Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / IO / Packaging / xmlglyphRunInfo.cs / 1305600 / xmlglyphRunInfo.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // Implements a DOM-based subclass of the FixedPageInfo abstract class. // The class functions as an array of XmlGlyphRunInfo's in markup order. // // History: // 05/06/2004: JohnLarc: Initial implementation // 10/31/2005: JohnLarc: Removed GDI-aware implementations. To restore them, run // 'sd labelsync -l XmlGlyphRunInfo'. //--------------------------------------------------------------------------- using System; using System.Xml; // For DOM objects using System.Diagnostics; // For Assert using System.Globalization; // For CultureInfo using System.Windows; // For ExceptionStringTable using Windows = System.Windows; // For Windows.Point (as distinct from System.Drawing.Point) using System.Windows.Markup; // For XmlLanguage namespace MS.Internal.IO.Packaging { ////// DOM-based implementation of the abstract class GlyphRunInfo. /// internal class XmlGlyphRunInfo : MS.Internal.GlyphRunInfo { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors ////// Initialize from a DOM object. /// internal XmlGlyphRunInfo(XmlNode glyphsNode) { _glyphsNode = glyphsNode as XmlElement; // Assert that XmlFixedPageInfo (only caller) has correctly identified glyph runs // prior to invoking this constructor. Debug.Assert(_glyphsNode != null && String.CompareOrdinal(_glyphsNode.LocalName, _glyphRunName) == 0 && String.CompareOrdinal(_glyphsNode.NamespaceURI, ElementTableKey.FixedMarkupNamespace) == 0); } #endregion Constructors //------------------------------------------------------ // // Internal Properties // //----------------------------------------------------- #region Internal Properties ////// The start point of the segment [StartPosition, EndPosition], /// which runs along the baseline of the glyph run. /// ////// The point is given in page coordinates. /// double.NaN can be returned in either coordinate when the input glyph run is invalid. /// internal override Windows.Point StartPosition { get { throw new NotSupportedException(SR.Get(SRID.XmlGlyphRunInfoIsNonGraphic)); } } ////// The end point of the segment [StartPosition, EndPosition], /// which runs along the baseline of the glyph run. /// ////// The point is given in page coordinates. /// double.NaN can be returned in either coordinate when the input glyph run is invalid. /// internal override Windows.Point EndPosition { get { throw new NotSupportedException(SR.Get(SRID.XmlGlyphRunInfoIsNonGraphic)); } } ////// The font width in ems. /// ////// This is provided for the purpose of evaluating distances along the baseline OR a perpendicular /// to the baseline. /// When a font is displayed sideways, what is given here is still the width of the font. /// It is up to the client code to decide whether to use the width or height for measuring /// distances between glyph runs. /// /// NaN can be returned if the markup is invalid. /// internal override double WidthEmFontSize { get { throw new NotSupportedException(SR.Get(SRID.XmlGlyphRunInfoIsNonGraphic)); } } ////// The font height in ems. /// ////// This is provided for the purpose of evaluating distances along the baseline OR a perpendicular /// to the baseline. /// When a font is displayed sideways, what is given here is still the height of the font. /// It is up to the client code to decide whether to use the width or height for measuring /// deviations from the current baseline. /// /// NaN can be returned if the markup is invalid. /// internal override double HeightEmFontSize { get { throw new NotSupportedException(SR.Get(SRID.XmlGlyphRunInfoIsNonGraphic)); } } ////// Whether glyphs are individually rotated 90 degrees (so as to face downwards in vertical text layout). /// ////// This feature is designed for ideograms and should not make sense for latin characters. /// internal override bool GlyphsHaveSidewaysOrientation { get { throw new NotSupportedException(SR.Get(SRID.XmlGlyphRunInfoIsNonGraphic)); } } ////// 0 for left-to-right and 1 for right-to-left. /// ////// 0 is assumed if the attribute value is absent or unexpected. /// internal override int BidiLevel { get { throw new NotSupportedException(SR.Get(SRID.XmlGlyphRunInfoIsNonGraphic)); } } ////// The glyph run's language id. /// ////// The language ID is typed as unsigned for easier interop marshalling, since the win32 LCID type (as defined in WinNT.h) is a DWORD. /// internal override uint LanguageID { get { if (_languageID == null) { for (XmlElement currentNode = _glyphsNode; currentNode != null && _languageID == null; currentNode = (currentNode.ParentNode as XmlElement)) { string languageString = currentNode.GetAttribute(_xmlLangAttribute); if (languageString != null && languageString.Length > 0) { // We need to handle languageString "und" specially. // we should set language ID to zero. // That's what the Indexing Search team told us to do. // There's no CultureInfo for "und". // CultureInfo("und") will cause an error. if (string.CompareOrdinal(languageString.ToUpperInvariant(), _undeterminedLanguageStringUpper) == 0) { _languageID = 0; } else { // Here we use XmlLanguage class to help us get the most // compatible culture from the languageString. // // In the case that languageString and its variants do not match // any known language string in the table, we will get InvariantCulture // from GetCompatibleCulture(). // // In the case that languageString is invalid (e.g. non-ascii string), // the GetLanguage() method will throw an exception and we will give // up filtering this part. XmlLanguage lang = XmlLanguage.GetLanguage(languageString); CultureInfo cultureInfo = lang.GetCompatibleCulture(); _languageID = checked((uint)cultureInfo.LCID); } } } // If we cannot set the language ID in the previous logic, that means the // language string is missing and we should default the culture to be // InvariantCulture. // Note: XamlFilter.GetCurrentLcid is a private method that also has // similar logic and will default to CultureInfo.InvariantCulture.LCID // CultureInfo.InvariantCulture will never be null if(_languageID == null) _languageID = checked((uint)CultureInfo.InvariantCulture.LCID); } // Cast Nullable<> into value type. return (uint) _languageID; } } ////// The glyph run's contents as a string of unicode symbols. /// If the unicode attribute is missing in the markup then an empty string is returned. /// internal override string UnicodeString { get { if (_unicodeString == null) { _unicodeString = _glyphsNode.GetAttribute(_unicodeStringAttribute); } return _unicodeString; } } #endregion Internal Properties //------------------------------------------------------ // // Private Fields // //------------------------------------------------------ #region Private Fields #region Constants private const string _glyphRunName = "Glyphs"; private const string _xmlLangAttribute = "xml:lang"; private const string _unicodeStringAttribute = "UnicodeString"; // The undetermined language string can be "und" or "UND". We always convert strings // to uppercase for case-insensitive comparison, so we store an uppercase version here. private const string _undeterminedLanguageStringUpper = "UND"; private XmlElement _glyphsNode = null; private string _unicodeString = null; private Nullable_languageID = null; #endregion Private Fields } #endregion NativeMethods } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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