TextEditorSpelling.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / TextEditorSpelling.cs / 1305600 / TextEditorSpelling.cs

                            //---------------------------------------------------------------------------- 
//
// File: TextEditorSpelling.cs
//
// Copyright (C) Microsoft Corporation.  All rights reserved. 
//
// Description: A Component of TextEditor supporting spelling. 
// 
//---------------------------------------------------------------------------
 
namespace System.Windows.Documents
{
    using MS.Internal;
    using System.Windows; 
    using System.Windows.Input;
    using MS.Internal.Commands; 
    using System.Windows.Controls; 
    using System.Windows.Markup; // XmlLanguage
 
    // A Component of TextEditor supporting spelling.
    internal static class TextEditorSpelling
    {
        //----------------------------------------------------- 
        //
        //  Class Internal Methods 
        // 
        //-----------------------------------------------------
 
        #region Class Internal Methods

        // Registers all text editing command handlers for a given control type
        internal static void _RegisterClassHandlers(Type controlType, bool registerEventListeners) 
        {
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.CorrectSpellingError, new ExecutedRoutedEventHandler(OnCorrectSpellingError), new CanExecuteRoutedEventHandler(OnQueryStatusSpellingError)); 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.IgnoreSpellingError, new ExecutedRoutedEventHandler(OnIgnoreSpellingError), new CanExecuteRoutedEventHandler(OnQueryStatusSpellingError)); 
        }
 
        // Worker for TextBox/RichTextBox.GetSpellingErrorAtPosition.
        internal static SpellingError GetSpellingErrorAtPosition(TextEditor This, ITextPointer position, LogicalDirection direction)
        {
            return (This.Speller == null) ? null : This.Speller.GetError(position, direction, true /* forceEvaluation */); 
        }
 
        // Returns the error (if any) at the current selection. 
        internal static SpellingError GetSpellingErrorAtSelection(TextEditor This)
        { 
            if (This.Speller == null)
            {
                return null;
            } 

            if (IsSelectionIgnoringErrors(This.Selection)) 
            { 
                // Some selection (large ones in particular) ignore errors.
                return null; 
            }

            // If the selection is empty, we want to respect its direction
            // when poking around for spelling errors. 
            // If it's non-empty, the selection start direction is always
            // backward, which is the opposite of what we want. 
            LogicalDirection direction = This.Selection.IsEmpty ? This.Selection.Start.LogicalDirection : LogicalDirection.Forward; 

            char character; 
            ITextPointer position = GetNextTextPosition(This.Selection.Start, null /* limit */, direction, out character);
            if (position == null)
            {
                // There is no next character -- flip direction. 
                // This is the end-of-document or end-of-paragraph case.
                direction = (direction == LogicalDirection.Forward) ? LogicalDirection.Backward : LogicalDirection.Forward; 
                position = GetNextTextPosition(This.Selection.Start, null /* limit */, direction, out character); 
            }
            else if (Char.IsWhiteSpace(character)) 
            {
                // If direction points to whitespace
                //   If the selection is empty
                //     Look in the opposite direction. 
                //   Else
                //     If the selection contains non-white space 
                //       Look at the first non-white space character forward. 
                //     Else
                //       Look in the opposite direction. 
                if (This.Selection.IsEmpty)
                {
                    direction = (direction == LogicalDirection.Forward) ? LogicalDirection.Backward : LogicalDirection.Forward;
                    position = GetNextTextPosition(This.Selection.Start, null /* limit */, direction, out character); 
                }
                else 
                { 
                    direction = LogicalDirection.Forward;
                    position = GetNextNonWhiteSpacePosition(This.Selection.Start, This.Selection.End); 
                    if (position == null)
                    {
                        direction = LogicalDirection.Backward;
                        position = GetNextTextPosition(This.Selection.Start, null /* limit */, direction, out character); 
                    }
                } 
            } 

            return (position == null) ? null : This.Speller.GetError(position, direction, false /* forceEvaluation */); 
        }

        // Worker for TextBox/RichTextBox.GetNextSpellingErrorPosition.
        internal static ITextPointer GetNextSpellingErrorPosition(TextEditor This, ITextPointer position, LogicalDirection direction) 
        {
            return (This.Speller == null) ? null : This.Speller.GetNextSpellingErrorPosition(position, direction); 
        } 

