Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / TextTreeUndo.cs / 1 / TextTreeUndo.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Helper class for TextContainer, handles all undo operations. // // History: // 03/03/2004 : [....] - Created // //--------------------------------------------------------------------------- using MS.Internal.Documents; namespace System.Windows.Documents { // This static class is logically an extension of TextContainer. It contains // TextContainer undo related helpers. internal static class TextTreeUndo { //----------------------------------------------------- // // Internal Methods // //----------------------------------------------------- #region Internal Methods // Adds a TextTreeInsertUndoUnit to the open parent undo unit, if any. // Called from TextContainer.InsertText and TextContainer.InsertEmbeddedObject. internal static void CreateInsertUndoUnit(TextContainer tree, int symbolOffset, int symbolCount) { UndoManager undoManager; undoManager = GetOrClearUndoManager(tree); if (undoManager == null) return; undoManager.Add(new TextTreeInsertUndoUnit(tree, symbolOffset, symbolCount)); } // Adds a TextTreeInsertElementUndoUnit to the open parent undo unit, if any. // Called from TextContainer.InsertElement. internal static void CreateInsertElementUndoUnit(TextContainer tree, int symbolOffset, bool deep) { UndoManager undoManager; undoManager = GetOrClearUndoManager(tree); if (undoManager == null) return; undoManager.Add(new TextTreeInsertElementUndoUnit(tree, symbolOffset, deep)); } // Adds a TextTreePropertyUndoUnit to the open parent undo unit, if any. // Called by TextElement's property change listener. internal static void CreatePropertyUndoUnit(TextElement element, DependencyPropertyChangedEventArgs e) { UndoManager undoManager; PropertyRecord record; TextContainer textContainer = element.TextContainer; undoManager = GetOrClearUndoManager(textContainer); if (undoManager == null) return; record = new PropertyRecord(); record.Property = e.Property; record.Value = e.OldValueSource == BaseValueSourceInternal.Local ? e.OldValue : DependencyProperty.UnsetValue; undoManager.Add(new TextTreePropertyUndoUnit(textContainer, element.TextElementNode.GetSymbolOffset(textContainer.Generation) + 1, record)); } // Adds a DeleteContentUndoUnit to the open parent undo unit, if any. // Called by TextContainer.DeleteContent. internal static TextTreeDeleteContentUndoUnit CreateDeleteContentUndoUnit(TextContainer tree, TextPointer start, TextPointer end) { UndoManager undoManager; TextTreeDeleteContentUndoUnit undoUnit; if (start.CompareTo(end) == 0) return null; undoManager = GetOrClearUndoManager(tree); if (undoManager == null) return null; undoUnit = new TextTreeDeleteContentUndoUnit(tree, start, end); undoManager.Add(undoUnit); return undoUnit; } // Adds a TextTreeExtractElementUndoUnit to the open parent undo unit, if any. // Called by TextContainer.ExtractElement. internal static TextTreeExtractElementUndoUnit CreateExtractElementUndoUnit(TextContainer tree, TextTreeTextElementNode elementNode) { UndoManager undoManager; TextTreeExtractElementUndoUnit undoUnit; undoManager = GetOrClearUndoManager(tree); if (undoManager == null) return null; undoUnit = new TextTreeExtractElementUndoUnit(tree, elementNode); undoManager.Add(undoUnit); return undoUnit; } // Returns the local UndoManager. // Returns null if there is no undo service or if the service exists // but is disabled or if there is no open parent undo unit. internal static UndoManager GetOrClearUndoManager(ITextContainer textContainer) { UndoManager undoManager; undoManager = textContainer.UndoManager; if (undoManager == null) return null; if (!undoManager.IsEnabled) return null; if (undoManager.OpenedUnit == null) { // There's no parent undo unit, so we can't open a child. // // Clear the undo stack -- since we depend on symbol offsets // matching the original document state when an undo unit is // executed, any of our units currently in the stack will be // corrupted after we finished the operation in progress. undoManager.Clear(); return null; } return undoManager; } #endregion Internal methods } } // 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
- TheQuery.cs
- LineServicesCallbacks.cs
- PrintDocument.cs
- CustomAssemblyResolver.cs
- PathFigureCollectionValueSerializer.cs
- OdbcReferenceCollection.cs
- XmlSecureResolver.cs
- ParseHttpDate.cs
- WebPartEditVerb.cs
- MembershipAdapter.cs
- SignedXml.cs
- ProtectedConfigurationProviderCollection.cs
- Wildcard.cs
- PenContext.cs
- AppDomainAttributes.cs
- XmlSchemaAnyAttribute.cs
- DataControlFieldHeaderCell.cs
- ClientData.cs
- TextTreeText.cs
- InstanceContextManager.cs
- XmlDomTextWriter.cs
- TimeoutException.cs
- EntityDataSourceSelectedEventArgs.cs
- UseAttributeSetsAction.cs
- OLEDB_Enum.cs
- CompositeTypefaceMetrics.cs
- DesignTimeVisibleAttribute.cs
- ImageIndexEditor.cs
- ReplacementText.cs
- XmlFormatExtensionAttribute.cs
- BuilderInfo.cs
- MessageQueuePermission.cs
- DesignerActionListCollection.cs
- NativeMethodsOther.cs
- Transform3D.cs
- DefaultPrintController.cs
- _IPv4Address.cs
- TdsParserSessionPool.cs
- FailedToStartupUIException.cs
- DesignTimeTemplateParser.cs
- RepeaterItem.cs
- ImageDrawing.cs
- EmbossBitmapEffect.cs
- AliasedSlot.cs
- TypefaceCollection.cs
- assemblycache.cs
- XamlPathDataSerializer.cs
- Control.cs
- HttpCapabilitiesBase.cs
- controlskin.cs
- SqlBulkCopy.cs
- FileDialogCustomPlace.cs
- pingexception.cs
- WebPartConnectionsCloseVerb.cs
- ValidatedMobileControlConverter.cs
- Baml6Assembly.cs
- GetMemberBinder.cs
- HtmlContainerControl.cs
- ProviderIncompatibleException.cs
- RemoteCryptoDecryptRequest.cs
- EdmComplexPropertyAttribute.cs
- filewebresponse.cs
- FontConverter.cs
- AuthorizationSection.cs
- DelegatingChannelListener.cs
- PersonalizationAdministration.cs
- QuaternionValueSerializer.cs
- AudioDeviceOut.cs
- DataFormats.cs
- FamilyMapCollection.cs
- QueryCreatedEventArgs.cs
- ValidationHelper.cs
- EdmToObjectNamespaceMap.cs
- HybridObjectCache.cs
- MultipleViewPattern.cs
- HtmlInputText.cs
- Cursors.cs
- Pts.cs
- CatalogZoneBase.cs
- XmlTypeMapping.cs
- ListViewHitTestInfo.cs
- Relationship.cs
- UICuesEvent.cs
- LayoutDump.cs
- WebPartAuthorizationEventArgs.cs
- ProviderSettings.cs
- RealProxy.cs
- SecurityContextTokenValidationException.cs
- DetectRunnableInstancesTask.cs
- ClientBuildManager.cs
- ClientWindowsAuthenticationMembershipProvider.cs
- ProviderManager.cs
- EventRoute.cs
- WebPartExportVerb.cs
- DataControlCommands.cs
- DataMemberConverter.cs
- HtmlTextBoxAdapter.cs
- WebConfigurationManager.cs
- ParallelQuery.cs
- XPathAncestorIterator.cs