// 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/material.dart'; import 'package:flutter/rendering.dart'; import 'package:flutter/widgets.dart'; import 'package:flutter_test/flutter_test.dart'; import 'semantics_tester.dart'; void main() { group('BlockSemantics', () { testWidgets('hides semantic nodes of siblings', (WidgetTester tester) async { final SemanticsTester semantics = SemanticsTester(tester); await tester.pumpWidget(Stack( textDirection: TextDirection.ltr, children: <Widget>[ Semantics( label: 'layer#1', textDirection: TextDirection.ltr, child: Container(), ), const BlockSemantics(), Semantics( label: 'layer#2', textDirection: TextDirection.ltr, child: Container(), ), ], )); expect(semantics, isNot(includesNodeWith(label: 'layer#1'))); await tester.pumpWidget(Stack( textDirection: TextDirection.ltr, children: <Widget>[ Semantics( label: 'layer#1', textDirection: TextDirection.ltr, child: Container(), ), ], )); expect(semantics, includesNodeWith(label: 'layer#1')); semantics.dispose(); }); testWidgets('does not hides semantic nodes of siblings outside the current semantic boundary', (WidgetTester tester) async { final SemanticsTester semantics = SemanticsTester(tester); await tester.pumpWidget(Directionality(textDirection: TextDirection.ltr, child: Stack( children: <Widget>[ Semantics( label: '#1', child: Container(), ), Semantics( label: '#2', container: true, explicitChildNodes: true, child: Stack( children: <Widget>[ Semantics( label: 'NOT#2.1', child: Container(), ), Semantics( label: '#2.2', child: BlockSemantics( child: Semantics( container: true, label: '#2.2.1', child: Container(), ), ), ), Semantics( label: '#2.3', child: Container(), ), ], ), ), Semantics( label: '#3', child: Container(), ), ], ))); expect(semantics, includesNodeWith(label: '#1')); expect(semantics, includesNodeWith(label: '#2')); expect(semantics, isNot(includesNodeWith(label:'NOT#2.1'))); expect(semantics, includesNodeWith(label: '#2.2')); expect(semantics, includesNodeWith(label: '#2.2.1')); expect(semantics, includesNodeWith(label: '#2.3')); expect(semantics, includesNodeWith(label: '#3')); semantics.dispose(); }); testWidgets('node is semantic boundary and blocking previously painted nodes', (WidgetTester tester) async { final SemanticsTester semantics = SemanticsTester(tester); final GlobalKey stackKey = GlobalKey(); await tester.pumpWidget(Directionality(textDirection: TextDirection.ltr, child: Stack( key: stackKey, children: <Widget>[ Semantics( label: 'NOT#1', child: Container(), ), BoundaryBlockSemantics( child: Semantics( label: '#2.1', child: Container(), ), ), Semantics( label: '#3', child: Container(), ), ], ))); expect(semantics, isNot(includesNodeWith(label: 'NOT#1'))); expect(semantics, includesNodeWith(label: '#2.1')); expect(semantics, includesNodeWith(label: '#3')); semantics.dispose(); }); }); } class BoundaryBlockSemantics extends SingleChildRenderObjectWidget { const BoundaryBlockSemantics({ super.key, required Widget super.child }); @override RenderBoundaryBlockSemantics createRenderObject(BuildContext context) => RenderBoundaryBlockSemantics(); } class RenderBoundaryBlockSemantics extends RenderProxyBox { RenderBoundaryBlockSemantics(); @override void describeSemanticsConfiguration(SemanticsConfiguration config) { super.describeSemanticsConfiguration(config); config ..isBlockingSemanticsOfPreviouslyPaintedNodes = true ..isSemanticBoundary = true; } }