UnrealEngineUWP/Engine/Plugins/Animation/ControlRig/Source/ControlRigEditor/Private/ControlRigGraphDetails.cpp

// Copyright Epic Games, Inc. All Rights Reserved.

#include "ControlRigGraphDetails.h"
#include "Widgets/SWidget.h"
#include "DetailLayoutBuilder.h"
#include "DetailCategoryBuilder.h"
#include "DetailWidgetRow.h"
#include "IDetailChildrenBuilder.h"
#include "EditorStyleSet.h"
#include "SPinTypeSelector.h"
#include "Widgets/Input/SButton.h"
#include "Widgets/Input/SCheckBox.h"
#include "Widgets/Text/STextBlock.h"
#include "Widgets/Colors/SColorPicker.h"
#include "Widgets/Text/SInlineEditableTextBlock.h"
#include "Widgets/Text/SMultiLineEditableText.h"
#include "PropertyCustomizationHelpers.h"
#include "NodeFactory.h"
#include "Graph/ControlRigGraphNode.h"
#include "ControlRig.h"
#include "RigVMCore/RigVMExternalVariable.h"
#include "Kismet2/BlueprintEditorUtils.h"
#include "Graph/ControlRigGraphSchema.h"
#include "EditorCategoryUtils.h"

#define LOCTEXT_NAMESPACE "ControlRigGraphDetails"

FControlRigArgumentGroupLayout::FControlRigArgumentGroupLayout(
	URigVMGraph* InGraph, 
	UControlRigBlueprint* InBlueprint, 
	bool bInputs)
	: GraphPtr(InGraph)
	, ControlRigBlueprintPtr(InBlueprint)
	, bIsInputGroup(bInputs)
{
	if (ControlRigBlueprintPtr.IsValid())
	{
		ControlRigBlueprintPtr.Get()->OnModified().AddRaw(this, &FControlRigArgumentGroupLayout::HandleModifiedEvent);
	}
}

FControlRigArgumentGroupLayout::~FControlRigArgumentGroupLayout()
{
	if (ControlRigBlueprintPtr.IsValid())
	{
		ControlRigBlueprintPtr.Get()->OnModified().RemoveAll(this);
	}
}

void FControlRigArgumentGroupLayout::GenerateChildContent(IDetailChildrenBuilder& ChildrenBuilder)
{
	bool WasContentAdded = false;
	if (GraphPtr.IsValid())
	{
		URigVMGraph* Graph = GraphPtr.Get();
		if (URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(Graph->GetOuter()))
		{
			for (URigVMPin* Pin : LibraryNode->GetPins())
			{
				if ((bIsInputGroup && (Pin->GetDirection() == ERigVMPinDirection::Input || Pin->GetDirection() == ERigVMPinDirection::IO)) ||
					(!bIsInputGroup && (Pin->GetDirection() == ERigVMPinDirection::Output || Pin->GetDirection() == ERigVMPinDirection::IO)))
				{
					TSharedRef<class FControlRigArgumentLayout> ControlRigArgumentLayout = MakeShareable(new FControlRigArgumentLayout(
						Pin,
						Graph,
						ControlRigBlueprintPtr.Get()
					));
					ChildrenBuilder.AddCustomBuilder(ControlRigArgumentLayout);
					WasContentAdded = true;
				}
			}
		}
	}
	if (!WasContentAdded)
	{
		// Add a text widget to let the user know to hit the + icon to add parameters.
		ChildrenBuilder.AddCustomRow(FText::GetEmpty()).WholeRowContent()
		.MaxDesiredWidth(980.f)
		[
			SNew(SHorizontalBox)
			+ SHorizontalBox::Slot()
			.VAlign(VAlign_Center)
			.Padding(0.0f, 0.0f, 4.0f, 0.0f)
			.AutoWidth()
			[
				SNew(STextBlock)
				.Text(LOCTEXT("NoArgumentsAddedForControlRig", "Please press the + icon above to add parameters"))
				.Font(IDetailLayoutBuilder::GetDetailFont())
			]
		];
	}
}

void FControlRigArgumentGroupLayout::HandleModifiedEvent(ERigVMGraphNotifType InNotifType, URigVMGraph* InGraph, UObject* InSubject)
{
	if (!GraphPtr.IsValid())
	{
		return;
	}
	
	URigVMGraph* Graph = GraphPtr.Get();
	URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(Graph->GetOuter());
	if (LibraryNode == nullptr)
	{
		return;
	}

	switch (InNotifType)
	{
		case ERigVMGraphNotifType::PinAdded:
		case ERigVMGraphNotifType::PinRemoved:
		case ERigVMGraphNotifType::PinIndexChanged:
		{
			URigVMPin* Pin = CastChecked<URigVMPin>(InSubject);
			if (Pin->GetNode() == LibraryNode)
			{
				OnRebuildChildren.ExecuteIfBound();
			}
			break;
		}
		default:
		{
			break;
		}
	}
}

void FControlRigArgumentLayout::GenerateHeaderRowContent(FDetailWidgetRow& NodeRow)
{
	const UEdGraphSchema* Schema = GetDefault<UControlRigGraphSchema>();

