/// <summary>
/// Determines if the given value represents a valid state of this property.
/// </summary>
/// <param name="value">The state that should be used.</param>
/// <returns>True if the state is valid, otherwise false.</returns>
protected override Boolean IsValid(CSSValue value)
{
var mode = value.ToDecorationLine();
if (mode.HasValue)
{
_line.Clear();
_line.Add(mode.Value);
}
else if (value.Is(Keywords.None))
{
_line.Clear();
}
else if (value is CSSValueList)
{
var values = (CSSValueList)value;
var list = new List <TextDecorationLine>();
foreach (var item in values)
{
mode = item.ToDecorationLine();
if (mode == null)
{
return(false);
}
list.Add(mode.Value);
}
_line = list;
}
else
{
return(false);
}
return(true);
}