TextProperties.cs source code in C# .NET

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                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / Text / TextProperties.cs / 1 / TextProperties.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: TextProperties.cs 
//
// Description: Text run properties provider. 
// 
// History:
//  04/25/2003 : [....] - moving from Avalon branch. 
//
//---------------------------------------------------------------------------

using System; 
using System.Diagnostics;
using System.Globalization; 
using System.Windows; 
using System.Windows.Controls;
using System.Windows.Documents; 
using System.Windows.Media;
using System.Windows.Media.TextFormatting;

namespace MS.Internal.Text 
{
    // --------------------------------------------------------------------- 
    // Text run properties provider. 
    // ---------------------------------------------------------------------
    internal sealed class TextProperties : TextRunProperties 
    {
        // ------------------------------------------------------------------
        //
        //  TextRunProperties Implementation 
        //
        // ----------------------------------------------------------------- 
 
        #region TextRunProperties Implementation
 
        // ------------------------------------------------------------------
        // Typeface used to format and display text.
        // ------------------------------------------------------------------
        public override Typeface Typeface { get { return _typeface; }  } 

        // ----------------------------------------------------------------- 
        // Em size of font used to format and display text. 
        // ------------------------------------------------------------------
        public override double FontRenderingEmSize 
        {
            get
            {
                double emSize = _fontSize; 
                // Make sure that TextFormatter limitations are not exceeded.
                TextDpi.EnsureValidLineOffset(ref emSize); 
                return emSize; 
            }
        } 

        // -----------------------------------------------------------------
        // Em size of font to determine subtle change in font hinting.
        // ----------------------------------------------------------------- 
        public override double FontHintingEmSize { get { return 12.0; } }
 
        // ----------------------------------------------------------------- 
        // Text decorations.
        // ------------------------------------------------------------------ 
        public override TextDecorationCollection TextDecorations { get { return _textDecorations; } }

        // -----------------------------------------------------------------
        // Text foreground bursh. 
        // ------------------------------------------------------------------
        public override Brush ForegroundBrush { get { return _foreground; } } 
 
        // ------------------------------------------------------------------
        // Text background brush. 
        // -----------------------------------------------------------------
        public override Brush BackgroundBrush { get { return _backgroundBrush; } }

        // ------------------------------------------------------------------ 
        // Text vertical alignment.
        // ----------------------------------------------------------------- 
        public override BaselineAlignment BaselineAlignment { get { return _baselineAlignment; } } 

        // ----------------------------------------------------------------- 
        // Text culture info.
        // -----------------------------------------------------------------
        public override CultureInfo CultureInfo { get { return _cultureInfo; } }
 
        // ------------------------------------------------------------------
        // Number substitution 
        // ----------------------------------------------------------------- 
        public override NumberSubstitution NumberSubstitution { get { return _numberSubstitution; } }
 
        // ------------------------------------------------------------------
        // Typography properties
        // ------------------------------------------------------------------
        public override TextRunTypographyProperties TypographyProperties{ get { return _typographyProperties; } } 

        // ----------------------------------------------------------------- 
        // TextEffects property 
        // ------------------------------------------------------------------
        public override TextEffectCollection TextEffects { get { return _textEffects; } } 

        #endregion TextRunProperties Implementation

        // ----------------------------------------------------------------- 
        // Constructor.
        // ----------------------------------------------------------------- 
        internal TextProperties(FrameworkElement target, bool isTypographyDefaultValue) 
        {
            // if none of the number substitution properties have changed, initialize the 
            // _numberSubstitution field to a known default value
            if (!target.HasNumberSubstitutionChanged)
            {
                _numberSubstitution = FrameworkElement.DefaultNumberSubstitution; 
            }
 
            InitCommon(target); 
            if (!isTypographyDefaultValue)
            { 
                _typographyProperties = TextElement.GetTypographyProperties(target);
            }
            else
            { 
                _typographyProperties = Typography.Default;
            } 
 
            _baselineAlignment = BaselineAlignment.Baseline;
        } 

        internal TextProperties(DependencyObject target, StaticTextPointer position, bool inlineObjects, bool getBackground)
        {
            // if none of the number substitution properties have changed, we may be able to 
            // initialize the _numberSubstitution field to a known default value
            FrameworkContentElement fce = target as FrameworkContentElement; 
            if (fce != null) 
            {
                if (!fce.HasNumberSubstitutionChanged) 
                {
                    _numberSubstitution = FrameworkContentElement.DefaultNumberSubstitution;
                }
            } 
            else
            { 
                FrameworkElement fe = target as FrameworkElement; 
                if (fe != null && !fe.HasNumberSubstitutionChanged)
                { 
                    _numberSubstitution = FrameworkElement.DefaultNumberSubstitution;
                }
            }
 
            InitCommon(target);
 
            _typographyProperties = GetTypographyProperties(target); 
            if (!inlineObjects)
            { 
                _baselineAlignment = DynamicPropertyReader.GetBaselineAlignment(target);

                if (!position.IsNull)
                { 
                    TextDecorationCollection highlightDecorations = GetHighlightTextDecorations(position);
                    if (highlightDecorations != null) 
                    { 
                        // Highlights (if present) take precedence over property value TextDecorations.
                        _textDecorations = highlightDecorations; 
                    }
                }

                if (getBackground) 
                {
                    _backgroundBrush = DynamicPropertyReader.GetBackgroundBrush(target); 
                } 
            }
            else 
            {
                _baselineAlignment = DynamicPropertyReader.GetBaselineAlignmentForInlineObject(target);
                _textDecorations = DynamicPropertyReader.GetTextDecorationsForInlineObject(target, _textDecorations);
 
                if (getBackground)
                { 
                    _backgroundBrush = DynamicPropertyReader.GetBackgroundBrushForInlineObject(position); 
                }
            } 
        }

