date_field/lib/date_field.dart

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import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
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/// A [FormField] that contains a [DateTimeField].
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///
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/// This is a convenience widget that wraps a [DateTimeField] widget in a
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/// [FormField].
///
/// A [Form] ancestor is not required. The [Form] simply makes it easier to
/// save, reset, or validate multiple fields at once. To use without a [Form],
/// pass a [GlobalKey] to the constructor and use [GlobalKey.currentState] to
/// save or reset the form field.
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class DateTimeFormField extends FormField<DateTime> {
DateTimeFormField({
Key key,
FormFieldSetter<DateTime> onSaved,
FormFieldValidator<DateTime> validator,
DateTime initialValue,
bool autovalidate = false,
bool enabled = true,
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TextStyle textStyle,
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this.onDateSelected,
this.firstDate,
this.lastDate,
this.label = 'Select date',
this.dateFormat,
this.decoration,
this.initialDatePickerMode = DatePickerMode.day,
this.mode = DateFieldPickerMode.date,
}) : super(
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key: key,
initialValue: initialValue,
onSaved: onSaved,
validator: validator,
autovalidate: autovalidate,
enabled: enabled,
builder: (FormFieldState<DateTime> field) {
final _DateFormFieldState state = field;
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void onChangedHandler(DateTime value) {
if (onDateSelected != null) {
onDateSelected(value);
}
field.didChange(value);
}
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return DateTimeField(
label: label,
firstDate: firstDate,
lastDate: lastDate,
decoration: decoration,
initialDatePickerMode: initialDatePickerMode,
dateFormat: dateFormat,
errorText: state.errorText,
onDateSelected: onChangedHandler,
selectedDate: state.value,
enabled: enabled,
mode: mode,
textStyle: textStyle,
);
},
);
/// (optional) A callback that will be triggered whenever a new
/// DateTime is selected
final ValueChanged<DateTime> onDateSelected;
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/// (optional) The first date that the user can select (default is 1900)
final DateTime firstDate;
/// (optional) The last date that the user can select (default is 2100)
final DateTime lastDate;
/// (optional) The label to display for the field (default is 'Select date')
final String label;
/// (optional) Custom [InputDecoration] for the [InputDecorator] widget
final InputDecoration decoration;
/// (optional) How to display the [DateTime] for the user (default is [DateFormat.yMMMD])
final DateFormat dateFormat;
/// (optional) Let you choose the [DatePickerMode] for the date picker! (default is [DatePickerMode.day]
final DatePickerMode initialDatePickerMode;
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/// Whether to ask the user to pick only the date, the time or both.
final DateFieldPickerMode mode;
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@override
_DateFormFieldState createState() => _DateFormFieldState();
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}
class _DateFormFieldState extends FormFieldState<DateTime> {}
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/// [DateTimeField]
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///
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/// Shows an [_InputDropdown] that'll trigger [DateTimeField._selectDate] whenever the user
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/// clicks on it ! The date picker is **platform responsive** (ios date picker style for ios, ...)
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class DateTimeField extends StatelessWidget {
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/// Default constructor
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DateTimeField({
Key key,
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@required this.onDateSelected,
@required this.selectedDate,
this.initialDatePickerMode = DatePickerMode.day,
this.decoration,
this.errorText,
this.label = 'Select date',
this.enabled = true,
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this.mode = DateFieldPickerMode.dateAndTime,
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this.textStyle,
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DateTime firstDate,
DateTime lastDate,
DateFormat dateFormat,
}) : dateFormat = dateFormat ?? getDateFormatFromDateFieldPickerMode(mode),
firstDate = firstDate ?? DateTime(1900),
lastDate = lastDate ?? DateTime(2100),
super(key: key);
DateTimeField.time({
Key key,
this.onDateSelected,
this.selectedDate,
this.label,
this.errorText,
this.decoration,
this.enabled,
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this.textStyle,
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DateTime firstDate,
DateTime lastDate,
}) : initialDatePickerMode = null,
mode = DateFieldPickerMode.time,
dateFormat = DateFormat.jm(),
firstDate = firstDate ?? DateTime(2000),
lastDate = lastDate ?? DateTime(2001),
super(key: key);
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/// Callback for whenever the user selects a [DateTime]
final ValueChanged<DateTime> onDateSelected;
/// The current selected date to display inside the field
final DateTime selectedDate;
/// (optional) The first date that the user can select (default is 1900)
final DateTime firstDate;
/// (optional) The last date that the user can select (default is 2100)
final DateTime lastDate;
/// Let you choose the [DatePickerMode] for the date picker! (default is [DatePickerMode.day]
final DatePickerMode initialDatePickerMode;
/// The label to display for the field (default is 'Select date')
final String label;
/// (optional) The error text that should be displayed under the field
final String errorText;
/// (optional) Custom [InputDecoration] for the [InputDecorator] widget
final InputDecoration decoration;
/// (optional) How to display the [DateTime] for the user (default is [DateFormat.yMMMD])
final DateFormat dateFormat;
/// (optional) Whether the field is usable. If false the user won't be able to select any date
final bool enabled;
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/// Whether to ask the user to pick only the date, the time or both.
final DateFieldPickerMode mode;
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/// TextStyle of the text inside the button.
final TextStyle textStyle;
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/// Shows a dialog asking the user to pick a date !
