bool FStructureEditorUtils::ChangeVariableDefaultValue(UUserDefinedStruct* Struct, FGuid VarGuid, const FString& NewDefaultValue)
{
auto ValidateDefaultValue = [](const FStructVariableDescription& VarDesc, const FString& InNewDefaultValue) -> bool
{
const UEdGraphSchema_K2* K2Schema = GetDefault<UEdGraphSchema_K2>();
const FEdGraphPinType PinType = VarDesc.ToPinType();
bool bResult = false;
//TODO: validation for values, that are not passed by string
if (PinType.PinCategory == K2Schema->PC_Text)
{
bResult = true;
}
else if ((PinType.PinCategory == K2Schema->PC_Object)
|| (PinType.PinCategory == K2Schema->PC_Interface)
|| (PinType.PinCategory == K2Schema->PC_Class)
|| (PinType.PinCategory == K2Schema->PC_AssetClass)
|| (PinType.PinCategory == K2Schema->PC_Asset))
{
// K2Schema->DefaultValueSimpleValidation finds an object, passed by path, invalid
bResult = true;
}
else
{
bResult = K2Schema->DefaultValueSimpleValidation(PinType, FString(), InNewDefaultValue, NULL, FText::GetEmpty());
}
return bResult;
};
auto VarDesc = GetVarDescByGuid(Struct, VarGuid);
if (VarDesc
&& (NewDefaultValue != VarDesc->DefaultValue)
&& ValidateDefaultValue(*VarDesc, NewDefaultValue))
{
bool bAdvancedValidation = true;
if (!NewDefaultValue.IsEmpty())
{
const auto Property = FindField<UProperty>(Struct, VarDesc->VarName);
FStructOnScope StructDefaultMem(Struct);
bAdvancedValidation = StructDefaultMem.IsValid() && Property &&
FBlueprintEditorUtils::PropertyValueFromString(Property, NewDefaultValue, StructDefaultMem.GetStructMemory());
}
if (bAdvancedValidation)
{
const FScopedTransaction Transaction(LOCTEXT("ChangeVariableDefaultValue", "Change Variable Default Value"));
TGuardValue<FStructureEditorUtils::EStructureEditorChangeInfo> ActiveChangeGuard(FStructureEditorUtils::FStructEditorManager::ActiveChange, EStructureEditorChangeInfo::DefaultValueChanged);
ModifyStructData(Struct);
VarDesc->DefaultValue = NewDefaultValue;
OnStructureChanged(Struct, EStructureEditorChangeInfo::DefaultValueChanged);
return true;
}
}
return false;
}
void UUserDefinedStruct::SerializeTaggedProperties(FArchive& Ar, uint8* Data, UStruct* DefaultsStruct, uint8* Defaults, const UObject* BreakRecursionIfFullyLoad) const
{
#if WITH_EDITOR
/* The following code is responsible for UUserDefinedStruct's default values serialization. */
auto UDDefaultsStruct = Cast<UUserDefinedStruct>(DefaultsStruct);
const bool bDuplicate = (0 != (Ar.GetPortFlags() & PPF_Duplicate));
/* When saving delta, we want the difference between current data and true structure's default values.
When Defaults is NULL then zeroed data will be used for comparison.*/
const bool bUseNewDefaults = !Defaults
&& UDDefaultsStruct
&& Ar.DoDelta()
&& Ar.IsSaving()
&& !bDuplicate
&& !Ar.IsCooking();
/* Object serialized from delta will have missing properties filled with zeroed data,
we want structure's default data instead */
const bool bLoadDefaultFirst = UDDefaultsStruct
&& !bDuplicate
&& Ar.IsLoading();
const bool bPrepareDefaultStruct = bUseNewDefaults || bLoadDefaultFirst;
FStructOnScope StructDefaultMem(bPrepareDefaultStruct ? UDDefaultsStruct : NULL);
if (bPrepareDefaultStruct)
{
FStructureEditorUtils::Fill_MakeStructureDefaultValue(UDDefaultsStruct, StructDefaultMem.GetStructMemory());
}
if (bUseNewDefaults)
{
Defaults = StructDefaultMem.GetStructMemory();
}
if (bLoadDefaultFirst)
{
if (Defaults == nullptr)
{
Defaults = StructDefaultMem.GetStructMemory();
}
UDDefaultsStruct->CopyScriptStruct(Data, Defaults);
}
#endif // WITH_EDITOR
Super::SerializeTaggedProperties(Ar, Data, DefaultsStruct, Defaults);
}
