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39 lines
907 B
Dart
39 lines
907 B
Dart
/* ZiK */
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import 'dart:async';
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import 'package:flutter/cupertino.dart';
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typedef ChildProvider<E> = Widget Function(BuildContext context, E? data);
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class Updater<T> extends StatelessWidget{
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final ChildProvider<T> childProvider;
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StreamController<T?>? sink;
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T? initialData;
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List<T?> _history = [];
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Stream<T?>? _stream;
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Updater({T? initialData, required this.childProvider}){
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this.sink = StreamController<T?>();
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this.initialData = initialData;
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_stream = this.sink?.stream;
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}
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@override
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Widget build(BuildContext context) {
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return StreamBuilder<T?>(
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initialData: this.initialData,
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stream: _stream,
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builder: (ctx, snapshot){
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return childProvider(context, snapshot.data);
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});
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}
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pushData(T? data) {
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_history.add(data);
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sink?.sink.add(data);
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}
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List<T?> getDataHistory() => _history;
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T? getLatestData() => _history.last;
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} |