Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Framework / System / Windows / Documents / TextElementEnumerator.cs / 1 / TextElementEnumerator.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: IEnumerator for TextRange and TextElement content. // // // History: // 05/27/2003 : benwest - Created // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using MS.Internal; using System.Text; using MS.Utility; using System.Windows.Controls; #pragma warning disable 1634, 1691 // suppressing PreSharp warnings namespace System.Windows.Documents { internal class TextElementEnumerator: IEnumerator where TextElementType : TextElement { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Creates an enumerator instance. // Null start/end creates an empty enumerator. internal TextElementEnumerator(TextPointer start, TextPointer end) { Invariant.Assert(start != null && end != null || start == null && end == null, "If start is null end should be null!"); _start = start; _end = end; // Remember what generation the backing store was in when we started, // so we can throw if this enumerator is accessed after content has // changed. if (_start != null) { _generation = _start.TextContainer.Generation; } } #endregion Constructors //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- #region Public Methods public void Dispose() { // Empty the enumerator _current = null; _navigator = null; } object System.Collections.IEnumerator.Current { get { return this.Current; } } /// /// Return the current object this enumerator is pointing to. This is /// generally a FrameworkElement, TextElement, an embedded /// object, or Text content. /// ////// According to the IEnumerator spec, the Current property keeps /// the element even after the content has been modified /// (even if the current element has been deleted from the collection). /// This is unlike to Reset or MoveNext which throw after any content change. /// public TextElementType Current { get { if (_navigator == null) { #pragma warning suppress 6503 // IEnumerator.Current is documented to throw this exception throw new InvalidOperationException(SR.Get(SRID.EnumeratorNotStarted)); } if (_current == null) { #pragma warning suppress 6503 // IEnumerator.Current is documented to throw this exception throw new InvalidOperationException(SR.Get(SRID.EnumeratorReachedEnd)); } return _current; } } ////// Advance the enumerator to the next object in the range. Return true if content /// was found. /// public bool MoveNext() { // Throw if the tree has been modified since this enumerator was created. if (_start != null && _generation != _start.TextContainer.Generation) { throw new InvalidOperationException(SR.Get(SRID.EnumeratorVersionChanged)); } // Return false if the collection is empty if (_start == null || _start.CompareTo(_end) == 0) { return false; } // Return false if the navigator reached the end of the collection if (_navigator != null && _navigator.CompareTo(_end) >= 0) { return false; } // Advance the navigator if (_navigator == null) { // Set it to the first element for the very first move _navigator = new TextPointer(_start); _navigator.MoveToNextContextPosition(LogicalDirection.Forward); } else { // Move to the next element in the collection Invariant.Assert(_navigator.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.ElementStart, "Unexpected run type in TextElementEnumerator"); _navigator.MoveToElementEdge(ElementEdge.AfterEnd); _navigator.MoveToNextContextPosition(LogicalDirection.Forward); } // Update current cache if (_navigator.CompareTo(_end) < 0) { _current = (TextElementType)_navigator.Parent; } else { _current = null; } // Return true if the content was found return (_current != null); } ////// Reset the enumerator to the start of the range. /// public void Reset() { // Throw if the tree has been modified since this enumerator was created. if (_start != null && _generation != _start.TextContainer.Generation) { throw new InvalidOperationException(SR.Get(SRID.EnumeratorVersionChanged)); } _navigator = null; _current = null; } #endregion Public Methods //------------------------------------------------------ // // Public Properties // //------------------------------------------------------ #region Public Properties #endregion Public Properties //----------------------------------------------------- // // Public Events // //------------------------------------------------------ #region Public Events #endregion Public Events //----------------------------------------------------- // // Protected Methods // //----------------------------------------------------- #region Protected Methods #endregion Protected Events //----------------------------------------------------- // // Internal Methods // //------------------------------------------------------ #region Internal Methods #endregion Internal methods //----------------------------------------------------- // // Internal Properties // //------------------------------------------------------ #region Internal Properties #endregion Internal Properties //------------------------------------------------------ // // Internal Events // //----------------------------------------------------- #region Internal Events #endregion Internal Events //------------------------------------------------------ // // Private Properties // //----------------------------------------------------- #region Private Properties #endregion Private Properties //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- #region Private Fields // Edges of the span to enumerator over. private readonly TextPointer _start; private readonly TextPointer _end; // Backing store generation when this enumerator was created. private readonly uint _generation; // Current position in the enumeration. private TextPointer _navigator; // Calculated content at the current position. private TextElementType _current; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: IEnumerator for TextRange and TextElement content. // // // History: // 05/27/2003 : benwest - Created // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using MS.Internal; using System.Text; using MS.Utility; using System.Windows.Controls; #pragma warning disable 1634, 1691 // suppressing PreSharp warnings namespace System.Windows.Documents { internal class TextElementEnumerator: IEnumerator where TextElementType : TextElement { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // Creates an enumerator instance. // Null start/end creates an empty enumerator. internal TextElementEnumerator(TextPointer start, TextPointer end) { Invariant.Assert(start != null && end != null || start == null && end == null, "If start is null end should be null!"); _start = start; _end = end; // Remember what generation the backing store was in when we started, // so we can throw if this enumerator is accessed after content has // changed. if (_start != null) { _generation = _start.TextContainer.Generation; } } #endregion Constructors //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- #region Public Methods public void Dispose() { // Empty the enumerator _current = null; _navigator = null; } object System.Collections.IEnumerator.Current { get { return this.Current; } } /// /// Return the current object this enumerator is pointing to. This is /// generally a FrameworkElement, TextElement, an embedded /// object, or Text content. /// ////// According to the IEnumerator spec, the Current property keeps /// the element even after the content has been modified /// (even if the current element has been deleted from the collection). /// This is unlike to Reset or MoveNext which throw after any content change. /// public TextElementType Current { get { if (_navigator == null) { #pragma warning suppress 6503 // IEnumerator.Current is documented to throw this exception throw new InvalidOperationException(SR.Get(SRID.EnumeratorNotStarted)); } if (_current == null) { #pragma warning suppress 6503 // IEnumerator.Current is documented to throw this exception throw new InvalidOperationException(SR.Get(SRID.EnumeratorReachedEnd)); } return _current; } } ////// Advance the enumerator to the next object in the range. Return true if content /// was found. /// public bool MoveNext() { // Throw if the tree has been modified since this enumerator was created. if (_start != null && _generation != _start.TextContainer.Generation) { throw new InvalidOperationException(SR.Get(SRID.EnumeratorVersionChanged)); } // Return false if the collection is empty if (_start == null || _start.CompareTo(_end) == 0) { return false; } // Return false if the navigator reached the end of the collection if (_navigator != null && _navigator.CompareTo(_end) >= 0) { return false; } // Advance the navigator if (_navigator == null) { // Set it to the first element for the very first move _navigator = new TextPointer(_start); _navigator.MoveToNextContextPosition(LogicalDirection.Forward); } else { // Move to the next element in the collection Invariant.Assert(_navigator.