        #endregion Class Internal Methods 

        //------------------------------------------------------
        //
        //  Private Methods 
        //
        //----------------------------------------------------- 
 
        #region Private Methods
 
        // Callback for EditingCommands.CorrectSpellingError.
        //
        // Corrects the error pointed to by Selection.Start with the string
        // specified in args.Data. 
        private static void OnCorrectSpellingError(object target, ExecutedRoutedEventArgs args)
        { 
            TextEditor This = TextEditor._GetTextEditor(target); 
            if (This == null)
                return; 

            string correctedText = args.Parameter as string;
            if (correctedText == null)
                return; 

            SpellingError spellingError = GetSpellingErrorAtSelection(This); 
            if (spellingError == null) 
                return;
 
            using (This.Selection.DeclareChangeBlock())
            {
                ITextPointer textStart;
                ITextPointer textEnd; 
                bool dontUseRange = IsErrorAtNonMergeableInlineEdge(spellingError, out textStart, out textEnd);
 
                ITextPointer caretPosition; 

                if (dontUseRange && textStart is TextPointer) 
                {
                    // We need a cast because ITextPointer's equivalent to DeleteTextInRun (DeleteContentToPostiion)
                    // will remove empty TextElements, which we do not want.
                    ((TextPointer)textStart).DeleteTextInRun(textStart.GetOffsetToPosition(textEnd)); 
                    textStart.InsertTextInRun(correctedText);
                    caretPosition = textStart.CreatePointer(+correctedText.Length, LogicalDirection.Forward); 
                } 
                else
                { 
                    This.Selection.Select(spellingError.Start, spellingError.End);

                    // Setting range.Text to correctedText might inadvertantly apply previous Run's formatting properties.
                    // Save current formatting to avoid this. 
                    if (This.AcceptsRichContent)
                    { 
                        ((TextSelection)This.Selection).SpringloadCurrentFormatting(); 
                    }
 
                    // TextEditor.SetSelectedText() replaces current selection with new text and
                    // also applies any springloaded properties to the text.
                    XmlLanguage language = (XmlLanguage)spellingError.Start.GetValue(FrameworkElement.LanguageProperty);
                    This.SetSelectedText(correctedText, language.GetSpecificCulture()); 

                    caretPosition = This.Selection.End; 
                } 

                // Collapse the selection to a caret following the new text. 
                This.Selection.Select(caretPosition, caretPosition);
            }
        }
 
        // Returns true when one or both ends of the error lies at the inner edge of non-mergeable inline
        // such as Hyperlink.  In this case, a TextRange will normalize its ends outside 
        // the scope of the inline, and the corrected text will not be covered by it. 
        //
        // We work around the common case, when the error is contained within a single 
        // Run.  In more complex cases we'll fail and fall back to using a TextRange.
        private static bool IsErrorAtNonMergeableInlineEdge(SpellingError spellingError, out ITextPointer textStart, out ITextPointer textEnd)
        {
            bool result = false; 

            textStart = spellingError.Start.CreatePointer(LogicalDirection.Backward); 
            while (textStart.CompareTo(spellingError.End) < 0 && 
                   textStart.GetPointerContext(LogicalDirection.Forward) != TextPointerContext.Text)
            { 
                textStart.MoveToNextContextPosition(LogicalDirection.Forward);
            }
            textEnd = spellingError.End.CreatePointer();
            while (textEnd.CompareTo(spellingError.Start) > 0 && 
                   textEnd.GetPointerContext(LogicalDirection.Backward) != TextPointerContext.Text)
            { 
                textEnd.MoveToNextContextPosition(LogicalDirection.Backward); 
            }
 
            if (textStart.GetPointerContext(LogicalDirection.Forward) != TextPointerContext.Text ||
                textStart.CompareTo(spellingError.End) == 0)
            {
                return false; 
            }
            Invariant.Assert(textEnd.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.Text && 
                             textEnd.CompareTo(spellingError.Start) != 0); 

            if (TextPointerBase.IsAtNonMergeableInlineStart(textStart) || 
                TextPointerBase.IsAtNonMergeableInlineEnd(textEnd))
            {
                if (typeof(Run).IsAssignableFrom(textStart.ParentType) &&
                    textStart.HasEqualScope(textEnd)) 
                {
                    result = true; 
                } 
            }
 
            return result;
        }

        // Callback for EditingCommands.IgnoreSpellingError. 
        //
        // Ignores the error pointed to by Selection.Start and all other 
        // duplicates for the lifetime of the TextEditor. 
        private static void OnIgnoreSpellingError(object target, ExecutedRoutedEventArgs args)
        { 
            TextEditor This = TextEditor._GetTextEditor(target);
            if (This == null)
                return;
 
