DataBindingAdapter基类

DataBindingListAdapter.kt

/*
 * Copyright (C) 2017 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 cn.whdx.market.base

import android.view.ViewGroup
import androidx.databinding.ViewDataBinding
import androidx.recyclerview.widget.AsyncDifferConfig
import androidx.recyclerview.widget.DiffUtil
import androidx.recyclerview.widget.ListAdapter

/**
 * A generic RecyclerView adapter that uses Data Binding & DiffUtil.
 *
 * @param <T> Type of the items in the list
 * @param <V> The type of the ViewDataBinding
</V></T> */
abstract class DataBindingListAdapter<T, V : ViewDataBinding>(
        diffCallback: DiffUtil.ItemCallback<T>
) : ListAdapter<T, DataBindingViewHolder<V>>(
        AsyncDifferConfig.Builder<T>(diffCallback)
                .build()
) {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DataBindingViewHolder<V> {
        val binding = createBinding(parent)
        return DataBindingViewHolder(binding)
    }

    protected abstract fun createBinding(parent: ViewGroup): V

    override fun onBindViewHolder(holder: DataBindingViewHolder<V>, position: Int) {
        bind(holder.binding, getItem(position))
        holder.binding.executePendingBindings()
    }

    protected abstract fun bind(binding: V, item: T)
}