FontTypeConverter.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Print / Reach / Serialization / FontTypeConverter.cs / 2 / FontTypeConverter.cs
                        
                        
                            /*++ 

    Copyright (C) 2004 - 2005 Microsoft Corporation
    All rights reserved.
 
    Module Name:
        FontTypeConverter.cs 
 
    Abstract:
        This file implements the FontTypeConverter used by 
        the Xps Serialization APIs for serializing fonts
        to a Xps package.

    Author: 
        [....] ([....]) 1-December-2004
 
    Revision History: 
--*/
 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO; 
using System.Windows.Media;
using System.Windows.Xps.Packaging; 
 
namespace System.Windows.Xps.Serialization
{ 
    /// 
    /// This class implements a type converter for converting
    /// fonts to Uris.  It handles the writing of the font
    /// to a Xps package and returns a package URI to the 
    /// caller.  It also handles reading a font from a
    /// Xps package given a Uri. 
    ///  
    public class FontTypeConverter : ExpandableObjectConverter
    { 
        #region Public overrides for ExpandableObjectConverted

        /// 
        /// Returns whether this converter can convert an object 
        /// of the given type to the type of this converter.
        ///  
        ///  
        /// An ITypeDescriptorContext that provides a format context.
        ///  
        /// 
        /// A Type that represents the type you want to convert from.
        /// 
        ///  
        /// true if this converter can perform the conversion;
        /// otherwise, false. 
        ///  
        public
        override 
        bool
        CanConvertFrom(
            ITypeDescriptorContext      context,
            Type                        sourceType 
            )
        { 
            return IsSupportedType(sourceType); 
        }
 
        /// 
        /// Returns whether this converter can convert the object
        /// to the specified type.
        ///  
        /// 
        /// An ITypeDescriptorContext that provides a format context. 
        ///  
        /// 
        /// A Type that represents the type you want to convert to. 
        /// 
        /// 
        /// true if this converter can perform the conversion;
        /// otherwise, false. 
        /// 
        public 
        override 
        bool
        CanConvertTo( 
            ITypeDescriptorContext      context,
            Type                        destinationType
            )
        { 
            return IsSupportedType(destinationType);
        } 
 
        /// 
        /// Converts the given value to the type of this converter. 
        /// 
        /// 
        /// An ITypeDescriptorContext that provides a format context.
        ///  
        /// 
        /// The CultureInfo to use as the current culture. 
        ///  
        /// 
        /// The Object to convert. 
        /// 
        /// 
        /// An Object that represents the converted value.
        ///  
        public
        override 
        object 
        ConvertFrom(
            ITypeDescriptorContext              context, 
            System.Globalization.CultureInfo    culture,
            object                              value
            )
        { 
            if( value == null )
            { 
                throw new ArgumentNullException("value"); 
            }
            if (!IsSupportedType(value.GetType())) 
            {
                throw new NotSupportedException(ReachSR.Get(ReachSRID.Converter_ConvertFromNotSupported));
            }
 
            throw new NotImplementedException();
        } 
 
        /// 
        /// Converts the given value object to the specified type, 
        /// using the arguments.
        /// 
        /// 
        /// An ITypeDescriptorContext that provides a format context. 
        /// 
        ///  
        /// A CultureInfo object. If null is passed, the current 
        /// culture is assumed.
        ///  
        /// 
        /// The Object to convert.
        /// 
        ///  
        /// The Type to convert the value parameter to.
        ///  
        ///  
        /// The Type to convert the value parameter to.
        ///  
        public
        override
        object
        ConvertTo( 
            ITypeDescriptorContext              context,
            System.Globalization.CultureInfo    culture, 
            object                              value, 
            Type                                destinationType
            ) 
        {
            if( context == null )
            {
                throw new ArgumentNullException("context"); 
            }
            Toolbox.StartEvent(MS.Utility.EventTraceGuidId.DRXCONVERTFONTGUID); 
 
            if (!IsSupportedType(destinationType))
            { 
                throw new NotSupportedException(ReachSR.Get(ReachSRID.Converter_ConvertToNotSupported));
            }

            PackageSerializationManager manager = (PackageSerializationManager)context.GetService(typeof(XpsSerializationManager)); 
            //
            // Ensure that we have a valid GlyphRun instance 
            // 
            GlyphRun fontGlyphRun = (GlyphRun)value;
            if (fontGlyphRun == null) 
            {
                throw new ArgumentException(ReachSR.Get(ReachSRID.MustBeOfType, "value", "GlyphRun"));
            }
 
            //
            // Obtain the font serialization service from the serlialization manager. 
            // 
            IServiceProvider resourceServiceProvider = manager.ResourcePolicy;
            XpsFontSerializationService fontService = (XpsFontSerializationService)resourceServiceProvider.GetService(typeof(XpsFontSerializationService)); 
            if (fontService == null)
            {
                throw new XpsSerializationException(ReachSR.Get(ReachSRID.ReachSerialization_NoFontService));
            } 

            // 
            // Retrieve the current font subsetter 
            //
            XpsFontSubsetter fontSubsetter = fontService.FontSubsetter; 

            //
            // Add the font subset to the font subsetter and retrieve a Uri
            // to the font within the Xps package. 
            //
            Uri resourceUri = fontSubsetter.ComputeFontSubset(fontGlyphRun); 
 
            Toolbox.EndEvent(MS.Utility.EventTraceGuidId.DRXCONVERTFONTGUID);
 
            return resourceUri;
        }

        ///  
        /// Gets a collection of properties for the type of object
        /// specified by the value parameter. 
        ///  
        /// 
        /// An ITypeDescriptorContext that provides a format context. 
        /// 
        /// 
        /// An Object that specifies the type of object to get the
        /// properties for. 
        /// 
        ///  
        /// An array of type Attribute that will be used as a filter. 
        /// 
        ///  
        /// A PropertyDescriptorCollection with the properties that are
        /// exposed for the component, or null if there are no properties.
        /// 
        public 
        override
        PropertyDescriptorCollection 
        GetProperties( 
            ITypeDescriptorContext      context,
            object                      value, 
            Attribute[]                 attributes
            )
        {
            throw new NotImplementedException(); 
        }
 
        #endregion Public overrides for ExpandableObjectConverted 

        #region Private static helper methods 

        /// 
        /// Looks up the type in a table to determine
        /// whether this type is supported by this 
        /// class.
        ///  
        ///  
        /// Type to lookup in table.
        ///  
        /// 
        /// True is supported; otherwise false.
        /// 
        private 
        static
        bool 
        IsSupportedType( 
            Type    type
            ) 
        {
            bool bSupported = false;

            foreach (Type t in SupportedTargetTypes) 
            {
                if (t.Equals(type)) 
                { 
                    bSupported = true;
                    break; 
                }
            }

            return bSupported; 
        }
 
        #endregion Private static helper methods 

        #region Private static data 

        /// 
        /// A table of supported types for this type converter
        ///  
        private static Type[] SupportedTargetTypes = {
            typeof(Uri) 
        }; 

        #endregion Private static data 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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FontTypeConverter.cs source code in C# .NET

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