更新动态加载逻辑

app/src/main/java/com/aiosman/ravenow/entity/Loader.kt

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