723 lines
24 KiB
Dart
723 lines
24 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 'package:flutter/scheduler.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 _height = 58.0, _inset = 3.0;
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double _width = 264;
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double get _travel => (_width - _inset * 2) / 3;
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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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late final AnimationController _tap = AnimationController(
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vsync: this,
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duration: const Duration(milliseconds: 560),
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);
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late final AnimationController _sway = AnimationController.unbounded(
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vsync: this,
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);
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late final AnimationController _ripple = AnimationController(
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vsync: this,
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duration: const Duration(milliseconds: 620),
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);
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void _wakeRipple() {
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if (!_reduceMotion && !_ripple.isAnimating) _ripple.forward(from: 0);
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}
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double _swayTarget = 0, _swayVelocity = 0, _dragTarget = 0, _dragVelocity = 0;
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Duration? _elasticLastTick;
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late final Ticker _elasticTicker = createTicker(_tickElastic);
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void _startElastic() {
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if (!_elasticTicker.isActive) {
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_elasticLastTick = null;
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_elasticTicker.start();
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}
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}
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// Keep one clock alive while input changes its targets. Restarting a spring
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// on every pointer event repeatedly paints t=0 under continuous dragging.
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void _tickElastic(Duration elapsed) {
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final seconds = _elasticLastTick == null
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? 1 / 60
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: ((elapsed - _elasticLastTick!).inMicroseconds / 1000000).clamp(
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0.0,
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0.25,
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);
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_elasticLastTick = elapsed;
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final sway = _advanceSpring(
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_sway.value,
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_swayVelocity,
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_swayTarget,
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220,
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18,
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seconds,
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);
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final drag = _advanceSpring(
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_dragFollow.value,
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_dragVelocity,
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_dragTarget,
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680,
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28,
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seconds,
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);
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_swayVelocity = sway.$2;
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_dragVelocity = drag.$2;
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_sway.value = sway.$1;
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_dragFollow.value = drag.$1;
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if ((_sway.value - _swayTarget).abs() < 0.0005 &&
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_swayVelocity.abs() < 0.005 &&
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(_dragFollow.value - _dragTarget).abs() < 0.0005 &&
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_dragVelocity.abs() < 0.005) {
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_sway.value = _swayTarget;
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_dragFollow.value = _dragTarget;
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_swayVelocity = _dragVelocity = 0;
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_elasticTicker.stop();
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_elasticLastTick = null;
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}
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}
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(double, double) _advanceSpring(
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double value,
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double velocity,
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double target,
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double stiffness,
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double damping,
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double seconds,
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) {
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final steps = math.max(1, (seconds * 120).ceil());
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final step = seconds / steps;
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for (var i = 0; i < steps; i++) {
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velocity += (stiffness * (target - value) - damping * velocity) * step;
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value += velocity * step;
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}
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return (value, velocity);
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}
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void _swayTo(double target) {
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_swayTarget = _reduceMotion ? 0 : target;
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if (_reduceMotion) {
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_sway.value = 0;
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_swayVelocity = 0;
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return;
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}
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_startElastic();
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}
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bool _reduceMotion = false;
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late int _targetIndex;
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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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_dragTarget = widget.selectedIndex.toDouble();
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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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if (_reduceMotion) {
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_motion.value = widget.selectedIndex.toDouble();
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_press.value = 0;
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_tap.value = 0;
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_ripple.value = 0;
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_elasticTicker.stop();
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_elasticLastTick = null;
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_swayTarget = _swayVelocity = _dragVelocity = 0;
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_dragTarget = _drag ?? widget.selectedIndex.toDouble();
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_dragFollow.value = _drag ?? widget.selectedIndex.toDouble();
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_sway.value = 0;
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}
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}
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late final AnimationController _dragFollow = AnimationController.unbounded(
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vsync: this,
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value: widget.selectedIndex.toDouble(),
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);
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void _followDragTo(double target) {
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_dragTarget = target;
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if (_reduceMotion) {
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_dragFollow.value = target;
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_dragVelocity = 0;
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return;
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}
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_startElastic();
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}
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double? _drag;
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double _dragSpeed = 0;
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double get _position =>
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(_drag != null ? _dragFollow.value : _motion.value).clamp(-0.12, 2.12);
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void _moveTo(int index, {double velocity = 0, bool springyTap = false}) {
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_targetIndex = index;
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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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_motion.animateWith(
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SpringSimulation(
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springyTap
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? const SpringDescription(mass: 1, stiffness: 350, damping: 22)
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: const SpringDescription(mass: 1, stiffness: 360, damping: 26),
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_position,
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index.toDouble(),
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velocity,
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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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final releaseVelocity = elastic
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? velocity.clamp(-8.0, 8.0)
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: _motion.velocity;
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setState(() => _drag = null);
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_motion.value = position;
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_moveTo(index, velocity: releaseVelocity, springyTap: !elastic);
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// Retarget the position spring without resetting an in-flight size pulse.
