Replace AllAppsTileItemView with ArrowExpandView

ui/app_list/views/expand_arrow_view.cc

Index: ui/app_list/views/expand_arrow_view.cc
diff --git a/ui/app_list/views/expand_arrow_view.cc b/ui/app_list/views/expand_arrow_view.cc
new file mode 100644
index 0000000000000000000000000000000000000000..632d3e1855e48ba3cfaf3e8ec641cc88d4522eab
--- /dev/null
+++ b/ui/app_list/views/expand_arrow_view.cc
@@ -0,0 +1,108 @@
+// Copyright 2017 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 "ui/app_list/views/expand_arrow_view.h"
+
+#include "base/metrics/histogram_macros.h"
+#include "ui/app_list/app_list_constants.h"
+#include "ui/app_list/vector_icons/vector_icons.h"
+#include "ui/app_list/views/app_list_view.h"
+#include "ui/app_list/views/contents_view.h"
+#include "ui/gfx/paint_vector_icon.h"
+#include "ui/views/animation/flood_fill_ink_drop_ripple.h"
+#include "ui/views/animation/ink_drop_highlight.h"
+#include "ui/views/animation/ink_drop_impl.h"
+#include "ui/views/animation/ink_drop_mask.h"
+#include "ui/views/animation/ink_drop_painted_layer_delegates.h"
+#include "ui/views/controls/image_view.h"
+
+namespace app_list {
+
+namespace {
+
+constexpr int kExpandArrowTileSize = 36;
+constexpr int kExpandArrowIconSize = 12;
+constexpr int kInkDropRadius = 18;
+
+constexpr SkColor kExpandArrowColor = SK_ColorWHITE;
+constexpr SkColor kInkDropRippleColor =
+    SkColorSetARGBMacro(0x14, 0xFF, 0xFF, 0xFF);
+constexpr SkColor kInkDropHighlightColor =
+    SkColorSetARGBMacro(0xF, 0xFF, 0xFF, 0xFF);
+
+}  // namespace
+
+ExpandArrowView::ExpandArrowView(ContentsView* contents_view,
+                                 AppListView* app_list_view)
+    : views::CustomButton(this),
+      contents_view_(contents_view),
+      app_list_view_(app_list_view) {
+  icon_ = new views::ImageView;
+  icon_->SetVerticalAlignment(views::ImageView::CENTER);
+  icon_->SetImage(gfx::CreateVectorIcon(kIcArrowUpIcon, kExpandArrowIconSize,
+                                        kExpandArrowColor));
+  AddChildView(icon_);
+
+  SetInkDropMode(InkDropHostView::InkDropMode::ON);
+}
+
+ExpandArrowView::~ExpandArrowView() {}
+
+void ExpandArrowView::ButtonPressed(views::Button* sender,
+                                    const ui::Event& event) {
+  UMA_HISTOGRAM_ENUMERATION(kPageOpenedHistogram, AppListModel::STATE_APPS,
+                            AppListModel::STATE_LAST);
+
+  contents_view_->SetActiveState(AppListModel::STATE_APPS);
+  app_list_view_->SetState(AppListView::FULLSCREEN_ALL_APPS);
+  GetInkDrop()->AnimateToState(views::InkDropState::ACTION_TRIGGERED);
+}
+
+gfx::Size ExpandArrowView::CalculatePreferredSize() const {
+  return gfx::Size(kExpandArrowTileSize, kExpandArrowTileSize);
+}
+
+void ExpandArrowView::Layout() {
+  gfx::Rect rect(GetContentsBounds());
+  gfx::Point center = rect.CenterPoint();
+  rect.SetRect(center.x() - kExpandArrowIconSize / 2,
+               center.y() - kExpandArrowIconSize / 2, kExpandArrowIconSize,
+               kExpandArrowIconSize);
+  icon_->SetBoundsRect(rect);
+}
+
+std::unique_ptr<views::InkDrop> ExpandArrowView::CreateInkDrop() {
+  std::unique_ptr<views::InkDropImpl> ink_drop =
+      CustomButton::CreateDefaultInkDropImpl();
+  ink_drop->SetShowHighlightOnHover(false);
+  ink_drop->SetShowHighlightOnFocus(true);
+  ink_drop->SetAutoHighlightMode(
+      views::InkDropImpl::AutoHighlightMode::SHOW_ON_RIPPLE);
+  return std::move(ink_drop);
+}
+
+std::unique_ptr<views::InkDropMask> ExpandArrowView::CreateInkDropMask() const {
+  return base::MakeUnique<views::CircleInkDropMask>(
+      size(), GetLocalBounds().CenterPoint(), kInkDropRadius);
+}
+
+std::unique_ptr<views::InkDropRipple> ExpandArrowView::CreateInkDropRipple()
+    const {
+  gfx::Point center = GetLocalBounds().CenterPoint();
+  gfx::Rect bounds(center.x() - kInkDropRadius, center.y() - kInkDropRadius,
+                   2 * kInkDropRadius, 2 * kInkDropRadius);
+  return base::MakeUnique<views::FloodFillInkDropRipple>(
+      size(), GetLocalBounds().InsetsFrom(bounds),
+      GetInkDropCenterBasedOnLastEvent(), kInkDropRippleColor, 1.0f);
+}
+
+std::unique_ptr<views::InkDropHighlight>
+ExpandArrowView::CreateInkDropHighlight() const {
+  return base::MakeUnique<views::InkDropHighlight>(
+      gfx::PointF(GetLocalBounds().CenterPoint()),
+      base::MakeUnique<views::CircleLayerDelegate>(kInkDropHighlightColor,
+                                                   kInkDropRadius));
+}
+
+}  // namespace app_list