        // Copy constructor, with override for default TextDecorationCollection value.
        internal TextProperties(TextProperties source, TextDecorationCollection textDecorations) 
        {
            _backgroundBrush = source._backgroundBrush; 
            _typeface = source._typeface; 
            _fontSize = source._fontSize;
            _foreground = source._foreground; 
            _textEffects = source._textEffects;
            _cultureInfo = source._cultureInfo;
            _numberSubstitution = source._numberSubstitution;
            _typographyProperties = source._typographyProperties; 
            _baselineAlignment = source._baselineAlignment;
 
            _textDecorations = textDecorations; 
        }
 
        // assigns values to all fields except for _typographyProperties, _baselineAlignment,
        // and _background, which are set appropriately in each constructor
        private void InitCommon(DependencyObject target)
        { 
            _typeface = DynamicPropertyReader.GetTypeface(target);
 
            _fontSize = (double)target.GetValue(TextElement.FontSizeProperty); 
            _foreground = (Brush) target.GetValue(TextElement.ForegroundProperty);
            _textEffects = DynamicPropertyReader.GetTextEffects(target); 

            _cultureInfo = DynamicPropertyReader.GetCultureInfo(target);
            _textDecorations = DynamicPropertyReader.GetTextDecorations(target);
 
            // as an optimization, we may have already initialized _numberSubstitution to a default
            // value if none of the NumberSubstitution dependency properties have changed 
            if (_numberSubstitution == null) 
            {
                _numberSubstitution = DynamicPropertyReader.GetNumberSubstitution(target); 
            }
        }

        // Gathers text decorations set on scoping highlights. 
        // If no highlight properties are found, returns null
        private static TextDecorationCollection GetHighlightTextDecorations(StaticTextPointer highlightPosition) 
        { 
            TextDecorationCollection textDecorations = null;
            Highlights highlights = highlightPosition.TextContainer.Highlights; 

            if (highlights == null)
            {
                return textDecorations; 
            }
 
            // 
            // Speller
            // 
            textDecorations = highlights.GetHighlightValue(highlightPosition, LogicalDirection.Forward, typeof(SpellerHighlightLayer)) as TextDecorationCollection;

            //
            // IME composition 
            //
            // 
 

 
#if UNUSED_IME_HIGHLIGHT_LAYER
            TextDecorationCollection imeTextDecorations = highlights.GetHighlightValue(highlightPosition, LogicalDirection.Forward, typeof(FrameworkTextComposition)) as TextDecorationCollection;
            if (imeTextDecorations != null)
            { 
                textDecorations = imeTextDecorations;
            } 
#endif 

            return textDecorations; 
        }

        // -----------------------------------------------------------------
        // Retrieve typography properties from specified element. 
        // ------------------------------------------------------------------
        private static TypographyProperties GetTypographyProperties(DependencyObject element) 
        { 
            Debug.Assert(element != null);
 
            TextBlock tb = element as TextBlock;
            if (tb != null)
            {
                if(!tb.IsTypographyDefaultValue) 
                {
                    return TextElement.GetTypographyProperties(element); 
                } 
                else
                { 
                    return Typography.Default;
                }
            }
 
            TextBox textBox = element as TextBox;
            if (textBox != null) 
            { 
                if (!textBox.IsTypographyDefaultValue)
                { 
                    return TextElement.GetTypographyProperties(element);
                }
                else
                { 
                    return Typography.Default;
                } 
            } 

            TextElement te = element as TextElement; 
            if (te != null)
            {
                return te.TypographyPropertiesGroup;
            } 

            FlowDocument fd = element as FlowDocument; 
            if (fd != null) 
            {
               return fd.TypographyPropertiesGroup; 
            }

            // return default typography properties group
            return Typography.Default; 
        }
 
 

        // ----------------------------------------------------------------- 
        // Typeface.
        // ------------------------------------------------------------------
        private Typeface _typeface;
 
        // ------------------------------------------------------------------
        // Font size. 
        // ----------------------------------------------------------------- 
        private double _fontSize;
 
        // ------------------------------------------------------------------
        // Foreground brush.
        // -----------------------------------------------------------------
        private Brush _foreground; 

        // ----------------------------------------------------------------- 
        // Text effects flags. 
        // -----------------------------------------------------------------
        private TextEffectCollection _textEffects; 

        // ------------------------------------------------------------------
        // Text decorations.
        // ----------------------------------------------------------------- 
        private TextDecorationCollection _textDecorations;
 
        // ------------------------------------------------------------------ 
        // Baseline alignment.
        // ------------------------------------------------------------------ 
        private BaselineAlignment _baselineAlignment;

        // -----------------------------------------------------------------
        // Text background brush. 
        // ------------------------------------------------------------------
        private Brush _backgroundBrush; 
 
        // -----------------------------------------------------------------
        // Culture info. 
        // -----------------------------------------------------------------
        private CultureInfo _cultureInfo;

        // ----------------------------------------------------------------- 
        // Number Substitution
        // ------------------------------------------------------------------ 
        private NumberSubstitution _numberSubstitution; 

        // ----------------------------------------------------------------- 
        // Typography properties group.
        // ------------------------------------------------------------------
        private TextRunTypographyProperties _typographyProperties;
    } 
}

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

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