            SpellingError spellingError = GetSpellingErrorAtSelection(This);
            if (spellingError == null) 
                return; 

            spellingError.IgnoreAll(); 
        }

        // Callback for EditingCommands.CorrectSpellingError and EditingCommands.IgnoreSpellingError
        // QueryEnabled events. 
        //
        // Both commands are enabled if Selection.Start currently points to a spelling error. 
        private static void OnQueryStatusSpellingError(object target, CanExecuteRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(target); 
            if (This == null)
                return;

            SpellingError spellingError = GetSpellingErrorAtSelection(This); 

            args.CanExecute = (spellingError != null); 
        } 

        // Returns the position preceeding the next text character in a specified 
        // direction, or null if no such position exists.
        // The scan will halt if limit is encounted; limit may be null.
        private static ITextPointer GetNextTextPosition(ITextPointer position, ITextPointer limit, LogicalDirection direction, out char character)
        { 
            bool foundText = false;
 
            character = (char)0; 

            while (position != null && 
                   !foundText &&
                   (limit == null || position.CompareTo(limit) < 0))
            {
                switch (position.GetPointerContext(direction)) 
                {
                    case TextPointerContext.Text: 
                        char[] buffer = new char[1]; 
                        position.GetTextInRun(direction, buffer, 0, 1);
                        character = buffer[0]; 
                        foundText = true;
                        break;

                    case TextPointerContext.ElementStart: 
                    case TextPointerContext.ElementEnd:
                        if (TextSchema.IsFormattingType(position.GetElementType(direction))) 
                        { 
                            position = position.CreatePointer(+1);
                        } 
                        else
                        {
                            position = null;
                        } 
                        break;
 
                    case TextPointerContext.EmbeddedElement: 
                    case TextPointerContext.None:
                    default: 
                        position = null;
                        break;
                }
            } 

            return position; 
        } 

        // Returns the next non-white space character in the forward direction 
        // from position, or null if no such position exists.
        // The return value will equal position if position is immediately followed
        // by a non-whitespace char.
        // 
        // This method expects that limit is never null.  The scan will halt if
        // limit is encountered. 
        private static ITextPointer GetNextNonWhiteSpacePosition(ITextPointer position, ITextPointer limit) 
        {
            char character; 

            Invariant.Assert(limit != null);

            while (true) 
            {
                if (position.CompareTo(limit) == 0) 
                { 
                    position = null;
                    break; 
                }

                position = GetNextTextPosition(position, limit, LogicalDirection.Forward, out character);
 
                if (position == null)
                    break; 
 
                if (!Char.IsWhiteSpace(character))
                    break; 

                position = position.CreatePointer(+1);
            };
 
            return position;
        } 
 
        // Returns true if an ITextSelection isn't in a state where we want
        // to acknowledge spelling errors. 
        private static bool IsSelectionIgnoringErrors(ITextSelection selection)
        {
            bool isSelectionIgnoringErrors = false;
 
            // If the selection spans more than a single Block, ignore spelling errors.
            if (selection.Start is TextPointer) 
            { 
                isSelectionIgnoringErrors = ((TextPointer)selection.Start).ParentBlock != ((TextPointer)selection.End).ParentBlock;
            } 

            // If the selection is large, ignore spelling errors.
            if (!isSelectionIgnoringErrors)
            { 
                isSelectionIgnoringErrors = selection.Start.GetOffsetToPosition(selection.End) >= 256;
            } 
 
