406 lines
12 KiB
Dart
406 lines
12 KiB
Dart
import 'dart:math' as math;
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import 'dart:ui' as ui;
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import 'package:flutter/material.dart';
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import 'package:flutter/physics.dart';
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import 'glass_refraction.dart';
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class GlassDock extends StatefulWidget {
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const GlassDock({
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super.key,
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required this.selectedIndex,
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required this.onSelected,
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});
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final int selectedIndex;
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final ValueChanged<int> onSelected;
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@override
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State<GlassDock> createState() => _GlassDockState();
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}
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class _GlassDockState extends State<GlassDock> with TickerProviderStateMixin {
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static const _width = 264.0, _height = 68.0, _inset = 3.0, _travel = 86.0;
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static const _blue = Color(0xFF007AFF);
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late final AnimationController _motion = AnimationController.unbounded(
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vsync: this,
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value: widget.selectedIndex.toDouble(),
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);
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late final AnimationController _press = AnimationController.unbounded(
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vsync: this,
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value: 0,
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);
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bool _reduceMotion = false;
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late int _targetIndex;
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bool _elasticMotion = false;
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@override
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void initState() {
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super.initState();
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_targetIndex = widget.selectedIndex;
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}
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double get _pressure => _press.value.clamp(0.0, 1.18);
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void _pressTo(double target) {
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if (_reduceMotion) {
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_press.value = target;
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return;
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}
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_press.animateWith(
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SpringSimulation(
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const SpringDescription(mass: 1, stiffness: 440, damping: 17),
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_press.value,
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target,
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_press.velocity,
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),
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);
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}
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@override
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void didChangeDependencies() {
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super.didChangeDependencies();
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_reduceMotion = MediaQuery.disableAnimationsOf(context);
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}
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double? _drag;
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double _dragSpeed = 0;
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double get _position => _drag ?? _motion.value.clamp(-0.12, 2.12);
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void _moveTo(int index, {bool elastic = false, double velocity = 0}) {
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_targetIndex = index;
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_elasticMotion = elastic && !_reduceMotion;
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if (_reduceMotion) {
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_motion.value = index.toDouble();
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return;
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}
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if (elastic) {
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_motion.animateWith(
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SpringSimulation(
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const SpringDescription(mass: 1, stiffness: 380, damping: 19),
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_position,
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index.toDouble(),
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velocity.clamp(-8, 8),
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),
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);
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} else {
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_motion.animateTo(
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index.toDouble(),
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duration: const Duration(milliseconds: 320),
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curve: Curves.easeOutCubic,
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);
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}
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}
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void _select(int index, {bool elastic = false, double velocity = 0}) {
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final position = _position;
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setState(() => _drag = null);
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_motion.value = position;
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_moveTo(index, elastic: elastic, velocity: velocity);
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_pressTo(0);
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widget.onSelected(index);
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}
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@override
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void didUpdateWidget(GlassDock oldWidget) {
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super.didUpdateWidget(oldWidget);
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// The parent acknowledges onSelected with a rebuild. Restarting here used
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// to erase the release velocity and start a second spring for the same tab.
