From 1a8f6fb736c36548a44db6c7018771e3a895dda0 Mon Sep 17 00:00:00 2001
From: Sunny Goyal <sunnygoyal@google.com>
Date: Wed, 14 Jun 2017 15:35:16 -0700
Subject: [PATCH] Updating the fast scroll bar UI

Bug: 37015359
Change-Id: Iec0748f04ebe9a3eef13ff759da3cab6ff28c3a1
---
 .../container_fastscroll_popup_bg.xml         | 27 ------
 .../container_fastscroll_popup_bg.xml         | 27 ------
 res/layout/all_apps.xml                       |  6 +-
 res/layout/all_apps_discovery_item.xml        |  4 +-
 .../all_apps_discovery_loading_divider.xml    |  4 +-
 res/layout/all_apps_divider.xml               |  4 +-
 res/layout/all_apps_search_divider.xml        |  4 +-
 res/layout/all_apps_search_market.xml         |  4 +-
 res/layout/widgets_view.xml                   |  2 +-
 res/values-land/dimens.xml                    | 15 +++-
 res/values-sw720dp/dimens.xml                 |  8 +-
 res/values/dimens.xml                         | 20 +++--
 res/values/styles.xml                         |  8 +-
 .../android/launcher3/BaseRecyclerView.java   |  7 --
 .../BaseRecyclerViewFastScrollBar.java        | 52 +++++------
 .../allapps/AllAppsRecyclerView.java          |  8 +-
 .../graphics/FastScrollThumbDrawable.java     | 89 +++++++++++++++++++
 .../launcher3/widget/WidgetsRecyclerView.java |  4 -
 18 files changed, 161 insertions(+), 132 deletions(-)
 delete mode 100644 res/drawable-ldrtl/container_fastscroll_popup_bg.xml
 delete mode 100644 res/drawable/container_fastscroll_popup_bg.xml
 create mode 100644 src/com/android/launcher3/graphics/FastScrollThumbDrawable.java

diff --git a/res/drawable-ldrtl/container_fastscroll_popup_bg.xml b/res/drawable-ldrtl/container_fastscroll_popup_bg.xml
deleted file mode 100644
index 2bbf5cd72a..0000000000
--- a/res/drawable-ldrtl/container_fastscroll_popup_bg.xml
+++ /dev/null
@@ -1,27 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-     Copyright (C) 2015 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-<shape xmlns:android="http://schemas.android.com/apk/res/android"
-       android:shape="rectangle">
-    <solid android:color="?android:attr/colorAccent" />
-    <size
-        android:width="64dp"
-        android:height="64dp" />
-    <corners
-        android:topLeftRadius="64dp"
-        android:topRightRadius="64dp"
-        android:bottomRightRadius="64dp" />
-</shape>
\ No newline at end of file
diff --git a/res/drawable/container_fastscroll_popup_bg.xml b/res/drawable/container_fastscroll_popup_bg.xml
deleted file mode 100644
index 3dc76800b0..0000000000
--- a/res/drawable/container_fastscroll_popup_bg.xml
+++ /dev/null
@@ -1,27 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-     Copyright (C) 2015 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-<shape xmlns:android="http://schemas.android.com/apk/res/android"
-       android:shape="rectangle">
-    <solid android:color="?android:attr/colorAccent" />
-    <size
-        android:width="64dp"
-        android:height="64dp" />
-    <corners
-        android:topLeftRadius="64dp"
-        android:topRightRadius="64dp"
-        android:bottomLeftRadius="64dp" />
-</shape>
\ No newline at end of file
diff --git a/res/layout/all_apps.xml b/res/layout/all_apps.xml
index 09b965544b..ff605f4bb8 100644
--- a/res/layout/all_apps.xml
+++ b/res/layout/all_apps.xml
@@ -54,8 +54,8 @@
             android:overScrollMode="never"
             android:descendantFocusability="afterDescendants"
             android:focusable="true"
-            android:paddingStart="@dimen/container_fastscroll_thumb_max_width"
-            android:paddingEnd="@dimen/container_fastscroll_thumb_max_width" />
+            android:paddingStart="@dimen/dynamic_grid_edge_margin"
+            android:paddingEnd="@dimen/dynamic_grid_edge_margin" />
 
