stack_wallet/lib/widgets/expandable.dart

110 lines
2.8 KiB
Dart

import 'package:flutter/material.dart';
enum ExpandableState {
expanded,
collapsed,
}
class ExpandableController {
VoidCallback? toggle;
ExpandableState state = ExpandableState.collapsed;
}
class Expandable extends StatefulWidget {
const Expandable({
Key? key,
required this.header,
required this.body,
this.animationController,
this.animation,
this.animationDurationMultiplier = 1.0,
this.onExpandChanged,
this.controller,
}) : super(key: key);
final Widget header;
final Widget body;
final AnimationController? animationController;
final Animation<double>? animation;
final double animationDurationMultiplier;
final void Function(ExpandableState)? onExpandChanged;
final ExpandableController? controller;
@override
State<Expandable> createState() => _ExpandableState();
}
class _ExpandableState extends State<Expandable> with TickerProviderStateMixin {
late final AnimationController animationController;
late final Animation<double> animation;
late final Duration duration;
late final ExpandableController? controller;
ExpandableState _toggleState = ExpandableState.collapsed;
Future<void> toggle() async {
if (animation.isDismissed) {
await animationController.forward();
_toggleState = ExpandableState.collapsed;
widget.onExpandChanged?.call(_toggleState);
} else if (animation.isCompleted) {
await animationController.reverse();
_toggleState = ExpandableState.expanded;
widget.onExpandChanged?.call(_toggleState);
}
controller?.state = _toggleState;
}
@override
void initState() {
controller = widget.controller;
controller?.toggle = toggle;
duration = Duration(
milliseconds: (500 * widget.animationDurationMultiplier).toInt(),
);
animationController = widget.animationController ??
AnimationController(
vsync: this,
duration: duration,
);
animation = widget.animation ??
Tween<double>(begin: 0.0, end: 1.0).animate(
CurvedAnimation(
curve: Curves.easeInOut,
parent: animationController,
),
);
super.initState();
}
@override
void dispose() {
animationController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Column(
mainAxisSize: MainAxisSize.min,
children: [
MouseRegion(
cursor: SystemMouseCursors.click,
child: GestureDetector(
onTap: toggle,
child: Container(
color: Colors.transparent,
child: widget.header,
),
),
),
SizeTransition(
sizeFactor: animation,
axisAlignment: 1.0,
child: widget.body,
),
],
);
}
}