Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / TextTreeExtractElementUndoUnit.cs / 1 / TextTreeExtractElementUndoUnit.cs
//---------------------------------------------------------------------------- // // File: TextTreeExtractElementUndoUnit.cs // // Description: Undo unit for TextContainer.ExtractElement calls. // // History: // 03/03/2004 : [....] - Created // //--------------------------------------------------------------------------- using System; using MS.Internal; namespace System.Windows.Documents { // Undo unit for TextContainer.ExtractElement calls. internal class TextTreeExtractElementUndoUnit : TextTreeUndoUnit { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Creates a new undo unit instance. internal TextTreeExtractElementUndoUnit(TextContainer tree, TextTreeTextElementNode elementNode) : base(tree, elementNode.GetSymbolOffset(tree.Generation)) { _symbolCount = elementNode.SymbolCount; _type = elementNode.TextElement.GetType(); _localValues = LocalValueEnumeratorToArray(elementNode.TextElement.GetLocalValueEnumerator()); _resources = elementNode.TextElement.Resources; // Table requires additional work for storing its Columns collection if (elementNode.TextElement is Table) { _columns = TextTreeDeleteContentUndoUnit.SaveColumns((Table)elementNode.TextElement); } } #endregion Constructors //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- #region Public Methods // Called by the undo manager. Restores tree state to its condition // when the unit was created. Assumes the tree state matches conditions // just after the unit was created. public override void DoCore() { TextPointer start; TextPointer end; TextElement element; VerifyTreeContentHashCode(); start = new TextPointer(this.TextContainer, this.SymbolOffset, LogicalDirection.Forward); end = new TextPointer(this.TextContainer, this.SymbolOffset + _symbolCount - 2, LogicalDirection.Forward); // Insert a new element. element = (TextElement)Activator.CreateInstance(_type); element.Reposition(start, end); // Restore local resources element.Resources = _resources; // Move end into the scope of the new element. end.MoveToNextContextPosition(LogicalDirection.Backward); // Then restore local property values. // this.TextContainer.SetValues(end, ArrayToLocalValueEnumerator(_localValues)); if (element is Table) { TextTreeDeleteContentUndoUnit.RestoreColumns((Table)element, _columns); } } #endregion Public Methods //------------------------------------------------------ // // Private Fields // //------------------------------------------------------ #region Private Fields // Count of symbols covered by the extracted TextElement, including its 2 edges. private readonly int _symbolCount; // Type of the extracted TextElement. private readonly Type _type; // Collection of all local property values set on the extracted TextElement. private readonly PropertyRecord []_localValues; // Resources defined locally on the TextElement private readonly ResourceDictionary _resources; // TableColumns collection private readonly TableColumn[] _columns; #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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