366 lines
11 KiB
JavaScript
366 lines
11 KiB
JavaScript
// src/views/Community/components/DynamicNewsCard/hooks/usePagination.js
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// 分页逻辑自定义 Hook
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import { useState, useMemo, useCallback } from 'react';
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import { fetchDynamicNews } from '../../../../../store/slices/communityDataSlice';
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import { logger } from '../../../../../utils/logger';
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import {
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PAGINATION_CONFIG,
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DISPLAY_MODES,
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DEFAULT_MODE,
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TOAST_CONFIG
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} from '../constants';
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/**
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* 分页逻辑自定义 Hook
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* @param {Object} options - Hook 配置选项
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* @param {Array} options.allCachedEvents - 完整缓存事件列表
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* @param {number} options.total - 服务端总数量
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* @param {number} options.cachedCount - 已缓存数量
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* @param {Function} options.dispatch - Redux dispatch 函数
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* @param {Function} options.toast - Toast 通知函数
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* @returns {Object} 分页状态和方法
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*/
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export const usePagination = ({ allCachedEvents, total, cachedCount, dispatch, toast }) => {
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// 本地状态
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const [currentPage, setCurrentPage] = useState(PAGINATION_CONFIG.INITIAL_PAGE);
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const [loadingPage, setLoadingPage] = useState(null);
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const [mode, setMode] = useState(DEFAULT_MODE);
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// 根据模式决定每页显示数量
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const pageSize = mode === DISPLAY_MODES.CAROUSEL
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? PAGINATION_CONFIG.CAROUSEL_PAGE_SIZE
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: PAGINATION_CONFIG.GRID_PAGE_SIZE;
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// 计算总页数（基于服务端总数据量）
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const totalPages = Math.ceil(total / pageSize) || 1;
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// 检查是否还有更多数据
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const hasMore = cachedCount < total;
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// 从缓存中切片获取当前页数据（过滤 null 占位符）
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const currentPageEvents = useMemo(() => {
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const startIndex = (currentPage - 1) * pageSize;
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const endIndex = startIndex + pageSize;
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return allCachedEvents.slice(startIndex, endIndex).filter(event => event !== null);
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}, [allCachedEvents, currentPage, pageSize]);
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/**
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* 子函数1: 检查目标页缓存状态
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* @param {number} targetPage - 目标页码
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* @returns {Object} { isTargetPageCached, targetPageInfo }
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*/
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const checkTargetPageCache = useCallback((targetPage) => {
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const targetPageStartIndex = (targetPage - 1) * pageSize;
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const targetPageEndIndex = targetPageStartIndex + pageSize;
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const targetPageData = allCachedEvents.slice(targetPageStartIndex, targetPageEndIndex);
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const validTargetData = targetPageData.filter(e => e !== null);
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const expectedCount = Math.min(pageSize, total - targetPageStartIndex);
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const isTargetPageCached = validTargetData.length >= expectedCount;
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logger.debug('DynamicNewsCard', '目标页缓存检查', {
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targetPage,
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targetPageStartIndex,
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targetPageEndIndex,
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targetPageDataLength: targetPageData.length,
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validTargetDataLength: validTargetData.length,
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expectedCount,
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isTargetPageCached
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});
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return {
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isTargetPageCached,
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targetPageInfo: {
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startIndex: targetPageStartIndex,
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endIndex: targetPageEndIndex,
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validCount: validTargetData.length,
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expectedCount
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}
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};
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}, [allCachedEvents, pageSize, total]);
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/**
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* 子函数2: 计算预加载范围
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* @param {number} targetPage - 目标页码
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* @param {number} fromPage - 来源页码
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* @returns {Array<number>} 预加载页码数组
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*/
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const calculatePreloadRange = useCallback((targetPage, fromPage) => {
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const isSequentialNavigation = Math.abs(targetPage - fromPage) === 1;
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let preloadRange;
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if (isSequentialNavigation) {
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// 连续翻页：前后各N页（N = PRELOAD_RANGE）
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const start = Math.max(1, targetPage - PAGINATION_CONFIG.PRELOAD_RANGE);
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const end = Math.min(totalPages, targetPage + PAGINATION_CONFIG.PRELOAD_RANGE);
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preloadRange = Array.from(
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{ length: end - start + 1 },
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(_, i) => start + i
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);
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} else {
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// 跳转翻页：只加载当前页
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preloadRange = [targetPage];
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}
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logger.debug('DynamicNewsCard', '计算预加载范围', {
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targetPage,
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fromPage,
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isSequentialNavigation,
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preloadRange
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});
