package cn.flightfeather.thirdapp.view.recyclerview
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import android.content.Context
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import cn.flightfeather.thirdapp.common.net.ResultCallBack
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import org.jetbrains.anko.runOnUiThread
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/**
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* @author riku
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* Date: 2020/12/24
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* 列表数据加载逻辑
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*/
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abstract class DataLoadModel<T>(private val application: Context) : ResultCallBack<List<T>> {
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var dataList = listOf<T>()
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private var loadState = LoadState.NONE
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private var needMore = true
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private var totalPage: Int = -1
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private var currentPage = 1
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var loadStateListener: (loadState: LoadState) -> Unit = {}
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var dataLoadListener: (dataList: List<T>) -> Unit = {}
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/**
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* 数据重载
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*/
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open fun refresh() {
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if (isLoading()) {
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return
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}
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currentPage = 1
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loadState = LoadState.Refresh
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onLoadState(loadState)
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loadDataByRefresh()
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}
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/**
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* 加载更多
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*/
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open fun loadMore() {
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if (isLoading()) {
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return
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}
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currentPage++
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loadState = LoadState.LoadMore
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onLoadState(loadState)
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loadDataByLoadMore(currentPage)
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}
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/**
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* 加载完成，刷新加载状态
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*/
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private fun completeLoadData(isFail: Boolean = false) {
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loadState = when (loadState) {
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LoadState.Refresh -> if (!isFail) LoadState.RefreshDone else LoadState.RefreshFail
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LoadState.LoadMore -> if (!isFail) {
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if (needMore) {
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LoadState.LoadMoreComplete
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} else {
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LoadState.LoadMoreEnd
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}
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} else LoadState.LoadMoreFail
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LoadState.NONE -> LoadState.RefreshDone
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else -> LoadState.RefreshDone
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}
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onLoadState(loadState)
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}
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/**
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* 刷新状态判断
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*/
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private fun isLoading(): Boolean =
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loadState == LoadState.Refresh || loadState == LoadState.LoadMore
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/**
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* 数据更新
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*/
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private fun commitResult(result: List<T>?) {
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result?.let {
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dataList = it
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onDataLoad(dataList)
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}
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}
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//根据分页判断当前执行的是刷新还是加载更多
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fun isFirstData(): Boolean = currentPage == 1
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override fun onPage(current: Int, total: Int) {
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if (total > 0) {
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totalPage = total
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}
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if (current > 0) {
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currentPage = current
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}
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application.runOnUiThread {
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needMore = (currentPage < totalPage)
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}
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}
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override fun onSuccess(result: List<T>?) {
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commitResult(result)
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completeLoadData()
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}
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override fun onCacheSuccess(result: List<T>?) {
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if (isFirstData()) {
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application.runOnUiThread {
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result?.let {
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commitResult(it)
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}
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}
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}
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}
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override fun onFailure() {
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completeLoadData(true)
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//获取新的下页信息失败时，分页数还原
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if (currentPage > 2) {
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currentPage--
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}
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}
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private fun onLoadState(loadState: LoadState) = loadStateListener(loadState)
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private fun onDataLoad(dataList: List<T>) = dataLoadListener(dataList)
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abstract fun loadDataByRefresh()
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abstract fun loadDataByLoadMore(page: Int)
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}
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