TreeViewAutomationPeer.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Automation / Peers / TreeViewAutomationPeer.cs / 1305600 / TreeViewAutomationPeer.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.Interop;
using System.Windows.Media;

using MS.Internal; 
using MS.Win32;
 
namespace System.Windows.Automation.Peers 
{
 
    ///
    public class TreeViewAutomationPeer : ItemsControlAutomationPeer, ISelectionProvider
    {
        /// 
        public TreeViewAutomationPeer(TreeView owner): base(owner)
        {} 
 
        ///
        override protected AutomationControlType GetAutomationControlTypeCore() 
        {
            return AutomationControlType.Tree;
        }
 
        ///
        override protected string GetClassNameCore() 
        { 
            return "TreeView";
        } 

        ///
        override public object GetPattern(PatternInterface patternInterface)
        { 
            if (patternInterface == PatternInterface.Selection)
            { 
                return this; 
            }
            else if(patternInterface == PatternInterface.Scroll) 
            {
                ItemsControl owner = (ItemsControl)Owner;
                if(owner.ScrollHost != null)
                { 
                    AutomationPeer scrollPeer = UIElementAutomationPeer.CreatePeerForElement(owner.ScrollHost);
                    if(scrollPeer != null && scrollPeer is IScrollProvider) 
                    { 
                        scrollPeer.EventsSource = this;
                        return (IScrollProvider)scrollPeer; 
                    }
                }
            }
 
            return base.GetPattern(patternInterface);
        } 
 
        ///
        protected override List GetChildrenCore() 
        {
            // To avoid the situation on legacy systems which may not have new unmanaged core. with this change with old unmanaged core
            // the behavior would be same as earlier.
            if (ItemContainerPatternIdentifiers.Pattern != null) 
                return base.GetChildrenCore();
            else 
            { 
                ItemsControl owner = (ItemsControl)Owner;
                ItemCollection items = owner.Items; 
                List children = null;
                ItemPeersStorage oldChildren = ItemPeers; //cache the old ones for possible reuse
                ItemPeers = new ItemPeersStorage();
 
                if (items.Count > 0)
                { 
                    children = new List(items.Count); 
                    for (int i = 0; i < items.Count; i++)
                    { 
                        TreeViewItem treeViewItem = owner.ItemContainerGenerator.ContainerFromIndex(i) as TreeViewItem;
                        if (treeViewItem != null)
                        {
                            ItemAutomationPeer peer = oldChildren[items[i]]; 
                            if (peer == null)
                                peer = CreateItemAutomationPeer(items[i]); 
 
                            // 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;
                                } 
                            } 

                            // Not to add same Item again 
                            if (ItemPeers[items[i]] == null)
                            {
                                children.Add(peer);
                               ItemPeers[items[i]] = peer; 
                            }
                        } 
                    } 
                    return children;
                } 
            }
            return null;
        }
 
        ///
        override protected ItemAutomationPeer CreateItemAutomationPeer(object item) 
        { 
            return new TreeViewDataItemAutomationPeer(item, this, null);
        } 

        ///
        internal override bool IsPropertySupportedByControlForFindItem(int id)
        { 
            if (base.IsPropertySupportedByControlForFindItem(id))
                return true; 
            else 
            {
                if (SelectionItemPatternIdentifiers.IsSelectedProperty.Id == id) 
                    return true;
                else
                    return false;
            } 
        }
 
        ///  
        /// Support for IsSelectedProperty should come from SelectorAutomationPeer only,
        ///  
        internal override object GetSupportedPropertyValue(ItemAutomationPeer itemPeer, int propertyId)
        {
            if (SelectionItemPatternIdentifiers.IsSelectedProperty.Id == propertyId)
            { 
                ISelectionItemProvider selectionItem = itemPeer.GetPattern(PatternInterface.SelectionItem) as ISelectionItemProvider;
                if (selectionItem != null) 
                    return selectionItem.IsSelected; 
                else
                    return null; 
            }
            return base.GetSupportedPropertyValue(itemPeer, propertyId);
        }
 
        //--------------------------------------------------------------------
        // 
        //  ISelectionProvider 
        //
        //------------------------------------------------------------------- 

        #region ISelectionProvider

        ///  
        ///     Returns the current selection.
        ///  
        /// The current selection. 
        IRawElementProviderSimple[] ISelectionProvider.GetSelection()
        { 
            IRawElementProviderSimple[] selection = null;
            TreeViewItem selectedContainer = ((TreeView)Owner).SelectedContainer;
            if (selectedContainer != null)
            { 
                AutomationPeer peer = UIElementAutomationPeer.FromElement(selectedContainer);
 
                // With virtualization in effect TreeViewDataItemAP would be exposed to client not the Peer directly associated with UI 
                // and Selection must return the relevant peer(TreeViewDataItemAP) stored in EventSource.
                if(peer.EventsSource != null) 
                    peer = peer.EventsSource;

                if (peer != null)
                { 
                    selection = new IRawElementProviderSimple[] { ProviderFromPeer(peer) };
                } 
            } 

            if (selection == null) 
            {
                selection = new IRawElementProviderSimple[0];
            }
 
            return selection;
        } 
 
        bool ISelectionProvider.CanSelectMultiple
        { 
            get
            {
                return false;
            } 
        }
 
        bool ISelectionProvider.IsSelectionRequired 
        {
            get 
            {
                return false;
            }
        } 

