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This PR retries the previously reverted PR #169293. > [!NOTE] > This feature was originally intended to be Impeller-only, and it was agreed that no additional engine changes were necessary. However, during testing on the Metal backend, a shader loading issue occurred. In my view, this seems to be a simple problem caused by the shader not being included in the engine’s runtime_stages. ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. --------- Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com> Co-authored-by: Kate Lovett <katelovett@google.com>
57 lines
1.9 KiB
Dart
57 lines
1.9 KiB
Dart
// Copyright 2014 The Flutter 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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// This file is run as part of a reduced test set in CI on Mac and Windows
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// machines.
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@Tags(<String>['reduced-test-set'])
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library;
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import 'dart:ui' as ui;
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import 'package:flutter/widgets.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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// `StretchingOverscrollIndicator` uses a different algorithm when
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// shader is available, therefore the tests must be different depending
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// on shader support.
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final bool shaderSupported = ui.ImageFilter.isShaderFilterSupported;
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testWidgets(
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'Stretch effect covers full viewport',
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(WidgetTester tester) async {
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// This test verifies that when the stretch effect is applied to a scrollable widget,
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// it should cover the entire scrollable area (e.g., full height of the scroll view),
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// even if the actual content inside has a smaller height.
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//
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// Without this behavior, the shader is clipped only to the content area,
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// causing the stretch effect to render incorrectly or be invisible
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// when the content doesn't fill the scroll view.
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await tester.pumpWidget(
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Directionality(
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textDirection: TextDirection.ltr,
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child: StretchEffect(
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stretchStrength: 1,
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axis: Axis.vertical,
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child: Stack(
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alignment: Alignment.topCenter,
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children: <Widget>[
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Container(height: 100),
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Container(height: 50, color: const Color.fromRGBO(255, 0, 0, 1)),
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],
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),
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),
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),
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);
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await expectLater(
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find.byType(StretchEffect),
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matchesGoldenFile('stretch_effect_covers_full_viewport.png'),
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);
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},
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// Skips this test when fragment shaders are not used.
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skip: !shaderSupported,
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);
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}
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