import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; import 'package:intl/intl.dart'; final DateTime _kDefaultFirstSelectableDate = DateTime(1900); final DateTime _kDefaultLastSelectableDate = DateTime(2100); const double _kCupertinoDatePickerHeight = 216; /// A [FormField] that contains a [DateTimeField]. /// /// This is a convenience widget that wraps a [DateTimeField] 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 DateTimeFormField extends FormField { DateTimeFormField({ Key key, FormFieldSetter onSaved, FormFieldValidator validator, DateTime initialValue, AutovalidateMode autovalidateMode, bool enabled = true, TextStyle dateTextStyle, DateFormat dateFormat, DateTime firstDate, DateTime lastDate, ValueChanged onDateSelected, InputDecoration decoration, DatePickerMode initialDatePickerMode = DatePickerMode.day, DateTimeFieldPickerMode mode = DateTimeFieldPickerMode.dateAndTime, }) : super( key: key, initialValue: initialValue, onSaved: onSaved, validator: validator, autovalidateMode: autovalidateMode, enabled: enabled, builder: (FormFieldState field) { final _DateFormFieldState state = field; // Theme defaults are applied inside the _InputDropdown widget final InputDecoration _decorationWithThemeDefaults = decoration ?? const InputDecoration(); final InputDecoration effectiveDecoration = _decorationWithThemeDefaults.copyWith( errorText: field.errorText); void onChangedHandler(DateTime value) { if (onDateSelected != null) { onDateSelected(value); } field.didChange(value); } return DateTimeField( firstDate: firstDate, lastDate: lastDate, decoration: effectiveDecoration, initialDatePickerMode: initialDatePickerMode, dateFormat: dateFormat, onDateSelected: onChangedHandler, selectedDate: state.value, enabled: enabled, mode: mode, dateTextStyle: dateTextStyle, ); }, ); @override _DateFormFieldState createState() => _DateFormFieldState(); } class _DateFormFieldState extends FormFieldState {} /// [DateTimeField] /// /// Shows an [_InputDropdown] that'll trigger [DateTimeField._selectDate] whenever the user /// clicks on it ! The date picker is **platform responsive** (ios date picker style for ios, ...) class DateTimeField extends StatelessWidget { DateTimeField({ Key key, @required this.onDateSelected, @required this.selectedDate, this.initialDatePickerMode = DatePickerMode.day, this.decoration, this.enabled = true, this.mode = DateTimeFieldPickerMode.dateAndTime, this.dateTextStyle, DateTime firstDate, DateTime lastDate, DateFormat dateFormat, }) : dateFormat = dateFormat ?? getDateFormatFromDateFieldPickerMode(mode), firstDate = firstDate ?? _kDefaultFirstSelectableDate, lastDate = lastDate ?? _kDefaultLastSelectableDate, super(key: key); DateTimeField.time({ Key key, this.onDateSelected, this.selectedDate, this.decoration, this.enabled, this.dateTextStyle, DateTime firstDate, DateTime lastDate, }) : initialDatePickerMode = null, mode = DateTimeFieldPickerMode.time, dateFormat = DateFormat.jm(), firstDate = firstDate ?? DateTime(2000), lastDate = lastDate ?? DateTime(2001), super(key: key); /// Callback for whenever the user selects a [DateTime] final ValueChanged onDateSelected; /// The current selected date to display inside the field final DateTime selectedDate; /// The first date that the user can select (default is 1900) final DateTime firstDate; /// 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; /// Custom [InputDecoration] for the [InputDecorator] widget final InputDecoration decoration; /// How to display the [DateTime] for the user (default is [DateFormat.yMMMD]) final DateFormat dateFormat; /// Whether the field is usable. If false the user won't be able to select any date final bool enabled; /// Whether to ask the user to pick only the date, the time or both. final DateTimeFieldPickerMode mode; /// [TextStyle] of