[Bug] Clearing a DatePickerField doesn't allow you to pick the same date without changing it first

[BinaryAssault]

Using the following steps, you will see that the DatePickerField will not allow you to reselect the same date after clearing it:

1. In a DatePickerField, select some date
2. Clear the date via the clear 'X' button
3. Reselect the same date
4. Notice that the new date is not in the DatePickerField

Edit --
This is also true when nothing is selected and you attempt to select today's date.

[enisn]

This is strange behavior. I found the reason but hadn't seen any solution yet.

[StepKie]

I found the reason but hadn't seen any solution yet.

Can you shed some light as to what you found the reason to be, and what the problem is (i.e., why is it stuck?). This is still affecting us...

Alternatively, any workarounds?

Thanks.

[enisn]

Since it uses default MAUI datepicker, clearing works only on the UI side. The original datepicker still keeps the date because it doesn't support null values. I'll try add some native code with Custom Handlers to overcome this issue.

Content of the DatePickerField is a regular MAUI DatePicker

https://github.com/enisn/UraniumUI/blob/cc0928368057de92601cef3020bc9a49cb862dbc/src/UraniumUI.Material/Controls/DatePickerField.cs#LL13C62-L13C62

[StepKie]

I just wanted to give this issue a gentle bump. ;)

This is still the case and observable in the demo DatePickerFieldPage, where Date is initially null, and cannot even be set to the current date by invoking the picker and clicking ok.

[lamotuab]

I have an issue where the initial value is displayed, with a low opacity, behind the title until a new value is selected. XAML code is as follows:

                    <material:DatePickerField
                        Date="{Binding OpeningBalance.Date, Mode=TwoWay}"
                        Format="dd-MMM-yy"
                        Title="Date"
                        WidthRequest="150" >
                        <validation:RequiredValidation />
                    </material:DatePickerField>

Is this related to this issue or something different?

[dean-toolhound]

Regarding the original bug, it is the Maui DatePicker that is the issue. This issue has been open for over a year without resolution - [(https://github.com/dotnet/maui/issues/13156)].

There is a work around mentioned in the issue that could be implemented here.

 public class FormDatePicker : Microsoft.Maui.Controls.DatePicker, IDatePicker
 {
     DateTime IDatePicker.Date
     {
         get => Date;
         set
         {
             if (value.Equals(DateTime.Today.Date))
                 Date = value.AddDays(-1);
             Date = value;
             OnPropertyChanged(nameof(Date));
         }
     }
 }

[StepKie]

@enisn I created a pull request, please take a look. Tested successfully in UraniumApp.

edit: I also requested it to be considered again in dotnet/maui#13156, since this is not really a desirable state.

[enisn]

Thanks for your contribution, I'll check as soon as possible and try to release it quickly after merged