	ETypeTreeFilter TypeTreeFilter = ETypeTreeFilter::None;
	TypeTreeFilter |= ETypeTreeFilter::AllowExec;

	NodeRow
		.NameContent()
		[
			SNew(SHorizontalBox)
			+ SHorizontalBox::Slot()
			.FillWidth(1)
			.VAlign(VAlign_Center)
			[
				SAssignNew(ArgumentNameWidget, SEditableTextBox)
				.Text(this, &FControlRigArgumentLayout::OnGetArgNameText)
				.OnTextChanged(this, &FControlRigArgumentLayout::OnArgNameChange)
				.OnTextCommitted(this, &FControlRigArgumentLayout::OnArgNameTextCommitted)
				.ToolTipText(this, &FControlRigArgumentLayout::OnGetArgToolTipText)
				.Font(IDetailLayoutBuilder::GetDetailFont())
				.IsEnabled(!ShouldPinBeReadOnly())
			]
		]
		.ValueContent()
		.MaxDesiredWidth(980.f)
		[
			SNew(SHorizontalBox)
			+ SHorizontalBox::Slot()
			.VAlign(VAlign_Center)
			.Padding(0.0f, 0.0f, 4.0f, 0.0f)
			.AutoWidth()
			[
				SNew(SPinTypeSelector, FGetPinTypeTree::CreateUObject(GetDefault<UEdGraphSchema_K2>(), &UEdGraphSchema_K2::GetVariableTypeTree))
				.TargetPinType(this, &FControlRigArgumentLayout::OnGetPinInfo)
				.OnPinTypePreChanged(this, &FControlRigArgumentLayout::OnPrePinInfoChange)
				.OnPinTypeChanged(this, &FControlRigArgumentLayout::PinInfoChanged)
				.Schema(Schema)
				.TypeTreeFilter(TypeTreeFilter)
				.bAllowArrays(!ShouldPinBeReadOnly())
				.IsEnabled(!ShouldPinBeReadOnly(true))
				.Font(IDetailLayoutBuilder::GetDetailFont())
			]
			+ SHorizontalBox::Slot()
			.AutoWidth()
			[
				SNew(SButton)
				.ButtonStyle(FAppStyle::Get(), TEXT("SimpleButton"))
				.ContentPadding(0)
				.IsEnabled(!IsPinEditingReadOnly())
				.OnClicked(this, &FControlRigArgumentLayout::OnArgMoveUp)
				.ToolTipText(LOCTEXT("FunctionArgDetailsArgMoveUpTooltip", "Move this parameter up in the list."))
				[
					SNew(SImage)
					.Image(FEditorStyle::GetBrush("Icons.ChevronUp"))
				.ColorAndOpacity(FSlateColor::UseForeground())
				]
			]
			+ SHorizontalBox::Slot()
			.AutoWidth()
			.Padding(2, 0)
			[
				SNew(SButton)
				.ButtonStyle(FAppStyle::Get(), TEXT("SimpleButton"))
				.ContentPadding(0)
				.IsEnabled(!IsPinEditingReadOnly())
				.OnClicked(this, &FControlRigArgumentLayout::OnArgMoveDown)
				.ToolTipText(LOCTEXT("FunctionArgDetailsArgMoveDownTooltip", "Move this parameter down in the list."))
				[
					SNew(SImage)
					.Image(FEditorStyle::GetBrush("Icons.ChevronDown"))
					.ColorAndOpacity(FSlateColor::UseForeground())
				]
			]
			+ SHorizontalBox::Slot()
			.HAlign(HAlign_Right)
			.VAlign(VAlign_Center)
			.Padding(10, 0, 0, 0)
			.AutoWidth()
			[
				PropertyCustomizationHelpers::MakeClearButton(FSimpleDelegate::CreateSP(this, &FControlRigArgumentLayout::OnRemoveClicked), LOCTEXT("FunctionArgDetailsClearTooltip", "Remove this parameter."), !IsPinEditingReadOnly())
			]
		];
}

void FControlRigArgumentLayout::GenerateChildContent(IDetailChildrenBuilder& ChildrenBuilder)
{
	// we don't show defaults here - we rely on a SControlRigGraphNode widget in the top of the details
}

void FControlRigArgumentLayout::OnRemoveClicked()
{
	if (PinPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		URigVMPin* Pin = PinPtr.Get();
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(Pin->GetNode()))
		{
			if (URigVMController* Controller = Blueprint->GetController(LibraryNode->GetContainedGraph()))
			{
				Controller->RemoveExposedPin(Pin->GetFName(), true);
			}
		}
	}
}

