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Change date colors in Rad calendar

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Calendar

This is a migrated thread and some comments may be shown as answers.

20 Answers, 1 is accepted

answered on 06 Nov 2009, 10:46 AM

Hi shraddha,

I don't know if I understood correctly, but when I want to refresh date coloured on runtime, I just update one List and when call a method which consits of these 3 lines:

                    DataTemplateSelector dts = radCalendar1.DayTemplateSelector;         
            radCalendar1.DayTemplateSelector = new DisableWeekendsSelection();         
            radCalendar1.DayTemplateSelector = dts;         

My DataTemplateSelector class gets that List and recolours the dates.

Maybe it's not a perfect solution, but it works and it works fast. :)

answered on 27 Sep 2010, 08:55 PM

Hi Everyone,

I am facing a similar problem. I have like a list of dates that I need to highlight in the calendar. I fetched the list form sql server in the backend and store it in an array of DateTime type in my C# code behind. Its a WPF application. Now I want to keep today's (current) date highlighted as it is, but also want to highlight this list of dates that I am fetching in the radcalendar. I tried adding the list to the SelectedDates property of the radcalendar but it that messes up my OnSelectionChanged event handler. Any solution as to how to highlight a few dates on the calendar?

Thanks

answered on 12 Nov 2010, 11:15 AM

Hi,
Maybe this will help you guys:

The purpose of these attached properties are to select a template for special days (like for example bold the days of the month that have appointments or color holidays from a database). MVVM friendly.

In the viewmdodel we have:

private List<DateTime> _datesWithAppointments;

public List<DateTime> DatesWithAppointments

{

get

{

return _datesWithAppointments;

}

set

{

if (_datesWithAppointments != value)

{

_datesWithAppointments = value;

NotifyPropertyChanged("DatesWithAppointments");

}

We populate these dates:

DatesWithAppointments = Appointments.Select(x => x.Start.Date).ToList();

in xaml we have the datatemplate for special days:

<DataTemplate x:Key="SpecialDayTemplate">

<TextBlock Text="{Binding Text}" FontWeight="Bold" />

</DataTemplate>

and the RadCalendar is defined in xaml:

<telerik:RadCalendar Margin="0,10,0,0" x:Name="radCalendar" VerticalAlignment="Top" DisplayDate="{Binding MySelectedDate}" SelectedDate="{Binding MySelectedDate, Mode=TwoWay}" telerik:StyleManager.Theme="Office_Blue" local:RadCalendarBehavior.SpecialDayTemplate="{StaticResource SpecialDayTemplate}" local:RadCalendarBehavior.SpecialDays="{Binding DatesWithAppointments}" />

The final pieces of the puzzle are the custom daytemplateselector and the attached properties:

public class SpecialDaySelector : DataTemplateSelector

{

private List<DateTime> _specialDates;

private DataTemplate _specialDayTemplate { get; set; }

public SpecialDaySelector(List<DateTime> specialDates, DataTemplate specialDayTemplate)

{

_specialDates = specialDates;

_specialDayTemplate = specialDayTemplate;

}

public override DataTemplate SelectTemplate(object item, DependencyObject container)

{

var content = item as CalendarButtonContent;

if (content != null)

{

if (_specialDates.Contains(content.Date))

{

return _specialDayTemplate;

}

return base.SelectTemplate(item, container);

}

public class RadCalendarBehavior : DependencyObject

{

private static void OnSpecialDaysChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)

{

var calendar = d as RadCalendar;

if (e.NewValue != null)

{

calendar.DayTemplateSelector = new SpecialDaySelector((List<DateTime>)e.NewValue, GetSpecialDayTemplate(d));

}

public static List<DateTime> GetSpecialDays(DependencyObject obj)

{

return (List<DateTime>)obj.GetValue(SpecialDaysProperty);

}

public static void SetSpecialDays(DependencyObject obj, List<DateTime> value)

{

obj.SetValue(SpecialDaysProperty, value);

}

public static readonly DependencyProperty SpecialDaysProperty =

DependencyProperty.RegisterAttached("SpecialDays", typeof(List<DateTime>), typeof(RadCalendarBehavior), new UIPropertyMetadata(null, OnSpecialDaysChanged));

public static DataTemplate GetSpecialDayTemplate(DependencyObject obj)

{

return (DataTemplate)obj.GetValue(SpecialDayTemplateProperty);

}

public static void SetSpecialDayTemplate(DependencyObject obj, DataTemplate value)

{

obj.SetValue(SpecialDayTemplateProperty, value);

}

public static readonly DependencyProperty SpecialDayTemplateProperty =

DependencyProperty.RegisterAttached("SpecialDayTemplate", typeof(DataTemplate), typeof(RadCalendarBehavior), new UIPropertyMetadata(null));

}

Hope it helps.