feat(cupertino): Add selectableDayPredicate parameter to CupertinoDatePicker for selectable day control #171332 #171334

koukibadr · 2025-06-28T11:19:47Z

Description

This PR enhances the CupertinoDatePicker by introducing a weekType parameter, giving developers more control over which days users can select.

Solution

To address this, I've added a new weekType parameter to the CupertinoDatePicker widget. This parameter offers a declarative way to control the set of selectable days displayed in the picker, with options defined in a new WeekType enum:

WeekType.workDays (Monday-Friday)

WeekType.weekends (Saturday-Sunday)

WeekType.fullWeek (all days, current default behavior)

WeekType.custom (allows developers to provide a List representing the DateTime.weekday values that should be visible and selectable).

Example

// Example: Display only work days (Monday-Friday)
CupertinoDatePicker(
  mode: CupertinoDatePickerMode.date,
  initialDateTime: DateTime.now(),
  minimumDate: DateTime(2023, 1, 1),
  maximumDate: DateTime(2024, 12, 31),
  weekType: WeekType.workDays,
  onDateTimeChanged: (DateTime newDateTime) {
    // Handle date change
  },
);

Screenshots

workdays_display.mov

weekend_display.mov

custom_weekdays.mov

Here's the linked issue to this PR #171332

Pre-launch Checklist

I read the Contributor Guide and followed the process outlined there for submitting PRs.
I read the Tree Hygiene wiki page, which explains my responsibilities.
I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
I signed the CLA.
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is test-exempt.
I followed the breaking change policy and added Data Driven Fixes where supported.
All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

alex-medinsh · 2025-06-28T12:41:36Z

Hi @koukibadr! I think the API can be simplified by removing the weekType parameter and enum altogether and allowing the developer to just specify customWeekDays? It will then default to all 7 days and we can then have static presets, something like:

  static const List<int> weekends = [
    DateTime.saturday, 
    DateTime.sunday
  ];

  static const List<int> workDays = [
    DateTime.monday,
    DateTime.tuesday,
    DateTime.wednesday,
    DateTime.thursday,
    DateTime.friday,
  ];

It seems to me that it will help simplify the implementation as well. What do you think?

koukibadr · 2025-06-28T14:35:14Z

Hi @koukibadr! I think the API can be simplified by removing the weekType parameter and enum altogether and allowing the developer to just specify customWeekDays? It will then default to all 7 days and we can then have static presets, something like:
  static const List<int> weekends = [
    DateTime.saturday, 
    DateTime.sunday
  ];

  static const List<int> workDays = [
    DateTime.monday,
    DateTime.tuesday,
    DateTime.wednesday,
    DateTime.thursday,
    DateTime.friday,
  ];
It seems to me that it will help simplify the implementation as well. What do you think?

@alex-medinsh yes it would be more cleaner I agree, but how developers will use presets ? it should be part of the CupertinoDatePIcker class right ?

victorsanni · 2025-06-30T18:13:04Z

Hi @koukibadr! I think the API can be simplified by removing the weekType parameter and enum altogether and allowing the developer to just specify customWeekDays? It will then default to all 7 days and we can then have static presets, something like:

Talking with @MitchellGoodwin offline we think an even more general API can solve this problem and provide more control to developers. For example, a bool callback with a DateTime date arg that returns true if the date should be enabled or not. @alex-medinsh @koukibadr what do you think?

alex-medinsh · 2025-06-30T18:26:39Z

it should be part of the CupertinoDatePIcker class right ?

@koukibadr Initially I was thinking yes, but I am not sure how clean that is.

For example, a bool callback with a DateTime date arg that returns true if the date should be enabled or not.

@victorsanni Does the callback get the currently selected value as the argument? I think this can a bit strange in terms of the UX, since user can select any date and only then will it evaluate if it is selectable. Or did I misunderstand what you were suggesting?

