TreeWalker.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / AccessibleTech / longhorn / Automation / UIAutomationClient / System / Windows / Automation / TreeWalker.cs / 1 / TreeWalker.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: TreeWalker class, allows client to walk custom views of 
//              UIAutomation tree.
// 
// History:
//  02/05/2004 : [....] Created
//
//--------------------------------------------------------------------------- 

using System; 
using System.Windows.Automation.Provider; 
using MS.Internal.Automation;
 
namespace System.Windows.Automation
{
    /// 
    /// TreeWalker - used to walk over a view of the UIAutomation tree 
    /// 
#if (INTERNAL_COMPILE) 
    internal sealed class TreeWalker 
#else
    public sealed class TreeWalker 
#endif
    {
        //-----------------------------------------------------
        // 
        //  Constructors
        // 
        //----------------------------------------------------- 

        #region Constructors 

        /// 
        /// Create a tree walker that can be used to walk a specified
        /// view of the UIAutomation tree. 
        /// 
        /// Condition defining the view - nodes that do not satisfy this condition are skipped over 
        public TreeWalker(Condition condition) 
        {
            Misc.ValidateArgumentNonNull(condition, "condition"); 
            _condition = condition;
        }

        #endregion Constructors 

 
        //------------------------------------------------------ 
        //
        //  Public Constants / Readonly Fields 
        //
        //-----------------------------------------------------

        #region Public Constants and Readonly Fields 

        ///  
        /// Predefined TreeWalker for walking the Raw view of the UIAutomation tree 
        /// 
        public static readonly TreeWalker RawViewWalker = new TreeWalker(Automation.RawViewCondition); 

        /// 
        /// Predefined TreeWalker for walking the Control view of the UIAutomation tree
        ///  
        public static readonly TreeWalker ControlViewWalker = new TreeWalker(Automation.ControlViewCondition);
 
        ///  
        /// Predefined TreeWalker for walking the Content view of the UIAutomation tree
        ///  
        public static readonly TreeWalker ContentViewWalker = new TreeWalker(Automation.ContentViewCondition);

        #endregion Public Constants and Readonly Fields
 

        //------------------------------------------------------ 
        // 
        //  Public Methods
        // 
        //------------------------------------------------------

        #region Public Methods
 
        /// 
        /// Get the parent of the specified element, in the current view 
        ///  
        /// element to get the parent of
        /// The parent of the specified element; can be null if 
        /// specified element was the root element
        /// The view used is determined by the condition passed to
        /// the constructor - elements that do not satisfy that condition
        /// are skipped over 
        public AutomationElement GetParent(AutomationElement element)
        { 
            Misc.ValidateArgumentNonNull(element, "element"); 
            return element.Navigate(NavigateDirection.Parent, _condition, null);
        } 

        /// 
        /// Get the first child of the specified element, in the current view
        ///  
        /// element to get the first child of
        /// The frst child of the specified element - or null if 
        /// the specified element has no children 
        /// The view used is determined by the condition passed to
        /// the constructor - elements that do not satisfy that condition 
        /// are skipped over
        public AutomationElement GetFirstChild(AutomationElement element)
        {
            Misc.ValidateArgumentNonNull(element, "element"); 
            return element.Navigate(NavigateDirection.FirstChild, _condition, null);
        } 
 
        /// 
        /// Get the last child of the specified element, in the current view 
        /// 
        /// element to get the last child of
        /// The last child of the specified element - or null if
        /// the specified element has no children 
        /// The view used is determined by the condition passed to
        /// the constructor - elements that do not satisfy that condition 
        /// are skipped over 
        public AutomationElement GetLastChild(AutomationElement element)
        { 
            Misc.ValidateArgumentNonNull(element, "element");
            return element.Navigate(NavigateDirection.LastChild, _condition, null);
        }
 
        /// 
        /// Get the next sibling of the specified element, in the current view 
        ///  
        /// element to get the next sibling of
        /// The next sibling of the specified element - or null if the 
        /// specified element has no next sibling
        /// The view used is determined by the condition passed to
        /// the constructor - elements that do not satisfy that condition
        /// are skipped over 
        public AutomationElement GetNextSibling(AutomationElement element)
        { 
            Misc.ValidateArgumentNonNull(element, "element"); 
            return element.Navigate(NavigateDirection.NextSibling, _condition, null);
        } 

        /// 
        /// Get the previous sibling of the specified element, in the current view
        ///  
        /// element to get the previous sibling of
        /// The previous sibling of the specified element - or null if the 
        /// specified element has no previous sibling 
        /// The view used is determined by the condition passed to
        /// the constructor - elements that do not satisfy that condition 
        /// are skipped over
        public AutomationElement GetPreviousSibling(AutomationElement element)
        {
            Misc.ValidateArgumentNonNull(element, "element"); 
            return element.Navigate(NavigateDirection.PreviousSibling, _condition, null);
        } 
 
        /// 
        /// Return the element or the nearest ancestor which is present in 
        /// the view of the tree used by this treewalker
        /// 
        /// element to normalize
        /// The element or the nearest ancestor which satisfies the 
        /// condition used by this TreeWalker
        ///  
        /// This method starts at the specified element and walks up the 
        /// tree until it finds an element that satisfies the TreeWalker's
        /// condition. 
        ///
        /// If the passed-in element itself satsifies the condition, it is
        /// returned as-is.
        /// 
        /// If the process of walking up the tree hits the root node, then
        /// the root node is returned, regardless of whether it satisfies 
        /// the condition or not. 
        /// 
        public AutomationElement Normalize(AutomationElement element) 
        {
            Misc.ValidateArgumentNonNull(element, "element");
            return element.Normalize(_condition, null);
        } 