         <!-- Fast scroller popup -->
         <TextView
@@ -63,7 +63,7 @@
             android:layout_alignTop="@+id/apps_list_view"
             android:id="@+id/fast_scroller_popup"
             android:layout_alignParentEnd="true"
-            android:layout_marginEnd="@dimen/container_fastscroll_popup_margin" />
+            android:layout_marginEnd="@dimen/fastscroll_popup_margin" />
 
         <!-- Note: we are reusing/repurposing a system attribute for search layout, because of a
          platform bug, which prevents using custom attributes in <include> tag -->
diff --git a/res/layout/all_apps_discovery_item.xml b/res/layout/all_apps_discovery_item.xml
index fb1755c6b5..728283fc11 100644
--- a/res/layout/all_apps_discovery_item.xml
+++ b/res/layout/all_apps_discovery_item.xml
@@ -94,8 +94,8 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentBottom="true"
-        android:paddingLeft="@dimen/container_fastscroll_thumb_max_width"
-        android:paddingRight="@dimen/container_fastscroll_thumb_max_width"
+        android:paddingLeft="@dimen/dynamic_grid_edge_margin"
+        android:paddingRight="@dimen/dynamic_grid_edge_margin"
         android:src="@drawable/all_apps_divider"
         android:scaleType="fitXY"
         android:focusable="false" />
diff --git a/res/layout/all_apps_discovery_loading_divider.xml b/res/layout/all_apps_discovery_loading_divider.xml
index 1ad5521422..005847c541 100644
--- a/res/layout/all_apps_discovery_loading_divider.xml
+++ b/res/layout/all_apps_discovery_loading_divider.xml
@@ -16,8 +16,8 @@
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="6dp"
-    android:paddingLeft="@dimen/container_fastscroll_thumb_max_width"
-    android:paddingRight="@dimen/container_fastscroll_thumb_max_width">
+    android:paddingLeft="@dimen/dynamic_grid_edge_margin"
+    android:paddingRight="@dimen/dynamic_grid_edge_margin">
 
     <ProgressBar
         android:id="@+id/loadingProgressBar"
diff --git a/res/layout/all_apps_divider.xml b/res/layout/all_apps_divider.xml
index 1eaf685c46..8a4f646646 100644
--- a/res/layout/all_apps_divider.xml
+++ b/res/layout/all_apps_divider.xml
@@ -19,8 +19,8 @@
     android:layout_height="wrap_content"
     android:paddingTop="@dimen/all_apps_divider_margin_vertical"
     android:paddingBottom="@dimen/all_apps_divider_margin_vertical"
-    android:paddingLeft="@dimen/container_fastscroll_thumb_max_width"
-    android:paddingRight="@dimen/container_fastscroll_thumb_max_width"
+    android:paddingLeft="@dimen/dynamic_grid_edge_margin"
+    android:paddingRight="@dimen/dynamic_grid_edge_margin"
     android:src="@drawable/all_apps_divider"
     android:scaleType="fitXY"
     android:focusable="false" />
\ No newline at end of file
diff --git a/res/layout/all_apps_search_divider.xml b/res/layout/all_apps_search_divider.xml
index d2ef691ead..c052c6635e 100644
--- a/res/layout/all_apps_search_divider.xml
+++ b/res/layout/all_apps_search_divider.xml
@@ -18,8 +18,8 @@
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:paddingBottom="@dimen/all_apps_divider_margin_vertical"
-    android:paddingLeft="@dimen/container_fastscroll_thumb_max_width"
-    android:paddingRight="@dimen/container_fastscroll_thumb_max_width"
+    android:paddingLeft="@dimen/dynamic_grid_edge_margin"
+    android:paddingRight="@dimen/dynamic_grid_edge_margin"
     android:src="@drawable/all_apps_search_divider"
     android:scaleType="fitXY"
     android:focusable="false" />
\ No newline at end of file
diff --git a/res/layout/all_apps_search_market.xml b/res/layout/all_apps_search_market.xml
index 3f19b2515f..6f2dd3d21e 100644
--- a/res/layout/all_apps_search_market.xml
+++ b/res/layout/all_apps_search_market.xml
@@ -19,8 +19,8 @@
     android:layout_width="match_parent"
     android:layout_height="48dp"
     android:gravity="center"
-    android:paddingLeft="@dimen/container_fastscroll_thumb_max_width"
-    android:paddingRight="@dimen/container_fastscroll_thumb_max_width"
+    android:paddingLeft="@dimen/dynamic_grid_edge_margin"
+    android:paddingRight="@dimen/dynamic_grid_edge_margin"
     android:fontFamily="sans-serif-medium"
     android:textSize="14sp"
     android:textColor="?android:attr/colorAccent"
diff --git a/res/layout/widgets_view.xml b/res/layout/widgets_view.xml
index 476901d1e6..47b068385d 100644
--- a/res/layout/widgets_view.xml
+++ b/res/layout/widgets_view.xml
@@ -53,7 +53,7 @@
             style="@style/FastScrollerPopup"
             android:id="@+id/fast_scroller_popup"
             android:layout_gravity="top|end"
-            android:layout_marginEnd="@dimen/container_fastscroll_popup_margin" />
+            android:layout_marginEnd="@dimen/fastscroll_popup_margin" />
 