~~What I think this PR is trying to accomplish is something akin to minimumDate and maximumDate, but with weekdays, where the user doesn't even see the disabled options.~~

Nevermind. The callback seems like a nice solution. :)

MitchellGoodwin · 2025-06-30T18:27:01Z

The Material date picker has a similar way of validating dates through selectableDayPredicate. A callback is a bit more flexible compared to a list when the list has to be made dynamic anyway through things like valid dates depend on outside logic or localization.

how developers will use presets ? it should be part of the CupertinoDatePIcker class right ?
Theoretically an enum of default callbacks could be provided, but I worry that it would be difficult to iterate on this enum. There's also localizations concerns. For instance "workDays" isn't valid for a lot of people, if the targets of the app work weekends, or it's in a culture that has a different work week, it loses relevance quickly.

koukibadr · 2025-06-30T21:27:01Z

The Material date picker has a similar way of validating dates through selectableDayPredicate. A callback is a bit more flexible compared to a list when the list has to be made dynamic anyway through things like valid dates depend on outside logic or localization.

how developers will use presets ? it should be part of the CupertinoDatePIcker class right ?
Theoretically an enum of default callbacks could be provided, but I worry that it would be difficult to iterate on this enum. There's also localizations concerns. For instance "workDays" isn't valid for a lot of people, if the targets of the app work weekends, or it's in a culture that has a different work week, it loses relevance quickly.

@victorsanni @alex-medinsh @MitchellGoodwin Okay it make sense especially following the same logic as material design date picker, I'll update the implementation then
thanks for these clarifications

victorsanni · 2025-07-07T20:31:28Z

packages/flutter/lib/src/cupertino/date_picker.dart

 const double _kTimerPickerColumnIntrinsicWidth = 106;

+/// Signature for predicating dates for enabled date selections.
+typedef SelectableDayPredicate = bool Function(DateTime date);


This typedef is already defined in material/date.dart. Can we move some logic in that file to widgets/ and share it here?

I thought that date.dart is related to specific Material DatePickers but yes we can refactor to have only one SelectableDayPredicate makes more sense

@koukibadr Do you plan to make this refactor? Just want to make sure we're on the same page. (from triage)

Hello @dkwingsmt yes I'm back working on this just need to verify other Material DateTime features to not break anything with this refactor

Awesome. Take your time!

victorsanni

Hi @koukibadr. Can you resolve the merge conflicts, rebase, and change the title of the PR to match the latest changes?

koukibadr · 2025-08-02T16:56:18Z

@victorsanni
Okay I'll update my branch then

fluttergithubbot · 2025-08-09T08:24:36Z

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koukibadr · 2025-08-09T08:46:18Z

@victorsanni I've resolved the conflict and rebased latest master branch

victorsanni · 2025-08-11T19:34:17Z

Hi @koukibadr, can you run dart format packages/flutter/lib/src/cupertino/date_picker.dart to fix the failing Linux analyze test? The other failing test is a bot timeout which should be corrected once you push the formatting changes.

packages/flutter/lib/src/cupertino/date_picker.dart

packages/flutter/lib/src/widgets/actions.dart

packages/flutter/lib/src/widgets/date.dart

victorsanni · 2025-08-18T21:31:50Z

packages/flutter/lib/src/cupertino/date_picker.dart

+       ),
+       assert(
+         selectableDayPredicate == null ||
+             selectableDayPredicate(initialDateTime ?? DateTime.now()),


Not sure DateTime.now() should be used here. What about

selectableDayPredicate == null || initialDate == null || selectableDayPredicate!(this.initialDate!)

like in DatePicker?

victorsanni · 2025-08-18T21:34:38Z

packages/flutter/lib/src/cupertino/date_picker.dart

+          final bool isValidDate;
+          if (widget.selectableDayPredicate == null) {
+            isValidDate = true;
+          } else {
+            isValidDate = widget.selectableDayPredicate!.call(rangeStart);
+          }


Replace with a method:

bool _isSelectable(DateTime date) { return widget.selectableDayPredicate?.call(date) ?? true; }

and call it with rangeStart:

victorsanni · 2025-08-18T21:35:28Z

packages/flutter/lib/src/cupertino/date_picker.dart

-          return itemPositioningBuilder(context, Text(dateText, style: _themeTextStyle(context)));
+          return itemPositioningBuilder(
+            context,
+            Text(dateText, style: _themeTextStyle(context, isValid: isValidDate)),


Suggested change

Text(dateText, style: _themeTextStyle(context, isValid: isValidDate)),

Text(dateText, style: _themeTextStyle(context, isValid: _isSelectable(rangeStart)),

victorsanni · 2025-08-18T21:36:38Z

packages/flutter/lib/src/cupertino/date_picker.dart

+    final DateTime selectedDate = selectedDateTime;
+    final bool minCheck = widget.minimumDate?.isAfter(selectedDate) ?? false;
+
+    if (widget.selectableDayPredicate?.call(selectedDate) == false) {


_isSelectable can be used here as well. If needed, the function can be defined outside of any classes and pass in widget.selectableDayPredicate.

packages/flutter/lib/src/widgets/date.dart

packages/flutter/lib/src/cupertino/date_picker.dart

victorsanni

LGTM once comments are addressed.

