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@@ -106,16 +106,9 @@ class _AutoScrollListViewState extends State<AutoScrollListView> {
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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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const StaggeredAutoScrollListView({
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@@ -131,17 +124,22 @@ class StaggeredAutoScrollListView extends StatefulWidget {
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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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+ final int rowCount = 3;
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+ final int loopFactor = 3;
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+
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+ late final List<ScrollController> _controllers;
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+ late final List<Timer?> _timers;
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+ late final List<Timer?> _resumeTimers;
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+ late final List<bool> _isUserScrollingList;
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@override
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void initState() {
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super.initState();
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- for (int i = 0; i < rowCount; i++) {
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- _controllers.add(ScrollController());
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- }
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+ _controllers = List.generate(rowCount, (_) => ScrollController());
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+ _timers = List.generate(rowCount, (_) => null);
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+ _resumeTimers = List.generate(rowCount, (_) => null);
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+ _isUserScrollingList = List.generate(rowCount, (_) => false);
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+
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if (widget.isAutoScrolling) {
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WidgetsBinding.instance.addPostFrameCallback((_) => _startAllScrolls());
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}
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@@ -149,47 +147,68 @@ class _StaggeredAutoScrollListViewState extends State<StaggeredAutoScrollListVie
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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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+ for (final timer in _resumeTimers) {
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+ timer?.cancel();
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+ }
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super.dispose();
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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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- _timers.add(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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- final viewportWidth = controller.position.viewportDimension;
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- final contentWidth = maxExtent + viewportWidth;
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- final originalContentWidth = contentWidth / loopFactor;
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- final offset = next - maxExtent;
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- controller.jumpTo(originalContentWidth + offset);
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- } else {
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- controller.jumpTo(next);
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- }
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- }));
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+ _startScroll(i);
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}
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}
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- @override
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+
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+ void _startScroll(int rowIndex) {
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+ _timers[rowIndex]?.cancel();
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+ _timers[rowIndex] = Timer.periodic(const Duration(milliseconds: 80), (_) {
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+ if (!widget.isAutoScrolling || _isUserScrollingList[rowIndex]) return;
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+
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+ final controller = _controllers[rowIndex];
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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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+ final viewportWidth = controller.position.viewportDimension;
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+ final contentWidth = maxExtent + viewportWidth;
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+ final originalContentWidth = contentWidth / loopFactor;
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+ final offset = next - maxExtent;
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+ controller.jumpTo(originalContentWidth + offset);
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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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+
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+ void _onUserScroll(int rowIndex) {
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+ if (_isUserScrollingList[rowIndex]) return;
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+
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+ _isUserScrollingList[rowIndex] = true;
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+ _timers[rowIndex]?.cancel();
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+ _timers[rowIndex] = null;
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+
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+ _resumeTimers[rowIndex]?.cancel();
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+ _resumeTimers[rowIndex] = Timer(const Duration(seconds: 1), () {
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+ _isUserScrollingList[rowIndex] = false;
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+ if (widget.isAutoScrolling) {
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+ _startScroll(rowIndex);
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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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final actualItemsPerRow = (widget.itemCount / rowCount).ceil();
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+
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return Column(
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children: List.generate(rowCount, (rowIndex) {
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final startIndex = rowIndex * actualItemsPerRow;
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@@ -199,14 +218,24 @@ class _StaggeredAutoScrollListViewState extends State<StaggeredAutoScrollListVie
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rowItems.length * loopFactor,
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(i) => rowItems[i % rowItems.length],
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);
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+
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return SizedBox(
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- height: 50.w,
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- child: ListView.builder(
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- controller: _controllers[rowIndex],
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- scrollDirection: Axis.horizontal,
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- padding: widget.padding,
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- itemCount: extendedItems.length,
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- itemBuilder: (context, index) => widget.itemBuilder(context, extendedItems[index]),
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+ height: 50.w, // 使用你自己的高度或比例
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+ child: NotificationListener<UserScrollNotification>(
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+ onNotification: (notification) {
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+ if (notification.direction != ScrollDirection.idle) {
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+ _onUserScroll(rowIndex);
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+ }
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+ return false;
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+ },
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+ child: ListView.builder(
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+ controller: _controllers[rowIndex],
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+ scrollDirection: Axis.horizontal,
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+ padding: widget.padding,
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+ itemCount: extendedItems.length,
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+ itemBuilder: (context, index) =>
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+ widget.itemBuilder(context, extendedItems[index]),
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+ ),
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),
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);
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}),
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云天逵