flutter-go/packages/flutter_web/test/widgets/semantics_clipping_test.dart

// 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.
// Synced 2019-05-30T14:20:57.026926.

import 'package:flutter_web/material.dart';
import 'package:flutter_web/rendering.dart';
import 'package:flutter_web/widgets.dart';
import 'package:flutter_web_test/flutter_web_test.dart';

import 'semantics_tester.dart';

void main() {
  testWidgets('SemanticNode.rect is clipped', (WidgetTester tester) async {
    final SemanticsTester semantics = SemanticsTester(tester);

    await tester.pumpWidget(Directionality(
      textDirection: TextDirection.ltr,
      child: Center(
        child: Container(
          width: 100.0,
          child: Flex(
            direction: Axis.horizontal,
            children: <Widget>[
              Container(
                width: 75.0,
                child: const Text('1'),
              ),
              Container(
                width: 75.0,
                child: const Text('2'),
              ),
              Container(
                width: 75.0,
                child: const Text('3'),
              ),
            ],
          ),
        ),
      ),
    ));

    final dynamic exception = tester.takeException();
    expect(exception, isInstanceOf<FlutterError>());
    expect(exception.diagnostics.first.level, DiagnosticLevel.summary);
    expect(exception.diagnostics.first.toString(), contains('overflowed'));

    expect(
        semantics,
        hasSemantics(
          TestSemantics.root(
            children: <TestSemantics>[
              TestSemantics(
                label: '1',
                rect: const Rect.fromLTRB(0.0, 0.0, 75.0, 14.0),
              ),
              TestSemantics(
                label: '2',
                rect: const Rect.fromLTRB(
                    0.0, 0.0, 25.0, 14.0), // clipped form original 75.0 to 25.0
              ),
              // node with Text 3 not present.
            ],
          ),
          ignoreTransform: true,
          ignoreId: true,
        ));

    semantics.dispose();
  });

  testWidgets(
      'SemanticsNode is not removed if out of bounds and merged into something within bounds',
      (WidgetTester tester) async {
    final SemanticsTester semantics = SemanticsTester(tester);

    await tester.pumpWidget(Directionality(
      textDirection: TextDirection.ltr,
      child: Center(
        child: Container(
          width: 100.0,
          child: Flex(
            direction: Axis.horizontal,
            children: <Widget>[
              Container(
                width: 75.0,
                child: const Text('1'),
              ),
              MergeSemantics(
                child: Flex(
                  direction: Axis.horizontal,
                  children: <Widget>[
                    Container(
                      width: 75.0,
                      child: const Text('2'),
                    ),
                    Container(
                      width: 75.0,
                      child: const Text('3'),
                    ),
                  ],
                ),
              ),
            ],
          ),
        ),
      ),
    ));

    final dynamic exception = tester.takeException();
    expect(exception, isInstanceOf<FlutterError>());
    expect(exception.diagnostics.first.level, DiagnosticLevel.summary);
    expect(exception.diagnostics.first.toString(), contains('overflowed'));

    expect(
        semantics,
        hasSemantics(
          TestSemantics.root(
            children: <TestSemantics>[
              TestSemantics(
                label: '1',
                rect: const Rect.fromLTRB(0.0, 0.0, 75.0, 14.0),
              ),
              TestSemantics(
                label: '2\n3',
                rect: const Rect.fromLTRB(
                    0.0, 0.0, 25.0, 14.0), // clipped form original 75.0 to 25.0
              ),
            ],
          ),
          ignoreTransform: true,
          ignoreId: true,
        ));

    semantics.dispose();
  });
}