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return preloadRange;
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}, [totalPages]);
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/**
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* 子函数3: 查找缺失页面
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* @param {Array<number>} preloadRange - 预加载范围
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* @returns {Array<number>} 缺失页码数组
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*/
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const findMissingPages = useCallback((preloadRange) => {
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const missingPages = preloadRange.filter(page => {
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const pageStartIndex = (page - 1) * pageSize;
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const pageEndIndex = pageStartIndex + pageSize;
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// 如果该页超出数组范围，说明未缓存
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if (pageEndIndex > allCachedEvents.length) {
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logger.debug('DynamicNewsCard', `页面${page}超出数组范围`, {
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pageStartIndex,
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pageEndIndex,
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allCachedEventsLength: allCachedEvents.length
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});
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return true;
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}
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// 检查该页的数据是否包含 null 占位符或数据不足
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const pageData = allCachedEvents.slice(pageStartIndex, pageEndIndex);
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const validData = pageData.filter(e => e !== null);
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const expectedCount = Math.min(pageSize, total - pageStartIndex);
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const hasNullOrIncomplete = validData.length < expectedCount;
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logger.debug('DynamicNewsCard', `页面${page}数据检查`, {
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pageStartIndex,
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pageEndIndex,
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pageDataLength: pageData.length,
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validDataLength: validData.length,
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expectedCount,
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hasNullOrIncomplete
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});
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return hasNullOrIncomplete;
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});
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logger.debug('DynamicNewsCard', '缺失页面检测完成', {
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preloadRange,
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missingPages,
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missingPagesCount: missingPages.length
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});
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return missingPages;
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}, [allCachedEvents, pageSize, total]);
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/**
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* 子函数4: 加载页面数据
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* @param {Array<number>} missingPages - 缺失页码数组
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* @param {number} targetPage - 目标页码
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* @param {boolean} silentMode - 静默模式（后台预加载）
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* @returns {Promise<boolean>} 是否加载成功
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*/
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const loadPages = useCallback(async (missingPages, targetPage, silentMode = false) => {
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if (!silentMode) {
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// 显示 loading 状态
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setLoadingPage(targetPage);
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}
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try {
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logger.debug('DynamicNewsCard', '开始加载页面数据', {
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missingPages,
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targetPage,
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silentMode,
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pageSize
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});
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// 拆分为单页请求，避免 per_page 动态值导致后端返回空数据
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for (const page of missingPages) {
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logger.debug('DynamicNewsCard', `开始加载第 ${page} 页`);
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await dispatch(fetchDynamicNews({
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page: page,
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per_page: pageSize, // 固定值（5或10），不使用动态计算
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pageSize: pageSize,
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clearCache: false
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})).unwrap();
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logger.debug('DynamicNewsCard', `第 ${page} 页加载完成`);
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}
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logger.debug('DynamicNewsCard', '所有页面加载完成', {
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missingPages,
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silentMode
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});
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return true;
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} catch (error) {
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logger.error('DynamicNewsCard', 'loadPages', error, {
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targetPage,
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silentMode,
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missingPages
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});
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if (!silentMode) {
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// 非静默模式下显示错误提示
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toast({
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title: '加载失败',
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description: `无法加载第 ${targetPage} 页数据，请稍后重试`,
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status: 'error',
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duration: TOAST_CONFIG.DURATION_ERROR,
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isClosable: true,
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position: 'top'
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});
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}
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return false;
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} finally {
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if (!silentMode) {
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// 清除加载状态
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setLoadingPage(null);
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}
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}
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}, [dispatch, pageSize, toast]);
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// 翻页处理（智能预加载）- 使用子函数重构
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const handlePageChange = useCallback(async (newPage) => {
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// 🔍 诊断日志 - 记录翻页开始状态
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logger.debug('DynamicNewsCard', '开始翻页', {
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currentPage,
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newPage,
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pageSize,
