ConstrainedBox(
  constraints: const BoxConstraints(maxWidth: 600),
  child: const ShadDatePicker(),
)

ConstrainedBox(
  constraints: const BoxConstraints(maxWidth: 600),
  child: const ShadDatePicker.range(),
)

ShadDatePicker(
  groupId: groupId,
  header: Padding(
    padding: const EdgeInsets.only(bottom: 4),
    child: ShadSelect<int>(
      groupId: groupId,
      minWidth: 276,
      placeholder: const Text('Select'),
      options: presets.entries
          .map((e) => ShadOption(value: e.key, child: Text(e.value)))
          .toList(),
      selectedOptionBuilder: (context, value) => Text(presets[value]!),
      onChanged: (value) {
        if (value == null) return;
        setState(() => selected = today.add(Duration(days: value)));
      },
    ),
  ),
  selected: selected,
  calendarDecoration: theme.calendarTheme.decoration,
  popoverPadding: const EdgeInsets.all(4),
)

ShadDatePickerFormField(
  label: const Text('Date of birth'),
  onChanged: print,
  description: const Text('Your date of birth is used to calculate your age.'),
  validator: (v) {
    if (v == null) return 'A date of birth is required.';
    return null;
  },
)

ShadDateRangePickerFormField(
  label: const Text('Range of dates'),
  onChanged: print,
  description: const Text('Select the range of dates you want to search between.'),
  validator: (v) {
    if (v == null) return 'A range of dates is required.';
    if (v.start == null) return 'The start date is required.';
    if (v.end == null) return 'The end date is required.';
    return null;
  },
)