date_picker_test.dart 55.2 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';

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import 'package:flutter/material.dart';
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import 'package:flutter/services.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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void main() {
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  TestWidgetsFlutterBinding.ensureInitialized();
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  late DateTime firstDate;
  late DateTime lastDate;
  late DateTime initialDate;
  late DateTime today;
  late SelectableDayPredicate? selectableDayPredicate;
  late DatePickerEntryMode initialEntryMode;
  late DatePickerMode initialCalendarMode;

  String? cancelText;
  String? confirmText;
  String? errorFormatText;
  String? errorInvalidText;
  String? fieldHintText;
  String? fieldLabelText;
  String? helpText;
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  TextInputType? keyboardType;
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  final Finder nextMonthIcon = find.byWidgetPredicate((Widget w) => w is IconButton && (w.tooltip?.startsWith('Next month') ?? false));
  final Finder previousMonthIcon = find.byWidgetPredicate((Widget w) => w is IconButton && (w.tooltip?.startsWith('Previous month') ?? false));
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  final Finder switchToInputIcon = find.byIcon(Icons.edit);
  final Finder switchToCalendarIcon = find.byIcon(Icons.calendar_today);

  TextField textField(WidgetTester tester) {
    return tester.widget<TextField>(find.byType(TextField));
  }
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  setUp(() {
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    firstDate = DateTime(2001);
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    lastDate = DateTime(2031, DateTime.december, 31);
    initialDate = DateTime(2016, DateTime.january, 15);
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    today = DateTime(2016, DateTime.january, 3);
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    selectableDayPredicate = null;
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    initialEntryMode = DatePickerEntryMode.calendar;
    initialCalendarMode = DatePickerMode.day;

    cancelText = null;
    confirmText = null;
    errorFormatText = null;
    errorInvalidText = null;
    fieldHintText = null;
    fieldLabelText = null;
    helpText = null;
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    keyboardType = null;
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  });
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  Future<void> prepareDatePicker(
    WidgetTester tester,
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    Future<void> Function(Future<DateTime?> date) callback, {
    TextDirection textDirection = TextDirection.ltr,
  }) async {
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    late BuildContext buttonContext;
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    await tester.pumpWidget(MaterialApp(
      home: Material(
        child: Builder(
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          builder: (BuildContext context) {
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            return ElevatedButton(
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              onPressed: () {
                buttonContext = context;
              },
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              child: const Text('Go'),
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            );
          },
        ),
      ),
    ));

    await tester.tap(find.text('Go'));
    expect(buttonContext, isNotNull);

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    final Future<DateTime?> date = showDatePicker(
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      context: buttonContext,
      initialDate: initialDate,
      firstDate: firstDate,
      lastDate: lastDate,
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      currentDate: today,
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      selectableDayPredicate: selectableDayPredicate,
      initialDatePickerMode: initialCalendarMode,
      initialEntryMode: initialEntryMode,
      cancelText: cancelText,
      confirmText: confirmText,
      errorFormatText: errorFormatText,
      errorInvalidText: errorInvalidText,
      fieldHintText: fieldHintText,
      fieldLabelText: fieldLabelText,
      helpText: helpText,
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      keyboardType: keyboardType,
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      builder: (BuildContext context, Widget? child) {
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        return Directionality(
          textDirection: textDirection,
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          child: child ?? const SizedBox(),
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        );
      },
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    );
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    await tester.pumpAndSettle(const Duration(seconds: 1));
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    await callback(date);
  }

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  group('showDatePicker Dialog', () {
    testWidgets('Cancel, confirm, and help text is used', (WidgetTester tester) async {
      cancelText = 'nope';
      confirmText = 'yep';
      helpText = 'help';
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        expect(find.text(cancelText!), findsOneWidget);
        expect(find.text(confirmText!), findsOneWidget);
        expect(find.text(helpText!), findsOneWidget);
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      });
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    });

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    testWidgets('Initial date is the default', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('OK'));
        expect(await date, DateTime(2016, DateTime.january, 15));
      });
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    });

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    testWidgets('Can cancel', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('CANCEL'));
        expect(await date, isNull);
      });
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    });

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    testWidgets('Can switch from calendar to input entry mode', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        expect(find.byType(TextField), findsNothing);
        await tester.tap(find.byIcon(Icons.edit));
        await tester.pumpAndSettle();
        expect(find.byType(TextField), findsOneWidget);
      });
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    });

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    testWidgets('Can switch from input to calendar entry mode', (WidgetTester tester) async {
      initialEntryMode = DatePickerEntryMode.input;
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
        expect(find.byType(TextField), findsOneWidget);
        await tester.tap(find.byIcon(Icons.calendar_today));
        await tester.pumpAndSettle();
        expect(find.byType(TextField), findsNothing);
      });
    });

    testWidgets('Can not switch out of calendarOnly mode', (WidgetTester tester) async {
      initialEntryMode = DatePickerEntryMode.calendarOnly;
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
        expect(find.byType(TextField), findsNothing);
        expect(find.byIcon(Icons.edit), findsNothing);
      });
    });

    testWidgets('Can not switch out of inputOnly mode', (WidgetTester tester) async {
      initialEntryMode = DatePickerEntryMode.inputOnly;
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
        expect(find.byType(TextField), findsOneWidget);
        expect(find.byIcon(Icons.calendar_today), findsNothing);
      });
    });

    testWidgets('Switching to input mode keeps selected date', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('12'));
        await tester.tap(find.byIcon(Icons.edit));
        await tester.pumpAndSettle();
        await tester.tap(find.text('OK'));
        expect(await date, DateTime(2016, DateTime.january, 12));
      });
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    });

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    testWidgets('Input only mode should validate date', (WidgetTester tester) async {
      initialEntryMode = DatePickerEntryMode.inputOnly;
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
        // Enter text input mode and type an invalid date to get error.
        await tester.enterText(find.byType(TextField), '1234567');
        await tester.tap(find.text('OK'));
        await tester.pumpAndSettle();
        expect(find.text('Invalid format.'), findsOneWidget);
      });
    });

