TextEditorCharacters.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 / TextEditorCharacters.cs / 1305600 / TextEditorCharacters.cs

                            //---------------------------------------------------------------------------- 
//
// File: TextEditorCharacters.cs
//
// Copyright (C) Microsoft Corporation.  All rights reserved. 
//
// Description: A component of TextEditor supporting character formatting commands 
// 
//---------------------------------------------------------------------------
 
namespace System.Windows.Documents
{
    using MS.Internal;
    using System.Globalization; 
    using System.Threading;
    using System.ComponentModel; 
    using System.Text; 
    using System.Collections; // ArrayList
    using System.Runtime.InteropServices; 

    using System.Windows.Threading;
    using System.Windows.Input;
    using System.Windows.Controls; // ScrollChangedEventArgs 
    using System.Windows.Controls.Primitives;  // CharacterCasing, TextBoxBase
    using System.Windows.Media; 
    using System.Windows.Markup; 

    using MS.Utility; 
    using MS.Win32;
    using MS.Internal.Documents;
    using MS.Internal.Commands; // CommandHelpers
 
    /// 
    /// Text editing service for controls. 
    ///  
    internal static class TextEditorCharacters
    { 
        //-----------------------------------------------------
        //
        //  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)
        {
            var onQueryStatusNYI = new CanExecuteRoutedEventHandler(OnQueryStatusNYI);
 
            // Editing Commands: Character Editing
            // ----------------------------------- 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ResetFormat                  , new ExecutedRoutedEventHandler(OnResetFormat)       , onQueryStatusNYI, SRID.KeyResetFormat, SRID.KeyResetFormatDisplayString); 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ToggleBold                   , new ExecutedRoutedEventHandler(OnToggleBold)        , onQueryStatusNYI, SRID.KeyToggleBold, SRID.KeyToggleBoldDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ToggleItalic                 , new ExecutedRoutedEventHandler(OnToggleItalic)      , onQueryStatusNYI, SRID.KeyToggleItalic, SRID.KeyToggleItalicDisplayString); 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ToggleUnderline              , new ExecutedRoutedEventHandler(OnToggleUnderline)   , onQueryStatusNYI, SRID.KeyToggleUnderline, SRID.KeyToggleUnderlineDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ToggleSubscript              , new ExecutedRoutedEventHandler(OnToggleSubscript)   , onQueryStatusNYI, SRID.KeyToggleSubscript, SRID.KeyToggleSubscriptDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ToggleSuperscript            , new ExecutedRoutedEventHandler(OnToggleSuperscript) , onQueryStatusNYI, SRID.KeyToggleSuperscript, SRID.KeyToggleSuperscriptDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.IncreaseFontSize             , new ExecutedRoutedEventHandler(OnIncreaseFontSize)  , onQueryStatusNYI, SRID.KeyIncreaseFontSize, SRID.KeyIncreaseFontSizeDisplayString); 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.DecreaseFontSize             , new ExecutedRoutedEventHandler(OnDecreaseFontSize)  , onQueryStatusNYI, SRID.KeyDecreaseFontSize, SRID.KeyDecreaseFontSizeDisplayString);
 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ApplyFontSize                , new ExecutedRoutedEventHandler(OnApplyFontSize)     , onQueryStatusNYI, SRID.KeyApplyFontSize, SRID.KeyApplyFontSizeDisplayString); 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ApplyFontFamily              , new ExecutedRoutedEventHandler(OnApplyFontFamily)   , onQueryStatusNYI, SRID.KeyApplyFontFamily, SRID.KeyApplyFontFamilyDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ApplyForeground              , new ExecutedRoutedEventHandler(OnApplyForeground)   , onQueryStatusNYI, SRID.KeyApplyForeground, SRID.KeyApplyForegroundDisplayString); 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ApplyBackground              , new ExecutedRoutedEventHandler(OnApplyBackground)   , onQueryStatusNYI, SRID.KeyApplyBackground, SRID.KeyApplyBackgroundDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ToggleSpellCheck             , new ExecutedRoutedEventHandler(OnToggleSpellCheck)  , onQueryStatusNYI, SRID.KeyToggleSpellCheck, SRID.KeyToggleSpellCheckDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ApplyInlineFlowDirectionRTL  , new ExecutedRoutedEventHandler(OnApplyInlineFlowDirectionRTL), new CanExecuteRoutedEventHandler(OnQueryStatusNYI));
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ApplyInlineFlowDirectionLTR  , new ExecutedRoutedEventHandler(OnApplyInlineFlowDirectionLTR), new CanExecuteRoutedEventHandler(OnQueryStatusNYI)); 
        }
 
