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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / TextTreeUndoUnit.cs / 1305600 / TextTreeUndoUnit.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Base class for all TextContainer undo units. // // History: // 03/03/2004 : [....] - Created // //--------------------------------------------------------------------------- using System; using MS.Internal; using MS.Internal.Documents; using System.Windows.Data; namespace System.Windows.Documents { // Base class for all TextContainer undo units. internal abstract class TextTreeUndoUnit : IUndoUnit { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Create a new undo unit instance. internal TextTreeUndoUnit(TextContainer tree, int symbolOffset) { _tree = tree; _symbolOffset = symbolOffset; _treeContentHashCode = _tree.GetContentHashCode(); } #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 void Do() { _tree.BeginChange(); try { DoCore(); } finally { _tree.EndChange(); } } // Worker for Do method, implemented by derived class. public abstract void DoCore(); // Called by the undo manager. TextContainer undo units never merge. public bool Merge(IUndoUnit unit) { Invariant.Assert(unit != null); return false; } #endregion Public Methods //------------------------------------------------------ // // Protected Properties // //------------------------------------------------------ #region Protected Properties // TextContainer associated with this undo unit. protected TextContainer TextContainer { get { return _tree; } } // Offset in symbols of this undo unit within the TextContainer content. protected int SymbolOffset { get { return _symbolOffset; } } #endregion Protected Properties //----------------------------------------------------- // // Internal Methods // //------------------------------------------------------ #region Internal Methods // Explicitly sets this undo unit's content hash code to match the // current tree state. This happens automatically in the ctor, but // some undo units (for delte operations) need to be initialized before // the content is modified, in which case they call this method // afterwards. internal void SetTreeHashCode() { _treeContentHashCode = _tree.GetContentHashCode(); } // Verifies the TextContainer state matches the original state when this undo // unit was created. Because we use symbol offsets to track the // position of the content to modify, errors in the undo code or reentrant // document edits by random code could potentially // corrupt data rather than raise an immediate exception. // // This method uses Invariant.Assert to trigger a FailFast in the case an error // is detected, before we get a chance to corrupt data. internal void VerifyTreeContentHashCode() { if (_tree.GetContentHashCode() != _treeContentHashCode) { // Data is irrecoverably corrupted, shut down! Invariant.Assert(false, "Undo unit is out of [....] with TextContainer!"); } } // Gets an array of PropertyRecords from a DependencyObject's LocalValueEnumerator. // The array is safe to cache, LocalValueEnumerators are not. internal static PropertyRecord[] GetPropertyRecordArray(DependencyObject d) { LocalValueEnumerator valuesEnumerator = d.GetLocalValueEnumerator(); PropertyRecord[] records = new PropertyRecord[valuesEnumerator.Count]; int count = 0; valuesEnumerator.Reset(); while (valuesEnumerator.MoveNext()) { DependencyProperty dp = valuesEnumerator.Current.Property; if (!dp.ReadOnly) { // LocalValueEntry.Value can be an Expression, which we can't duplicate when we // undo, so we copy over the current value from DependencyObject.GetValue instead. records[count].Property = dp; records[count].Value = d.GetValue(dp); count++; } } PropertyRecord[] trimmedResult; if(valuesEnumerator.Count != count) { trimmedResult = new PropertyRecord[count]; for(int i=0; i
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