diff --git a/src/com/android/launcher3/widget/picker/WidgetsListLayoutManager.java b/src/com/android/launcher3/widget/picker/WidgetsListLayoutManager.java
new file mode 100644
index 0000000..2b7f544
--- /dev/null
+++ b/src/com/android/launcher3/widget/picker/WidgetsListLayoutManager.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2021 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.widget.picker;
+
+import android.content.Context;
+
+import androidx.annotation.Nullable;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.android.launcher3.widget.picker.SearchAndRecommendationsScrollController.OnContentChangeListener;
+
+/**
+ * A layout manager for the {@link WidgetsRecyclerView}.
+ *
+ * {@link #setOnContentChangeListener(OnContentChangeListener)} can be used to register a callback
+ * for when the content of the layout manager has changed, following measurement and animation.
+ */
+public final class WidgetsListLayoutManager extends LinearLayoutManager {
+    @Nullable
+    private OnContentChangeListener mOnContentChangeListener;
+
+    public WidgetsListLayoutManager(Context context) {
+        super(context);
+    }
+
+    @Override
+    public void onLayoutCompleted(RecyclerView.State state) {
+        super.onLayoutCompleted(state);
+        if (mOnContentChangeListener != null) {
+            mOnContentChangeListener.onContentChanged();
+        }
+    }
+
+    public void setOnContentChangeListener(@Nullable OnContentChangeListener listener) {
+        mOnContentChangeListener = listener;
+    }
+}
diff --git a/src/com/android/launcher3/widget/picker/WidgetsRecyclerView.java b/src/com/android/launcher3/widget/picker/WidgetsRecyclerView.java
index 4f4f1a3..3ee8b33 100644
--- a/src/com/android/launcher3/widget/picker/WidgetsRecyclerView.java
+++ b/src/com/android/launcher3/widget/picker/WidgetsRecyclerView.java
@@ -23,7 +23,6 @@
 import android.view.View;
 import android.widget.TableLayout;
 
-import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
@@ -83,7 +82,9 @@
         super.onFinishInflate();
         // create a layout manager with Launcher's context so that scroll position
         // can be preserved during screen rotation.
-        setLayoutManager(new LinearLayoutManager(getContext()));
+        WidgetsListLayoutManager layoutManager = new WidgetsListLayoutManager(getContext());
+        layoutManager.setOnContentChangeListener(mOnContentChangeListener);
+        setLayoutManager(layoutManager);
     }
 
     @Override
@@ -92,22 +93,6 @@
         mAdapter = (WidgetsListAdapter) adapter;
     }
 
-    @Override
-    public void onChildAttachedToWindow(@NonNull View child) {
-        super.onChildAttachedToWindow(child);
-        if (mOnContentChangeListener != null) {
-            mOnContentChangeListener.onContentChanged();
-        }
-    }
-
-    @Override
-    public void onChildDetachedFromWindow(@NonNull View child) {
-        super.onChildDetachedFromWindow(child);
-        if (mOnContentChangeListener != null) {
-            mOnContentChangeListener.onContentChanged();
-        }
-    }
-
     /**
      * Maps the touch (from 0..1) to the adapter position that should be visible.
      */
@@ -268,6 +253,10 @@
 
     public void setOnContentChangeListener(@Nullable OnContentChangeListener listener) {
         mOnContentChangeListener = listener;
+        WidgetsListLayoutManager layoutManager = (WidgetsListLayoutManager) getLayoutManager();
+        if (layoutManager != null) {
+            layoutManager.setOnContentChangeListener(listener);
+        }
     }
 
     /**