96 lines
2.8 KiB
Dart
96 lines
2.8 KiB
Dart
import 'package:fl_query/models/query_job.dart';
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import 'package:fl_query/query.dart';
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import 'package:fl_query/query_bowl.dart';
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import 'package:fl_query/utils.dart';
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import 'package:flutter/widgets.dart';
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class QueryBuilder<T extends Object, Outside> extends StatefulWidget {
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final Function(BuildContext, Query<T, Outside>) builder;
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final QueryJob<T, Outside> job;
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final Outside externalData;
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/// Called when the query returns new data, on query
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/// refetch or query gets expired
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final QueryListener<T>? onData;
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/// Called when the query returns error
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final QueryListener<dynamic>? onError;
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const QueryBuilder({
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required this.job,
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required this.externalData,
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required this.builder,
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this.onData,
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this.onError,
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Key? key,
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}) : super(key: key);
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@override
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State<QueryBuilder<T, Outside>> createState() =>
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_QueryBuilderState<T, Outside>();
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}
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class _QueryBuilderState<T extends Object, Outside>
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extends State<QueryBuilder<T, Outside>> {
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late QueryBowl queryBowl;
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late final ValueKey<String> uKey;
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late Query<T, Outside> query;
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@override
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void initState() {
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super.initState();
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uKey = ValueKey<String>(uuid.v4());
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query = Query<T, Outside>.fromOptions(
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widget.job,
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externalData: widget.externalData,
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);
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WidgetsBinding.instance.addPostFrameCallback((_) async {
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query = QueryBowl.of(context).addQuery<T, Outside>(
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query,
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key: uKey,
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onData: widget.onData,
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onError: widget.onError,
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);
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await query.fetch();
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});
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}
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@override
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void didUpdateWidget(covariant oldWidget) {
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if (oldWidget.externalData != widget.externalData) {
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QueryBowl.of(context).fetchQuery(
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widget.job,
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externalData: widget.externalData,
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onData: widget.onData,
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onError: widget.onError,
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key: uKey,
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);
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} else {
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if (oldWidget.onData != widget.onData && oldWidget.onData != null) {
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query.onDataListeners.remove(oldWidget.onData);
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if (widget.onData != null) query.onDataListeners.add(widget.onData!);
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}
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if (oldWidget.onError != widget.onError && oldWidget.onError != null) {
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query.onErrorListeners.remove(oldWidget.onError);
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if (widget.onError != null) query.onErrorListeners.add(widget.onError!);
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}
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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 dispose() {
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query.unmount(uKey);
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if (widget.onData != null) query.onDataListeners.remove(widget.onData);
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if (widget.onError != null) query.onErrorListeners.remove(widget.onError);
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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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queryBowl = QueryBowl.of(context);
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final latestQuery = queryBowl.getQuery<T, Outside>(query.queryKey) ?? query;
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return widget.builder(context, latestQuery);
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}
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}
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