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
- FragmentQueryKB.cs
- CopyNamespacesAction.cs
- precedingquery.cs
- CodeGenerator.cs
- PropertyStore.cs
- Single.cs
- MultiSelectRootGridEntry.cs
- EraserBehavior.cs
- XmlSerializationWriter.cs
- Primitive.cs
- EncodingDataItem.cs
- HeaderedItemsControl.cs
- X509Extension.cs
- ServerValidateEventArgs.cs
- XPathException.cs
- filewebrequest.cs
- BufferedReadStream.cs
- DebugView.cs
- TemplateControlBuildProvider.cs
- isolationinterop.cs
- FormsAuthenticationUserCollection.cs
- SqlNotificationEventArgs.cs
- HtmlEmptyTagControlBuilder.cs
- EntityDataSourceContextCreatingEventArgs.cs
- InputBuffer.cs
- RadioButtonStandardAdapter.cs
- AttributeConverter.cs
- SelectingProviderEventArgs.cs
- PrivilegedConfigurationManager.cs
- OleServicesContext.cs
- TypeHelpers.cs
- ProxyWebPartConnectionCollection.cs
- HorizontalAlignConverter.cs
- DateTimeValueSerializer.cs
- DiagnosticTrace.cs
- XPathNavigator.cs
- ViewValidator.cs
- MarginsConverter.cs
- NetworkCredential.cs
- FastEncoderStatics.cs
- Literal.cs
- ContextStack.cs
- ObjectComplexPropertyMapping.cs
- PenLineCapValidation.cs
- StrongName.cs
- Vertex.cs
- TextServicesCompartmentEventSink.cs
- ChangeDirector.cs
- CompositionAdorner.cs
- ControlCodeDomSerializer.cs
- SiteMapProvider.cs
- VisualBasicSettingsHandler.cs
- ProtocolsSection.cs
- SchemaEntity.cs
- Int32AnimationBase.cs
- PinnedBufferMemoryStream.cs
- MenuItemCollection.cs
- AssemblySettingAttributes.cs
- WebPartConnectionsCancelVerb.cs
- TextureBrush.cs
- ColorConverter.cs
- HttpProfileGroupBase.cs
- Aggregates.cs
- Pkcs7Signer.cs
- ProvidersHelper.cs
- ImageKeyConverter.cs
- TextTreeTextElementNode.cs
- ToolStripItemCollection.cs
- ComponentEditorForm.cs
- PathParser.cs
- XmlSchemaInclude.cs
- PointCollection.cs
- DataGridViewCellErrorTextNeededEventArgs.cs
- UpdatePanelControlTrigger.cs
- EventItfInfo.cs
- ModelService.cs
- SerializableAuthorizationContext.cs
- SafeEventLogWriteHandle.cs
- TreeNodeEventArgs.cs
- HttpListenerPrefixCollection.cs
- TextShapeableCharacters.cs
- DependencyObjectType.cs
- ArrangedElement.cs
- ColumnCollection.cs
- XamlUtilities.cs
- ObjectListFieldCollection.cs
- NamedPipeDuplicateContext.cs
- BasicHttpBindingElement.cs
- XmlSchemaCollection.cs
- TextRunProperties.cs
- EventlogProvider.cs
- BindingsCollection.cs
- DataTrigger.cs
- ControlSerializer.cs
- MetadataSource.cs
- MaterialGroup.cs
- GeneratedCodeAttribute.cs
- XmlSerializerAssemblyAttribute.cs
- PermissionAttributes.cs
- RowTypeElement.cs