TreeViewItemAutomationPeer.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Automation / Peers / TreeViewItemAutomationPeer.cs / 1 / TreeViewItemAutomationPeer.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 TreeViewItemAutomationPeer : FrameworkElementAutomationPeer, IExpandCollapseProvider, ISelectionItemProvider, IScrollItemProvider
    {
        ///
        public TreeViewItemAutomationPeer(TreeViewItem owner): base(owner) 
        {
        } 
 
        ///
        override protected string GetClassNameCore() 
        {
            return "TreeViewItem";
        }
 
        ///
        override protected AutomationControlType GetAutomationControlTypeCore() 
        { 
            return AutomationControlType.TreeItem;
        } 


        ///
        override public object GetPattern(PatternInterface patternInterface) 
        {
            if (patternInterface == PatternInterface.ExpandCollapse) 
            { 
                return this;
            } 
            else if (patternInterface == PatternInterface.SelectionItem)
            {
                return this;
            } 
            else if (patternInterface == PatternInterface.ScrollItem)
            { 
                return this; 
            }
 
            return null;
        }

        /// 
        void IExpandCollapseProvider.Expand()
        { 
            if(!IsEnabled()) 
                throw new ElementNotEnabledException();
 
            TreeViewItem treeViewItem = (TreeViewItem)Owner;

            if (!treeViewItem.HasItems)
            { 
                throw new InvalidOperationException(SR.Get(SRID.UIA_OperationCannotBePerformed));
            } 
 
            treeViewItem.IsExpanded = true;
        } 

        ///
        void IExpandCollapseProvider.Collapse()
        { 
            if(!IsEnabled())
                throw new ElementNotEnabledException(); 
 
            TreeViewItem treeViewItem = (TreeViewItem)Owner;
 
            if (!treeViewItem.HasItems)
            {
                throw new InvalidOperationException(SR.Get(SRID.UIA_OperationCannotBePerformed));
            } 

            treeViewItem.IsExpanded = false; 
        } 

        ExpandCollapseState IExpandCollapseProvider.ExpandCollapseState 
        {
            get
            {
                TreeViewItem treeViewItem = (TreeViewItem)Owner; 
                if (treeViewItem.HasItems)
                    return treeViewItem.IsExpanded ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed; 
                else 
                    return ExpandCollapseState.LeafNode;
            } 
        }

        //
        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)] 
        internal void RaiseExpandCollapseAutomationEvent(bool oldValue, bool newValue)
        { 
            RaisePropertyChangedEvent( 
                ExpandCollapsePatternIdentifiers.ExpandCollapseStateProperty,
                oldValue ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed, 
                newValue ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed);
        }

        #region ISelectionItemProvider 

        ///  
        ///     Selects this element, removing any other element from the selection. 
        /// 
        void ISelectionItemProvider.Select() 
        {
            ((TreeViewItem)Owner).IsSelected = true;
        }
 
        /// 
        ///     Selects this item. 
        ///  
        void ISelectionItemProvider.AddToSelection()
        { 
            TreeView treeView = ((TreeViewItem)Owner).ParentTreeView;
            // If TreeView already has a selected item different from current - we cannot add to selection and throw
            if (treeView == null || (treeView.SelectedItem != null && treeView.SelectedContainer != Owner))
            { 
                throw new InvalidOperationException(SR.Get(SRID.UIA_OperationCannotBePerformed));
            } 
            ((TreeViewItem)Owner).IsSelected = true; 
        }
 
        /// 
        ///     Unselects this item.
        /// 
        void ISelectionItemProvider.RemoveFromSelection() 
        {
            ((TreeViewItem)Owner).IsSelected = false; 
        } 

        ///  
        ///     Returns whether the item is selected.
        /// 
        bool ISelectionItemProvider.IsSelected
        { 
            get
            { 
                return ((TreeViewItem)Owner).IsSelected; 
            }
        } 

        /// 
        ///     The logical element that supports the SelectionPattern for this item.
        ///  
        IRawElementProviderSimple ISelectionItemProvider.SelectionContainer
        { 
            get 
            {
                ItemsControl parent = ((TreeViewItem)Owner).ParentItemsControl; 
                if (parent != null)
                {
                    AutomationPeer peer = UIElementAutomationPeer.FromElement(parent);
                    if (peer != null) 
                        return ProviderFromPeer(peer);
                } 
 
                return null;
            } 
        }

        void IScrollItemProvider.ScrollIntoView()
        { 
            ((TreeViewItem)Owner).BringIntoView();
        } 
 
        //
        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)] 
        internal void RaiseAutomationIsSelectedChanged(bool isSelected)
        {
            RaisePropertyChangedEvent(
                SelectionItemPatternIdentifiers.IsSelectedProperty, 
                !isSelected,
                isSelected); 
        } 

        #endregion 
    }
}


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

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