// Copyright 2017 The Chromium 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/material.dart'; import 'package:flutter/rendering.dart'; import 'package:flutter_test/src/binding.dart' show TestWidgetsFlutterBinding; import 'package:flutter_test/flutter_test.dart'; void main() { test('ensure frame is scheduled for markNeedsSemanticsUpdate', () { // Initialize all bindings because owner.flushSemantics() requires a window TestWidgetsFlutterBinding.ensureInitialized(); final TestRenderObject renderObject = TestRenderObject(); int onNeedVisualUpdateCallCount = 0; final PipelineOwner owner = PipelineOwner(onNeedVisualUpdate: () { onNeedVisualUpdateCallCount +=1; }); owner.ensureSemantics(); renderObject.attach(owner); renderObject.layout(const BoxConstraints.tightForFinite()); // semantics are only calculated if layout information is up to date. owner.flushSemantics(); expect(onNeedVisualUpdateCallCount, 1); renderObject.markNeedsSemanticsUpdate(); expect(onNeedVisualUpdateCallCount, 2); }); test('detached RenderObject does not do semantics', () { final TestRenderObject renderObject = TestRenderObject(); expect(renderObject.attached, isFalse); expect(renderObject.describeSemanticsConfigurationCallCount, 0); renderObject.markNeedsSemanticsUpdate(); expect(renderObject.describeSemanticsConfigurationCallCount, 0); }); } class TestRenderObject extends RenderObject { @override void debugAssertDoesMeetConstraints() { } @override Rect get paintBounds => null; @override void performLayout() { } @override void performResize() { } @override Rect get semanticBounds => Rect.fromLTWH(0.0, 0.0, 10.0, 20.0); int describeSemanticsConfigurationCallCount = 0; @override void describeSemanticsConfiguration(SemanticsConfiguration config) { super.describeSemanticsConfiguration(config); config.isSemanticBoundary = true; describeSemanticsConfigurationCallCount++; } }