RadControls for WPF

The RadTimeline control can be used with great success with the Model-View-ViewModel (MVVM) pattern. This help topic will demonstrate how to bind the control with the pattern.

1. We'll get started with a class with two properties - Duration and Date. They will be used to represent the two types of items in the Timeline. We'll also need a method that will set values to the newly created properties and will return a collection of our business objects.
   CopyC#

   public class Product
   {
       public TimeSpan Duration { get; set; }
       public DateTime Date { get; set; }
   
       public static ObservableCollection<Product> GetData(int count)
       {
           var startDate = new DateTime(2010, 1, 1);
           var endDate = new DateTime(2012, 2, 1);
           Random r = new Random();
           ObservableCollection<Product> result = new ObservableCollection<Product>();
   
           for (DateTime i = startDate; i < endDate; i = i.AddMonths(1))
           {
               result.Add(new Product() { Date = i, Duration = TimeSpan.FromDays(r.Next(50, 100))} );
           }
   
           for (int i = 0; i < 15; i++)
           {
               result.Add(new Product()
               {
                   Date = startDate.AddMonths(r.Next(0, 25)).AddDays(15)
               });
           }
   
           return result;
       }
   }

   CopyVB.NET

   Public Class Product
       Public Property Duration() As TimeSpan
       Public Property [Date]() As Date
   
       Public Shared Function GetData(ByVal count As Integer) As ObservableCollection(Of Product)
           Dim startDate = New Date(2010, 1, 1)
           Dim endDate = New Date(2012, 2, 1)
           Dim r As New Random()
           Dim result As New ObservableCollection(Of Product)()
   
           Dim i As Date = startDate
           Do While i < endDate
               result.Add(New Product() With {.Date = i, .Duration = TimeSpan.FromDays(r.Next(50, 100))})
               i = i.AddMonths(1)
           Loop
   
           For i As Integer = 0 To 14
               result.Add(New Product() With {.Date = startDate.AddMonths(r.Next(0, 25)).AddDays(15)})
           Next i
   
           Return result
       End Function
   End Class

2. Create new class that inherits the ViewModelBase abstract class. This will be your ViewModel. What we'll need to add in it - an ObservableCollection that will be used as data source. In the constructor of the class call the GetData method we created in our Product class. (check Step 1.) The parameter of the method will represent the number of items in the timeline.

   Note
   ViewModelBase class is part of the Telerik.Windows.Controls.dll

   CopyC#

   public class ExampleViewModel : ViewModelBase
   {
       private ObservableCollection<Product> _data;
       public ObservableCollection<Product> Data
       {
           get
           {
               return this._data;
           }
           set
           {
               if (this._data != value)
               {
                   this._data = value;
                   this.OnPropertyChanged("Data");
               }
           }
       }
   
       public ExampleViewModel()
       {
           this.Data = Product.GetData(15);
       }
   }

   CopyVB.NET

   Public Class ExampleViewModel
       Inherits ViewModelBase
           Private _data As ObservableCollection(Of Product)
           Public Property Data() As ObservableCollection(Of Product)
               Get
                   Return Me._data
               End Get
               Set(ByVal value As ObservableCollection(Of Product))
                   If Me._data IsNot value Then
                       Me._data = value
                       Me.OnPropertyChanged("Data")
                   End If
               End Set
           End Property
   
           Public Sub New()
               Me.Data = Product.GetData(15)
           End Sub
   End Class

3. Add new RadTimeline declarations in XAML and bind the StartPath and DurationPath properties. To learn more about these properties, please check the DataBinding topic:

   CopyXAML

   <telerik:RadTimeline Height="250" x:Name="RadTimeline1"
                       VerticalAlignment="Top"
                       Margin="6"
                       PeriodStart="2011/01/01" PeriodEnd="2011/06/01"
                       StartPath="Date"
                       DurationPath="Duration"                
                       ItemsSource="{Binding Data}">
               <telerik:RadTimeline.Intervals>
                   <telerik:YearInterval />
                   <telerik:MonthInterval />
                   <telerik:WeekInterval />
                   <telerik:DayInterval />
               </telerik:RadTimeline.Intervals>
           </telerik:RadTimeline>