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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:ui' as ui;
import 'package:flutter/foundation.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter/painting.dart';
void main() {
testWidgets('didHaveMemoryPressure clears imageCache', (WidgetTester tester) async {
imageCache.putIfAbsent(1, () => OneFrameImageStreamCompleter(
Future<ImageInfo>.value(ImageInfo(
image: FakeImage(),
scale: 1.0,
),
)));
await tester.idle();
expect(imageCache.currentSize, 1);
final ByteData message = const JSONMessageCodec().encodeMessage(
<String, dynamic>{'type': 'memoryPressure'});
await ServicesBinding.instance.defaultBinaryMessenger.handlePlatformMessage('flutter/system', message, (_) { });
expect(imageCache.currentSize, 0);
});
test('evict clears live references', () async {
final TestPaintingBinding binding = TestPaintingBinding();
expect(binding.imageCache.clearCount, 0);
expect(binding.imageCache.liveClearCount, 0);
binding.evict('/path/to/asset.png');
expect(binding.imageCache.clearCount, 1);
expect(binding.imageCache.liveClearCount, 1);
});
}
class TestBindingBase implements BindingBase {
@override
void initInstances() {}
@override
void initServiceExtensions() {}
@override
Future<void> lockEvents(Future<void> Function() callback) async {}
@override
bool get locked => throw UnimplementedError();
@override
Future<void> performReassemble() {
throw UnimplementedError();
}
@override
void postEvent(String eventKind, Map<String, dynamic> eventData) {}
@override
Future<void> reassembleApplication() {
throw UnimplementedError();
}
@override
void registerBoolServiceExtension({String name, AsyncValueGetter<bool> getter, AsyncValueSetter<bool> setter}) {}
@override
void registerNumericServiceExtension({String name, AsyncValueGetter<double> getter, AsyncValueSetter<double> setter}) {}
@override
void registerServiceExtension({String name, ServiceExtensionCallback callback}) {}
@override
void registerSignalServiceExtension({String name, AsyncCallback callback}) {}
@override
void registerStringServiceExtension({String name, AsyncValueGetter<String> getter, AsyncValueSetter<String> setter}) {}
@override
void unlocked() {}
@override
ui.Window get window => throw UnimplementedError();
}
class TestPaintingBinding extends TestBindingBase with SchedulerBinding, ServicesBinding, PaintingBinding {
@override
final FakeImageCache imageCache = FakeImageCache();
@override
ImageCache createImageCache() => imageCache;
}
class FakeImageCache extends ImageCache {
int clearCount = 0;
int liveClearCount = 0;
@override
void clear() {
clearCount += 1;
super.clear();
}
@override
void clearLiveImages() {
liveClearCount += 1;
super.clearLiveImages();
}
}
class FakeImage implements ui.Image {
@override
void dispose() {}
@override
int get height => 10;
@override
Future<ByteData> toByteData({ui.ImageByteFormat format = ui.ImageByteFormat.rawRgba}) {
throw UnimplementedError();
}
@override
int get width => 10;
}