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