UnrealEngineUWP/Engine/Source/Editor/BlueprintGraph/Private/K2Node_MakeStruct.cpp

// Copyright 1998-2014 Epic Games, Inc. All Rights Reserved.

#include "BlueprintGraphPrivatePCH.h"
#include "KismetCompiler.h"
#include "Editor/UnrealEd/Public/Kismet2/StructureEditorUtils.h"

#define LOCTEXT_NAMESPACE "K2Node_MakeStruct"

//////////////////////////////////////////////////////////////////////////
// FKCHandler_MakeStruct

class FKCHandler_MakeStruct : public FNodeHandlingFunctor
{
public:
	UEdGraphPin* FindOutputStructPinChecked(UEdGraphNode* Node)
	{
		check(NULL != Node);
		UEdGraphPin* OutputPin = NULL;
		for (int32 PinIndex = 0; PinIndex < Node->Pins.Num(); ++PinIndex)
		{
			UEdGraphPin* Pin = Node->Pins[PinIndex];
			if (Pin && (EGPD_Output == Pin->Direction) && !CompilerContext.GetSchema()->IsMetaPin(*Pin))
			{
				OutputPin = Pin;
				break;
			}
		}
		check(NULL != OutputPin);
		return OutputPin;
	}

	FKCHandler_MakeStruct(FKismetCompilerContext& InCompilerContext)
		: FNodeHandlingFunctor(InCompilerContext)
	{
	}

	virtual void RegisterNets(FKismetFunctionContext& Context, UEdGraphNode* InNode) OVERRIDE
	{
		UK2Node_MakeStruct* Node = CastChecked<UK2Node_MakeStruct>(InNode);
		if (NULL == Node->StructType)
		{
			CompilerContext.MessageLog.Error(*LOCTEXT("MakeStruct_UnknownStructure_Error", "Unknown structure to break for @@").ToString(), Node);
			return;
		}

		if(!UK2Node_MakeStruct::CanBeMade(Node->StructType))
		{
			CompilerContext.MessageLog.Warning(*LOCTEXT("MakeStruct_Error", "The structure contains read-only members @@. Try use specialized 'make' function if available. ").ToString(), Node);
		}

		FNodeHandlingFunctor::RegisterNets(Context, Node);

		UEdGraphPin* OutputPin = FindOutputStructPinChecked(Node);
		UEdGraphPin* Net = FEdGraphUtilities::GetNetFromPin(OutputPin);
		check(NULL != Net);
		FBPTerminal** FoundTerm = Context.NetMap.Find(Net);
		FBPTerminal* Term = FoundTerm ? *FoundTerm : NULL;
		check(NULL != Term);

		UStruct* StructInTerm = Cast<UStruct>(Term->Type.PinSubCategoryObject.Get());
		if (NULL == StructInTerm || !StructInTerm->IsChildOf(Node->StructType))
		{
			CompilerContext.MessageLog.Error(*LOCTEXT("MakeStruct_NoMatch_Error", "Structures don't match for @@").ToString(), Node);
		}
	}

	virtual void RegisterNet(FKismetFunctionContext& Context, UEdGraphPin* Net) OVERRIDE
	{
		FBPTerminal* Term = new (Context.IsEventGraph() ? Context.EventGraphLocals : Context.Locals) FBPTerminal();
		Term->CopyFromPin(Net, Context.NetNameMap->MakeValidName(Net));
		Context.NetMap.Add(Net, Term);
	}

	virtual void Compile(FKismetFunctionContext& Context, UEdGraphNode* InNode) OVERRIDE
	{
		UK2Node_MakeStruct* Node = CastChecked<UK2Node_MakeStruct>(InNode);
		if (NULL == Node->StructType)
		{
			CompilerContext.MessageLog.Error(*LOCTEXT("MakeStruct_UnknownStructure_Error", "Unknown structure to break for @@").ToString(), Node);
			return;
		}

		UEdGraphPin* OutputStructNet = FEdGraphUtilities::GetNetFromPin(FindOutputStructPinChecked(Node));
		FBPTerminal** FoundTerm = Context.NetMap.Find(OutputStructNet);
		FBPTerminal* OutputStructTerm = FoundTerm ? *FoundTerm : NULL;
		check(NULL != OutputStructTerm);

		for (int32 PinIndex = 0; PinIndex < Node->Pins.Num(); ++PinIndex)
		{
			UEdGraphPin* Pin = Node->Pins[PinIndex];
			if (Pin && !CompilerContext.GetSchema()->IsMetaPin(*Pin) && (Pin->Direction == EGPD_Input))
			{
				FBPTerminal** FoundSrcTerm = Context.NetMap.Find(FEdGraphUtilities::GetNetFromPin(Pin));
				FBPTerminal* SrcTerm = FoundSrcTerm ? *FoundSrcTerm : NULL;
				check(NULL != SrcTerm);

