KeyTimeConverter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / Animation / KeyTimeConverter.cs / 1305600 / KeyTimeConverter.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation, 2001-2003
//
//  File: KeyTimeConverter.cs 
//-----------------------------------------------------------------------------
 
using System; 
using System.ComponentModel;
using System.ComponentModel.Design.Serialization; 
using System.Globalization;
using System.Reflection;
using System.Windows.Media.Animation;
using System.Security; 

namespace System.Windows 
{ 
    /// 
    /// 
    /// 
    public class KeyTimeConverter : TypeConverter
    {
        #region Data 

        private static char[] _percentCharacter = new char[] { '%' }; 
 
        #endregion
 
        /// 
        /// Returns whether or not this class can convert from a given type
        /// to an instance of a KeyTime.
        ///  
        public override bool CanConvertFrom(
            ITypeDescriptorContext typeDescriptorContext, 
            Type type) 
        {
            if (type == typeof(string)) 
            {
                return true;
            }
            else 
            {
                return base.CanConvertFrom( 
                    typeDescriptorContext, 
                    type);
            } 
        }

        /// 
        /// Returns whether or not this class can convert from an instance of a 
        /// KeyTime to a given type.
        ///  
        public override bool CanConvertTo( 
            ITypeDescriptorContext typeDescriptorContext,
            Type type) 
        {
            if (   type == typeof(InstanceDescriptor)
                || type == typeof(string))
            { 
                return true;
            } 
            else 
            {
                return base.CanConvertTo( 
                    typeDescriptorContext,
                    type);
            }
        } 

        ///  
        /// 
        /// 
        public override object ConvertFrom( 
            ITypeDescriptorContext typeDescriptorContext,
            CultureInfo cultureInfo,
            object value)
        { 
            string stringValue = value as string;
 
            if (stringValue != null) 
            {
                stringValue = stringValue.Trim(); 

                if (stringValue == "Uniform")
                {
                    return KeyTime.Uniform; 
                }
                else if (stringValue == "Paced") 
                { 
                    return KeyTime.Paced;
                } 
                else if (stringValue[stringValue.Length - 1] == _percentCharacter[0])
                {
                    stringValue = stringValue.TrimEnd(_percentCharacter);
 
                    double doubleValue = (double)TypeDescriptor.GetConverter(
                        typeof(double)).ConvertFrom( 
                            typeDescriptorContext, 
                            cultureInfo,
                            stringValue); 

                    if (doubleValue == 0.0)
                    {
                        return KeyTime.FromPercent(0.0); 
                    }
                    else if (doubleValue == 100.0) 
                    { 
                        return KeyTime.FromPercent(1.0);
                    } 
                    else
                    {
                        return KeyTime.FromPercent(doubleValue / 100.0);
                    } 
                }
                else 
                { 
                    TimeSpan timeSpanValue = (TimeSpan)TypeDescriptor.GetConverter(
                        typeof(TimeSpan)).ConvertFrom( 
                            typeDescriptorContext,
                            cultureInfo,
                            stringValue);
 
                    return KeyTime.FromTimeSpan(timeSpanValue);
                } 
            } 

            return base.ConvertFrom( 
                typeDescriptorContext,
                cultureInfo,
                value);
        } 

        ///  
        /// 
        /// 
        /// 
        ///     Critical: calls InstanceDescriptor ctor which LinkDemands
        ///     PublicOK: can only make an InstanceDescriptor for KeyTime, not an arbitrary class
        ///
        [SecurityCritical] 
        public override object ConvertTo(
            ITypeDescriptorContext typeDescriptorContext, 
            CultureInfo cultureInfo, 
            object value,
            Type destinationType) 
        {
            if (   value != null
                && value is KeyTime)
            { 
                KeyTime keyTime = (KeyTime)value;
 
                if (destinationType == typeof(InstanceDescriptor)) 
                {
                    MemberInfo mi; 

                    switch (keyTime.Type)
                    {
                        case KeyTimeType.Percent: 

                            mi = typeof(KeyTime).GetMethod("FromPercent", new Type[] { typeof(double) }); 
 
                            return new InstanceDescriptor(mi, new object[] { keyTime.Percent });
 
                        case KeyTimeType.TimeSpan:

                            mi = typeof(KeyTime).GetMethod("FromTimeSpan", new Type[] { typeof(TimeSpan) });
 
                            return new InstanceDescriptor(mi, new object[] { keyTime.TimeSpan });
 
                        case KeyTimeType.Uniform: 

                            mi = typeof(KeyTime).GetProperty("Uniform"); 

                            return new InstanceDescriptor(mi, null);

                        case KeyTimeType.Paced: 

                            mi = typeof(KeyTime).GetProperty("Paced"); 
 
                            return new InstanceDescriptor(mi, null);
                    } 
                }
                else if (destinationType == typeof(String))
                {
                    switch (keyTime.Type) 
                    {
                        case KeyTimeType.Uniform: 
 
                            return "Uniform";
 
                        case KeyTimeType.Paced:

                            return "Paced";
 
                        case KeyTimeType.Percent:
 
                            string returnValue = (string)TypeDescriptor.GetConverter( 
                                typeof(Double)).ConvertTo(
                                    typeDescriptorContext, 
                                    cultureInfo,
                                    keyTime.Percent * 100.0,
                                    destinationType);
 
                            return returnValue + _percentCharacter[0].ToString();
 
                        case KeyTimeType.TimeSpan: 

                            return TypeDescriptor.GetConverter( 
                                typeof(TimeSpan)).ConvertTo(
                                    typeDescriptorContext,
                                    cultureInfo,
                                    keyTime.TimeSpan, 
                                    destinationType);
                    } 
                } 
            }
 
            return base.ConvertTo(
                typeDescriptorContext,
                cultureInfo,
                value, 
                destinationType);
        } 
    } 
}

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

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