=0; i < view_model_->view_size(); ++i) {
    // TODO: remove when AppIcon is a Shelf Button.
    if (TYPE_APP_LIST == model_->items()[i].type &&
        !ash::switches::UseAlternateShelfLayout()) {
      static_cast<AppListButton*>(view_model_->view_at(i))->SetImageAlignment(
          layout_manager_->SelectValueForShelfAlignment(
              views::ImageButton::ALIGN_CENTER,
              views::ImageButton::ALIGN_LEFT,
              views::ImageButton::ALIGN_RIGHT,
              views::ImageButton::ALIGN_CENTER),
          layout_manager_->SelectValueForShelfAlignment(
              views::ImageButton::ALIGN_TOP,
              views::ImageButton::ALIGN_MIDDLE,
              views::ImageButton::ALIGN_MIDDLE,
              views::ImageButton::ALIGN_BOTTOM));
    }
    if (i >= first_visible_index_ && i <= last_visible_index_)
      view_model_->view_at(i)->Layout();
  }
  tooltip_->Close();
  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();
  }
  if (overflow_button_ && overflow_button_->visible())
    overflow_button_->SchedulePaint();
}

gfx::Rect ShelfView::GetIdealBoundsOfItemIcon(ShelfID id) {
  int index = model_->ItemIndexByID(id);
  if (index == -1 || (index > last_visible_index_ &&
                      index < model_->FirstPanelIndex()))
    return gfx::Rect();
  const gfx::Rect& ideal_bounds(view_model_->ideal_bounds(index));
  DCHECK_NE(TYPE_APP_LIST, model_->items()[index].type);
  ShelfButton* button = static_cast<ShelfButton*>(view_model_->view_at(index));
  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 &&
         layout_manager_->PrimaryAxisValue(
             view_model_->ideal_bounds(target_index).x(),
             view_model_->ideal_bounds(target_index).y()) >
         layout_manager_->PrimaryAxisValue(midpoint_in_view.x(),
                                           midpoint_in_view.y())) {
    --target_index;
  }
  while (target_index < view_model_->view_size() - 1 &&
         layout_manager_->PrimaryAxisValue(
             view_model_->ideal_bounds(target_index).right(),
             view_model_->ideal_bounds(target_index).bottom()) <
         layout_manager_->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 {
  return overflow_bubble_.get() && overflow_bubble_->IsShowing();
}

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 NULL;
}

////////////////////////////////////////////////////////////////////////////////
// ShelfView, FocusTraversable implementation:

views::FocusSearch* ShelfView::GetFocusSearch() {
  return focus_search_.get();
}

views::FocusTraversable* ShelfView::GetFocusTraversableParent() {
  return parent()->GetFocusTraversable();
}

View* ShelfView::GetFocusTraversableParentView() {
  return this;
}

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;
  ash::wm::ConvertPointFromScreen(
      ash::wm::GetRootWindowAt(location_in_screen_coordinates),
      &point_in_root);
  ui::MouseEvent event(ui::ET_MOUSE_PRESSED, pt, point_in_root, 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;
  ash::wm::ConvertPointFromScreen(
      ash::wm::GetRootWindowAt(location_in_screen_coordinates),
      &point_in_root);
  ui::MouseEvent event(ui::ET_MOUSE_DRAGGED, pt, point_in_root, 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;
  }

  IdealBounds ideal_bounds;
  CalculateIdealBounds(&ideal_bounds);
  views::ViewModelUtils::SetViewBoundsToIdealBounds(*view_model_);
  overflow_button_->SetBoundsRect(ideal_bounds.overflow_bounds);
}

void ShelfView::UpdateAllButtonsVisibilityInOverflowMode() {
  // The overflow button is not shown in overflow mode.
  overflow_button_->SetVisible(false);
  int last_button_index = model_->FirstPanelIndex() - 1;
  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_;
    if (!ash::switches::UseAlternateShelfLayout())
      visible &= i != last_button_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);
  }
}

void ShelfView::CalculateIdealBounds(IdealBounds* bounds) {
  int available_size = layout_manager_->PrimaryAxisValue(width(), height());
  DCHECK(model_->item_count() == view_model_->view_size());
  if (!available_size)
    return;

  int first_panel_index = model_->FirstPanelIndex();
  int last_button_index = first_panel_index - 1;

