// 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 TextBlock.
//
 
using System.Windows.Controls;              // TextBlock
using MS.Internal.Documents;                // TextContainerHelper
 
namespace System.Windows.Automation.Peers
{
    /// <summary>
    /// AutomationPeer associated with TextBlock.
    /// </summary>
    public class TextBlockAutomationPeer : FrameworkElementAutomationPeer
    {
        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="owner">Owner of the AutomationPeer.</param>
        public TextBlockAutomationPeer(TextBlock owner)
            : base(owner)
        { }
 
        /// <summary>
        /// <see cref="AutomationPeer.GetChildrenCore"/>
        /// </summary>
        protected override List<AutomationPeer> GetChildrenCore()
        {
            List<AutomationPeer> peers = null;
            TextBlock owner = (TextBlock)Owner;
            // TextBlock has children only if it has complex content.
            if (owner.HasComplexContent)
            {
                peers = TextContainerHelper.GetAutomationPeersFromRange(owner.TextContainer.Start, owner.TextContainer.End, null);
            }
            return peers;
        }
 
        /// <summary>
        /// <see cref="AutomationPeer.GetAutomationControlTypeCore"/>
        /// </summary>
        protected override AutomationControlType GetAutomationControlTypeCore()
        {
            return AutomationControlType.Text;
        }
 
        /// <summary>
        /// <see cref="AutomationPeer.GetClassNameCore"/>
        /// </summary>
        /// <returns></returns>
        protected override string GetClassNameCore()
        {
            return "TextBlock";
        }
 
        /// <summary>
        /// <see cref="AutomationPeer.IsControlElementCore"/>
        /// </summary>
        override protected bool IsControlElementCore()
        {
            // Return false if TextBlock is part of a ControlTemplate, otherwise return the base method
            TextBlock tb = (TextBlock)Owner;
            DependencyObject templatedParent = tb.TemplatedParent;
 
            // If the templatedParent is a ContentPresenter, this TextBlock is generated from a DataTemplate
            if (templatedParent == null || templatedParent is ContentPresenter)
            {
                return base.IsControlElementCore();
            }
 
            return false;
        }
    }
}