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    testWidgets('Switching to input mode resets input error state', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        // Enter text input mode and type an invalid date to get error.
        await tester.tap(find.byIcon(Icons.edit));
        await tester.pumpAndSettle();
        await tester.enterText(find.byType(TextField), '1234567');
        await tester.tap(find.text('OK'));
        await tester.pumpAndSettle();
        expect(find.text('Invalid format.'), findsOneWidget);

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        // Toggle to calendar mode and then back to input mode
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        await tester.tap(find.byIcon(Icons.calendar_today));
        await tester.pumpAndSettle();
        await tester.tap(find.byIcon(Icons.edit));
        await tester.pumpAndSettle();
        expect(find.text('Invalid format.'), findsNothing);

        // Edit the text, the error should not be showing until ok is tapped
        await tester.enterText(find.byType(TextField), '1234567');
        await tester.pumpAndSettle();
        expect(find.text('Invalid format.'), findsNothing);
      });
    });

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    testWidgets('builder parameter', (WidgetTester tester) async {
      Widget buildFrame(TextDirection textDirection) {
        return MaterialApp(
          home: Material(
            child: Center(
              child: Builder(
                builder: (BuildContext context) {
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                  return ElevatedButton(
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                    child: const Text('X'),
                    onPressed: () {
                      showDatePicker(
                        context: context,
                        initialDate: DateTime.now(),
                        firstDate: DateTime(2018),
                        lastDate: DateTime(2030),
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                        builder: (BuildContext context, Widget? child) {
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                          return Directionality(
                            textDirection: textDirection,
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                            child: child ?? const SizedBox(),
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                          );
                        },
                      );
                    },
                  );
                },
              ),
            ),
          ),
        );
      }

      await tester.pumpWidget(buildFrame(TextDirection.ltr));
      await tester.tap(find.text('X'));
      await tester.pumpAndSettle();
      final double ltrOkRight = tester.getBottomRight(find.text('OK')).dx;

      await tester.tap(find.text('OK')); // Dismiss the dialog.
      await tester.pumpAndSettle();

      await tester.pumpWidget(buildFrame(TextDirection.rtl));
      await tester.tap(find.text('X'));
      await tester.pumpAndSettle();

      // Verify that the time picker is being laid out RTL.
      // We expect the left edge of the 'OK' button in the RTL
      // layout to match the gap between right edge of the 'OK'
      // button and the right edge of the 800 wide window.
      expect(tester.getBottomLeft(find.text('OK')).dx, 800 - ltrOkRight);
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    });

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    testWidgets('uses nested navigator if useRootNavigator is false', (WidgetTester tester) async {
      final _DatePickerObserver rootObserver = _DatePickerObserver();
      final _DatePickerObserver nestedObserver = _DatePickerObserver();

      await tester.pumpWidget(MaterialApp(
        navigatorObservers: <NavigatorObserver>[rootObserver],
        home: Navigator(
          observers: <NavigatorObserver>[nestedObserver],
          onGenerateRoute: (RouteSettings settings) {
            return MaterialPageRoute<dynamic>(
              builder: (BuildContext context) {
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                return ElevatedButton(
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                  onPressed: () {
                    showDatePicker(
                      context: context,
                      useRootNavigator: false,
                      initialDate: DateTime.now(),
                      firstDate: DateTime(2018),
                      lastDate: DateTime(2030),
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                      builder: (BuildContext context, Widget? child) => const SizedBox(),
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                    );
                  },
                  child: const Text('Show Date Picker'),
                );
              },
            );
          },
        ),
      ));

      // Open the dialog.
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      await tester.tap(find.byType(ElevatedButton));
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      expect(rootObserver.datePickerCount, 0);
      expect(nestedObserver.datePickerCount, 1);
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    });
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    testWidgets('honors DialogTheme for shape and elevation', (WidgetTester tester) async {
      // Test that the defaults work
      const DialogTheme datePickerDefaultDialogTheme = DialogTheme(
        shape: RoundedRectangleBorder(
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          borderRadius: BorderRadius.all(Radius.circular(4.0)),
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        ),
        elevation: 24,
      );
      await tester.pumpWidget(
        MaterialApp(
          home: Center(
            child: Builder(
              builder: (BuildContext context) {
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                return ElevatedButton(
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                  child: const Text('X'),
                  onPressed: () {
                    showDatePicker(
                      context: context,
                      initialDate: DateTime.now(),
                      firstDate: DateTime(2018),
                      lastDate: DateTime(2030),
                    );
                  },
                );
              },
            ),
          ),
        ),
      );
      await tester.tap(find.text('X'));
      await tester.pumpAndSettle();
      final Material defaultDialogMaterial = tester.widget<Material>(find.descendant(of: find.byType(Dialog), matching: find.byType(Material)).first);
      expect(defaultDialogMaterial.shape, datePickerDefaultDialogTheme.shape);
      expect(defaultDialogMaterial.elevation, datePickerDefaultDialogTheme.elevation);

      // Test that it honors ThemeData.dialogTheme settings
      const DialogTheme customDialogTheme = DialogTheme(
        shape: RoundedRectangleBorder(
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          borderRadius: BorderRadius.all(Radius.circular(40.0)),
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        ),
        elevation: 50,
      );
      await tester.pumpWidget(
        MaterialApp(
          theme: ThemeData.fallback().copyWith(dialogTheme: customDialogTheme),
          home: Center(
            child: Builder(
              builder: (BuildContext context) {
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                return ElevatedButton(
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                  child: const Text('X'),
                  onPressed: () {
                    showDatePicker(
                      context: context,
                      initialDate: DateTime.now(),
                      firstDate: DateTime(2018),
                      lastDate: DateTime(2030),
                    );
                  },
                );
              },
            ),
          ),
        ),
      );
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      await tester.pump(); // start theme animation
      await tester.pump(const Duration(seconds: 5)); // end theme animation
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      final Material themeDialogMaterial = tester.widget<Material>(find.descendant(of: find.byType(Dialog), matching: find.byType(Material)).first);
      expect(themeDialogMaterial.shape, customDialogTheme.shape);
      expect(themeDialogMaterial.elevation, customDialogTheme.elevation);
    });

