build method

Future<DateTime?> build(BuildContext context, DateTime? currentDateTime)

Build the picker.

context is passed BuildContext. currentDateTime is passed the currently selected DateTime.

ピッカーのビルドを行ないます。

contextにBuildContextが渡されます。currentDateTimeに現在選択されているDateTimeが渡されます。

Implementation

Future<DateTime?> build(
  BuildContext context,
  DateTime? currentDateTime,
) async {
  final theme = Theme.of(context);
  DateTime? res;
  await _Picker(
    height: 240,
    backgroundColor: backgroundColor ?? theme.colorScheme.surface,
    containerColor: backgroundColor ?? theme.colorScheme.surface,
    headerColor: backgroundColor ?? theme.colorScheme.surface,
    textStyle: TextStyle(color: color ?? theme.colorScheme.onSurface),
    confirmText: confirmText,
    cancelText: cancelText,
    selecteds: [
      (currentDateTime?.month ?? defaultDateTime?.month ?? 1) - 1,
      (currentDateTime?.day ?? defaultDateTime?.day ?? 1) - 1,
    ],
    adapter: _PickerDataAdapter<int>(
      data: [
        ...List.generate(12, (m) {
          final month = DateTime(1970, m + 2, 0);
          return _PickerItem(
            text: Text(
              "${month.format(monthFormat)}$monthSuffix",
              style: TextStyle(
                color: color ?? theme.colorScheme.onSurface,
              ),
            ),
            value: m + 1,
            children: List.generate(
              month.day,
              (d) => _PickerItem(
                text: Text(
                  "${(d + 1).format("00")}$daySuffix",
                  style: TextStyle(
                    color: color ?? theme.colorScheme.onSurface,
                  ),
                ),
                value: d + 1,
              ),
            ),
          );
        }),
      ],
    ),
    changeToFirst: true,
    hideHeader: false,
    onConfirm: (_Picker picker, List<int> value) {
      final now = DateTime.now();
      res = DateTime(now.year, value[0] + 1, value[1] + 1);
    },
  ).showModal(context);
  return res;
}