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if (widget.selectedIndex != _targetIndex && _drag == null) {
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_moveTo(widget.selectedIndex);
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}
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}
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@override
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void dispose() {
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_motion.dispose();
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_press.dispose();
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super.dispose();
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}
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Widget _glass({required Widget child, bool lens = false}) {
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final pressure = _pressure.clamp(0.0, 1.0);
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final content = CustomPaint(
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foregroundPainter: _GlassRimPainter(lens: lens, pressure: pressure),
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child: DecoratedBox(
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decoration: BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.topLeft,
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end: Alignment.bottomRight,
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colors: lens
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? [
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Color.lerp(
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const Color(0xFFA1A4AA).withValues(alpha: 0.34),
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const Color(0xFFD8DBE0).withValues(alpha: 0.0252),
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pressure,
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)!,
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Color.lerp(
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const Color(0xFF8E939B).withValues(alpha: 0.26),
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const Color(0xFFC3C7CE).withValues(alpha: 0.0144),
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pressure,
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)!,
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Color.lerp(
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const Color(0xFFB4B7BC).withValues(alpha: 0.32),
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const Color(0xFFE5E7EB).withValues(alpha: 0.0216),
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pressure,
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)!,
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]
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: [
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Colors.white.withValues(alpha: 0.05),
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_blue.withValues(alpha: 0.008),
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Colors.white.withValues(alpha: 0.018),
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],
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),
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),
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child: child,
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),
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);
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return ClipRRect(
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borderRadius: BorderRadius.circular(40),
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child: GlassRefraction(
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strength: lens ? 0.70 + pressure * 0.70 : 0.95,
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blurSigma: lens ? 1.6 - pressure * 0.6 : 1.4,
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child: content,
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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) => AnimatedBuilder(
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animation: Listenable.merge([_motion, _press]),
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builder: (context, _) {
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final press = _pressure;
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final speed = _reduceMotion
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? 0.0
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: (_drag != null
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? _dragSpeed
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: _elasticMotion
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? _motion.velocity
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: 0.0)
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.abs();
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final stretch = (speed / 16).clamp(0.0, 0.14) + press * 0.30;
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final lensWidth = _travel * (1 + stretch);
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final lensHeight =
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(_height - _inset * 2) *
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(1 + press * 0.31 - (speed / 16).clamp(0.0, 0.07));
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return SizedBox(
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width: _width,
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height: _height,
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child: DecoratedBox(
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decoration: BoxDecoration(
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borderRadius: BorderRadius.circular(40),
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boxShadow: [
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BoxShadow(
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color: const Color(0xFF4C6078).withValues(alpha: 0.075),
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blurRadius: 16,
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offset: const Offset(0, 5),
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),
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],
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),
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child: Stack(
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clipBehavior: Clip.none,
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children: [
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Positioned.fill(child: _glass(child: const SizedBox.expand())),
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Positioned(
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left: (_inset + _position * _travel - (lensWidth - _travel) / 2)
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.clamp(1.0, _width - lensWidth - 1),
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top: (_height - lensHeight) / 2,
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width: lensWidth,
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height: lensHeight,
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child: IgnorePointer(
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child: _glass(lens: true, child: const SizedBox.expand()),
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),
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),
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Positioned(
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left: _inset,
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right: _inset,
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top: _inset,
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bottom: _inset,
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child: Row(
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children: [
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_item(0, Icons.calendar_month_rounded, '课表'),
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_item(1, Icons.assignment_rounded, '考试'),
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_item(2, Icons.person_rounded, '个人设置'),
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],
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),
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),
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],
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),
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),
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);
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},
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);
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Widget _item(int index, IconData icon, String label) => Expanded(
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child: Semantics(
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label: label,
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button: true,
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selected: index == widget.selectedIndex,
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excludeSemantics: true,
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onTap: () => _select(index),
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child: GestureDetector(
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key: index == widget.selectedIndex ? const Key('dock-cursor') : null,
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behavior: HitTestBehavior.opaque,
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onTapDown: index == widget.selectedIndex ? (_) => _pressTo(1) : null,
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onTapCancel: () {
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if (_drag == null) _pressTo(0);
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},
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onTap: () => _select(index),
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onHorizontalDragStart: index == widget.selectedIndex
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? (_) {
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final start = _position.clamp(0.0, 2.0);
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_motion.stop();
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_pressTo(1);
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setState(() {
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_drag = start;
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_dragSpeed = 0;
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});
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}
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: null,
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onHorizontalDragUpdate: index == widget.selectedIndex
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? (details) => setState(() {
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_dragSpeed = details.delta.dx / _travel * 60;
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_drag = (_position + details.delta.dx / _travel).clamp(
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0.0,
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2.0,
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);
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})
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: null,
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onHorizontalDragEnd: index == widget.selectedIndex
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? (details) => _select(
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_position.round().clamp(0, 2),
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elastic: true,
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velocity: details.velocity.pixelsPerSecond.dx / _travel,
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)
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: null,
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onHorizontalDragCancel: index == widget.selectedIndex
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? () {
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if (!mounted) return;
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final position = _position;
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setState(() => _drag = null);
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_motion.value = position;
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_moveTo(widget.selectedIndex, elastic: true);
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_pressTo(0);
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}
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: null,
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child: Center(
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child: AnimatedScale(
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scale: index == _position.round().clamp(0, 2)
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? 1 + _pressure * 0.08
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: 1,
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duration: const Duration(milliseconds: 130),
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child: Icon(
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icon,
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size: 27,
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color: index == _position.round().clamp(0, 2)
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? _blue
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: _blue.withValues(alpha: 0.48),
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),
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),
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),
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),
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),
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);
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}
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/// A diffuse silver bevel and thin directional glints show optical thickness.