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.ElementStart, "Unexpected run type in TextElementEnumerator"); _navigator.MoveToElementEdge(ElementEdge.AfterEnd); _navigator.MoveToNextContextPosition(LogicalDirection.Forward); } // Update current cache if (_navigator.CompareTo(_end) < 0) { _current = (TextElementType)_navigator.Parent; } else { _current = null; } // Return true if the content was found return (_current != null); } ////// Reset the enumerator to the start of the range. /// public void Reset() { // Throw if the tree has been modified since this enumerator was created. if (_start != null && _generation != _start.TextContainer.Generation) { throw new InvalidOperationException(SR.Get(SRID.EnumeratorVersionChanged)); } _navigator = null; _current = null; } #endregion Public Methods //------------------------------------------------------ // // Public Properties // //------------------------------------------------------ #region Public Properties #endregion Public Properties //----------------------------------------------------- // // Public Events // //------------------------------------------------------ #region Public Events #endregion Public Events //----------------------------------------------------- // // Protected Methods // //----------------------------------------------------- #region Protected Methods #endregion Protected Events //----------------------------------------------------- // // Internal Methods // //------------------------------------------------------ #region Internal Methods #endregion Internal methods //----------------------------------------------------- // // Internal Properties // //------------------------------------------------------ #region Internal Properties #endregion Internal Properties //------------------------------------------------------ // // Internal Events // //----------------------------------------------------- #region Internal Events #endregion Internal Events //------------------------------------------------------ // // Private Properties // //----------------------------------------------------- #region Private Properties #endregion Private Properties //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- #region Private Fields // Edges of the span to enumerator over. private readonly TextPointer _start; private readonly TextPointer _end; // Backing store generation when this enumerator was created. private readonly uint _generation; // Current position in the enumeration. private TextPointer _navigator; // Calculated content at the current position. private TextElementType _current; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- PageEventArgs.cs
- DropDownHolder.cs
- ByteKeyFrameCollection.cs
- RawStylusInputReport.cs
- FullTextState.cs
- RegexRunnerFactory.cs
- ProgressBarRenderer.cs
- PublisherMembershipCondition.cs
- DataRowCollection.cs
- XhtmlBasicLinkAdapter.cs
- TabOrder.cs
- EventListenerClientSide.cs
- DivideByZeroException.cs
- SettingsBase.cs
- CompositionAdorner.cs
- ProfileEventArgs.cs
- dbenumerator.cs
- WebReference.cs
- ResumeStoryboard.cs
- SmiMetaDataProperty.cs
- QilCloneVisitor.cs
- RectAnimationClockResource.cs
- SafeRsaProviderHandle.cs
- FocusManager.cs
- BoolExpressionVisitors.cs
- WindowsUpDown.cs
- SqlMultiplexer.cs
- WebPartMinimizeVerb.cs
- BaseAppDomainProtocolHandler.cs
- LabelEditEvent.cs
- DefaultParameterValueAttribute.cs
- LambdaValue.cs
- HMACRIPEMD160.cs
- ConnectionsZone.cs
- NullableBoolConverter.cs
- TextCompositionManager.cs
- TextElementEditingBehaviorAttribute.cs
- CqlLexerHelpers.cs
- Thumb.cs
- FixedStringLookup.cs
- SerializationFieldInfo.cs
- DrawingImage.cs
- CodeDelegateInvokeExpression.cs
- WebPartConnection.cs
- ExpandSegment.cs
- TagMapCollection.cs
- BooleanStorage.cs
- ObjectAnimationBase.cs
- UndoManager.cs
- DesignBinding.cs
- WindowsImpersonationContext.cs
- _NTAuthentication.cs
- DataGridViewRow.cs
- WorkerRequest.cs
- HttpCacheVaryByContentEncodings.cs
- FacetChecker.cs
- DataAccessor.cs
- FeatureSupport.cs
- InvalidCastException.cs
- Figure.cs
- SqlHelper.cs
- PageWrapper.cs
- QueryOutputWriter.cs
- ZoomingMessageFilter.cs
- DLinqTableProvider.cs
- ResolveMatches11.cs
- ProfileProvider.cs
- DataGridState.cs
- FileUtil.cs
- ServiceElement.cs
- SignedXml.cs
- TextEditorDragDrop.cs
- SystemResourceKey.cs
- XmlEncodedRawTextWriter.cs
- FixedSOMPageElement.cs
- CachedBitmap.cs
- BridgeDataRecord.cs
- DefaultValueConverter.cs
- EncryptedReference.cs
- ExecutionScope.cs
- StorageAssociationSetMapping.cs
- CodeArrayCreateExpression.cs
- TableCell.cs
- SapiRecoContext.cs
- ProtocolsConfiguration.cs
- GridViewColumn.cs
- CompareInfo.cs
- AddInController.cs
- EndpointAddressAugust2004.cs
- SystemBrushes.cs
- Validator.cs
- QueryConverter.cs
- FontWeights.cs
- GeneralTransform3D.cs
- EnumerableWrapperWeakToStrong.cs
- WpfGeneratedKnownTypes.cs
- XmlImplementation.cs
- X509ClientCertificateAuthenticationElement.cs
- AutomationElementCollection.cs
- SqlComparer.cs