        // A common method for all formatting commands. 
        // Applies a property to current selection.
        // Takes care of toggling operations (like bold/italic). 
        // Creates undo unit for this action.
        internal static void _OnApplyProperty(TextEditor This, DependencyProperty formattingProperty, object propertyValue)
        {
            _OnApplyProperty(This, formattingProperty, propertyValue, /*applyToParagraphs*/false, PropertyValueAction.SetValue); 
        }
 
        internal static void _OnApplyProperty(TextEditor This, DependencyProperty formattingProperty, object propertyValue, bool applyToParagraphs) 
        {
            _OnApplyProperty(This, formattingProperty, propertyValue, applyToParagraphs, PropertyValueAction.SetValue); 
        }

        internal static void _OnApplyProperty(TextEditor This, DependencyProperty formattingProperty, object propertyValue, bool applyToParagraphs, PropertyValueAction propertyValueAction)
        { 
            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection))
            { 
                return; 
            }
 
            // Check whether the property is known
            if (!TextSchema.IsParagraphProperty(formattingProperty) && !TextSchema.IsCharacterProperty(formattingProperty))
            {
                Invariant.Assert(false, "The property '" + formattingProperty.Name + "' is unknown to TextEditor"); 
                return;
            } 
 
            TextSelection selection = (TextSelection)This.Selection;
 
            if (TextSchema.IsStructuralCharacterProperty(formattingProperty) &&
                !TextRangeEdit.CanApplyStructuralInlineProperty(selection.Start, selection.End))
            {
                // Ignore structural commands fires in inappropriate context. 
                return;
            } 
 
            TextEditorTyping._FlushPendingInputItems(This);
 
            // Forget previously suggested horizontal position
            TextEditorSelection._ClearSuggestedX(This);

            // Break merged typing sequence 
            TextEditorTyping._BreakTypingSequence(This);
 
            // Apply property 
            selection.ApplyPropertyValue(formattingProperty, propertyValue, applyToParagraphs, propertyValueAction);
        } 

        #endregion Class Internal Methods

        //------------------------------------------------------ 
        //
        //  Private Methods 
        // 
        //-----------------------------------------------------
 
        #region Private Methods

        // ................................................................
        // 
        // Editing Commands: Character Editing
        // 
        // ................................................................ 

        private static void OnResetFormat(object target, ExecutedRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(target);

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection.Start is TextPointer)) 
            {
                return; 
            } 

            TextEditorTyping._FlushPendingInputItems(This); 

            using (This.Selection.DeclareChangeBlock())
            {
                // Positions to clear all inline formatting properties 
                TextPointer startResetFormatPosition = (TextPointer)This.Selection.Start;
                TextPointer endResetFormatPosition = (TextPointer)This.Selection.End; 
 
                if (This.Selection.IsEmpty)
                { 
                    TextSegment autoWordRange = TextRangeBase.GetAutoWord(This.Selection);
                    if (autoWordRange.IsNull)
                    {
                        // Clear springloaded formatting 
                        ((TextSelection)This.Selection).ClearSpringloadFormatting();
                        return; 
                    } 
                    else
                    { 
                        // If we have a word, apply reset format to it
                        startResetFormatPosition = (TextPointer)autoWordRange.Start;
                        endResetFormatPosition = (TextPointer)autoWordRange.End;
                    } 
                }
 
                // Forget previously suggested horizontal position 
                TextEditorSelection._ClearSuggestedX(This);
 
                // Clear all inline formattings
                TextRangeEdit.CharacterResetFormatting(startResetFormatPosition, endResetFormatPosition);
            }
        } 

        ///  
        /// ToggleBold command event handler. 
        /// 
        private static void OnToggleBold(object target, ExecutedRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(target);

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection)) 
            {
                return; 
            } 

            TextEditorTyping._FlushPendingInputItems(This); 

            object propertyValue = ((TextSelection)This.Selection).GetCurrentValue(TextElement.FontWeightProperty);
            FontWeight fontWeight = (propertyValue != DependencyProperty.UnsetValue && (FontWeight)propertyValue == FontWeights.Bold) ? FontWeights.Normal : FontWeights.Bold;
 
            TextEditorCharacters._OnApplyProperty(This, TextElement.FontWeightProperty, fontWeight);
        } 
 
        /// 
        /// ToggleItalic command event handler. 
        /// 
        private static void OnToggleItalic(object target, ExecutedRoutedEventArgs args)
        {
            TextEditor This = TextEditor._GetTextEditor(target); 

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection)) 
            { 
                return;
            } 

