/
AssemblySingleDataRecyclerAdapter.kt
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/
AssemblySingleDataRecyclerAdapter.kt
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/*
* Copyright (C) 2021 panpf <panpfpanpf@outlook.com>
*
* 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 com.github.panpf.assemblyadapter.recycler
import com.github.panpf.assemblyadapter.ItemFactory
/**
* Single data version of [AssemblyRecyclerAdapter]
*
* @param itemFactory Can match [data]'s [ItemFactory]
* @param initData Initial data
* @see ItemFactory
*/
open class AssemblySingleDataRecyclerAdapter<DATA : Any>(
val itemFactory: ItemFactory<DATA>,
initData: DATA? = null
) : AssemblyRecyclerAdapter<DATA>(listOf(itemFactory)) {
/**
* The only data of the current adapter, notifyItem\* will be triggered when the data changes
*/
var data: DATA?
set(value) {
if (value != null) {
super.submitList(listOf(value))
} else {
super.submitList(null)
}
}
get() = if (itemCount > 0) getItemData(0) else null
init {
if (initData != null) {
this.data = initData
}
}
override fun submitList(list: List<DATA>?) {
require(list?.size ?: 0 <= 1) {
"Cannot submit a list with size greater than 1"
}
super.submitList(list)
}
override fun onDataListChanged(oldList: List<DATA>, newList: List<DATA>) {
val oldItem = oldList.firstOrNull() != null
val newItem = newList.firstOrNull() != null
if (oldItem && !newItem) {
notifyItemRemoved(0)
} else if (newItem && !oldItem) {
notifyItemInserted(0)
} else if (oldItem && newItem) {
notifyItemChanged(0)
}
}
}