63 lines
1.6 KiB
Dart
63 lines
1.6 KiB
Dart
import 'package:flutter/material.dart';
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class AnimatedScrollBorder extends StatefulWidget {
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final ScrollController scrollController;
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const AnimatedScrollBorder({
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super.key,
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required this.scrollController,
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});
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@override
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State<AnimatedScrollBorder> createState() => _AnimatedScrollBorderState();
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}
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class _AnimatedScrollBorderState extends State<AnimatedScrollBorder> {
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bool _isScrolled = false;
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@override
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void initState() {
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super.initState();
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widget.scrollController.addListener(_updateScrollState);
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_updateScrollState(); // Initial check
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}
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@override
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void didUpdateWidget(AnimatedScrollBorder oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (widget.scrollController != oldWidget.scrollController) {
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oldWidget.scrollController.removeListener(_updateScrollState);
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widget.scrollController.addListener(_updateScrollState);
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_updateScrollState(); // Initial check for new controller
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}
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}
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@override
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void dispose() {
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widget.scrollController.removeListener(_updateScrollState);
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super.dispose();
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}
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void _updateScrollState() {
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if (!mounted) return;
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setState(() {
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_isScrolled = widget.scrollController.hasClients &&
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widget.scrollController.offset > 0;
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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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return AnimatedSwitcher(
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switchInCurve: Curves.easeOut,
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switchOutCurve: Curves.easeIn,
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duration: const Duration(milliseconds: 200),
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child: _isScrolled
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? const Divider()
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: Divider(
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key: ValueKey(_isScrolled),
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color: Colors.transparent,
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),
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);
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}
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}
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