From 40e7cea2384383bebcdc07a8494ae6637d996419 Mon Sep 17 00:00:00 2001
From: wahyudotdev <wahyu.smallker@gmail.com>
Date: Tue, 17 May 2022 11:18:31 +0700
Subject: [PATCH] feat: add ReactiveListAdapter that using DiffUtilCallback
 with ability of tracking item changes and simplify update list proccess

---
 .../core/base/adapter/ReactiveListAdapter.kt  | 100 ++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 core/src/main/java/com/crocodic/core/base/adapter/ReactiveListAdapter.kt

diff --git a/core/src/main/java/com/crocodic/core/base/adapter/ReactiveListAdapter.kt b/core/src/main/java/com/crocodic/core/base/adapter/ReactiveListAdapter.kt
new file mode 100644
index 0000000..e50d3d2
--- /dev/null
+++ b/core/src/main/java/com/crocodic/core/base/adapter/ReactiveListAdapter.kt
@@ -0,0 +1,100 @@
+package com.crocodic.core.base.adapter
+
+import android.annotation.SuppressLint
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.databinding.DataBindingUtil
+import androidx.databinding.ViewDataBinding
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import com.crocodic.core.BR
+
+/**
+ * ### Ini makanan apa ?
+ *
+ * Sebagai pengganti CoreListAdapter
+ *
+ * Adapter ini cocok digunakan untuk membuat list yang posisi atau jumlah itemnya berubah-ubah,
+ *
+ * contoh ketika membuat list yang memerlukan aksi hapus item sehingga tidak perlu
+ *
+ * mengecek secara manual item yang hilang dari list dan tidak perlu memanggil method
+ *
+ * notifyItemChanged (thaks to DiffUtilCallback). Efek animasi perubahan item juga
+ *
+ * sudah dihandle secara otomatis
+ *
+ *```
+ * ```
+ * ### Fitur
+ *
+ * - Cukup dengan memanggil satu method submitList untuk memperbarui list item
+ *
+ * (tidak perlu lagi : clear list -> notifyDataSetChanged -> addAll -> notifyItemRangeChanged)
+ * - Reactive terhadap perubahan list
+ *
+ * - Animasi perubahan list
+ *
+ *
+ * ### Cara penggunaan adapter :
+ * ```
+ * // step 1 : inisialisasi adapter
+ * val adapter = ReactiveListAdapter<ItemOrderBinding, Order>(R.layout.item_order)
+ *
+ * adapter.initItem { pos, data ->
+ *   // handle onclick disini
+ * }
+ *
+ * binding.rvOrder.adapter = adapter
+ *
+ *
+ * // step 2 : perbarui list item
+ * viewModel.orderList.observe(viewLifecycleowner) { list: List<Order> ->
+ *      adapter.submitList(list)
+ * }
+ *
+ * ```
+ */
+open class ReactiveListAdapter<VB: ViewDataBinding, T: Any>(private val layoutRes: Int) : ListAdapter<T, ReactiveListAdapter<VB, T>.ItemViewHolder<VB, T>>(DiffUtilCallback()){
+
+    var onItemClick: ((position: Int, data: T) -> Unit)? = null
+
+    open fun initItem(onItemClick: ((position: Int, data: T) -> Unit)? = null): ReactiveListAdapter<VB, T> {
+        this.onItemClick = onItemClick
+        return this
+    }
+
+    inner class ItemViewHolder<VB : ViewDataBinding, T: Any?>(val binding: VB) : RecyclerView.ViewHolder(binding.root) {
+        fun bind(data: T?) {
+            binding.setVariable(BR.data, data)
+            binding.executePendingBindings()
+        }
+    }
+
+    override fun onBindViewHolder(holder: ItemViewHolder<VB, T>, position: Int) {
+        val item = getItem(position)
+        item?.let { itm ->
+            holder.bind(itm)
+            onItemClick?.let {
+                holder.itemView.setOnClickListener { it(position, itm) }
+            }
+        }
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ItemViewHolder<VB, T> {
+        val binding = DataBindingUtil.inflate<VB>(LayoutInflater.from(parent.context), layoutRes, parent, false)
+        return ItemViewHolder(binding)
+    }
+
+    class DiffUtilCallback<T: Any> : DiffUtil.ItemCallback<T>() {
+        override fun areItemsTheSame(oldItem: T, newItem: T): Boolean {
+            return oldItem == newItem
+        }
+
+        @SuppressLint("DiffUtilEquals")
+        override fun areContentsTheSame(oldItem: T, newItem: T): Boolean {
+            return newItem === oldItem
+        }
+    }
+}
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