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// Restarting that pulse at its peak made the glass edges jump on quick taps.
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if (!elastic && !_reduceMotion && !_tap.isAnimating) {
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_tap.forward(from: 0);
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}
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_pressTo(0);
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_swayTo(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, velocity: _motion.velocity);
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}
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}
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@override
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void dispose() {
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_elasticTicker.dispose();
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_motion.dispose();
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_press.dispose();
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_tap.dispose();
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_sway.dispose();
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_ripple.dispose();
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_dragFollow.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: 0.28),
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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: 0.21),
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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: 0.26),
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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: 0.29),
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const Color(0xFFFDFEFF).withValues(alpha: 0.17),
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Colors.white.withValues(alpha: 0.23),
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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 ? 0.78 + pressure * 0.70 : 0.98,
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blurSigma: lens ? 1.6 - pressure * 0.6 : 1.5,
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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) => LayoutBuilder(
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builder: (context, constraints) {
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_width = math.min(
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constraints.maxWidth,
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MediaQuery.sizeOf(context).width >= 600 ? 300.0 : 264.0,
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);
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return AnimatedBuilder(
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animation: Listenable.merge([
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_motion,
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_press,
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_tap,
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_sway,
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_ripple,
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_dragFollow,
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]),
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builder: (context, _) {
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final press = _pressure;
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final pulse = _reduceMotion ? 0.0 : math.sin(math.pi * _tap.value);
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// Travel stretches horizontally; landing squeezes then rebounds
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// vertically. Endpoints are zero so quick retargets remain continuous.
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final tapWave = _reduceMotion
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? 0.0
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: math.sin(2 * math.pi * _tap.value);
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final tapStretch = tapWave >= 0 ? tapWave * 0.24 : tapWave * 0.065;
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final tapRise = tapWave >= 0 ? -tapWave * 0.045 : -tapWave * 0.15;
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// Pointer movement wakes a finite ripple; pauses do not start idle loops.
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final dragWave = _reduceMotion
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? 0.0
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: math.sin(2 * math.pi * _ripple.value) * press.clamp(0.0, 1.0);
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final dragStretch = dragWave * (dragWave >= 0 ? 0.10 : 0.06);
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final speed = _reduceMotion
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? 0.0
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: (_drag != null ? _dragSpeed : _motion.velocity).abs();
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final stretch =
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(speed / 80).clamp(0.0, 0.08) +
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tapStretch +
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press * 0.30 +
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dragStretch;
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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 +
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press * 0.31 +
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tapRise -
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dragWave * 0.08 -
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(speed / 180).clamp(0.0, 0.035));
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// Resize real glass bounds: sampling stays aligned without scaling text.
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final sway = _reduceMotion ? 0.0 : _sway.value.clamp(-1.2, 1.2);
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final bodyGrowth = press * 12 + pulse * 3 + sway.abs() * 4;
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final bodyHeight =
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_height + press * 5 + pulse * 1.5 - sway.abs() * 0.8;
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final dockShift = sway * 8;
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final leadingPull = sway * 6;
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return SizedBox(
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width: _width,
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height: _height,
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child: Stack(
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clipBehavior: Clip.none,
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children: [
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Positioned(
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left: dockShift,
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top: 0,
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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)
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.withValues(alpha: 0.05),
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blurRadius: 14,
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offset: const Offset(0, 4),
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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(
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left: -bodyGrowth / 2 + math.min(leadingPull, 0),
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top: (_height - bodyHeight) / 2,
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width: _width + bodyGrowth + leadingPull.abs(),
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height: bodyHeight,
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child: _glass(child: const SizedBox.expand()),
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),
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Positioned(
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left:
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(_inset +
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_position * _travel -
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(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(
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lens: true,
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child: const SizedBox.expand(),
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),
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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(
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2,
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Icons.person_rounded,
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'个人设置',
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caption: '我的',
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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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),
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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, {String? caption}) =>
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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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// Selection must not replace the symbol's active animation state.
