172 lines
4.9 KiB
Dart
172 lines
4.9 KiB
Dart
library miniplayer;
|
|
|
|
import 'dart:async';
|
|
|
|
import 'package:flutter/material.dart';
|
|
|
|
typedef Widget MiniplayerBuilder(double height, double percentage);
|
|
|
|
class Miniplayer extends StatefulWidget {
|
|
final double minHeight;
|
|
final double maxHeight;
|
|
final MiniplayerBuilder builder;
|
|
final Curve curve;
|
|
final double elevation;
|
|
final Color backgroundColor;
|
|
final ValueNotifier<double> valueNotifier;
|
|
|
|
const Miniplayer({
|
|
Key key,
|
|
@required this.minHeight,
|
|
@required this.maxHeight,
|
|
@required this.builder,
|
|
this.curve = Curves.easeInQuart,
|
|
this.elevation = 0,
|
|
this.backgroundColor = const Color(0x70000000),
|
|
this.valueNotifier,
|
|
}) : super(key: key);
|
|
|
|
@override
|
|
_MiniplayerState createState() => _MiniplayerState();
|
|
}
|
|
|
|
class _MiniplayerState extends State<Miniplayer> with TickerProviderStateMixin {
|
|
ValueNotifier<double> heightNotifier;
|
|
|
|
double _height;
|
|
double _prevHeight;
|
|
|
|
//Used to set the height after the animation is complete
|
|
double _endHeight;
|
|
bool _up;
|
|
|
|
StreamController<double> _heightController =
|
|
StreamController<double>.broadcast();
|
|
AnimationController _animationController;
|
|
Animation<double> _sizeAnimation;
|
|
|
|
@override
|
|
void initState() {
|
|
if (widget.valueNotifier == null)
|
|
heightNotifier = ValueNotifier(widget.minHeight);
|
|
else
|
|
heightNotifier = widget.valueNotifier;
|
|
|
|
_animationController = AnimationController(
|
|
vsync: this,
|
|
duration: Duration(
|
|
milliseconds: 300,
|
|
),
|
|
);
|
|
|
|
_animationController.addStatusListener((status) {
|
|
if (status == AnimationStatus.completed) {
|
|
_animationController.reset();
|
|
heightNotifier.value = _endHeight;
|
|
_height = _endHeight;
|
|
}
|
|
});
|
|
|
|
_height = widget.minHeight;
|
|
super.initState();
|
|
}
|
|
|
|
@override
|
|
void dispose() {
|
|
_heightController.close();
|
|
_animationController.dispose();
|
|
super.dispose();
|
|
}
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
return ValueListenableBuilder(
|
|
builder: (BuildContext context, double value, Widget child) {
|
|
var _percentage = ((value - widget.minHeight)) /
|
|
(widget.maxHeight - widget.minHeight);
|
|
|
|
return Stack(
|
|
alignment: Alignment.bottomCenter,
|
|
children: [
|
|
if (_percentage > 0)
|
|
GestureDetector(
|
|
onTap: () => _animateToHeight(widget.minHeight),
|
|
child: Opacity(
|
|
opacity: _percentage,
|
|
child: Container(color: widget.backgroundColor),
|
|
),
|
|
),
|
|
Align(
|
|
alignment: Alignment.bottomCenter,
|
|
child: SizedBox(
|
|
height: value,
|
|
child: GestureDetector(
|
|
child: Material(
|
|
elevation: widget.elevation,
|
|
child: Container(
|
|
constraints: BoxConstraints.expand(),
|
|
child: widget.builder(value, _percentage),
|
|
),
|
|
),
|
|
onTap: () {
|
|
bool up = _height != widget.maxHeight;
|
|
_animateToHeight(up ? widget.maxHeight : widget.minHeight);
|
|
},
|
|
onPanEnd: (details) async {
|
|
if (_up)
|
|
_animateToHeight(widget.maxHeight);
|
|
else
|
|
_animateToHeight(widget.minHeight);
|
|
},
|
|
onPanUpdate: (details) {
|
|
_prevHeight = _height;
|
|
|
|
//details.delta.dy < 0 -> -- = +
|
|
var h = _height -= details.delta.dy;
|
|
|
|
//Makes sure that height !> maxHeight && !< minHeight
|
|
if (h > widget.maxHeight) h = widget.maxHeight;
|
|
if (h < widget.minHeight) h = widget.minHeight;
|
|
|
|
//Makes sure that the widget wont rebuild unnecessarily
|
|
if (_prevHeight == h &&
|
|
(h == widget.minHeight || h == widget.maxHeight))
|
|
return;
|
|
|
|
_height = h;
|
|
if (_height == widget.maxHeight)
|
|
_up = true;
|
|
else if (_height == widget.minHeight)
|
|
_up = false;
|
|
else
|
|
_up = _prevHeight < _height;
|
|
|
|
heightNotifier.value = h;
|
|
},
|
|
),
|
|
),
|
|
),
|
|
],
|
|
);
|
|
},
|
|
valueListenable: heightNotifier,
|
|
);
|
|
}
|
|
|
|
void _animateToHeight(final double h) {
|
|
_endHeight = h;
|
|
_sizeAnimation = Tween(
|
|
begin: _height,
|
|
end: h,
|
|
).animate(
|
|
CurvedAnimation(parent: _animationController, curve: widget.curve));
|
|
|
|
_sizeAnimation.addListener(() {
|
|
if (!(_sizeAnimation.value > widget.maxHeight) &&
|
|
!(_sizeAnimation.value < widget.minHeight))
|
|
heightNotifier.value = _sizeAnimation.value;
|
|
});
|
|
_animationController.forward();
|
|
}
|
|
}
|