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// 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: Base class for AutomationPeers associated with TextPattern.
//
using System.Windows.Automation.Provider; // IRawElementProviderSimple
using System.Windows.Documents; // ITextPointer
using MS.Internal.Automation; // EventMap
namespace System.Windows.Automation.Peers
{
/// <summary>
/// Base class for AutomationPeers associated with TextPattern.
/// </summary>
public abstract class ContentTextAutomationPeer : FrameworkContentElementAutomationPeer
{
/// <summary>
/// Constructor.
/// </summary>
protected ContentTextAutomationPeer(FrameworkContentElement owner)
: base(owner)
{ }
/// <summary>
/// This method is called by implementation of the peer to raise the automation "ActiveTextPositionChanged" event
/// </summary>
// Never inline, as we don't want to unnecessarily link the automation DLL.
[System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
public virtual void RaiseActiveTextPositionChangedEvent(TextPointer rangeStart, TextPointer rangeEnd)
{
if (EventMap.HasRegisteredEvent(AutomationEvents.ActiveTextPositionChanged))
{
IRawElementProviderSimple provider = ProviderFromPeer(this);
if (provider != null)
{
ActiveTextPositionChangedEventArgs args = new ActiveTextPositionChangedEventArgs(TextRangeFromTextPointers(rangeStart, rangeEnd));
AutomationInteropProvider.RaiseAutomationEvent(
AutomationElementIdentifiers.ActiveTextPositionChangedEvent,
provider,
args);
}
}
}
/// <summary>
/// Convert TextPointers to ITextRangeProvider
/// </summary>
private ITextRangeProvider TextRangeFromTextPointers(TextPointer rangeStart, TextPointer rangeEnd)
{
TextAdaptor textAdaptor = GetPattern(PatternInterface.Text) as TextAdaptor;
return textAdaptor?.TextRangeFromTextPointers(rangeStart, rangeEnd);
}
/// <summary>
/// Maps AutomationPeer to provider object.
/// </summary>
internal new IRawElementProviderSimple ProviderFromPeer(AutomationPeer peer)
{
return base.ProviderFromPeer(peer);
}
/// <summary>
/// Maps automation provider to DependencyObject.
/// </summary>
internal DependencyObject ElementFromProvider(IRawElementProviderSimple provider)
{
DependencyObject element = null;
AutomationPeer peer = PeerFromProvider(provider);
if (peer is UIElementAutomationPeer)
{
element = ((UIElementAutomationPeer)peer).Owner;
}
else if (peer is ContentElementAutomationPeer)
{
element = ((ContentElementAutomationPeer)peer).Owner;
}
return element;
}
/// <summary>
/// Gets collection of AutomationPeers for given text range.
/// </summary>
internal abstract List<AutomationPeer> GetAutomationPeersFromRange(ITextPointer start, ITextPointer end);
}
}
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