How to: Create a Custom View Mode for a ListView

 

This example shows how to create a custom View mode for a ListView control.

Example

You must use the ViewBase class when you create a custom view for the ListView control. The following example shows a view mode that is called PlainView, which is derived from the ViewBase class.

Public Class PlainView
	Inherits ViewBase

  Public Shared ReadOnly ItemContainerStyleProperty As DependencyProperty = ItemsControl.ItemContainerStyleProperty.AddOwner(GetType(PlainView))

  Public Property ItemContainerStyle() As Style
	  Get
		  Return CType(GetValue(ItemContainerStyleProperty), Style)
	  End Get
	  Set(ByVal value As Style)
		  SetValue(ItemContainerStyleProperty, value)
	  End Set
  End Property

  Public Shared ReadOnly ItemTemplateProperty As DependencyProperty = ItemsControl.ItemTemplateProperty.AddOwner(GetType(PlainView))

  Public Property ItemTemplate() As DataTemplate
	  Get
		  Return CType(GetValue(ItemTemplateProperty), DataTemplate)
	  End Get
	  Set(ByVal value As DataTemplate)
		  SetValue(ItemTemplateProperty, value)
	  End Set
  End Property

  Public Shared ReadOnly ItemWidthProperty As DependencyProperty = WrapPanel.ItemWidthProperty.AddOwner(GetType(PlainView))

  Public Property ItemWidth() As Double
	  Get
		  Return CDbl(GetValue(ItemWidthProperty))
	  End Get
	  Set(ByVal value As Double)
		  SetValue(ItemWidthProperty, value)
	  End Set
  End Property


  Public Shared ReadOnly ItemHeightProperty As DependencyProperty = WrapPanel.ItemHeightProperty.AddOwner(GetType(PlainView))

  Public Property ItemHeight() As Double
	  Get
		  Return CDbl(GetValue(ItemHeightProperty))
	  End Get
	  Set(ByVal value As Double)
		  SetValue(ItemHeightProperty, value)
	  End Set
  End Property


  Protected Overrides ReadOnly Property DefaultStyleKey() As Object
	  Get
		Return New ComponentResourceKey(Me.GetType(), "myPlainViewDSK")
	  End Get
  End Property

End Class

To apply a style to the custom view, use the Style class. The following example defines a Style for the PlainView view mode. In the previous example, this style is set as the value of the DefaultStyleKey property that is defined for PlainView.

<Style x:Key="{ComponentResourceKey 
      TypeInTargetAssembly={x:Type l:PlainView},
      ResourceId=myPlainViewDSK}" 
       TargetType="{x:Type ListView}" 
       BasedOn="{StaticResource {x:Type ListBox}}"
       >
  <Setter Property="HorizontalContentAlignment"
          Value="Center"/>
  <Setter Property="ItemContainerStyle" 
          Value="{Binding (ListView.View).ItemContainerStyle,
          RelativeSource={RelativeSource Self}}"/>
  <Setter Property="ItemTemplate" 
          Value="{Binding (ListView.View).ItemTemplate,
          RelativeSource={RelativeSource Self}}"/>
  <Setter Property="ItemsPanel">
    <Setter.Value>
      <ItemsPanelTemplate>
        <WrapPanel Width="{Binding (FrameworkElement.ActualWidth),
                   RelativeSource={RelativeSource 
                                   AncestorType=ScrollContentPresenter}}"
                   ItemWidth="{Binding (ListView.View).ItemWidth,
                   RelativeSource={RelativeSource AncestorType=ListView}}"
                   MinWidth="{Binding (ListView.View).ItemWidth,
                   RelativeSource={RelativeSource AncestorType=ListView}}"
                   ItemHeight="{Binding (ListView.View).ItemHeight,
                   RelativeSource={RelativeSource AncestorType=ListView}}"/>
      </ItemsPanelTemplate>
    </Setter.Value>
  </Setter>
</Style>

To define the layout of data in a custom view mode, define a DataTemplate object. The following example defines a DataTemplate that can be used to display data in the PlainView view mode.

<DataTemplate x:Key="centralTile">
  <StackPanel Height="100" Width="90">
    <Grid Width="70" Height="70" HorizontalAlignment="Center">
      <Image Source="{Binding XPath=@Image}" Margin="6,6,6,9"/>
    </Grid>
    <TextBlock Text="{Binding XPath=@Name}" FontSize="13" 
               HorizontalAlignment="Center" Margin="0,0,0,1" />
    <TextBlock Text="{Binding XPath=@Type}" FontSize="9" 
               HorizontalAlignment="Center" Margin="0,0,0,1" />
  </StackPanel>
</DataTemplate>

The following example shows how to define a ResourceKey for the PlainView view mode that uses the DataTemplate that is defined in the previous example.

<l:PlainView x:Key="tileView" 
             ItemTemplate="{StaticResource centralTile}" 
             ItemWidth="100"/>

A ListView control can use a custom view if you set the View property to the resource key. The following example shows how to specify PlainView as the view mode for a ListView.

'Set the ListView View property to the tileView custom view
lv.View = TryCast(lv.FindResource("tileView"), ViewBase)

For the complete sample, see ListView with Multiple Views Sample.

Show: