Code:
/ 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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