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com.unity.uiwidgets/com.unity.uiwidgets/Runtime/cupertino/date_picker.cs

2704 行
115 KiB
原始文件 文件历史

using System;
using System.Collections.Generic;
using Unity.UIWidgets.animation;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.rendering;
using Unity.UIWidgets.scheduler2;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
using TextStyle = Unity.UIWidgets.painting.TextStyle;
namespace Unity.UIWidgets.cupertino {
static class CupertinoDatePickerUtils {
public const float _kItemExtent = 32.0f;
public const float _kPickerWidth = 330.0f;
public const bool _kUseMagnifier = true;
public const float _kMagnification = 1.05f;
public const float _kDatePickerPadSize = 12.0f;
public static Color _kBackgroundColor = CupertinoColors.white;
public static TextStyle _kDefaultPickerTextStyle = new TextStyle(
letterSpacing: -0.83f
);
public delegate Widget listGenerateDelegate(int index);
public static List<Widget> listGenerate(int count, listGenerateDelegate func) {
var list = new List<Widget>();
for (int i = 0; i < count; i++) {
list.Add(func(i));
}
return list;
}
}
public class _DatePickerLayoutDelegate : MultiChildLayoutDelegate {
public _DatePickerLayoutDelegate(
List<float> columnWidths
) {
D.assert(columnWidths != null);
this.columnWidths = columnWidths;
}
public readonly List<float> columnWidths;
public override void performLayout(Size size) {
float remainingWidth = size.width;
for (int i = 0; i < columnWidths.Count; i++) {
remainingWidth -= columnWidths[i] + CupertinoDatePickerUtils._kDatePickerPadSize * 2;
}
float currentHorizontalOffset = 0.0f;
for (int i = 0; i < columnWidths.Count; i++) {
float childWidth = columnWidths[i] + CupertinoDatePickerUtils._kDatePickerPadSize * 2;
if (i == 0 || i == columnWidths.Count - 1) {
childWidth += remainingWidth / 2;
}
layoutChild(i, BoxConstraints.tight(new Size(childWidth, size.height)));
positionChild(i, new Offset(currentHorizontalOffset, 0.0f));
currentHorizontalOffset += childWidth;
}
}
public override bool shouldRelayout(MultiChildLayoutDelegate oldDelegate) {
return columnWidths != ((_DatePickerLayoutDelegate) oldDelegate).columnWidths;
}
}
public enum CupertinoDatePickerMode {
time,
date,
dateAndTime,
}
enum _PickerColumnType {
dayOfMonth,
month,
year,
date,
hour,
minute,
dayPeriod,
}
public class CupertinoDatePicker : StatefulWidget {
public CupertinoDatePicker(
ValueChanged<DateTime> onDateTimeChanged,
CupertinoDatePickerMode mode = CupertinoDatePickerMode.dateAndTime,
DateTime? initialDateTime = null,
DateTime? minimumDate = null,
DateTime? maximumDate = null,
int minimumYear = 1,
int? maximumYear = null,
int minuteInterval = 1,
bool use24hFormat = false
) {
this.initialDateTime = initialDateTime ?? DateTime.Now;
D.assert(onDateTimeChanged != null);
D.assert(
minuteInterval > 0 && 60 % minuteInterval == 0,
() => "minute interval is not a positive integer factor of 60"
);
D.assert(this.initialDateTime != null);
D.assert(
mode != CupertinoDatePickerMode.dateAndTime || minimumDate == null ||
!(this.initialDateTime < minimumDate),
() => "initial date is before minimum date"
);
D.assert(
mode != CupertinoDatePickerMode.dateAndTime || maximumDate == null ||
!(this.initialDateTime > maximumDate),
() => "initial date is after maximum date"
);
D.assert(
mode != CupertinoDatePickerMode.date || (minimumYear >= 1 && this.initialDateTime.Year >= minimumYear),
() => "initial year is not greater than minimum year, or mininum year is not positive"
);
D.assert(
mode != CupertinoDatePickerMode.date || maximumYear == null || this.initialDateTime.Year <= maximumYear,
() => "initial year is not smaller than maximum year"
);
D.assert(
this.initialDateTime.Minute % minuteInterval == 0,
() => "initial minute is not divisible by minute interval"
);
this.onDateTimeChanged = onDateTimeChanged;
this.mode = mode;
this.minimumDate = minimumDate;
this.maximumDate = maximumDate;
this.minimumYear = minimumYear;
this.maximumYear = maximumYear;
this.minuteInterval = minuteInterval;
this.use24hFormat = use24hFormat;
}
public readonly CupertinoDatePickerMode mode;
public readonly DateTime initialDateTime;
public readonly DateTime? minimumDate;
public readonly DateTime? maximumDate;
public readonly int minimumYear;
public readonly int? maximumYear;
public readonly int minuteInterval;
public readonly bool use24hFormat;
public readonly ValueChanged<DateTime> onDateTimeChanged;
public override State createState() {
if (mode == CupertinoDatePickerMode.time || mode == CupertinoDatePickerMode.dateAndTime) {
return new _CupertinoDatePickerDateTimeState();
}
else {
return new _CupertinoDatePickerDateState();
}
}
internal static float _getColumnWidth(
_PickerColumnType columnType,
CupertinoLocalizations localizations,
BuildContext context
) {
string longestText = "";
switch (columnType) {
case _PickerColumnType.date:
for (int i = 1; i <= 12; i++) {
string date =
localizations.datePickerMediumDate(new DateTime(2018, i, 25));
if (longestText.Length < date.Length) {
longestText = date;
}
}
break;
case _PickerColumnType.hour:
for (int i = 0; i < 24; i++) {
string hour = localizations.datePickerHour(i);
if (longestText.Length < hour.Length) {
longestText = hour;
}
}
break;
case _PickerColumnType.minute:
for (int i = 0; i < 60; i++) {
string minute = localizations.datePickerMinute(i);
if (longestText.Length < minute.Length) {
longestText = minute;
}
}
break;
case _PickerColumnType.dayPeriod:
longestText =
localizations.anteMeridiemAbbreviation.Length > localizations.postMeridiemAbbreviation.Length
? localizations.anteMeridiemAbbreviation
: localizations.postMeridiemAbbreviation;
break;
case _PickerColumnType.dayOfMonth:
for (int i = 1; i <= 31; i++) {
string dayOfMonth = localizations.datePickerDayOfMonth(i);
if (longestText.Length < dayOfMonth.Length) {
longestText = dayOfMonth;
}
}
break;
case _PickerColumnType.month:
for (int i = 1; i <= 12; i++) {
string month = localizations.datePickerMonth(i);
if (longestText.Length < month.Length) {
longestText = month;
}
}
break;
case _PickerColumnType.year:
longestText = localizations.datePickerYear(2018);
break;
}
D.assert(longestText != "", () => "column type is not appropriate");
TextPainter painter = new TextPainter(
text: new TextSpan(
style: DefaultTextStyle.of(context).style,
text: longestText
)
);
painter.layout();
return painter.maxIntrinsicWidth;
}
}
delegate Widget _ColumnBuilder(float offAxisFraction, TransitionBuilder itemPositioningBuilder);
class _CupertinoDatePickerDateTimeState : State<CupertinoDatePicker> {
public CupertinoLocalizations localizations;
public Alignment alignCenterLeft;
public Alignment alignCenterRight;
public DateTime initialDateTime;
public int selectedDayFromInitial;
public int selectedHour;
public int previousHourIndex;
public int selectedMinute;
public int selectedAmPm;
public FixedExtentScrollController amPmController;
public static Dictionary<int, float> estimatedColumnWidths = new Dictionary<int, float>();
public override void initState() {
base.initState();
initialDateTime = widget.initialDateTime;
selectedDayFromInitial = 0;
selectedHour = widget.initialDateTime.Hour;
selectedMinute = widget.initialDateTime.Minute;
selectedAmPm = 0;
if (!widget.use24hFormat) {
selectedAmPm = selectedHour / 12;
selectedHour = selectedHour % 12;
if (selectedHour == 0) {
selectedHour = 12;
}
amPmController = new FixedExtentScrollController(initialItem: selectedAmPm);
}
previousHourIndex = selectedHour;
}
public override void didUpdateWidget(StatefulWidget oldWidget) {
base.didUpdateWidget(oldWidget);
D.assert(
((CupertinoDatePicker) oldWidget).mode == widget.mode,
() => "The CupertinoDatePicker's mode cannot change once it's built"
);
}
public override void didChangeDependencies() {
base.didChangeDependencies();
localizations = CupertinoLocalizations.of(context);
alignCenterLeft = Alignment.centerLeft;
alignCenterRight = Alignment.centerRight;
estimatedColumnWidths.Clear();
}
float _getEstimatedColumnWidth(_PickerColumnType columnType) {
if (!estimatedColumnWidths.TryGetValue((int) columnType, out float _)) {
estimatedColumnWidths[(int) columnType] =
CupertinoDatePicker._getColumnWidth(columnType, localizations, context);
}
return estimatedColumnWidths[(int) columnType];
}
DateTime _getDateTime() {
DateTime date = new DateTime(initialDateTime.Year, initialDateTime.Month, initialDateTime.Day
).Add(new TimeSpan(selectedDayFromInitial, 0, 0, 0));
return new DateTime(
date.Year,
date.Month,
date.Day,
widget.use24hFormat ? selectedHour : selectedHour % 12 + selectedAmPm * 12,
selectedMinute,
0
);
}
Widget _buildMediumDatePicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
return CupertinoPicker.builder(
scrollController: new FixedExtentScrollController(initialItem: selectedDayFromInitial),
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: CupertinoDatePickerUtils._kBackgroundColor,
onSelectedItemChanged: (int index) => {
selectedDayFromInitial = index;
widget.onDateTimeChanged(_getDateTime());
},
itemBuilder: (BuildContext context, int index) => {
DateTime dateTime = new DateTime(initialDateTime.Year, initialDateTime.Month,
initialDateTime.Day
).Add(new TimeSpan(index, 0, 0, 0));
if (widget.minimumDate != null && dateTime < widget.minimumDate) {
return null;
}
if (widget.maximumDate != null && dateTime > widget.maximumDate) {
return null;
}
return itemPositioningBuilder(
context,
new Text(localizations.datePickerMediumDate(dateTime))
);
}
);
}
Widget _buildHourPicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
return new CupertinoPicker(
scrollController: new FixedExtentScrollController(initialItem: selectedHour),
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: CupertinoDatePickerUtils._kBackgroundColor,
onSelectedItemChanged: (int index) => {
if (widget.use24hFormat) {
selectedHour = index;
widget.onDateTimeChanged(_getDateTime());
