public NSColor NSColorFromHexString (string hexValue)
{
var colorString = hexValue.Replace ("#", "");
float red, green, blue, alpha;
// Convert color based on length
switch (colorString.Length) {
case 3 : // #RGB
red = Convert.ToInt32(string.Format("{0}{0}", colorString.Substring(0, 1)), 16) / 255f;
green = Convert.ToInt32(string.Format("{0}{0}", colorString.Substring(1, 1)), 16) / 255f;
blue = Convert.ToInt32(string.Format("{0}{0}", colorString.Substring(2, 1)), 16) / 255f;
return NSColor.FromRgba(red, green, blue, 1.0f);
case 6 : // #RRGGBB
red = Convert.ToInt32(colorString.Substring(0, 2), 16) / 255f;
green = Convert.ToInt32(colorString.Substring(2, 2), 16) / 255f;
blue = Convert.ToInt32(colorString.Substring(4, 2), 16) / 255f;
return NSColor.FromRgba(red, green, blue, 1.0f);
case 8 : // #AARRGGBB
alpha = Convert.ToInt32(colorString.Substring(0, 2), 16) / 255f;
red = Convert.ToInt32(colorString.Substring(2, 2), 16) / 255f;
green = Convert.ToInt32(colorString.Substring(4, 2), 16) / 255f;
blue = Convert.ToInt32(colorString.Substring(6, 2), 16) / 255f;
return NSColor.FromRgba(red, green, blue, alpha);
default :
throw new ArgumentOutOfRangeException(string.Format("Invalid color value '{0}'. It should be a hex value of the form #RBG, #RRGGBB or #AARRGGBB", hexValue));
}
}
