/// <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.ToBorderRepeat();
if (mode != null)
{
_horizontal = _vertical = mode.Value;
}
else if (value is CSSValueList)
{
var list = (CSSValueList)value;
BorderRepeat?horizontal = null;
BorderRepeat?vertical = null;
if (list.Length > 2)
{
return(false);
}
foreach (var entry in list)
{
mode = entry.ToBorderRepeat();
if (mode == null)
{
return(false);
}
else if (horizontal == null)
{
horizontal = mode;
}
else
{
vertical = mode;
}
}
_horizontal = horizontal.Value;
_vertical = vertical.Value;
}
else
{
return(false);
}
return(true);
}