UnrealEngineUWP/Engine/Source/Editor/NiagaraEditor/Private/ViewModels/NiagaraScriptParameterViewModel.cpp

// Copyright 1998-2016 Epic Games, Inc. All Rights Reserved.

#include "NiagaraScriptParameterViewModel.h"
#include "NiagaraEditorUtilities.h"
#include "NiagaraTypes.h"

#include "ScopedTransaction.h"
#include "Editor.h"

#define LOCTEXT_NAMESPACE "ScriptParameterViewModel"

FNiagaraScriptParameterViewModel::FNiagaraScriptParameterViewModel(FNiagaraVariable& InGraphVariable, UObject& InGraphVariableOwner, FNiagaraVariable* InCompiledVariable, UObject* InCompiledVariableOwner, ENiagaraParameterEditMode ParameterEditMode)
	: FNiagaraParameterViewModel(ParameterEditMode)
	, GraphVariable(InGraphVariable)
	, GraphVariableOwner(InGraphVariableOwner)
	, CompiledVariable(InCompiledVariable)
	, CompiledVariableOwner(InCompiledVariableOwner)
	, ValueObject(nullptr)
{
	bool bUsingCompiledVariable = InCompiledVariable != nullptr;
	checkf(bUsingCompiledVariable == false || InCompiledVariableOwner != nullptr, TEXT("When using a compiled variable, it's owner must not be null"));
	DefaultValueType = INiagaraParameterViewModel::EDefaultValueType::Struct;
	RefreshParameterValue();
}

FNiagaraScriptParameterViewModel::FNiagaraScriptParameterViewModel(FNiagaraVariable& InGraphVariable, UObject& InGraphVariableOwner, UObject* InValueObject, ENiagaraParameterEditMode ParameterEditMode)
	: FNiagaraParameterViewModel(ParameterEditMode)
	, GraphVariable(InGraphVariable)
	, GraphVariableOwner(InGraphVariableOwner)
	, CompiledVariable(nullptr)
	, CompiledVariableOwner(nullptr)
	, ValueObject(InValueObject)
{
	DefaultValueType = INiagaraParameterViewModel::EDefaultValueType::Object;
}

FGuid FNiagaraScriptParameterViewModel::GetId() const
{
	return GraphVariable.GetId();
}

FName FNiagaraScriptParameterViewModel::GetName() const
{
	return GraphVariable.GetName();
}

FText FNiagaraScriptParameterViewModel::GetTypeDisplayName() const
{
	return FText::Format(LOCTEXT("TypeTextFormat", "Type: {0}"), GraphVariable.GetType().GetStruct()->GetDisplayNameText());
}

void FNiagaraScriptParameterViewModel::NameTextComitted(const FText& Name, ETextCommit::Type CommitInfo)
{
	FName NewName = *Name.ToString();
	if (GraphVariable.GetName() != NewName)
	{
		FScopedTransaction ScopedTransaction(LOCTEXT("EditInputName", "Edit input name"));
		GraphVariableOwner.Modify();
		GraphVariable.SetName(NewName);
		OnNameChangedDelegate.Broadcast();
	}
}

TSharedPtr<FNiagaraTypeDefinition> FNiagaraScriptParameterViewModel::GetType() const
{
	return MakeShareable(new FNiagaraTypeDefinition(GraphVariable.GetType()));
}

void FNiagaraScriptParameterViewModel::SelectedTypeChanged(TSharedPtr<FNiagaraTypeDefinition> Item, ESelectInfo::Type SelectionType)
{
	if (Item.IsValid() && GraphVariable.GetType() != *Item)
	{
		FScopedTransaction ScopedTransaction(LOCTEXT("EditInputType", "Edit input type"));
		GraphVariableOwner.Modify();
		GraphVariable.SetType(*Item);
		FNiagaraEditorUtilities::ResetVariableToDefaultValue(GraphVariable);
		OnTypeChangedDelegate.Broadcast();
	}
}

INiagaraParameterViewModel::EDefaultValueType FNiagaraScriptParameterViewModel::GetDefaultValueType()
{
	return DefaultValueType;
}

TSharedRef<FStructOnScope> FNiagaraScriptParameterViewModel::GetDefaultValueStruct()
{
	return ParameterValue.ToSharedRef();
}

UObject* FNiagaraScriptParameterViewModel::GetDefaultValueObject()
{
	return ValueObject;
}

void FNiagaraScriptParameterViewModel::NotifyDefaultValuePropertyChanged(const FPropertyChangedEvent& PropertyChangedEvent)
{
	if (DefaultValueType == INiagaraParameterViewModel::EDefaultValueType::Struct)
	{
		FScopedTransaction ScopedTransaction(LOCTEXT("EditParameterValueProperty", "Edit parameter value"));
		ValueVariableOwner->Modify();
		ValueVariable->SetData(ParameterValue->GetStructMemory());
	}
	OnDefaultValueChangedDelegate.Broadcast(&GraphVariable);
}

void FNiagaraScriptParameterViewModel::NotifyBeginDefaultValueChange()
{
	GEditor->BeginTransaction(LOCTEXT("BeginEditParameterValue", "Edit parameter value"));
	ValueVariableOwner->Modify();
}

void FNiagaraScriptParameterViewModel::NotifyEndDefaultValueChange()
{
	if (GEditor->IsTransactionActive())
	{
		GEditor->EndTransaction();
	}
}

bool DataMatches(const uint8* DataA, const uint8* DataB, int32 Length)
{
	for (int32 i = 0; i < Length; ++i)
	{
		if (DataA[i] != DataB[i])
		{
			return false;
		}
	}
	return true;
}

void FNiagaraScriptParameterViewModel::NotifyDefaultValueChanged()
{
	if (ValueVariable->IsDataAllocated() == false ||
		DataMatches(ValueVariable->GetData(), ParameterValue->GetStructMemory(), ValueVariable->GetSizeInBytes()) == false)
	{
		FScopedTransaction ScopedTransaction(LOCTEXT("EditParameterValue", "Edit parameter value"));
		ValueVariableOwner->Modify();
		ValueVariable->SetData(ParameterValue->GetStructMemory());
		OnDefaultValueChangedDelegate.Broadcast(&GraphVariable);
	}
}

FNiagaraScriptParameterViewModel::FOnNameChanged& FNiagaraScriptParameterViewModel::OnNameChanged()
{
	return OnNameChangedDelegate;
}

void FNiagaraScriptParameterViewModel::RefreshParameterValue()
{
	if (CompiledVariable != nullptr && CompiledVariable->GetType().GetStruct() == GraphVariable.GetType().GetStruct())
	{
		// If the compiled variable is valid and the same type as the graph variable we will update that value to allow for changes to be
		// seen in the simulation without compiling.
		ValueVariable = CompiledVariable;
		ValueVariableOwner = CompiledVariableOwner;
	}
	else
	{
		// If the compiled variable is null or the type of the graph variable has been changed,
		// then we edit the value in the graph variable so that the value is of the correct type and can be edited.
		ValueVariable = &GraphVariable;
		ValueVariableOwner = &GraphVariableOwner;
	}
	ParameterValue = MakeShareable(new FStructOnScope(GraphVariable.GetType().GetStruct()));
	ValueVariable->AllocateData();
	ValueVariable->CopyTo(ParameterValue->GetStructMemory());
	OnDefaultValueChangedDelegate.Broadcast(&GraphVariable);
}

#undef LOCTEXT_NAMESPACE // "ScriptParameterViewModel"