tsacdop-podcast-app-android/lib/widgets/settings_sheet.dart

126 lines
3.5 KiB
Dart

import 'dart:math' as math;
import 'package:flutter/material.dart';
import '../util/extension_helper.dart';
class SettingsSheet extends StatefulWidget {
SettingsSheet({this.height, Key key}) : super(key: key);
final double height;
@override
_SettingsSheetState createState() => _SettingsSheetState();
}
class _SettingsSheetState extends State<SettingsSheet>
with TickerProviderStateMixin {
Animation _animation;
AnimationController _controller;
AnimationController _slowController;
double _initSize;
double _startdy;
double _move = 0;
@override
void initState() {
_initSize = widget.height;
_controller =
AnimationController(vsync: this, duration: Duration(milliseconds: 50))
..addListener(() {
if (mounted) setState(() {});
});
_slowController =
AnimationController(vsync: this, duration: Duration(milliseconds: 200))
..addListener(() {
if (mounted) setState(() {});
});
_animation =
Tween<double>(begin: 0, end: _initSize).animate(_slowController);
_slowController.forward();
super.initState();
}
@override
void dispose() {
_slowController.dispose();
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.transparent,
body: Container(
height: context.height,
child: Stack(alignment: Alignment.bottomCenter, children: [
Positioned.fill(
child: GestureDetector(
onTap: () {
_backToMini();
Navigator.pop(context);
},
child: Container(
color: context.scaffoldBackgroundColor.withOpacity(
0.8 * math.min(_animation.value / widget.height, 1.0)),
),
),
),
GestureDetector(
onVerticalDragStart: _start,
onVerticalDragUpdate: _update,
onVerticalDragEnd: (event) => _end(),
child: Container(
height: math.min(_animation.value, widget.height),
color: Colors.white,
),
)
]),
),
);
}
_backToMini() {
setState(() {
_animation =
Tween<double>(begin: _initSize, end: 0).animate(_slowController);
_initSize = 0;
});
_slowController.forward();
}
_start(DragStartDetails event) {
setState(() {
_startdy = event.localPosition.dy;
_animation =
Tween<double>(begin: _initSize, end: _initSize).animate(_controller);
});
_controller.forward();
}
_update(DragUpdateDetails event) {
setState(() {
_move = _startdy - event.localPosition.dy;
_animation = Tween<double>(begin: _initSize, end: _initSize + _move)
.animate(_controller);
});
_controller.forward();
}
_end() async {
if (_move < -50) {
setState(() {
_animation =
Tween<double>(begin: _animation.value, end: 0).animate(_controller);
_initSize = 0;
});
_controller.forward();
Navigator.pop(context);
} else {
setState(() {
_animation = Tween<double>(begin: _animation.value, end: widget.height)
.animate(_controller);
_initSize = widget.height;
});
_controller.forward();
}
}
}