}
else {
selectedHour = index % 12;
bool wasAm = previousHourIndex >= 0 && previousHourIndex <= 11;
bool isAm = index >= 0 && index <= 11;
if (wasAm != isAm) {
amPmController.animateToItem(
1 - amPmController.selectedItem,
duration: new TimeSpan(0, 0, 0, 0, 300),
curve:
Curves.easeOut
);
}
else {
widget.onDateTimeChanged(_getDateTime());
}
}
previousHourIndex = index;
},
children: CupertinoDatePickerUtils.listGenerate(24, (index) => {
int hour = index;
if (!widget.use24hFormat) {
hour = hour % 12 == 0 ? 12 : hour % 12;
}
return itemPositioningBuilder(context,
new Text(localizations.datePickerHour(hour)
)
);
}),
looping: true
);
}
Widget _buildMinutePicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
return new CupertinoPicker(
scrollController: new FixedExtentScrollController(
initialItem: selectedMinute / widget.minuteInterval),
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: CupertinoDatePickerUtils._kBackgroundColor,
onSelectedItemChanged: (int index) => {
selectedMinute = index * widget.minuteInterval;
widget.onDateTimeChanged(_getDateTime());
},
children: CupertinoDatePickerUtils.listGenerate(60 / widget.minuteInterval, (int index) => {
int minute = index * widget.minuteInterval;
return itemPositioningBuilder(context,
new Text(localizations.datePickerMinute(minute)
)
);
}),
looping: true
);
}
Widget _buildAmPmPicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
return new CupertinoPicker(
scrollController: amPmController,
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: CupertinoDatePickerUtils._kBackgroundColor,
onSelectedItemChanged: (int index) => {
selectedAmPm = index;
widget.onDateTimeChanged(_getDateTime());
},
children: CupertinoDatePickerUtils.listGenerate(2, (int index) => {
return itemPositioningBuilder(context,
new Text(
index == 0
? localizations.anteMeridiemAbbreviation
: localizations.postMeridiemAbbreviation
)
);
})
);
}
public override Widget build(BuildContext context) {
List<float> columnWidths = new List<float>() {
_getEstimatedColumnWidth(_PickerColumnType.hour),
_getEstimatedColumnWidth(_PickerColumnType.minute),
};
List<_ColumnBuilder> pickerBuilders = new List<_ColumnBuilder> {
_buildHourPicker, _buildMinutePicker,
};
if (!widget.use24hFormat) {
if (localizations.datePickerDateTimeOrder == DatePickerDateTimeOrder.date_time_dayPeriod
|| localizations.datePickerDateTimeOrder == DatePickerDateTimeOrder.time_dayPeriod_date) {
pickerBuilders.Add(_buildAmPmPicker);
columnWidths.Add(_getEstimatedColumnWidth(_PickerColumnType.dayPeriod));
}
else {
pickerBuilders.Insert(0, _buildAmPmPicker);
columnWidths.Insert(0, _getEstimatedColumnWidth(_PickerColumnType.dayPeriod));
}
}
if (widget.mode == CupertinoDatePickerMode.dateAndTime) {
if (localizations.datePickerDateTimeOrder == DatePickerDateTimeOrder.time_dayPeriod_date
|| localizations.datePickerDateTimeOrder == DatePickerDateTimeOrder.dayPeriod_time_date) {
pickerBuilders.Add(_buildMediumDatePicker);
columnWidths.Add(_getEstimatedColumnWidth(_PickerColumnType.date));
}
else {
pickerBuilders.Insert(0, _buildMediumDatePicker);
columnWidths.Insert(0, _getEstimatedColumnWidth(_PickerColumnType.date));
}
}
List<Widget> pickers = new List<Widget>();
for (int i = 0; i < columnWidths.Count; i++) {
var _i = i;
float offAxisFraction = 0.0f;
if (_i == 0) {
offAxisFraction = -0.5f;
}
else if (_i >= 2 || columnWidths.Count == 2) {
offAxisFraction = 0.5f;
}
EdgeInsets padding = EdgeInsets.only(right: CupertinoDatePickerUtils._kDatePickerPadSize);
if (_i == columnWidths.Count - 1) {
padding = padding.flipped;
}
pickers.Add(new LayoutId(
id: _i,
child: pickerBuilders[_i](
offAxisFraction,
(BuildContext _context, Widget child) => {
return new Container(
alignment: _i == columnWidths.Count - 1
? alignCenterLeft
: alignCenterRight,
padding: padding,
child: new Container(
alignment: _i == columnWidths.Count - 1
? alignCenterLeft
: alignCenterRight,
width: _i == 0 || _i == columnWidths.Count - 1
? (float?) null
: columnWidths[_i] + CupertinoDatePickerUtils._kDatePickerPadSize,
child: child
)
);
}
)
));
}
return new MediaQuery(
data: new MediaQueryData(textScaleFactor: 1.0f),
child: DefaultTextStyle.merge(
style: CupertinoDatePickerUtils._kDefaultPickerTextStyle,
child: new CustomMultiChildLayout(
layoutDelegate: new _DatePickerLayoutDelegate(
columnWidths: columnWidths
),
children: pickers
)
)
);
}
}
class _CupertinoDatePickerDateState : State<CupertinoDatePicker> {
CupertinoLocalizations localizations;
Alignment alignCenterLeft;
Alignment alignCenterRight;
int selectedDay;
int selectedMonth;
int selectedYear;
FixedExtentScrollController dayController;
Dictionary<int, float> estimatedColumnWidths = new Dictionary<int, float>();
public override void initState() {
base.initState();
selectedDay = widget.initialDateTime.Day;
selectedMonth = widget.initialDateTime.Month;
selectedYear = widget.initialDateTime.Year;
dayController = new FixedExtentScrollController(initialItem: selectedDay - 1);
}
public override void didChangeDependencies() {
base.didChangeDependencies();
localizations = CupertinoLocalizations.of(context);
alignCenterLeft = Alignment.centerLeft;
alignCenterRight = Alignment.centerRight;
estimatedColumnWidths[(int) _PickerColumnType.dayOfMonth] = CupertinoDatePicker._getColumnWidth(
_PickerColumnType.dayOfMonth, localizations, context);
estimatedColumnWidths[(int) _PickerColumnType.month] = CupertinoDatePicker._getColumnWidth(
_PickerColumnType.month, localizations, context);
estimatedColumnWidths[(int) _PickerColumnType.year] = CupertinoDatePicker._getColumnWidth(
_PickerColumnType.year, localizations, context);
}
Widget _buildDayPicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
int daysInCurrentMonth = DateTime.DaysInMonth(selectedYear, selectedMonth);
return new CupertinoPicker(
scrollController: dayController,
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: CupertinoDatePickerUtils._kBackgroundColor,
onSelectedItemChanged: (int index) => {
selectedDay = index + 1;
var validDay = selectedDay;
if (DateTime.DaysInMonth(selectedYear, selectedMonth) < selectedDay) {
validDay -= DateTime.DaysInMonth(selectedYear, selectedMonth);
}
if (selectedDay == validDay) {
widget.onDateTimeChanged(new DateTime(selectedYear, selectedMonth,
selectedDay));
}
},
children: CupertinoDatePickerUtils.listGenerate(31, (int index) => {
TextStyle disableTextStyle = null;
if (index >= daysInCurrentMonth) {
disableTextStyle = new TextStyle(color: CupertinoColors.inactiveGray);
}
return itemPositioningBuilder(context,
new Text(localizations.datePickerDayOfMonth(index + 1),
style: disableTextStyle
)
);
}),
looping: true
);
}
Widget _buildMonthPicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
return new CupertinoPicker(
scrollController: new FixedExtentScrollController(initialItem: selectedMonth - 1),
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: CupertinoDatePickerUtils._kBackgroundColor,
onSelectedItemChanged: (int index) => {
selectedMonth = index + 1;
var validDay = selectedDay;
if (DateTime.DaysInMonth(selectedYear, selectedMonth) < selectedDay) {
validDay -= DateTime.DaysInMonth(selectedYear, selectedMonth);
}
if (selectedDay == validDay) {
widget.onDateTimeChanged(new DateTime(selectedYear, selectedMonth,
selectedDay));
}
},
children: CupertinoDatePickerUtils.listGenerate(12, (int index) => {
return itemPositioningBuilder(context,
new Text(localizations.datePickerMonth(index + 1))
);
}),
looping: true
);
}
Widget _buildYearPicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
return CupertinoPicker.builder(
scrollController: new FixedExtentScrollController(initialItem: selectedYear),
itemExtent: CupertinoDatePickerUtils._kItemExtent,
offAxisFraction: offAxisFraction,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: CupertinoDatePickerUtils._kBackgroundColor,
onSelectedItemChanged: (int index) => {
selectedYear = index;
if (new DateTime(selectedYear, selectedMonth, selectedDay).Day == selectedDay) {
widget.onDateTimeChanged(new DateTime(selectedYear, selectedMonth,
selectedDay));
}
},
itemBuilder: (BuildContext context, int index) => {
if (index < widget.minimumYear) {
return null;
}
if (widget.maximumYear != null && index > widget.maximumYear) {
return null;
}
return itemPositioningBuilder(
context,
new Text(localizations.datePickerYear(index))
);
}
);
}
bool _keepInValidRange(ScrollEndNotification notification) {
var desiredDay = selectedDay;
if (DateTime.DaysInMonth(selectedYear, selectedMonth) < selectedDay) {
desiredDay -= DateTime.DaysInMonth(selectedYear, selectedMonth);
}
if (desiredDay != selectedDay) {
SchedulerBinding.instance.addPostFrameCallback((TimeSpan timestamp) => {
dayController.animateToItem(dayController.selectedItem - desiredDay,
duration: new TimeSpan(0, 0, 0, 0, 200),
curve:
Curves.easeOut
);
});
}
setState(() => { });
return false;
}
public override Widget build(BuildContext context) {
List<_ColumnBuilder> pickerBuilders = new List<_ColumnBuilder>();
List<float> columnWidths = new List<float>();
switch (localizations.datePickerDateOrder) {
case DatePickerDateOrder.mdy:
pickerBuilders = new List<_ColumnBuilder>()
{_buildMonthPicker, _buildDayPicker, _buildYearPicker};
columnWidths = new List<float>() {
estimatedColumnWidths[(int) _PickerColumnType.month],
estimatedColumnWidths[(int) _PickerColumnType.dayOfMonth],
estimatedColumnWidths[(int) _PickerColumnType.year]
};
break;
case DatePickerDateOrder.dmy:
pickerBuilders = new List<_ColumnBuilder>
{_buildDayPicker, _buildMonthPicker, _buildYearPicker};
columnWidths = new List<float> {
estimatedColumnWidths[(int) _PickerColumnType.dayOfMonth],
estimatedColumnWidths[(int) _PickerColumnType.month],
estimatedColumnWidths[(int) _PickerColumnType.year]
};
break;
case DatePickerDateOrder.ymd:
pickerBuilders = new List<_ColumnBuilder>
{_buildYearPicker, _buildMonthPicker, _buildDayPicker};
