figurelengthconverter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / figurelengthconverter.cs / 1305600 / figurelengthconverter.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Figure length converter implementation 
//
// History: 
//  06/23/2005 : ghermann - Created (Adapted from GridLengthConverter)
//
//---------------------------------------------------------------------------
 
using MS.Internal;
using MS.Utility; 
using System.ComponentModel; 
using System.Windows;
using System; 
using System.Security;
using System.ComponentModel.Design.Serialization;
using System.Diagnostics;
using System.Globalization; 
using System.Reflection;
using System.Windows.Markup; 
 
namespace System.Windows
{ 
    /// 
    /// FigureLengthConverter - Converter class for converting
    /// instances of other types to and from FigureLength instances.
    ///  
    public class FigureLengthConverter: TypeConverter
    { 
        //------------------------------------------------------------------- 
        //
        //  Public Methods 
        //
        //-------------------------------------------------------------------

        #region Public Methods 

        ///  
        /// Checks whether or not this class can convert from a given type. 
        /// 
        /// The ITypeDescriptorContext 
        /// for this call.
        /// The Type being queried for support.
        /// 
        /// true if thie converter can convert from the provided type, 
        /// false otherwise.
        ///  
        public override bool CanConvertFrom( 
            ITypeDescriptorContext typeDescriptorContext,
            Type sourceType) 
        {
            // We can only handle strings, integral and floating types
            TypeCode tc = Type.GetTypeCode(sourceType);
            switch (tc) 
            {
                case TypeCode.String: 
                case TypeCode.Decimal: 
                case TypeCode.Single:
                case TypeCode.Double: 
                case TypeCode.Int16:
                case TypeCode.Int32:
                case TypeCode.Int64:
                case TypeCode.UInt16: 
                case TypeCode.UInt32:
                case TypeCode.UInt64: 
                    return true; 
                default:
                    return false; 
            }
        }

        ///  
        /// Checks whether or not this class can convert to a given type.
        ///  
        /// The ITypeDescriptorContext 
        /// for this call.
        /// The Type being queried for support. 
        /// 
        /// true if this converter can convert to the provided type,
        /// false otherwise.
        ///  
        public override bool CanConvertTo(
            ITypeDescriptorContext typeDescriptorContext, 
            Type destinationType) 
        {
            return (    destinationType == typeof(InstanceDescriptor) 
                    ||  destinationType == typeof(string)   );
        }

        ///  
        /// Attempts to convert to a FigureLength from the given object.
        ///  
        /// The ITypeDescriptorContext for this call. 
        /// The CultureInfo which is respected when converting.
        /// The object to convert to a FigureLength. 
        /// 
        /// The FigureLength instance which was constructed.
        /// 
        ///  
        /// An ArgumentNullException is thrown if the example object is null.
        ///  
        ///  
        /// An ArgumentException is thrown if the example object is not null
        /// and is not a valid type which can be converted to a FigureLength. 
        /// 
        public override object ConvertFrom(
            ITypeDescriptorContext typeDescriptorContext,
            CultureInfo cultureInfo, 
            object source)
        { 
            if (source != null) 
            {
                if (source is string) 
                {
                    return (FromString((string)source, cultureInfo));
                }
                else 
                {
                    return new FigureLength(Convert.ToDouble(source, cultureInfo)); //conversion from numeric type 
                } 
            }
            throw GetConvertFromException(source); 
        }

        /// 
        /// Attempts to convert a FigureLength instance to the given type. 
        /// 
        /// The ITypeDescriptorContext for this call. 
        /// The CultureInfo which is respected when converting. 
        /// The FigureLength to convert.
        /// The type to which to convert the FigureLength instance. 
        /// 
        /// The object which was constructed.
        /// 
        ///  
        /// An ArgumentNullException is thrown if the example object is null.
        ///  
        ///  
        /// An ArgumentException is thrown if the object is not null and is not a FigureLength,
        /// or if the destinationType isn't one of the valid destination types. 
        /// 
        ///
        ///     Critical: calls InstanceDescriptor ctor which LinkDemands
        ///     PublicOK: can only make an InstanceDescriptor for FigureLength, not an arbitrary class 
        ///
        [SecurityCritical] 
        public override object ConvertTo( 
            ITypeDescriptorContext typeDescriptorContext,
            CultureInfo cultureInfo, 
            object value,
            Type destinationType)
        {
            if (destinationType == null) 
            {
                throw new ArgumentNullException("destinationType"); 
            } 

            if (    value != null 
                &&  value is FigureLength )
            {
                FigureLength fl = (FigureLength)value;
 
                if (destinationType == typeof(string))
                { 
                    return (ToString(fl, cultureInfo)); 
                }
 
                if (destinationType == typeof(InstanceDescriptor))
                {
                    ConstructorInfo ci = typeof(FigureLength).GetConstructor(new Type[] { typeof(double), typeof(FigureUnitType) });
                    return (new InstanceDescriptor(ci, new object[] { fl.Value, fl.FigureUnitType })); 
                }
            } 
            throw GetConvertToException(value, destinationType); 
        }
 
        #endregion Public Methods

        //--------------------------------------------------------------------
        // 
        //  Internal Methods
        // 
        //------------------------------------------------------------------- 

        #region Internal Methods 

        /// 
        /// Converts a FigureLength instance to a String given the CultureInfo.
        ///  
        /// FigureLength instance to convert.
        /// Culture Info. 
        /// String representation of the object. 
        static internal string ToString(FigureLength fl, CultureInfo cultureInfo)
        { 
            switch (fl.FigureUnitType)
            {
                //  for Auto print out "Auto". value is always "1.0"
                case FigureUnitType.Auto: 
                    return ("Auto");
 
                case FigureUnitType.Pixel: 
                    return Convert.ToString(fl.Value, cultureInfo);
 
                default:
                    return Convert.ToString(fl.Value, cultureInfo) + " " + fl.FigureUnitType.ToString();
            }
        } 

        ///  
        /// Parses a FigureLength from a string given the CultureInfo. 
        /// 
        /// String to parse from. 
        /// Culture Info.
        /// Newly created FigureLength instance.
        /// 
        /// Formats: 
        /// "[value][unit]"
        ///     [value] is a double 
        ///     [unit] is a string in FigureLength._unitTypes connected to a FigureUnitType 
        /// "[value]"
        ///     As above, but the FigureUnitType is assumed to be FigureUnitType.Pixel 
        /// "[unit]"
        ///     As above, but the value is assumed to be 1.0
        ///     This is only acceptable for a subset of FigureUnitType: Auto
        ///  
        static internal FigureLength FromString(string s, CultureInfo cultureInfo)
        { 
            double value; 
            FigureUnitType unit;
            XamlFigureLengthSerializer.FromString(s, cultureInfo, 
                out value, out unit);

            return (new FigureLength(value, unit));
        } 

        #endregion Internal Methods 
 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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