Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / 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
- StoragePropertyMapping.cs
- DescriptionAttribute.cs
- WindowsFormsSectionHandler.cs
- TextEditor.cs
- ListViewGroup.cs
- XslTransform.cs
- ObjectParameter.cs
- TrustLevelCollection.cs
- OdbcErrorCollection.cs
- TextWriter.cs
- FilterUserControlBase.cs
- StackSpiller.cs
- PassportIdentity.cs
- SkinBuilder.cs
- ServiceDeploymentInfo.cs
- DebugHandleTracker.cs
- TextParagraphCache.cs
- CompositeCollection.cs
- XmlLoader.cs
- CheckPair.cs
- OdbcException.cs
- MemberInitExpression.cs
- AutomationFocusChangedEventArgs.cs
- PolyBezierSegment.cs
- ChannelManager.cs
- SchemaImporterExtension.cs
- RotateTransform3D.cs
- ObjectToModelValueConverter.cs
- ApplicationActivator.cs
- DtrList.cs
- HuffCodec.cs
- OracleSqlParser.cs
- SchemaSetCompiler.cs
- BamlRecordHelper.cs
- Claim.cs
- InputBinder.cs
- StringWriter.cs
- ResourceDictionaryCollection.cs
- DtdParser.cs
- FormsAuthenticationUserCollection.cs
- AssemblyNameEqualityComparer.cs
- DropDownList.cs
- ResourcesBuildProvider.cs
- TypeInitializationException.cs
- DataControlCommands.cs
- ExtenderProvidedPropertyAttribute.cs
- DbParameterHelper.cs
- SamlDelegatingWriter.cs
- BrowserCapabilitiesFactoryBase.cs
- SQLCharsStorage.cs
- InputBinder.cs
- DataRow.cs
- Atom10FormatterFactory.cs
- FolderBrowserDialog.cs
- IPGlobalProperties.cs
- TransportOutputChannel.cs
- RecognitionResult.cs
- OrderedDictionary.cs
- UserNameServiceElement.cs
- Membership.cs
- FullTrustAssemblyCollection.cs
- Timer.cs
- ComponentRenameEvent.cs
- FormCollection.cs
- ClientRuntimeConfig.cs
- CompiledRegexRunnerFactory.cs
- LineGeometry.cs
- BridgeDataReader.cs
- _ListenerRequestStream.cs
- BufferedGraphicsContext.cs
- UrlAuthFailedErrorFormatter.cs
- XmlDownloadManager.cs
- dataprotectionpermissionattribute.cs
- PointCollection.cs
- BindingCompleteEventArgs.cs
- CredentialCache.cs
- WebPartZoneBase.cs
- StringSource.cs
- CodeCatchClause.cs
- OdbcConnection.cs
- AuthenticationModuleElement.cs
- BufferModesCollection.cs
- QueueAccessMode.cs
- XMLSyntaxException.cs
- ListenerConnectionModeReader.cs
- Italic.cs
- AnonymousIdentificationSection.cs
- PerformanceCounterPermissionAttribute.cs
- GcHandle.cs
- InstanceBehavior.cs
- DesignerActionVerbList.cs
- CacheMode.cs
- LinearGradientBrush.cs
- TransformerInfoCollection.cs
- IsolationInterop.cs
- DateTimeSerializationSection.cs
- HttpFileCollection.cs
- NamedPipeTransportManager.cs
- BitmapEffectGroup.cs
- RealizationDrawingContextWalker.cs