| // 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_test/flutter_test.dart'; |
| import 'package:flutter/rendering.dart'; |
| import 'package:flutter/widgets.dart'; |
| |
| import 'test_widgets.dart'; |
| |
| void checkTree(WidgetTester tester, List<BoxDecoration> expectedDecorations) { |
| final MultiChildRenderObjectElement element = tester.element(find.byElementPredicate( |
| (Element element) => element is MultiChildRenderObjectElement |
| )); |
| expect(element, isNotNull); |
| expect(element.renderObject, isA<RenderStack>()); |
| final RenderStack renderObject = element.renderObject as RenderStack; |
| try { |
| RenderObject child = renderObject.firstChild; |
| for (final BoxDecoration decoration in expectedDecorations) { |
| expect(child, isA<RenderDecoratedBox>()); |
| final RenderDecoratedBox decoratedBox = child as RenderDecoratedBox; |
| expect(decoratedBox.decoration, equals(decoration)); |
| final StackParentData decoratedBoxParentData = decoratedBox.parentData as StackParentData; |
| child = decoratedBoxParentData.nextSibling; |
| } |
| expect(child, isNull); |
| } catch (e) { |
| print(renderObject.toStringDeep()); |
| rethrow; |
| } |
| } |
| |
| class MockMultiChildRenderObjectWidget extends MultiChildRenderObjectWidget { |
| MockMultiChildRenderObjectWidget({ Key key, List<Widget> children }) : super(key: key, children: children); |
| |
| @override |
| RenderObject createRenderObject(BuildContext context) => null; |
| } |
| |
| void main() { |
| testWidgets('MultiChildRenderObjectElement control test', (WidgetTester tester) async { |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| DecoratedBox(decoration: kBoxDecorationA), |
| DecoratedBox(decoration: kBoxDecorationB), |
| DecoratedBox(decoration: kBoxDecorationC), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB, kBoxDecorationC]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| DecoratedBox(decoration: kBoxDecorationA), |
| DecoratedBox(decoration: kBoxDecorationC), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationC]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| DecoratedBox(decoration: kBoxDecorationA), |
| DecoratedBox(key: Key('b'), decoration: kBoxDecorationB), |
| DecoratedBox(decoration: kBoxDecorationC), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB, kBoxDecorationC]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| DecoratedBox(key: Key('b'), decoration: kBoxDecorationB), |
| DecoratedBox(decoration: kBoxDecorationC), |
| DecoratedBox(key: Key('a'), decoration: kBoxDecorationA), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationB, kBoxDecorationC, kBoxDecorationA]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| DecoratedBox(key: Key('a'), decoration: kBoxDecorationA), |
| DecoratedBox(decoration: kBoxDecorationC), |
| DecoratedBox(key: Key('b'), decoration: kBoxDecorationB), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationC, kBoxDecorationB]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| DecoratedBox(decoration: kBoxDecorationC), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationC]); |
| |
| await tester.pumpWidget( |
| Stack(textDirection: TextDirection.ltr) |
| ); |
| |
| checkTree(tester, <BoxDecoration>[]); |
| |
| }); |
| |
| testWidgets('MultiChildRenderObjectElement with stateless widgets', (WidgetTester tester) async { |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| DecoratedBox(decoration: kBoxDecorationA), |
| DecoratedBox(decoration: kBoxDecorationB), |
| DecoratedBox(decoration: kBoxDecorationC), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB, kBoxDecorationC]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: <Widget>[ |
| const DecoratedBox(decoration: kBoxDecorationA), |
| Container( |
| child: const DecoratedBox(decoration: kBoxDecorationB), |
| ), |
| const DecoratedBox(decoration: kBoxDecorationC), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB, kBoxDecorationC]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: <Widget>[ |
| const DecoratedBox(decoration: kBoxDecorationA), |
| Container( |
| child: Container( |
| child: const DecoratedBox(decoration: kBoxDecorationB), |
| ), |
| ), |
| const DecoratedBox(decoration: kBoxDecorationC), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB, kBoxDecorationC]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: <Widget>[ |