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    testWidgets('OK Cancel button layout', (WidgetTester tester) async {
       Widget buildFrame(TextDirection textDirection) {
         return MaterialApp(
           home: Material(
             child: Center(
               child: Builder(
                 builder: (BuildContext context) {
                   return ElevatedButton(
                     child: const Text('X'),
                     onPressed: () {
                       showDatePicker(
                         context: context,
                         initialDate: DateTime(2016, DateTime.january, 15),
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                         firstDate:DateTime(2001),
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                         lastDate: DateTime(2031, DateTime.december, 31),
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                         builder: (BuildContext context, Widget? child) {
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                           return Directionality(
                             textDirection: textDirection,
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                             child: child ?? const SizedBox(),
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                           );
                         },
                       );
                     },
                   );
                 },
               ),
             ),
           ),
         );
       }

      // Default landscape layout.

      await tester.pumpWidget(buildFrame(TextDirection.ltr));
      await tester.tap(find.text('X'));
      await tester.pumpAndSettle();
      expect(tester.getBottomRight(find.text('OK')).dx, 622);
      expect(tester.getBottomLeft(find.text('OK')).dx, 594);
      expect(tester.getBottomRight(find.text('CANCEL')).dx, 560);
      await tester.tap(find.text('OK'));
      await tester.pumpAndSettle();

      await tester.pumpWidget(buildFrame(TextDirection.rtl));
      await tester.tap(find.text('X'));
      await tester.pumpAndSettle();
      expect(tester.getBottomRight(find.text('OK')).dx, 206);
      expect(tester.getBottomLeft(find.text('OK')).dx, 178);
      expect(tester.getBottomRight(find.text('CANCEL')).dx, 324);
      await tester.tap(find.text('OK'));
      await tester.pumpAndSettle();

      // Portrait layout.

      addTearDown(tester.binding.window.clearPhysicalSizeTestValue);
      tester.binding.window.physicalSizeTestValue = const Size(900, 1200);

      await tester.pumpWidget(buildFrame(TextDirection.ltr));
      await tester.tap(find.text('X'));
      await tester.pumpAndSettle();
      expect(tester.getBottomRight(find.text('OK')).dx, 258);
      expect(tester.getBottomLeft(find.text('OK')).dx, 230);
      expect(tester.getBottomRight(find.text('CANCEL')).dx, 196);
      await tester.tap(find.text('OK'));
      await tester.pumpAndSettle();

      await tester.pumpWidget(buildFrame(TextDirection.rtl));
      await tester.tap(find.text('X'));
      await tester.pumpAndSettle();
      expect(tester.getBottomRight(find.text('OK')).dx, 70);
      expect(tester.getBottomLeft(find.text('OK')).dx, 42);
      expect(tester.getBottomRight(find.text('CANCEL')).dx, 188);
      await tester.tap(find.text('OK'));
      await tester.pumpAndSettle();
    });
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  });
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  group('Calendar mode', () {
    testWidgets('Can select a day', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('12'));
        await tester.tap(find.text('OK'));
        expect(await date, equals(DateTime(2016, DateTime.january, 12)));
      });
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    });

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    testWidgets('Can select a month', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(previousMonthIcon);
        await tester.pumpAndSettle(const Duration(seconds: 1));
        await tester.tap(find.text('25'));
        await tester.tap(find.text('OK'));
        expect(await date, DateTime(2015, DateTime.december, 25));
      });
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    });

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    testWidgets('Can select a year', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('January 2016')); // Switch to year mode.
        await tester.pump();
        await tester.tap(find.text('2018'));
        await tester.pump();
        expect(find.text('January 2018'), findsOneWidget);
      });
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    });
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    testWidgets('Selecting date does not change displayed month', (WidgetTester tester) async {
      initialDate = DateTime(2020, DateTime.march, 15);
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(nextMonthIcon);
        await tester.pumpAndSettle(const Duration(seconds: 1));
        expect(find.text('April 2020'), findsOneWidget);
        await tester.tap(find.text('25'));
        await tester.pumpAndSettle();
        expect(find.text('April 2020'), findsOneWidget);
        // There isn't a 31 in April so there shouldn't be one if it is showing April
        expect(find.text('31'), findsNothing);
      });
    });

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    testWidgets('Changing year does not change selected date', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('January 2016'));
        await tester.pump();
        await tester.tap(find.text('2018'));
        await tester.pump();
        await tester.tap(find.text('OK'));
        expect(await date, equals(DateTime(2016, DateTime.january, 15)));
      });
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    });

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    testWidgets('Changing year does not change the month', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(nextMonthIcon);
        await tester.pumpAndSettle();
        await tester.tap(nextMonthIcon);
        await tester.pumpAndSettle();
        await tester.tap(find.text('March 2016'));
        await tester.pumpAndSettle();
        await tester.tap(find.text('2018'));
        await tester.pumpAndSettle();
        expect(find.text('March 2018'), findsOneWidget);
      });
    });

    testWidgets('Can select a year and then a day', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('January 2016')); // Switch to year mode.
        await tester.pump();
        await tester.tap(find.text('2017'));
        await tester.pump();
        await tester.tap(find.text('19'));
        await tester.tap(find.text('OK'));
        expect(await date, DateTime(2017, DateTime.january, 19));
      });
    });

    testWidgets('Current year is visible in year picker', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('January 2016')); // Switch to year mode.
        await tester.pump();
        expect(find.text('2016'), findsOneWidget);
      });
    });