MitchellGoodwin · 2025-09-03T20:36:17Z

@koukibadr it looks like analyzer checks are failing for null check operators. Can you resolve them? The failures are in the Linux analyze check.

koukibadr · 2025-09-03T20:37:36Z

@koukibadr it looks like analyzer checks are failing for null check operators. Can you resolve them? The failures are in the Linux analyze check.

I'll check them

koukibadr · 2025-09-11T11:28:51Z

@MitchellGoodwin I've updated the PR can you check again ?

dkwingsmt

LGTM, thank you!

packages/flutter/lib/src/cupertino/date_picker.dart

MitchellGoodwin

LGTM as well!

…y control

…ertino DatePicker

Co-authored-by: Victor Sanni <victorsanniay@gmail.com>

…rtinoDatePicker for selectable day control #171332 (flutter/flutter#171334)

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…rtinoDatePicker for selectable day control #171332 (flutter/flutter#171334)

…ePicker for selectable day control flutter#171332 (flutter#171334) ### Description This PR enhances the CupertinoDatePicker by introducing a weekType parameter, giving developers more control over which days users can select. ### Solution To address this, I've added a new weekType parameter to the CupertinoDatePicker widget. This parameter offers a declarative way to control the set of selectable days displayed in the picker, with options defined in a new WeekType enum: WeekType.workDays (Monday-Friday) WeekType.weekends (Saturday-Sunday) WeekType.fullWeek (all days, current default behavior) WeekType.custom (allows developers to provide a List<int> representing the DateTime.weekday values that should be visible and selectable). ### Example ```dart // Example: Display only work days (Monday-Friday) CupertinoDatePicker( mode: CupertinoDatePickerMode.date, initialDateTime: DateTime.now(), minimumDate: DateTime(2023, 1, 1), maximumDate: DateTime(2024, 12, 31), weekType: WeekType.workDays, onDateTimeChanged: (DateTime newDateTime) { // Handle date change }, ); ``` ### Screenshots https://github.com/user-attachments/assets/8b1290c9-0d01-4199-921a-f86cd9d281a5 https://github.com/user-attachments/assets/e2bc4d6a-889e-4a47-89bc-535d7f57c04e https://github.com/user-attachments/assets/475fa1e1-a56a-4a15-945d-890bb1ff51da Here's the linked issue to this PR flutter#171332 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord].  [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md --------- Co-authored-by: Victor Sanni <victorsanniay@gmail.com>

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Adding week type to the CupertinoDatePicker #171332

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dkwingsmt changed the title ~~feat(cupertino): Add weekType parameter to CupertinoDatePicker for selectable day control #171332~~ feat(cupertino): Add selectableDayPredicate parameter to CupertinoDatePicker for selectable day control #171332 Sep 5, 2025

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koukibadr and others added 5 commits September 23, 2025 11:33

feat: Add weekType parameter to CupertinoDatePicker for selectable da…

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…y control

feat: Add weekType parameter to CupertinoDatePicker for selectable da…

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…y control

feat #171332: implement selectableDatePredicate date selection in Cup…

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…ertino DatePicker

feat #171332: implement selectableDatePredicate date selection in Cup…

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…ertino DatePicker

Update packages/flutter/lib/src/cupertino/date_picker.dart

5d60bae

Co-authored-by: Victor Sanni <victorsanniay@gmail.com>

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d5b7f24 feat(cupertino): Add selectableDayPredicate parameter to Cupe…

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…rtinoDatePicker for selectable day control #171332 (flutter/flutter#171334)

	Text(dateText, style: _themeTextStyle(context, isValid: isValidDate)),
	Text(dateText, style: _themeTextStyle(context, isValid: _isSelectable(rangeStart)),

feat(cupertino): Add selectableDayPredicate parameter to CupertinoDatePicker for selectable day control #171332 #171334

feat(cupertino): Add selectableDayPredicate parameter to CupertinoDatePicker for selectable day control #171332 #171334

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koukibadr commented Jun 28, 2025 •

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alex-medinsh commented Jun 30, 2025 •

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MitchellGoodwin commented Jun 30, 2025 •

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