columnWidths = new List<float>() {
estimatedColumnWidths[(int) _PickerColumnType.year],
estimatedColumnWidths[(int) _PickerColumnType.month],
estimatedColumnWidths[(int) _PickerColumnType.dayOfMonth]
};
break;
case DatePickerDateOrder.ydm:
pickerBuilders = new List<_ColumnBuilder>
{_buildYearPicker, _buildDayPicker, _buildMonthPicker};
columnWidths = new List<float> {
estimatedColumnWidths[(int) _PickerColumnType.year],
estimatedColumnWidths[(int) _PickerColumnType.dayOfMonth],
estimatedColumnWidths[(int) _PickerColumnType.month]
};
break;
default:
D.assert(false, () => "date order is not specified");
break;
}
List<Widget> pickers = new List<Widget>();
for (int i = 0; i < columnWidths.Count; i++) {
var _i = i;
float offAxisFraction = (_i - 1) * 0.3f;
EdgeInsets padding = EdgeInsets.only(right: CupertinoDatePickerUtils._kDatePickerPadSize);
pickers.Add(new LayoutId(
id: _i,
child: pickerBuilders[_i](
offAxisFraction,
(BuildContext _context, Widget child) => {
return new Container(
alignment: _i == columnWidths.Count - 1
? alignCenterLeft
: alignCenterRight,
padding: _i == 0 ? null : padding,
child: new Container(
alignment: _i == 0 ? alignCenterLeft : alignCenterRight,
width: columnWidths[_i] + CupertinoDatePickerUtils._kDatePickerPadSize,
child: child
)
);
}
)
));
}
return new MediaQuery(
data: new MediaQueryData(textScaleFactor: 1.0f),
child: new NotificationListener<ScrollEndNotification>(
onNotification: _keepInValidRange,
child: DefaultTextStyle.merge(
style: CupertinoDatePickerUtils._kDefaultPickerTextStyle,
child: new CustomMultiChildLayout(
layoutDelegate: new _DatePickerLayoutDelegate(
columnWidths: columnWidths
),
children:
pickers
)
)
)
);
}
}
public enum CupertinoTimerPickerMode {
hm,
ms,
hms,
}
public class CupertinoTimerPicker : StatefulWidget {
public CupertinoTimerPicker(
ValueChanged<TimeSpan> onTimerDurationChanged,
CupertinoTimerPickerMode mode = CupertinoTimerPickerMode.hms,
TimeSpan initialTimerDuration = new TimeSpan(),
int minuteInterval = 1,
int secondInterval = 1
) {
D.assert(onTimerDurationChanged != null);
D.assert(initialTimerDuration >= TimeSpan.Zero);
D.assert(initialTimerDuration < new TimeSpan(1, 0, 0, 0));
D.assert(minuteInterval > 0 && 60 % minuteInterval == 0);
D.assert(secondInterval > 0 && 60 % secondInterval == 0);
D.assert((int) initialTimerDuration.TotalMinutes % minuteInterval == 0);
D.assert((int) initialTimerDuration.TotalSeconds % secondInterval == 0);
this.onTimerDurationChanged = onTimerDurationChanged;
this.mode = mode;
this.initialTimerDuration = initialTimerDuration;
this.minuteInterval = minuteInterval;
this.secondInterval = secondInterval;
}
public readonly CupertinoTimerPickerMode mode;
public readonly TimeSpan initialTimerDuration;
public readonly int minuteInterval;
public readonly int secondInterval;
public readonly ValueChanged<TimeSpan> onTimerDurationChanged;
public override State createState() {
return new _CupertinoTimerPickerState();
}
}
class _CupertinoTimerPickerState : State<CupertinoTimerPicker> {
CupertinoLocalizations localizations;
Alignment alignCenterLeft;
Alignment alignCenterRight;
int selectedHour;
int selectedMinute;
int selectedSecond;
public override void initState() {
base.initState();
selectedMinute = (int) widget.initialTimerDuration.TotalMinutes % 60;
if (widget.mode != CupertinoTimerPickerMode.ms) {
selectedHour = (int) widget.initialTimerDuration.TotalHours;
}
if (widget.mode != CupertinoTimerPickerMode.hm) {
selectedSecond = (int) widget.initialTimerDuration.TotalSeconds % 60;
}
}
Widget _buildLabel(string text) {
return new Text(
text,
textScaleFactor: 0.8f,
style: new TextStyle(fontWeight: FontWeight.w600)
);
}
public override void didChangeDependencies() {
base.didChangeDependencies();
localizations = CupertinoLocalizations.of(context);
alignCenterLeft = Alignment.centerLeft;
alignCenterRight = Alignment.centerRight;
}
Widget _buildHourPicker() {
return new CupertinoPicker(
scrollController: new FixedExtentScrollController(initialItem: selectedHour),
offAxisFraction: -0.5f,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
backgroundColor: CupertinoDatePickerUtils._kBackgroundColor,
onSelectedItemChanged: (int index) => {
setState(() => {
selectedHour = index;
widget.onTimerDurationChanged(
new TimeSpan(
hours: selectedHour,
minutes: selectedMinute,
seconds: selectedSecond));
});
},
children: CupertinoDatePickerUtils.listGenerate(24, (int index) => {
float hourLabelWidth = widget.mode == CupertinoTimerPickerMode.hm
? CupertinoDatePickerUtils._kPickerWidth / 4
: CupertinoDatePickerUtils._kPickerWidth / 6;
return new Container(
alignment: alignCenterRight,
padding: EdgeInsets.only(right: hourLabelWidth),
child: new Container(
alignment: alignCenterRight,
padding: EdgeInsets.symmetric(horizontal: 2.0f),
child: new Text(localizations.timerPickerHour(index))
)
);
})
);
}
Widget _buildHourColumn() {
Widget hourLabel = new IgnorePointer(
child: new Container(
alignment: alignCenterRight,
child: new Container(
alignment: alignCenterLeft,
padding: EdgeInsets.symmetric(horizontal: 2.0f),
width: widget.mode == CupertinoTimerPickerMode.hm
? CupertinoDatePickerUtils._kPickerWidth / 4
: CupertinoDatePickerUtils._kPickerWidth / 6,
child: _buildLabel(localizations.timerPickerHourLabel(selectedHour))
)
)
);
return new Stack(
children: new List<Widget> {
_buildHourPicker(),
hourLabel
}
);
}
Widget _buildMinutePicker() {
float offAxisFraction;
if (widget.mode == CupertinoTimerPickerMode.hm) {
offAxisFraction = 0.5f;
}
else if (widget.mode == CupertinoTimerPickerMode.hms) {
offAxisFraction = 0.0f;
}
else {
offAxisFraction = -0.5f;
}
return new CupertinoPicker(
scrollController: new FixedExtentScrollController(
initialItem: selectedMinute / widget.minuteInterval
),
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
backgroundColor: CupertinoDatePickerUtils._kBackgroundColor,
onSelectedItemChanged: (int index) => {
setState(() => {
selectedMinute = index * widget.minuteInterval;
widget.onTimerDurationChanged(
new TimeSpan(
hours: selectedHour,
minutes: selectedMinute,
seconds: selectedSecond));
});
},
children: CupertinoDatePickerUtils.listGenerate(60 / widget.minuteInterval, (int index) => {
int minute = index * widget.minuteInterval;
if (widget.mode == CupertinoTimerPickerMode.ms) {
return new Container(
alignment: alignCenterRight,
padding: EdgeInsets.only(right: CupertinoDatePickerUtils._kPickerWidth / 4),
child: new Container(
alignment: alignCenterRight,
padding: EdgeInsets.symmetric(horizontal: 2.0f),
child: new Text(localizations.timerPickerMinute(minute))
)
);
}
else {
return new Container(
alignment: alignCenterLeft,
child: new Container(
alignment: alignCenterRight,
width: widget.mode == CupertinoTimerPickerMode.hm
? CupertinoDatePickerUtils._kPickerWidth / 10
: CupertinoDatePickerUtils._kPickerWidth / 6,
padding: EdgeInsets.symmetric(horizontal: 2.0f),
child:
new Text(localizations.timerPickerMinute(minute))
)
);
}
})
);
}
Widget _buildMinuteColumn() {
Widget minuteLabel;
if (widget.mode == CupertinoTimerPickerMode.hm) {
minuteLabel = new IgnorePointer(
child: new Container(
alignment: alignCenterLeft,
padding: EdgeInsets.only(left: CupertinoDatePickerUtils._kPickerWidth / 10),
child: new Container(
alignment: alignCenterLeft,
padding: EdgeInsets.symmetric(horizontal: 2.0f),
child: _buildLabel(localizations.timerPickerMinuteLabel(selectedMinute))
)
)
);
}
else {
minuteLabel = new IgnorePointer(
child: new Container(
alignment: alignCenterRight,
child: new Container(
alignment: alignCenterLeft,
width: widget.mode == CupertinoTimerPickerMode.ms
? CupertinoDatePickerUtils._kPickerWidth / 4
: CupertinoDatePickerUtils._kPickerWidth / 6,
padding: EdgeInsets.symmetric(horizontal: 2.0f),
child: _buildLabel(localizations.timerPickerMinuteLabel(selectedMinute))
)
)
);
}
return new Stack(
children: new List<Widget> {
_buildMinutePicker(),
minuteLabel
}
);
}
Widget _buildSecondPicker() {
float offAxisFraction = 0.5f;
float secondPickerWidth = widget.mode == CupertinoTimerPickerMode.ms
? CupertinoDatePickerUtils._kPickerWidth / 10
: CupertinoDatePickerUtils._kPickerWidth / 6;
return new CupertinoPicker(
scrollController: new FixedExtentScrollController(
initialItem: selectedSecond / widget.secondInterval
),
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
backgroundColor: CupertinoDatePickerUtils._kBackgroundColor,
onSelectedItemChanged: (int index) => {
setState(() => {
selectedSecond = index * widget.secondInterval;
widget.onTimerDurationChanged(
new TimeSpan(
hours: selectedHour,
minutes: selectedMinute,
seconds: selectedSecond));
});
},
children: CupertinoDatePickerUtils.listGenerate(60 / widget.secondInterval, (int index) => {
int second = index * widget.secondInterval;
return new Container(
alignment: alignCenterLeft,
child: new Container(
alignment: alignCenterRight,
padding: EdgeInsets.symmetric(horizontal: 2.0f),
width: secondPickerWidth,
child: new Text(localizations.timerPickerSecond(second))
)
);
})
);
}
Widget _buildSecondColumn() {
float secondPickerWidth = widget.mode == CupertinoTimerPickerMode.ms
? CupertinoDatePickerUtils._kPickerWidth / 10
: CupertinoDatePickerUtils._kPickerWidth / 6;
Widget secondLabel = new IgnorePointer(
child: new Container(
alignment: alignCenterLeft,
padding: EdgeInsets.only(left: secondPickerWidth),
child: new Container(
alignment: alignCenterLeft,
padding: EdgeInsets.symmetric(horizontal: 2.0f),
child: _buildLabel(localizations.timerPickerSecondLabel(selectedSecond))
)
)
);
return new Stack(
children: new List<Widget> {
_buildSecondPicker(),
secondLabel
}
);
}
public override Widget build(BuildContext context) {
Widget picker;
if (widget.mode == CupertinoTimerPickerMode.hm) {
picker = new Row(
children: new List<Widget> {
new Expanded(child: _buildHourColumn()),
new Expanded(child: _buildMinuteColumn()),
}
);
}
else if (widget.mode == CupertinoTimerPickerMode.ms) {