  // Initial x,y values account both leading_inset in primary
  // coordinate and secondary coordinate based on the dynamic edge of the
  // shelf (eg top edge on bottom-aligned shelf).
  int inset = ash::switches::UseAlternateShelfLayout() ? 0 : leading_inset_;
  int x = layout_manager_->SelectValueForShelfAlignment(inset, 0, 0, inset);
  int y = layout_manager_->SelectValueForShelfAlignment(0, inset, inset, 0);

  int button_size = GetButtonSize();
  int button_spacing = GetButtonSpacing();

  int w = layout_manager_->PrimaryAxisValue(button_size, width());
  int h = layout_manager_->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));
    if (i != last_button_index) {
      x = layout_manager_->PrimaryAxisValue(x + w + button_spacing, x);
      y = layout_manager_->PrimaryAxisValue(y, y + h + button_spacing);
    }
  }

  if (is_overflow_mode()) {
    UpdateAllButtonsVisibilityInOverflowMode();
    return;
  }

  // To address Fitt's law, we make the first shelf button include the
  // leading inset (if there is one).
  if (!ash::switches::UseAlternateShelfLayout()) {
    if (view_model_->view_size() > 0) {
      view_model_->set_ideal_bounds(0, gfx::Rect(gfx::Size(
          layout_manager_->PrimaryAxisValue(inset + w, w),
          layout_manager_->PrimaryAxisValue(h, inset + h))));
    }
  }

  // Right aligned icons.
  int end_position = available_size - button_spacing;
  x = layout_manager_->PrimaryAxisValue(end_position, 0);
  y = layout_manager_->PrimaryAxisValue(0, end_position);
  for (int i = view_model_->view_size() - 1;
       i >= first_panel_index; --i) {
    x = layout_manager_->PrimaryAxisValue(x - w - button_spacing, x);
    y = layout_manager_->PrimaryAxisValue(y, y - h - button_spacing);
    view_model_->set_ideal_bounds(i, gfx::Rect(x, y, w, h));
    end_position = layout_manager_->PrimaryAxisValue(x, y);
  }

  // Icons on the left / top are guaranteed up to kLeftIconProportion of
  // the available space.
  int last_icon_position = layout_manager_->PrimaryAxisValue(
      view_model_->ideal_bounds(last_button_index).right(),
      view_model_->ideal_bounds(last_button_index).bottom())
      + button_size + inset;
  if (!ash::switches::UseAlternateShelfLayout())
      last_icon_position += 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);

  bounds->overflow_bounds.set_size(
      gfx::Size(layout_manager_->PrimaryAxisValue(w, width()),
                layout_manager_->PrimaryAxisValue(height(), h)));

  if (ash::switches::UseAlternateShelfLayout()) {
    last_visible_index_ = DetermineLastVisibleIndex(
        end_position - button_size);
  } else {
    last_visible_index_ = DetermineLastVisibleIndex(
        end_position - inset - 2 * button_size);
  }
  last_hidden_index_ = DetermineFirstVisiblePanelIndex(end_position) - 1;
  bool show_overflow =
      ((ash::switches::UseAlternateShelfLayout() ? 0 : 1) +
      last_visible_index_ < last_button_index ||
      last_hidden_index_ >= first_panel_index);

  // Create Space for the overflow button
  if (show_overflow && ash::switches::UseAlternateShelfLayout() &&
      last_visible_index_ > 0 && last_visible_index_ < last_button_index)
    --last_visible_index_;
  for (int i = 0; i < view_model_->view_size(); ++i) {
    bool visible = i <= last_visible_index_ || i > last_hidden_index_;
    // Always show the app list.
    if (!ash::switches::UseAlternateShelfLayout())
      visible |= (i == last_button_index);
    // To receive drag event continously 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);
  }