            // If the selection contains unicode line breaks, ignore spelling errors.
            if (!isSelectionIgnoringErrors) 
            {
                string text = selection.Text;

                for (int i = 0; i < text.Length && !isSelectionIgnoringErrors; i++) 
                {
                    isSelectionIgnoringErrors = TextPointerBase.IsCharUnicodeNewLine(text[i]); 
                } 
            }
 
            return isSelectionIgnoringErrors;
        }

        #endregion Private Methods 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//---------------------------------------------------------------------------- 
//
// File: TextEditorSpelling.cs
//
// Copyright (C) Microsoft Corporation.  All rights reserved. 
//
// Description: A Component of TextEditor supporting spelling. 
// 
//---------------------------------------------------------------------------
 
namespace System.Windows.Documents
{
    using MS.Internal;
    using System.Windows; 
    using System.Windows.Input;
    using MS.Internal.Commands; 
    using System.Windows.Controls; 
    using System.Windows.Markup; // XmlLanguage
 
    // A Component of TextEditor supporting spelling.
    internal static class TextEditorSpelling
    {
        //----------------------------------------------------- 
        //
        //  Class Internal Methods 
        // 
        //-----------------------------------------------------
 
        #region Class Internal Methods

        // Registers all text editing command handlers for a given control type
        internal static void _RegisterClassHandlers(Type controlType, bool registerEventListeners) 
        {
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.CorrectSpellingError, new ExecutedRoutedEventHandler(OnCorrectSpellingError), new CanExecuteRoutedEventHandler(OnQueryStatusSpellingError)); 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.IgnoreSpellingError, new ExecutedRoutedEventHandler(OnIgnoreSpellingError), new CanExecuteRoutedEventHandler(OnQueryStatusSpellingError)); 
        }
 
        // Worker for TextBox/RichTextBox.GetSpellingErrorAtPosition.
        internal static SpellingError GetSpellingErrorAtPosition(TextEditor This, ITextPointer position, LogicalDirection direction)
        {
            return (This.Speller == null) ? null : This.Speller.GetError(position, direction, true /* forceEvaluation */); 
        }
 
        // Returns the error (if any) at the current selection. 
        internal static SpellingError GetSpellingErrorAtSelection(TextEditor This)
        { 
            if (This.Speller == null)
            {
                return null;
            } 

            if (IsSelectionIgnoringErrors(This.Selection)) 
            { 
                // Some selection (large ones in particular) ignore errors.
                return null; 
            }

            // If the selection is empty, we want to respect its direction
            // when poking around for spelling errors. 
            // If it's non-empty, the selection start direction is always
            // backward, which is the opposite of what we want. 
            LogicalDirection direction = This.Selection.IsEmpty ? This.Selection.Start.LogicalDirection : LogicalDirection.Forward; 

            char character; 
            ITextPointer position = GetNextTextPosition(This.Selection.Start, null /* limit */, direction, out character);
            if (position == null)
            {
                // There is no next character -- flip direction. 
                // This is the end-of-document or end-of-paragraph case.
                direction = (direction == LogicalDirection.Forward) ? LogicalDirection.Backward : LogicalDirection.Forward; 
                position = GetNextTextPosition(This.Selection.Start, null /* limit */, direction, out character); 
            }
            else if (Char.IsWhiteSpace(character)) 
            {
                // If direction points to whitespace
                //   If the selection is empty
                //     Look in the opposite direction. 
                //   Else
                //     If the selection contains non-white space 
                //       Look at the first non-white space character forward. 
                //     Else
                //       Look in the opposite direction. 
                if (This.Selection.IsEmpty)
                {
                    direction = (direction == LogicalDirection.Forward) ? LogicalDirection.Backward : LogicalDirection.Forward;
                    position = GetNextTextPosition(This.Selection.Start, null /* limit */, direction, out character); 
                }
                else 
                { 
                    direction = LogicalDirection.Forward;
                    position = GetNextNonWhiteSpacePosition(This.Selection.Start, This.Selection.End); 
                    if (position == null)
                    {
                        direction = LogicalDirection.Backward;
                        position = GetNextTextPosition(This.Selection.Start, null /* limit */, direction, out character); 
                    }
                } 
            } 

            return (position == null) ? null : This.Speller.GetError(position, direction, false /* forceEvaluation */); 
        }

        // Worker for TextBox/RichTextBox.GetNextSpellingErrorPosition.
        internal static ITextPointer GetNextSpellingErrorPosition(TextEditor This, ITextPointer position, LogicalDirection direction) 
        {
            return (This.Speller == null) ? null : This.Speller.GetNextSpellingErrorPosition(position, direction); 
        } 