picker = new Row(
children: new List<Widget> {
new Expanded(child: _buildMinuteColumn()),
new Expanded(child: _buildSecondColumn()),
}
);
}
else {
picker = new Row(
children: new List<Widget> {
new Expanded(child: _buildHourColumn()),
new Container(
width: CupertinoDatePickerUtils._kPickerWidth / 3,
child: _buildMinuteColumn()
),
new Expanded(child: _buildSecondColumn()),
}
);
}
return new MediaQuery(
data: new MediaQueryData(
textScaleFactor: 1.0f
),
child: picker
);
}
}
}
/*
using System;
using System.Collections.Generic;
using Unity.UIWidgets.animation;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.rendering;
using Unity.UIWidgets.scheduler2;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
using TextStyle = Unity.UIWidgets.painting.TextStyle;
namespace Unity.UIWidgets.cupertino {
static class CupertinoDatePickerUtils {
public const float _kItemExtent = 32.0f;
public const float _kPickerWidth = 320.0f;
public const float _kPickerHeight = 216.0f;
public const bool _kUseMagnifier = true;
public const float _kMagnification = 1.05f;
public const float _kDatePickerPadSize = 12.0f;
public const float _kSqueeze = 1.25f;
public static Color _kBackgroundColor = CupertinoColors.white;
public static TextStyle _kDefaultPickerTextStyle = new TextStyle(
letterSpacing: -0.83f
);
public const float _kTimerPickerHalfColumnPadding = 2f;
public const float _kTimerPickerLabelPadSize = 4.5f;
public const float _kTimerPickerLabelFontSize = 17.0f;
public const float _kTimerPickerColumnIntrinsicWidth = 106f;
public const float _kTimerPickerNumberLabelFontSize = 23f;
public static TextStyle _themeTextStyle(BuildContext context, bool isValid = true ) {
TextStyle style = CupertinoTheme.of(context).textTheme.dateTimePickerTextStyle;
return isValid ? style : style.copyWith(color: CupertinoDynamicColor.resolve(CupertinoColors.inactiveGray, context));
}
public static void _animateColumnControllerToItem(FixedExtentScrollController controller, int targetItem) {
controller.animateToItem(
targetItem,
curve: Curves.easeInOut,
duration: new TimeSpan(0,0,0,0,200)
);
}
public delegate Widget listGenerateDelegate(int index);
public static List<Widget> listGenerate(int count, listGenerateDelegate func) {
var list = new List<Widget>();
for (int i = 0; i < count; i++) {
list.Add(func(i));
}
return list;
}
}
public class _DatePickerLayoutDelegate : MultiChildLayoutDelegate {
public _DatePickerLayoutDelegate(
List<float> columnWidths,
int textDirectionFactor
) {
D.assert(columnWidths != null);
D.assert(textDirectionFactor != null);
this.columnWidths = columnWidths;
this.textDirectionFactor = textDirectionFactor ;
}
public readonly List<float> columnWidths;
public readonly int textDirectionFactor;
public override void performLayout(Size size) {
float remainingWidth = size.width;
for (int i = 0; i < columnWidths.Count; i++) {
remainingWidth -= columnWidths[i] + CupertinoDatePickerUtils._kDatePickerPadSize * 2;
}
float currentHorizontalOffset = 0.0f;
for (int i = 0; i < columnWidths.Count; i++) {
int index = textDirectionFactor == 1 ? i : columnWidths.Count - i - 1;
float childWidth = columnWidths[index] + CupertinoDatePickerUtils._kDatePickerPadSize * 2;
if (index == 0 || index == columnWidths.Count - 1) {
childWidth += remainingWidth / 2;
}
D.assert(()=>{
if (childWidth < 0) {
throw new UIWidgetsError(
"Insufficient horizontal space to render the " +
"CupertinoDatePicker because the parent is too narrow at " +
$"{size.width}px.\n" + "An additional ${-remainingWidth}px is needed to avoid " +
"overlapping columns."
);
}
return true;
});
layoutChild(index, BoxConstraints.tight(new Size(childWidth, size.height)));
positionChild(index, new Offset(currentHorizontalOffset, 0.0f));
currentHorizontalOffset += childWidth;
}
}
public override bool shouldRelayout(MultiChildLayoutDelegate oldDelegate) {
return columnWidths != ((_DatePickerLayoutDelegate) oldDelegate).columnWidths
|| textDirectionFactor != ((_DatePickerLayoutDelegate) oldDelegate).textDirectionFactor;
}
}
public enum CupertinoDatePickerMode {
time,
date,
dateAndTime,
}
enum _PickerColumnType {
dayOfMonth,
month,
year,
date,
hour,
minute,
dayPeriod,
}
public class CupertinoDatePicker : StatefulWidget {
public CupertinoDatePicker(
Key key = null,
CupertinoDatePickerMode mode = CupertinoDatePickerMode.dateAndTime,
ValueChanged<DateTime> onDateTimeChanged = null,
DateTime? initialDateTime = null,
DateTime? minimumDate = null,
DateTime? maximumDate = null,
int minimumYear = 1,
int? maximumYear = null,
int minuteInterval = 1,
bool use24hFormat = false,
Color backgroundColor = null
) {
this.initialDateTime = initialDateTime ?? DateTime.Now;
D.assert(onDateTimeChanged != null);
D.assert(
minuteInterval > 0 && 60 % minuteInterval == 0,
() => "minute interval is not a positive integer factor of 60"
);
D.assert(this.initialDateTime != null);
D.assert(
mode != CupertinoDatePickerMode.dateAndTime || minimumDate == null ||
!(this.initialDateTime < minimumDate),
() => "initial date is before minimum date"
);
D.assert(
mode != CupertinoDatePickerMode.dateAndTime || maximumDate == null ||
!(this.initialDateTime > maximumDate),
() => "initial date is after maximum date"
);
D.assert(
mode != CupertinoDatePickerMode.date || (minimumYear >= 1 && this.initialDateTime.Year >= minimumYear),
() => "initial year is not greater than minimum year, or mininum year is not positive"
);
D.assert(
mode != CupertinoDatePickerMode.date || maximumYear == null || this.initialDateTime.Year <= maximumYear,
() => "initial year is not smaller than maximum year"
);
D.assert(
this.initialDateTime.Minute % minuteInterval == 0,
() => "initial minute is not divisible by minute interval"
);
this.onDateTimeChanged = onDateTimeChanged;
this.mode = mode;
this.minimumDate = minimumDate;
this.maximumDate = maximumDate;
this.minimumYear = minimumYear ;
this.maximumYear = maximumYear;
this.minuteInterval = minuteInterval ;
this.use24hFormat = use24hFormat;
this.backgroundColor = backgroundColor;
}
public readonly Color backgroundColor;
public readonly CupertinoDatePickerMode mode;
public readonly DateTime initialDateTime;
public readonly DateTime? minimumDate;
public readonly DateTime? maximumDate;
public readonly int minimumYear;
public readonly int? maximumYear;
public readonly int minuteInterval;
public readonly bool use24hFormat;
public readonly ValueChanged<DateTime> onDateTimeChanged;
public override State createState() {
if (mode == CupertinoDatePickerMode.time || mode == CupertinoDatePickerMode.dateAndTime) {
return new _CupertinoDatePickerDateTimeState();
}
else {
return new _CupertinoDatePickerDateState();
}
}
internal static float _getColumnWidth(
_PickerColumnType columnType,
CupertinoLocalizations localizations,
BuildContext context
) {
string longestText = "";
switch (columnType) {
case _PickerColumnType.date:
for (int i = 1; i <= 12; i++) {
string date =
localizations.datePickerMediumDate(new DateTime(2018, i, 25));
if (longestText.Length < date.Length) {
longestText = date;
}
}
break;
case _PickerColumnType.hour:
for (int i = 0; i < 24; i++) {
string hour = localizations.datePickerHour(i);
if (longestText.Length < hour.Length) {
longestText = hour;
}
}
break;
case _PickerColumnType.minute:
for (int i = 0; i < 60; i++) {
string minute = localizations.datePickerMinute(i);
if (longestText.Length < minute.Length) {
longestText = minute;
}
}
break;
case _PickerColumnType.dayPeriod:
longestText =
localizations.anteMeridiemAbbreviation.Length > localizations.postMeridiemAbbreviation.Length
? localizations.anteMeridiemAbbreviation
: localizations.postMeridiemAbbreviation;
break;
case _PickerColumnType.dayOfMonth:
for (int i = 1; i <= 31; i++) {
string dayOfMonth = localizations.datePickerDayOfMonth(i);
if (longestText.Length < dayOfMonth.Length) {
longestText = dayOfMonth;
}
}
break;
case _PickerColumnType.month:
for (int i = 1; i <= 12; i++) {
string month = localizations.datePickerMonth(i);
if (longestText.Length < month.Length) {
longestText = month;
}
}
break;
case _PickerColumnType.year:
longestText = localizations.datePickerYear(2018);
break;
}
D.assert(longestText != "", () => "column type is not appropriate");
TextPainter painter = new TextPainter(
text: new TextSpan(
style: DefaultTextStyle.of(context).style,
text: longestText
),
textDirection: Directionality.of(context)
);
painter.layout();
return painter.maxIntrinsicWidth;
}
}
delegate Widget _ColumnBuilder(float offAxisFraction, TransitionBuilder itemPositioningBuilder);
class _CupertinoDatePickerDateTimeState : State<CupertinoDatePicker> {
public static readonly float _kMaximumOffAxisFraction = 0.45f;
public CupertinoLocalizations localizations;
public int textDirectionFactor;
public Alignment alignCenterLeft;
public Alignment alignCenterRight;
public DateTime initialDateTime;
public int selectedDayFromInitial
{
get {
switch (widget.mode) {
case CupertinoDatePickerMode.dateAndTime:
return dateController.hasClients ? dateController.selectedItem : 0;
case CupertinoDatePickerMode.time:
return 0;
case CupertinoDatePickerMode.date:
break;
}
D.assert(
false,()=>"$runtimeType is only meant for dateAndTime mode or time mode");
return 0;
}
}
public FixedExtentScrollController dateController;
public int selectedHour
{
get{
return _selectedHour(selectedAmPm, _selectedHourIndex);
}
}
public int _selectedHourIndex {
get {
return hourController. hasClients ? hourController. selectedItem % 24 : initialDateTime.hour;
}
}
public int _selectedHour(int selectedAmPm, int selectedHour) {
return _isHourRegionFlipped(selectedAmPm) ? (selectedHour + 12) % 24 : selectedHour;
}
public FixedExtentScrollController hourController;
public int selectedMinute
{
get {
return minuteController.hasClients
? minuteController.selectedItem * widget.minuteInterval % 60
: initialDateTime.minute;
}
}
// The controller of the minute column.
