FontSizeConverter.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / FontSizeConverter.cs / 1 / FontSizeConverter.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: FontSizeConverter.cs 
//
// Description: Converter for FontSize to Double 
// 
// History:
//  01/12/05 : [....] - Ported from FontSize 
//
//---------------------------------------------------------------------------

using System; 
using System.IO;
using System.Diagnostics; 
using System.ComponentModel; 

using System.ComponentModel.Design.Serialization; 
using System.Reflection;                // for ConstructorInfo
using System.Globalization;             // for CultureInfo
using MS.Utility;                       // For ExceptionStringTable
using System.Windows.Media;           // for Typeface 
using System.Windows.Controls;        // for ReadingPanel
using System.Windows.Documents; 
using  System.Windows.Markup; 
using MS.Internal;
using MS.Internal.Text; 
using MS.Internal.Documents;

namespace System.Windows
{ 

    ///  
    /// TypeConverter to convert FontSize to/from other types. 
    /// Currently: string, int, float, and double are supported.
    ///  
    //  Used by Parser to parse BoxUnits from markup.
    public class FontSizeConverter : TypeConverter
    {
        ///  
        /// TypeConverter method override.
        ///  
        /// ITypeDescriptorContext 
        /// Type to convert from
        /// true if conversion is possible 
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
        {
            return (sourceType == typeof(string)
                || sourceType == typeof(int) 
                || sourceType == typeof(float)
                || sourceType == typeof(double)); 
        } 

        ///  
        /// 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))
            { 
                return true;
            }

            return base.CanConvertTo(context, destinationType); 
        }
 
        ///  
        /// TypeConverter method implementation.
        ///  
        /// ITypeDescriptorContext
        /// Current culture (see CLR specs)
        /// value to convert from
        /// value that is result of conversion 
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
        { 
            if (value == null) 
            {
                throw GetConvertFromException(value); 
            }

            // NB: The culture passed from Avalon parser should always be the invariant culture.
            //     Do we care about usage in other circumstances? 
            string text = value as string;
 
            if (text != null) 
            {
                double       amount; 

                FromString(text, culture,
                    out amount);
                return amount; 
            }
 
            if (value is System.Int32 || value is System.Single || value is System.Double) 
            {
                return (double)value; 
            }

         // Can't convert, wrong type
            return null; 
        }
 
        ///  
        /// TypeConverter method implementation.
        ///  
        /// ITypeDescriptorContext
        /// current culture (see CLR specs)
        /// value to convert from
        /// Type to convert to 
        /// converted value
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) 
        { 
            if (destinationType == null)
            { 
                throw new ArgumentNullException("destinationType");
            }

            double fs = (double)value; 

            if (destinationType == typeof(string)) 
            { 
                return fs.ToString(culture);
            } 

            if (destinationType == typeof(int))
            {
                return (int)fs; 
            }
 
            if (destinationType == typeof(float)) 
            {
                return (float)fs; 
            }

            if (destinationType == typeof(double))
            { 
                return fs;
            } 
 
            return base.ConvertTo(context, culture, value, destinationType);
        } 


        ///
        /// Convert a string into an amount and a font size type that can be used to create 
        /// and instance of a Fontsize, or to serialize in a more compact representation to
        /// a baml stream. 
        /// 
        internal static void FromString(
                string       text, 
                CultureInfo  culture,
            out double       amount)
        {
            amount = LengthConverter.FromString(text, culture); 
        }
    } 
} 

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

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