            TextEditorTyping._FlushPendingInputItems(This);

            object propertyValue = ((TextSelection)This.Selection).GetCurrentValue(TextElement.FontStyleProperty); 
            FontStyle fontStyle = (propertyValue != DependencyProperty.UnsetValue && (FontStyle)propertyValue == FontStyles.Italic) ? FontStyles.Normal : FontStyles.Italic;
 
            TextEditorCharacters._OnApplyProperty(This, TextElement.FontStyleProperty, fontStyle); 

            // Update the caret to show it as italic or normal caret. 
            This.Selection.RefreshCaret();
        }

        ///  
        /// ToggleUnderline command event handler.
        ///  
        private static void OnToggleUnderline(object target, ExecutedRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(target); 

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection))
            {
                return; 
            }
 
            TextEditorTyping._FlushPendingInputItems(This); 

            object propertyValue = ((TextSelection)This.Selection).GetCurrentValue(Inline.TextDecorationsProperty); 
            TextDecorationCollection textDecorations = propertyValue != DependencyProperty.UnsetValue ? (TextDecorationCollection)propertyValue : null;

            if (!TextSchema.HasTextDecorations(textDecorations))
            { 
                textDecorations = TextDecorations.Underline;
            } 
            else 
            {
                textDecorations = new TextDecorationCollection(); // empty collection - no underline 
            }

            TextEditorCharacters._OnApplyProperty(This, Inline.TextDecorationsProperty, textDecorations);
        } 

        // Command handler for Ctrl+"+" key (non-numpad) 
        private static void OnToggleSubscript(object sender, ExecutedRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(sender); 

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection))
            {
                return; 
            }
 
            TextEditorTyping._FlushPendingInputItems(This); 

            FontVariants fontVariants = (FontVariants)((TextSelection)This.Selection).GetCurrentValue(Typography.VariantsProperty); 

            fontVariants = fontVariants == FontVariants.Subscript ? FontVariants.Normal : FontVariants.Subscript;

            TextEditorCharacters._OnApplyProperty(This, Typography.VariantsProperty, fontVariants); 
        }
 
        // Command handler fro Ctrl+Shift+"+" (non-numpad) 
        private static void OnToggleSuperscript(object sender, ExecutedRoutedEventArgs args)
        { 
            TextEditor This = TextEditor._GetTextEditor(sender);

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection))
            { 
                return;
            } 
 
            TextEditorTyping._FlushPendingInputItems(This);
 
            FontVariants fontVariants = (FontVariants)((TextSelection)This.Selection).GetCurrentValue(Typography.VariantsProperty);

            fontVariants = fontVariants == FontVariants.Superscript ? FontVariants.Normal : FontVariants.Superscript;
 
            TextEditorCharacters._OnApplyProperty(This, Typography.VariantsProperty, fontVariants);
        } 
 
        // Used in IncreaseFontSize and DecreaseFontSize commands
        internal const double OneFontPoint = 72.0 / 96.0; 

        // The limiting constant is taken from Word UI - it suggests to choose font size from a range between 1 and 1638.
        //
        internal const double MaxFontPoint = 1638.0; 

        ///  
        /// IncreaseFontSize command event handler 
        /// 
        private static void OnIncreaseFontSize(object target, ExecutedRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(target);

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection)) 
            {
                return; 
            } 

            TextEditorTyping._FlushPendingInputItems(This); 

            if (This.Selection.IsEmpty)
            {
                // Springload an increased font size 
                double fontSize = (double)((TextSelection)This.Selection).GetCurrentValue(TextElement.FontSizeProperty);
                if (fontSize == 0.0) 
                { 
                    return; // no characters available for font operation
                } 

                if (fontSize < TextEditorCharacters.MaxFontPoint)
                {
                    fontSize += TextEditorCharacters.OneFontPoint; 
                    if (fontSize > TextEditorCharacters.MaxFontPoint)
                    { 
                        fontSize = TextEditorCharacters.MaxFontPoint; 
                    }
 
                    // The limiting constant is taken from Word UI - it suggests to choose font size from a range between 1 and 1638.
                    TextEditorCharacters._OnApplyProperty(This, TextElement.FontSizeProperty, fontSize);
                }
            } 
            else
            { 
                // Apply font size in incremental mode to a nonempty selection 
                TextEditorCharacters._OnApplyProperty(This, TextElement.FontSizeProperty, OneFontPoint, /*applyToParagraphs:*/false, PropertyValueAction.IncreaseByAbsoluteValue);
            } 
        }

        /// 
        /// DecreaseFontSize command event handler 
        /// 
        private static void OnDecreaseFontSize(object target, ExecutedRoutedEventArgs args) 
        { 
            TextEditor This = TextEditor._GetTextEditor(target);
 
            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection))
            {
                return;
            } 