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/// The painted highlights stay on the edge so background colour passes through.
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class _GlassRimPainter extends CustomPainter {
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const _GlassRimPainter({required this.lens, required this.pressure});
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final bool lens;
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final double pressure;
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@override
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void paint(Canvas canvas, Size size) {
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final edge = lens ? const Color(0xFF7B838F) : const Color(0xFFAFBECF);
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// A quiet grey selection at rest; the glossy lens rim returns on touch.
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final opacity = lens ? 0.25 + pressure * 0.75 : 1.0;
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final bounds = Offset.zero & size;
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final outer = RRect.fromRectAndRadius(
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bounds.deflate(0.7),
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Radius.circular(size.height / 2),
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);
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final inner = RRect.fromRectAndRadius(
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bounds.deflate(2.2),
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Radius.circular(size.height / 2 - 1.5),
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);
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canvas.drawRRect(
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outer,
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Paint()
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..style = PaintingStyle.stroke
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..strokeWidth = lens ? 1.8 : 2.2
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..maskFilter = MaskFilter.blur(BlurStyle.normal, lens ? 0.9 : 0.45)
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..shader = ui.Gradient.linear(
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bounds.topLeft,
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bounds.bottomRight,
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[
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Colors.white.withValues(alpha: 0.24 * opacity),
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edge.withValues(alpha: 0.04 * opacity),
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Colors.white.withValues(alpha: 0.14 * opacity),
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],
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[0.0, 0.55, 1.0],
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),
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);
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canvas.drawRRect(
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outer,
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Paint()
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..style = PaintingStyle.stroke
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..strokeWidth = lens ? 1.25 : 1.1
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..shader = ui.Gradient.sweep(
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bounds.center,
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[
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Colors.white.withValues(alpha: 0.96 * opacity),
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edge.withValues(alpha: (lens ? 0.30 : 0.15) * opacity),
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Colors.white.withValues(alpha: 0.10 * opacity),
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Colors.white.withValues(alpha: 0.94 * opacity),
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edge.withValues(alpha: 0.12 * opacity),
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Colors.white.withValues(alpha: 0.96 * opacity),
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],
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[0.0, 0.18, 0.38, 0.60, 0.80, 1.0],
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TileMode.clamp,
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-math.pi / 2,
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math.pi * 1.5,
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),
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);
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canvas.drawRRect(
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inner,
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Paint()
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..style = PaintingStyle.stroke
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..strokeWidth = 0.7
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..shader = ui.Gradient.linear(
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bounds.topLeft,
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bounds.bottomRight,
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[
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Colors.white.withValues(alpha: 0.20 * opacity),
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edge.withValues(alpha: (lens ? 0.13 : 0.07) * opacity),
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Colors.white.withValues(alpha: 0.28 * opacity),
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],
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[0.0, 0.5, 1.0],
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),
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);
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final shine = Path()
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..moveTo(size.height * 0.32, 4)
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..quadraticBezierTo(
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size.width * 0.5,
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1.8,
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size.width - size.height * 0.35,
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4,
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);
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canvas.drawPath(
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shine,
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Paint()
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..style = PaintingStyle.stroke
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..strokeCap = StrokeCap.round
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..strokeWidth = 0.8
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..shader = ui.Gradient.linear(
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Offset.zero,
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Offset(size.width, 0),
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[
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Colors.white.withValues(alpha: 0),
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Colors.white.withValues(alpha: 0.50 * opacity),
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Colors.white.withValues(alpha: 0),
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],
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[0.0, 0.5, 1.0],
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),
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);
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}
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@override
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bool shouldRepaint(_GlassRimPainter oldDelegate) =>
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oldDelegate.lens != lens || oldDelegate.pressure != pressure;
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}
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