Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / FontStretchConverter.cs / 1 / FontStretchConverter.cs
//---------------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // Description: FontStretch type converter. // // History: // 01/25/2005 [....] - Created. // //--------------------------------------------------------------------------- using System; using System.IO; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Reflection; using MS.Internal; using System.Windows.Media; using System.Text; using System.Collections; using System.Globalization; using System.Runtime.InteropServices; using System.Security; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; namespace System.Windows { ////// FontStretchConverter class parses a font stretch string. /// public sealed class FontStretchConverter : TypeConverter { ////// CanConvertFrom /// public override bool CanConvertFrom(ITypeDescriptorContext td, Type t) { if (t == typeof(string)) { return true; } else { return false; } } ////// TypeConverter method override. /// /// ITypeDescriptorContext /// Type to convert to ///true if conversion is possible public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(InstanceDescriptor) || destinationType == typeof(string)) { return true; } return base.CanConvertTo(context, destinationType); } ////// ConvertFrom - attempt to convert to a FontStretch from the given object /// ////// A NotSupportedException is thrown if the example object is null or is not a valid type /// which can be converted to a FontStretch. /// public override object ConvertFrom(ITypeDescriptorContext td, CultureInfo ci, object value) { if (null == value) { throw GetConvertFromException(value); } String s = value as string; if (null == s) { throw new ArgumentException(SR.Get(SRID.General_BadType, "ConvertFrom"), "value"); } FontStretch fontStretch = new FontStretch(); if (!FontStretches.FontStretchStringToKnownStretch(s, ci, ref fontStretch)) throw new FormatException(SR.Get(SRID.Parsers_IllegalToken)); return fontStretch; } ////// TypeConverter method implementation. /// ////// An NotSupportedException is thrown if the example object is null or is not a FontStretch, /// or if the destinationType isn't one of the valid destination types. /// /// ITypeDescriptorContext /// current culture (see CLR specs) /// value to convert from /// Type to convert to ///converted value ////// Critical: calls InstanceDescriptor ctor which LinkDemands /// PublicOK: can only make an InstanceDescriptor for FontStretch.FromOpenTypeStretch, not an arbitrary class/method /// [SecurityCritical] public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType != null && value is FontStretch) { if (destinationType == typeof(InstanceDescriptor)) { MethodInfo mi = typeof(FontStretch).GetMethod("FromOpenTypeStretch", new Type[]{typeof(int)}); FontStretch c = (FontStretch)value; return new InstanceDescriptor(mi, new object[]{c.ToOpenTypeStretch()}); } else if (destinationType == typeof(string)) { FontStretch c = (FontStretch)value; return ((IFormattable)c).ToString(null, culture); } } // Pass unhandled cases to base class (which will throw exceptions for null value or destinationType.) 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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