Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Framework / System / Windows / Documents / TextTreeUndoUnit.cs / 1 / TextTreeUndoUnit.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Base class for all TextContainer undo units. // // History: // 03/03/2004 : benwest - Created // //--------------------------------------------------------------------------- using System; using MS.Internal; using MS.Internal.Documents; 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!"); } } // Converts a LocalValueEnumerator into an array of PropertyRecords. // The array is safe to cache, LocalValueEnumerators are not. internal static PropertyRecord[] LocalValueEnumeratorToArray(LocalValueEnumerator valuesEnumerator) { PropertyRecord[] records = new PropertyRecord[valuesEnumerator.Count]; int count = 0; valuesEnumerator.Reset(); while (valuesEnumerator.MoveNext()) { DependencyProperty dp = valuesEnumerator.Current.Property; if (!dp.ReadOnly) { records[count].Property = dp; records[count].Value = valuesEnumerator.Current.Value; count++; } } PropertyRecord[] trimmedResult; if(valuesEnumerator.Count != count) { trimmedResult = new PropertyRecord[count]; for(int i=0; i// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Base class for all TextContainer undo units. // // History: // 03/03/2004 : benwest - Created // //--------------------------------------------------------------------------- using System; using MS.Internal; using MS.Internal.Documents; 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!"); } } // Converts a LocalValueEnumerator into an array of PropertyRecords. // The array is safe to cache, LocalValueEnumerators are not. internal static PropertyRecord[] LocalValueEnumeratorToArray(LocalValueEnumerator valuesEnumerator) { PropertyRecord[] records = new PropertyRecord[valuesEnumerator.Count]; int count = 0; valuesEnumerator.Reset(); while (valuesEnumerator.MoveNext()) { DependencyProperty dp = valuesEnumerator.Current.Property; if (!dp.ReadOnly) { records[count].Property = dp; records[count].Value = valuesEnumerator.Current.Value; count++; } } PropertyRecord[] trimmedResult; if(valuesEnumerator.Count != count) { trimmedResult = new PropertyRecord[count]; for(int i=0; i
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- BoundColumn.cs
- WebMessageBodyStyleHelper.cs
- PackageDigitalSignature.cs
- ItemList.cs
- SocketInformation.cs
- GcHandle.cs
- TextContainerChangeEventArgs.cs
- XmlSignatureManifest.cs
- XmlSchemaComplexContentExtension.cs
- DataControlFieldCell.cs
- ControlIdConverter.cs
- EventlogProvider.cs
- BitArray.cs
- ProcessStartInfo.cs
- AdjustableArrowCap.cs
- DependencyObjectProvider.cs
- ADMembershipUser.cs
- MergePropertyDescriptor.cs
- ConnectionInterfaceCollection.cs
- Utils.cs
- ResourceBinder.cs
- TemplateInstanceAttribute.cs
- DirectoryRootQuery.cs
- DataGridViewCell.cs
- ResourceProviderFactory.cs
- BuildProvider.cs
- AttributeEmitter.cs
- FlowPosition.cs
- SqlClientMetaDataCollectionNames.cs
- Timeline.cs
- EntityWrapperFactory.cs
- Transform3DGroup.cs
- XmlSchemaProviderAttribute.cs
- EntityContainer.cs
- ThreadStaticAttribute.cs
- ExpressionHelper.cs
- RuntimeResourceSet.cs
- WriteableBitmap.cs
- NamespaceCollection.cs
- SystemColorTracker.cs
- Int16KeyFrameCollection.cs
- LinqDataSourceView.cs
- NullableIntSumAggregationOperator.cs
- ScrollBar.cs
- UnsafeNativeMethods.cs
- MemberInfoSerializationHolder.cs
- TypedReference.cs
- Transform3DCollection.cs
- QuestionEventArgs.cs
- SHA1.cs
- SurrogateDataContract.cs
- FieldDescriptor.cs
- Activity.cs
- TreeViewBindingsEditorForm.cs
- NativeMethods.cs
- TableRow.cs
- DbConnectionStringBuilder.cs
- SortQuery.cs
- Timer.cs
- SrgsText.cs
- ControllableStoryboardAction.cs
- LinkArea.cs
- HijriCalendar.cs
- Int32KeyFrameCollection.cs
- FontResourceCache.cs
- HoistedLocals.cs
- XmlNamedNodeMap.cs
- shaper.cs
- ScrollProviderWrapper.cs
- PixelFormatConverter.cs
- CodeTypeMemberCollection.cs
- EdmFunctions.cs
- Wildcard.cs
- ProxyHwnd.cs
- ConditionChanges.cs
- RequestCache.cs
- TileBrush.cs
- IApplicationTrustManager.cs
- StrokeNodeData.cs
- SessionEndingCancelEventArgs.cs
- EditingCoordinator.cs
- EdmScalarPropertyAttribute.cs
- MetadataFile.cs
- ZipIOBlockManager.cs
- WebContext.cs
- OracleEncoding.cs
- CircleHotSpot.cs
- MessageFilterTable.cs
- SQlBooleanStorage.cs
- PersonalizableAttribute.cs
- InlinedAggregationOperatorEnumerator.cs
- DropShadowEffect.cs
- SmtpFailedRecipientsException.cs
- Base64Encoder.cs
- ListChangedEventArgs.cs
- CodeExporter.cs
- IisTraceListener.cs
- _SslStream.cs
- BitmapEffectState.cs
- OutputCacheSettingsSection.cs