Cros: Add ripple effect to pagination on folder

The page switcher buttons on the folder view didn't show the ripple
effect when hovered, as opposed to the page switcher on the app list.
This change adds the effect to be consistent

Bug: 998388
Change-Id: I49e48680a9bb4106e069c0e031b1e43c7c120794
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816982
Commit-Queue: Ana Salazar <anasalazar@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698661}

ash/app_list/views/app_list_folder_view.cc

@@ -724,10 +724,15 @@ void AppListFolderView::CalculateIdealBounds() {
   // Calculate bounds for page_switcher.
   gfx::Rect page_switcher_frame(rect);
   gfx::Size page_switcher_size = page_switcher_->GetPreferredSize();
-  page_switcher_size.set_height(GetAppListConfig().folder_header_height());
   page_switcher_frame.set_x(page_switcher_frame.right() -
                             page_switcher_size.width());
-  page_switcher_frame.set_y(header_frame.y());
+  // The page switcher has a different height than the folder header, but it
+  // still needs to be aligned with it.
+  const int y_switcher_position =
+      header_frame.y() - (page_switcher_size.height() -
+                          GetAppListConfig().folder_header_height()) /
+                             2;
+  page_switcher_frame.set_y(y_switcher_position);
   page_switcher_frame.set_size(page_switcher_size);
   view_model_->set_ideal_bounds(kIndexPageSwitcher, page_switcher_frame);
 }

ash/app_list/views/page_switcher.cc

@@ -42,27 +42,31 @@ constexpr SkScalar kStrokeWidth = SkIntToScalar(2);
 // The padding on top/bottom side of each button.
 constexpr int kVerticalButtonPadding = 0;
 // The selected button color.
-constexpr SkColor kVerticalSelectedButtonColor =
-    SkColorSetARGB(255, 232, 234, 237);
-// The normal button color (54% white).
-constexpr SkColor kVerticalNormalColor = SkColorSetARGB(255, 232, 234, 237);
-constexpr SkColor kVerticalInkDropBaseColor = SkColorSetRGB(241, 243, 244);
-constexpr SkColor kVerticalInkDropRippleColor =
-    SkColorSetA(kVerticalInkDropBaseColor, 15);
-constexpr SkColor kVerticalInkDropHighlightColor =
-    SkColorSetA(kVerticalInkDropBaseColor, 20);
+constexpr SkColor kDarkSelectedButtonColor = SkColorSetARGB(255, 232, 234, 237);
+// The normal button color for the page switcher shown in the app grid (54%
+// white).
+constexpr SkColor kDarkNormalColor = SkColorSetARGB(255, 232, 234, 237);
+constexpr SkColor kDarkInkDropBaseColor = SkColorSetRGB(241, 243, 244);
+constexpr SkColor kDarkInkDropRippleColor =
+    SkColorSetA(kDarkInkDropBaseColor, 15);
+constexpr SkColor kDarkInkDropHighlightColor =
+    SkColorSetA(kDarkInkDropBaseColor, 20);
 
 // Constants for the button strip that grows horizontally.
 // The padding on left/right side of each button.
 constexpr int kHorizontalButtonPadding = 6;
-// The normal button color (54% black).
-constexpr SkColor kHorizontalNormalColor = SkColorSetA(SK_ColorBLACK, 138);
+// The normal button color for the page switcher shown in folders (54% black).
+constexpr SkColor kLightNormalColor = SkColorSetA(SK_ColorBLACK, 138);
+constexpr SkColor kLightInkDropBaseColor = SkColorSetARGB(255, 95, 99, 104);
+constexpr SkColor kLightInkDropRippleColor =
+    SkColorSetA(kLightInkDropBaseColor, 8);
+constexpr SkColor kLightInkDropHighlightColor =
+    SkColorSetA(kLightInkDropBaseColor, 24);
 
 class PageSwitcherButton : public views::Button {
  public:
   PageSwitcherButton(views::ButtonListener* listener, bool vertical)
       : views::Button(listener), vertical_(vertical) {
-    if (vertical)
     SetInkDropMode(InkDropMode::ON);
   }
 
@@ -111,7 +115,8 @@ class PageSwitcherButton : public views::Button {
                      2 * PageSwitcher::kMaxButtonRadius);
     return std::make_unique<views::FloodFillInkDropRipple>(
         size(), GetLocalBounds().InsetsFrom(bounds),
-        GetInkDropCenterBasedOnLastEvent(), kVerticalInkDropRippleColor, 1.0f);
+        GetInkDropCenterBasedOnLastEvent(),
+        vertical_ ? kDarkInkDropRippleColor : kLightInkDropRippleColor, 1.0f);
   }
 
   std::unique_ptr<views::InkDropHighlight> CreateInkDropHighlight()
@@ -119,7 +124,9 @@ class PageSwitcherButton : public views::Button {
     return std::make_unique<views::InkDropHighlight>(
         gfx::PointF(GetLocalBounds().CenterPoint()),
         std::make_unique<views::CircleLayerDelegate>(
-            kVerticalInkDropHighlightColor, kInkDropRadius));
+            vertical_ ? kDarkInkDropHighlightColor
+                      : kLightInkDropHighlightColor,
+            kInkDropRadius));
   }
 
   void NotifyClick(const ui::Event& event) override {
@@ -140,13 +147,12 @@ class PageSwitcherButton : public views::Button {
   PaintButtonInfo BuildPaintButtonInfo() {
     PaintButtonInfo info;
     if (selected_) {
-      info.color =
-          vertical_ ? kVerticalSelectedButtonColor : kHorizontalNormalColor;
+      info.color = vertical_ ? kDarkSelectedButtonColor : kLightNormalColor;
       info.style = cc::PaintFlags::kFill_Style;
       info.radius = SkIntToScalar(kSelectedButtonRadius);
       info.stroke_width = SkIntToScalar(0);
     } else {
-      info.color = vertical_ ? kVerticalNormalColor : kHorizontalNormalColor;
+      info.color = vertical_ ? kDarkNormalColor : kLightNormalColor;
       info.style = cc::PaintFlags::kStroke_Style;
       info.radius = SkIntToScalar(kNormalButtonRadius);
       info.stroke_width = kStrokeWidth;