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592f81e7c4
The current API was broken in that you registered multiple callbacks at once, but when you removed listeners, only the primary listener was used to determine what was removed. This led to unintuitive cases where the caller could get unexpected behavior. This updates the API to add and remove listeners using a newly introduced [ImageStreamListener] object, a value object that has references to the individual callbacks that may fire. flutter/flutter#24722 flutter/flutter#32374 flutter/flutter#32935
78 lines
2.4 KiB
Dart
78 lines
2.4 KiB
Dart
// Copyright 2019 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:async';
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import 'dart:io';
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import 'package:flutter/material.dart';
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import 'package:mockito/mockito.dart';
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void main() {
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final ThrowingHttpClient httpClient = ThrowingHttpClient();
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final HttpOverrides overrides = ProvidedHttpOverrides(httpClient);
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HttpOverrides.global = overrides;
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final ZoneSpecification specification = ZoneSpecification(
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handleUncaughtError:(Zone zone, ZoneDelegate delegate, Zone parent, Object error, StackTrace stackTrace) {
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FlutterError.reportError(FlutterErrorDetails(
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exception: error,
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context: ErrorDescription('In the Zone handleUncaughtError handler'),
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silent: false,
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));
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});
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when(httpClient.getUrl(any)).thenAnswer((Invocation invocation) {
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final Completer<HttpClientRequest> completer = Completer<HttpClientRequest>.sync();
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completer.completeError(Error());
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return completer.future;
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});
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Zone.current.fork(specification: specification).run<void>(() {
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runApp(ImageLoader());
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});
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}
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class ImageLoader extends StatefulWidget {
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@override
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_ImageLoaderState createState() => _ImageLoaderState();
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}
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class _ImageLoaderState extends State<ImageLoader> {
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bool caughtError = false;
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@override
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void initState() {
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// This is not an image, but we don't care since we're using a faked
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// http client.
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final NetworkImage image = NetworkImage('https://github.com/flutter/flutter');
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final ImageStream stream = image.resolve(ImageConfiguration.empty);
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ImageStreamListener listener;
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listener = ImageStreamListener(
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(ImageInfo info, bool syncCall) {
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stream.removeListener(listener);
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},
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onError: (dynamic error, StackTrace stackTrace) {
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print('ERROR caught by framework');
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stream.removeListener(listener);
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},
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);
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stream.addListener(listener);
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super.initState();
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}
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@override
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Widget build(BuildContext context) {
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return const Text('hello', textDirection: TextDirection.ltr);
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}
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}
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class ThrowingHttpClient extends Mock implements HttpClient {}
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class ProvidedHttpOverrides extends HttpOverrides {
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ProvidedHttpOverrides(this.httpClient);
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final ThrowingHttpClient httpClient;
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@override
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HttpClient createHttpClient(SecurityContext context) {
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return httpClient;
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}
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}
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