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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Reflection;
using MS.Internal;
using System.Globalization;
namespace System.Windows.Media
{
/// <summary>
/// ColorConverter Parses a color.
/// </summary>
public sealed class ColorConverter : TypeConverter
{
/// <summary>
/// CanConvertFrom
/// </summary>
public override bool CanConvertFrom(ITypeDescriptorContext td, Type t)
{
if (t == typeof(string))
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// TypeConverter method override.
/// </summary>
/// <param name="context">ITypeDescriptorContext</param>
/// <param name="destinationType">Type to convert to</param>
/// <returns>true if conversion is possible</returns>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
{
if (destinationType == typeof(InstanceDescriptor))
{
return true;
}
return base.CanConvertTo(context, destinationType);
}
///<summary>
/// ConvertFromString
///</summary>
public static new object ConvertFromString(string value)
{
if ( null == value)
{
return null;
}
return Parsers.ParseColor(value, null);
}
/// <summary>
/// ConvertFrom - attempt to convert to a Color from the given object
/// </summary>
/// <exception cref="NotSupportedException">
/// A NotSupportedException is thrown if the example object is null or is not a valid type
/// which can be converted to a Color.
/// </exception>
public override object ConvertFrom(ITypeDescriptorContext td, System.Globalization.CultureInfo ci, object value)
{
if (null == value)
{
throw GetConvertFromException(value);
}
String s = value as string;
if (null == s)
{
throw new ArgumentException(SR.Format(SR.General_BadType, "ConvertFrom"), "value");
}
return Parsers.ParseColor(value as string, ci, td);
}
/// <summary>
/// TypeConverter method implementation.
/// </summary>
/// <exception cref="NotSupportedException">
/// An NotSupportedException is thrown if the example object is null or is not a Color,
/// or if the destinationType isn't one of the valid destination types.
/// </exception>
/// <param name="context">ITypeDescriptorContext</param>
/// <param name="culture">current culture (see CLR specs)</param>
/// <param name="value">value to convert from</param>
/// <param name="destinationType">Type to convert to</param>
/// <returns>converted value</returns>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType != null && value is Color)
{
if (destinationType == typeof(InstanceDescriptor))
{
MethodInfo mi = typeof(Color).GetMethod("FromArgb", new Type[]{typeof(byte), typeof(byte), typeof(byte), typeof(byte)});
Color c = (Color)value;
return new InstanceDescriptor(mi, new object[]{c.A, c.R, c.G, c.B});
}
else if (destinationType == typeof(string))
{
Color c = (Color)value;
return c.ToString(culture);
}
}
// Pass unhandled cases to base class (which will throw exceptions for null value or destinationType.)
return base.ConvertTo(context, culture, value, destinationType);
}
}
}
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