Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / FontFamilyConverter.cs / 1 / FontFamilyConverter.cs
//+------------------------------------------------------------------------ // // Microsoft Windows Client Platform // Copyright (C) Microsoft Corporation, 2002 // // File: FontFamilyConverter.cs // // Contents: FontFamilyConverter implementation // // Spec: [....]/sites/Avalon/Specs/Fonts.htm // // Created: 2-1-2005 [....] ([....]) // //----------------------------------------------------------------------- using System; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Diagnostics; using System.Globalization; using System.Windows.Navigation; using System.Windows.Markup; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; // Allow suppression of presharp warnings #pragma warning disable 1634, 1691 namespace System.Windows.Media { ////// FontFamilyConverter - converter class for converting between the FontFamily /// and String types. /// public class FontFamilyConverter : TypeConverter { ////// CanConvertFrom - Returns whether or not the given type can be converted to a /// FontFamily. /// public override bool CanConvertFrom(ITypeDescriptorContext td, Type t) { return t == typeof(string); } ////// CanConvertTo - Returns whether or not this class can convert to the specified type. /// Conversion is possible only if the source and destination types are FontFamily and /// string, respectively, and the font family is not anonymous (i.e., the Source propery /// is not null). /// /// ITypeDescriptorContext /// Type to convert to ///true if conversion is possible public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(string)) { if (context != null) { // When serializing to XAML we want to write the FontFamily as an attribute if and // only if it's a named font family. FontFamily fontFamily = context.Instance as FontFamily; // Suppress PRESharp warning that fontFamily can be null; apparently PRESharp // doesn't understand short circuit evaluation of operator &&. #pragma warning suppress 56506 return fontFamily != null && fontFamily.Source != null && fontFamily.Source.Length != 0; } else { // Some clients call typeConverter.CanConvertTo(typeof(string)), in which case we // don't have the FontFamily instance to convert. Most font families are named, and // we can always give some kind of name, so return true. return true; } } else if (destinationType == typeof(FontFamily)) { return true; } return base.CanConvertTo(context, destinationType); } ////// ConvertFrom - Converts the specified object to a FontFamily. /// public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo cultureInfo, object o) { if ((o != null) && (o.GetType() == typeof(string))) { string s = o as string; if (s == null || s.Length == 0) { throw GetConvertFromException(s); } // Logic below is similar to TypeConverterHelper.GetUriFromUriContext, // except that we cannot treat font family string as a Uri, // and that we handle cases when context is null. Uri baseUri = null; if (context != null) { IUriContext iuc = (IUriContext)context.GetService(typeof(IUriContext)); if (iuc != null) { if (iuc.BaseUri != null) { baseUri = iuc.BaseUri; if (!baseUri.IsAbsoluteUri) { baseUri = new Uri(BaseUriHelper.BaseUri, baseUri); } } else { // If we reach here, the base uri we got from IUriContext is "". // Here we resolve it to application's base baseUri = BaseUriHelper.BaseUri; } } } return new FontFamily(baseUri, s); } return base.ConvertFrom(context, cultureInfo, o); ; } ////// ConvertTo - Converts the specified object to an instance of the specified type. /// public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (null == value) { throw new ArgumentNullException("value"); } FontFamily fontFamily = value as FontFamily; if (fontFamily == null) { throw new ArgumentException(SR.Get(SRID.General_Expected_Type, "FontFamily"), "value"); } if (null == destinationType) { throw new ArgumentNullException("destinationType"); } if (destinationType == typeof(string)) { if (fontFamily.Source != null) { // Usual case: it's a named font family. return fontFamily.Source; } else { // If client calls typeConverter.CanConvertTo(typeof(string)) then we'll return // true always, even though we don't have access to the FontFamily instance; so // we need to be able to return some kind of family name even if Source==null. string name = null; CultureInfo parentCulture = null; if (culture != null) { if (culture.Equals(CultureInfo.InvariantCulture)) { culture = null; } else { parentCulture = culture.Parent; if (parentCulture != null && (parentCulture.Equals(CultureInfo.InvariantCulture) || parentCulture == culture)) { parentCulture = null; } } } // Try looking up the name in the FamilyNames dictionary. LanguageSpecificStringDictionary names = fontFamily.FamilyNames; if (culture != null && names.TryGetValue(XmlLanguage.GetLanguage(culture.IetfLanguageTag), out name)) { // LanguageSpecificStringDictionary does not allow null string to be added. Debug.Assert(name != null); } else if (parentCulture != null && names.TryGetValue(XmlLanguage.GetLanguage(parentCulture.IetfLanguageTag), out name)) { // LanguageSpecificStringDictionary does not allow null string to be added. Debug.Assert(name != null); } else if (names.TryGetValue(XmlLanguage.Empty, out name)) { // LanguageSpecificStringDictionary does not allow null string to be added. Debug.Assert(name != null); } else { // Try the first target font compatible with the culture. foreach (FontFamilyMap familyMap in fontFamily.FamilyMaps) { if (FontFamilyMap.MatchCulture(familyMap.Language, culture)) { name = familyMap.Target; break; } } // Use global ui as a last resort. if (name == null) name = FontFamily.GlobalUI; } return name; } } return base.ConvertTo(context, culture, value, destinationType); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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