ListPicker for Enum [Flags] ?

[Martin]

With the recent introduction of multi list picker I have an idea for another feature. I currently use Enum with [Flags] attribute for storing data user selects. It will be great to have the possibility to edit this Enum value using ListPicker with multiselect.

Typical use:

[Flags]
public enum Recurrence
{
    Monday = 0x1,
    Tuesday = 0x2,
    Wednesday = 0x4,
    Thursday = 0x8,
    Friday = 0x10,
    Saturday = 0x20,
    Sunday = 0x40,
}

[Valentin.Stoychev]

Hi,

Can you please elaborate a little bit more on what do you mean by "edit the enum value"?

Regards,
Valentin.Stoychev
the Telerik team

[Martin]

Well imagine I got this property and I set it to initial value

public Recurrence AlarmRecurrence { get; set; }
AlarmRecurrence = Recurrence.Monday | Recurrence.Wednesday | Recurrence.Sunday;

 

I'd like to have ListPicker for setting the value of my property AlarmRecurrence where user can select the target days using checkboxes just like in the built-in Windows Phone alarm.

Currently the ListPicker works only on list of possible values, selecting one, or on list of possible values, selecting list of values.

[Todor]

Hello Martin,

So, you want your ItemsSource to be the enumeration. Here is how you can convert an enumeration to a List<string>:

List<string> items = new List<string>();
foreach (var x in typeof(Recurrence).GetFields())
{
    if (x.IsLiteral)
    {
        items.Add(x.Name);
    }
}
return items;

Then when the SelectionChanged event occurs you can get the result by something similar to this:

Recurrence result = GetRecurrence(this.listPicker.SelectedItems[0]);
for (int i = 1; i < this.listPicker.SelectedItems.Count; i++)
{
    result |= GetRecurrence(this.listPicker.SelectedItems[i]);
}
return result;

Where GetRecurrence is converting back a string to Recurrence:

private ListPickerExample.ViewModels.MainViewModel.Recurrence GetRecurence(object source)
{
    switch (source.ToString().ToLower())
    {
        case "monday": return Recurrence.Monday;
        case "tuesday": return Recurrence.Tuesday;
        case "wednesday": return Recurrence.Wednesday;
        case "thursday": return Recurrence.Thursday;
        case "friday": return Recurrence.Friday;
        case "saturday": return Recurrence.Saturday;
        case "sunday": return Recurrence.Sunday;
        default: return Recurrence.Monday;
    }
}

I hope this helps. Let me know if you need additional assistance.

Kind regards,
Todor
the Telerik team