         <ProgressBar
             android:layout_width="wrap_content"
diff --git a/res/values-land/dimens.xml b/res/values-land/dimens.xml
index 3915759952..b40aa14ac8 100644
--- a/res/values-land/dimens.xml
+++ b/res/values-land/dimens.xml
@@ -4,9 +4,9 @@
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
      You may obtain a copy of the License at
-  
+
           http://www.apache.org/licenses/LICENSE-2.0
-  
+
      Unless required by applicable law or agreed to in writing, software
      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -15,6 +15,13 @@
 -->
 
 <resources>
-<!-- Container -->
-     <item name="container_margin" format="fraction" type="fraction">12%</item>
+    <!-- Container -->
+    <item name="container_margin" format="fraction" type="fraction">12%</item>
+
+    <!-- Fast scroll -->
+    <dimen name="fastscroll_popup_width">58dp</dimen>
+    <dimen name="fastscroll_popup_height">48dp</dimen>
+    <dimen name="fastscroll_popup_padding">10dp</dimen>
+    <dimen name="fastscroll_popup_text_size">24dp</dimen>
+
 </resources>
diff --git a/res/values-sw720dp/dimens.xml b/res/values-sw720dp/dimens.xml
index 358d9b6a0c..e836d7d783 100644
--- a/res/values-sw720dp/dimens.xml
+++ b/res/values-sw720dp/dimens.xml
@@ -15,10 +15,16 @@
 -->
 
 <resources>
-<!-- All Apps -->
+    <!-- All Apps -->
     <dimen name="all_apps_button_scale_down">8dp</dimen>
     <dimen name="all_apps_search_bar_height">54dp</dimen>
     <dimen name="all_apps_empty_search_message_top_offset">64dp</dimen>
     <dimen name="all_apps_empty_search_bg_top_offset">180dp</dimen>
 
+    <!-- Fast scroll -->
+    <dimen name="fastscroll_popup_width">75dp</dimen>
+    <dimen name="fastscroll_popup_height">62dp</dimen>
+    <dimen name="fastscroll_popup_padding">13dp</dimen>
+    <dimen name="fastscroll_popup_text_size">32dp</dimen>
+
 </resources>
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 3a531b08db..57b4be4e2c 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -47,14 +47,18 @@
     <dimen name="widget_handle_margin">13dp</dimen>
     <dimen name="resize_frame_background_padding">24dp</dimen>
 
-<!-- Container -->
-    <dimen name="container_fastscroll_thumb_min_width">5dp</dimen>
-    <dimen name="container_fastscroll_thumb_max_width">9dp</dimen>
-    <dimen name="container_fastscroll_popup_margin">18dp</dimen>
-    <dimen name="container_fastscroll_thumb_height">72dp</dimen>
-    <dimen name="container_fastscroll_thumb_touch_inset">-24dp</dimen>
-    <dimen name="container_fastscroll_popup_size">72dp</dimen>
-    <dimen name="container_fastscroll_popup_text_size">48dp</dimen>
+<!-- Fast scroll -->
+    <dimen name="fastscroll_track_min_width">6dp</dimen>
+    <dimen name="fastscroll_track_max_width">8dp</dimen>
+    <dimen name="fastscroll_thumb_padding">1dp</dimen>
+    <dimen name="fastscroll_thumb_height">52dp</dimen>
+    <dimen name="fastscroll_thumb_touch_inset">-24dp</dimen>
+
+    <dimen name="fastscroll_popup_width">75dp</dimen>
+    <dimen name="fastscroll_popup_height">62dp</dimen>
+    <dimen name="fastscroll_popup_padding">13dp</dimen>
+    <dimen name="fastscroll_popup_text_size">32dp</dimen>
+    <dimen name="fastscroll_popup_margin">19dp</dimen>
 