Future<void> _selectDate(BuildContext context) async {
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final DateTime initialDateTime = selectedDate ?? lastDate ?? DateTime.now();
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if (Theme.of(context).platform == TargetPlatform.iOS) {
showModalBottomSheet<void>(
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context: context,
builder: (BuildContext builder) {
return Container(
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height: 216,
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child: CupertinoDatePicker(
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mode: _cupertinoModeFromPickerMode(mode),
onDateTimeChanged: onDateSelected,
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initialDateTime: initialDateTime,
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minimumDate: firstDate,
maximumDate: lastDate,
),
);
},
);
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} else {
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DateTime _selectedDateTime = initialDateTime;
if ([DateFieldPickerMode.dateAndTime, DateFieldPickerMode.date]
.contains(mode)) {
final DateTime _selectedDate = await showDatePicker(
context: context,
initialDatePickerMode: initialDatePickerMode,
initialDate: initialDateTime,
firstDate: firstDate,
lastDate: lastDate);
if (_selectedDate != null) {
_selectedDateTime = _selectedDate;
}
}
if ([DateFieldPickerMode.dateAndTime, DateFieldPickerMode.time]
.contains(mode)) {
final TimeOfDay _selectedTime = await showTimePicker(
initialTime: TimeOfDay.fromDateTime(initialDateTime),
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context: context,
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);
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if (_selectedTime != null) {
_selectedDateTime = DateTime(
_selectedDateTime.year,
_selectedDateTime.month,
_selectedDateTime.day,
_selectedTime.hour,
_selectedTime.minute);
}
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}
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onDateSelected(_selectedDateTime);
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}
}
@override
Widget build(BuildContext context) {
String text;
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if (selectedDate != null) text = dateFormat.format(selectedDate);
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return _InputDropdown(
text: text ?? label,
label: text == null ? null : label,
errorText: errorText,
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textStyle: textStyle,
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decoration: decoration,
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onPressed: enabled ? () => _selectDate(context) : null,
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);
}
}
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/// Those values are used by the [DateTimeField] widget to determine whether to ask
/// the user for the time, the date or both.
enum DateFieldPickerMode { time, date, dateAndTime }
/// Returns the [CupertinoDatePickerMode] corresponding to the selected
/// [DateFieldPickerMode]. This exists to prevent redundancy in the [DateTimeField]
/// widget parameters.
CupertinoDatePickerMode _cupertinoModeFromPickerMode(DateFieldPickerMode mode) {
switch (mode) {
case DateFieldPickerMode.time:
return CupertinoDatePickerMode.time;
case DateFieldPickerMode.date:
return CupertinoDatePickerMode.date;
default:
return CupertinoDatePickerMode.dateAndTime;
}
}
/// Returns the corresponding default [DateFormat] for the selected [DateFieldPickerMode]
DateFormat getDateFormatFromDateFieldPickerMode(DateFieldPickerMode mode) {
switch (mode) {
case DateFieldPickerMode.time:
return DateFormat.jm();
case DateFieldPickerMode.date:
return DateFormat.yMMMMd();
default:
return DateFormat.yMd().add_jm();
}
}
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///
/// [_InputDropdown]
///
/// Shows a field with a dropdown arrow !
/// It does not show any popup menu, it'll just trigger onPressed whenever the
/// user does click on it !
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class _InputDropdown extends StatelessWidget {
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const _InputDropdown({
Key key,
@required this.text,
this.label,
this.decoration,
this.textStyle,
this.onPressed,
this.errorText,
}) : assert(text != null),
super(key: key);
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/// The label to display for the field (default is 'Select date')
final String label;
/// The text that should be displayed inside the field
final String text;
/// (optional) The error text that should be displayed under the field
final String errorText;
/// (optional) Custom [InputDecoration] for the [InputDecorator] widget
final InputDecoration decoration;
/// TextStyle for the field
final TextStyle textStyle;
/// Callbacks triggered whenever the user presses on the field!
final VoidCallback onPressed;
@override
Widget build(BuildContext context) {
BorderRadius inkwellBorderRadius;
if (decoration?.border?.runtimeType == OutlineInputBorder) {
inkwellBorderRadius = BorderRadius.circular(8);
}
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final InputDecoration effectiveDecoration =
decoration?.copyWith(errorText: errorText) ??
InputDecoration(
labelText: label,
errorText: errorText,
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suffixIcon: const Icon(Icons.arrow_drop_down),
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).applyDefaults(Theme.of(context).inputDecorationTheme);
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return Material(
color: Colors.transparent,
child: InkWell(
borderRadius: inkwellBorderRadius,
onTap: onPressed,
child: InputDecorator(
decoration: effectiveDecoration,
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baseStyle: textStyle,
child: Text(text, style: textStyle),
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),
),
);
}
}