Change separator to use its own view holder

app/src/main/java/org/mozilla/fenix/library/LibrarySiteItemView.kt

@@ -75,13 +75,7 @@ class LibrarySiteItemView @JvmOverloads constructor(
      * Change visibility of parts of this view based on what type of item is being represented.
      */
     fun displayAs(mode: ItemType) {
-        favicon.isVisible = mode != ItemType.SEPARATOR
-        title.isVisible = mode != ItemType.SEPARATOR
         url.isVisible = mode == ItemType.SITE
-        overflow_menu.isVisible = mode != ItemType.SEPARATOR
-        separator.isVisible = mode == ItemType.SEPARATOR
-        isClickable = mode != ItemType.SEPARATOR
-        isFocusable = mode != ItemType.SEPARATOR
     }
 
     /**
@@ -136,7 +130,7 @@ class LibrarySiteItemView @JvmOverloads constructor(
     }
 
     enum class ItemType {
-        SITE, FOLDER, SEPARATOR;
+        SITE, FOLDER;
     }
 
     companion object {

app/src/main/java/org/mozilla/fenix/library/bookmarks/BookmarkAdapter.kt

@@ -22,7 +22,7 @@ import org.mozilla.fenix.library.bookmarks.viewholders.BookmarkNodeViewHolder
 import org.mozilla.fenix.library.bookmarks.viewholders.BookmarkSeparatorViewHolder
 
 class BookmarkAdapter(private val emptyView: View, private val interactor: BookmarkViewInteractor) :
-    RecyclerView.Adapter<BookmarkNodeViewHolder>() {
+    RecyclerView.Adapter<RecyclerView.ViewHolder>() {
 
     private var tree: List<BookmarkNode> = listOf()
     private var mode: BookmarkFragmentState.Mode = BookmarkFragmentState.Mode.Normal()
@@ -78,43 +78,44 @@ class BookmarkAdapter(private val emptyView: View, private val interactor: Bookm
         override fun getNewListSize(): Int = new.size
     }
 
-    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BookmarkNodeViewHolder {
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
         val view = LayoutInflater.from(parent.context)
             .inflate(R.layout.bookmark_list_item, parent, false) as LibrarySiteItemView
 
         return when (viewType) {
             LibrarySiteItemView.ItemType.SITE.ordinal -> BookmarkItemViewHolder(view, interactor)
             LibrarySiteItemView.ItemType.FOLDER.ordinal -> BookmarkFolderViewHolder(view, interactor)
-            LibrarySiteItemView.ItemType.SEPARATOR.ordinal -> BookmarkSeparatorViewHolder(view, interactor)
+            BookmarkSeparatorViewHolder.LAYOUT_ID -> BookmarkSeparatorViewHolder(view)
             else -> throw IllegalStateException("ViewType $viewType does not match to a ViewHolder")
         }
     }
 
     override fun getItemViewType(position: Int): Int {
         return when (tree[position].type) {
-            BookmarkNodeType.ITEM -> LibrarySiteItemView.ItemType.SITE
-            BookmarkNodeType.FOLDER -> LibrarySiteItemView.ItemType.FOLDER
-            BookmarkNodeType.SEPARATOR -> LibrarySiteItemView.ItemType.SEPARATOR
+            BookmarkNodeType.ITEM -> LibrarySiteItemView.ItemType.SITE.ordinal
+            BookmarkNodeType.FOLDER -> LibrarySiteItemView.ItemType.FOLDER.ordinal
+            BookmarkNodeType.SEPARATOR -> BookmarkSeparatorViewHolder.LAYOUT_ID
             else -> throw IllegalStateException("Item $tree[position] does not match to a ViewType")
-        }.ordinal
+        }
     }
 
     override fun getItemCount(): Int = tree.size
 
     override fun onBindViewHolder(
-        holder: BookmarkNodeViewHolder,
+        holder: RecyclerView.ViewHolder,
         position: Int,
         payloads: MutableList<Any>
     ) {
         if (payloads.isNotEmpty() && payloads[0] is BookmarkPayload) {
-            holder.bind(tree[position], mode, payloads[0] as BookmarkPayload)
+            (holder as? BookmarkNodeViewHolder)
+                ?.bind(tree[position], mode, payloads[0] as BookmarkPayload)
         } else {
             super.onBindViewHolder(holder, position, payloads)
         }
     }
 
-    override fun onBindViewHolder(holder: BookmarkNodeViewHolder, position: Int) {
-        holder.bind(tree[position], mode)
+    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
+        (holder as? BookmarkNodeViewHolder)?.bind(tree[position], mode)
     }
 }
 

app/src/main/java/org/mozilla/fenix/library/bookmarks/viewholders/BookmarkSeparatorViewHolder.kt

@@ -4,36 +4,15 @@
 
 package org.mozilla.fenix.library.bookmarks.viewholders
 
-import mozilla.components.concept.storage.BookmarkNode
-import org.mozilla.fenix.library.LibrarySiteItemView
-import org.mozilla.fenix.library.bookmarks.BookmarkFragmentState
-import org.mozilla.fenix.library.bookmarks.BookmarkPayload
-import org.mozilla.fenix.library.bookmarks.BookmarkViewInteractor
+import android.view.View
+import androidx.recyclerview.widget.RecyclerView
+import org.mozilla.fenix.R
 
 /**
  * Simple view holder for dividers in the bookmarks list.
  */
-class BookmarkSeparatorViewHolder(
-    view: LibrarySiteItemView,
-    interactor: BookmarkViewInteractor
-) : BookmarkNodeViewHolder(view, interactor) {
-
-    override var item: BookmarkNode? = null
-
-    override fun bind(
-        item: BookmarkNode,
-        mode: BookmarkFragmentState.Mode
-    ) {
-        this.item = item
-        containerView.displayAs(LibrarySiteItemView.ItemType.SEPARATOR)
-        updateMenu(item.type)
-    }
-
-    override fun bind(
-        item: BookmarkNode,
-        mode: BookmarkFragmentState.Mode,
-        payload: BookmarkPayload
-    ) {
-        bind(item, mode)
+class BookmarkSeparatorViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+    companion object {
+        const val LAYOUT_ID = R.layout.library_separator
     }
 }

app/src/main/res/layout/library_separator.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="@dimen/library_item_height"
+    android:importantForAccessibility="no">
+    <View
+        android:id="@+id/separator"
+        android:layout_width="match_parent"
+        android:layout_height="2dp"
+        android:layout_marginStart="16dp"
+        android:layout_marginEnd="16dp"
+        android:layout_gravity="center"
+        android:background="?neutralFaded"/>
+</FrameLayout>

app/src/main/res/layout/library_site_item.xml

@@ -84,18 +84,4 @@
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toTopOf="parent"/>
 
-    <View
-            android:id="@+id/separator"
-            android:layout_width="0dp"
-            android:layout_height="2dp"
-            android:layout_marginStart="16dp"
-            android:layout_marginEnd="16dp"
-            android:importantForAccessibility="no"
-            app:layout_constraintTop_toTopOf="parent"
-            app:layout_constraintBottom_toBottomOf="parent"
-            app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintEnd_toEndOf="parent"
-            android:background="?neutralFaded"
-            android:visibility="gone"/>
-
 </androidx.constraintlayout.widget.ConstraintLayout>