59 lines
1.3 KiB
Dart
59 lines
1.3 KiB
Dart
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import 'package:flutter/material.dart';
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class Expand extends StatefulWidget {
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final Widget child;
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final bool expand;
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const Expand({super.key, this.expand = true, required this.child});
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@override
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State<Expand> createState() => _ExpandState();
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}
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class _ExpandState extends State<Expand> with SingleTickerProviderStateMixin {
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late AnimationController expandController;
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late Animation<double> animation;
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@override
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void initState() {
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super.initState();
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prepareAnimations();
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_runExpandCheck();
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}
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///Setting up the animation
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void prepareAnimations() {
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expandController = AnimationController(
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vsync: this, duration: const Duration(milliseconds: 500));
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animation = CurvedAnimation(
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parent: expandController,
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curve: Curves.fastOutSlowIn,
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);
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}
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void _runExpandCheck() {
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if (widget.expand) {
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expandController.forward();
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} else {
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expandController.reverse();
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}
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}
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@override
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void didUpdateWidget(Expand oldWidget) {
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super.didUpdateWidget(oldWidget);
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_runExpandCheck();
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}
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@override
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void dispose() {
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expandController.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 SizeTransition(
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axisAlignment: 1.0, sizeFactor: animation, child: widget.child);
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}
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}
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