130 lines
4.0 KiB
Dart
130 lines
4.0 KiB
Dart
import 'package:fl_query/src/models/query_job.dart';
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import 'package:fl_query/src/query.dart';
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import 'package:fl_query/src/query_bowl.dart';
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import 'package:fl_query/src/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 context, Query<T, Outside> query) 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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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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WidgetsBinding.instance.addPostFrameCallback((_) => init());
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}
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void init([QueryBowl? bowl]) async {
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bowl ??= QueryBowl.of(context);
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query = bowl.addQuery<T, Outside>(
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widget.job,
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externalData: widget.externalData,
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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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final hasExternalDataChanged = query!.externalData != null &&
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query!.prevUsedExternalData != null &&
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!isShallowEqual(query!.externalData!, query!.prevUsedExternalData!);
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if (query!.fetched && hasExternalDataChanged) {
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await query!.refetch();
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} else if (!query!.fetched) {
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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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final hasOnErrorChanged =
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oldWidget.onError != widget.onError && oldWidget.onError != null;
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final hasOnDataChanged =
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oldWidget.onData != widget.onData && oldWidget.onData != null;
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// re-init the query-builder when new queryJob is appended
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if (oldWidget.job.queryKey != widget.job.queryKey) {
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_queryDispose();
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init();
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} else if (oldWidget.externalData != null &&
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widget.externalData != null &&
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!isShallowEqual(oldWidget.externalData!, widget.externalData!)) {
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if (widget.job.refetchOnExternalDataChange ??
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queryBowl.refetchOnExternalDataChange) {
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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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QueryBowl.of(context)
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.getQuery(widget.job.queryKey)
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?.setExternalData(widget.externalData);
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}
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if (hasOnDataChanged) query?.onDataListeners.remove(oldWidget.onData);
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if (hasOnErrorChanged) query?.onErrorListeners.remove(oldWidget.onError);
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} else {
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if (hasOnDataChanged) {
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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 (hasOnErrorChanged) {
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query?.onErrorListeners.remove(oldWidget.onError);
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if (widget.onError != null)
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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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_queryDispose() {
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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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}
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@override
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void dispose() {
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_queryDispose();
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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 =
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queryBowl.getQuery<T, Outside>(widget.job.queryKey) ?? query;
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if (latestQuery == null) return Container();
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return widget.builder(context, latestQuery);
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}
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}
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