Date picker special labeling for currentDate with localization and te… (flutter#116433)

* Date picker special labeling for currentDate with localization and tests.

* Updated CalendarDatePicker semantics test

* removed recursive import

* changed labeling for current date to be less verbose

Author: harperl-lgtm

packages/flutter/lib/src/material/calendar_date_picker.dart

@@ -188,8 +188,10 @@ class _CalendarDatePickerState extends State<CalendarDatePicker> {
     _textDirection = Directionality.of(context);
     if (!_announcedInitialDate) {
       _announcedInitialDate = true;
+      final bool isToday = DateUtils.isSameDay(widget.currentDate, _selectedDate);
+      final String semanticLabelSuffix = isToday ? ', ${_localizations.currentDateLabel}' : '';
       SemanticsService.announce(
-        _localizations.formatFullDate(_selectedDate),
+        '${_localizations.formatFullDate(_selectedDate)}$semanticLabelSuffix',
         _textDirection,
       );
     }
@@ -968,6 +970,7 @@ class _DayPickerState extends State<_DayPicker> {
             (widget.selectableDayPredicate != null && !widget.selectableDayPredicate!(dayToBuild));
         final bool isSelectedDay = DateUtils.isSameDay(widget.selectedDate, dayToBuild);
         final bool isToday = DateUtils.isSameDay(widget.currentDate, dayToBuild);
+        final String semanticLabelSuffix = isToday ? ', ${localizations.currentDateLabel}' : '';
 
         BoxDecoration? decoration;
         Color dayColor = enabledDayColor;
@@ -1019,7 +1022,7 @@ class _DayPickerState extends State<_DayPicker> {
               // day of month before the rest of the date, as they are looking
               // for the day of month. To do that we prepend day of month to the
               // formatted full date.
-              label: '${localizations.formatDecimal(day)}, ${localizations.formatFullDate(dayToBuild)}',
+              label: '${localizations.formatDecimal(day)}, ${localizations.formatFullDate(dayToBuild)}$semanticLabelSuffix',
               selected: isSelectedDay,
               excludeSemantics: true,
               child: dayWidget,

packages/flutter/lib/src/material/date_picker.dart

@@ -2348,7 +2348,8 @@ class _MonthItemState extends State<_MonthItem> {
     // day of month before the rest of the date, as they are looking
     // for the day of month. To do that we prepend day of month to the
     // formatted full date.
-    String semanticLabel = '${localizations.formatDecimal(day)}, ${localizations.formatFullDate(dayToBuild)}';
+    final String semanticLabelSuffix = DateUtils.isSameDay(widget.currentDate, dayToBuild) ? ', ${localizations.currentDateLabel}' : '';
+    String semanticLabel = '${localizations.formatDecimal(day)}, ${localizations.formatFullDate(dayToBuild)}$semanticLabelSuffix';
     if (isSelectedDayStart) {
       semanticLabel = localizations.dateRangeStartDateSemanticLabel(semanticLabel);
     } else if (isSelectedDayEnd) {

packages/flutter/lib/src/material/material_localizations.dart

@@ -160,6 +160,9 @@ abstract class MaterialLocalizations {
   /// as a hint text in the text field.
   String get searchFieldLabel;
 
+  /// Label indicating that a given date is the current date.
+  String get currentDateLabel;
+
   /// The format used to lay out the time picker.
   ///
   /// The documentation for [TimeOfDayFormat] enum values provides details on
@@ -1015,6 +1018,9 @@ class DefaultMaterialLocalizations implements MaterialLocalizations {
   @override
   String get searchFieldLabel => 'Search';
 
+  @override
+  String get currentDateLabel => 'Today';
+
   @override
   String aboutListTileTitle(String applicationName) => 'About $applicationName';
 

packages/flutter/test/material/calendar_date_picker_test.dart

@@ -697,7 +697,7 @@ void main() {
           isFocusable: true,
         ));
         expect(tester.getSemantics(find.text('3')), matchesSemantics(
-          label: '3, Sunday, January 3, 2016',
+          label: '3, Sunday, January 3, 2016, Today',
           hasTapAction: true,
           isFocusable: true,
         ));

packages/flutter/test/material/date_picker_test.dart

@@ -822,6 +822,12 @@ void main() {
           label: 'SELECT DATE\nFri, Jan 15',
         ));
 
+        expect(tester.getSemantics(find.text('3')), matchesSemantics(
+          label: '3, Sunday, January 3, 2016, Today',
+          hasTapAction: true,
+          isFocusable: true,
+        ));
+
         // Input mode toggle button
         expect(tester.getSemantics(switchToInputIcon), matchesSemantics(
           tooltip: 'Switch to input',

packages/flutter/test/material/date_range_picker_test.dart

@@ -1085,6 +1085,24 @@ void main() {
       expect(tester.getBottomRight(find.byType(DateRangePickerDialog)), const Offset(390.0, 600.0));
     });
   });
+
+group('Semantics', () {
+  testWidgets('calendar mode', (WidgetTester tester) async {
+    final SemanticsHandle semantics = tester.ensureSemantics();
+    currentDate = DateTime(2016, DateTime.january, 30);
+    addTearDown(semantics.dispose);
+    await preparePicker(tester, (Future<DateTimeRange?> range) async {
+      expect(
+        tester.getSemantics(find.text('30')),
+        matchesSemantics(
+          label: '30, Saturday, January 30, 2016, Today',
+          hasTapAction: true,
+          isFocusable: true,
+        ),
+      );
+    });
+    });
+  });
 }
 
 class _RestorableDateRangePickerDialogTestWidget extends StatefulWidget {

packages/flutter/test/material/localizations_test.dart

@@ -121,6 +121,7 @@ void main() {
     expect(localizations.keyboardKeyScrollLock, isNotNull);
     expect(localizations.keyboardKeySelect, isNotNull);
     expect(localizations.keyboardKeySpace, isNotNull);
+    expect(localizations.currentDateLabel, isNotNull);
 
     expect(localizations.aboutListTileTitle('FOO'), isNotNull);
     expect(localizations.aboutListTileTitle('FOO'), contains('FOO'));