            TextEditorTyping._FlushPendingInputItems(This); 
 
            if (This.Selection.IsEmpty)
            { 
                // Springload a decreased font size
                double fontSize = (double)((TextSelection)This.Selection).GetCurrentValue(TextElement.FontSizeProperty);
                if (fontSize == 0.0)
                { 
                    return; // no characters available for font operation
                } 
 
                if (fontSize > TextEditorCharacters.OneFontPoint)
                { 
                    fontSize -= TextEditorCharacters.OneFontPoint;
                    if (fontSize < TextEditorCharacters.OneFontPoint)
                    {
                        fontSize = TextEditorCharacters.OneFontPoint; 
                    }
 
                    TextEditorCharacters._OnApplyProperty(This, TextElement.FontSizeProperty, fontSize); 
                }
            } 
            else
            {
                // Apply font size in decremental mode to a nonempty selection
                TextEditorCharacters._OnApplyProperty(This, TextElement.FontSizeProperty, OneFontPoint, /*applyToParagraphs:*/false, PropertyValueAction.DecreaseByAbsoluteValue); 
            }
        } 
 
        /// 
        /// ApplyFontSize command event handler. 
        /// 
        private static void OnApplyFontSize(object target, ExecutedRoutedEventArgs args)
        {
            if (args.Parameter == null) 
            {
                return; // Ignore the command if no argument provided 
            } 
            TextEditor This = TextEditor._GetTextEditor(target);
            TextEditorCharacters._OnApplyProperty(This, TextElement.FontSizeProperty, args.Parameter); 
        }

        /// 
        /// ApplyFontFamily command event handler. 
        /// 
        private static void OnApplyFontFamily(object target, ExecutedRoutedEventArgs args) 
        { 
            if (args.Parameter == null)
            { 
                return; // Ignore the command if no argument provided
            }
            TextEditor This = TextEditor._GetTextEditor(target);
            TextEditorCharacters._OnApplyProperty(This, TextElement.FontFamilyProperty, args.Parameter); 
        }
 
        ///  
        /// ApplyForeground command event handler.
        ///  
        private static void OnApplyForeground(object target, ExecutedRoutedEventArgs args)
        {
            if (args.Parameter == null)
            { 
                return; // Ignore the command if no argument provided
            } 
            TextEditor This = TextEditor._GetTextEditor(target); 
            TextEditorCharacters._OnApplyProperty(This, TextElement.ForegroundProperty, args.Parameter);
        } 

        /// 
        /// ApplyBackground command event handler.
        ///  
        private static void OnApplyBackground(object target, ExecutedRoutedEventArgs args)
        { 
            if (args.Parameter == null) 
            {
                return; // Ignore the command if no argument provided 
            }
            TextEditor This = TextEditor._GetTextEditor(target);
            TextEditorCharacters._OnApplyProperty(This, TextElement.BackgroundProperty, args.Parameter);
        } 

        ///  
        /// ToggleSpellCheck command event handler. 
        /// 
        private static void OnToggleSpellCheck(object target, ExecutedRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(target);

            if (This == null || !This._IsEnabled || This.IsReadOnly) 
            {
                return; 
            } 

            This.IsSpellCheckEnabled = !This.IsSpellCheckEnabled; 
        }

        /// 
        /// ApplyInlineFlowDirectionRTL command event handler. 
        /// 
        private static void OnApplyInlineFlowDirectionRTL(object target, ExecutedRoutedEventArgs args) 
        { 
            TextEditor This = TextEditor._GetTextEditor(target);
            TextEditorCharacters._OnApplyProperty(This, Inline.FlowDirectionProperty, FlowDirection.RightToLeft); 
        }

        /// 
        /// ApplyInlineFlowDirectionLTR command event handler. 
        /// 
        private static void OnApplyInlineFlowDirectionLTR(object target, ExecutedRoutedEventArgs args) 
        { 
            TextEditor This = TextEditor._GetTextEditor(target);
            TextEditorCharacters._OnApplyProperty(This, Inline.FlowDirectionProperty, FlowDirection.LeftToRight); 
        }

        // ----------------------------------------------------------
        // 
        // Misceleneous Commands
        // 
        // ---------------------------------------------------------- 

