Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Framework / MS / Internal / PrePostDescendentsWalker.cs / 1 / 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. //------------------------------------------------------------------------------ // // // 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
- DoubleAnimationUsingPath.cs
- ComponentRenameEvent.cs
- InputLanguageManager.cs
- InternalDispatchObject.cs
- UITypeEditor.cs
- DiscoveryService.cs
- XPathItem.cs
- tooltip.cs
- GenericUI.cs
- ListDictionaryInternal.cs
- DataControlCommands.cs
- Page.cs
- ScalarConstant.cs
- ArgumentOutOfRangeException.cs
- Screen.cs
- DocumentAutomationPeer.cs
- ConnectionStringsSection.cs
- IntPtr.cs
- EncryptedXml.cs
- BitmapEffectDrawingContextWalker.cs
- UrlMappingsSection.cs
- NameValueConfigurationCollection.cs
- DateTimeConverter2.cs
- SimpleBitVector32.cs
- ArrayWithOffset.cs
- SchemaMapping.cs
- ContextMenuService.cs
- PageThemeParser.cs
- TypeSystem.cs
- PageWrapper.cs
- ResourceSet.cs
- RoutedPropertyChangedEventArgs.cs
- Int64AnimationBase.cs
- C14NUtil.cs
- DataGridHelper.cs
- SharedPerformanceCounter.cs
- SimpleNameService.cs
- ZipIOLocalFileBlock.cs
- ListViewDeletedEventArgs.cs
- SafeArrayRankMismatchException.cs
- followingsibling.cs
- QilSortKey.cs
- ApplicationCommands.cs
- OdbcException.cs
- DataObject.cs
- ListCollectionView.cs
- LineBreakRecord.cs
- PrintDialog.cs
- DatatypeImplementation.cs
- AxImporter.cs
- XmlQueryTypeFactory.cs
- StyleSheetRefUrlEditor.cs
- ChineseLunisolarCalendar.cs
- DataKeyPropertyAttribute.cs
- XPathNavigatorReader.cs
- WebPartConnectionsCancelVerb.cs
- XPathDescendantIterator.cs
- DateTimeFormatInfo.cs
- SemanticBasicElement.cs
- ComponentDispatcher.cs
- MsmqIntegrationValidationBehavior.cs
- LOSFormatter.cs
- FloaterParagraph.cs
- Timeline.cs
- PropertyEntry.cs
- XmlSchemaComplexContent.cs
- WorkflowApplicationIdleEventArgs.cs
- IdentityHolder.cs
- TableItemPatternIdentifiers.cs
- FacetEnabledSchemaElement.cs
- DPAPIProtectedConfigurationProvider.cs
- TargetParameterCountException.cs
- HttpApplication.cs
- ToolStripSettings.cs
- HttpChannelBindingToken.cs
- ReverseInheritProperty.cs
- KoreanLunisolarCalendar.cs
- StringUtil.cs
- SrgsElement.cs
- WebPartEditVerb.cs
- ExportOptions.cs
- OleDbPropertySetGuid.cs
- HijriCalendar.cs
- StructuredTypeEmitter.cs
- DefaultBindingPropertyAttribute.cs
- NameValuePair.cs
- HuffCodec.cs
- StructuredProperty.cs
- SafeProcessHandle.cs
- GroupBoxAutomationPeer.cs
- DispatchWrapper.cs
- VerificationException.cs
- MethodBuilder.cs
- SoapIgnoreAttribute.cs
- AnimatedTypeHelpers.cs
- PageAsyncTask.cs
- DataGridViewColumnDesignTimeVisibleAttribute.cs
- TypeDelegator.cs
- DataGridViewElement.cs
- AspNetSynchronizationContext.cs