  overflow_button_->SetVisible(show_overflow);
  if (show_overflow) {
    DCHECK_NE(0, view_model_->view_size());
    if (last_visible_index_ == -1) {
      x = layout_manager_->SelectValueForShelfAlignment(inset, 0, 0, inset);
      y = layout_manager_->SelectValueForShelfAlignment(0, inset, inset, 0);
    } else if (last_visible_index_ == last_button_index
        && !ash::switches::UseAlternateShelfLayout()) {
      x = view_model_->ideal_bounds(last_visible_index_).x();
      y = view_model_->ideal_bounds(last_visible_index_).y();
    } else {
      x = layout_manager_->PrimaryAxisValue(
          view_model_->ideal_bounds(last_visible_index_).right(),
          view_model_->ideal_bounds(last_visible_index_).x());
      y = layout_manager_->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.
    if (ash::switches::UseAlternateShelfLayout()) {
      x = layout_manager_->PrimaryAxisValue(x + button_spacing, x);
      y = layout_manager_->PrimaryAxisValue(y, y + button_spacing);
    }

    bounds->overflow_bounds.set_x(x);
    bounds->overflow_bounds.set_y(y);
    if (!ash::switches::UseAlternateShelfLayout()) {
      // Position app list after overflow button.
      gfx::Rect app_list_bounds = view_model_->ideal_bounds(last_button_index);

      x = layout_manager_->PrimaryAxisValue(x + w + button_spacing, x);
      y = layout_manager_->PrimaryAxisValue(y, y + h + button_spacing);
      app_list_bounds.set_x(x);
      app_list_bounds.set_y(y);
      view_model_->set_ideal_bounds(last_button_index, app_list_bounds);
    }
    if (overflow_bubble_.get() && overflow_bubble_->IsShowing())
      UpdateOverflowRange(overflow_bubble_->shelf_view());
  } else {
    if (overflow_bubble_)
      overflow_bubble_->Hide();
  }
}

int ShelfView::DetermineLastVisibleIndex(int max_value) const {
  int index = model_->FirstPanelIndex() - 1;
  while (index >= 0 &&
         layout_manager_->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() &&
         layout_manager_->PrimaryAxisValue(
             view_model_->ideal_bounds(index).right(),
             view_model_->ideal_bounds(index).bottom()) < min_value) {
    ++index;
  }
  return index;
}

void ShelfView::AddIconObserver(ShelfIconObserver* observer) {
  observers_.AddObserver(observer);
}

void ShelfView::RemoveIconObserver(ShelfIconObserver* observer) {
  observers_.RemoveObserver(observer);
}

void ShelfView::AnimateToIdealBounds() {
  IdealBounds ideal_bounds;
  CalculateIdealBounds(&ideal_bounds);
  for (int i = 0; i < view_model_->view_size(); ++i) {
    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());
    else if (!i && !view->border())
      UpdateFirstButtonPadding();
  }
  overflow_button_->SetBoundsRect(ideal_bounds.overflow_bounds);
}

views::View* ShelfView::CreateViewForItem(const ShelfItem& item) {
  views::View* view = NULL;
  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, layout_manager_);
      button->SetImage(item.image);
      ReflectItemStatus(item, button);
      view = button;
      break;
    }

    case TYPE_APP_LIST: {
      if (ash::switches::UseAlternateShelfLayout()) {
        view = new AlternateAppListButton(this,
                                          this,
                                          layout_manager_->shelf_widget());
      } else {
        // TODO(dave): turn this into a ShelfButton too.
        AppListButton* button = new AppListButton(this, this);
        button->SetImageAlignment(
            layout_manager_->SelectValueForShelfAlignment(
                views::ImageButton::ALIGN_CENTER,
                views::ImageButton::ALIGN_LEFT,
                views::ImageButton::ALIGN_RIGHT,
                views::ImageButton::ALIGN_CENTER),
            layout_manager_->SelectValueForShelfAlignment(
                views::ImageButton::ALIGN_TOP,
                views::ImageButton::ALIGN_MIDDLE,
                views::ImageButton::ALIGN_MIDDLE,
                views::ImageButton::ALIGN_BOTTOM));
        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, new FadeInAnimationDelegate(view), true);
}

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.
  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);

