bool UMaterialGraphNode::CanPasteHere(const UEdGraph* TargetGraph, const UEdGraphSchema* Schema) const
{
if (Super::CanPasteHere(TargetGraph, Schema))
{
const UMaterialGraph* MaterialGraph = Cast<const UMaterialGraph>(TargetGraph);
if (MaterialGraph)
{
// Check whether we're trying to paste a material function into a function that depends on it
UMaterialExpressionMaterialFunctionCall* FunctionExpression = Cast<UMaterialExpressionMaterialFunctionCall>(MaterialExpression);
bool bIsValidFunctionExpression = true;
if (MaterialGraph->MaterialFunction
&& FunctionExpression
&& FunctionExpression->MaterialFunction
&& FunctionExpression->MaterialFunction->IsDependent(MaterialGraph->MaterialFunction))
{
bIsValidFunctionExpression = false;
}
if (bIsValidFunctionExpression && IsAllowedExpressionType(MaterialExpression->GetClass(), MaterialGraph->MaterialFunction != NULL))
{
return true;
}
}
}
return false;
}
void FMaterialEditorUtilities::AddMaterialExpressionCategory(FGraphActionMenuBuilder& ActionMenuBuilder, FString CategoryName, TArray<struct FMaterialExpression>* MaterialExpressions, bool bMaterialFunction)
{
// Get type of dragged pin
uint32 FromPinType = 0;
if (ActionMenuBuilder.FromPin)
{
FromPinType = UMaterialGraphSchema::GetMaterialValueType(ActionMenuBuilder.FromPin);
}
for (int32 Index = 0; Index < MaterialExpressions->Num(); ++Index)
{
const FMaterialExpression& MaterialExpression = (*MaterialExpressions)[Index];
if (IsAllowedExpressionType(MaterialExpression.MaterialClass, bMaterialFunction))
{
if (!ActionMenuBuilder.FromPin || HasCompatibleConnection(MaterialExpression.MaterialClass, FromPinType, ActionMenuBuilder.FromPin->Direction, bMaterialFunction))
{
FFormatNamedArguments Arguments;
Arguments.Add(TEXT("Name"), FText::FromString( *MaterialExpression.Name ));
const FText ToolTip = FText::Format( LOCTEXT( "NewMaterialExpressionTooltip", "Adds a {Name} node here" ), Arguments );
TSharedPtr<FMaterialGraphSchemaAction_NewNode> NewNodeAction(new FMaterialGraphSchemaAction_NewNode(
CategoryName,
FText::FromString(MaterialExpression.Name),
ToolTip.ToString(), 0));
ActionMenuBuilder.AddAction(NewNodeAction);
NewNodeAction->MaterialExpressionClass = MaterialExpression.MaterialClass;
NewNodeAction->Keywords = CastChecked<UMaterialExpression>(MaterialExpression.MaterialClass->GetDefaultObject())->GetKeywords();
}
}
}
}
