91 lines
2.6 KiB
Dart
91 lines
2.6 KiB
Dart
import 'package:flutter/material.dart';
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typedef DataDidChangeCallback<T> = bool Function(T o, T n);
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///Fades out the old data and back in with the new
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class AnimatedFadeOutIn<T> extends StatefulWidget {
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///If [initialData] is not null on first build it will be shown.
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///Directly after that the animation changes the value to [data].
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final T? initialData;
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///The data to show
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final T data;
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final Duration duration;
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final Widget Function(T data) builder;
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final VoidCallback? onFadeComplete;
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/// Compare the values to determine if the data has changed.
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/// If [null] the data is compared using `!=` expression
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final DataDidChangeCallback<T>? dataDidChange;
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const AnimatedFadeOutIn({
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Key? key,
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this.initialData,
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required this.data,
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required this.builder,
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this.duration = const Duration(milliseconds: 300),
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this.onFadeComplete,
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this.dataDidChange,
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}) : super(key: key);
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@override
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AnimatedFadeOutInState<T> createState() => AnimatedFadeOutInState<T>();
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}
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class AnimatedFadeOutInState<T> extends State<AnimatedFadeOutIn<T>>
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with SingleTickerProviderStateMixin {
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late AnimationController controller;
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late Animation<double> animation;
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late T dataToShow;
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@override
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void initState() {
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super.initState();
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dataToShow = widget.initialData ?? widget.data;
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controller = AnimationController(vsync: this, duration: widget.duration)
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..addListener(() => setState(() {}))
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..addStatusListener((status) {
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if (status == AnimationStatus.completed) {
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dataToShow = widget.data;
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controller.reverse(from: 1.0);
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} else if (status == AnimationStatus.dismissed) {
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widget.onFadeComplete?.call();
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}
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});
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animation = Tween<double>(begin: 0.0, end: 1.0).animate(
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CurvedAnimation(
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parent: controller,
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curve: Curves.easeIn,
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reverseCurve: Curves.easeOut,
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),
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);
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if (widget.dataDidChange?.call(dataToShow, widget.data) ??
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widget.data != dataToShow) {
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controller.forward(from: 0.0);
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}
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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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void didUpdateWidget(AnimatedFadeOutIn<T> oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (widget.dataDidChange?.call(oldWidget.data, widget.data) ??
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widget.data != oldWidget.data) {
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dataToShow = oldWidget.data;
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controller.forward(from: 0.0);
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}
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}
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@override
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Widget build(BuildContext context) => Opacity(
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opacity: 1.0 - animation.value,
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child: widget.builder(dataToShow),
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);
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}
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