        #region Misceleneous Commands 

        /// 
        /// StartInputCorrection command QueryStatus handler
        ///  
        private static void OnQueryStatusNYI(object target, CanExecuteRoutedEventArgs args)
        { 
            TextEditor This = TextEditor._GetTextEditor(target); 

            if (This == null) 
            {
                return;
            }
 
            args.CanExecute = true;
        } 
 
        #endregion Misceleneous Commands
 
        #endregion Private Methods
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//---------------------------------------------------------------------------- 
//
// File: TextEditorCharacters.cs
//
// Copyright (C) Microsoft Corporation.  All rights reserved. 
//
// Description: A component of TextEditor supporting character formatting commands 
// 
//---------------------------------------------------------------------------
 
namespace System.Windows.Documents
{
    using MS.Internal;
    using System.Globalization; 
    using System.Threading;
    using System.ComponentModel; 
    using System.Text; 
    using System.Collections; // ArrayList
    using System.Runtime.InteropServices; 

    using System.Windows.Threading;
    using System.Windows.Input;
    using System.Windows.Controls; // ScrollChangedEventArgs 
    using System.Windows.Controls.Primitives;  // CharacterCasing, TextBoxBase
    using System.Windows.Media; 
    using System.Windows.Markup; 

    using MS.Utility; 
    using MS.Win32;
    using MS.Internal.Documents;
    using MS.Internal.Commands; // CommandHelpers
 
    /// 
    /// Text editing service for controls. 
    ///  
    internal static class TextEditorCharacters
    { 
        //-----------------------------------------------------
        //
        //  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)
        {
            var onQueryStatusNYI = new CanExecuteRoutedEventHandler(OnQueryStatusNYI);
 
            // Editing Commands: Character Editing
            // ----------------------------------- 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ResetFormat                  , new ExecutedRoutedEventHandler(OnResetFormat)       , onQueryStatusNYI, SRID.KeyResetFormat, SRID.KeyResetFormatDisplayString); 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ToggleBold                   , new ExecutedRoutedEventHandler(OnToggleBold)        , onQueryStatusNYI, SRID.KeyToggleBold, SRID.KeyToggleBoldDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ToggleItalic                 , new ExecutedRoutedEventHandler(OnToggleItalic)      , onQueryStatusNYI, SRID.KeyToggleItalic, SRID.KeyToggleItalicDisplayString); 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ToggleUnderline              , new ExecutedRoutedEventHandler(OnToggleUnderline)   , onQueryStatusNYI, SRID.KeyToggleUnderline, SRID.KeyToggleUnderlineDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ToggleSubscript              , new ExecutedRoutedEventHandler(OnToggleSubscript)   , onQueryStatusNYI, SRID.KeyToggleSubscript, SRID.KeyToggleSubscriptDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ToggleSuperscript            , new ExecutedRoutedEventHandler(OnToggleSuperscript) , onQueryStatusNYI, SRID.KeyToggleSuperscript, SRID.KeyToggleSuperscriptDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.IncreaseFontSize             , new ExecutedRoutedEventHandler(OnIncreaseFontSize)  , onQueryStatusNYI, SRID.KeyIncreaseFontSize, SRID.KeyIncreaseFontSizeDisplayString); 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.DecreaseFontSize             , new ExecutedRoutedEventHandler(OnDecreaseFontSize)  , onQueryStatusNYI, SRID.KeyDecreaseFontSize, SRID.KeyDecreaseFontSizeDisplayString);
 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ApplyFontSize                , new ExecutedRoutedEventHandler(OnApplyFontSize)     , onQueryStatusNYI, SRID.KeyApplyFontSize, SRID.KeyApplyFontSizeDisplayString); 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ApplyFontFamily              , new ExecutedRoutedEventHandler(OnApplyFontFamily)   , onQueryStatusNYI, SRID.KeyApplyFontFamily, SRID.KeyApplyFontFamilyDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ApplyForeground              , new ExecutedRoutedEventHandler(OnApplyForeground)   , onQueryStatusNYI, SRID.KeyApplyForeground, SRID.KeyApplyForegroundDisplayString); 
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ApplyBackground              , new ExecutedRoutedEventHandler(OnApplyBackground)   , onQueryStatusNYI, SRID.KeyApplyBackground, SRID.KeyApplyBackgroundDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ToggleSpellCheck             , new ExecutedRoutedEventHandler(OnToggleSpellCheck)  , onQueryStatusNYI, SRID.KeyToggleSpellCheck, SRID.KeyToggleSpellCheckDisplayString);
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ApplyInlineFlowDirectionRTL  , new ExecutedRoutedEventHandler(OnApplyInlineFlowDirectionRTL), new CanExecuteRoutedEventHandler(OnQueryStatusNYI));
            CommandHelpers.RegisterCommandHandler(controlType, EditingCommands.ApplyInlineFlowDirectionLTR  , new ExecutedRoutedEventHandler(OnApplyInlineFlowDirectionLTR), new CanExecuteRoutedEventHandler(OnQueryStatusNYI)); 
        }
 
