Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / FontFamilyConverter.cs / 1305600 / FontFamilyConverter.cs
//+------------------------------------------------------------------------ // // Microsoft Windows Client Platform // Copyright (C) Microsoft Corporation, 2002 // // File: FontFamilyConverter.cs // // Contents: FontFamilyConverter implementation // // Spec: http://team/sites/Avalon/Specs/Fonts.htm // // Created: 2-1-2005 Niklas Borson (niklasb) // //----------------------------------------------------------------------- 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.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DocumentOrderComparer.cs
- BuildProvider.cs
- MenuItemCollection.cs
- HtmlInputRadioButton.cs
- BufferedStream2.cs
- WebPartConnection.cs
- BinaryParser.cs
- DataProtectionSecurityStateEncoder.cs
- MouseEventArgs.cs
- PlainXmlSerializer.cs
- CalendarDay.cs
- Lease.cs
- KeyedHashAlgorithm.cs
- TextParagraphView.cs
- UIElement.cs
- Activity.cs
- EndGetFileNameFromUserRequest.cs
- PropertiesTab.cs
- GenerateTemporaryTargetAssembly.cs
- OdbcTransaction.cs
- ToolboxCategoryItems.cs
- Int32Converter.cs
- XNodeValidator.cs
- SqlMultiplexer.cs
- SecurityTokenReferenceStyle.cs
- LineMetrics.cs
- ListChunk.cs
- SessionMode.cs
- ListChunk.cs
- ElementUtil.cs
- MinMaxParagraphWidth.cs
- XsltSettings.cs
- SqlStream.cs
- UrlMappingsSection.cs
- SymmetricKeyWrap.cs
- CleanUpVirtualizedItemEventArgs.cs
- PageFunction.cs
- DBAsyncResult.cs
- ReplacementText.cs
- MsmqInputChannelListener.cs
- PeerCollaborationPermission.cs
- UniformGrid.cs
- RowToFieldTransformer.cs
- MimePart.cs
- ExtenderProvidedPropertyAttribute.cs
- DataException.cs
- MaterializeFromAtom.cs
- RoleManagerEventArgs.cs
- DataGridViewAccessibleObject.cs
- UnauthorizedAccessException.cs
- BitmapMetadata.cs
- DataGridLinkButton.cs
- CrossContextChannel.cs
- UInt64Converter.cs
- NavigationProperty.cs
- EventlogProvider.cs
- Operand.cs
- XmlEncoding.cs
- LinkedResourceCollection.cs
- User.cs
- LocalizationComments.cs
- RenderOptions.cs
- FileDialogPermission.cs
- ChangeBlockUndoRecord.cs
- LineServices.cs
- DateTimeOffsetAdapter.cs
- SchemaAttDef.cs
- LogConverter.cs
- MatrixCamera.cs
- XmlILTrace.cs
- SecurityContextSecurityTokenParameters.cs
- WsdlHelpGeneratorElement.cs
- DescendentsWalker.cs
- Metadata.cs
- HyperLinkDataBindingHandler.cs
- MethodToken.cs
- FileUtil.cs
- NetMsmqSecurityElement.cs
- MulticastNotSupportedException.cs
- CompModSwitches.cs
- SpanIndex.cs
- SQLSingleStorage.cs
- RelatedPropertyManager.cs
- EventEntry.cs
- MarshalByRefObject.cs
- RemoteWebConfigurationHostStream.cs
- XsdSchemaFileEditor.cs
- XmlNavigatorStack.cs
- UseLicense.cs
- ZeroOpNode.cs
- RelationshipEndMember.cs
- FakeModelItemImpl.cs
- ObjectStateFormatter.cs
- TdsParserStaticMethods.cs
- BooleanAnimationUsingKeyFrames.cs
- MarshalDirectiveException.cs
- CategoryValueConverter.cs
- SafeMemoryMappedFileHandle.cs
- sqlnorm.cs
- HMAC.cs