  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 (layout_manager_->IsHorizontalAlignment()) {
    x = std::max(view_model_->ideal_bounds(indices.first).x(),
                     drag_point.x() - drag_offset_);
    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_offset_);
    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_,
          layout_manager_->IsHorizontalAlignment() ?
              views::ViewModelUtils::HORIZONTAL :
              views::ViewModelUtils::VERTICAL,
          x, y);
  target_index =
      std::min(indices.second, std::max(target_index, indices.first));
  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) {
  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();
  ash::wm::ConvertPointToScreen(GetWidget()->GetNativeWindow()->GetRootWindow(),
                                &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.
    ShelfButton* button = static_cast<ShelfButton*>(drag_view_);
    CreateDragIconProxy(event.root_location(),
                        button->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) {
  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 =
          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 = 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_;
      ShelfButton* button = static_cast<ShelfButton*>(drag_view_);
      button->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) {
  DCHECK(index >= 0 && index < model_->item_count());
  ShelfItemType type = model_->items()[index].type;
  if (type == TYPE_APP_LIST || type == TYPE_DIALOG || !delegate_->CanPin())
    return NOT_REMOVABLE;

  std::string app_id = delegate_->GetAppIDForShelfID(model_->items()[index].id);
  // Note: Only pinned app shortcuts can be removed!
  return (type == TYPE_APP_SHORTCUT && delegate_->IsAppPinned(app_id)) ?
      REMOVABLE : DRAGGABLE;
}

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_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() {
  if (IsShowingOverflowBubble()) {
    overflow_bubble_->Hide();
    return;
  }

  if (!overflow_bubble_)
    overflow_bubble_.reset(new OverflowBubble());

  ShelfView* overflow_view =
      new ShelfView(model_, delegate_, layout_manager_);
  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::UpdateFirstButtonPadding() {
  if (ash::switches::UseAlternateShelfLayout())
    return;

  // Creates an empty border for first shelf button to make included leading
  // inset act as the button's padding. This is only needed on button creation
  // and when shelf alignment changes.
  if (view_model_->view_size() > 0) {
    view_model_->view_at(0)->SetBorder(views::Border::CreateEmptyBorder(
        layout_manager_->PrimaryAxisValue(0, leading_inset_),
        layout_manager_->PrimaryAxisValue(leading_inset_, 0),
        0,
        0));
  }
}

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.
  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,
        new ShelfView::StartFadeAnimationDelegate(this, last_visible_view),
        true);
  }
}

void ShelfView::UpdateOverflowRange(ShelfView* overflow_view) {
  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());

  overflow_view->first_visible_index_ = first_overflow_index;
  overflow_view->last_visible_index_ = last_overflow_index;
}

int ShelfView::GetButtonSize() const {
  return ash::switches::UseAlternateShelfLayout() ?
      kButtonSize : kShelfPreferredSize;
}

int ShelfView::GetButtonSpacing() const {
  return ash::switches::UseAlternateShelfLayout() ?
      kAlternateButtonSpacing : kButtonSpacing;
}

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);
    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()) {
    DCHECK(owner_overflow_bubble_);
    gfx::Rect bubble_bounds =
        owner_overflow_bubble_->bubble_view()->GetBubbleBounds();
    preferred_size = bubble_bounds.size();
  } else {
    const int preferred_shelf_size = layout_manager_->GetPreferredShelfSize();

    const int last_button_index = view_model_->view_size() - 1;
    gfx::Rect last_button_bounds =
        view_model_->view_at(last_button_index)->bounds();
    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 (layout_manager_->IsHorizontalAlignment()) {
      preferred_size = gfx::Size(last_button_bounds.right() + leading_inset_,
                                 preferred_shelf_size);
    } else {
      preferred_size = gfx::Size(preferred_shelf_size,
                                 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.
  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_ = NULL;
  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) : NULL;
  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() {
  IdealBounds ideal_bounds;
  CalculateIdealBounds(&ideal_bounds);

  const int preferred_size = layout_manager_->GetPreferredShelfSize();

  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(preferred_size, preferred_size));

  if (layout_manager_->IsHorizontalAlignment()) {
    return gfx::Size(last_button_bounds.right() + leading_inset_,
                     preferred_size);
  }

  return gfx::Size(preferred_size,
                   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();
  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;
  state->name = l10n_util::GetStringUTF16(IDS_ASH_SHELF_ACCESSIBLE_NAME);
}

void ShelfView::OnGestureEvent(ui::GestureEvent* event) {
  if (gesture_handler_.ProcessGestureEvent(*event))
    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).
  IdealBounds ideal_bounds;
  CalculateIdealBounds(&ideal_bounds);
  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, new StartFadeAnimationDelegate(this, view), true);
  } 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.
  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, new FadeOutAnimationDelegate(this, view), true);
  } 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: {
      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;
    }

