private bool IsValidRequirement(RequiredComponentAttribute attrib)
{
Type reqType = attrib.RequiredComponentType;
TypeInfo reqTypeInfo = reqType.GetTypeInfo();
// Ignore requirements to non-exported / internal types, as
// Duality will ignore them as well.
if (reqTypeInfo.IsNotPublic)
{
return(false);
}
// Ignore requirements to non-Components
TypeInfo componentTypeInfo = typeof(Component).GetTypeInfo();
if (!reqTypeInfo.IsInterface && !componentTypeInfo.IsAssignableFrom(reqTypeInfo))
{
return(false);
}
return(true);
}
private void AddCreationChainElements(ComponentRequirementMap map, RequiredComponentAttribute attrib, Type subChainType)
{
if (subChainType == this.Component)
{
return;
}
int baseIndex = this.CreationChain.Count;
int subChainLength = 0;
// Retrieve the creation sub-chain to satisfy this item's requirements
List <CreationChainItem> createTypeSubChain = map.GetCreationChain(subChainType);
foreach (CreationChainItem subItem in createTypeSubChain)
{
this.CreationChain.Add(subItem);
subChainLength++;
}
// Add the main item after its requirement items so we're always creating bottom-up
this.CreationChain.Add(new CreationChainItem
{
RequiredType = attrib.RequiredComponentType,
CreateType = attrib.CreateDefaultType
});
// If this is a conditional requirement, add a control item that checks the
// requirement and skips this item and its sub-chains if it's already met.
if (subChainLength > 0 && attrib.CreateDefaultType != attrib.RequiredComponentType)
{
this.CreationChain.Insert(baseIndex, new CreationChainItem
{
RequiredType = attrib.RequiredComponentType,
SkipIfExists = 1 + subChainLength
});
}
}