CornerRadiusConverter.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / CornerRadiusConverter.cs / 1 / CornerRadiusConverter.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: CornerRadiusConverter.cs 
//
// Description: Contains the CornerRadiusConverter: TypeConverter for the CornerRadiusclass. 
// 
// History:
//  07/19/2004 : [....] - Created 
//
//---------------------------------------------------------------------------

using System; 
using System.ComponentModel;
using System.ComponentModel.Design.Serialization; 
using System.Globalization; 
using System.Reflection;
using System.Text; 
using System.Windows;
using System.Security;
using MS.Internal;
using MS.Utility; 

#pragma warning disable 1634, 1691  // suppressing PreSharp warnings 
 
namespace System.Windows
{ 
    /// 
    /// CornerRadiusConverter - Converter class for converting instances of other types to and from CornerRadius instances.
    /// 
    public class CornerRadiusConverter : TypeConverter 
    {
        #region Public Methods 
 
        /// 
        /// CanConvertFrom - Returns whether or not this class can convert from a given type. 
        /// 
        /// 
        /// bool - True if thie converter can convert from the provided type, false if not.
        ///  
        ///  The ITypeDescriptorContext for this call. 
        ///  The Type being queried for support.  
        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;
            } 
        }

        /// 
        /// CanConvertTo - Returns whether or not this class can convert to a given type. 
        /// 
        ///  
        /// bool - True if this converter can convert to the provided type, false if not. 
        /// 
        ///  The ITypeDescriptorContext for this call.  
        ///  The Type being queried for support. 
        public override bool CanConvertTo(ITypeDescriptorContext typeDescriptorContext, Type destinationType)
        {
            // We can convert to an InstanceDescriptor or to a string. 
            if (    destinationType == typeof(InstanceDescriptor)
                ||  destinationType == typeof(string)) 
            { 
                return true;
            } 
            else
            {
                return false;
            } 
        }
 
        ///  
        /// ConvertFrom - Attempt to convert to a CornerRadius from the given object
        ///  
        /// 
        /// The CornerRadius 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 CornerRadius. 
        /// 
        ///  The ITypeDescriptorContext for this call. 
        ///  The CultureInfo which is respected when converting. 
        ///  The object to convert to a CornerRadius.  
        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 CornerRadius(Convert.ToDouble(source, cultureInfo)); }
            }
            throw GetConvertFromException(source);
        } 

//Workaround for PreSharp bug - it complains about value being possibly null even though there is a check above 
#pragma warning disable 56506 

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

            if (null == destinationType)
            {
                throw new ArgumentNullException("destinationType"); 
            }
 
            if (!(value is CornerRadius)) 
            {
                #pragma warning suppress 6506 // value is obviously not null 
                throw new ArgumentException(SR.Get(SRID.UnexpectedParameterType, value.GetType(), typeof(CornerRadius)), "value");
            }

            CornerRadius cr = (CornerRadius)value; 
            if (destinationType == typeof(string)) { return ToString(cr, cultureInfo); }
            if (destinationType == typeof(InstanceDescriptor)) 
            { 
                ConstructorInfo ci = typeof(CornerRadius).GetConstructor(new Type[] { typeof(double), typeof(double), typeof(double), typeof(double) });
                return new InstanceDescriptor(ci, new object[] { cr.TopLeft, cr.TopRight, cr.BottomRight, cr.BottomLeft }); 
            }

            throw new ArgumentException(SR.Get(SRID.CannotConvertType, typeof(CornerRadius), destinationType.FullName));
        } 

//Workaround for PreSharp bug - it complains about value being possibly null even though there is a check above 
#pragma warning restore 56506 

        #endregion Public Methods 

        //-------------------------------------------------------------------
        //
        //  Internal Methods 
        //
        //------------------------------------------------------------------- 
 
        #region Internal Methods
 
        static internal string ToString(CornerRadius cr, CultureInfo cultureInfo)
        {
            char listSeparator = TokenizerHelper.GetNumericListSeparator(cultureInfo);
 
            // Initial capacity [64] is an estimate based on a sum of:
            // 48 = 4x double (twelve digits is generous for the range of values likely) 
            //  8 = 4x UnitType string (approx two characters) 
            //  4 = 4x separator characters
            StringBuilder sb = new StringBuilder(64); 

            sb.Append(cr.TopLeft.ToString(cultureInfo));
            sb.Append(listSeparator);
            sb.Append(cr.TopRight.ToString(cultureInfo)); 
            sb.Append(listSeparator);
            sb.Append(cr.BottomRight.ToString(cultureInfo)); 
            sb.Append(listSeparator); 
            sb.Append(cr.BottomLeft.ToString(cultureInfo));
            return sb.ToString(); 
        }

        static internal CornerRadius FromString(string s, CultureInfo cultureInfo)
        { 
            TokenizerHelper th = new TokenizerHelper(s, cultureInfo);
            double[] radii = new double[4]; 
            int i = 0; 

            // Peel off each Length in the delimited list. 
            while (th.NextToken())
            {
                if (i >= 4)
                { 
                    i = 5;    // Set i to a bad value.
                    break; 
                } 

                radii[i] = double.Parse(th.GetCurrentToken(), cultureInfo); 
                i++;
            }

            // We have a reasonable interpreation for one value (all four edges) 
            // and four values (left, top, right, bottom).
            switch (i) 
            { 
                case 1:
                    return (new CornerRadius(radii[0])); 

                case 4:
                    return (new CornerRadius(radii[0], radii[1], radii[2], radii[3]));
            } 

            throw new FormatException(SR.Get(SRID.InvalidStringCornerRadius, s)); 
        } 
        #endregion
    } 
}

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