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lib/widgets/shared/scroll_position.dart

@@ -0,0 +1,66 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+enum ScrollState {
+  top,
+  middle,
+  bottom,
+}
+
+class ScrollStatePosition extends ConsumerStatefulWidget {
+  final ScrollController? controller;
+  final Widget Function(ScrollState state) positionBuilder;
+
+  const ScrollStatePosition({
+    this.controller,
+    required this.positionBuilder,
+    super.key,
+  });
+
+  @override
+  ConsumerState<ConsumerStatefulWidget> createState() => _ScrollStatePositionState();
+}
+
+class _ScrollStatePositionState extends ConsumerState<ScrollStatePosition> {
+  late final scrollController = widget.controller ?? ScrollController();
+  ScrollState scrollState = ScrollState.top;
+
+  @override
+  void initState() {
+    super.initState();
+    scrollController.addListener(listen);
+  }
+
+  @override
+  void dispose() {
+    scrollController.removeListener(listen);
+    super.dispose();
+  }
+
+  void listen() {
+    if (scrollController.offset < scrollController.position.maxScrollExtent) {
+      if (scrollController.position.atEdge) {
+        bool isTop = scrollController.position.pixels == 0;
+        if (isTop) {
+          setState(() {
+            scrollState = ScrollState.top;
+          });
+          print('At the top');
+        } else {
+          setState(() {
+            scrollState = ScrollState.bottom;
+          });
+        }
+      } else {
+        setState(() {
+          scrollState = ScrollState.middle;
+        });
+      }
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return widget.positionBuilder(scrollState);
+  }
+}