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.
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