157 lines
4.5 KiB
Dart
157 lines
4.5 KiB
Dart
library miniplayer;
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import 'dart:async';
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import 'package:flutter/material.dart';
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typedef Widget MiniplayerBuilder(double height, double percentage);
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class Miniplayer extends StatefulWidget {
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final double minHeight;
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final double maxHeight;
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final MiniplayerBuilder builder;
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final Curve curve;
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final double elevation;
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const Miniplayer({
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Key key,
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@required this.minHeight,
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@required this.maxHeight,
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@required this.builder,
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this.curve = Curves.easeInQuart,
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this.elevation = 0,
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}) : super(key: key);
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@override
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_MiniplayerState createState() => _MiniplayerState();
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}
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class _MiniplayerState extends State<Miniplayer> with TickerProviderStateMixin {
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double _height;
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double _prevHeight;
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//Used to set Size after animation is complete
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double _endHeight;
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bool _up;
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StreamController<double> _heightController =
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StreamController<double>.broadcast();
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AnimationController _animationController;
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Animation<double> _sizeAnimation;
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@override
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void initState() {
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_animationController = AnimationController(
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vsync: this,
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duration: Duration(
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milliseconds: 300,
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),
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);
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_animationController.addStatusListener((status) {
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if (status == AnimationStatus.completed) {
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_animationController.reset();
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_heightController.add(_endHeight);
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_height = _endHeight;
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}
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});
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_height = widget.minHeight;
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super.initState();
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}
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@override
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void dispose() {
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_heightController.close();
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_animationController.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return StreamBuilder(
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initialData: widget.minHeight,
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stream: _heightController.stream,
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builder: (context, AsyncSnapshot<double> snapshot) {
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if (snapshot.hasData) {
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var _percentage = ((snapshot.data - widget.minHeight)) /
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(widget.maxHeight - widget.minHeight);
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return Stack(
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alignment: Alignment.bottomCenter,
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children: [
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if (_percentage > 0)
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GestureDetector(
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onTap: () => animateToHeight(widget.minHeight),
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child: Container(
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color: Colors.black.withOpacity(_percentage * 0.5)),
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),
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Align(
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alignment: Alignment.bottomCenter,
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child: SizedBox(
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height: snapshot.data,
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child: GestureDetector(
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child: Material(
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elevation: widget.elevation,
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child: Container(
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constraints: BoxConstraints.expand(),
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child: widget.builder(snapshot.data, _percentage),
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),
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),
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onTap: () {
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bool up = _height != widget.maxHeight;
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animateToHeight(up ? widget.maxHeight : widget.minHeight);
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},
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onPanEnd: (details) async {
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if (_up)
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animateToHeight(widget.maxHeight);
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else
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animateToHeight(widget.minHeight);
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},
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onPanUpdate: (details) {
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_prevHeight = _height;
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var h = _height -=
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details.delta.dy; //details.delta.dy < 0 -> -- = +
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//Make sure height !> maxHeight && !< minHeight
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if (h > widget.maxHeight)
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h = widget.maxHeight;
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else if (h < widget.minHeight) h = widget.minHeight;
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if (_prevHeight == h &&
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(h == widget.minHeight || h == widget.maxHeight))
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return;
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//print('h: ' + h.toString());
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_height = h;
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_up = _prevHeight < _height;
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_heightController.add(h);
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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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} else
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return Container();
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},
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);
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}
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void animateToHeight(final double h) {
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_endHeight = h;
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_sizeAnimation = Tween(
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begin: _height,
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end: h,
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).animate(
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CurvedAnimation(parent: _animationController, curve: widget.curve));
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_sizeAnimation.addListener(() {
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_heightController.add(_sizeAnimation.value);
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});
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_animationController.forward();
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}
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}
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