From 9e4c359054dbc774e38179887519079bc4c4b25b Mon Sep 17 00:00:00 2001
From: Sunny Goyal <sunnygoyal@google.com>
Date: Wed, 7 Jun 2017 14:05:08 -0700
Subject: [PATCH] Adding utility method to temporarily hide scrollbar

Bug: 37616877
Change-Id: I286493746c44ace8958ffd8df24317125b445cf7
---
 src/com/android/launcher3/BaseRecyclerView.java  | 16 ++++++++++++++--
 .../launcher3/allapps/AllAppsRecyclerView.java   |  4 ++++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/com/android/launcher3/BaseRecyclerView.java b/src/com/android/launcher3/BaseRecyclerView.java
index 1e6d894850..514cc07511 100644
--- a/src/com/android/launcher3/BaseRecyclerView.java
+++ b/src/com/android/launcher3/BaseRecyclerView.java
@@ -48,6 +48,8 @@ public abstract class BaseRecyclerView extends RecyclerView
     private int mDownY;
     private int mLastY;
 
+    private boolean mScrollBarVisible = true;
+
     public BaseRecyclerView(Context context) {
         this(context, null);
     }
@@ -199,8 +201,18 @@ public abstract class BaseRecyclerView extends RecyclerView
     @Override
     protected void dispatchDraw(Canvas canvas) {
         super.dispatchDraw(canvas);
-        onUpdateScrollbar(0);
-        mScrollbar.draw(canvas);
+        if (mScrollBarVisible) {
+            onUpdateScrollbar(0);
+            mScrollbar.draw(canvas);
+        }
+    }
+
+    /**
+     * Sets the scrollbar visibility. The call does not refresh the UI, its the responsibility
+     * of the caller to call {@link #invalidate()}.
+     */
+    public void setScrollBarVisible(boolean visible) {
+        mScrollBarVisible = visible;
     }
 
     /**
diff --git a/src/com/android/launcher3/allapps/AllAppsRecyclerView.java b/src/com/android/launcher3/allapps/AllAppsRecyclerView.java
index d76abccd3b..b2a74ff157 100644
--- a/src/com/android/launcher3/allapps/AllAppsRecyclerView.java
+++ b/src/com/android/launcher3/allapps/AllAppsRecyclerView.java
@@ -97,6 +97,10 @@ public class AllAppsRecyclerView extends BaseRecyclerView {
         mFastScrollHelper = new AllAppsFastScrollHelper(this, apps);
     }
 
+    public AlphabeticalAppsList getApps() {
+        return mApps;
+    }
+
     /**
      * Sets the number of apps per row in this recycler view.
      */