shape_decoration_test.dart 5.12 KB
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// 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
// found in the LICENSE file.

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import 'dart:ui' as ui;
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import 'package:flutter/foundation.dart';
import 'package:flutter/painting.dart';
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import 'package:flutter_test/flutter_test.dart';

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import '../rendering/mock_canvas.dart';
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import '../rendering/rendering_tester.dart';
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void main() {
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  TestRenderingFlutterBinding(); // initializes the imageCache
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  test('ShapeDecoration constructor', () {
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    const Color colorR = Color(0xffff0000);
    const Color colorG = Color(0xff00ff00);
    const Gradient gradient = LinearGradient(colors: <Color>[colorR, colorG]);
    expect(const ShapeDecoration(shape: Border()), const ShapeDecoration(shape: Border()));
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    expect(() => ShapeDecoration(color: colorR, gradient: nonconst(gradient), shape: const Border()), throwsAssertionError);
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    expect(
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      ShapeDecoration.fromBoxDecoration(const BoxDecoration(shape: BoxShape.circle)),
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      const ShapeDecoration(shape: CircleBorder(side: BorderSide.none)),
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    );
    expect(
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      ShapeDecoration.fromBoxDecoration(BoxDecoration(shape: BoxShape.rectangle, borderRadius: BorderRadiusDirectional.circular(100.0))),
      ShapeDecoration(shape: RoundedRectangleBorder(borderRadius: BorderRadiusDirectional.circular(100.0))),
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    );
    expect(
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      ShapeDecoration.fromBoxDecoration(BoxDecoration(shape: BoxShape.circle, border: Border.all(color: colorG))),
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      const ShapeDecoration(shape: CircleBorder(side: BorderSide(color: colorG))),
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    );
    expect(
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      ShapeDecoration.fromBoxDecoration(BoxDecoration(shape: BoxShape.rectangle, border: Border.all(color: colorR))),
      ShapeDecoration(shape: Border.all(color: colorR)),
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    );
    expect(
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      ShapeDecoration.fromBoxDecoration(const BoxDecoration(shape: BoxShape.rectangle, border: BorderDirectional(start: BorderSide()))),
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      const ShapeDecoration(shape: BorderDirectional(start: BorderSide())),
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    );
  });

  test('ShapeDecoration.lerp and hit test', () {
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    const Decoration a = ShapeDecoration(shape: CircleBorder());
    const Decoration b = ShapeDecoration(shape: RoundedRectangleBorder());
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    expect(Decoration.lerp(a, b, 0.0), a);
    expect(Decoration.lerp(a, b, 1.0), b);
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    const Size size = Size(200.0, 100.0); // at t=0.5, width will be 150 (x=25 to x=175).
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    expect(a.hitTest(size, const Offset(20.0, 50.0)), isFalse);
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    expect(Decoration.lerp(a, b, 0.1)!.hitTest(size, const Offset(20.0, 50.0)), isFalse);
    expect(Decoration.lerp(a, b, 0.5)!.hitTest(size, const Offset(20.0, 50.0)), isFalse);
    expect(Decoration.lerp(a, b, 0.9)!.hitTest(size, const Offset(20.0, 50.0)), isTrue);
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    expect(b.hitTest(size, const Offset(20.0, 50.0)), isTrue);
  });
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  test('ShapeDecoration.image RTL test', () async {
    final ui.Image image = await createTestImage(width: 100, height: 200);
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    final List<int> log = <int>[];
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    final ShapeDecoration decoration = ShapeDecoration(
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      shape: const CircleBorder(),
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      image: DecorationImage(
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        image: TestImageProvider(image),
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        alignment: AlignmentDirectional.bottomEnd,
      ),
    );
    final BoxPainter painter = decoration.createBoxPainter(() { log.add(0); });
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    expect((Canvas canvas) => painter.paint(canvas, Offset.zero, const ImageConfiguration(size: Size(100.0, 100.0))), paintsAssertion);
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    expect(
      (Canvas canvas) {
        return painter.paint(
          canvas,
          const Offset(20.0, -40.0),
          const ImageConfiguration(
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            size: Size(1000.0, 1000.0),
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            textDirection: TextDirection.rtl,
          ),
        );
      },
      paints
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        ..drawImageRect(source: const Rect.fromLTRB(0.0, 0.0, 100.0, 200.0), destination: const Rect.fromLTRB(20.0, 1000.0 - 40.0 - 200.0, 20.0 + 100.0, 1000.0 - 40.0)),
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    );
    expect(
      (Canvas canvas) {
        return painter.paint(
          canvas,
          Offset.zero,
          const ImageConfiguration(
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            size: Size(100.0, 200.0),
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            textDirection: TextDirection.ltr,
          ),
        );
      },
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      isNot(paints..image()), // we always use drawImageRect
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    );
    expect(log, isEmpty);
  });
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  test('ShapeDecoration.getClipPath', () {
    const ShapeDecoration decoration = ShapeDecoration(shape: CircleBorder(side: BorderSide.none));
    const Rect rect = Rect.fromLTWH(0.0, 0.0, 100.0, 20.0);
    final Path clipPath = decoration.getClipPath(rect, TextDirection.ltr);
    final Matcher isLookLikeExpectedPath = isPathThat(
      includes: const <Offset>[ Offset(50.0, 10.0), ],
      excludes: const <Offset>[ Offset(1.0, 1.0), Offset(30.0, 10.0), Offset(99.0, 19.0), ],
    );
    expect(clipPath, isLookLikeExpectedPath);
  });
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}

class TestImageProvider extends ImageProvider<TestImageProvider> {
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  TestImageProvider(this.image);

  final ui.Image image;

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  @override
  Future<TestImageProvider> obtainKey(ImageConfiguration configuration) {
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    return SynchronousFuture<TestImageProvider>(this);
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  }

  @override
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  ImageStreamCompleter load(TestImageProvider key, DecoderCallback decode) {
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    return OneFrameImageStreamCompleter(
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      SynchronousFuture<ImageInfo>(ImageInfo(image: image, scale: 1.0)),
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    );
  }
}