[fit]1.修复自动滚动出现重复的问题

lib/widget/auto_scroll_list_view.dart

@@ -139,18 +139,11 @@ class _StaggeredAutoScrollListViewState extends State<StaggeredAutoScrollListVie
   @override
   void initState() {
     super.initState();
-
-    // 初始化每一行的滚动控制器
     for (int i = 0; i < rowCount; i++) {
-      final controller = ScrollController();
-      _controllers.add(controller);
+      _controllers.add(ScrollController());
     }
-
-    // 如果启用自动滚动，则在渲染后启动滚动逻辑
     if (widget.isAutoScrolling) {
-      WidgetsBinding.instance.addPostFrameCallback((_) {
-        _startAllScrolls();
-      });
+      WidgetsBinding.instance.addPostFrameCallback((_) => _startAllScrolls());
     }
   }
 
@@ -173,9 +166,7 @@ class _StaggeredAutoScrollListViewState extends State<StaggeredAutoScrollListVie
   void _startAllScrolls() {
     for (int i = 0; i < rowCount; i++) {
       final controller = _controllers[i];
-
-      // 每 50ms 滚动一次，实现平滑向右滚动效果
-      final timer = Timer.periodic(const Duration(milliseconds: 50), (_) {
+      _timers.add(Timer.periodic(const Duration(milliseconds: 50), (_) {
         if (!controller.hasClients) return;
 
         final maxExtent = controller.position.maxScrollExtent;
@@ -183,39 +174,39 @@ class _StaggeredAutoScrollListViewState extends State<StaggeredAutoScrollListVie
         final next = current + 1;
 
         if (next >= maxExtent) {
-          // 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
-          controller.jumpTo(maxExtent / 2);
+          final viewportWidth = controller.position.viewportDimension;
+          final contentWidth = maxExtent + viewportWidth;
+          final originalContentWidth = contentWidth / loopFactor;
+          final offset = next - maxExtent;
+          controller.jumpTo(originalContentWidth + offset);
         } else {
           controller.jumpTo(next);
         }
-      });
-
-      _timers.add(timer);
+      }));
     }
   }
+  @override
 
   @override
   Widget build(BuildContext context) {
-    // 每一行应显示的实际数据项数（取整向上）
     final actualItemsPerRow = (widget.itemCount / rowCount).ceil();
-
-    // 每一行扩展后的 item 数量（用于循环滚动）
-    final extendedItemsPerRow = actualItemsPerRow * loopFactor;
-
     return Column(
       children: List.generate(rowCount, (rowIndex) {
+        final startIndex = rowIndex * actualItemsPerRow;
+        final endIndex = (startIndex + actualItemsPerRow).clamp(0, widget.itemCount);
+        final rowItems = List.generate(endIndex - startIndex, (i) => startIndex + i);
+        final extendedItems = List.generate(
+          rowItems.length * loopFactor,
+              (i) => rowItems[i % rowItems.length],
+        );
         return SizedBox(
-          height: 50.w, // 每行高度，单位为屏幕适配宽度
+          height: 50.w,
           child: ListView.builder(
-            controller: _controllers[rowIndex], // 设置对应行的滚动控制器
+            controller: _controllers[rowIndex],
             scrollDirection: Axis.horizontal,
             padding: widget.padding,
-            itemCount: extendedItemsPerRow, // 扩展后的数量，制造无限滚动感
-            itemBuilder: (context, index) {
-              // 计算实际要展示的数据项索引
-              final itemIndex = (rowIndex * actualItemsPerRow + index) % widget.itemCount;
-              return widget.itemBuilder(context, itemIndex);
-            },
+            itemCount: extendedItems.length,
+            itemBuilder: (context, index) => widget.itemBuilder(context, extendedItems[index]),
           ),
         );
       }),