| Container( |
| child: Container( |
| child: const DecoratedBox(decoration: kBoxDecorationB), |
| ), |
| ), |
| Container( |
| child: const DecoratedBox(decoration: kBoxDecorationA), |
| ), |
| const DecoratedBox(decoration: kBoxDecorationC), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationB, kBoxDecorationA, kBoxDecorationC]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: <Widget>[ |
| Container( |
| child: const DecoratedBox(decoration: kBoxDecorationB), |
| ), |
| Container( |
| child: const DecoratedBox(decoration: kBoxDecorationA), |
| ), |
| const DecoratedBox(decoration: kBoxDecorationC), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationB, kBoxDecorationA, kBoxDecorationC]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: <Widget>[ |
| Container( |
| key: const Key('b'), |
| child: const DecoratedBox(decoration: kBoxDecorationB), |
| ), |
| Container( |
| key: const Key('a'), |
| child: const DecoratedBox(decoration: kBoxDecorationA), |
| ), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationB, kBoxDecorationA]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: <Widget>[ |
| Container( |
| key: const Key('a'), |
| child: const DecoratedBox(decoration: kBoxDecorationA), |
| ), |
| Container( |
| key: const Key('b'), |
| child: const DecoratedBox(decoration: kBoxDecorationB), |
| ), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB]); |
| |
| await tester.pumpWidget( |
| Stack(textDirection: TextDirection.ltr) |
| ); |
| |
| checkTree(tester, <BoxDecoration>[]); |
| }); |
| |
| testWidgets('MultiChildRenderObjectElement with stateful widgets', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| DecoratedBox(decoration: kBoxDecorationA), |
| DecoratedBox(decoration: kBoxDecorationB), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationB]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| FlipWidget( |
| left: DecoratedBox(decoration: kBoxDecorationA), |
| right: DecoratedBox(decoration: kBoxDecorationB), |
| ), |
| DecoratedBox(decoration: kBoxDecorationC), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationA, kBoxDecorationC]); |
| |
| flipStatefulWidget(tester); |
| await tester.pump(); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationB, kBoxDecorationC]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| FlipWidget( |
| left: DecoratedBox(decoration: kBoxDecorationA), |
| right: DecoratedBox(decoration: kBoxDecorationB), |
| ), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationB]); |
| |
| flipStatefulWidget(tester); |
| await tester.pump(); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationA]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| FlipWidget( |
| key: Key('flip'), |
| left: DecoratedBox(decoration: kBoxDecorationA), |
| right: DecoratedBox(decoration: kBoxDecorationB), |
| ), |
| ], |
| ), |
| ); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| DecoratedBox(key: Key('c'), decoration: kBoxDecorationC), |
| FlipWidget( |
| key: Key('flip'), |
| left: DecoratedBox(decoration: kBoxDecorationA), |
| right: DecoratedBox(decoration: kBoxDecorationB), |
| ), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationC, kBoxDecorationA]); |
| |
| flipStatefulWidget(tester); |
| await tester.pump(); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationC, kBoxDecorationB]); |
| |
| await tester.pumpWidget( |
| Stack( |
| textDirection: TextDirection.ltr, |
| children: const <Widget>[ |
| FlipWidget( |
| key: Key('flip'), |
| left: DecoratedBox(decoration: kBoxDecorationA), |
| right: DecoratedBox(decoration: kBoxDecorationB), |
| ), |
| DecoratedBox(key: Key('c'), decoration: kBoxDecorationC), |
| ], |
| ), |
| ); |
| |
| checkTree(tester, <BoxDecoration>[kBoxDecorationB, kBoxDecorationC]); |
| }); |
| |
| // Regression test for https://github.com/flutter/flutter/issues/37136. |
| test('provides useful assertion message when one of the children is null', () { |
| bool assertionTriggered = false; |
| try { |
| MockMultiChildRenderObjectWidget(children: const <Widget>[null]); |
| } catch (e) { |
| expect(e.toString(), contains("MockMultiChildRenderObjectWidget's children must not contain any null values,")); |
| assertionTriggered = true; |
| } |
| |
| expect(assertionTriggered, isTrue); |
| }); |
| } |