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@@ -2,6 +2,7 @@ import 'dart:async';
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import 'package:flutter/cupertino.dart';
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import 'package:flutter/rendering.dart';
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+import 'package:flutter_screenutil/flutter_screenutil.dart';
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class AutoScrollListView extends StatefulWidget {
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final NullableIndexedWidgetBuilder itemBuilder;
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@@ -100,3 +101,124 @@ class _AutoScrollListViewState extends State<AutoScrollListView> {
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);
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}
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}
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+
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+
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+// 多行横向自动滚动列表
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+/// 一个支持自动滚动的多行横向列表，每一行自动向右滚动（模拟跑马灯效果）
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+class StaggeredAutoScrollListView extends StatefulWidget {
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+ /// 子项构建器（需根据 itemIndex 构建对应组件）
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+ final NullableIndexedWidgetBuilder itemBuilder;
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+
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+ /// 实际数据项数量（不是扩展后的数量）
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+ final int itemCount;
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+
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+ /// 每行的内边距
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+ final EdgeInsetsGeometry? padding;
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+
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+ /// 是否启用自动滚动
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+ final bool isAutoScrolling;
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+
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+ const StaggeredAutoScrollListView({
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+ super.key,
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+ required this.itemBuilder,
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+ required this.itemCount,
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+ this.padding,
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+ this.isAutoScrolling = true,
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+ });
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+
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+ @override
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+ State<StaggeredAutoScrollListView> createState() => _StaggeredAutoScrollListViewState();
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+}
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+
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+class _StaggeredAutoScrollListViewState extends State<StaggeredAutoScrollListView> {
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+ final int rowCount = 3; // 列表的总行数
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+ final List<ScrollController> _controllers = []; // 每一行的滚动控制器
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+ final List<Timer?> _timers = []; // 每一行对应的自动滚动定时器
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+ final int loopFactor = 3; // 每行内容扩展的倍数，防止滚动过短
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+
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+ @override
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+ void initState() {
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+ super.initState();
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+
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+ // 初始化每一行的滚动控制器
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+ for (int i = 0; i < rowCount; i++) {
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+ final controller = ScrollController();
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+ _controllers.add(controller);
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+ }
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+
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+ // 如果启用自动滚动，则在渲染后启动滚动逻辑
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+ if (widget.isAutoScrolling) {
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+ WidgetsBinding.instance.addPostFrameCallback((_) {
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+ _startAllScrolls();
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+ });
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+ }
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+ }
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+
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+ @override
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+ void dispose() {
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+ // 销毁滚动控制器
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+ for (final controller in _controllers) {
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+ controller.dispose();
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+ }
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+
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+ // 取消所有定时器
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+ for (final timer in _timers) {
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+ timer?.cancel();
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+ }
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+
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+ super.dispose();
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+ }
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+
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+ /// 启动所有行的自动滚动
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+ void _startAllScrolls() {
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+ for (int i = 0; i < rowCount; i++) {
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+ final controller = _controllers[i];
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+
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+ // 每 50ms 滚动一次，实现平滑向右滚动效果
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+ final timer = Timer.periodic(const Duration(milliseconds: 50), (_) {
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+ if (!controller.hasClients) return;
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+
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+ final maxExtent = controller.position.maxScrollExtent;
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+ final current = controller.position.pixels;
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+ final next = current + 1;
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+
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+ if (next >= maxExtent) {
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+ // 若滚动到底部，则跳转到中间，避免突然回到顶部产生视觉跳变
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+ controller.jumpTo(maxExtent / 2);
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+ } else {
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+ controller.jumpTo(next);
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+ }
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+ });
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+
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+ _timers.add(timer);
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+ }
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+ }
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+
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+ @override
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+ Widget build(BuildContext context) {
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+ // 每一行应显示的实际数据项数（取整向上）
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+ final actualItemsPerRow = (widget.itemCount / rowCount).ceil();
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+
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+ // 每一行扩展后的 item 数量（用于循环滚动）
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+ final extendedItemsPerRow = actualItemsPerRow * loopFactor;
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+
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+ return Column(
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+ children: List.generate(rowCount, (rowIndex) {
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+ return SizedBox(
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+ height: 50.w, // 每行高度，单位为屏幕适配宽度
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+ child: ListView.builder(
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+ controller: _controllers[rowIndex], // 设置对应行的滚动控制器
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+ scrollDirection: Axis.horizontal,
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+ padding: widget.padding,
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+ itemCount: extendedItemsPerRow, // 扩展后的数量，制造无限滚动感
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+ itemBuilder: (context, index) {
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+ // 计算实际要展示的数据项索引
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+ final itemIndex = (rowIndex * actualItemsPerRow + index) % widget.itemCount;
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+ return widget.itemBuilder(context, itemIndex);
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+ },
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+ ),
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+ );
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+ }),
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+ );
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+ }
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+}
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云天逵