/// <summary>
/// Filters font family values
/// </summary>
/// <param name="Property"></param>
/// <returns></returns>
public static CssValueList Font_Family_Used(ICssProperty Property)
{
if (Property == null)
{
throw new ArgumentNullException(nameof(Property));
}
Contract.EndContractBlock();
#if DISABLE_FONT_SYSTEM
return(null);
#else
CssValueList curValues = (Property as CssMultiValueProperty).Computed;
List <CssValue> retValues = new List <CssValue>();
foreach (CssValue val in curValues)
{
switch (val.Type)
{
case ECssValueType.KEYWORD:
{ // Replace generic font-family keywords with a list of our fallback font-familys for that family
var familyKeyword = val.AsEnum <EGenericFontFamily>();
switch (familyKeyword)
{
case EGenericFontFamily.Serif:
case EGenericFontFamily.SansSerif:
case EGenericFontFamily.Monospace:
case EGenericFontFamily.Cursive:
case EGenericFontFamily.Fantasy:
{
if (FontManager.GenericFamilyMap.TryGetValue(outFamily, out List <CssValue> GenericFontFamilys))
{
retValues.AddRange(GenericFontFamilys);
}
}
break;
default:
throw new NotImplementedException($"Unknown font-family keyword '{val.Value.ToString()}'");
}
}
break;
case ECssValueType.STRING:
{ // Remove any invalid font-familys
foreach (FontFamily family in SystemFonts.Families)
{
if (0 == Unicode.CaselessCompare(val.AsString, family.Name))
{ // Found it!
retValues.Add(val);
break;
}
}
}
break;
default:
{
retValues.Add(val);
}
break;
}
}
return((retValues.Count > 0) ? new CssValueList(retValues) : null);
#endif
}