    testWidgets('Cannot select a day outside bounds', (WidgetTester tester) async {
      initialDate = DateTime(2017, DateTime.january, 15);
      firstDate = initialDate;
      lastDate = initialDate;
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        // Earlier than firstDate. Should be ignored.
        await tester.tap(find.text('10'));
        // Later than lastDate. Should be ignored.
        await tester.tap(find.text('20'));
        await tester.tap(find.text('OK'));
        // We should still be on the initial date.
        expect(await date, initialDate);
      });
    });

    testWidgets('Cannot select a month past last date', (WidgetTester tester) async {
      initialDate = DateTime(2017, DateTime.january, 15);
      firstDate = initialDate;
      lastDate = DateTime(2017, DateTime.february, 20);
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(nextMonthIcon);
        await tester.pumpAndSettle(const Duration(seconds: 1));
        // Shouldn't be possible to keep going into March.
        expect(nextMonthIcon, findsNothing);
      });
    });

    testWidgets('Cannot select a month before first date', (WidgetTester tester) async {
      initialDate = DateTime(2017, DateTime.january, 15);
      firstDate = DateTime(2016, DateTime.december, 10);
      lastDate = initialDate;
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(previousMonthIcon);
        await tester.pumpAndSettle(const Duration(seconds: 1));
        // Shouldn't be possible to keep going into November.
        expect(previousMonthIcon, findsNothing);
      });
    });

    testWidgets('Cannot select disabled year', (WidgetTester tester) async {
      initialDate = DateTime(2018, DateTime.july, 4);
      firstDate = DateTime(2018, DateTime.june, 9);
      lastDate = DateTime(2018, DateTime.december, 15);
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('July 2018')); // Switch to year mode.
        await tester.pumpAndSettle();
        await tester.tap(find.text('2016')); // Disabled, doesn't change the year.
        await tester.pumpAndSettle();
        await tester.tap(find.text('OK'));
        await tester.pumpAndSettle();
        expect(await date, DateTime(2018, DateTime.july, 4));
      });
    });

    testWidgets('Selecting firstDate year respects firstDate', (WidgetTester tester) async {
      initialDate = DateTime(2018, DateTime.may, 4);
      firstDate = DateTime(2016, DateTime.june, 9);
      lastDate = DateTime(2019, DateTime.january, 15);
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('May 2018'));
        await tester.pumpAndSettle();
        await tester.tap(find.text('2016'));
        await tester.pumpAndSettle();
        // Month should be clamped to June as the range starts at June 2016
        expect(find.text('June 2016'), findsOneWidget);
      });
    });

    testWidgets('Selecting lastDate year respects lastDate', (WidgetTester tester) async {
      initialDate = DateTime(2018, DateTime.may, 4);
      firstDate = DateTime(2016, DateTime.june, 9);
      lastDate = DateTime(2019, DateTime.january, 15);
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('May 2018'));
        await tester.pumpAndSettle();
        await tester.tap(find.text('2019'));
        await tester.pumpAndSettle();
        // Month should be clamped to January as the range ends at January 2019
        expect(find.text('January 2019'), findsOneWidget);
      });
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    });

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    testWidgets('Only predicate days are selectable', (WidgetTester tester) async {
      initialDate = DateTime(2017, DateTime.january, 16);
      firstDate = DateTime(2017, DateTime.january, 10);
      lastDate = DateTime(2017, DateTime.january, 20);
      selectableDayPredicate = (DateTime day) => day.day.isEven;
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('13')); // Odd, doesn't work.
        await tester.tap(find.text('10')); // Even, works.
        await tester.tap(find.text('17')); // Odd, doesn't work.
        await tester.tap(find.text('OK'));
        expect(await date, DateTime(2017, DateTime.january, 10));
      });
    });
637

638
    testWidgets('Can select initial calendar picker mode', (WidgetTester tester) async {
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      initialDate = DateTime(2014, DateTime.january, 15);
      initialCalendarMode = DatePickerMode.year;
641
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.pump();
        // 2018 wouldn't be available if the year picker wasn't showing.
        // The initial current year is 2014.
        await tester.tap(find.text('2018'));
        await tester.pump();
        expect(find.text('January 2018'), findsOneWidget);
      });
649
    });
650

651 652
    testWidgets('currentDate is highlighted', (WidgetTester tester) async {
      today = DateTime(2016, 1, 2);
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.pump();
        const Color todayColor = Color(0xff2196f3); // default primary color
        expect(
          Material.of(tester.element(find.text('2'))),
          // The current day should be painted with a circle outline
659
          paints..circle(color: todayColor, style: PaintingStyle.stroke, strokeWidth: 1.0),
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        );
      });
    });
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    testWidgets('Selecting date does not switch picker to year selection', (WidgetTester tester) async {
      initialDate = DateTime(2020, DateTime.may, 10);
      initialCalendarMode = DatePickerMode.year;
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.pump();
        await tester.tap(find.text('2017'));
        await tester.pump();
        expect(find.text('May 2017'), findsOneWidget);
        await tester.tap(find.text('10'));
        await tester.pump();
        expect(find.text('May 2017'), findsOneWidget);
        expect(find.text('2017'), findsNothing);
      });
    });
678
  });
679

680 681
  group('Input mode', () {
    setUp(() {
682
      firstDate = DateTime(2015);
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      lastDate = DateTime(2017, DateTime.december, 31);
      initialDate = DateTime(2016, DateTime.january, 15);
      initialEntryMode = DatePickerEntryMode.input;
    });

    testWidgets('Initial entry mode is used', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        expect(find.byType(TextField), findsOneWidget);
      });
    });

    testWidgets('Hint, label, and help text is used', (WidgetTester tester) async {
      cancelText = 'nope';
      confirmText = 'yep';
      fieldHintText = 'hint';
      fieldLabelText = 'label';
      helpText = 'help';
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        expect(find.text(cancelText!), findsOneWidget);
        expect(find.text(confirmText!), findsOneWidget);
        expect(find.text(fieldHintText!), findsOneWidget);
        expect(find.text(fieldLabelText!), findsOneWidget);
        expect(find.text(helpText!), findsOneWidget);
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      });
    });