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key: ValueKey('dock-item-$index'),
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behavior: HitTestBehavior.opaque,
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onTapDown: index == widget.selectedIndex
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? (_) => _pressTo(_reduceMotion ? 0 : 1)
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: 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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_dragFollow.value = start;
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_dragTarget = start;
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_dragVelocity = _motion.velocity;
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_motion.stop();
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_wakeRipple();
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_pressTo(_reduceMotion ? 0 : 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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_wakeRipple();
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_swayTo((_dragSpeed / 8).clamp(-1.0, 1.0));
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_drag = (_drag! + 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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_followDragTo(_drag!);
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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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(_drag ?? _position).round().clamp(0, 2),
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elastic: true,
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velocity: _dragVelocity,
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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, velocity: _dragVelocity);
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_pressTo(0);
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_swayTo(0);
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}
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: null,
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child: Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
|
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children: [
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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: _DockSymbol(
|
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active: (_position - index).abs() < 0.28,
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reduceMotion: _reduceMotion,
|
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child: Icon(
|
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icon,
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key: index == widget.selectedIndex
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? const Key('dock-cursor')
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: null,
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size: 25,
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color: index == _position.round().clamp(0, 2)
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? _blue
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: _blue.withValues(alpha: 0.72),
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shadows: [
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Shadow(
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color: Colors.white.withValues(
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alpha: index == _position.round().clamp(0, 2)
|
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? 0.60
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: 0.38,
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),
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blurRadius: 8,
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),
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Shadow(
|
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color: Colors.white.withValues(
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alpha: index == _position.round().clamp(0, 2)
|
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? 0.95
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: 0.85,
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),
|
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blurRadius: 2.8,
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),
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Shadow(
|
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color: Colors.white.withValues(
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alpha: index == _position.round().clamp(0, 2)
|
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? 0.34
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: 0.22,
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),
|
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blurRadius: 1.4,
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),
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],
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),
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),
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),
|
|
const SizedBox(height: 2),
|
|
Flexible(
|
|
child: FittedBox(
|
|
fit: BoxFit.scaleDown,
|
|
child: Text(
|
|
caption ?? label,
|
|
maxLines: 1,
|
|
style: TextStyle(
|
|
fontSize: 11,
|
|
height: 1.1,
|
|
fontWeight: FontWeight.w600,
|
|
color: index == _position.round().clamp(0, 2)
|
|
? _blue
|
|
: _blue.withValues(alpha: 0.62),
|
|
),
|
|
),
|
|
),
|
|
),
|
|
],
|
|
),
|
|
),
|
|
),
|
|
),
|
|
);
|
|
}
|
|
|
|
/// Plays once on entry. Remaining over a symbol does not restart its animation.
|
|
class _DockSymbol extends StatefulWidget {
|
|
const _DockSymbol({
|
|
required this.active,
|
|
required this.reduceMotion,
|
|
required this.child,
|
|
});
|
|
final bool active, reduceMotion;
|
|
final Widget child;
|
|
@override
|
|
State<_DockSymbol> createState() => _DockSymbolState();
|
|
}
|
|
|
|
class _DockSymbolState extends State<_DockSymbol>
|
|
with SingleTickerProviderStateMixin {
|
|
late final AnimationController _bounce = AnimationController(
|
|
vsync: this,
|
|
duration: const Duration(milliseconds: 440),
|
|
);
|
|
@override
|
|
void didUpdateWidget(_DockSymbol oldWidget) {
|
|
super.didUpdateWidget(oldWidget);
|
|
if (widget.reduceMotion || !widget.active) {
|
|
_bounce.value = 0;
|
|
} else if (!oldWidget.active) {
|
|
_bounce.forward(from: 0);
|
|
}
|
|
}
|
|
|
|
@override
|
|
void dispose() {
|
|
_bounce.dispose();
|
|
super.dispose();
|
|
}
|
|
|
|
@override
|
|
Widget build(BuildContext context) => AnimatedBuilder(
|
|
animation: _bounce,
|
|
child: widget.child,
|
|
builder: (context, child) {
|
|
final lift = widget.reduceMotion
|
|
? 0.0
|
|
: math.sin(math.pi * _bounce.value);
|
|
return Transform.translate(
|
|
offset: Offset(0, -3.5 * lift),
|
|
child: Transform.scale(scale: 1 + lift * 0.16, child: child),
|
|
);
|
|
},
|
|
);
|
|
}
|
|
|
|
/// A white, rounded bevel catches light around a translucent milky body.
|
|
/// Highlights stay at the edge; the backdrop remains visible beneath the glass.
