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 / 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
- ColorConvertedBitmapExtension.cs
- DataSourceCache.cs
- PrinterResolution.cs
- InputMethodStateTypeInfo.cs
- HtmlHistory.cs
- CustomError.cs
- SafeNativeMethods.cs
- CorrelationManager.cs
- GetKeyedHashRequest.cs
- ToolTipAutomationPeer.cs
- Image.cs
- HtmlTableCellCollection.cs
- OfTypeExpression.cs
- RelationshipNavigation.cs
- ListGeneralPage.cs
- EventManager.cs
- PersonalizationState.cs
- PointCollection.cs
- ToolStripTextBox.cs
- InlineCollection.cs
- ExtendedPropertyDescriptor.cs
- UserPersonalizationStateInfo.cs
- BamlRecordReader.cs
- MimeTextImporter.cs
- SmtpAuthenticationManager.cs
- XmlCountingReader.cs
- EntityTypeEmitter.cs
- MultilineStringConverter.cs
- ToolStripItemEventArgs.cs
- FixedSOMFixedBlock.cs
- GenericsInstances.cs
- OTFRasterizer.cs
- CellParagraph.cs
- UIElementCollection.cs
- HtmlSelect.cs
- Environment.cs
- WebHttpBehavior.cs
- OracleBFile.cs
- XmlSchemaAll.cs
- SqlDuplicator.cs
- PropVariant.cs
- SettingsProviderCollection.cs
- ScriptResourceInfo.cs
- precedingsibling.cs
- KeyManager.cs
- CompositeCollectionView.cs
- SimpleParser.cs
- ParserContext.cs
- ObjectSet.cs
- ServiceModelConfigurationSectionGroup.cs
- TraceListener.cs
- Stacktrace.cs
- DesignTimeTemplateParser.cs
- SubclassTypeValidatorAttribute.cs
- XamlSerializerUtil.cs
- BindingOperations.cs
- SBCSCodePageEncoding.cs
- ProcessModelSection.cs
- ContextMarshalException.cs
- AsyncOperation.cs
- RTLAwareMessageBox.cs
- MetadataCache.cs
- SqlGenericUtil.cs
- RemoteWebConfigurationHost.cs
- DataTableCollection.cs
- XPathBinder.cs
- TextBoxView.cs
- Events.cs
- Parser.cs
- VisualStyleTypesAndProperties.cs
- HttpRuntimeSection.cs
- ProgressBarRenderer.cs
- WriteTimeStream.cs
- PersonalizationStateInfo.cs
- BlockUIContainer.cs
- XslAst.cs
- InstanceDataCollection.cs
- WindowsAuthenticationModule.cs
- MissingSatelliteAssemblyException.cs
- UnsafeNativeMethodsCLR.cs
- ParameterCollection.cs
- DataGridViewAutoSizeModeEventArgs.cs
- HttpResponseInternalWrapper.cs
- SmiContextFactory.cs
- SEHException.cs
- JsonWriterDelegator.cs
- SchemaAttDef.cs
- ByteAnimationUsingKeyFrames.cs
- WhitespaceRuleLookup.cs
- MouseOverProperty.cs
- JobInputBins.cs
- FrameworkRichTextComposition.cs
- MatrixStack.cs
- QueueProcessor.cs
- ContentTypeSettingDispatchMessageFormatter.cs
- GeneralTransform2DTo3D.cs
- BaseCodeDomTreeGenerator.cs
- ObjectStateEntry.cs
- MessageBox.cs
- MD5HashHelper.cs