        // A common method for all formatting commands. 
        // Applies a property to current selection.
        // Takes care of toggling operations (like bold/italic). 
        // Creates undo unit for this action.
        internal static void _OnApplyProperty(TextEditor This, DependencyProperty formattingProperty, object propertyValue)
        {
            _OnApplyProperty(This, formattingProperty, propertyValue, /*applyToParagraphs*/false, PropertyValueAction.SetValue); 
        }
 
        internal static void _OnApplyProperty(TextEditor This, DependencyProperty formattingProperty, object propertyValue, bool applyToParagraphs) 
        {
            _OnApplyProperty(This, formattingProperty, propertyValue, applyToParagraphs, PropertyValueAction.SetValue); 
        }

        internal static void _OnApplyProperty(TextEditor This, DependencyProperty formattingProperty, object propertyValue, bool applyToParagraphs, PropertyValueAction propertyValueAction)
        { 
            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection))
            { 
                return; 
            }
 
            // Check whether the property is known
            if (!TextSchema.IsParagraphProperty(formattingProperty) && !TextSchema.IsCharacterProperty(formattingProperty))
            {
                Invariant.Assert(false, "The property '" + formattingProperty.Name + "' is unknown to TextEditor"); 
                return;
            } 
 
            TextSelection selection = (TextSelection)This.Selection;
 
            if (TextSchema.IsStructuralCharacterProperty(formattingProperty) &&
                !TextRangeEdit.CanApplyStructuralInlineProperty(selection.Start, selection.End))
            {
                // Ignore structural commands fires in inappropriate context. 
                return;
            } 
 
            TextEditorTyping._FlushPendingInputItems(This);
 
            // Forget previously suggested horizontal position
            TextEditorSelection._ClearSuggestedX(This);

            // Break merged typing sequence 
            TextEditorTyping._BreakTypingSequence(This);
 
            // Apply property 
            selection.ApplyPropertyValue(formattingProperty, propertyValue, applyToParagraphs, propertyValueAction);
        } 

        #endregion Class Internal Methods

        //------------------------------------------------------ 
        //
        //  Private Methods 
        // 
        //-----------------------------------------------------
 
        #region Private Methods

        // ................................................................
        // 
        // Editing Commands: Character Editing
        // 
        // ................................................................ 

        private static void OnResetFormat(object target, ExecutedRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(target);

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection.Start is TextPointer)) 
            {
                return; 
            } 

            TextEditorTyping._FlushPendingInputItems(This); 

            using (This.Selection.DeclareChangeBlock())
            {
                // Positions to clear all inline formatting properties 
                TextPointer startResetFormatPosition = (TextPointer)This.Selection.Start;
                TextPointer endResetFormatPosition = (TextPointer)This.Selection.End; 
 
                if (This.Selection.IsEmpty)
                { 
                    TextSegment autoWordRange = TextRangeBase.GetAutoWord(This.Selection);
                    if (autoWordRange.IsNull)
                    {
                        // Clear springloaded formatting 
                        ((TextSelection)This.Selection).ClearSpringloadFormatting();
                        return; 
                    } 
                    else
                    { 
                        // If we have a word, apply reset format to it
                        startResetFormatPosition = (TextPointer)autoWordRange.Start;
                        endResetFormatPosition = (TextPointer)autoWordRange.End;
                    } 
                }
 
                // Forget previously suggested horizontal position 
                TextEditorSelection._ClearSuggestedX(This);
 
                // Clear all inline formattings
                TextRangeEdit.CharacterResetFormatting(startResetFormatPosition, endResetFormatPosition);
            }
        } 

        ///  
        /// ToggleBold command event handler. 
        /// 
        private static void OnToggleBold(object target, ExecutedRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(target);

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection)) 
            {
                return; 
            } 

            TextEditorTyping._FlushPendingInputItems(This); 

            object propertyValue = ((TextSelection)This.Selection).GetCurrentValue(TextElement.FontWeightProperty);
            FontWeight fontWeight = (propertyValue != DependencyProperty.UnsetValue && (FontWeight)propertyValue == FontWeights.Bold) ? FontWeights.Normal : FontWeights.Bold;
 
            TextEditorCharacters._OnApplyProperty(This, TextElement.FontWeightProperty, fontWeight);
        } 
 
        /// 
        /// ToggleItalic command event handler. 
        /// 
        private static void OnToggleItalic(object target, ExecutedRoutedEventArgs args)
        {
            TextEditor This = TextEditor._GetTextEditor(target); 

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection)) 
            { 
                return;
            } 

            TextEditorTyping._FlushPendingInputItems(This);

            object propertyValue = ((TextSelection)This.Selection).GetCurrentValue(TextElement.FontStyleProperty); 
            FontStyle fontStyle = (propertyValue != DependencyProperty.UnsetValue && (FontStyle)propertyValue == FontStyles.Italic) ? FontStyles.Normal : FontStyles.Italic;
 