FixedExtentScrollController minuteController;
public int previousHourIndex;
public int selectedAmPm;
public bool isHourRegionFlipped => _isHourRegionFlipped(selectedAmPm);
bool _isHourRegionFlipped(int selectedAmPm) => selectedAmPm != meridiemRegion;
int meridiemRegion;
FixedExtentScrollController meridiemController;
bool isDatePickerScrolling = false;
bool isHourPickerScrolling = false;
bool isMinutePickerScrolling = false;
bool isMeridiemPickerScrolling = false;
bool isScrolling {
get{return isDatePickerScrolling
|| isHourPickerScrolling
|| isMinutePickerScrolling
|| isMeridiemPickerScrolling;
}
}
public static Dictionary<int, float> estimatedColumnWidths = new Dictionary<int, float>();
public override void initState() {
base.initState();
initialDateTime = widget.initialDateTime;
selectedAmPm = (int)(initialDateTime.hour / 12);
meridiemRegion = selectedAmPm;
meridiemController = new FixedExtentScrollController(initialItem: selectedAmPm);
hourController = new FixedExtentScrollController(initialItem: initialDateTime.hour);
minuteController = new FixedExtentScrollController(initialItem: (int)(initialDateTime.minute / widget.minuteInterval));
dateController = new FixedExtentScrollController(initialItem: 0);
PaintingBinding.instance.systemFonts.addListener(_handleSystemFontsChange);
}
public void _handleSystemFontsChange () {
setState(()=>{
estimatedColumnWidths.Clear();
});
}
public override void dispose() {
dateController.dispose();
hourController.dispose();
minuteController.dispose();
meridiemController.dispose();
PaintingBinding.instance.systemFonts.removeListener(_handleSystemFontsChange);
base.dispose();
}
public override void didUpdateWidget(StatefulWidget oldWidget) {
base.didUpdateWidget(oldWidget);
D.assert(
((CupertinoDatePicker) oldWidget).mode == widget.mode,
() => "The CupertinoDatePicker's mode cannot change once it's built"
);
if (!widget.use24hFormat && oldWidget.use24hFormat) {
meridiemController.dispose();
meridiemController = FixedExtentScrollController(initialItem: selectedAmPm);
}
}
public override void didChangeDependencies() {
base.didChangeDependencies();
textDirectionFactor = Directionality.of(context) == TextDirection.ltr ? 1 : -1;
localizations = CupertinoLocalizations.of(context);
alignCenterLeft = textDirectionFactor == 1 ? Alignment.centerLeft : Alignment.centerRight;
alignCenterRight = textDirectionFactor == 1 ? Alignment.centerRight : Alignment.centerLeft;
estimatedColumnWidths.Clear();
}
float _getEstimatedColumnWidth(_PickerColumnType columnType) {
if (!estimatedColumnWidths.TryGetValue((int) columnType, out float _)) {
estimatedColumnWidths[(int) columnType] =
CupertinoDatePicker._getColumnWidth(columnType, localizations, context);
}
return estimatedColumnWidths[(int) columnType];
}
public DateTime selectedDateTime {
get{
return new DateTime(
initialDateTime.year,
initialDateTime.month,
initialDateTime.day + selectedDayFromInitial,
selectedHour,
selectedMinute
);
}
}
public void _onSelectedItemChange(int index) {
DateTime selected = selectedDateTime;
bool isDateInvalid = widget.minimumDate?.isAfter(selected) == true
|| widget.maximumDate?.isBefore(selected) == true;
if (isDateInvalid)
return;
widget.onDateTimeChanged(selected);
}
Widget _buildMediumDatePicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
//// tbc notification
return
new NotificationListener<ScrollNotification>(
onNotification: (ScrollNotification notification)=> {
if (notification is ScrollStartNotification) {
isDatePickerScrolling = true;
} else if (notification is ScrollEndNotification) {
isDatePickerScrolling = false;
_pickerDidStopScrolling();
}
return false;
},
child: CupertinoPicker.builder(
scrollController: dateController,
offAxisFraction: offAxisFraction,
itemExtent:CupertinoDatePickerUtils. _kItemExtent,
useMagnifier:CupertinoDatePickerUtils. _kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: widget.backgroundColor,
squeeze: CupertinoDatePickerUtils._kSqueeze,
onSelectedItemChanged: (int index) => {
_onSelectedItemChange(index);
},
itemBuilder: (BuildContext context, int index) => {
DateTime rangeStart = new DateTime(
initialDateTime.year,
initialDateTime.month,
initialDateTime.day + index
);
// Exclusive.
DateTime rangeEnd = new DateTime(
initialDateTime.year,
initialDateTime.month,
initialDateTime.day + index + 1
);
DateTime now = DateTime.Now;
if (widget.minimumDate?.isAfter(rangeEnd) == true)
return null;
if (widget.maximumDate?.isAfter(rangeStart) == false)
return null;
string dateText = rangeStart == new DateTime(now.year, now.month, now.day)
? localizations.todayLabel
: localizations.datePickerMediumDate(rangeStart);
return itemPositioningBuilder(
context,
new Text(dateText, style: _themeTextStyle(context))
);
}
)
);
}
bool _isValidHour(int meridiemIndex, int hourIndex) {
DateTime rangeStart = new DateTime(
initialDateTime.year,
initialDateTime.month,
initialDateTime.day + selectedDayFromInitial,
_selectedHour(meridiemIndex, hourIndex),
0
);
// The end value of the range is exclusive, i.e. [rangeStart, rangeEnd).
DateTime rangeEnd = rangeStart.Add( new TimeSpan(10,0,0));
return (widget.minimumDate?.isBefore(rangeEnd) ?? true)
&& !(widget.maximumDate?.isBefore(rangeStart) ?? false);
}
Widget _buildHourPicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
return new NotificationListener<ScrollNotification>(
onNotification: (ScrollNotification notification) => {
if (notification is ScrollStartNotification) {
isHourPickerScrolling = true;
} else if (notification is ScrollEndNotification) {
isHourPickerScrolling = false;
_pickerDidStopScrolling();
}
return false;
},
child:
new CupertinoPicker(
scrollController: dateController,//new FixedExtentScrollController(initialItem: selectedHour),
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: widget.backgroundColor,//CupertinoDatePickerUtils._kBackgroundColor,
squeeze: CupertinoDatePickerUtils._kSqueeze,
onSelectedItemChanged: (int index) => {
bool regionChanged = meridiemRegion != index % 12;
bool debugIsFlipped = isHourRegionFlipped;
if (regionChanged) {
meridiemRegion = index % 12;
selectedAmPm = 1 - selectedAmPm;
}
if (!widget.use24hFormat && regionChanged) {
meridiemController.animateToItem(
selectedAmPm,
duration: new TimeSpan(0,0,0,0, 300),
curve: Curves.easeOut
);
}
else {
_onSelectedItemChange(index);
}
D.assert(debugIsFlipped == isHourRegionFlipped);
},
children: CupertinoDatePickerUtils.listGenerate(24, (index) => {
int hour = isHourRegionFlipped ? (index + 12) % 24 : index;//hour = index;
int displayHour = widget.use24hFormat ? hour : (hour + 11) % 12 + 1;
return itemPositioningBuilder(context,
new Text(
localizations.datePickerHour(hour),
semanticsLabel: localizations.datePickerHourSemanticsLabel(displayHour),
style: _themeTextStyle(context, isValid: _isValidHour(selectedAmPm, index))
)
);
}
),
looping: true
);
}
Widget _buildMinutePicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
return new NotificationListener<ScrollNotification>(
onNotification: (ScrollNotification notification) => {
if (notification is ScrollStartNotification) {
isMinutePickerScrolling = true;
} else if (notification is ScrollEndNotification) {
isMinutePickerScrolling = false;
_pickerDidStopScrolling();
}
return false;
},
child:
new CupertinoPicker(
scrollController: minuteController,
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: widget.backgroundColor,//CupertinoDatePickerUtils._kBackgroundColor,
squeeze: CupertinoDatePickerUtils._kSqueeze,
children: CupertinoDatePickerUtils.listGenerate((int)(60 / widget.minuteInterval), (int index) =>{
int minute = index * widget.minuteInterval;
DateTime date = new DateTime(
initialDateTime.year,
initialDateTime.month,
initialDateTime.day + selectedDayFromInitial,
selectedHour,
minute
);
bool isInvalidMinute = (widget.minimumDate?.isAfter(date) ?? false)
|| (widget.maximumDate?.isBefore(date) ?? false);
return itemPositioningBuilder(
context,
new Text(
localizations.datePickerMinute(minute),
semanticsLabel: localizations.datePickerMinuteSemanticsLabel(minute),
style: _themeTextStyle(context, isValid: !isInvalidMinute)
)
);
}),
looping: true
);
}
Widget _buildAmPmPicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
return new NotificationListener<ScrollNotification>(
onNotification: (ScrollNotification notification) => {
if (notification is ScrollStartNotification) {
isMeridiemPickerScrolling = true;
} else if (notification is ScrollEndNotification) {
isMeridiemPickerScrolling = false;
_pickerDidStopScrolling();
}
return false;
},
child: new CupertinoPicker(
scrollController: meridiemController,//amPmController,
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: widget.backgroundColor,
squeeze:CupertinoDatePickerUtils._kSqueeze,
onSelectedItemChanged: (int index) => {
//selectedAmPm = index;
//widget.onDateTimeChanged(_getDateTime());
selectedAmPm = index;
D.assert(selectedAmPm == 0 || selectedAmPm == 1);
_onSelectedItemChange(index);
},
children: CupertinoDatePickerUtils.listGenerate(2, (int index) => {
return itemPositioningBuilder(context,
new Text(
index == 0
? localizations.anteMeridiemAbbreviation
: localizations.postMeridiemAbbreviation,
style: _themeTextStyle(context, isValid: _isValidHour(index, _selectedHourIndex))
)
);
})
);
}
void _pickerDidStopScrolling() {
setState(()=>{ });
if (isScrolling)
return;
DateTime selectedDate = selectedDateTime;
bool minCheck = widget.minimumDate?.isAfter(selectedDate) ?? false;
bool maxCheck = widget.maximumDate?.isBefore(selectedDate) ?? false;
if (minCheck || maxCheck) {
DateTime targetDate = minCheck ? widget.minimumDate : widget.maximumDate;
_scrollToDate(targetDate, selectedDate);
}
}
void _scrollToDate(DateTime newDate, DateTime fromDate) {
D.assert(newDate != null);
SchedulerBinding.instance.addPostFrameCallback((stamp => {
if (fromDate.year != newDate.year || fromDate.month != newDate.month || fromDate.day != newDate.day) {
_animateColumnControllerToItem(dateController, selectedDayFromInitial);
}
if (fromDate.hour != newDate.hour) {
bool needsMeridiemChange = !widget.use24hFormat
&& (int)(fromDate.hour / 12) != (int)(newDate.hour / 12);
// In AM/PM mode, the pickers should not scroll all the way to the other hour region.