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totalPages,
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hasMore,
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total,
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allCachedEventsLength: allCachedEvents.length,
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cachedCount
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});
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// 步骤1: 检查目标页缓存状态
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const { isTargetPageCached } = checkTargetPageCache(newPage);
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// 步骤2: 计算预加载范围
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const preloadRange = calculatePreloadRange(newPage, currentPage);
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// 步骤3: 查找缺失页面
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const missingPages = findMissingPages(preloadRange);
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// 步骤4: 根据情况加载数据
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if (isTargetPageCached && missingPages.length > 0 && hasMore) {
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// 场景A: 目标页已缓存，立即切换，后台静默预加载其他页
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logger.debug('DynamicNewsCard', '目标页已缓存，立即切换 + 后台预加载', {
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currentPage,
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newPage,
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缺失页面: missingPages
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});
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setCurrentPage(newPage);
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await loadPages(missingPages, newPage, true); // 静默模式
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} else if (missingPages.length > 0 && hasMore) {
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// 场景B: 目标页未缓存，显示 loading 并等待加载完成
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logger.debug('DynamicNewsCard', '目标页未缓存，显示 loading', {
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currentPage,
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newPage,
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缺失页面: missingPages
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});
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const success = await loadPages(missingPages, newPage, false); // 非静默模式
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if (success) {
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setCurrentPage(newPage);
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}
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} else if (missingPages.length === 0) {
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// 场景C: 所有页面均已缓存，直接切换
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logger.debug('DynamicNewsCard', '无需加载，直接切换', {
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currentPage,
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newPage,
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reason: '所有页面均已缓存'
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});
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setCurrentPage(newPage);
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} else {
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// 场景D: 意外分支（有缺失页面但 hasMore=false）
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logger.warn('DynamicNewsCard', '意外分支：有缺失页面但无法加载', {
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missingPages,
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hasMore,
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currentPage,
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newPage,
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total,
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cachedCount
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});
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setCurrentPage(newPage);
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toast({
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title: '数据不完整',
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description: `第 ${newPage} 页数据可能不完整`,
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status: 'warning',
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duration: TOAST_CONFIG.DURATION_WARNING,
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isClosable: true,
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position: 'top'
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});
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}
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}, [
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currentPage,
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pageSize,
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totalPages,
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hasMore,
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total,
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allCachedEvents.length,
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cachedCount,
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checkTargetPageCache,
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calculatePreloadRange,
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findMissingPages,
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loadPages,
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toast
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]);
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// 模式切换处理
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const handleModeToggle = useCallback((newMode) => {
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if (newMode === mode) return;
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setMode(newMode);
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setCurrentPage(PAGINATION_CONFIG.INITIAL_PAGE);
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const newPageSize = newMode === DISPLAY_MODES.CAROUSEL
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? PAGINATION_CONFIG.CAROUSEL_PAGE_SIZE
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: PAGINATION_CONFIG.GRID_PAGE_SIZE;
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// 检查第1页的数据是否完整（排除 null）
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const firstPageData = allCachedEvents.slice(0, newPageSize);
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const validFirstPageCount = firstPageData.filter(e => e !== null).length;
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const needsRefetch = validFirstPageCount < Math.min(newPageSize, total);
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if (needsRefetch) {
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// 第1页数据不完整，清空缓存重新请求
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dispatch(fetchDynamicNews({
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page: 1,
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per_page: newPageSize,
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pageSize: newPageSize, // 传递 pageSize 确保索引计算一致
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clearCache: true
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}));
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}
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// 如果第1页数据完整，不发起请求，直接切换
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}, [mode, allCachedEvents, total, dispatch]);
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return {
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// 状态
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currentPage,
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mode,
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loadingPage,
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pageSize,
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totalPages,
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hasMore,
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currentPageEvents,
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// 方法
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handlePageChange,
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handleModeToggle
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};
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};
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