|
|
class _GlassRimPainter extends CustomPainter {
|
|
const _GlassRimPainter({required this.lens, required this.pressure});
|
|
final bool lens;
|
|
final double pressure;
|
|
@override
|
|
void paint(Canvas canvas, Size size) {
|
|
final edge = lens ? const Color(0xFF7B838F) : const Color(0xFF9CAABD);
|
|
// A quiet grey selection at rest; the glossy lens rim returns on touch.
|
|
final opacity = lens ? 0.25 + pressure * 0.75 : 1.0;
|
|
final bounds = Offset.zero & size;
|
|
final outer = RRect.fromRectAndRadius(
|
|
bounds.deflate(0.7),
|
|
Radius.circular(size.height / 2),
|
|
);
|
|
final inner = RRect.fromRectAndRadius(
|
|
bounds.deflate(2.2),
|
|
Radius.circular(size.height / 2 - 1.5),
|
|
);
|
|
canvas.drawRRect(
|
|
outer,
|
|
Paint()
|
|
..style = PaintingStyle.stroke
|
|
..strokeWidth = lens ? 1.4 : 1.8
|
|
..maskFilter = MaskFilter.blur(BlurStyle.normal, lens ? 0.9 : 0.65)
|
|
..shader = ui.Gradient.linear(
|
|
bounds.topLeft,
|
|
bounds.bottomRight,
|
|
[
|
|
Colors.white.withValues(alpha: (lens ? 0.24 : 0.42) * opacity),
|
|
edge.withValues(alpha: 0.04 * opacity),
|
|
Colors.white.withValues(alpha: (lens ? 0.14 : 0.30) * opacity),
|
|
],
|
|
[0.0, 0.55, 1.0],
|
|
),
|
|
);
|
|
canvas.drawRRect(
|
|
outer,
|
|
Paint()
|
|
..style = PaintingStyle.stroke
|
|
..strokeWidth = lens ? 1.0 : 0.85
|
|
..shader = ui.Gradient.sweep(
|
|
bounds.center,
|
|
[
|
|
Colors.white.withValues(alpha: 0.96 * opacity),
|
|
edge.withValues(alpha: (lens ? 0.30 : 0.15) * opacity),
|
|
Colors.white.withValues(alpha: 0.10 * opacity),
|
|
Colors.white.withValues(alpha: 0.94 * opacity),
|
|
edge.withValues(alpha: 0.12 * opacity),
|
|
Colors.white.withValues(alpha: 0.96 * opacity),
|
|
],
|
|
[0.0, 0.18, 0.38, 0.60, 0.80, 1.0],
|
|
TileMode.clamp,
|
|
-math.pi / 2,
|
|
math.pi * 1.5,
|
|
),
|
|
);
|
|
canvas.drawRRect(
|
|
inner,
|
|
Paint()
|
|
..style = PaintingStyle.stroke
|
|
..strokeWidth = 0.45
|
|
..shader = ui.Gradient.linear(
|
|
bounds.topLeft,
|
|
bounds.bottomRight,
|
|
[
|
|
Colors.white.withValues(alpha: (lens ? 0.20 : 0.34) * opacity),
|
|
edge.withValues(alpha: (lens ? 0.13 : 0.07) * opacity),
|
|
Colors.white.withValues(alpha: (lens ? 0.28 : 0.40) * opacity),
|
|
],
|
|
[0.0, 0.5, 1.0],
|
|
),
|
|
);
|
|
final shine = Path()
|
|
..moveTo(size.height * 0.32, 4)
|
|
..quadraticBezierTo(
|
|
size.width * 0.5,
|
|
1.8,
|
|
size.width - size.height * 0.35,
|
|
4,
|
|
);
|
|
canvas.drawPath(
|
|
shine,
|
|
Paint()
|
|
..style = PaintingStyle.stroke
|
|
..strokeCap = StrokeCap.round
|
|
..strokeWidth = 0.8
|
|
..shader = ui.Gradient.linear(
|
|
Offset.zero,
|
|
Offset(size.width, 0),
|
|
[
|
|
Colors.white.withValues(alpha: 0),
|
|
Colors.white.withValues(alpha: 0.50 * opacity),
|
|
Colors.white.withValues(alpha: 0),
|
|
],
|
|
[0.0, 0.5, 1.0],
|
|
),
|
|
);
|
|
}
|
|
|
|
@override
|
|
bool shouldRepaint(_GlassRimPainter oldDelegate) =>
|
|
oldDelegate.lens != lens || oldDelegate.pressure != pressure;
|
|
}
|