if (needsMeridiemChange) {
_animateColumnControllerToItem(meridiemController, 1 - meridiemController.selectedItem);
// Keep the target item index in the current 12-h region.
int newItem = ((int)(hourController.selectedItem / 12)) * 12
+ (hourController.selectedItem + newDate.hour - fromDate.hour) % 12;
_animateColumnControllerToItem(hourController, newItem);
} else {
_animateColumnControllerToItem(
hourController,
hourController.selectedItem + newDate.hour - fromDate.hour,
);
}
}
if (fromDate.minute != newDate.minute) {
_animateColumnControllerToItem(minuteController, newDate.minute);
}
});
}
public override Widget build(BuildContext context) {
List<float> columnWidths = new List<float>() {
_getEstimatedColumnWidth(_PickerColumnType.hour),
_getEstimatedColumnWidth(_PickerColumnType.minute),
};
List<_ColumnBuilder> pickerBuilders = new List<_ColumnBuilder> {
_buildHourPicker, _buildMinutePicker,
};
if (!widget.use24hFormat) {
if (localizations.datePickerDateTimeOrder == DatePickerDateTimeOrder.date_time_dayPeriod
|| localizations.datePickerDateTimeOrder == DatePickerDateTimeOrder.time_dayPeriod_date) {
pickerBuilders.Add(_buildAmPmPicker);
columnWidths.Add(_getEstimatedColumnWidth(_PickerColumnType.dayPeriod));
}
else {
pickerBuilders.Insert(0, _buildAmPmPicker);
columnWidths.Insert(0, _getEstimatedColumnWidth(_PickerColumnType.dayPeriod));
}
}
if (widget.mode == CupertinoDatePickerMode.dateAndTime) {
if (localizations.datePickerDateTimeOrder == DatePickerDateTimeOrder.time_dayPeriod_date
|| localizations.datePickerDateTimeOrder == DatePickerDateTimeOrder.dayPeriod_time_date) {
pickerBuilders.Add(_buildMediumDatePicker);
columnWidths.Add(_getEstimatedColumnWidth(_PickerColumnType.date));
}
else {
pickerBuilders.Insert(0, _buildMediumDatePicker);
columnWidths.Insert(0, _getEstimatedColumnWidth(_PickerColumnType.date));
}
}
List<Widget> pickers = new List<Widget>();
for (int i = 0; i < columnWidths.Count; i++) {
float offAxisFraction = 0.0f;
if (i == 0)
offAxisFraction = -_kMaximumOffAxisFraction * textDirectionFactor;
else if (i >= 2 || columnWidths.Count == 2)
offAxisFraction = _kMaximumOffAxisFraction * textDirectionFactor;
EdgeInsets padding = EdgeInsets.only(right: CupertinoDatePickerUtils._kDatePickerPadSize);
if (i == columnWidths.Count - 1)
padding = padding.flipped;
if (textDirectionFactor == -1)
padding = padding.flipped;
pickers.Add(new LayoutId(
id: i,
child: pickerBuilders[i](
offAxisFraction,
(BuildContext _context, Widget child) => {
return new Container(
alignment: i == columnWidths.Count - 1
? alignCenterLeft
: alignCenterRight,
padding: padding,
child: new Container(
alignment: i == columnWidths.Count - 1
? alignCenterLeft
: alignCenterRight,
width: i == 0 || i == columnWidths.Count - 1
? (float?) null
: columnWidths[i] + CupertinoDatePickerUtils._kDatePickerPadSize,
child: child
)
);
}
)
));
}
return new MediaQuery(
data: new MediaQueryData(textScaleFactor: 1.0f),
child: DefaultTextStyle.merge(
style: CupertinoDatePickerUtils._kDefaultPickerTextStyle,
child: new CustomMultiChildLayout(
layoutDelegate: new _DatePickerLayoutDelegate(
columnWidths: columnWidths,
textDirectionFactor: textDirectionFactor
),
children: pickers
)
)
);
}
}
class _CupertinoDatePickerDateState : State<CupertinoDatePicker> {
int textDirectionFactor;
CupertinoLocalizations localizations;
Alignment alignCenterLeft;
Alignment alignCenterRight;
int selectedDay;
int selectedMonth;
int selectedYear;
FixedExtentScrollController dayController;
FixedExtentScrollController monthController;
FixedExtentScrollController yearController;
bool isDayPickerScrolling = false;
bool isMonthPickerScrolling = false;
bool isYearPickerScrolling = false;
bool isScrolling
{
get{
return isDayPickerScrolling || isMonthPickerScrolling || isYearPickerScrolling;
}
}
Dictionary<int, float> estimatedColumnWidths = new Dictionary<int, float>();
public override void initState() {
base.initState();
selectedDay = widget.initialDateTime.Day;
selectedMonth = widget.initialDateTime.Month;
selectedYear = widget.initialDateTime.Year;
dayController = new FixedExtentScrollController(initialItem: selectedDay - 1);
monthController = new FixedExtentScrollController(initialItem: selectedMonth - 1);
yearController = new FixedExtentScrollController(initialItem: selectedYear);
/// tbc???
PaintingBinding.instance.systemFonts.addListener(_handleSystemFontsChange);
}
void _handleSystemFontsChange() {
setState(() => {
// System fonts change might cause the text layout width to change.
_refreshEstimatedColumnWidths();
});
}
public override void dispose() {
dayController.dispose();
monthController.dispose();
yearController.dispose();
PaintingBinding.instance.systemFonts.removeListener(_handleSystemFontsChange);
base.dispose();
}
public override void didChangeDependencies() {
base.didChangeDependencies();
textDirectionFactor = Directionality.of(context) == TextDirection.ltr ? 1 : -1;
localizations = CupertinoLocalizations.of(context);
alignCenterLeft = textDirectionFactor == 1 ? Alignment.centerLeft : Alignment.centerRight;
alignCenterRight = textDirectionFactor == 1 ? Alignment.centerRight : Alignment.centerLeft;
_refreshEstimatedColumnWidths();
}
public void _refreshEstimatedColumnWidths(){
estimatedColumnWidths[(int) _PickerColumnType.dayOfMonth] = CupertinoDatePicker._getColumnWidth(
_PickerColumnType.dayOfMonth, localizations, context);
estimatedColumnWidths[(int) _PickerColumnType.month] = CupertinoDatePicker._getColumnWidth(
_PickerColumnType.month, localizations, context);
estimatedColumnWidths[(int) _PickerColumnType.year] = CupertinoDatePicker._getColumnWidth(
_PickerColumnType.year, localizations, context);
}
DateTime _lastDayInMonth(int year, int month) => new DateTime(year, month + 1, 0);
Widget _buildDayPicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
int daysInCurrentMonth = _lastDayInMonth(selectedYear, selectedMonth).day;//DateTime.DaysInMonth(selectedYear, selectedMonth);
return new NotificationListener<ScrollNotification>(
onNotification: (ScrollNotification notification)=> {
if (notification is ScrollStartNotification) {
isDayPickerScrolling = true;
} else if (notification is ScrollEndNotification) {
isDayPickerScrolling = false;
_pickerDidStopScrolling();
}
return false;
},
child:
new CupertinoPicker(
scrollController: dayController,
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: widget.backgroundColor,
squeeze: CupertinoDatePickerUtils._kSqueeze,
onSelectedItemChanged: (int index) => {
selectedDay = index + 1;
selectedDay = index + 1;
if (_isCurrentDateValid)
widget.onDateTimeChanged(new DateTime(selectedYear, selectedMonth, selectedDay));
},
children: CupertinoDatePickerUtils.listGenerate(31, (int index) => {
int day = index + 1;
return itemPositioningBuilder(
context,
new Text(
localizations.datePickerDayOfMonth(day),
style: _themeTextStyle(context, isValid: day <= daysInCurrentMonth)
)
);
}),
looping: true
);
}
Widget _buildMonthPicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
return new NotificationListener<ScrollNotification>(
onNotification: (ScrollNotification notification) => {
if (notification is ScrollStartNotification) {
isMonthPickerScrolling = true;
} else if (notification is ScrollEndNotification) {
isMonthPickerScrolling = false;
_pickerDidStopScrolling();
}
return false;
},
child:
new CupertinoPicker(
scrollController: monthController,//new FixedExtentScrollController(initialItem: selectedMonth - 1),
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: widget.backgroundColor,
squeeze: CupertinoDatePickerUtils._kSqueeze,
onSelectedItemChanged: (int index) => {
selectedMonth = index + 1;
if (_isCurrentDateValid)
widget.onDateTimeChanged(new DateTime(selectedYear, selectedMonth, selectedDay));
},
children: CupertinoDatePickerUtils.listGenerate(12, (int index) => {
int month = index + 1;
bool isInvalidMonth = (widget.minimumDate?.year == selectedYear && widget.minimumDate.month > month)
|| (widget.maximumDate?.year == selectedYear && widget.maximumDate.month < month);
return itemPositioningBuilder(
context,
new Text(
localizations.datePickerMonth(month),
style: _themeTextStyle(context, isValid: !isInvalidMonth)
)
);
}),
looping: true
);
}
Widget _buildYearPicker(float offAxisFraction, TransitionBuilder itemPositioningBuilder) {
return new NotificationListener<ScrollNotification>(
onNotification: (ScrollNotification notification)=> {
if (notification is ScrollStartNotification) {
isYearPickerScrolling = true;
} else if (notification is ScrollEndNotification) {
isYearPickerScrolling = false;
_pickerDidStopScrolling();
}
return false;
},
child:
CupertinoPicker.builder(
scrollController: yearController,//new FixedExtentScrollController(initialItem: selectedYear),
itemExtent: CupertinoDatePickerUtils._kItemExtent,
offAxisFraction: offAxisFraction,
useMagnifier: CupertinoDatePickerUtils._kUseMagnifier,
magnification: CupertinoDatePickerUtils._kMagnification,
backgroundColor: widget.backgroundColor,/// tbc????
