// <summary>
// Gets all relevant sub-properties from the value of the specified
// ModelProperty
// </summary>
// <param name="property">ModelProperty to examine</param>
// <returns>Sub-properties exposed by the value of the specified ModelProperty</returns>
public static List <ModelProperty> GetSubProperties(ModelProperty property)
{
if (property.Value == null || ModelUtilities.GetSafeRawValue(property) == null)
{
return(null);
}
// First, see if there is a custom TypeConverter. If so, get the subProperties
// from there. Otherwise, get all subProperties including those that aren't browsable,
// since the Browsability call should be made by the UI, not by the model.
return(GetTypeConverterSubProperties(property) ?? GetAllSubProperties(property));
}
// <summary>
// Computes the IsReadOnly flag for the specified set of properties, ORing
// results together for sets of properties larger than 1.
// </summary>
// <param name="properties">Properties to examine</param>
// <param name="isMixedValueDelegate">Delegate that evaluates the IsMixedValue flag for
// the passed in property values (added as an optimization, since we don't always require
// the value and it may be computationally expensive)</param>
// <returns>Flag indicating whether the set of properties is read only or not</returns>
public static bool IsReadOnly(List <ModelProperty> properties, IsMixedValueEvaluator isMixedValueEvaluator)
{
if (properties == null || properties.Count == 0)
{
Debug.Fail("ExtensibilityAccessor.IsReadOnly: No properties specified.");
return(true);
}
Type propertyType = properties[0].PropertyType;
// ILists are readonly only if value is null
if (typeof(IList).IsAssignableFrom(propertyType))
{
if (OrReadOnlyValues(properties))
{
IList list = null;
if (isMixedValueEvaluator != null)
{
list = isMixedValueEvaluator() ? null : (ModelUtilities.GetSafeRawValue(properties[0]) as IList);
}
else
{
Debug.Fail("No delegate to evaluate IsMixedValue specified.");
}
if (list == null)
{
return(true);
}
}
return(false);
}
// Arrays and ICollections are readonly
if (typeof(Array).IsAssignableFrom(propertyType) || typeof(ICollection).IsAssignableFrom(propertyType))
{
return(true);
}
// Types that implement ONLY ICollection<> or ONLY IList<> (meaning they
// don't also implement ICollection or IList, which we handle above)
// are also readonly
if (ModelUtilities.ImplementsICollection(propertyType) || ModelUtilities.ImplementsIList(propertyType))
{
return(true);
}
// Otherwise, go off of the IsReadOnly value in ModelProperty
return(OrReadOnlyValues(properties));
}