            TextEditorCharacters._OnApplyProperty(This, TextElement.FontStyleProperty, fontStyle); 

            // Update the caret to show it as italic or normal caret. 
            This.Selection.RefreshCaret();
        }

        ///  
        /// ToggleUnderline command event handler.
        ///  
        private static void OnToggleUnderline(object target, ExecutedRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(target); 

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection))
            {
                return; 
            }
 
            TextEditorTyping._FlushPendingInputItems(This); 

            object propertyValue = ((TextSelection)This.Selection).GetCurrentValue(Inline.TextDecorationsProperty); 
            TextDecorationCollection textDecorations = propertyValue != DependencyProperty.UnsetValue ? (TextDecorationCollection)propertyValue : null;

            if (!TextSchema.HasTextDecorations(textDecorations))
            { 
                textDecorations = TextDecorations.Underline;
            } 
            else 
            {
                textDecorations = new TextDecorationCollection(); // empty collection - no underline 
            }

            TextEditorCharacters._OnApplyProperty(This, Inline.TextDecorationsProperty, textDecorations);
        } 

        // Command handler for Ctrl+"+" key (non-numpad) 
        private static void OnToggleSubscript(object sender, ExecutedRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(sender); 

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection))
            {
                return; 
            }
 
            TextEditorTyping._FlushPendingInputItems(This); 

            FontVariants fontVariants = (FontVariants)((TextSelection)This.Selection).GetCurrentValue(Typography.VariantsProperty); 

            fontVariants = fontVariants == FontVariants.Subscript ? FontVariants.Normal : FontVariants.Subscript;

            TextEditorCharacters._OnApplyProperty(This, Typography.VariantsProperty, fontVariants); 
        }
 
        // Command handler fro Ctrl+Shift+"+" (non-numpad) 
        private static void OnToggleSuperscript(object sender, ExecutedRoutedEventArgs args)
        { 
            TextEditor This = TextEditor._GetTextEditor(sender);

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection))
            { 
                return;
            } 
 
            TextEditorTyping._FlushPendingInputItems(This);
 
            FontVariants fontVariants = (FontVariants)((TextSelection)This.Selection).GetCurrentValue(Typography.VariantsProperty);

            fontVariants = fontVariants == FontVariants.Superscript ? FontVariants.Normal : FontVariants.Superscript;
 
            TextEditorCharacters._OnApplyProperty(This, Typography.VariantsProperty, fontVariants);
        } 
 
        // Used in IncreaseFontSize and DecreaseFontSize commands
        internal const double OneFontPoint = 72.0 / 96.0; 

        // The limiting constant is taken from Word UI - it suggests to choose font size from a range between 1 and 1638.
        //
        internal const double MaxFontPoint = 1638.0; 

        ///  
        /// IncreaseFontSize command event handler 
        /// 
        private static void OnIncreaseFontSize(object target, ExecutedRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(target);

            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection)) 
            {
                return; 
            } 

            TextEditorTyping._FlushPendingInputItems(This); 

            if (This.Selection.IsEmpty)
            {
                // Springload an increased font size 
                double fontSize = (double)((TextSelection)This.Selection).GetCurrentValue(TextElement.FontSizeProperty);
                if (fontSize == 0.0) 
                { 
                    return; // no characters available for font operation
                } 

                if (fontSize < TextEditorCharacters.MaxFontPoint)
                {
                    fontSize += TextEditorCharacters.OneFontPoint; 
                    if (fontSize > TextEditorCharacters.MaxFontPoint)
                    { 
                        fontSize = TextEditorCharacters.MaxFontPoint; 
                    }
 
                    // The limiting constant is taken from Word UI - it suggests to choose font size from a range between 1 and 1638.
                    TextEditorCharacters._OnApplyProperty(This, TextElement.FontSizeProperty, fontSize);
                }
            } 
            else
            { 
                // Apply font size in incremental mode to a nonempty selection 
                TextEditorCharacters._OnApplyProperty(This, TextElement.FontSizeProperty, OneFontPoint, /*applyToParagraphs:*/false, PropertyValueAction.IncreaseByAbsoluteValue);
            } 
        }

        /// 
        /// DecreaseFontSize command event handler 
        /// 
        private static void OnDecreaseFontSize(object target, ExecutedRoutedEventArgs args) 
        { 
            TextEditor This = TextEditor._GetTextEditor(target);
 
            if (This == null || !This._IsEnabled || This.IsReadOnly || !This.AcceptsRichContent || !(This.Selection is TextSelection))
            {
                return;
            } 

