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77 lines
2.5 KiB
Dart
77 lines
2.5 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter_web/material.dart';
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import 'package:flutter_web/rendering.dart';
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import 'package:flutter_web_test/flutter_web_test.dart' show TestVSync;
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import '../flutter_test_alternative.dart';
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import 'rendering_tester.dart';
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int countSemanticsChildren(RenderObject object) {
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int count = 0;
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object.visitChildrenForSemantics((RenderObject child) {
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count += 1;
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});
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return count;
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}
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void main() {
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test('RenderOpacity and children and semantics', () {
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final RenderOpacity box = RenderOpacity(
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child: RenderParagraph(
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const TextSpan(),
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textDirection: TextDirection.ltr,
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),
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);
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expect(countSemanticsChildren(box), 1);
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box.opacity = 0.5;
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expect(countSemanticsChildren(box), 1);
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box.opacity = 0.25;
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expect(countSemanticsChildren(box), 1);
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box.opacity = 0.125;
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expect(countSemanticsChildren(box), 1);
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box.opacity = 0.0;
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expect(countSemanticsChildren(box), 0);
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box.opacity = 0.125;
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expect(countSemanticsChildren(box), 1);
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box.opacity = 0.0;
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expect(countSemanticsChildren(box), 0);
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});
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test('RenderOpacity and children and semantics', () {
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final AnimationController controller =
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AnimationController(vsync: const TestVSync());
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final RenderAnimatedOpacity box = RenderAnimatedOpacity(
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alwaysIncludeSemantics: false,
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opacity: controller,
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child: RenderParagraph(
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const TextSpan(),
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textDirection: TextDirection.ltr,
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),
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);
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expect(countSemanticsChildren(box), 0); // controller defaults to 0.0
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controller.value = 0.2; // has no effect, box isn't subscribed yet
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expect(countSemanticsChildren(box), 0);
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controller.value = 1.0; // ditto
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expect(countSemanticsChildren(box), 0); // alpha is still 0
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layout(box); // this causes the box to attach, which makes it subscribe
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expect(countSemanticsChildren(box), 1);
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controller.value = 1.0;
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expect(countSemanticsChildren(box), 1);
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controller.value = 0.5;
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expect(countSemanticsChildren(box), 1);
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controller.value = 0.25;
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expect(countSemanticsChildren(box), 1);
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controller.value = 0.125;
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expect(countSemanticsChildren(box), 1);
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controller.value = 0.0;
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expect(countSemanticsChildren(box), 0);
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controller.value = 0.125;
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expect(countSemanticsChildren(box), 1);
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controller.value = 0.0;
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expect(countSemanticsChildren(box), 0);
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});
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}
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