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    testWidgets('KeyboardType is used', (WidgetTester tester) async {
      keyboardType = TextInputType.text;
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
        final TextField field = textField(tester);
        expect(field.keyboardType, TextInputType.text);
      });
    });

717
    testWidgets('Initial date is the default', (WidgetTester tester) async {
718
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        await tester.tap(find.text('OK'));
        expect(await date, DateTime(2016, DateTime.january, 15));
      });
    });

    testWidgets('Can toggle to calendar entry mode', (WidgetTester tester) async {
725
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        expect(find.byType(TextField), findsOneWidget);
        await tester.tap(find.byIcon(Icons.calendar_today));
        await tester.pumpAndSettle();
        expect(find.byType(TextField), findsNothing);
      });
    });

    testWidgets('Toggle to calendar mode keeps selected date', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
735
        final TextField field = textField(tester);
736
        field.controller!.clear();
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        await tester.enterText(find.byType(TextField), '12/25/2016');
        await tester.tap(find.byIcon(Icons.calendar_today));
        await tester.pumpAndSettle();
        await tester.tap(find.text('OK'));
        expect(await date, DateTime(2016, DateTime.december, 25));
      });
    });

    testWidgets('Entered text returns date', (WidgetTester tester) async {
747
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
748
        final TextField field = textField(tester);
749
        field.controller!.clear();
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        await tester.enterText(find.byType(TextField), '12/25/2016');
        await tester.tap(find.text('OK'));
        expect(await date, DateTime(2016, DateTime.december, 25));
      });
    });

    testWidgets('Too short entered text shows error', (WidgetTester tester) async {
      errorFormatText = 'oops';
759
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
760
        final TextField field = textField(tester);
761
        field.controller!.clear();
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        await tester.pumpAndSettle();
        await tester.enterText(find.byType(TextField), '1225');
765
        expect(find.text(errorFormatText!), findsNothing);
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        await tester.tap(find.text('OK'));
        await tester.pumpAndSettle();
769
        expect(find.text(errorFormatText!), findsOneWidget);
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      });
    });

    testWidgets('Bad format entered text shows error', (WidgetTester tester) async {
      errorFormatText = 'oops';
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
776
        final TextField field = textField(tester);
777
        field.controller!.clear();
778 779

        await tester.pumpAndSettle();
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        await tester.enterText(find.byType(TextField), '20 days, 3 months, 2003');
        expect(find.text('20 days, 3 months, 2003'), findsOneWidget);
782
        expect(find.text(errorFormatText!), findsNothing);
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        await tester.tap(find.text('OK'));
        await tester.pumpAndSettle();
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        expect(find.text(errorFormatText!), findsOneWidget);
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      });
    });

    testWidgets('Invalid entered text shows error', (WidgetTester tester) async {
      errorInvalidText = 'oops';
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
793
        final TextField field = textField(tester);
794
        field.controller!.clear();
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        await tester.pumpAndSettle();
        await tester.enterText(find.byType(TextField), '08/10/1969');
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        expect(find.text(errorInvalidText!), findsNothing);
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        await tester.tap(find.text('OK'));
        await tester.pumpAndSettle();
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        expect(find.text(errorInvalidText!), findsOneWidget);
803
      });
804
    });
805
  });
806

807
  group('Semantics', () {
808
    testWidgets('calendar mode', (WidgetTester tester) async {
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      final SemanticsHandle semantics = tester.ensureSemantics();
810
      addTearDown(semantics.dispose);
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        // Header
        expect(tester.getSemantics(find.text('SELECT DATE')), matchesSemantics(
          label: 'SELECT DATE\nFri, Jan 15',
        ));

        // Input mode toggle button
        expect(tester.getSemantics(switchToInputIcon), matchesSemantics(
820
          tooltip: 'Switch to input',
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          isButton: true,
          hasTapAction: true,
          isEnabled: true,
          hasEnabledState: true,
          isFocusable: true,
        ));

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        // The semantics of the CalendarDatePicker are tested in its tests.
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        // Ok/Cancel buttons
        expect(tester.getSemantics(find.text('OK')), matchesSemantics(
          label: 'OK',
          isButton: true,
          hasTapAction: true,
          isEnabled: true,
          hasEnabledState: true,
          isFocusable: true,
        ));
        expect(tester.getSemantics(find.text('CANCEL')), matchesSemantics(
          label: 'CANCEL',
          isButton: true,
          hasTapAction: true,
          isEnabled: true,
          hasEnabledState: true,
          isFocusable: true,
        ));
      });
    });
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    testWidgets('input mode', (WidgetTester tester) async {
      final SemanticsHandle semantics = tester.ensureSemantics();
852
      addTearDown(semantics.dispose);
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      initialEntryMode = DatePickerEntryMode.input;
855
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        // Header
        expect(tester.getSemantics(find.text('SELECT DATE')), matchesSemantics(
          label: 'SELECT DATE\nFri, Jan 15',
        ));

        // Input mode toggle button
        expect(tester.getSemantics(switchToCalendarIcon), matchesSemantics(
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          tooltip: 'Switch to calendar',
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          isButton: true,
          hasTapAction: true,
          isEnabled: true,
          hasEnabledState: true,
          isFocusable: true,
        ));

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        // The semantics of the InputDatePickerFormField are tested in its tests.
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        // Ok/Cancel buttons
        expect(tester.getSemantics(find.text('OK')), matchesSemantics(
          label: 'OK',
          isButton: true,
          hasTapAction: true,
          isEnabled: true,
          hasEnabledState: true,
          isFocusable: true,
        ));
        expect(tester.getSemantics(find.text('CANCEL')), matchesSemantics(
          label: 'CANCEL',
          isButton: true,
          hasTapAction: true,
          isEnabled: true,
          hasEnabledState: true,
          isFocusable: true,
        ));
      });
    });
892
  });
893