            TextEditorTyping._FlushPendingInputItems(This); 
 
            if (This.Selection.IsEmpty)
            { 
                // Springload a decreased font size
                double fontSize = (double)((TextSelection)This.Selection).GetCurrentValue(TextElement.FontSizeProperty);
                if (fontSize == 0.0)
                { 
                    return; // no characters available for font operation
                } 
 
                if (fontSize > TextEditorCharacters.OneFontPoint)
                { 
                    fontSize -= TextEditorCharacters.OneFontPoint;
                    if (fontSize < TextEditorCharacters.OneFontPoint)
                    {
                        fontSize = TextEditorCharacters.OneFontPoint; 
                    }
 
                    TextEditorCharacters._OnApplyProperty(This, TextElement.FontSizeProperty, fontSize); 
                }
            } 
            else
            {
                // Apply font size in decremental mode to a nonempty selection
                TextEditorCharacters._OnApplyProperty(This, TextElement.FontSizeProperty, OneFontPoint, /*applyToParagraphs:*/false, PropertyValueAction.DecreaseByAbsoluteValue); 
            }
        } 
 
        /// 
        /// ApplyFontSize command event handler. 
        /// 
        private static void OnApplyFontSize(object target, ExecutedRoutedEventArgs args)
        {
            if (args.Parameter == null) 
            {
                return; // Ignore the command if no argument provided 
            } 
            TextEditor This = TextEditor._GetTextEditor(target);
            TextEditorCharacters._OnApplyProperty(This, TextElement.FontSizeProperty, args.Parameter); 
        }

        /// 
        /// ApplyFontFamily command event handler. 
        /// 
        private static void OnApplyFontFamily(object target, ExecutedRoutedEventArgs args) 
        { 
            if (args.Parameter == null)
            { 
                return; // Ignore the command if no argument provided
            }
            TextEditor This = TextEditor._GetTextEditor(target);
            TextEditorCharacters._OnApplyProperty(This, TextElement.FontFamilyProperty, args.Parameter); 
        }
 
        ///  
        /// ApplyForeground command event handler.
        ///  
        private static void OnApplyForeground(object target, ExecutedRoutedEventArgs args)
        {
            if (args.Parameter == null)
            { 
                return; // Ignore the command if no argument provided
            } 
            TextEditor This = TextEditor._GetTextEditor(target); 
            TextEditorCharacters._OnApplyProperty(This, TextElement.ForegroundProperty, args.Parameter);
        } 

        /// 
        /// ApplyBackground command event handler.
        ///  
        private static void OnApplyBackground(object target, ExecutedRoutedEventArgs args)
        { 
            if (args.Parameter == null) 
            {
                return; // Ignore the command if no argument provided 
            }
            TextEditor This = TextEditor._GetTextEditor(target);
            TextEditorCharacters._OnApplyProperty(This, TextElement.BackgroundProperty, args.Parameter);
        } 

        ///  
        /// ToggleSpellCheck command event handler. 
        /// 
        private static void OnToggleSpellCheck(object target, ExecutedRoutedEventArgs args) 
        {
            TextEditor This = TextEditor._GetTextEditor(target);

            if (This == null || !This._IsEnabled || This.IsReadOnly) 
            {
                return; 
            } 

            This.IsSpellCheckEnabled = !This.IsSpellCheckEnabled; 
        }

        /// 
        /// ApplyInlineFlowDirectionRTL command event handler. 
        /// 
        private static void OnApplyInlineFlowDirectionRTL(object target, ExecutedRoutedEventArgs args) 
        { 
            TextEditor This = TextEditor._GetTextEditor(target);
            TextEditorCharacters._OnApplyProperty(This, Inline.FlowDirectionProperty, FlowDirection.RightToLeft); 
        }

        /// 
        /// ApplyInlineFlowDirectionLTR command event handler. 
        /// 
        private static void OnApplyInlineFlowDirectionLTR(object target, ExecutedRoutedEventArgs args) 
        { 
            TextEditor This = TextEditor._GetTextEditor(target);
            TextEditorCharacters._OnApplyProperty(This, Inline.FlowDirectionProperty, FlowDirection.LeftToRight); 
        }

        // ----------------------------------------------------------
        // 
        // Misceleneous Commands
        // 
        // ---------------------------------------------------------- 

        #region Misceleneous Commands 

        /// 
        /// StartInputCorrection command QueryStatus handler
        ///  
        private static void OnQueryStatusNYI(object target, CanExecuteRoutedEventArgs args)
        { 
            TextEditor This = TextEditor._GetTextEditor(target); 

            if (This == null) 
            {
                return;
            }
 
            args.CanExecute = true;
        } 
 
        #endregion Misceleneous Commands
 
        #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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