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
- SafeProcessHandle.cs
- CqlIdentifiers.cs
- CheckedPointers.cs
- DataBinder.cs
- RuntimeConfigurationRecord.cs
- LayoutInformation.cs
- IsolatedStorageException.cs
- StylusButtonCollection.cs
- WebHttpBinding.cs
- NumberSubstitution.cs
- _NestedMultipleAsyncResult.cs
- WindowsStatic.cs
- Configuration.cs
- IPEndPointCollection.cs
- ToolBarPanel.cs
- AttachedPropertyInfo.cs
- DataGridViewRowConverter.cs
- NavigationProperty.cs
- ViewStateException.cs
- TransformGroup.cs
- StringExpressionSet.cs
- AutomationElement.cs
- LicenseContext.cs
- ScriptComponentDescriptor.cs
- MissingFieldException.cs
- ListViewItemSelectionChangedEvent.cs
- QilSortKey.cs
- GroupLabel.cs
- TextParagraph.cs
- TraceHwndHost.cs
- ConfigurationHelpers.cs
- DesignerTextViewAdapter.cs
- SerializationEventsCache.cs
- AssemblyBuilder.cs
- FontDriver.cs
- DataGridViewLinkCell.cs
- Inflater.cs
- Calendar.cs
- RNGCryptoServiceProvider.cs
- SubMenuStyle.cs
- RawStylusInputCustomDataList.cs
- SubqueryRules.cs
- ItemCollection.cs
- TableColumn.cs
- ChameleonKey.cs
- RecordsAffectedEventArgs.cs
- NetDataContractSerializer.cs
- FactoryGenerator.cs
- EntityTransaction.cs
- XmlRawWriterWrapper.cs
- CallContext.cs
- FixedSOMContainer.cs
- MetadataArtifactLoaderFile.cs
- StaticDataManager.cs
- WebPartConnectionsConfigureVerb.cs
- rsa.cs
- ReadOnlyHierarchicalDataSourceView.cs
- CodeNamespaceImportCollection.cs
- PerfCounterSection.cs
- SqlCrossApplyToCrossJoin.cs
- MetadataPropertyvalue.cs
- RangeValidator.cs
- ObjectConverter.cs
- XLinq.cs
- SqlWebEventProvider.cs
- WebPartZoneBase.cs
- RestHandler.cs
- DataGridViewCellValueEventArgs.cs
- SmiMetaDataProperty.cs
- ElapsedEventArgs.cs
- GraphicsPath.cs
- RSAPKCS1KeyExchangeFormatter.cs
- objectquery_tresulttype.cs
- Floater.cs
- DataRowChangeEvent.cs
- ItemCollection.cs
- XamlRtfConverter.cs
- PointLightBase.cs
- FormViewPageEventArgs.cs
- RadioButtonAutomationPeer.cs
- NetworkInterface.cs
- QilXmlWriter.cs
- DetailsViewInsertEventArgs.cs
- EditorZoneBase.cs
- _Semaphore.cs
- FocusWithinProperty.cs
- DBBindings.cs
- EventDescriptor.cs
- TraceData.cs
- DesignerDataView.cs
- Hashtable.cs
- ObjectHandle.cs
- MulticastOption.cs
- WebConfigManager.cs
- ASCIIEncoding.cs
- UtilityExtension.cs
- TaskFileService.cs
- __Filters.cs
- PrivateUnsafeNativeCompoundFileMethods.cs
- ProvidersHelper.cs