Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / ChangeBlockUndoRecord.cs / 1 / ChangeBlockUndoRecord.cs
//---------------------------------------------------------------------------- // // File: ChangeBlockUndoRecord.cs // // Description: Undo wrapper for any edit on or through a TextRange or // TextContainer. // //--------------------------------------------------------------------------- using System; using System.Windows; using MS.Internal; using MS.Internal.Documents; namespace System.Windows.Documents { // Undo wrapper for any edit on or through a TextRange or TextContainer. internal class ChangeBlockUndoRecord { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Constructor, called when a change block is opening. internal ChangeBlockUndoRecord(ITextContainer textContainer, string actionDescription) { if (textContainer.UndoManager != null) { _undoManager = textContainer.UndoManager; if (_undoManager.IsEnabled) { // Don't bother opening an undo unit if the owning control is // still being initialized (ie, programmatic load by parser). if (textContainer.TextView != null) { // Don't bother opening a new undo unit if we're already nested // inside another. if (_undoManager.OpenedUnit == null) { if (textContainer.TextSelection != null) { _parentUndoUnit = new TextParentUndoUnit(textContainer.TextSelection); } else { _parentUndoUnit = new ParentUndoUnit(actionDescription); } _undoManager.Open(_parentUndoUnit); } } else { // If the owning control isn't initialized (parser is still running), // don't add anything to the undo record. Instead, clear it. _undoManager.Clear(); } } } } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- #region Internal Methods // Called when a change block is closing. internal void OnEndChange() { // Commit our undo unit. if (_parentUndoUnit != null) { IParentUndoUnit openedUnit; if (_parentUndoUnit.Container is UndoManager) { openedUnit = ((UndoManager)_parentUndoUnit.Container).OpenedUnit; } else { openedUnit = ((IParentUndoUnit)_parentUndoUnit.Container).OpenedUnit; } // UIElementPropertyUndoUnit can clear the undo stack if a change is made to a databound property if (openedUnit == _parentUndoUnit) { if (_parentUndoUnit is TextParentUndoUnit) { ((TextParentUndoUnit)_parentUndoUnit).RecordRedoSelectionState(); } Invariant.Assert(_undoManager != null); _undoManager.Close(_parentUndoUnit, (_parentUndoUnit.LastUnit != null) ? UndoCloseAction.Commit : UndoCloseAction.Discard); } } } #endregion Internal Methods //------------------------------------------------------ // // Private Fields // //------------------------------------------------------ #region Private Fields private readonly UndoManager _undoManager; private readonly IParentUndoUnit _parentUndoUnit; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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