GroupItemAutomationPeer.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Automation / Peers / GroupItemAutomationPeer.cs / 1 / GroupItemAutomationPeer.cs
                        

                        
                            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.Data;
using System.Windows.Interop;
using System.Windows.Media;
 
using MS.Internal;
using MS.Win32; 
 
namespace System.Windows.Automation.Peers
{ 
    ///
    public class GroupItemAutomationPeer : FrameworkElementAutomationPeer
    {
        /// 
        public GroupItemAutomationPeer(GroupItem owner): base(owner)
        { 
        } 

        /// 
        override protected string GetClassNameCore()
        {
            return "GroupItem";
        } 

        /// 
        override protected AutomationControlType GetAutomationControlTypeCore() 
        {
            return AutomationControlType.Group; 
        }


 
        ///
        protected override List GetChildrenCore() 
        { 
            GroupItem owner = (GroupItem)Owner;
            ItemsControl itemsControl = ItemsControl.ItemsControlFromItemContainer(Owner); 
            ItemsControlAutomationPeer itemsControlAP = itemsControl.CreateAutomationPeer() as ItemsControlAutomationPeer;

            ItemContainerGenerator generator = owner.Generator;
            if (generator != null) 
            {
                IList items = generator.Items; 
                List children = new List(items.Count); 
                ItemPeersStorage oldChildren = _dataChildren; //cache the old ones for possible reuse
                _dataChildren = new ItemPeersStorage(); 
                if (items.Count > 0)
                {
                    foreach (object item in items)
                    { 
                        CollectionViewGroup cvg = item as CollectionViewGroup;
                        if (cvg != null) 
                        { 
                            GroupItem groupItem = generator.ContainerFromItem(item) as GroupItem;
                            if (groupItem != null) 
                            {
                                GroupItemAutomationPeer peer = groupItem.CreateAutomationPeer() as GroupItemAutomationPeer;
                                if (peer != null)
                                    children.Add(peer); 
                            }
                        } 
                        else 
                        {
                            //try to reuse old peer if it exists 
                            ItemAutomationPeer peer = oldChildren[item];
                            //no old peer - create new one
                            if (peer == null)
                                peer = itemsControlAP.CreateItemAutomationPeerInternal(item); 

                            //perform hookup so the events sourced from wrapper peer are fired as if from the data item 
                            if (peer != null) 
                            {
                                AutomationPeer wrapperPeer = peer.GetWrapperPeer(); 
                                if (wrapperPeer != null)
                                    wrapperPeer.EventsSource = peer;
                            }
 
                            //protection from indistinguishable items - for example, 2 strings with same value
                            //this scenario does not work in ItemsControl however is not checked for. 
                            if (_dataChildren[item] == null) 
                            {
                                children.Add(peer); 
                                _dataChildren[item] = peer;

                                // Update ItemsControl cache too
                                // ItemPeers needs to be updated because used in Selector and other ItemsControl subclasses to access item peers directly 
                                if (itemsControlAP.ItemPeers[item] == null)
                                { 
                                    itemsControlAP.ItemPeers[item] = peer; 
                                }
                            } 
                        }
                    }

                    return children; 
                }
            } 
 
            return null;
        } 

        private ItemPeersStorage _dataChildren = new ItemPeersStorage();

    } 
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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