lib/web_ui/test/html/paragraph/text_overflow_golden_test.dart

// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';

import 'package:test/bootstrap/browser.dart';
import 'package:ui/src/engine.dart';
import 'package:ui/ui.dart' hide window;

import '../../common/test_initialization.dart';
import 'text_goldens.dart';

const String threeLines = 'First\nSecond\nThird';
const String veryLong =
    'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.';

void main() {
  internalBootstrapBrowserTest(() => testMain);
}

Future<void> testMain() async {
  final EngineGoldenTester goldenTester = await EngineGoldenTester.initialize(
    viewportSize: const Size(800, 800),
  );

  setUpUnitTests(
    withImplicitView: true,
    emulateTesterEnvironment: false,
    setUpTestViewDimensions: false,
  );

  testEachCanvas('maxLines clipping', (EngineCanvas canvas) {
    Offset offset = Offset.zero;
    CanvasParagraph p;

    // All three lines are rendered.
    p = paragraph(threeLines);
    canvas.drawParagraph(p, offset);
    offset = offset.translate(0, p.height + 10);

    // Only the first two lines are rendered.
    p = paragraph(threeLines, paragraphStyle: ParagraphStyle(maxLines: 2));
    canvas.drawParagraph(p, offset);
    offset = offset.translate(0, p.height + 10);

    // The whole text is rendered.
    p = paragraph(veryLong, maxWidth: 200);
    canvas.drawParagraph(p, offset);
    offset = offset.translate(0, p.height + 10);

    // Only the first two lines are rendered.
    p = paragraph(veryLong,
        paragraphStyle: ParagraphStyle(maxLines: 2), maxWidth: 200);
    canvas.drawParagraph(p, offset);
    offset = offset.translate(0, p.height + 10);

    return goldenTester.diffCanvasScreenshot(canvas, 'text_max_lines');
  });
}