Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / PrePostDescendentsWalker.cs / 1305600 / PrePostDescendentsWalker.cs
//------------------------------------------------------------------------------ // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // A simple subclass of DescendentsWalker which introduces a second callback // which is called after a node's children have been visited. // // History: // 04/13/2004: rruiz: Introduces class. // 10/20/2004: rruiz: Moved class to MS.Internal. // //----------------------------------------------------------------------------- using System; using System.Diagnostics; using System.Windows; using MS.Utility; namespace MS.Internal { ////// A simple subclass of DescendentsWalker which introduces a second callback /// which is called after a node's children have been visited. /// internal class PrePostDescendentsWalker: DescendentsWalker { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors /// /// Creates an instances of PrePostDescendentsWalker. /// /// specifies which tree should be visited first /// the callback to be called before a node's children are visited /// the callback to be called after a node's children are visited /// the data passed to each callback public PrePostDescendentsWalker(TreeWalkPriority priority, VisitedCallbackpreCallback, VisitedCallback postCallback, T data) : base(priority, preCallback, data) { _postCallback = postCallback; } #endregion Constructors //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- #region Public Methods /// /// Starts the walking process for the given node. /// /// the node to start the walk on /// whether or not the first node should have the callbacks called on it public override void StartWalk(DependencyObject startNode, bool skipStartNode) { try { base.StartWalk(startNode, skipStartNode); } finally { if (!skipStartNode) { if (_postCallback != null) { // This type checking is done in DescendentsWalker. Doing it here // keeps us consistent. if (FrameworkElement.DType.IsInstanceOfType(startNode) || FrameworkContentElement.DType.IsInstanceOfType(startNode)) { _postCallback(startNode, this.Data); } } } } } #endregion Public Methods //------------------------------------------------------ // // Protected Methods // //------------------------------------------------------ #region Protected Methods ////// This method is called for every node touched during a walking of /// the tree. Some nodes may not have this called if the preCallback /// returns false - thereby preventing its subtree from being visited. /// /// the node to visit protected override void _VisitNode(DependencyObject d) { try { base._VisitNode(d); } finally { if (_postCallback != null) { _postCallback(d, this.Data); } } } #endregion Protected Methods //----------------------------------------------------- // // Private Properties // //------------------------------------------------------ #region Private Properties private VisitedCallback_postCallback; #endregion Private Properties } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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