Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / TextTreeUndo.cs / 1305600 / 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
- StyleTypedPropertyAttribute.cs
- _UriSyntax.cs
- InputQueueChannel.cs
- InternalsVisibleToAttribute.cs
- CodeMemberProperty.cs
- QuotedStringFormatReader.cs
- SafeFileHandle.cs
- SafeFindHandle.cs
- Wrapper.cs
- CodeTypeDeclarationCollection.cs
- ToolStripTextBox.cs
- MobileListItem.cs
- WebPartDisplayModeCollection.cs
- HandlerBase.cs
- TypedReference.cs
- BindingContext.cs
- Image.cs
- LocatorPartList.cs
- LastQueryOperator.cs
- OdbcUtils.cs
- ContractsBCL.cs
- Debug.cs
- OneOfConst.cs
- ListenerConnectionDemuxer.cs
- BitmapEffectDrawingContextState.cs
- XmlTextWriter.cs
- DebuggerAttributes.cs
- TextTreeInsertElementUndoUnit.cs
- WindowsAltTab.cs
- VerbConverter.cs
- RegularExpressionValidator.cs
- DesignConnection.cs
- RTLAwareMessageBox.cs
- HtmlImage.cs
- TableLayoutStyleCollection.cs
- SafeCryptoHandles.cs
- FilteredDataSetHelper.cs
- ColorKeyFrameCollection.cs
- ThreadInterruptedException.cs
- VirtualPathData.cs
- basevalidator.cs
- ServiceDocumentFormatter.cs
- ExpressionsCollectionEditor.cs
- InputBuffer.cs
- UserValidatedEventArgs.cs
- UrlPropertyAttribute.cs
- DesignerLoader.cs
- DescendentsWalker.cs
- FramingDecoders.cs
- CallContext.cs
- DoWhile.cs
- SafePipeHandle.cs
- path.cs
- WindowsFormsLinkLabel.cs
- ProcessThreadCollection.cs
- Preprocessor.cs
- _FtpDataStream.cs
- QilInvokeLateBound.cs
- IDQuery.cs
- SystemGatewayIPAddressInformation.cs
- _OverlappedAsyncResult.cs
- LogAppendAsyncResult.cs
- Mapping.cs
- StylusCollection.cs
- TokenizerHelper.cs
- FileStream.cs
- FileAccessException.cs
- DataGridViewCellToolTipTextNeededEventArgs.cs
- UnionExpr.cs
- Win32PrintDialog.cs
- StrokeDescriptor.cs
- SettingsPropertyIsReadOnlyException.cs
- SqlProfileProvider.cs
- WindowsIPAddress.cs
- BaseHashHelper.cs
- ArgIterator.cs
- EntityProviderFactory.cs
- FatalException.cs
- ScriptControl.cs
- ChangeNode.cs
- ActivityDefaults.cs
- XmlSchemaInclude.cs
- Vector3DCollectionConverter.cs
- ValidateNames.cs
- WorkflowViewManager.cs
- ButtonBase.cs
- ExpanderAutomationPeer.cs
- StatusBarPanelClickEvent.cs
- XmlValidatingReaderImpl.cs
- ConnectivityStatus.cs
- DataGridViewCellCollection.cs
- FixUp.cs
- COM2Enum.cs
- HttpConfigurationContext.cs
- NoneExcludedImageIndexConverter.cs
- DataGridTablesFactory.cs
- Point4DConverter.cs
- RTLAwareMessageBox.cs
- RSAPKCS1SignatureDeformatter.cs
- AppSettingsReader.cs