the selected date inside the field. final TextStyle dateTextStyle; /// Shows a dialog asking the user to pick a date ! Future _selectDate(BuildContext context) async { final DateTime initialDateTime = selectedDate ?? DateTime.now(); if (Theme.of(context).platform == TargetPlatform.iOS) { showModalBottomSheet( context: context, builder: (BuildContext builder) { return Container( height: _kCupertinoDatePickerHeight, child: CupertinoDatePicker( mode: _cupertinoModeFromPickerMode(mode), onDateTimeChanged: onDateSelected, initialDateTime: initialDateTime, minimumDate: firstDate, maximumDate: lastDate, ), ); }, ); } else { DateTime _selectedDateTime = initialDateTime; if ([DateTimeFieldPickerMode.dateAndTime, DateTimeFieldPickerMode.date] .contains(mode)) { final DateTime _selectedDate = await showDatePicker( context: context, initialDatePickerMode: initialDatePickerMode, initialDate: initialDateTime, firstDate: firstDate, lastDate: lastDate, ); if (_selectedDate != null) { _selectedDateTime = _selectedDate; } else { return; } } if ([DateTimeFieldPickerMode.dateAndTime, DateTimeFieldPickerMode.time] .contains(mode)) { final TimeOfDay _selectedTime = await showTimePicker( initialTime: TimeOfDay.fromDateTime(initialDateTime), context: context, ); if (_selectedTime != null) { _selectedDateTime = DateTime( _selectedDateTime.year, _selectedDateTime.month, _selectedDateTime.day, _selectedTime.hour, _selectedTime.minute); } } onDateSelected(_selectedDateTime); } } @override Widget build(BuildContext context) { String text; if (selectedDate != null) text = dateFormat.format(selectedDate); TextStyle textStyle; if (text == null) { textStyle = decoration.hintStyle ?? Theme.of(context).inputDecorationTheme.hintStyle; } else { textStyle = dateTextStyle ?? dateTextStyle; } final bool shouldDisplayLabelText = (text ?? decoration.hintText) != null; InputDecoration effectiveDecoration = decoration; if (!shouldDisplayLabelText) { effectiveDecoration = effectiveDecoration.copyWith(labelText: ''); } return _InputDropdown( text: text ?? decoration.hintText ?? decoration.labelText ?? 'Select date', textStyle: textStyle, decoration: effectiveDecoration, onPressed: enabled ? () => _selectDate(context) : null, ); } } /// Those values are used by the [DateTimeField] widget to determine whether to ask /// the user for the time, the date or both. enum DateTimeFieldPickerMode { time, date, dateAndTime } /// Returns the [CupertinoDatePickerMode] corresponding to the selected /// [DateTimeFieldPickerMode]. This exists to prevent redundancy in the [DateTimeField] /// widget parameters. CupertinoDatePickerMode _cupertinoModeFromPickerMode( DateTimeFieldPickerMode mode) { switch (mode) { case DateTimeFieldPickerMode.time: return CupertinoDatePickerMode.time; case DateTimeFieldPickerMode.date: return CupertinoDatePickerMode.date; default: return CupertinoDatePickerMode.dateAndTime; } } /// Returns the corresponding default [DateFormat] for the selected [DateTimeFieldPickerMode] DateFormat getDateFormatFromDateFieldPickerMode(DateTimeFieldPickerMode mode) { switch (mode) { case DateTimeFieldPickerMode.time: return DateFormat.jm(); case DateTimeFieldPickerMode.date: return DateFormat.yMMMMd(); default: return DateFormat.yMd().add_jm(); } } /// /// [_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.decoration, this.textStyle, this.onPressed, }) : assert(text != null), super(key: key); /// The text that should be displayed inside the field final String text; /// 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 ?? const InputDecoration( suffixIcon: const Icon(Icons.arrow_drop_down), ).applyDefaults(Theme.of(context).inputDecorationTheme); return GestureDetector( onTap: onPressed, child: InputDecorator( decoration: effectiveDecoration, child: Text(text, style: textStyle), ), ); } }