        #endregion 
    } 
}
 



// 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.Interop;
using System.Windows.Media;

using MS.Internal; 
using MS.Win32;
 
namespace System.Windows.Automation.Peers 
{
 
    ///
    public class TreeViewAutomationPeer : ItemsControlAutomationPeer, ISelectionProvider
    {
        /// 
        public TreeViewAutomationPeer(TreeView owner): base(owner)
        {} 
 
        ///
        override protected AutomationControlType GetAutomationControlTypeCore() 
        {
            return AutomationControlType.Tree;
        }
 
        ///
        override protected string GetClassNameCore() 
        { 
            return "TreeView";
        } 

        ///
        override public object GetPattern(PatternInterface patternInterface)
        { 
            if (patternInterface == PatternInterface.Selection)
            { 
                return this; 
            }
            else if(patternInterface == PatternInterface.Scroll) 
            {
                ItemsControl owner = (ItemsControl)Owner;
                if(owner.ScrollHost != null)
                { 
                    AutomationPeer scrollPeer = UIElementAutomationPeer.CreatePeerForElement(owner.ScrollHost);
                    if(scrollPeer != null && scrollPeer is IScrollProvider) 
                    { 
                        scrollPeer.EventsSource = this;
                        return (IScrollProvider)scrollPeer; 
                    }
                }
            }
 
            return base.GetPattern(patternInterface);
        } 
 
        ///
        protected override List GetChildrenCore() 
        {
            // To avoid the situation on legacy systems which may not have new unmanaged core. with this change with old unmanaged core
            // the behavior would be same as earlier.
            if (ItemContainerPatternIdentifiers.Pattern != null) 
                return base.GetChildrenCore();
            else 
            { 
                ItemsControl owner = (ItemsControl)Owner;
                ItemCollection items = owner.Items; 
                List children = null;
                ItemPeersStorage oldChildren = ItemPeers; //cache the old ones for possible reuse
                ItemPeers = new ItemPeersStorage();
 
                if (items.Count > 0)
                { 
                    children = new List(items.Count); 
                    for (int i = 0; i < items.Count; i++)
                    { 
                        TreeViewItem treeViewItem = owner.ItemContainerGenerator.ContainerFromIndex(i) as TreeViewItem;
                        if (treeViewItem != null)
                        {
                            ItemAutomationPeer peer = oldChildren[items[i]]; 
                            if (peer == null)
                                peer = CreateItemAutomationPeer(items[i]); 
 
                            // 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;
                                } 
                            } 

                            // Not to add same Item again 
                            if (ItemPeers[items[i]] == null)
                            {
                                children.Add(peer);
                               ItemPeers[items[i]] = peer; 
                            }
                        } 
                    } 
                    return children;
                } 
            }
            return null;
        }
 
        ///
        override protected ItemAutomationPeer CreateItemAutomationPeer(object item) 
        { 
            return new TreeViewDataItemAutomationPeer(item, this, null);
        } 

        ///
        internal override bool IsPropertySupportedByControlForFindItem(int id)
        { 
            if (base.IsPropertySupportedByControlForFindItem(id))
                return true; 
            else 
            {
                if (SelectionItemPatternIdentifiers.IsSelectedProperty.Id == id) 
                    return true;
                else
                    return false;
            } 
        }
 
        ///  
        /// Support for IsSelectedProperty should come from SelectorAutomationPeer only,
        ///  
        internal override object GetSupportedPropertyValue(ItemAutomationPeer itemPeer, int propertyId)
        {
            if (SelectionItemPatternIdentifiers.IsSelectedProperty.Id == propertyId)
            { 
                ISelectionItemProvider selectionItem = itemPeer.GetPattern(PatternInterface.SelectionItem) as ISelectionItemProvider;
                if (selectionItem != null) 
                    return selectionItem.IsSelected; 
                else
                    return null; 
            }
            return base.GetSupportedPropertyValue(itemPeer, propertyId);
        }
 
        //--------------------------------------------------------------------
        // 
        //  ISelectionProvider 
        //
        //------------------------------------------------------------------- 

        #region ISelectionProvider

        ///  
        ///     Returns the current selection.
        ///  
        /// The current selection. 
        IRawElementProviderSimple[] ISelectionProvider.GetSelection()
        { 
            IRawElementProviderSimple[] selection = null;
            TreeViewItem selectedContainer = ((TreeView)Owner).SelectedContainer;
            if (selectedContainer != null)
            { 
                AutomationPeer peer = UIElementAutomationPeer.FromElement(selectedContainer);
 
                // With virtualization in effect TreeViewDataItemAP would be exposed to client not the Peer directly associated with UI 
                // and Selection must return the relevant peer(TreeViewDataItemAP) stored in EventSource.
                if(peer.EventsSource != null) 
                    peer = peer.EventsSource;

                if (peer != null)
                { 
                    selection = new IRawElementProviderSimple[] { ProviderFromPeer(peer) };
                } 
            } 

            if (selection == null) 
            {
                selection = new IRawElementProviderSimple[0];
            }
 
            return selection;
        } 
 
        bool ISelectionProvider.CanSelectMultiple
        { 
            get
            {
                return false;
            } 
        }
 
        bool ISelectionProvider.IsSelectionRequired 
        {
            get 
            {
                return false;
            }
        } 

        #endregion 
    } 
}
 



// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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TreeViewAutomationPeer.cs source code in C# .NET

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