parent_data_test.dart 8.43 KB
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// Copyright 2015 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.

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import 'package:flutter_test/flutter_test.dart';
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import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
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import 'test_widgets.dart';

class TestParentData {
  TestParentData({ this.top, this.right, this.bottom, this.left });

  final double top;
  final double right;
  final double bottom;
  final double left;
}

void checkTree(WidgetTester tester, List<TestParentData> expectedParentData) {
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  MultiChildRenderObjectElement element = tester.element(
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    find.byElementPredicate((Element element) => element is MultiChildRenderObjectElement)
  );
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  expect(element, isNotNull);
  expect(element.renderObject is RenderStack, isTrue);
  RenderStack renderObject = element.renderObject;
  try {
    RenderObject child = renderObject.firstChild;
    for (TestParentData expected in expectedParentData) {
      expect(child is RenderDecoratedBox, isTrue);
      RenderDecoratedBox decoratedBox = child;
      expect(decoratedBox.parentData is StackParentData, isTrue);
      StackParentData parentData = decoratedBox.parentData;
      expect(parentData.top, equals(expected.top));
      expect(parentData.right, equals(expected.right));
      expect(parentData.bottom, equals(expected.bottom));
      expect(parentData.left, equals(expected.left));
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      StackParentData decoratedBoxParentData = decoratedBox.parentData;
      child = decoratedBoxParentData.nextSibling;
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    }
    expect(child, isNull);
  } catch (e) {
    print(renderObject.toStringDeep());
    rethrow;
  }
}

final TestParentData kNonPositioned = new TestParentData();

void main() {
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  testWidgets('ParentDataWidget control test', (WidgetTester tester) async {
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    await tester.pumpWidget(
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      new Stack(
        children: <Widget>[
          new DecoratedBox(decoration: kBoxDecorationA),
          new Positioned(
            top: 10.0,
            left: 10.0,
            child: new DecoratedBox(decoration: kBoxDecorationB)
          ),
          new DecoratedBox(decoration: kBoxDecorationC),
        ]
      )
    );

    checkTree(tester, <TestParentData>[
      kNonPositioned,
      new TestParentData(top: 10.0, left: 10.0),
      kNonPositioned,
    ]);

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    await tester.pumpWidget(
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      new Stack(
        children: <Widget>[
          new Positioned(
            bottom: 5.0,
            right: 7.0,
            child: new DecoratedBox(decoration: kBoxDecorationA)
          ),
          new Positioned(
            top: 10.0,
            left: 10.0,
            child: new DecoratedBox(decoration: kBoxDecorationB)
          ),
          new DecoratedBox(decoration: kBoxDecorationC),
        ]
      )
    );

    checkTree(tester, <TestParentData>[
      new TestParentData(bottom: 5.0, right: 7.0),
      new TestParentData(top: 10.0, left: 10.0),
      kNonPositioned,
    ]);

    DecoratedBox kDecoratedBoxA = new DecoratedBox(decoration: kBoxDecorationA);
    DecoratedBox kDecoratedBoxB = new DecoratedBox(decoration: kBoxDecorationB);
    DecoratedBox kDecoratedBoxC = new DecoratedBox(decoration: kBoxDecorationC);

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    await tester.pumpWidget(
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      new Stack(
        children: <Widget>[
          new Positioned(
            bottom: 5.0,
            right: 7.0,
            child: kDecoratedBoxA
          ),
          new Positioned(
            top: 10.0,
            left: 10.0,
            child: kDecoratedBoxB
          ),
          kDecoratedBoxC,
        ]
      )
    );

    checkTree(tester, <TestParentData>[
      new TestParentData(bottom: 5.0, right: 7.0),
      new TestParentData(top: 10.0, left: 10.0),
      kNonPositioned,
    ]);

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    await tester.pumpWidget(
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      new Stack(
        children: <Widget>[
          new Positioned(
            bottom: 6.0,
            right: 8.0,
            child: kDecoratedBoxA
          ),
          new Positioned(
            left: 10.0,
            right: 10.0,
            child: kDecoratedBoxB
          ),
          kDecoratedBoxC,
        ]
      )
    );

    checkTree(tester, <TestParentData>[
      new TestParentData(bottom: 6.0, right: 8.0),
      new TestParentData(left: 10.0, right: 10.0),
      kNonPositioned,
    ]);

