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/**
* Namespace: System.Web.UI.WebControls
* Class: WebColorConverter
*
* Author: Gaurav Vaish, Gonzalo Paniagua Javier
* Maintainer: gvaish@iitk.ac.in
* Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>, <gonzalo@ximian.com>
* Implementation: yes
* Status: 100%
*
* (C) Gaurav Vaish (2002)
* (c) 2002 Ximian, Inc. (http://www.ximian.com)
*/
using System;
using System.Globalization;
using System.ComponentModel;
using System.Drawing;
using System.Web;
using System.Web.UI;
namespace System.Web.UI.WebControls
{
public class WebColorConverter : ColorConverter
{
public override object ConvertFrom (ITypeDescriptorContext context,
CultureInfo culture,
object value)
{
if (value is string) {
string val = ((string) value).Trim ();
if(val == String.Empty || val.Length == 0)
return Color.Empty;
NumberStyles style = (val [0] == '#') ? NumberStyles.HexNumber :
NumberStyles.None;
try {
int n = Int32.Parse (val.Substring (1), style);
return Color.FromArgb (n);
} catch {
Color c = Color.FromName (val);
if (c.A != 0 || c.R != 0 || c.B != 0 || c.G != 0)
return c;
}
}
return base.ConvertFrom(context, culture, value);
}
public override object ConvertTo (ITypeDescriptorContext context,
CultureInfo culture,
object value,
Type destinationType)
{
if (destinationType == null)
throw new ArgumentNullException ("destinationType");
if (destinationType == typeof (String) && value != null) {
Color c = (Color) value;
if (c == Color.Empty)
return String.Empty;
if (c.IsNamedColor || c.IsSystemColor)
return c.Name;
return String.Format ("#{0:X2}{1:X2}{2:X2}{3:X2}", c.A, c.R, c.G, c.B);
}
return base.ConvertTo(context, culture, value, destinationType);
}
}
}
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