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6221d5c709
To make them a little more resilient to changes in the tree shape as the tree will be changing a little bit for multi view.
73 lines
2.4 KiB
Dart
73 lines
2.4 KiB
Dart
// Copyright 2014 The Flutter 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 'package:flutter/rendering.dart';
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import 'package:flutter_test/flutter_test.dart';
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import 'rendering_tester.dart';
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void main() {
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TestRenderingFlutterBinding.ensureInitialized();
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test('only send semantics update if semantics have changed', () {
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final TestRender testRender = TestRender()
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..properties = const SemanticsProperties(label: 'hello')
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..textDirection = TextDirection.ltr;
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final RenderConstrainedBox tree = RenderConstrainedBox(
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additionalConstraints: const BoxConstraints.tightFor(height: 20.0, width: 20.0),
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child: testRender,
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);
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int semanticsUpdateCount = 0;
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final SemanticsHandle semanticsHandle = TestRenderingFlutterBinding.instance.pipelineOwner.ensureSemantics(
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listener: () {
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++semanticsUpdateCount;
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},
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);
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layout(tree, phase: EnginePhase.flushSemantics);
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// Initial render does semantics.
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expect(semanticsUpdateCount, 1);
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expect(testRender.describeSemanticsConfigurationCallCount, isPositive);
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testRender.describeSemanticsConfigurationCallCount = 0;
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semanticsUpdateCount = 0;
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// Request semantics update even though nothing changed.
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testRender.markNeedsSemanticsUpdate();
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pumpFrame(phase: EnginePhase.flushSemantics);
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// Object is asked for semantics, but no update is sent.
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expect(semanticsUpdateCount, 0);
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expect(testRender.describeSemanticsConfigurationCallCount, isPositive);
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testRender.describeSemanticsConfigurationCallCount = 0;
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semanticsUpdateCount = 0;
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// Change semantics and request update.
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testRender.properties = const SemanticsProperties(label: 'bye');
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testRender.markNeedsSemanticsUpdate();
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pumpFrame(phase: EnginePhase.flushSemantics);
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// Object is asked for semantics, and update is sent.
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expect(semanticsUpdateCount, 1);
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expect(testRender.describeSemanticsConfigurationCallCount, isPositive);
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semanticsHandle.dispose();
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});
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}
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class TestRender extends RenderSemanticsAnnotations {
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TestRender() : super(properties: const SemanticsProperties());
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int describeSemanticsConfigurationCallCount = 0;
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@override
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void describeSemanticsConfiguration(SemanticsConfiguration config) {
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super.describeSemanticsConfiguration(config);
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describeSemanticsConfigurationCallCount += 1;
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}
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}
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