onSelectedItemChanged: (int index) => {
selectedYear = index;
if (_isCurrentDateValid)
widget.onDateTimeChanged(new DateTime(selectedYear, selectedMonth, selectedDay));
},
itemBuilder: (BuildContext context, int index) => {
if (index < widget.minimumYear) {
return null;
}
if (widget.maximumYear != null && index > widget.maximumYear) {
return null;
}
bool isValidYear = (widget.minimumDate == null || widget.minimumDate.year <= year)
&& (widget.maximumDate == null || widget.maximumDate.year >= year);
return itemPositioningBuilder(
context,
new Text(
localizations.datePickerYear(year),
style: _themeTextStyle(context, isValid: isValidYear)
)
);
}
);
}
bool _isCurrentDateValid {
get{
DateTime minSelectedDate = new DateTime(selectedYear, selectedMonth, selectedDay);
DateTime maxSelectedDate = new DateTime(selectedYear, selectedMonth, selectedDay + 1);
bool minCheck = widget.minimumDate?.isBefore(maxSelectedDate) ?? true;
bool maxCheck = widget.maximumDate?.isBefore(minSelectedDate) ?? false;
return minCheck && !maxCheck && minSelectedDate.day == selectedDay;
}
}
void _pickerDidStopScrolling() {
setState(()=>{ });
if (isScrolling) {
return;
}
DateTime minSelectDate = new DateTime(selectedYear, selectedMonth, selectedDay);
DateTime maxSelectDate = new DateTime(selectedYear, selectedMonth, selectedDay + 1);
bool minCheck = widget.minimumDate?.isBefore(maxSelectDate) ?? true;
bool maxCheck = widget.maximumDate?.isBefore(minSelectDate) ?? false;
if (!minCheck || maxCheck) {
DateTime targetDate = minCheck ? widget.maximumDate : widget.minimumDate;
_scrollToDate(targetDate);
return;
}
if (minSelectDate.day != selectedDay) {
DateTime lastDay = _lastDayInMonth(selectedYear, selectedMonth);
_scrollToDate(lastDay);
}
}
void _scrollToDate(DateTime newDate) {
D.assert(newDate != null);
SchedulerBinding.instance.addPostFrameCallback((Duration timestamp) {
if (selectedYear != newDate.year) {
_animateColumnControllerToItem(yearController, newDate.year);
}
if (selectedMonth != newDate.month) {
_animateColumnControllerToItem(monthController, newDate.month - 1);
}
if (selectedDay != newDate.day) {
_animateColumnControllerToItem(dayController, newDate.day - 1);
}
});
}
public override Widget build(BuildContext context) {
List<_ColumnBuilder> pickerBuilders = new List<_ColumnBuilder>();
List<float> columnWidths = new List<float>();
switch (localizations.datePickerDateOrder) {
case DatePickerDateOrder.mdy:
pickerBuilders = new List<_ColumnBuilder>()
{_buildMonthPicker, _buildDayPicker, _buildYearPicker};
columnWidths = new List<float>() {
estimatedColumnWidths[(int) _PickerColumnType.month],
estimatedColumnWidths[(int) _PickerColumnType.dayOfMonth],
estimatedColumnWidths[(int) _PickerColumnType.year]
};
break;
case DatePickerDateOrder.dmy:
pickerBuilders = new List<_ColumnBuilder>
{_buildDayPicker, _buildMonthPicker, _buildYearPicker};
columnWidths = new List<float> {
estimatedColumnWidths[(int) _PickerColumnType.dayOfMonth],
estimatedColumnWidths[(int) _PickerColumnType.month],
estimatedColumnWidths[(int) _PickerColumnType.year]
};
break;
case DatePickerDateOrder.ymd:
pickerBuilders = new List<_ColumnBuilder>
{_buildYearPicker, _buildMonthPicker, _buildDayPicker};
columnWidths = new List<float>() {
estimatedColumnWidths[(int) _PickerColumnType.year],
estimatedColumnWidths[(int) _PickerColumnType.month],
estimatedColumnWidths[(int) _PickerColumnType.dayOfMonth]
};
break;
case DatePickerDateOrder.ydm:
pickerBuilders = new List<_ColumnBuilder>
{_buildYearPicker, _buildDayPicker, _buildMonthPicker};
columnWidths = new List<float> {
estimatedColumnWidths[(int) _PickerColumnType.year],
estimatedColumnWidths[(int) _PickerColumnType.dayOfMonth],
estimatedColumnWidths[(int) _PickerColumnType.month]
};
break;
default:
D.assert(false, () => "date order is not specified");
break;
}
List<Widget> pickers = new List<Widget>();
for (int i = 0; i < columnWidths.Count; i++) {
//var _i = i;
float offAxisFraction = (i - 1) * 0.3f * textDirectionFactor;
EdgeInsets padding = EdgeInsets.only(right: CupertinoDatePickerUtils._kDatePickerPadSize);
if (textDirectionFactor == -1)
padding = EdgeInsets.only(left: CupertinoDatePickerUtils._kDatePickerPadSize);
pickers.Add(new LayoutId(
id: i,
child: pickerBuilders[i](
offAxisFraction,
(BuildContext _context, Widget child) => {
return new Container(
alignment: i == columnWidths.Count - 1
? alignCenterLeft
: alignCenterRight,
padding: i == 0 ? null : padding,
child: new Container(
alignment: i == 0 ? alignCenterLeft : alignCenterRight,
width: columnWidths[i] + CupertinoDatePickerUtils._kDatePickerPadSize,
child: child
)
);
}
)
));
}
return new MediaQuery(
data: new MediaQueryData(textScaleFactor: 1.0f),
child: new NotificationListener<ScrollEndNotification>(
//onNotification: _keepInValidRange,
child: DefaultTextStyle.merge(
style: CupertinoDatePickerUtils._kDefaultPickerTextStyle,
child: new CustomMultiChildLayout(
layoutDelegate: new _DatePickerLayoutDelegate(
columnWidths: columnWidths,
textDirectionFactor: textDirectionFactor
),
children:
pickers
)
)
)
);
}
}
public enum CupertinoTimerPickerMode {
hm,
ms,
hms,
}
public class CupertinoTimerPicker : StatefulWidget {
public CupertinoTimerPicker(
Key key,
CupertinoTimerPickerMode mode = CupertinoTimerPickerMode.hms,
TimeSpan initialTimerDuration = new TimeSpan(),
int minuteInterval = 1,
int secondInterval = 1,
AlignmentGeometry alignment = Alignment.center,
Color backgroundColor = null,
ValueChanged<TimeSpan> onTimerDurationChanged = null
):base(key : key) {
D.assert(mode != null);
D.assert(onTimerDurationChanged != null);
D.assert(initialTimerDuration >= TimeSpan.Zero);
D.assert(initialTimerDuration < new TimeSpan(1, 0, 0, 0));
D.assert(minuteInterval > 0 && 60 % minuteInterval == 0);
D.assert(secondInterval > 0 && 60 % secondInterval == 0);
D.assert((int) initialTimerDuration.TotalMinutes % minuteInterval == 0);
D.assert((int) initialTimerDuration.TotalSeconds % secondInterval == 0);
D.assert(alignment != null);
this.onTimerDurationChanged = onTimerDurationChanged;
this.mode = mode;
this.initialTimerDuration = initialTimerDuration;
this.minuteInterval = minuteInterval;
this.secondInterval = secondInterval;
this.alignment = alignment;
this.backgroundColor = backgroundColor;
}
public readonly CupertinoTimerPickerMode mode;
public readonly TimeSpan initialTimerDuration;
public readonly int minuteInterval;
public readonly int secondInterval;
public readonly ValueChanged<TimeSpan> onTimerDurationChanged;
public readonly AlignmentGeometry alignment;
public readonly Color backgroundColor;
public override State createState() {
return new _CupertinoTimerPickerState();
}
}
class _CupertinoTimerPickerState : State<CupertinoTimerPicker> {
TextDirection textDirection;
CupertinoLocalizations localizations;
int textDirectionFactor {
get{
switch (textDirection) {
case TextDirection.ltr:
return 1;
case TextDirection.rtl:
return -1;
}
return 1;
}
}
//Alignment alignCenterLeft;
//Alignment alignCenterRight;
int selectedHour;
int selectedMinute;
int selectedSecond;
int lastSelectedHour;
int lastSelectedMinute;
int lastSelectedSecond;
TextPainter textPainter = new TextPainter();
List<string> numbers = CupertinoDatePickerUtils.listGenerate(10, (int i) =>
int minusValue = 9 -i;
return minus + " "
);///tbc ???
float numberLabelWidth;
float numberLabelHeight;
float numberLabelBaseline;
public override void initState() {
base.initState();
selectedMinute = (int) widget.initialTimerDuration.TotalMinutes % 60;
if (widget.mode != CupertinoTimerPickerMode.ms) {
selectedHour = (int) widget.initialTimerDuration.TotalHours;
}
if (widget.mode != CupertinoTimerPickerMode.hm) {
selectedSecond = (int) widget.initialTimerDuration.TotalSeconds % 60;
}
PaintingBinding.instance.systemFonts.addListener(_handleSystemFontsChange);/// tbc ???
