// FIXME: Linear scan
public static Color FindColorMatch(Color c)
{
uint argb = (uint)c.ToArgb();
// 1-based
const int first_real_color_index = (int)KnownColor.AliceBlue;
const int last_real_color_index = (int)KnownColor.YellowGreen;
for (int i = first_real_color_index - 1; i < last_real_color_index; i++)
{
if (argb == KnownColors.ArgbValues[i])
{
return(KnownColors.FromKnownColor((KnownColor)i));
}
}
return(Color.Empty);
}
public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
{
lock (creatingCached)
{
if (cached != null)
{
return(cached);
}
Array colors = Array.CreateInstance(typeof(Color), KnownColors.ArgbValues.Length - 1);
for (int i = 1; i < KnownColors.ArgbValues.Length; i++)
{
colors.SetValue(KnownColors.FromKnownColor((KnownColor)i), i - 1);
}
Array.Sort(colors, 0, colors.Length, new CompareColors());
cached = new StandardValuesCollection(colors);
}
return(cached);
}
private Color CreateColor(KnownColor c)
{
return(KnownColors.FromKnownColor(c));
}
internal static Color StaticConvertFromString(ITypeDescriptorContext context, string s, CultureInfo culture)
{
if (culture == null)
{
culture = CultureInfo.InvariantCulture;
}
s = s.Trim();
if (s.Length == 0)
{
return(Color.Empty);
}
// Try to process both NamedColor and SystemColors from the KnownColor enumeration
if (Char.IsLetter(s[0]))
{
KnownColor kc;
try
{
kc = (KnownColor)Enum.Parse(typeof(KnownColor), s, true);
}
catch (Exception e)
{
// whatever happens MS throws an basic Exception
string msg = String.Format("Invalid color name '{0}'.", s);
throw new Exception(msg, new FormatException(msg, e));
}
return(KnownColors.FromKnownColor(kc));
}
String numSeparator = culture.TextInfo.ListSeparator;
Color result = Color.Empty;
try
{
result = new Color(s);
}
catch (Exception e)
{
// whatever happens MS throws an basic Exception
string msg = String.Format("Invalid Int32 value '{0}'.", s);
throw new Exception(msg, e);
}
if (result.IsEmpty)
{
Int32Converter converter = new Int32Converter();
String[] components = s.Split(numSeparator.ToCharArray());
// MS seems to convert the indivual component to int before
// checking the number of components
int[] numComponents = new int[components.Length];
for (int i = 0; i < numComponents.Length; i++)
{
numComponents[i] = (int)converter.ConvertFrom(context,
culture, components[i]);
}
switch (components.Length)
{
case 1:
result = new Color(Convert.ToUInt32(numComponents[0]));
break;
case 3:
result = new Color((byte)numComponents[0], (byte)numComponents[1],
(byte)numComponents[2]);
break;
case 4:
result = new Color((byte)numComponents[0], (byte)numComponents[1],
(byte)numComponents[2], (byte)numComponents[3]);
break;
default:
throw new ArgumentException(s + " is not a valid color value.");
}
}
if (!result.IsEmpty)
{
// Look for a named or system color with those values
Color known = KnownColors.FindColorMatch(result);
if (!known.IsEmpty)
{
return(known);
}
}
return(result);
}
