GroupItemAutomationPeer.cs source code in C# .NET

                        Code:
                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / 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); 
            if (itemsControl != null)
            {
                ItemsControlAutomationPeer itemsControlAP = itemsControl.CreateAutomationPeer() as ItemsControlAutomationPeer;
                if (itemsControlAP != null) 
                {
                    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.
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); 
            if (itemsControl != null)
            {
                ItemsControlAutomationPeer itemsControlAP = itemsControl.CreateAutomationPeer() as ItemsControlAutomationPeer;
                if (itemsControlAP != null) 
                {
                    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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GroupItemAutomationPeer.cs source code in C# .NET

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