packages/flutter/test/widgets/overflow_box_test.dart

// Copyright 2014 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 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('OverflowBox control test', (WidgetTester tester) async {
    final GlobalKey inner = GlobalKey();
    await tester.pumpWidget(Align(
      alignment: Alignment.bottomRight,
      child: SizedBox(
        width: 10.0,
        height: 20.0,
        child: OverflowBox(
          minWidth: 0.0,
          maxWidth: 100.0,
          minHeight: 0.0,
          maxHeight: 50.0,
          child: Container(
            key: inner,
          ),
        ),
      ),
    ));
    final RenderBox box = inner.currentContext!.findRenderObject()! as RenderBox;
    expect(box.localToGlobal(Offset.zero), equals(const Offset(745.0, 565.0)));
    expect(box.size, equals(const Size(100.0, 50.0)));
  });

  // Adapted from https://github.com/flutter/flutter/issues/129094
  group('when fit is OverflowBoxFit.deferToChild', () {
    group('OverflowBox behavior with long and short content', () {
      for (final bool contentSuperLong in <bool>[false, true]) {
        testWidgets('contentSuperLong=$contentSuperLong', (WidgetTester tester) async {
          final GlobalKey<State<StatefulWidget>> key = GlobalKey();

          final Column child = Column(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              SizedBox(width: 100, height: contentSuperLong ? 10000 : 100),
            ],
          );

          await tester.pumpWidget(Directionality(
            textDirection: TextDirection.ltr,
            child: Stack(
              children: <Widget>[
                Container(
                  key: key,
                  child: OverflowBox(
                    maxHeight: 1000000,
                    fit: OverflowBoxFit.deferToChild,
                    child: child,
                  ),
                ),
              ],
            ),
          ));

          expect(tester.getBottomLeft(find.byKey(key)).dy, contentSuperLong ? 600 : 100);
        });
      }
    });

    testWidgets('no child', (WidgetTester tester) async {
      final GlobalKey<State<StatefulWidget>> key = GlobalKey();

      await tester.pumpWidget(Directionality(
        textDirection: TextDirection.ltr,
        child: Stack(
          children: <Widget>[
            Container(
              key: key,
              child: const OverflowBox(
                maxHeight: 1000000,
                fit: OverflowBoxFit.deferToChild,
                // no child
              ),
            ),
          ],
        ),
      ));

      expect(tester.getBottomLeft(find.byKey(key)).dy, 0);
    });
  });

  testWidgets('OverflowBox implements debugFillProperties', (WidgetTester tester) async {
    final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
    const OverflowBox(
      minWidth: 1.0,
      maxWidth: 2.0,
      minHeight: 3.0,
      maxHeight: 4.0,
    ).debugFillProperties(builder);
    final List<String> description = builder.properties
        .where((DiagnosticsNode n) => !n.isFiltered(DiagnosticLevel.info))
        .map((DiagnosticsNode n) => n.toString()).toList();
    expect(description, <String>[
      'alignment: Alignment.center',
      'minWidth: 1.0',
      'maxWidth: 2.0',
      'minHeight: 3.0',
      'maxHeight: 4.0',
      'fit: max',
    ]);
  });

  testWidgets('SizedOverflowBox alignment', (WidgetTester tester) async {
    final GlobalKey inner = GlobalKey();
    await tester.pumpWidget(Directionality(
      textDirection: TextDirection.rtl,
      child: Center(
        child: SizedOverflowBox(
          size: const Size(100.0, 100.0),
          alignment: Alignment.topRight,
          child: SizedBox(height: 50.0, width: 50.0, key: inner),
        ),
      ),
    ));
    final RenderBox box = inner.currentContext!.findRenderObject()! as RenderBox;
    expect(box.size, equals(const Size(50.0, 50.0)));
    expect(
      box.localToGlobal(box.size.center(Offset.zero)),
      equals(const Offset(
        (800.0 - 100.0) / 2.0 + 100.0 - 50.0 / 2.0,
        (600.0 - 100.0) / 2.0 + 0.0 + 50.0 / 2.0,
      )),
    );
  });

  testWidgets('SizedOverflowBox alignment (direction-sensitive)', (WidgetTester tester) async {
    final GlobalKey inner = GlobalKey();
    await tester.pumpWidget(Directionality(
      textDirection: TextDirection.rtl,
      child: Center(
        child: SizedOverflowBox(
          size: const Size(100.0, 100.0),
          alignment: AlignmentDirectional.bottomStart,
          child: SizedBox(height: 50.0, width: 50.0, key: inner),
        ),
      ),
    ));
    final RenderBox box = inner.currentContext!.findRenderObject()! as RenderBox;
    expect(box.size, equals(const Size(50.0, 50.0)));
    expect(
      box.localToGlobal(box.size.center(Offset.zero)),
      equals(const Offset(
        (800.0 - 100.0) / 2.0 + 100.0 - 50.0 / 2.0,
        (600.0 - 100.0) / 2.0 + 100.0 - 50.0 / 2.0,
      )),
    );
  });
}