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    await tester.pumpWidget(
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      new Stack(
        children: <Widget>[
          kDecoratedBoxA,
          new Positioned(
            left: 11.0,
            right: 12.0,
            child: new Container(child: kDecoratedBoxB)
          ),
          kDecoratedBoxC,
        ]
      )
    );

    checkTree(tester, <TestParentData>[
      kNonPositioned,
      new TestParentData(left: 11.0, right: 12.0),
      kNonPositioned,
    ]);

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    await tester.pumpWidget(
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      new Stack(
        children: <Widget>[
          kDecoratedBoxA,
          new Positioned(
            right: 10.0,
            child: new Container(child: kDecoratedBoxB)
          ),
          new Container(
            child: new Positioned(
              top: 8.0,
              child: kDecoratedBoxC
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            )
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          )
        ]
      )
    );

    checkTree(tester, <TestParentData>[
      kNonPositioned,
      new TestParentData(right: 10.0),
      new TestParentData(top: 8.0),
    ]);

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    await tester.pumpWidget(
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      new Stack(
        children: <Widget>[
          new Positioned(
            right: 10.0,
            child: new FlipWidget(left: kDecoratedBoxA, right: kDecoratedBoxB)
          ),
        ]
      )
    );

    checkTree(tester, <TestParentData>[
      new TestParentData(right: 10.0),
    ]);

    flipStatefulWidget(tester);
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    await tester.pump();
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    checkTree(tester, <TestParentData>[
      new TestParentData(right: 10.0),
    ]);

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    await tester.pumpWidget(
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      new Stack(
        children: <Widget>[
          new Positioned(
            top: 7.0,
            child: new FlipWidget(left: kDecoratedBoxA, right: kDecoratedBoxB)
          ),
        ]
      )
    );

    checkTree(tester, <TestParentData>[
      new TestParentData(top: 7.0),
    ]);

    flipStatefulWidget(tester);
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    await tester.pump();
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    checkTree(tester, <TestParentData>[
      new TestParentData(top: 7.0),
    ]);

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    await tester.pumpWidget(
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      new Stack()
    );

    checkTree(tester, <TestParentData>[]);
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  });

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  testWidgets('ParentDataWidget conflicting data', (WidgetTester tester) async {
    await tester.pumpWidget(
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      new Stack(
        children: <Widget>[
          new Positioned(
            top: 5.0,
            bottom: 8.0,
            child: new Positioned(
              top: 6.0,
              left: 7.0,
              child: new DecoratedBox(decoration: kBoxDecorationB)
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            )
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          )
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        ]
      )
    );
    expect(tester.takeException(), isNotNull);
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    await tester.pumpWidget(new Stack());
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    checkTree(tester, <TestParentData>[]);
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    await tester.pumpWidget(
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      new Container(
        child: new Flex(
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          children: <Widget>[
            new Positioned(
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              top: 6.0,
              left: 7.0,
              child: new DecoratedBox(decoration: kBoxDecorationB)
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            )
          ]
        )
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      )
    );
    expect(tester.takeException(), isNotNull);
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    await tester.pumpWidget(
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      new Stack()
    );
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    checkTree(tester, <TestParentData>[]);
  });
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  testWidgets('ParentDataWidget interacts with global keys', (WidgetTester tester) async {
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    GlobalKey key = new GlobalKey();
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    await tester.pumpWidget(
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      new Stack(
        children: <Widget>[
          new Positioned(
            top: 10.0,
            left: 10.0,
            child: new DecoratedBox(key: key, decoration: kBoxDecorationA)
          )
        ]
      )
    );

    checkTree(tester, <TestParentData>[
      new TestParentData(top: 10.0, left: 10.0),
    ]);

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    await tester.pumpWidget(
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      new Stack(
        children: <Widget>[
          new Positioned(
            top: 10.0,
            left: 10.0,
            child: new DecoratedBox(
              decoration: kBoxDecorationB,
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              child: new DecoratedBox(key: key, decoration: kBoxDecorationA)
            )
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          )
        ]
      )
    );

    checkTree(tester, <TestParentData>[
      new TestParentData(top: 10.0, left: 10.0),
    ]);

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    await tester.pumpWidget(
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      new Stack(
        children: <Widget>[
          new Positioned(
            top: 10.0,
            left: 10.0,
            child: new DecoratedBox(key: key, decoration: kBoxDecorationA)
          )
        ]
      )
    );
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    checkTree(tester, <TestParentData>[
      new TestParentData(top: 10.0, left: 10.0),
    ]);
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  });
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}