IViewAutomationPeer Interface
Collapse the table of content
Expand the table of content

IViewAutomationPeer Interface


Allows a customized view of a ListView that derives from ViewBase to implement automation peer features that are specific to the custom view.

Namespace:   System.Windows.Automation.Peers
Assembly:  PresentationFramework (in PresentationFramework.dll)

public interface IViewAutomationPeer


Creates a new instance of the ItemAutomationPeer class.


Gets the control type for the element that is associated with this IViewAutomationPeer.


Gets the collection of immediate child elements of the specified UI Automation peer.


Gets the control pattern that is associated with the specified patternInterface.


Called by ListView when the collection of items changes.


Called when the custom view is no longer applied to the ListView.

The following code shows a custom view implementing IViewAutomationPeer in a separate class to handle a button that appears at the top of the ListView control.

public class OneButtonHeaderView : ViewBase
    protected override IViewAutomationPeer GetAutomationPeer(ListView parent)
        return new OneButtonHeaderViewAutomationPeer( this, parent );
public class OneButtonHeaderViewAutomationPeer : IViewAutomationPeer
    ListView m_lv;

    public OneButtonHeaderViewAutomationPeer(OneButtonHeaderView control, ListView parent)
        m_lv = parent;

    ItemAutomationPeer IViewAutomationPeer.CreateItemAutomationPeer(Object item)
        ListViewAutomationPeer lvAP = UIElementAutomationPeer.FromElement(m_lv) as ListViewAutomationPeer;
        return new ListBoxItemAutomationPeer(item, lvAP);

    AutomationControlType IViewAutomationPeer.GetAutomationControlType()
        return AutomationControlType.List;

    List<AutomationPeer> IViewAutomationPeer.GetChildren(List<AutomationPeer> children)
        // the children parameter is a list of automation peers for all the known items
        // our view must add its banner button peer to this list.

        Button b = (Button)m_lv.Template.FindName("BannerButton", m_lv);
        AutomationPeer peer = UIElementAutomationPeer.CreatePeerForElement(b);

        //If children is null, we still need to create an empty list to insert the button
        if (children == null)
            children = new List<AutomationPeer>();

        children.Insert(0, peer);

        return children;

    Object IViewAutomationPeer.GetPattern(PatternInterface patternInterface)
        // we can invoke the banner button 
        if (patternInterface == PatternInterface.Invoke)
            Button b = (Button)m_lv.Template.FindName("BannerButton", m_lv);
            AutomationPeer peer = UIElementAutomationPeer.FromElement(b);
            if (peer != null)
                return peer;

        // if this view does not have special handling for the pattern interface, return null
        // the ListViewAutomationPeer.GetPattern default handling will be used.
        return null;

    void IViewAutomationPeer.ItemsChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e) { }

    void IViewAutomationPeer.ViewDetached() { }

.NET Framework
Available since 3.0
Return to top
© 2015 Microsoft