UEdGraphNode* FMaterialGraphSchemaAction_NewFunctionCall::PerformAction(class UEdGraph* ParentGraph, UEdGraphPin* FromPin, const FVector2D Location, bool bSelectNewNode/* = true*/)
{
const FScopedTransaction Transaction(NSLOCTEXT("UnrealEd", "MaterialEditorNewFunctionCall", "Material Editor: New Function Call"));
UMaterialExpressionMaterialFunctionCall* FunctionNode = CastChecked<UMaterialExpressionMaterialFunctionCall>(
FMaterialEditorUtilities::CreateNewMaterialExpression(
ParentGraph, UMaterialExpressionMaterialFunctionCall::StaticClass(), Location, bSelectNewNode, /*bAutoAssignResource*/false));
if (!FunctionNode->MaterialFunction)
{
UMaterialFunction* MaterialFunction = LoadObject<UMaterialFunction>(NULL, *FunctionPath, NULL, 0, NULL);
UMaterialGraph* MaterialGraph = CastChecked<UMaterialGraph>(ParentGraph);
if(FunctionNode->SetMaterialFunction(MaterialGraph->MaterialFunction, NULL, MaterialFunction))
{
FunctionNode->PostEditChange();
FMaterialEditorUtilities::UpdateSearchResults(ParentGraph);
FunctionNode->GraphNode->AutowireNewNode(FromPin);
return FunctionNode->GraphNode;
}
else
{
FMaterialEditorUtilities::AddToSelection(ParentGraph, FunctionNode);
FMaterialEditorUtilities::DeleteSelectedNodes(ParentGraph);
}
}
return NULL;
}
void UMaterialGraphSchema::DroppedAssetsOnGraph(const TArray<class FAssetData>& Assets, const FVector2D& GraphPosition, UEdGraph* Graph) const
{
UMaterialGraph* MaterialGraph = CastChecked<UMaterialGraph>(Graph);
const int32 LocOffsetBetweenNodes = 32;
FVector2D ExpressionPosition = GraphPosition;
for (int32 AssetIdx = 0; AssetIdx < Assets.Num(); ++AssetIdx)
{
bool bAddedNode = false;
UObject* Asset = Assets[AssetIdx].GetAsset();
UClass* MaterialExpressionClass = Cast<UClass>(Asset);
UMaterialFunction* Func = Cast<UMaterialFunction>(Asset);
UTexture* Tex = Cast<UTexture>(Asset);
UMaterialParameterCollection* ParameterCollection = Cast<UMaterialParameterCollection>(Asset);
if (MaterialExpressionClass && MaterialExpressionClass->IsChildOf(UMaterialExpression::StaticClass()))
{
FMaterialEditorUtilities::CreateNewMaterialExpression(Graph, MaterialExpressionClass, ExpressionPosition, true, true);
bAddedNode = true;
}
else if ( Func )
{
UMaterialExpressionMaterialFunctionCall* FunctionNode = CastChecked<UMaterialExpressionMaterialFunctionCall>(
FMaterialEditorUtilities::CreateNewMaterialExpression(Graph, UMaterialExpressionMaterialFunctionCall::StaticClass(), ExpressionPosition, true, false));
if (!FunctionNode->MaterialFunction)
{
if(FunctionNode->SetMaterialFunction(MaterialGraph->MaterialFunction, NULL, Func))
{
FunctionNode->PostEditChange();
FMaterialEditorUtilities::UpdateSearchResults(Graph);
}
else
{
FMaterialEditorUtilities::AddToSelection(Graph, FunctionNode);
FMaterialEditorUtilities::DeleteSelectedNodes(Graph);
continue;
}
}
bAddedNode = true;
}
else if ( Tex )
{
UMaterialExpressionTextureSample* TextureSampleNode = CastChecked<UMaterialExpressionTextureSample>(
FMaterialEditorUtilities::CreateNewMaterialExpression(Graph, UMaterialExpressionTextureSample::StaticClass(), ExpressionPosition, true, true) );
TextureSampleNode->Texture = Tex;
TextureSampleNode->AutoSetSampleType();
FMaterialEditorUtilities::ForceRefreshExpressionPreviews(Graph);
bAddedNode = true;
}
else if ( ParameterCollection )
{
UMaterialExpressionCollectionParameter* CollectionParameterNode = CastChecked<UMaterialExpressionCollectionParameter>(
FMaterialEditorUtilities::CreateNewMaterialExpression(Graph, UMaterialExpressionCollectionParameter::StaticClass(), ExpressionPosition, true, true) );
CollectionParameterNode->Collection = ParameterCollection;
FMaterialEditorUtilities::ForceRefreshExpressionPreviews(Graph);
bAddedNode = true;
}
if ( bAddedNode )
{
ExpressionPosition.X += LocOffsetBetweenNodes;
ExpressionPosition.Y += LocOffsetBetweenNodes;
}
}
}