    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() {
  if (ash::switches::UseAlternateShelfLayout())
    return;
  AppListButton* app_list_button =
      static_cast<AppListButton*>(GetAppListButtonView());
  if (model_->status() == ShelfModel::STATUS_LOADING)
    app_list_button->StartLoadingAnimation();
  else
    app_list_button->StopLoadingAnimation();
}

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;

  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.

  drag_view_ = view;
  drag_offset_ = layout_manager_->PrimaryAxisValue(event.x(), event.y());
  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_ &&
      ((abs(event.x() - drag_offset_) >= kMinimumDragDistance) ||
       (abs(event.y() - drag_offset_) >= kMinimumDragDistance))) {
    PrepareForDrag(pointer, event);
  }
  if (drag_pointer_ == pointer)
    ContinueDrag(event);
}

void ShelfView::PointerReleasedOnButton(views::View* view,
                                        Pointer pointer,
                                        bool canceled) {
  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_ = NULL;
}

void ShelfView::MouseMovedOverButton(views::View* view) {
  if (!ShouldShowTooltipForView(view))
    return;

  if (!tooltip_->IsVisible())
    tooltip_->ResetTimer();
}

void ShelfView::MouseEnteredButton(views::View* view) {
  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();

  ShelfItemDelegate* item_delegate = item_manager_->GetShelfItemDelegate(
      model_->items()[view_index].id);
  return item_delegate->GetTitle();
}

void ShelfView::ButtonPressed(views::Button* sender, const ui::Event& event) {
  // Do not handle mouse release during drag.
  if (dragging())
    return;

  if (sender == overflow_button_) {
    ToggleOverflowBubble();
    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 previous menu was closed by the same event as this one, we ignore
  // the call.
  if (!IsUsableEvent(event))
    return;

  {
    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.
    switch (model_->items()[view_index].type) {
      case TYPE_APP_SHORTCUT:
      case TYPE_WINDOWED_APP:
      case TYPE_PLATFORM_APP:
      case TYPE_BROWSER_SHORTCUT:
        Shell::GetInstance()->metrics()->RecordUserMetricsAction(
            UMA_LAUNCHER_CLICK_ON_APP);
        break;

      case TYPE_APP_LIST:
        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;
    }

    ShelfItemDelegate* item_delegate =
        item_manager_->GetShelfItemDelegate(model_->items()[view_index].id);
    if (!item_delegate->ItemSelected(event))
      ShowListMenuForView(model_->items()[view_index], sender, event);
  }
}

bool ShelfView::ShowListMenuForView(const ShelfItem& item,
                                    views::View* source,
                                    const ui::Event& event) {
  scoped_ptr<ShelfMenuModel> menu_model;
  ShelfItemDelegate* item_delegate =
      item_manager_->GetShelfItemDelegate(item.id);
  menu_model.reset(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 (!menu_model.get() || menu_model->GetItemCount() <= 5)
    return false;

  ShowMenu(scoped_ptr<views::MenuModelAdapter>(
               new ShelfMenuModelAdapter(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) {
    Shell::GetInstance()->ShowContextMenu(point, source_type);
    return;
  }

  scoped_ptr<ui::MenuModel> menu_model;
  ShelfItemDelegate* item_delegate = item_manager_->GetShelfItemDelegate(
      model_->items()[view_index].id);
  menu_model.reset(item_delegate->CreateContextMenu(
      source->GetWidget()->GetNativeView()->GetRootWindow()));
  if (!menu_model)
    return;

  base::AutoReset<ShelfID> reseter(
      &context_menu_id_,
      view_index == -1 ? 0 : model_->items()[view_index].id);

  ShowMenu(scoped_ptr<views::MenuModelAdapter>(
               new views::MenuModelAdapter(menu_model.get())),
           source,
           point,
           true,
           source_type);
}

void ShelfView::ShowMenu(scoped_ptr<views::MenuModelAdapter> menu_model_adapter,
                         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_adapter->CreateMenu()));

  ScopedTargetRootWindow scoped_target(
      source->GetWidget()->GetNativeView()->GetRootWindow());

