RecyclerView Adapter Template (Kotlin)

recyclerview_adapter.kt

#if (${PACKAGE_NAME} && ${PACKAGE_NAME} != "")package ${PACKAGE_NAME}#end

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.DiffUtil
import androidx.recyclerview.widget.RecyclerView

#parse("File Header.java")
class ${Adapter_Name} : RecyclerView.Adapter<${Adapter_Name}.ViewHolder>() {

    private var list: MutableList<${Model_Class}> = mutableListOf()
     lateinit var onClickListener: OnClickListener

    interface OnClickListener {
        fun onClick(item: ${Model_Class})
    }

    fun setOnClickListener(listener: (${Model_Class}) -> Unit) {}

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        return ViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.${Item_Layout_ID}, parent, false))
    }

    override fun getItemCount() = list.size

    override fun onBindViewHolder(holder: ViewHolder, position: Int) = holder.bind(list[position],this.onClickListener)

    fun updateList(newList: List<${Model_Class}>) {
         val diffResult: DiffUtil.DiffResult = DiffUtil.calculateDiff(DiffUtilCallback(newList.toMutableList(), this.list))
        list.clear()
        list.addAll(newList)
        diffResult.dispatchUpdatesTo(this)
    }

    class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        fun bind(item: ${Model_Class}, onClickListener: OnClickListener) = with(itemView) {
            
           setOnClickListener {
                onClickListener.onClick(item)
            }
        }
    }

    class DiffUtilCallback(private var newList: MutableList<${Model_Class}>, private var oldList: MutableList<${Model_Class}>) : DiffUtil.Callback() {

        override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
            return newList[newItemPosition].name == oldList[oldItemPosition].name
        }

        override fun getOldListSize(): Int {
            return oldList.size
        }

        override fun getNewListSize(): Int {
            return newList.size
        }

        override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
            return newList[newItemPosition].image == oldList[oldItemPosition].image
        }
    }
}