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