				UProperty* BoundProperty = FindField<UProperty>(Node->StructType, *(Pin->PinName));
				check(NULL != BoundProperty);

				FBPTerminal* DstTerm = new (Context.IsEventGraph() ? Context.EventGraphLocals : Context.Locals) FBPTerminal();
				DstTerm->CopyFromPin(Pin, Context.NetNameMap->MakeValidName(Pin));
				DstTerm->AssociatedVarProperty = BoundProperty;
				DstTerm->Context = OutputStructTerm;

				FBlueprintCompiledStatement& Statement = Context.AppendStatementForNode(Node);
				Statement.Type = KCST_Assignment;
				Statement.LHS = DstTerm;
				Statement.RHS.Add(SrcTerm);
			}
		}
		if(!Node->IsNodePure())
		{
			GenerateSimpleThenGoto(Context, *Node);
		}
	}
};

//////////////////////////////////////////////////////////////////////////
// UK2Node_MakeStruct


UK2Node_MakeStruct::FMakeStructPinManager::FMakeStructPinManager(const uint8* InSampleStructMemory)
	: FStructOperationOptionalPinManager(), SampleStructMemory(InSampleStructMemory)
{
}

void UK2Node_MakeStruct::FMakeStructPinManager::CustomizePinData(UEdGraphPin* Pin, FName SourcePropertyName, int32 ArrayIndex, UProperty* Property) const
{
	struct FPinDefaultValueHelper
	{
		static void Set(UEdGraphPin& InPin, const FString& Value, bool bIsText)
		{
			InPin.AutogeneratedDefaultValue = Value;
			if (bIsText)
			{
				InPin.DefaultTextValue = FText::FromString(Value);
			}
			else
			{
				InPin.DefaultValue = Value;
			}
		}
	};

	UK2Node_StructOperation::FStructOperationOptionalPinManager::CustomizePinData(Pin, SourcePropertyName, ArrayIndex, Property);
	if (Pin && Property)
	{
		const UEdGraphSchema_K2* Schema = GetDefault<UEdGraphSchema_K2>();
		check(Schema);
		const bool bIsText = Property->IsA<UTextProperty>();
		checkSlow(bIsText == (Schema->PC_Text == Pin->PinType.PinCategory));

		const FString& MetadataDefaultValue = Property->GetMetaData(TEXT("MakeStructureDefaultValue"));
		if (!MetadataDefaultValue.IsEmpty())
		{
			FPinDefaultValueHelper::Set(*Pin, MetadataDefaultValue, bIsText);
			return;
		}

		if (NULL != SampleStructMemory)
		{
			FString NewDefaultValue;
			if (Property->ExportText_InContainer(0, NewDefaultValue, SampleStructMemory, SampleStructMemory, NULL, PPF_None))
			{
				if (Schema->IsPinDefaultValid(Pin, NewDefaultValue, NULL, FText::GetEmpty()).IsEmpty())
				{
					FPinDefaultValueHelper::Set(*Pin, NewDefaultValue, bIsText);
					return;
				}
			}
		}

		Schema->SetPinDefaultValueBasedOnType(Pin);
	}
}

bool UK2Node_MakeStruct::FMakeStructPinManager::CanTreatPropertyAsOptional(UProperty* TestProperty) const
{
	return UK2Node_MakeStruct::CanBeExposed(TestProperty);
}

UK2Node_MakeStruct::UK2Node_MakeStruct(const class FPostConstructInitializeProperties& PCIP)
	: Super(PCIP)
{
}

void UK2Node_MakeStruct::AllocateDefaultPins()
{
	const UEdGraphSchema_K2* Schema = GetDefault<UEdGraphSchema_K2>();
	if(Schema && StructType)
	{
		CreatePin(EGPD_Output, Schema->PC_Struct, TEXT(""), StructType, false, false, StructType->GetName());
		