}
void _handleSystemFontsChange() {
setState(()=> {
// System fonts change might cause the text layout width to change.
textPainter.markNeedsLayout();
_measureLabelMetrics();
});
}
public override void dispose() {
PaintingBinding.instance.systemFonts.removeListener(_handleSystemFontsChange);
base.dispose();
}
public override void didUpdateWidget(CupertinoTimerPicker oldWidget) {
base.didUpdateWidget(oldWidget);
D.assert(
oldWidget.mode == widget.mode, ()=>"The CupertinoTimerPicker's mode cannot change once it's built" );
}
public override void didChangeDependencies() {
base.didChangeDependencies();
//localizations = CupertinoLocalizations.of(context);
//alignCenterLeft = Alignment.centerLeft;
//alignCenterRight = Alignment.centerRight;
textDirection = Directionality.of(context);
localizations = CupertinoLocalizations.of(context);
_measureLabelMetrics();
}
void _measureLabelMetrics() {
textPainter.textDirection = textDirection;
TextStyle textStyle = _textStyleFrom(context);
float maxWidth = float.negativeInfinity;
string widestNumber;
foreach (string input in numbers) {
textPainter.text = new TextSpan(
text: input,
style: textStyle
);
textPainter.layout();
if (textPainter.maxIntrinsicWidth > maxWidth) {
maxWidth = textPainter.maxIntrinsicWidth;
widestNumber = input;
}
}
textPainter.text = new TextSpan(
text: '$widestNumber$widestNumber',
style: textStyle
);
textPainter.layout();
numberLabelWidth = textPainter.maxIntrinsicWidth;
numberLabelHeight = textPainter.height;
numberLabelBaseline = textPainter.computeDistanceToActualBaseline(TextBaseline.alphabetic);
}
Widget _buildLabel(string text, EdgeInsetsDirectional pickerPadding) {
EdgeInsetsDirectional padding = EdgeInsetsDirectional.only(
start: numberLabelWidth
+ CupertinoDatePickerUtils._kTimerPickerLabelPadSize
+ pickerPadding.start
);
return new IgnorePointer(
child: new Container(
alignment: AlignmentDirectional.centerStart.resolve(textDirection),
padding: padding.resolve(textDirection),
child: new SizedBox(
height: numberLabelHeight,
child: new Baseline(
baseline: numberLabelBaseline,
baselineType: TextBaseline.alphabetic,
child: new Text(
text,
style: new TextStyle(
fontSize: CupertinoDatePickerUtils._kTimerPickerLabelFontSize,
fontWeight: FontWeight.w600
),
maxLines: 1,
softWrap: false
)
)
)
)
);
}
Widget _buildPickerNumberLabel(string text, EdgeInsetsDirectional padding) {
return new Container(
width: _kTimerPickerColumnIntrinsicWidth + padding.horizontal,
padding: padding.resolve(textDirection),
alignment: AlignmentDirectional.centerStart.resolve(textDirection),
child: new Container(
width: numberLabelWidth,
alignment: AlignmentDirectional.centerEnd.resolve(textDirection),
child: new Text(text, softWrap: false, maxLines: 1, overflow: TextOverflow.visible)
)
);
}
Widget _buildHourPicker() {
return new CupertinoPicker(
scrollController: new FixedExtentScrollController(initialItem: selectedHour),
offAxisFraction: -0.5f * textDirectionFactor,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
backgroundColor: widget.backgroundColor,
squeeze: CupertinoDatePickerUtils._kSqueeze,
onSelectedItemChanged: (int index) => {
setState(() => {
selectedHour = index;
widget.onTimerDurationChanged(
new TimeSpan(
hours: selectedHour,
minutes: selectedMinute,
seconds: selectedSecond ?? 0));
});
},
children: CupertinoDatePickerUtils.listGenerate(24, (int index) => {
string semanticsLabel = textDirectionFactor == 1
? localizations.timerPickerHour(index) + localizations.timerPickerHourLabel(index)
: localizations.timerPickerHourLabel(index) + localizations.timerPickerHour(index);
return new Semantics(
label: semanticsLabel,
excludeSemantics: true,
child: _buildPickerNumberLabel(localizations.timerPickerHour(index), additionalPadding)
);
})
);
}
Widget _buildHourColumn(EdgeInsetsDirectional additionalPadding) {
return new Stack(
children: new List<Widget>[
new NotificationListener<ScrollEndNotification>(
onNotification: (ScrollEndNotification notification) => {
setState(()=> { lastSelectedHour = selectedHour; });
return false;
},
child: _buildHourPicker(additionalPadding)
),
_buildLabel(
localizations.timerPickerHourLabel(lastSelectedHour ?? selectedHour),
additionalPadding
)
]
);
}///tbc
Widget _buildMinutePicker() {
float offAxisFraction;
switch (widget.mode) {
case CupertinoTimerPickerMode.hm:
offAxisFraction = 0.5f * textDirectionFactor;
break;
case CupertinoTimerPickerMode.hms:
offAxisFraction = 0.0f;
break;
case CupertinoTimerPickerMode.ms:
offAxisFraction = -0.5f * textDirectionFactor;
}
return new CupertinoPicker(
scrollController: new FixedExtentScrollController(
initialItem: (int)(selectedMinute / widget.minuteInterval)
),
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
backgroundColor: widget.backgroundColor,
squeeze: CupertinoDatePickerUtils._kSqueeze,
looping: true,
onSelectedItemChanged: (int index) => {
setState(() => {
selectedMinute = index * widget.minuteInterval;
widget.onTimerDurationChanged(
new TimeSpan(
hours: selectedHour ?? 0,
minutes: selectedMinute,
seconds: selectedSecond ?? 0));
});
},
children: CupertinoDatePickerUtils.listGenerate((int)(60 / widget.minuteInterval), (int index) => {
int minute = index * widget.minuteInterval;
string semanticsLabel = textDirectionFactor == 1
? localizations.timerPickerMinute(minute) + localizations.timerPickerMinuteLabel(minute)
: localizations.timerPickerMinuteLabel(minute) + localizations.timerPickerMinute(minute);
return Semantics(
label: semanticsLabel,
excludeSemantics: true,
child: _buildPickerNumberLabel(localizations.timerPickerMinute(minute), additionalPadding),
);
})
);
}
Widget _buildMinuteColumn(EdgeInsetsDirectional additionalPadding) {
return new Stack(
children: new List<Widget>[
new NotificationListener<ScrollEndNotification>(
onNotification: (ScrollEndNotification notification) => {
setState(() => { lastSelectedMinute = selectedMinute; });
return false;
},
child: _buildMinutePicker(additionalPadding)
),
_buildLabel(
localizations.timerPickerMinuteLabel(lastSelectedMinute ?? selectedMinute),
additionalPadding
)
]
);
}
//////////////////////////////////////////////////////////////////////////////////////////
//Widget _buildSecondPicker() {
Widget _buildSecondPicker(EdgeInsetsDirectional additionalPadding) {
float offAxisFraction = 0.5 * textDirectionFactor; //0.5f ;
float secondPickerWidth = widget.mode == CupertinoTimerPickerMode.ms
? CupertinoDatePickerUtils._kPickerWidth / 10
: CupertinoDatePickerUtils._kPickerWidth / 6;
return new CupertinoPicker(
scrollController: new FixedExtentScrollController(
initialItem: (int)(selectedSecond / widget.secondInterval)
),
offAxisFraction: offAxisFraction,
itemExtent: CupertinoDatePickerUtils._kItemExtent,
backgroundColor: widget.backgroundColor,
squeeze: CupertinoDatePickerUtils._kSqueeze,
looping: true,
onSelectedItemChanged: (int index) => {
setState(() => {
selectedSecond = index * widget.secondInterval;
widget.onTimerDurationChanged(
Duration(
hours: selectedHour ?? 0,
minutes: selectedMinute,
seconds: selectedSecond));
});
},
children: List<Widget>.generate((int)(60 / widget.secondInterval), (int index) => {
int second = index * widget.secondInterval;
string semanticsLabel = textDirectionFactor == 1
? localizations.timerPickerSecond(second) + localizations.timerPickerSecondLabel(second)
: localizations.timerPickerSecondLabel(second) + localizations.timerPickerSecond(second);
return Semantics(
label: semanticsLabel,
excludeSemantics: true,
child: _buildPickerNumberLabel(localizations.timerPickerSecond(second), additionalPadding),
);
}),
);
}
Widget _buildSecondColumn() {
float secondPickerWidth = widget.mode == CupertinoTimerPickerMode.ms
? CupertinoDatePickerUtils._kPickerWidth / 10
: CupertinoDatePickerUtils._kPickerWidth / 6;
Widget secondLabel = new IgnorePointer(
child: new Container(
alignment: alignCenterLeft,
padding: EdgeInsets.only(left: secondPickerWidth),
child: new Container(
alignment: alignCenterLeft,
padding: EdgeInsets.symmetric(horizontal: 2.0f),
child: _buildLabel(localizations.timerPickerSecondLabel(selectedSecond))
)
)
);
return new Stack(
children: new List<Widget> {
_buildSecondPicker(),
secondLabel
}
);
}
public override Widget build(BuildContext context) {
Widget picker;
if (widget.mode == CupertinoTimerPickerMode.hm) {
picker = new Row(
children: new List<Widget> {
new Expanded(child: _buildHourColumn()),
new Expanded(child: _buildMinuteColumn()),
}
);
}
else if (widget.mode == CupertinoTimerPickerMode.ms) {
picker = new Row(
children: new List<Widget> {
new Expanded(child: _buildMinuteColumn()),
new Expanded(child: _buildSecondColumn()),
}
);
}
else {
picker = new Row(
children: new List<Widget> {
new Expanded(child: _buildHourColumn()),
new Container(
width: CupertinoDatePickerUtils._kPickerWidth / 3,
child: _buildMinuteColumn()
),
new Expanded(child: _buildSecondColumn()),
}
);
}
return new MediaQuery(
data: new MediaQueryData(
textScaleFactor: 1.0f
),
child: picker
);
}
}
}*/