Kingkor Roy Tirtho
95 lines
2.7 KiB
Dart
95 lines
2.7 KiB
Dart
import 'dart:math';
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import 'package:fl_query/fl_query.dart';
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import 'package:flutter/material.dart';
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final bowl = QueryBowl();
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final successJob = QueryJob<String, void>(
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queryKey: "greetings-example",
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task: (queryKey, _) => Future.delayed(
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const Duration(seconds: 2),
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() =>
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"The work successfully executed. Data: key=($queryKey) value=${Random.secure().nextInt(100)}",
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),
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);
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final canFailJob = QueryJob<String, void>(
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queryKey: "failure-example",
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task: (queryKey, _) => Random().nextBool()
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? Future.error("$queryKey operation failed for unknown reason")
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: Future.value(
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"Successful execution. Result: $queryKey=${Random().nextInt(100)}",
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),
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);
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class BasicQueryExample extends StatelessWidget {
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const BasicQueryExample({Key? key}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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return Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Text(
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"# Basic Query Example",
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style: Theme.of(context).textTheme.headline5,
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),
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QueryBuilder<String, void>(
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job: successJob,
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externalData: null,
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onData: (data) {
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print("Success: $data");
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},
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builder: (context, query) {
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if (!query.hasData || query.isLoading || query.isRefetching) {
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return const CircularProgressIndicator();
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}
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return Row(
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children: [
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Text(query.data!),
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ElevatedButton(
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child: const Text("Refetch"),
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onPressed: () async {
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await query.refetch();
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},
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),
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],
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);
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},
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),
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QueryBuilder<String, void>(
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job: canFailJob,
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externalData: null,
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onError: (error) {
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print("Error: $error");
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},
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builder: (context, query) {
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if (!query.hasData || query.isLoading || query.isRefetching) {
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return const CircularProgressIndicator();
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}
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return Row(
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children: [
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if (query.hasError)
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Text(
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"${query.error}. Retrying: ${query.retryAttempts}",
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),
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if (query.hasData)
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Text(
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"Success after ${query.retryAttempts}\nData: ${query.data}",
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),
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ElevatedButton(
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child: const Text("Refetch"),
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onPressed: () async {
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await query.refetch();
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},
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),
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],
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);
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},
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),
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],
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);
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}
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}
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