894 895
  group('Keyboard navigation', () {
    testWidgets('Can toggle to calendar entry mode', (WidgetTester tester) async {
896
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        expect(find.byType(TextField), findsNothing);
        // Navigate to the entry toggle button and activate it
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
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        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
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        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();
        // Should be in the input mode
        expect(find.byType(TextField), findsOneWidget);
      });
    });

    testWidgets('Can toggle to year mode', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        expect(find.text('2016'), findsNothing);
        // Navigate to the year selector and activate it
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();
        // The years should be visible
        expect(find.text('2016'), findsOneWidget);
      });
    });

    testWidgets('Can navigate next/previous months', (WidgetTester tester) async {
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      await prepareDatePicker(tester, (Future<DateTime?> date) async {
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        expect(find.text('January 2016'), findsOneWidget);
        // Navigate to the previous month button and activate it twice
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();
        // Should be showing Nov 2015
        expect(find.text('November 2015'), findsOneWidget);

        // Navigate to the next month button and activate it four times
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();
        // Should be on Mar 2016
        expect(find.text('March 2016'), findsOneWidget);
      });
    });
950 951

    testWidgets('Can navigate date grid with arrow keys', (WidgetTester tester) async {
952
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987
        // Navigate to the grid
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);

        // Navigate from Jan 15 to Jan 18 with arrow keys
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowLeft);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowLeft);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowDown);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowDown);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowLeft);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowLeft);
        await tester.pumpAndSettle();

        // Activate it
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();

        // Navigate out of the grid and to the OK button
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);

        // Activate OK
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();

        // Should have selected Jan 18
        expect(await date, DateTime(2016, DateTime.january, 18));
      });
    });

    testWidgets('Navigating with arrow keys scrolls months', (WidgetTester tester) async {
988
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035
        // Navigate to the grid
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.pumpAndSettle();

        // Navigate from Jan 15 to Dec 31 with arrow keys
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowLeft);
        await tester.pumpAndSettle();

        // Should have scrolled to Dec 2015
        expect(find.text('December 2015'), findsOneWidget);

        // Navigate from Dec 31 to Nov 26 with arrow keys
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp);
        await tester.pumpAndSettle();

        // Should have scrolled to Nov 2015
        expect(find.text('November 2015'), findsOneWidget);

        // Activate it
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();

        // Navigate out of the grid and to the OK button
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.pumpAndSettle();

        // Activate OK
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();

        // Should have selected Jan 18
        expect(await date, DateTime(2015, DateTime.november, 26));
      });
    });

    testWidgets('RTL text direction reverses the horizontal arrow key navigation', (WidgetTester tester) async {
1036
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
        // Navigate to the grid
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.pumpAndSettle();

        // Navigate from Jan 15 to 19 with arrow keys
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowRight);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowRight);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowRight);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowRight);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowDown);
        await tester.sendKeyEvent(LogicalKeyboardKey.arrowLeft);
        await tester.pumpAndSettle();

        // Activate it
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();

        // Navigate out of the grid and to the OK button
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.sendKeyEvent(LogicalKeyboardKey.tab);
        await tester.pumpAndSettle();

        // Activate OK
        await tester.sendKeyEvent(LogicalKeyboardKey.space);
        await tester.pumpAndSettle();

        // Should have selected Jan 18
        expect(await date, DateTime(2016, DateTime.january, 19));
1069
      }, textDirection: TextDirection.rtl);
1070
    });
1071 1072
  });

1073
  group('Screen configurations', () {
1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
    // Test various combinations of screen sizes, orientations and text scales
    // to ensure the layout doesn't overflow and cause an exception to be thrown.

    // Regression tests for https://github.com/flutter/flutter/issues/21383
    // Regression tests for https://github.com/flutter/flutter/issues/19744
    // Regression tests for https://github.com/flutter/flutter/issues/17745

    // Common screen size roughly based on a Pixel 1
    const Size kCommonScreenSizePortrait = Size(1070, 1770);
    const Size kCommonScreenSizeLandscape = Size(1770, 1070);

    // Small screen size based on a LG K130
    const Size kSmallScreenSizePortrait = Size(320, 521);
    const Size kSmallScreenSizeLandscape = Size(521, 320);

1089
    Future<void> showPicker(WidgetTester tester, Size size, [double textScaleFactor = 1.0]) async {
1090
      tester.binding.window.physicalSizeTestValue = size;
1091
      addTearDown(tester.binding.window.clearPhysicalSizeTestValue);
1092
      tester.binding.window.devicePixelRatioTestValue = 1.0;
1093
      addTearDown(tester.binding.window.clearDevicePixelRatioTestValue);
1094
      await prepareDatePicker(tester, (Future<DateTime?> date) async {
1095 1096
        await tester.tap(find.text('OK'));
      });
1097 1098 1099 1100
      await tester.pumpAndSettle();
    }

    testWidgets('common screen size - portrait', (WidgetTester tester) async {
1101
      await showPicker(tester, kCommonScreenSizePortrait);
1102 1103 1104 1105
      expect(tester.takeException(), isNull);
    });

    testWidgets('common screen size - landscape', (WidgetTester tester) async {
1106
      await showPicker(tester, kCommonScreenSizeLandscape);
1107 1108 1109 1110
      expect(tester.takeException(), isNull);
    });

    testWidgets('common screen size - portrait - textScale 1.3', (WidgetTester tester) async {
1111
      await showPicker(tester, kCommonScreenSizePortrait, 1.3);
1112 1113 1114 1115
      expect(tester.takeException(), isNull);
    });

