Home / Community & Support / Developer Productivity Tools Forums / WPF > PanelBar > RadPanelBarItem Template Selector

• Joseph

  Posted on Nov 3, 2011 (permalink)

  I have a template selector that I would like to work with the RadPanelBarItem items presenter. Unfortunatley the template is never called. I am doing the following:

  <telerik:RadPanelBar Grid.Row="1" x:Name="PART_RAD_PANEL_BAR" Margin="5,5,0,0" ItemsSource="{Binding UpdateSourceTrigger=PropertyChanged, Path=ExperimentCollection.ExperimentTriggerCollection, NotifyOnSourceUpdated=True}" >             

  </telerik:RadPanelBar>

  And am using the following Style for the RadPanelBarItem (Cut for brevity)

  <Style x:Key="PanelBarItemKey" TargetType="{x:Type telerik:RadPanelBarItem}">

      <Setter Property="Background">

          <Setter.Value>

              <LinearGradientBrush EndPoint="0.5,1"

                                   StartPoint="0.5,0">

                  <GradientStop Color="White" />

                  <GradientStop Color="Gainsboro"

                                Offset="0.43" />

                  <GradientStop Color="#FFADADAD"

                                Offset="0.44" />

                  <GradientStop Color="#FFD4D4D4"

                                Offset="1" />

              </LinearGradientBrush>

          </Setter.Value>

      </Setter>

      <Setter Property="BorderBrush"

              Value="#FF848484" />

      <Setter Property="BorderThickness"

              Value="1" />

      <Setter Property="Foreground"

              Value="Black" />

      <Setter Property="Padding"

              Value="3" />

      <Setter Property="HorizontalContentAlignment"

              Value="Stretch" />

      <Setter Property="VerticalContentAlignment"

              Value="Stretch" />

      <Setter Property="HeaderTemplate"

              Value="{StaticResource PanelBarItemTemplate}" />

      <Setter Property="ItemsSource"

              Value="{Binding SelectedTrigger}" />

      <Setter Property="ItemTemplateSelector"

              Value="{StaticResource TriggerTemplateSelectorKey}" />

      <Setter Property="ChildItemsTemplate">

  
  And the following Template Selector:
  
  

  Public Class TriggerTemplateSelector

      Inherits DataTemplateSelector

   

      Public Overrides Function SelectTemplate(ByVal item As Object, ByVal container As DependencyObject) As DataTemplate

   

          If item IsNot Nothing Then

   

              Dim et As ExperimentTrigger = CType(item, ExperimentTrigger)

   

              Dim element As FrameworkElement

              element = TryCast(container, FrameworkElement)

   

              Select Case et.TriggerType

                  Case "Timer"

                      Return TryCast(element.FindResource("TimerTriggerTemplate"), DataTemplate)

                  Case "Damage"

                      Return TryCast(element.FindResource("TriggerDamageTemplate"), DataTemplate)

                  Case "IED Detonation"

                      Return TryCast(element.FindResource("TriggerDetonationTemplate"), DataTemplate)

              End Select

   

          Else

              Return Nothing

          End If

   

          Return Nothing

   

      End Function

  End Class

  The Items in the RadPanelBarItems need to call the template selector which I thought would be called by setting the ItemTemplateSelector in the Style, but this does not seem to be the case. How can I call my template selector in the RadPanelBarItem Style?
  
  I am using the following to link to further illustrate.
  
  If I do the following in XAML the template selector is called but I don't know how many RadPabelBarItems I will have:
  
  

  <telerik:RadPanelBar Grid.Row="1"

                       Margin="5,5,0,0"

                       >

   

      <telerik:RadPanelBarItem Header="Test"

                               Style="{x:Null}"

                               ItemTemplateSelector="{StaticResource TriggerTemplateSelectorKey}"

                               ItemsSource="{Binding UpdateSourceTrigger=PropertyChanged, Path=ExperimentCollection.ExperimentTriggerCollection, NotifyOnSourceUpdated=True}" />

  </telerik:RadPanelBar>

  
  I have not had any luck with this so I am currently trying to do it procedurally. Is this possible to do this in XAML?
  
  Regards,
  Joseph

  Reply

• Tina Stancheva Tina Stancheva

  Posted on Nov 8, 2011 (permalink)

  Hi Joseph,
  
  Since you're binding the RadPanelBar ItemsSource collection ans you need to call the ItemTemplateSelector for each RadPanelBarItem you can set the ItemTemplateSelector property in the RadPanelBar definition. Basically when you set it in the RadPanelBarItemStyle it will be called for the children Items collection of each item but not for the root items and since there is no ItemTemplate defined for the root items - the control won't know that they ave children and won't look for their ItemTemplate.
  
  Please try this:
  

  <telerik:RadPanelBar Grid.Row="1"

  x:Name="PART_RAD_PANEL_BAR" Margin="5,5,0,0"

  ItemsSource="{Binding UpdateSourceTrigger=PropertyChanged, Path=ExperimentCollection.ExperimentTriggerCollection, NotifyOnSourceUpdated=True}"

  ItemTemplateSelector="{StaticResource TriggerTemplateSelectorKey}">            

  </telerik:RadPanelBar>

  and let us know if it works for you.
  
  All the best,
  Tina Stancheva
  the Telerik team

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Reply

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