        #endregion Class Internal Methods 

        //------------------------------------------------------
        //
        //  Private Methods 
        //
        //----------------------------------------------------- 
 
        #region Private Methods
 
        // Callback for EditingCommands.CorrectSpellingError.
        //
        // Corrects the error pointed to by Selection.Start with the string
        // specified in args.Data. 
        private static void OnCorrectSpellingError(object target, ExecutedRoutedEventArgs args)
        { 
            TextEditor This = TextEditor._GetTextEditor(target); 
            if (This == null)
                return; 

            string correctedText = args.Parameter as string;
            if (correctedText == null)
                return; 

            SpellingError spellingError = GetSpellingErrorAtSelection(This); 
            if (spellingError == null) 
                return;
 
            using (This.Selection.DeclareChangeBlock())
            {
                ITextPointer textStart;
                ITextPointer textEnd; 
                bool dontUseRange = IsErrorAtNonMergeableInlineEdge(spellingError, out textStart, out textEnd);
 
                ITextPointer caretPosition; 

                if (dontUseRange && textStart is TextPointer) 
                {
                    // We need a cast because ITextPointer's equivalent to DeleteTextInRun (DeleteContentToPostiion)
                    // will remove empty TextElements, which we do not want.
                    ((TextPointer)textStart).DeleteTextInRun(textStart.GetOffsetToPosition(textEnd)); 
                    textStart.InsertTextInRun(correctedText);
                    caretPosition = textStart.CreatePointer(+correctedText.Length, LogicalDirection.Forward); 
                } 
                else
                { 
                    This.Selection.Select(spellingError.Start, spellingError.End);

                    // Setting range.Text to correctedText might inadvertantly apply previous Run's formatting properties.
                    // Save current formatting to avoid this. 
                    if (This.AcceptsRichContent)
                    { 
                        ((TextSelection)This.Selection).SpringloadCurrentFormatting(); 
                    }
 
                    // TextEditor.SetSelectedText() replaces current selection with new text and
                    // also applies any springloaded properties to the text.
                    XmlLanguage language = (XmlLanguage)spellingError.Start.GetValue(FrameworkElement.LanguageProperty);
                    This.SetSelectedText(correctedText, language.GetSpecificCulture()); 

                    caretPosition = This.Selection.End; 
                } 

                // Collapse the selection to a caret following the new text. 
                This.Selection.Select(caretPosition, caretPosition);
            }
        }
 
        // Returns true when one or both ends of the error lies at the inner edge of non-mergeable inline
        // such as Hyperlink.  In this case, a TextRange will normalize its ends outside 
        // the scope of the inline, and the corrected text will not be covered by it. 
        //
        // We work around the common case, when the error is contained within a single 
        // Run.  In more complex cases we'll fail and fall back to using a TextRange.
        private static bool IsErrorAtNonMergeableInlineEdge(SpellingError spellingError, out ITextPointer textStart, out ITextPointer textEnd)
        {
            bool result = false; 

            textStart = spellingError.Start.CreatePointer(LogicalDirection.Backward); 
            while (textStart.CompareTo(spellingError.End) < 0 && 
                   textStart.GetPointerContext(LogicalDirection.Forward) != TextPointerContext.Text)
            { 
                textStart.MoveToNextContextPosition(LogicalDirection.Forward);
            }
            textEnd = spellingError.End.CreatePointer();
            while (textEnd.CompareTo(spellingError.Start) > 0 && 
                   textEnd.GetPointerContext(LogicalDirection.Backward) != TextPointerContext.Text)
            { 
                textEnd.MoveToNextContextPosition(LogicalDirection.Backward); 
            }
 
            if (textStart.GetPointerContext(LogicalDirection.Forward) != TextPointerContext.Text ||
                textStart.CompareTo(spellingError.End) == 0)
            {
                return false; 
            }
            Invariant.Assert(textEnd.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.Text && 
                             textEnd.CompareTo(spellingError.Start) != 0); 

            if (TextPointerBase.IsAtNonMergeableInlineStart(textStart) || 
                TextPointerBase.IsAtNonMergeableInlineEnd(textEnd))
            {
                if (typeof(Run).IsAssignableFrom(textStart.ParentType) &&
                    textStart.HasEqualScope(textEnd)) 
                {
                    result = true; 
                } 
            }
 
            return result;
        }

        // Callback for EditingCommands.IgnoreSpellingError. 
        //
        // Ignores the error pointed to by Selection.Start and all other 
        // duplicates for the lifetime of the TextEditor. 
        private static void OnIgnoreSpellingError(object target, ExecutedRoutedEventArgs args)
        { 
            TextEditor This = TextEditor._GetTextEditor(target);
            if (This == null)
                return;
 
