/// <summary>
/// Semantically equivilent to Freezable.Clone().Freeze() except that
/// GetAsFrozen avoids copying any portions of the Freezable graph
/// which are already frozen.
/// </summary>
public static Freezable GetAsFrozen(Freezable freezable)
{
if (freezable == null)
{
return(null);
}
return(freezable.GetAsFrozen());
}
/// <summary>
/// Stores a frozen copy of defaultValue
/// </summary>
internal FreezableDefaultValueFactory(Freezable defaultValue)
{
Debug.Assert(defaultValue != null,
"Null can not be made mutable. Do not use FreezableDefaultValueFactory.");
Debug.Assert(defaultValue.CanFreeze,
"The defaultValue prototype must be freezable.");
_defaultValuePrototype = defaultValue.GetAsFrozen();
}
object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
Freezable fvalue = value as Freezable;
if (fvalue == null)
{
return(fvalue);
}
return(fvalue.CanFreeze ? fvalue.Clone() : fvalue.GetAsFrozen());
}
/// <summary>
/// If freezable is already frozen, it returns freezable
/// If freezable is not frozen, it returns a copy that is frozen if possible
/// </summary>
internal static Freezable GetAsFrozenIfPossible(Freezable freezable)
{
if (freezable == null)
{
return(null);
}
if (freezable.CanFreeze)
{
freezable = freezable.GetAsFrozen();
}
return(freezable);
}