 <!-- All Apps -->
     <dimen name="all_apps_button_scale_down">0dp</dimen>
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 8af6968a61..594c7dbdea 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -86,11 +86,11 @@
     </style>
 
     <style name="FastScrollerPopup" >
-        <item name="android:background">@drawable/container_fastscroll_popup_bg</item>
         <item name="android:layout_width">wrap_content</item>
-        <item name="android:minWidth">@dimen/container_fastscroll_popup_size</item>
-        <item name="android:layout_height">@dimen/container_fastscroll_popup_size</item>
-        <item name="android:textSize">@dimen/container_fastscroll_popup_text_size</item>
+        <item name="android:minWidth">@dimen/fastscroll_popup_width</item>
+        <item name="android:layout_height">@dimen/fastscroll_popup_height</item>
+        <item name="android:textSize">@dimen/fastscroll_popup_text_size</item>
+        <item name="android:paddingEnd">@dimen/fastscroll_popup_padding</item>
         <item name="android:gravity">center</item>
         <item name="android:alpha">0</item>
         <item name="android:elevation">3dp</item>
diff --git a/src/com/android/launcher3/BaseRecyclerView.java b/src/com/android/launcher3/BaseRecyclerView.java
index 514cc07511..84358ea37b 100644
--- a/src/com/android/launcher3/BaseRecyclerView.java
+++ b/src/com/android/launcher3/BaseRecyclerView.java
@@ -184,13 +184,6 @@ public abstract class BaseRecyclerView extends RecyclerView
         return availableScrollBarHeight;
     }
 
-    /**
-     * Returns the track color (ignoring alpha), can be overridden by each subclass.
-     */
-    public int getFastScrollerTrackColor(int defaultTrackColor) {
-        return defaultTrackColor;
-    }
-
     /**
      * Returns the scrollbar for this recycler view.
      */
diff --git a/src/com/android/launcher3/BaseRecyclerViewFastScrollBar.java b/src/com/android/launcher3/BaseRecyclerViewFastScrollBar.java
index 3039744648..9e8d300ae1 100644
--- a/src/com/android/launcher3/BaseRecyclerViewFastScrollBar.java
+++ b/src/com/android/launcher3/BaseRecyclerViewFastScrollBar.java
@@ -29,6 +29,7 @@ import android.view.ViewConfiguration;
 import android.widget.TextView;
 
 import com.android.launcher3.config.FeatureFlags;
+import com.android.launcher3.graphics.FastScrollThumbDrawable;
 import com.android.launcher3.util.Themes;
 
 /**
@@ -52,7 +53,7 @@ public class BaseRecyclerViewFastScrollBar {
 
     private final static int MAX_TRACK_ALPHA = 30;
     private final static int SCROLL_BAR_VIS_DURATION = 150;
-    private static final float FAST_SCROLL_OVERLAY_Y_OFFSET_FACTOR = 1.5f;
+    private static final float FAST_SCROLL_OVERLAY_Y_OFFSET_FACTOR = 0.75f;
 
     private final Rect mTmpRect = new Rect();
     private final BaseRecyclerView mRv;
@@ -64,12 +65,12 @@ public class BaseRecyclerViewFastScrollBar {
 
     private final int mMinWidth;
     private final int mMaxWidth;
+    private final int mThumbPadding;
 
     // Current width of the track
     private int mWidth;
     private ObjectAnimator mWidthAnimator;
 
-    private final Path mThumbPath = new Path();
     private final Paint mThumbPaint;
     private final int mThumbHeight;
 
@@ -94,7 +95,7 @@ public class BaseRecyclerViewFastScrollBar {
     public BaseRecyclerViewFastScrollBar(BaseRecyclerView rv, Resources res) {
         mRv = rv;
         mTrackPaint = new Paint();
-        mTrackPaint.setColor(rv.getFastScrollerTrackColor(Color.BLACK));
+        mTrackPaint.setColor(Themes.getAttrColor(rv.getContext(), android.R.attr.textColorPrimary));
         mTrackPaint.setAlpha(MAX_TRACK_ALPHA);
 
         mThumbPaint = new Paint();
@@ -102,16 +103,19 @@ public class BaseRecyclerViewFastScrollBar {
         mThumbPaint.setColor(Themes.getColorAccent(rv.getContext()));
         mThumbPaint.setStyle(Paint.Style.FILL);
 