  // Determine the menu alignment dependent on the shelf.
  views::MenuItemView::AnchorPosition menu_alignment =
      views::MenuItemView::TOPLEFT;
  gfx::Rect anchor_point = gfx::Rect(click_point, gfx::Size());

  ShelfWidget* shelf = RootWindowController::ForShelf(
      GetWidget()->GetNativeView())->shelf();
  if (!context_menu) {
    // Application lists use a bubble.
    ShelfAlignment align = shelf->GetAlignment();
    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());

    switch (align) {
      case SHELF_ALIGNMENT_BOTTOM:
        menu_alignment = views::MenuItemView::BUBBLE_ABOVE;
        break;
      case SHELF_ALIGNMENT_LEFT:
        menu_alignment = views::MenuItemView::BUBBLE_RIGHT;
        break;
      case SHELF_ALIGNMENT_RIGHT:
        menu_alignment = views::MenuItemView::BUBBLE_LEFT;
        break;
      case SHELF_ALIGNMENT_TOP:
        menu_alignment = views::MenuItemView::BUBBLE_BELOW;
        break;
    }
  }
  // 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;

  shelf->ForceUndimming(true);
  // NOTE: if you convert to HAS_MNEMONICS be sure and update menu building
  // code.
  if (launcher_menu_runner_->RunMenuAt(
          source->GetWidget(),
          NULL,
          anchor_point,
          menu_alignment,
          source_type,
          context_menu ? views::MenuRunner::CONTEXT_MENU : 0) ==
      views::MenuRunner::MENU_DELETED) {
    if (!got_deleted) {
      got_deleted_ = NULL;
      shelf->ForceUndimming(false);
    }
    return;
  }
  got_deleted_ = NULL;
  shelf->ForceUndimming(false);

  // If it is a context menu and we are showing overflow bubble
  // we want to hide overflow bubble.
  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();
  Shell::GetInstance()->UpdateShelfVisibility();
}

void ShelfView::OnBoundsAnimatorProgressed(views::BoundsAnimator* animator) {
  FOR_EACH_OBSERVER(ShelfIconObserver, observers_,
                    OnShelfIconPositionsChanged());
  PreferredSizeChanged();
}

void ShelfView::OnBoundsAnimatorDone(views::BoundsAnimator* animator) {
  if (snap_back_from_rip_off_view_ && animator == bounds_animator_) {
    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_) {
          ShelfButton* button = static_cast<ShelfButton*>(view);
          button->ClearState(ShelfButton::STATE_HIDDEN);
          break;
        }
      }
      snap_back_from_rip_off_view_ = NULL;
    }
  }
}

bool ShelfView::IsUsableEvent(const ui::Event& event) {
  if (closing_event_time_ == base::TimeDelta())
    return true;

  base::TimeDelta delta =
      base::TimeDelta(event.time_stamp() - closing_event_time_);
  closing_event_time_ = base::TimeDelta();
  // TODO(skuhne): This time seems excessive, but it appears that the reposting
  // takes that long.  Need to come up with a better way of doing this.
  return (delta.InMilliseconds() < 0 || delta.InMilliseconds() > 130);
}

const ShelfItem* ShelfView::ShelfItemForView(const views::View* view) const {
  int view_index = view_model_->GetIndexOfView(view);
  if (view_index == -1)
    return NULL;
  return &(model_->items()[view_index]);
}

bool ShelfView::ShouldShowTooltipForView(const views::View* view) const {
  if (view == GetAppListButtonView() &&
      Shell::GetInstance()->GetAppListWindow())
    return false;
  const ShelfItem* item = ShelfItemForView(view);
  if (!item)
    return true;
  ShelfItemDelegate* item_delegate =
      item_manager_->GetShelfItemDelegate(item->id);
  return item_delegate->ShouldShowTooltip();
}

int ShelfView::CalculateShelfDistance(const gfx::Point& coordinate) const {
  ShelfWidget* shelf = RootWindowController::ForShelf(
      GetWidget()->GetNativeView())->shelf();
  ShelfAlignment align = shelf->GetAlignment();
  const gfx::Rect bounds = GetBoundsInScreen();
  int distance = 0;
  switch (align) {
    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 ash
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root/ash/shelf/shelf_view.cc

DEFINITIONS
