import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; import 'package:intl/intl.dart'; /// 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, bool autovalidate = false, bool enabled = true, TextStyle textStyle, this.onDateSelected, this.firstDate, this.lastDate, this.label = 'Select date', this.dateFormat, this.decoration, this.initialDatePickerMode = DatePickerMode.day, this.mode = DateFieldPickerMode.date, }) : super( key: key, initialValue: initialValue, onSaved: onSaved, validator: validator, autovalidate: autovalidate, enabled: enabled, builder: (FormFieldState field) { final _DateFormFieldState state = field; void onChangedHandler(DateTime value) { if (onDateSelected != null) { onDateSelected(value); } field.didChange(value); } 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 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; /// Whether to ask the user to pick only the date, the time or both. final DateFieldPickerMode mode; @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 { /// Default constructor DateTimeField({ Key key, @required this.onDateSelected, @required this.selectedDate, this.initialDatePickerMode = DatePickerMode.day, this.decoration, this.errorText, this.label = 'Select date', this.enabled = true, this.mode = DateFieldPickerMode.dateAndTime, this.textStyle, 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, this.textStyle, DateTime firstDate, DateTime lastDate, }) : initialDatePickerMode = null, mode = DateFieldPickerMode.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; /// (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; /// Whether to ask the user to pick only the date, the time or both. final DateFieldPickerMode mode; /// TextStyle of the text inside the button. final TextStyle textStyle; /// Shows a dialog asking the user to pick a date ! Future _selectDate(BuildContext context) async { final DateTime initialDateTime = selectedDate ?? lastDate ?? DateTime.now(); if (Theme.of(context).platform == TargetPlatform.iOS) { showModalBottomSheet( context: context, builder: (BuildContext builder) { return Container( height: 216, child: CupertinoDatePicker( mode: _cupertinoModeFromPickerMode(mode), onDateTimeChanged: onDateSelected, initialDateTime: initialDateTime, minimumDate: firstDate, maximumDate: lastDate, ), ); }, ); } else { 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), 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); return _InputDropdown( text: text ?? label, errorText: errorText, textStyle: textStyle, decoration: decoration, 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 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(); } } /// /// [_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, this.errorText, }) : assert(text != null), super(key: key); /// 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( errorText: errorText, suffixIcon: const 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), ), ), ); } }