date_field/lib/date_field.dart
2020-07-15 18:55:02 +02:00

256 lines
7.8 KiB
Dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
/// A [FormField] that contains a [DateField].
///
/// This is a convenience widget that wraps a [DateField] widget in a
/// [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.
class DateFormField extends FormField<DateTime> {
DateFormField(
{Key key,
FormFieldSetter<DateTime> onSaved,
FormFieldValidator<DateTime> validator,
DateTime initialValue,
bool autovalidate = false,
bool enabled = true,
this.onDateSelected,
this.firstDate,
this.lastDate,
this.label = 'Select date',
this.dateFormat,
this.decoration,
this.initialDatePickerMode = DatePickerMode.day})
: super(
key: key,
initialValue: initialValue,
onSaved: onSaved,
validator: validator,
autovalidate: autovalidate,
enabled: enabled,
builder: (FormFieldState<DateTime> field) {
final _DateFormFieldState state = field;
void onChangedHandler(DateTime value) {
if (onDateSelected != null) {
onDateSelected(value);
}
field.didChange(value);
}
return DateField(
label: label,
firstDate: firstDate,
lastDate: lastDate,
decoration: decoration,
initialDatePickerMode: initialDatePickerMode,
dateFormat: dateFormat,
errorText: state.errorText,
onDateSelected: onChangedHandler,
selectedDate: state.value,
enabled: enabled,
);
},
);
/// (optional) A callback that will be triggered whenever a new
/// DateTime is selected
final ValueChanged<DateTime> onDateSelected;
/// (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;
@override
_DateFormFieldState createState() => _DateFormFieldState();
}
class _DateFormFieldState extends FormFieldState<DateTime> {}
/// [DateField]
///
/// Shows an [_InputDropdown] that'll trigger [DateField._selectDate] whenever the user
/// clicks on it ! The date picker is **platform responsive** (ios date picker style for ios, ...)
class DateField extends StatelessWidget {
/// Default constructor
const DateField({
@required this.onDateSelected,
@required this.selectedDate,
this.firstDate,
this.lastDate,
this.initialDatePickerMode = DatePickerMode.day,
this.decoration,
this.errorText,
this.dateFormat,
this.label = 'Select date',
this.enabled = true,
});
/// 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;
/// Shows a dialog asking the user to pick a date !
Future<void> _selectDate(BuildContext context) async {
if (Theme.of(context).platform == TargetPlatform.iOS) {
showModalBottomSheet<void>(
context: context,
builder: (BuildContext builder) {
return Container(
height: MediaQuery.of(context).size.height / 4,
child: CupertinoDatePicker(
mode: CupertinoDatePickerMode.date,
onDateTimeChanged: onDateSelected,
initialDateTime: selectedDate ?? lastDate ?? DateTime.now(),
minimumDate: firstDate,
maximumDate: lastDate,
),
);
},
);
} else {
final DateTime _selectedDate = await showDatePicker(
context: context,
initialDatePickerMode: initialDatePickerMode,
initialDate: selectedDate ?? lastDate ?? DateTime.now(),
firstDate: firstDate ?? DateTime(1900),
lastDate: lastDate ?? DateTime(2100));
if (_selectedDate != null) {
onDateSelected(_selectedDate);
}
}
}
@override
Widget build(BuildContext context) {
String text;
if (selectedDate != null)
text = (dateFormat ?? DateFormat.yMMMd()).format(selectedDate);
return _InputDropdown(
text: text ?? label,
label: text == null ? null : label,
errorText: errorText,
decoration: decoration,
onPressed: enabled
? () {
_selectDate(context);
}
: null,
);
}
}
///
/// [_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 !
class _InputDropdown extends StatelessWidget {
const _InputDropdown({
Key key,
@required this.text,
this.label,
this.decoration,
this.textStyle,
this.onPressed,
this.errorText,
}) : assert(text != null),
super(key: key);
/// 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);
}
final InputDecoration effectiveDecoration =
decoration?.copyWith(errorText: errorText) ??
InputDecoration(
labelText: label,
errorText: errorText,
suffixIcon: Icon(Icons.arrow_drop_down),
).applyDefaults(Theme.of(context).inputDecorationTheme);
return Material(
color: Colors.transparent,
child: InkWell(
borderRadius: inkwellBorderRadius,
onTap: onPressed,
child: InputDecorator(
decoration: effectiveDecoration,
baseStyle: textStyle,
child: Text(text, style: textStyle),
),
),
);
}
}