119 lines
3.1 KiB
Dart
119 lines
3.1 KiB
Dart
import 'dart:async';
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import 'dart:math';
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import 'package:aves/widgets/common/basic/draggable_scrollbar/notifications.dart';
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import 'package:flutter/material.dart';
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class FloatingNavBar extends StatefulWidget {
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final ScrollController? scrollController;
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final Stream<DraggableScrollbarEvent> events;
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final double childHeight;
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final Widget child;
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const FloatingNavBar({
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super.key,
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required this.scrollController,
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required this.events,
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required this.childHeight,
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required this.child,
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});
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@override
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State<FloatingNavBar> createState() => _FloatingNavBarState();
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}
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class _FloatingNavBarState extends State<FloatingNavBar> with SingleTickerProviderStateMixin {
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final List<StreamSubscription> _subscriptions = [];
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late AnimationController _controller;
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late Animation<Offset> _offsetAnimation;
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double? _lastOffset;
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bool _isDragging = false;
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@override
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void initState() {
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super.initState();
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_controller = AnimationController(
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duration: const Duration(milliseconds: 200),
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vsync: this,
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);
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_offsetAnimation = Tween<Offset>(
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begin: const Offset(0, 0),
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end: const Offset(0, 1),
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).animate(CurvedAnimation(
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parent: _controller,
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curve: Curves.linear,
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))
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..addListener(() {
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if (!mounted) return;
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setState(() {});
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});
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_registerWidget(widget);
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}
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@override
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void didUpdateWidget(covariant FloatingNavBar oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (oldWidget.scrollController != widget.scrollController) {
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_unregisterWidget(oldWidget);
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_registerWidget(widget);
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}
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}
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@override
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void dispose() {
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_unregisterWidget(widget);
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super.dispose();
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}
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void _registerWidget(FloatingNavBar widget) {
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_lastOffset = null;
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widget.scrollController?.addListener(_onScrollChanged);
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_subscriptions.add(widget.events.listen(_onDraggableScrollBarEvent));
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}
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void _unregisterWidget(FloatingNavBar widget) {
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widget.scrollController?.removeListener(_onScrollChanged);
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_subscriptions
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..forEach((sub) => sub.cancel())
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..clear();
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}
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@override
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Widget build(BuildContext context) {
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return SlideTransition(
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position: _offsetAnimation,
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child: widget.child,
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);
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}
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void _onScrollChanged() {
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final scrollController = widget.scrollController;
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if (scrollController == null) return;
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final offset = scrollController.offset;
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final delta = offset - (_lastOffset ?? offset);
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_lastOffset = offset;
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double? newValue;
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final childHeight = widget.childHeight;
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final after = scrollController.position.extentAfter;
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if (after < childHeight && delta > 0) {
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newValue = min(_controller.value, after / childHeight);
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} else if (!_isDragging || delta > 0) {
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newValue = _controller.value + delta / childHeight;
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}
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if (newValue != null) {
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_controller.value = newValue.clamp(0.0, 1.0);
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}
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}
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void _onDraggableScrollBarEvent(DraggableScrollbarEvent event) {
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switch (event) {
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case DraggableScrollbarEvent.dragStart:
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_isDragging = true;
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case DraggableScrollbarEvent.dragEnd:
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_isDragging = false;
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}
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}
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}
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