            SpellingError spellingError = GetSpellingErrorAtSelection(This);
            if (spellingError == null) 
                return; 

            spellingError.IgnoreAll(); 
        }

        // Callback for EditingCommands.CorrectSpellingError and EditingCommands.IgnoreSpellingError
        // QueryEnabled events. 
        //
        // Both commands are enabled if Selection.Start currently points to a spelling error. 
        private static void OnQueryStatusSpellingError(object target, CanExecuteRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(target); 
            if (This == null)
                return;

            SpellingError spellingError = GetSpellingErrorAtSelection(This); 

            args.CanExecute = (spellingError != null); 
        } 

        // Returns the position preceeding the next text character in a specified 
        // direction, or null if no such position exists.
        // The scan will halt if limit is encounted; limit may be null.
        private static ITextPointer GetNextTextPosition(ITextPointer position, ITextPointer limit, LogicalDirection direction, out char character)
        { 
            bool foundText = false;
 
            character = (char)0; 

            while (position != null && 
                   !foundText &&
                   (limit == null || position.CompareTo(limit) < 0))
            {
                switch (position.GetPointerContext(direction)) 
                {
                    case TextPointerContext.Text: 
                        char[] buffer = new char[1]; 
                        position.GetTextInRun(direction, buffer, 0, 1);
                        character = buffer[0]; 
                        foundText = true;
                        break;

                    case TextPointerContext.ElementStart: 
                    case TextPointerContext.ElementEnd:
                        if (TextSchema.IsFormattingType(position.GetElementType(direction))) 
                        { 
                            position = position.CreatePointer(+1);
                        } 
                        else
                        {
                            position = null;
                        } 
                        break;
 
                    case TextPointerContext.EmbeddedElement: 
                    case TextPointerContext.None:
                    default: 
                        position = null;
                        break;
                }
            } 

            return position; 
        } 

        // Returns the next non-white space character in the forward direction 
        // from position, or null if no such position exists.
        // The return value will equal position if position is immediately followed
        // by a non-whitespace char.
        // 
        // This method expects that limit is never null.  The scan will halt if
        // limit is encountered. 
        private static ITextPointer GetNextNonWhiteSpacePosition(ITextPointer position, ITextPointer limit) 
        {
            char character; 

            Invariant.Assert(limit != null);

            while (true) 
            {
                if (position.CompareTo(limit) == 0) 
                { 
                    position = null;
                    break; 
                }

                position = GetNextTextPosition(position, limit, LogicalDirection.Forward, out character);
 
                if (position == null)
                    break; 
 
                if (!Char.IsWhiteSpace(character))
                    break; 

                position = position.CreatePointer(+1);
            };
 
            return position;
        } 
 
        // Returns true if an ITextSelection isn't in a state where we want
        // to acknowledge spelling errors. 
        private static bool IsSelectionIgnoringErrors(ITextSelection selection)
        {
            bool isSelectionIgnoringErrors = false;
 
            // If the selection spans more than a single Block, ignore spelling errors.
            if (selection.Start is TextPointer) 
            { 
                isSelectionIgnoringErrors = ((TextPointer)selection.Start).ParentBlock != ((TextPointer)selection.End).ParentBlock;
            } 

            // If the selection is large, ignore spelling errors.
            if (!isSelectionIgnoringErrors)
            { 
                isSelectionIgnoringErrors = selection.Start.GetOffsetToPosition(selection.End) >= 256;
            } 
 
            // If the selection contains unicode line breaks, ignore spelling errors.
            if (!isSelectionIgnoringErrors) 
            {
                string text = selection.Text;

                for (int i = 0; i < text.Length && !isSelectionIgnoringErrors; i++) 
                {
                    isSelectionIgnoringErrors = TextPointerBase.IsCharUnicodeNewLine(text[i]); 
                } 
            }
 
            return isSelectionIgnoringErrors;
        }

        #endregion Private Methods 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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