    testWidgets('common screen size - landscape - textScale 1.3', (WidgetTester tester) async {
1116
      await showPicker(tester, kCommonScreenSizeLandscape, 1.3);
1117 1118 1119 1120
      expect(tester.takeException(), isNull);
    });

    testWidgets('small screen size - portrait', (WidgetTester tester) async {
1121
      await showPicker(tester, kSmallScreenSizePortrait);
1122 1123 1124 1125
      expect(tester.takeException(), isNull);
    });

    testWidgets('small screen size - landscape', (WidgetTester tester) async {
1126
      await showPicker(tester, kSmallScreenSizeLandscape);
1127 1128 1129 1130
      expect(tester.takeException(), isNull);
    });

    testWidgets('small screen size - portrait -textScale 1.3', (WidgetTester tester) async {
1131
      await showPicker(tester, kSmallScreenSizePortrait, 1.3);
1132 1133 1134 1135
      expect(tester.takeException(), isNull);
    });

    testWidgets('small screen size - landscape - textScale 1.3', (WidgetTester tester) async {
1136
      await showPicker(tester, kSmallScreenSizeLandscape, 1.3);
1137 1138 1139
      expect(tester.takeException(), isNull);
    });
  });
1140

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  group('showDatePicker avoids overlapping display features', () {
    testWidgets('positioning with anchorPoint', (WidgetTester tester) async {
      await tester.pumpWidget(
        MaterialApp(
          builder: (BuildContext context, Widget? child) {
            return MediaQuery(
              // Display has a vertical hinge down the middle
              data: const MediaQueryData(
                size: Size(800, 600),
                displayFeatures: <DisplayFeature>[
                  DisplayFeature(
                    bounds: Rect.fromLTRB(390, 0, 410, 600),
                    type: DisplayFeatureType.hinge,
                    state: DisplayFeatureState.unknown,
                  ),
                ],
              ),
              child: child!,
            );
          },
          home: const Center(child: Text('Test')),
        ),
      );

      final BuildContext context = tester.element(find.text('Test'));
      showDatePicker(
        context: context,
        initialDate: DateTime.now(),
        firstDate: DateTime(2018),
        lastDate: DateTime(2030),
        anchorPoint: const Offset(1000, 0),
      );
      await tester.pumpAndSettle();

      // Should take the right side of the screen
      expect(tester.getTopLeft(find.byType(DatePickerDialog)), const Offset(410.0, 0.0));
      expect(tester.getBottomRight(find.byType(DatePickerDialog)), const Offset(800.0, 600.0));
    });

    testWidgets('positioning with Directionality', (WidgetTester tester) async {
      await tester.pumpWidget(
        MaterialApp(
          builder: (BuildContext context, Widget? child) {
            return MediaQuery(
              // Display has a vertical hinge down the middle
              data: const MediaQueryData(
                size: Size(800, 600),
                displayFeatures: <DisplayFeature>[
                  DisplayFeature(
                    bounds: Rect.fromLTRB(390, 0, 410, 600),
                    type: DisplayFeatureType.hinge,
                    state: DisplayFeatureState.unknown,
                  ),
                ],
              ),
              child: Directionality(
                textDirection: TextDirection.rtl,
                child: child!,
              ),
            );
          },
          home: const Center(child: Text('Test')),
        ),
      );

      final BuildContext context = tester.element(find.text('Test'));
      showDatePicker(
        context: context,
        initialDate: DateTime.now(),
        firstDate: DateTime(2018),
        lastDate: DateTime(2030),
      );
      await tester.pumpAndSettle();

      // By default it should place the dialog on the right screen
      expect(tester.getTopLeft(find.byType(DatePickerDialog)), const Offset(410.0, 0.0));
      expect(tester.getBottomRight(find.byType(DatePickerDialog)), const Offset(800.0, 600.0));
    });

    testWidgets('positioning with defaults', (WidgetTester tester) async {
      await tester.pumpWidget(
        MaterialApp(
          builder: (BuildContext context, Widget? child) {
            return MediaQuery(
              // Display has a vertical hinge down the middle
              data: const MediaQueryData(
                size: Size(800, 600),
                displayFeatures: <DisplayFeature>[
                  DisplayFeature(
                    bounds: Rect.fromLTRB(390, 0, 410, 600),
                    type: DisplayFeatureType.hinge,
                    state: DisplayFeatureState.unknown,
                  ),
                ],
              ),
              child: child!,
            );
          },
          home: const Center(child: Text('Test')),
        ),
      );

      final BuildContext context = tester.element(find.text('Test'));
      showDatePicker(
        context: context,
        initialDate: DateTime.now(),
        firstDate: DateTime(2018),
        lastDate: DateTime(2030),
      );
      await tester.pumpAndSettle();

      // By default it should place the dialog on the left screen
      expect(tester.getTopLeft(find.byType(DatePickerDialog)), Offset.zero);
      expect(tester.getBottomRight(find.byType(DatePickerDialog)), const Offset(390.0, 600.0));
    });
  });

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  testWidgets('DatePickerDialog is state restorable', (WidgetTester tester) async {
    await tester.pumpWidget(
      const MaterialApp(
        restorationScopeId: 'app',
        home: _RestorableDatePickerDialogTestWidget(),
      ),
    );

    // The date picker should be closed.
    expect(find.byType(DatePickerDialog), findsNothing);
    expect(find.text('25/7/2021'), findsOneWidget);

    // Open the date picker.
    await tester.tap(find.text('X'));
    await tester.pumpAndSettle();
    expect(find.byType(DatePickerDialog), findsOneWidget);

    final TestRestorationData restorationData = await tester.getRestorationData();
    await tester.restartAndRestore();

    // The date picker should be open after restoring.
    expect(find.byType(DatePickerDialog), findsOneWidget);

    // Tap on the barrier.
    await tester.tapAt(const Offset(10.0, 10.0));
    await tester.pumpAndSettle();