 
        ///  
        /// Get the parent of the specified element, in the current view,
        /// prefetching properties 
        /// 
        /// element to get the parent of
        /// CacheRequest specifying information to be prefetched
        /// The parent of the specified element; can be null if 
        /// specified element was the root element
        /// The view used is determined by the condition passed to 
        /// the constructor - elements that do not satisfy that condition 
        /// are skipped over
        public AutomationElement GetParent(AutomationElement element, CacheRequest request) 
        {
            Misc.ValidateArgumentNonNull(element, "element");
            Misc.ValidateArgumentNonNull(request, "request");
            return element.Navigate(NavigateDirection.Parent, _condition, request); 
        }
 
        ///  
        /// Get the first child of the specified element, in the current view,
        /// prefetching properties 
        /// 
        /// element to get the first child of
        /// CacheRequest specifying information to be prefetched
        /// The frst child of the specified element - or null if 
        /// the specified element has no children
        /// The view used is determined by the condition passed to 
        /// the constructor - elements that do not satisfy that condition 
        /// are skipped over
        public AutomationElement GetFirstChild(AutomationElement element, CacheRequest request) 
        {
            Misc.ValidateArgumentNonNull(element, "element");
            Misc.ValidateArgumentNonNull(request, "request");
            return element.Navigate(NavigateDirection.FirstChild, _condition, request); 
        }
 
        ///  
        /// Get the last child of the specified element, in the current view,
        /// prefetching properties 
        /// 
        /// element to get the last child of
        /// CacheRequest specifying information to be prefetched
        /// The last child of the specified element - or null if 
        /// the specified element has no children
        /// The view used is determined by the condition passed to 
        /// the constructor - elements that do not satisfy that condition 
        /// are skipped over
        public AutomationElement GetLastChild(AutomationElement element, CacheRequest request) 
        {
            Misc.ValidateArgumentNonNull(element, "element");
            Misc.ValidateArgumentNonNull(request, "request");
            return element.Navigate(NavigateDirection.LastChild, _condition, request); 
        }
 
        ///  
        /// Get the next sibling of the specified element, in the current view,
        /// prefetching properties 
        /// 
        /// element to get the next sibling of
        /// CacheRequest specifying information to be prefetched
        /// The next sibling of the specified element - or null if the 
        /// specified element has no next sibling
        /// The view used is determined by the condition passed to 
        /// the constructor - elements that do not satisfy that condition 
        /// are skipped over
        public AutomationElement GetNextSibling(AutomationElement element, CacheRequest request) 
        {
            Misc.ValidateArgumentNonNull(element, "element");
            Misc.ValidateArgumentNonNull(request, "request");
            return element.Navigate(NavigateDirection.NextSibling, _condition, request); 
        }
 
        ///  
        /// Get the previous sibling of the specified element, in the current view,
        /// prefetching properties 
        /// 
        /// element to get the previous sibling of
        /// CacheRequest specifying information to be prefetched
        /// The previous sibling of the specified element - or null if the 
        /// specified element has no previous sibling
        /// The view used is determined by the condition passed to 
        /// the constructor - elements that do not satisfy that condition 
        /// are skipped over
        public AutomationElement GetPreviousSibling(AutomationElement element, CacheRequest request) 
        {
            Misc.ValidateArgumentNonNull(element, "element");
            Misc.ValidateArgumentNonNull(request, "request");
            return element.Navigate(NavigateDirection.PreviousSibling, _condition, request); 
        }
 
        ///  
        /// Return the element or the nearest ancestor which is present in
        /// the view of the tree used by this treewalker, prefetching properties 
        /// for the returned node
        /// 
        /// element to normalize
        /// CacheRequest specifying information to be prefetched 
        /// The element or the nearest ancestor which satisfies the
        /// condition used by this TreeWalker 
        ///  
        /// This method starts at the specified element and walks up the
        /// tree until it finds an element that satisfies the TreeWalker's 
        /// condition.
        ///
        /// If the passed-in element itself satsifies the condition, it is
        /// returned as-is. 
        ///
        /// If the process of walking up the tree hits the root node, then 
        /// the root node is returned, regardless of whether it satisfies 
        /// the condition or not.
        ///  
        public AutomationElement Normalize(AutomationElement element, CacheRequest request)
        {
            Misc.ValidateArgumentNonNull(element, "element");
            Misc.ValidateArgumentNonNull(request, "request"); 
            return element.Normalize(_condition, request);
        } 
 
        #endregion Public Methods
 

        //-----------------------------------------------------
        //
        //  Public Properties 
        //
        //------------------------------------------------------ 
 
        #region Public Properties
 
        /// 
        /// Returns the condition used by this TreeWalker. The TreeWalker
        /// skips over nodes that do not satisfy the condition.
        ///  
        public Condition Condition
        { 
            get 
            {
                return _condition; 
            }
        }

        #endregion Public Properties 

 
        //----------------------------------------------------- 
        //
        //  Private Fields 
        //
        //-----------------------------------------------------

        #region Private Fields 

        private Condition _condition; 
 
        #endregion Private Fields
    } 
}

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