using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Security;
using System.Text;
using System.Windows;
using System.Windows.Automation.Provider;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Interop;
using System.Windows.Media;
 
using MS.Internal;
using MS.Win32;
 
namespace System.Windows.Automation.Peers
{
 
    /// 
    public class GridViewHeaderRowPresenterAutomationPeer : FrameworkElementAutomationPeer
    {
        ///
        public GridViewHeaderRowPresenterAutomationPeer(GridViewHeaderRowPresenter owner)
            : base(owner)
        {
        }
 
        ///
        override protected string GetClassNameCore()
        {
            return "GridViewHeaderRowPresenter";
        }
 
        ///
        override protected AutomationControlType GetAutomationControlTypeCore()
        {
            return AutomationControlType.Header;
        }
 
        // AutomationControlType.Header must return IsContentElement false.
        // See http://msdn.microsoft.com/en-us/library/ms753110.aspx
        override protected bool IsContentElementCore()
        {
            return false;
        }
 
        ///
        protected override List<AutomationPeer> GetChildrenCore()
        {
            List<AutomationPeer> list = base.GetChildrenCore();
            List<AutomationPeer> newList = null;
            if (list != null) 
            {
                newList = new List<AutomationPeer>(list.Count);
                //GVHRP contains 2 extra column headers, one is dummy header, the other is floating header
                //We need to remove them from the tree
                foreach (AutomationPeer peer in list)
                {
                    if (peer is UIElementAutomationPeer)
                    {
                        GridViewColumnHeader header = ((UIElementAutomationPeer)peer).Owner as GridViewColumnHeader;
                        if (header != null && header.Role == GridViewColumnHeaderRole.Normal)
                        {
                            //Because GVHRP uses inverse sequence to store column headers, we need to use insert here
                            newList.Insert(0, peer);
                        }
                    }
                }
            }
            return newList;
        }
    }
}