blob: fcfbb3771a4934f3152de9c65fc79566e97ab5b5 [file] [log] [blame]
// 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 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
import 'rendering_tester.dart';
void main() {
TestRenderingFlutterBinding.ensureInitialized();
test('only send semantics update if semantics have changed', () {
final TestRender testRender = TestRender()
..properties = const SemanticsProperties(label: 'hello')
..textDirection = TextDirection.ltr;
final RenderConstrainedBox tree = RenderConstrainedBox(
additionalConstraints: const BoxConstraints.tightFor(height: 20.0, width: 20.0),
child: testRender,
);
int semanticsUpdateCount = 0;
final SemanticsHandle semanticsHandle = TestRenderingFlutterBinding.instance.pipelineOwner.ensureSemantics(
listener: () {
++semanticsUpdateCount;
},
);
layout(tree, phase: EnginePhase.flushSemantics);
// Initial render does semantics.
expect(semanticsUpdateCount, 1);
expect(testRender.describeSemanticsConfigurationCallCount, isPositive);
testRender.describeSemanticsConfigurationCallCount = 0;
semanticsUpdateCount = 0;
// Request semantics update even though nothing changed.
testRender.markNeedsSemanticsUpdate();
pumpFrame(phase: EnginePhase.flushSemantics);
// Object is asked for semantics, but no update is sent.
expect(semanticsUpdateCount, 0);
expect(testRender.describeSemanticsConfigurationCallCount, isPositive);
testRender.describeSemanticsConfigurationCallCount = 0;
semanticsUpdateCount = 0;
// Change semantics and request update.
testRender.properties = const SemanticsProperties(label: 'bye');
testRender.markNeedsSemanticsUpdate();
pumpFrame(phase: EnginePhase.flushSemantics);
// Object is asked for semantics, and update is sent.
expect(semanticsUpdateCount, 1);
expect(testRender.describeSemanticsConfigurationCallCount, isPositive);
semanticsHandle.dispose();
});
}
class TestRender extends RenderSemanticsAnnotations {
TestRender() : super(properties: const SemanticsProperties());
int describeSemanticsConfigurationCallCount = 0;
@override
void describeSemanticsConfiguration(SemanticsConfiguration config) {
super.describeSemanticsConfiguration(config);
describeSemanticsConfigurationCallCount += 1;
}
}