static CSSImageValue Image(List <CSSValue> arguments)
{
if (arguments.Count == 0)
{
return(null);
}
var imageList = new List <Location>();
foreach (var argument in arguments)
{
var uri = argument.ToUri();
if (uri == null)
{
if (argument is CSSStringValue)
{
uri = new Location(((CSSStringValue)argument).Value);
}
else
{
return(null);
}
}
imageList.Add(uri);
}
return(CSSImageValue.FromUrls(imageList));
}
static CSSImageValue GeneralLinearGradient(List <CSSValue> arguments, Boolean repeating)
{
if (arguments.Count > 1)
{
var direction = Angle.Zero;
var angle = arguments[0].ToAngle();
var offset = 0;
if (angle.HasValue)
{
direction = angle.Value;
offset++;
}
var stops = new CSSImageValue.GradientStop[arguments.Count - offset];
if (stops.Length > 1)
{
var perStop = 100f / (arguments.Count - offset - 1);
for (int i = offset, k = 0; i < arguments.Count; i++, k++)
{
CSSPrimitiveValue <Color> color = null;
var location = CSSCalcValue.FromPercent(new Percent(perStop * k));
if (arguments[i] is CSSValueList)
{
var list = (CSSValueList)arguments[i];
if (list.Length != 2)
{
return(null);
}
color = list[0].AsColor();
location = list[1].AsCalc();
}
else
{
color = arguments[i].AsColor();
}
if (color == null || location == null)
{
return(null);
}
stops[k] = new CSSImageValue.GradientStop(color.Value, location);
}
return(CSSImageValue.FromLinearGradient(direction, repeating, stops));
}
}
return(null);
}
public static CSSImageValue AsImage(this CSSValue value)
{
if (value is CSSImageValue)
{
return((CSSImageValue)value);
}
else if (value is CSSPrimitiveValue <Location> )
{
return(CSSImageValue.FromUrl(((CSSPrimitiveValue <Location>)value).Value));
}
else if (value.Is("none"))
{
return(CSSImageValue.None);
}
return(null);
}