-        mWidth = mMinWidth = res.getDimensionPixelSize(R.dimen.container_fastscroll_thumb_min_width);
-        mMaxWidth = res.getDimensionPixelSize(R.dimen.container_fastscroll_thumb_max_width);
-        mThumbHeight = res.getDimensionPixelSize(R.dimen.container_fastscroll_thumb_height);
-        mTouchInset = res.getDimensionPixelSize(R.dimen.container_fastscroll_thumb_touch_inset);
+        mWidth = mMinWidth = res.getDimensionPixelSize(R.dimen.fastscroll_track_min_width);
+        mMaxWidth = res.getDimensionPixelSize(R.dimen.fastscroll_track_max_width);
+
+        mThumbPadding = res.getDimensionPixelSize(R.dimen.fastscroll_thumb_padding);
+        mThumbHeight = res.getDimensionPixelSize(R.dimen.fastscroll_thumb_height);
+
+        mTouchInset = res.getDimensionPixelSize(R.dimen.fastscroll_thumb_touch_inset);
         mIsRtl = Utilities.isRtl(res);
-        updateThumbPath();
     }
 
     public void setPopupView(View popup) {
         mPopupView = (TextView) popup;
+        mPopupView.setBackground(new FastScrollThumbDrawable(mThumbPaint, mIsRtl));
     }
 
     public void setDetachThumbOnFastScroll() {
@@ -154,24 +158,6 @@ public class BaseRecyclerViewFastScrollBar {
         mRv.invalidate(left, top, left + mMaxWidth, top + mRv.getScrollbarTrackHeight());
 
         mWidth = width;
-        updateThumbPath();
-    }
-
-    /**
-     * Updates the path for the thumb drawable.
-     */
-    private void updateThumbPath() {
-        int smallWidth = mIsRtl ? mWidth : -mWidth;
-        int largeWidth = mIsRtl ? mMaxWidth : -mMaxWidth;
-
-        mThumbPath.reset();
-        mThumbPath.moveTo(0, 0);
-        mThumbPath.lineTo(0, mThumbHeight);             // Left edge
-        mThumbPath.lineTo(smallWidth, mThumbHeight);    // bottom edge
-        mThumbPath.cubicTo(smallWidth, mThumbHeight,    // right edge
-                largeWidth, mThumbHeight / 2,
-                smallWidth, 0);
-        mThumbPath.close();
     }
 
     public int getThumbHeight() {
@@ -265,15 +251,16 @@ public class BaseRecyclerViewFastScrollBar {
         }
         int saveCount = canvas.save(Canvas.MATRIX_SAVE_FLAG);
         if (!mIsRtl) {
-            canvas.translate(mRv.getWidth(), 0);
+            canvas.translate(mRv.getWidth() - mWidth, 0);
         }
         canvas.translate(0, mRv.getPaddingTop());
         // Draw the track
-        int thumbWidth = mIsRtl ? mWidth : -mWidth;
-        canvas.drawRect(0, 0, thumbWidth, mRv.getScrollbarTrackHeight(), mTrackPaint);
+        canvas.drawRoundRect(0, 0, mWidth, mRv.getScrollbarTrackHeight(),
+                mWidth, mWidth, mTrackPaint);
 
-        canvas.translate(0, mThumbOffsetY);
-        canvas.drawPath(mThumbPath, mThumbPaint);
+        canvas.translate(-mThumbPadding, mThumbOffsetY);
+        float r = mWidth + mThumbPadding + mThumbPadding;
+        canvas.drawRoundRect(0, 0, r, mThumbHeight, r, r, mThumbPaint);
         canvas.restoreToCount(saveCount);
     }
 
@@ -320,7 +307,8 @@ public class BaseRecyclerViewFastScrollBar {
     private void updatePopupY(int lastTouchY) {
         int height = mPopupView.getHeight();
         float top = lastTouchY - (FAST_SCROLL_OVERLAY_Y_OFFSET_FACTOR * height);
-        top = Math.max(mMaxWidth, Math.min(top, mRv.getScrollbarTrackHeight() - mMaxWidth - height));
+        top = Utilities.boundToRange(top,
+                mMaxWidth, mRv.getScrollbarTrackHeight() - mMaxWidth - height);
         mPopupView.setTranslationY(top);
     }
 }
diff --git a/src/com/android/launcher3/allapps/AllAppsRecyclerView.java b/src/com/android/launcher3/allapps/AllAppsRecyclerView.java
index b2a74ff157..0607a1e5da 100644
--- a/src/com/android/launcher3/allapps/AllAppsRecyclerView.java
+++ b/src/com/android/launcher3/allapps/AllAppsRecyclerView.java
@@ -376,7 +376,8 @@ public class AllAppsRecyclerView extends BaseRecyclerView {
         if (position == NO_POSITION) {
             return -1;
         }
-        return getCurrentScrollY(position, getLayoutManager().getDecoratedTop(child));
+        return getPaddingTop() +
+                getCurrentScrollY(position, getLayoutManager().getDecoratedTop(child));
     }
 
