ViewBase Class

Represents the base class for views that define the appearance of data in a ListView control.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

public abstract class ViewBase : DependencyObject
This class is abstract; see Inheritance Hierarchy for derived non-abstract classes usable in XAML.

The GridView view mode is derived from the ViewBase class. You typically use a GridView with the ListView control to lay out data in columns. You can also use the ViewBase class to create custom view modes for a ListView.

The View property defines the view mode that the ListView control uses.

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

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 : ViewBase
{    

  public static readonly DependencyProperty 
    ItemContainerStyleProperty =
    ItemsControl.ItemContainerStyleProperty.AddOwner(typeof(PlainView));

  public Style ItemContainerStyle
  {
      get { return (Style)GetValue(ItemContainerStyleProperty); }
      set { SetValue(ItemContainerStyleProperty, value); }
  }

  public static readonly DependencyProperty ItemTemplateProperty =
      ItemsControl.ItemTemplateProperty.AddOwner(typeof(PlainView));

  public DataTemplate ItemTemplate
  {
      get { return (DataTemplate)GetValue(ItemTemplateProperty); }
      set { SetValue(ItemTemplateProperty, value); }
  }

  public static readonly DependencyProperty ItemWidthProperty =
      WrapPanel.ItemWidthProperty.AddOwner(typeof(PlainView));

  public double ItemWidth
  {
      get { return (double)GetValue(ItemWidthProperty); }           
      set { SetValue(ItemWidthProperty, value); }
  }


  public static readonly DependencyProperty ItemHeightProperty =
      WrapPanel.ItemHeightProperty.AddOwner(typeof(PlainView));

  public double ItemHeight
  {
      get { return (double)GetValue(ItemHeightProperty); }
      set { SetValue(ItemHeightProperty, value); }
  }


  protected override object DefaultStyleKey
  {
      get 
      { 
        return new ComponentResourceKey(GetType(), "myPlainViewDSK"); 
      }
  }

}

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 = lv.FindResource("tileView") as ViewBase;

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

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0
Was this page helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

ADD
Show:
© 2014 Microsoft