From 51ad2d10de80393371a0e1b92e107c90231d0f72 Mon Sep 17 00:00:00 2001
From: t895 <clombardo169@gmail.com>
Date: Mon, 8 Jan 2024 00:16:28 -0500
Subject: android: Create generic adapter and viewholder

Eliminates repeated code associated with every async differ list
---
 .../yuzu/yuzu_emu/adapters/AbstractDiffAdapter.kt  | 33 ++++++++++++++++++++++
 .../yuzu/yuzu_emu/viewholder/AbstractViewHolder.kt | 18 ++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 src/android/app/src/main/java/org/yuzu/yuzu_emu/adapters/AbstractDiffAdapter.kt
 create mode 100644 src/android/app/src/main/java/org/yuzu/yuzu_emu/viewholder/AbstractViewHolder.kt

diff --git a/src/android/app/src/main/java/org/yuzu/yuzu_emu/adapters/AbstractDiffAdapter.kt b/src/android/app/src/main/java/org/yuzu/yuzu_emu/adapters/AbstractDiffAdapter.kt
new file mode 100644
index 000000000..f006f9e3d
--- /dev/null
+++ b/src/android/app/src/main/java/org/yuzu/yuzu_emu/adapters/AbstractDiffAdapter.kt
@@ -0,0 +1,33 @@
+// SPDX-FileCopyrightText: 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package org.yuzu.yuzu_emu.adapters
+
+import android.annotation.SuppressLint
+import androidx.recyclerview.widget.AsyncDifferConfig
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import org.yuzu.yuzu_emu.viewholder.AbstractViewHolder
+import androidx.recyclerview.widget.RecyclerView
+
+/**
+ * Generic adapter that implements an [AsyncDifferConfig] and covers some of the basic boilerplate
+ * code used in every [RecyclerView].
+ * Type assigned to [Model] must inherit from [Object] in order to be compared properly.
+ */
+abstract class AbstractDiffAdapter<Model : Any, Holder : AbstractViewHolder<Model>> :
+    ListAdapter<Model, Holder>(AsyncDifferConfig.Builder(DiffCallback<Model>()).build()) {
+    override fun onBindViewHolder(holder: Holder, position: Int) =
+        holder.bind(currentList[position])
+
+    private class DiffCallback<Model> : DiffUtil.ItemCallback<Model>() {
+        override fun areItemsTheSame(oldItem: Model & Any, newItem: Model & Any): Boolean {
+            return oldItem === newItem
+        }
+
+        @SuppressLint("DiffUtilEquals")
+        override fun areContentsTheSame(oldItem: Model & Any, newItem: Model & Any): Boolean {
+            return oldItem == newItem
+        }
+    }
+}
diff --git a/src/android/app/src/main/java/org/yuzu/yuzu_emu/viewholder/AbstractViewHolder.kt b/src/android/app/src/main/java/org/yuzu/yuzu_emu/viewholder/AbstractViewHolder.kt
new file mode 100644
index 000000000..7101ad434
--- /dev/null
+++ b/src/android/app/src/main/java/org/yuzu/yuzu_emu/viewholder/AbstractViewHolder.kt
@@ -0,0 +1,18 @@
+// SPDX-FileCopyrightText: 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package org.yuzu.yuzu_emu.viewholder
+
+import androidx.recyclerview.widget.RecyclerView
+import androidx.viewbinding.ViewBinding
+import org.yuzu.yuzu_emu.adapters.AbstractDiffAdapter
+import org.yuzu.yuzu_emu.adapters.AbstractListAdapter
+
+/**
+ * [RecyclerView.ViewHolder] meant to work together with a [AbstractDiffAdapter] or a
+ * [AbstractListAdapter] so we can run [bind] on each list item without needing a manual hookup.
+ */
+abstract class AbstractViewHolder<Model>(binding: ViewBinding) :
+    RecyclerView.ViewHolder(binding.root) {
+    abstract fun bind(model: Model)
+}
-- 
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