60 lines
1.5 KiB
Kotlin
60 lines
1.5 KiB
Kotlin
package com.aiosman.ravenow.entity
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import androidx.compose.runtime.getValue
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import androidx.compose.runtime.mutableStateOf
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import androidx.compose.runtime.setValue
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import com.aiosman.ravenow.data.ListContainer
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abstract class DataLoader<T,ET> {
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var list: MutableList<T> = mutableListOf()
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var page by mutableStateOf(1)
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var total by mutableStateOf(0)
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var pageSize by mutableStateOf(10)
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var hasNext by mutableStateOf(true)
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var onListChanged: ((List<T>) -> Unit)? = null
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private var firstLoad = true
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abstract suspend fun fetchData(
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page: Int, pageSize: Int, extra: ET
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): ListContainer<T>
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suspend fun loadData(
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extra: ET
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) {
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if (!firstLoad) {
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return
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}
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firstLoad = false
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val result = fetchData(page, pageSize, extra)
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list = result.list.toMutableList()
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this.page = page
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this.total = result.total
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this.pageSize = pageSize
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this.hasNext = result.list.size == pageSize
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onListChanged?.invoke(list)
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}
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suspend fun loadMore(extra: ET) {
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if (firstLoad) {
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return
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}
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if (!hasNext) {
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return
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}
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val result = fetchData(page + 1, pageSize, extra)
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list.addAll(result.list)
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page += 1
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hasNext = result.list.size == pageSize
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onListChanged?.invoke(list)
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}
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fun clear() {
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list.clear()
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page = 1
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total = 0
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pageSize = 10
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hasNext = true
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firstLoad = true
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}
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} |