     public int getCurrentScrollY(int position, int offset) {
@@ -406,8 +407,7 @@ public class AllAppsRecyclerView extends BaseRecyclerView {
             }
             mCachedScrollPositions.put(position, y);
         }
-
-        return getPaddingTop() + y - offset;
+        return y - offset;
     }
 
     /**
@@ -416,7 +416,7 @@ public class AllAppsRecyclerView extends BaseRecyclerView {
      */
     @Override
     protected int getAvailableScrollHeight() {
-        return getCurrentScrollY(mApps.getAdapterItems().size(), 0)
+        return getPaddingTop() + getCurrentScrollY(mApps.getAdapterItems().size(), 0)
                 - getHeight() + getPaddingBottom();
     }
 
diff --git a/src/com/android/launcher3/graphics/FastScrollThumbDrawable.java b/src/com/android/launcher3/graphics/FastScrollThumbDrawable.java
new file mode 100644
index 0000000000..6ebc74eeb9
--- /dev/null
+++ b/src/com/android/launcher3/graphics/FastScrollThumbDrawable.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3.graphics;
+
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.Matrix;
+import android.graphics.Outline;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.PixelFormat;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+
+public class FastScrollThumbDrawable extends Drawable {
+
+    private static final Matrix sMatrix = new Matrix();
+
+    private final Path mPath = new Path();
+    private final Paint mPaint;
+    private final boolean mIsRtl;
+
+    public FastScrollThumbDrawable(Paint paint, boolean isRtl) {
+        mPaint = paint;
+        mIsRtl = isRtl;
+    }
+
+    @Override
+    public void getOutline(Outline outline) {
+        if (mPath.isConvex()) {
+            outline.setConvexPath(mPath);
+        }
+    }
+
+    @Override
+    protected void onBoundsChange(Rect bounds) {
+        mPath.reset();
+
+        float r = bounds.height()  * 0.5f;
+        // The path represents a rotate tear-drop shape, with radius of one corner is 1/5th of the
+        // other 3 corners.
+        float diameter = 2 * r;
+        float r2 = r / 5;
+        mPath.addRoundRect(bounds.left, bounds.top, bounds.left + diameter, bounds.top + diameter,
+                new float[] {r, r, r, r, r2, r2, r, r},
+                Path.Direction.CCW);
+
+        sMatrix.setRotate(-45, bounds.left + r, bounds.top + r);
+        if (mIsRtl) {
+            sMatrix.postTranslate(bounds.width(), 0);
+            sMatrix.postScale(-1, 1, bounds.width(), 0);
+        }
+        mPath.transform(sMatrix);
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        canvas.drawPath(mPath, mPaint);
+    }
+
+    @Override
+    public void setAlpha(int i) {
+        // Not supported
+    }
+
+    @Override
+    public void setColorFilter(ColorFilter colorFilter) {
+        // Not supported
+    }
+
+    @Override
+    public int getOpacity() {
+        return PixelFormat.TRANSLUCENT;
+    }
+}
diff --git a/src/com/android/launcher3/widget/WidgetsRecyclerView.java b/src/com/android/launcher3/widget/WidgetsRecyclerView.java
index f47ca3eebd..9730a82aad 100644
--- a/src/com/android/launcher3/widget/WidgetsRecyclerView.java
+++ b/src/com/android/launcher3/widget/WidgetsRecyclerView.java
@@ -59,10 +59,6 @@ public class WidgetsRecyclerView extends BaseRecyclerView {
         setLayoutManager(new LinearLayoutManager(getContext()));
     }
 
-    public int getFastScrollerTrackColor(int defaultTrackColor) {
-        return Color.WHITE;
-    }
-
     @Override
     public void setAdapter(Adapter adapter) {
         super.setAdapter(adapter);