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Code Issues Releases Wiki Activity

new file: lib/home/audiopanel.dart

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stonegate 2020-02-14 14:32:21 +08:00
parent 4957770e0c
commit 28595bc8da
1 changed files with 135 additions and 0 deletions
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lib/home/audiopanel.dart Normal file
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import 'package:flutter/material.dart';
class AudioPanel extends StatefulWidget {
final Widget miniPanel;
final Widget expandedPanel;
AudioPanel({this.miniPanel, this.expandedPanel, Key key}) : super(key: key);
@override
_AudioPanelState createState() => _AudioPanelState();
}
class _AudioPanelState extends State<AudioPanel>
with SingleTickerProviderStateMixin {
double initSize;
double minSize = 60;
double maxSize = 300;
double _startdy;
double _move = 0;
AnimationController _controller;
var _animation;
@override
void initState() {
super.initState();
initSize = minSize;
_controller =
AnimationController(vsync: this, duration: Duration(milliseconds: 100))
..addListener(() {
setState(() {});
});
_animation =
Tween<double>(begin: initSize, end: initSize).animate(_controller);
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return GestureDetector(
onVerticalDragStart: (event) => _start(event),
onVerticalDragUpdate: (event) => _update(event),
onVerticalDragEnd: (event) => _end(),
child: Container(
height: (_animation.value >= maxSize)
? maxSize
: (_animation.value <= minSize) ? minSize : _animation.value,
child: _animation.value < minSize + 30
? Opacity(
opacity: _animation.value > minSize
? (minSize + 30 - _animation.value) / 40
: 1,
child: Container(
child: widget.miniPanel,
),
)
: Container(
decoration: BoxDecoration(
color: Colors.grey[100],
boxShadow: [
BoxShadow(
color: Colors.grey[400].withOpacity(0.8),
spreadRadius: 3,
blurRadius: 6,
offset: Offset(0, -1),
)
],
),
child: SingleChildScrollView(
child: Opacity(
opacity: _animation.value < (maxSize - 50)
? (_animation.value - minSize) /
(maxSize - minSize - 50)
: 1,
child: Container(
height: maxSize,
child: widget.expandedPanel,
),
),
),
),
),
);
}
_start(DragStartDetails event) {
print(event.localPosition.dy);
setState(() {
_startdy = event.localPosition.dy;
});
_controller.forward();
}
_update(DragUpdateDetails event) {
print(event.localPosition.dy);
setState(() {
_move = _startdy - event.localPosition.dy;
_animation = Tween<double>(begin: initSize, end: initSize + _move)
.animate(_controller);
});
_controller.forward();
}
_end() {
print(_animation.value);
if (_animation.value >= (maxSize + minSize) / 2.2 &&
_animation.value < maxSize) {
setState(() {
_animation = Tween<double>(begin: _animation.value, end: maxSize)
.animate(_controller);
initSize = maxSize;
});
_controller.forward();
} else if (_animation.value < (maxSize + minSize) / 2.2 &&
_animation.value > minSize) {
setState(() {
_animation = Tween<double>(begin: _animation.value, end: minSize)
.animate(_controller);
initSize = minSize;
});
_controller.forward();
} else if (_animation.value >= maxSize) {
setState(() {
initSize = maxSize;
});
} else if (_animation.value <= minSize) {
setState(() {
initSize = minSize;
});
}
}
}