56 lines
1.2 KiB
Dart
56 lines
1.2 KiB
Dart
import 'package:flutter/material.dart';
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class FadeIndexedStack extends StatefulWidget {
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final int index;
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final List<Widget> children;
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final Duration duration;
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const FadeIndexedStack({
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Key? key,
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required this.index,
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required this.children,
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this.duration = const Duration(
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milliseconds: 800,
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),
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}) : super(key: key);
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@override
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_FadeIndexedStackState createState() => _FadeIndexedStackState();
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}
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class _FadeIndexedStackState extends State<FadeIndexedStack> with SingleTickerProviderStateMixin {
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late AnimationController _controller;
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@override
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void didUpdateWidget(FadeIndexedStack oldWidget) {
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if (widget.index != oldWidget.index) {
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_controller.forward(from: 0.0);
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}
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super.didUpdateWidget(oldWidget);
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}
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@override
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void initState() {
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_controller = AnimationController(vsync: this, duration: widget.duration);
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_controller.forward();
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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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_controller.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 FadeTransition(
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opacity: _controller,
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child: IndexedStack(
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index: widget.index,
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children: widget.children,
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),
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);
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}
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}
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