// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
// Description: AutomationPeer associated with DocumentViewerBase.
//
using System.Windows.Controls.Primitives; // DocumentViewerBase
using System.Windows.Documents; // IDocumentPaginatorSource
namespace System.Windows.Automation.Peers
{
/// <summary>
/// AutomationPeer associated with DocumentViewerBase.
/// </summary>
public class DocumentViewerBaseAutomationPeer : FrameworkElementAutomationPeer
{
/// <summary>
/// Constructor.
/// </summary>
/// <param name="owner">Owner of the AutomationPeer.</param>
public DocumentViewerBaseAutomationPeer(DocumentViewerBase owner)
: base(owner)
{ }
/// <summary>
/// <see cref="AutomationPeer.GetPattern"/>
/// </summary>
public override object GetPattern(PatternInterface patternInterface)
{
object returnValue = null;
if (patternInterface == PatternInterface.Text)
{
// Make sure that Automation children are created.
this.GetChildren();
// Re-expose TextPattern from hosted document.
if (_documentPeer != null)
{
_documentPeer.EventsSource = this;
returnValue = _documentPeer.GetPattern(patternInterface);
}
}
else
{
returnValue = base.GetPattern(patternInterface);
}
return returnValue;
}
/// <summary>
/// <see cref="AutomationPeer.GetChildrenCore"/>
/// </summary>
/// <remarks>
/// AutomationPeer associated with DocumentViewerBase returns an AutomationPeer
/// for hosted Document and for elements in the style.
/// </remarks>
protected override List<AutomationPeer> GetChildrenCore()
{
// Get children for all elements in the style.
List<AutomationPeer> children = base.GetChildrenCore();
// Add AutomationPeer associated with the document.
// Make it the first child of the collection.
AutomationPeer documentPeer = GetDocumentAutomationPeer();
if (_documentPeer != documentPeer)
{
if (_documentPeer != null)
{
_documentPeer.OnDisconnected();
}
_documentPeer = documentPeer as DocumentAutomationPeer;
}
if (documentPeer != null)
{
if (children == null)
{
children = new List<AutomationPeer>();
}
children.Add(documentPeer);
}
return children;
}
/// <summary>
/// <see cref="AutomationPeer.GetAutomationControlTypeCore"/>
/// </summary>
protected override AutomationControlType GetAutomationControlTypeCore()
{
return AutomationControlType.Document;
}
/// <summary>
/// <see cref="AutomationPeer.GetClassNameCore"/>
/// </summary>
protected override string GetClassNameCore()
{
return "DocumentViewer";
}
/// <summary>
/// Retrieves AutomationPeer for the document.
/// </summary>
/// <returns></returns>
private AutomationPeer GetDocumentAutomationPeer()
{
AutomationPeer documentPeer = null;
IDocumentPaginatorSource document = ((DocumentViewerBase)Owner).Document;
if (document != null)
{
if (document is UIElement)
{
documentPeer = UIElementAutomationPeer.CreatePeerForElement((UIElement)document);
}
else if (document is ContentElement)
{
documentPeer = ContentElementAutomationPeer.CreatePeerForElement((ContentElement)document);
}
}
return documentPeer;
}
private DocumentAutomationPeer _documentPeer;
}
}
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