    // The date picker should be closed, the text value updated to the
    // newly selected date.
    expect(find.byType(DatePickerDialog), findsNothing);
    expect(find.text('25/7/2021'), findsOneWidget);

    // The date picker should be open after restoring.
    await tester.restoreFrom(restorationData);
    expect(find.byType(DatePickerDialog), findsOneWidget);

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    // Select a different date.
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    await tester.tap(find.text('30'));
    await tester.pumpAndSettle();
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    // Restart after the new selection. It should remain selected.
    await tester.restartAndRestore();

    // Close the date picker.
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    await tester.tap(find.text('OK'));
    await tester.pumpAndSettle();

    // The date picker should be closed, the text value updated to the
    // newly selected date.
    expect(find.byType(DatePickerDialog), findsNothing);
    expect(find.text('30/7/2021'), findsOneWidget);
  }, skip: isBrowser); // https://github.com/flutter/flutter/issues/33615

  testWidgets('DatePickerDialog state restoration - DatePickerEntryMode', (WidgetTester tester) async {
    await tester.pumpWidget(
      const MaterialApp(
        restorationScopeId: 'app',
        home: _RestorableDatePickerDialogTestWidget(
          datePickerEntryMode: DatePickerEntryMode.calendarOnly,
        ),
      ),
    );

    // The date picker should be closed.
    expect(find.byType(DatePickerDialog), findsNothing);
    expect(find.text('25/7/2021'), findsOneWidget);

    // Open the date picker.
    await tester.tap(find.text('X'));
    await tester.pumpAndSettle();
    expect(find.byType(DatePickerDialog), findsOneWidget);

    // Only in calendar mode and cannot switch out.
    expect(find.byType(TextField), findsNothing);
    expect(find.byIcon(Icons.edit), findsNothing);

    final TestRestorationData restorationData = await tester.getRestorationData();
    await tester.restartAndRestore();

    // The date picker should be open after restoring.
    expect(find.byType(DatePickerDialog), findsOneWidget);
    // Only in calendar mode and cannot switch out.
    expect(find.byType(TextField), findsNothing);
    expect(find.byIcon(Icons.edit), findsNothing);

    // Tap on the barrier.
    await tester.tapAt(const Offset(10.0, 10.0));
    await tester.pumpAndSettle();

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    // The date picker should be closed, the text value should be the same
    // as before.
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    expect(find.byType(DatePickerDialog), findsNothing);
    expect(find.text('25/7/2021'), findsOneWidget);

    // The date picker should be open after restoring.
    await tester.restoreFrom(restorationData);
    expect(find.byType(DatePickerDialog), findsOneWidget);
    // Only in calendar mode and cannot switch out.
    expect(find.byType(TextField), findsNothing);
    expect(find.byIcon(Icons.edit), findsNothing);
  }, skip: isBrowser); // https://github.com/flutter/flutter/issues/33615
}

class _RestorableDatePickerDialogTestWidget extends StatefulWidget {
  const _RestorableDatePickerDialogTestWidget({
    this.datePickerEntryMode = DatePickerEntryMode.calendar,
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  });
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  final DatePickerEntryMode datePickerEntryMode;

  @override
  _RestorableDatePickerDialogTestWidgetState createState() => _RestorableDatePickerDialogTestWidgetState();
}

class _RestorableDatePickerDialogTestWidgetState extends State<_RestorableDatePickerDialogTestWidget> with RestorationMixin {
  @override
  String? get restorationId => 'scaffold_state';

  final RestorableDateTime _selectedDate = RestorableDateTime(DateTime(2021, 7, 25));
  late final RestorableRouteFuture<DateTime?> _restorableDatePickerRouteFuture = RestorableRouteFuture<DateTime?>(
    onComplete: _selectDate,
    onPresent: (NavigatorState navigator, Object? arguments) {
      return navigator.restorablePush(
        _datePickerRoute,
        arguments: <String, dynamic>{
          'selectedDate': _selectedDate.value.millisecondsSinceEpoch,
          'datePickerEntryMode': widget.datePickerEntryMode.index,
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        },
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      );
    },
  );

  @override
  void restoreState(RestorationBucket? oldBucket, bool initialRestore) {
    registerForRestoration(_selectedDate, 'selected_date');
    registerForRestoration(_restorableDatePickerRouteFuture, 'date_picker_route_future');
  }

  void _selectDate(DateTime? newSelectedDate) {
    if (newSelectedDate != null) {
      setState(() { _selectedDate.value = newSelectedDate; });
    }
  }

  static Route<DateTime> _datePickerRoute(
    BuildContext context,
    Object? arguments,
  ) {
    return DialogRoute<DateTime>(
      context: context,
      builder: (BuildContext context) {
        final Map<dynamic, dynamic> args = arguments! as Map<dynamic, dynamic>;
        return DatePickerDialog(
          restorationId: 'date_picker_dialog',
          initialEntryMode: DatePickerEntryMode.values[args['datePickerEntryMode'] as int],
          initialDate: DateTime.fromMillisecondsSinceEpoch(args['selectedDate'] as int),
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          firstDate: DateTime(2021),
          lastDate: DateTime(2022),
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        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    final DateTime selectedDateTime = _selectedDate.value;
    // Example: "25/7/1994"
    final String selectedDateTimeString = '${selectedDateTime.day}/${selectedDateTime.month}/${selectedDateTime.year}';
    return Scaffold(
      body: Center(
        child: Column(
          children: <Widget>[
            OutlinedButton(
              onPressed: () {
                _restorableDatePickerRouteFuture.present();
              },
              child: const Text('X'),
            ),
            Text(selectedDateTimeString),
          ],
        ),
      ),
    );
  }
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}

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class _DatePickerObserver extends NavigatorObserver {
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  int datePickerCount = 0;

  @override
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  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
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    if (route is DialogRoute) {
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      datePickerCount++;
    }
    super.didPush(route, previousRoute);
  }
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Ian Hickson committed
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}