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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ImageBrush.cs
- ApplicationId.cs
- TextBreakpoint.cs
- Operators.cs
- EllipseGeometry.cs
- ClientCultureInfo.cs
- PathGeometry.cs
- ping.cs
- DesignerValidationSummaryAdapter.cs
- MultiPageTextView.cs
- DataPagerCommandEventArgs.cs
- XamlPoint3DCollectionSerializer.cs
- TimeZone.cs
- Environment.cs
- FormsAuthentication.cs
- Int32KeyFrameCollection.cs
- FixedSOMGroup.cs
- MatrixConverter.cs
- EllipseGeometry.cs
- PropertyMetadata.cs
- DecimalSumAggregationOperator.cs
- WinEventHandler.cs
- ColorBlend.cs
- InternalUserCancelledException.cs
- ListControlConvertEventArgs.cs
- OnOperation.cs
- SiblingIterators.cs
- XmlValidatingReaderImpl.cs
- CategoryNameCollection.cs
- SqlUdtInfo.cs
- X509DefaultServiceCertificateElement.cs
- SmtpSpecifiedPickupDirectoryElement.cs
- SystemTcpStatistics.cs
- EncodingDataItem.cs
- XNodeNavigator.cs
- WebPartTransformerCollection.cs
- TemplateColumn.cs
- FakeModelPropertyImpl.cs
- FileDataSourceCache.cs
- EventPropertyMap.cs
- _HeaderInfoTable.cs
- OwnerDrawPropertyBag.cs
- InstanceStoreQueryResult.cs
- SiteMapNodeItem.cs
- XmlTextEncoder.cs
- FixedStringLookup.cs
- BitmapEffectInput.cs
- SafeEventLogReadHandle.cs
- DefaultProxySection.cs
- HttpResponseInternalWrapper.cs
- Point3DAnimationBase.cs
- OleDbCommandBuilder.cs
- GAC.cs
- ContainerUIElement3D.cs
- SystemGatewayIPAddressInformation.cs
- QilReplaceVisitor.cs
- FormViewUpdateEventArgs.cs
- XmlCountingReader.cs
- ISAPIRuntime.cs
- GenericIdentity.cs
- XmlHelper.cs
- RegistryKey.cs
- TableRow.cs
- VirtualPathProvider.cs
- PackageRelationship.cs
- WebBrowserNavigatingEventHandler.cs
- WorkflowDataContext.cs
- AuthenticationModulesSection.cs
- NetStream.cs
- TableLayoutStyle.cs
- _FtpDataStream.cs
- RouteParameter.cs
- columnmapfactory.cs
- KeyValuePairs.cs
- PropertyMappingExceptionEventArgs.cs
- SmiTypedGetterSetter.cs
- MenuItem.cs
- TypeUnloadedException.cs
- BooleanToVisibilityConverter.cs
- TextContainerChangedEventArgs.cs
- LabelEditEvent.cs
- X509UI.cs
- PageAdapter.cs
- TagElement.cs
- ComboBox.cs
- DateTimeFormatInfoScanner.cs
- CardSpaceException.cs
- FontFamily.cs
- DbMetaDataColumnNames.cs
- PathSegment.cs
- NameGenerator.cs
- PeerServiceMessageContracts.cs
- VisualBasicReference.cs
- UInt64.cs
- FreezableDefaultValueFactory.cs
- BitmapEffectDrawingContextState.cs
- MarkerProperties.cs
- CodeCompiler.cs
- GeneralTransformGroup.cs
- Label.cs