		{
			FStructOnScope StructOnScope(Cast<UScriptStruct>(StructType));
			FMakeStructPinManager OptionalPinManager(StructOnScope.GetStructMemory());
			OptionalPinManager.RebuildPropertyList(ShowPinForProperties, StructType);
			OptionalPinManager.CreateVisiblePins(ShowPinForProperties, StructType, EGPD_Input, this);
		}

		// When struct has a lot of fields, mark their pins as advanced
		if(Pins.Num() > 5)
		{
			if(ENodeAdvancedPins::NoPins == AdvancedPinDisplay)
			{
				AdvancedPinDisplay = ENodeAdvancedPins::Hidden;
			}

			for(int32 PinIndex = 3; PinIndex < Pins.Num(); ++PinIndex)
			{
				if(UEdGraphPin * EdGraphPin = Pins[PinIndex])
				{
					EdGraphPin->bAdvancedView = true;
				}
			}
		}
	}
}

void UK2Node_MakeStruct::ValidateNodeDuringCompilation(class FCompilerResultsLog& MessageLog) const
{
	if(!StructType)
	{
		MessageLog.Error(*LOCTEXT("NoStruct_Error", "No Struct in @@").ToString(), this);
	}
}


FText UK2Node_MakeStruct::GetNodeTitle(ENodeTitleType::Type TitleType) const 
{
	FFormatNamedArguments Args;
	Args.Add(TEXT("StructName"), FText::FromString(StructType ? StructType->GetName() : FString()));
	return FText::Format(LOCTEXT("MakeNodeTitle", "Make {StructName}"), Args);
}

FString UK2Node_MakeStruct::GetNodeNativeTitle(ENodeTitleType::Type TitleType) const 
{
	// Do not setup this function for localization, intentionally left unlocalized!
	
	return FString(TEXT("Make ")) + (StructType ? StructType->GetName() : FString());
}

FString UK2Node_MakeStruct::GetTooltip() const
{
	return FString::Printf(
		*LOCTEXT("MakeStruct_Tooltip", "Adds a node that create a '%s' from its members").ToString(),
		*(StructType ? StructType->GetName() : FString())
		);
}

FLinearColor UK2Node_MakeStruct::GetNodeTitleColor() const
{
	if(const UEdGraphSchema_K2* K2Schema = GetDefault<UEdGraphSchema_K2>())
	{
		FEdGraphPinType PinType;
		PinType.PinCategory = K2Schema->PC_Struct;
		PinType.PinSubCategoryObject = StructType;
		return K2Schema->GetPinTypeColor(PinType);
	}
	return UK2Node::GetNodeTitleColor();
}

bool UK2Node_MakeStruct::CanBeExposed(const UProperty* Property)
{
	if(Property)
	{
		const UEdGraphSchema_K2* Schema = GetDefault<UEdGraphSchema_K2>();
		check(Schema);

		FEdGraphPinType DumbGraphPinType;
		const bool bConvertable = Schema->ConvertPropertyToPinType(Property, /*out*/ DumbGraphPinType);
		const bool bVisible = Property->HasAnyPropertyFlags(CPF_BlueprintVisible|CPF_Edit);
		const bool bBlueprintReadOnly = Property->HasAllPropertyFlags(CPF_BlueprintReadOnly);
		if(bVisible && bConvertable && !bBlueprintReadOnly)
		{
			return true;
		}
	}
	return false;
}

bool UK2Node_MakeStruct::CanBeMade(const UScriptStruct* Struct)
{
	if(!Struct->GetBoolMetaData(TEXT("HasNativeMakeBreak")))
	{
		for (TFieldIterator<UProperty> It(Struct); It; ++It)
		{
			if(CanBeExposed(*It))
			{
				return true;
			}
		}
	}
	return false;
}

FNodeHandlingFunctor* UK2Node_MakeStruct::CreateNodeHandler(FKismetCompilerContext& CompilerContext) const
{
	return new FKCHandler_MakeStruct(CompilerContext);
}

UK2Node::ERedirectType UK2Node_MakeStruct::DoPinsMatchForReconstruction(const UEdGraphPin* NewPin, int32 NewPinIndex, const UEdGraphPin* OldPin, int32 OldPinIndex)  const
{
	ERedirectType Result = UK2Node::DoPinsMatchForReconstruction(NewPin, NewPinIndex, OldPin, OldPinIndex);
	if ((ERedirectType_None == Result) && DoRenamedPinsMatch(NewPin, OldPin, false))
	{
		Result = ERedirectType_Custom;
	}
	return Result;
}

#undef LOCTEXT_NAMESPACE