FReply FControlRigArgumentLayout::OnArgMoveUp()
{
	if (PinPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		URigVMPin* Pin = PinPtr.Get();
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(Pin->GetNode()))
		{
			if (URigVMController* Controller = Blueprint->GetController(LibraryNode->GetContainedGraph()))
			{
				Controller->SetExposedPinIndex(Pin->GetFName(), Pin->GetPinIndex() - 1);
				return FReply::Handled();
			}
		}
	}
	return FReply::Unhandled();
}

FReply FControlRigArgumentLayout::OnArgMoveDown()
{
	if (PinPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		URigVMPin* Pin = PinPtr.Get();
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(Pin->GetNode()))
		{
			if (URigVMController* Controller = Blueprint->GetController(LibraryNode->GetContainedGraph()))
			{
				Controller->SetExposedPinIndex(Pin->GetFName(), Pin->GetPinIndex() + 1);
				return FReply::Handled();
			}
		}
	}
	return FReply::Unhandled();
}

bool FControlRigArgumentLayout::ShouldPinBeReadOnly(bool bIsEditingPinType/* = false*/) const
{
	return IsPinEditingReadOnly(bIsEditingPinType);
}

bool FControlRigArgumentLayout::IsPinEditingReadOnly(bool bIsEditingPinType/* = false*/) const
{
	/*
	if (PinPtr.IsValid())
	{
		return PinPtr.Get()->IsExecuteContext();
	}
	*/
	return false;
}

FText FControlRigArgumentLayout::OnGetArgNameText() const
{
	if (PinPtr.IsValid())
	{
		return FText::FromName(PinPtr.Get()->GetFName());
	}
	return FText();
}

FText FControlRigArgumentLayout::OnGetArgToolTipText() const
{
	return OnGetArgNameText(); // for now since we don't have tooltips
}

void FControlRigArgumentLayout::OnArgNameChange(const FText& InNewText)
{
	// do we need validation?
}

void FControlRigArgumentLayout::OnArgNameTextCommitted(const FText& NewText, ETextCommit::Type InTextCommit)
{
	if (!NewText.IsEmpty() && PinPtr.IsValid() && ControlRigBlueprintPtr.IsValid() && !ShouldPinBeReadOnly())
	{
		URigVMPin* Pin = PinPtr.Get();
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(Pin->GetNode()))
		{
			if (URigVMController* Controller = Blueprint->GetController(LibraryNode->GetContainedGraph()))
			{
				const FString& NewName = NewText.ToString();
				Controller->RenameExposedPin(Pin->GetFName(), *NewName, true);
			}
		}
	}
}

FEdGraphPinType FControlRigArgumentLayout::OnGetPinInfo() const
{
	if (PinPtr.IsValid())
	{
		return UControlRigGraphNode::GetPinTypeForModelPin(PinPtr.Get());
	}
	return FEdGraphPinType();
}

void FControlRigArgumentLayout::PinInfoChanged(const FEdGraphPinType& PinType)
{
	if (PinPtr.IsValid() && ControlRigBlueprintPtr.IsValid() && FBlueprintEditorUtils::IsPinTypeValid(PinType))
	{
		URigVMPin* Pin = PinPtr.Get();
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(Pin->GetNode()))
		{
			if (URigVMController* Controller = Blueprint->GetController(LibraryNode->GetContainedGraph()))
			{
				FRigVMExternalVariable ExternalVariable = UControlRig::GetExternalVariableFromPinType(Pin->GetFName(), PinType, true, false);
				if (!ExternalVariable.IsValid(true /* allow nullptr memory */))
				{
					return;
				}

				FString CPPType = ExternalVariable.TypeName.ToString();
				FName CPPTypeObjectName = NAME_None;
				if (ExternalVariable.TypeObject)
				{
					CPPTypeObjectName = *ExternalVariable.TypeObject->GetPathName();

					if (UScriptStruct* ScriptStruct = Cast<UScriptStruct>(ExternalVariable.TypeObject))
					{
						CPPType = ScriptStruct->GetStructCPPName();
					}
				}

				if (ExternalVariable.bIsArray)
				{
					CPPType = FString::Printf(TEXT("TArray<%s>"), *CPPType);
				}

				bool bSetupUndoRedo = true;
				Controller->ChangeExposedPinType(Pin->GetFName(), CPPType, CPPTypeObjectName, bSetupUndoRedo);

				// If the controller has identified this as a bulk change, it has not added the actions to the action stack
				// We need to disable the transaction from the UI as well to keep them synced
				if (!bSetupUndoRedo)
				{
					GEditor->CancelTransaction(0);
				}
			}
		}
	}
}

void FControlRigArgumentLayout::OnPrePinInfoChange(const FEdGraphPinType& PinType)
{
	// not needed for Control Rig
}

FControlRigArgumentDefaultNode::FControlRigArgumentDefaultNode(
	URigVMGraph* InGraph,
	UControlRigBlueprint* InBlueprint
)
	: GraphPtr(InGraph)
	, ControlRigBlueprintPtr(InBlueprint)
{
	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		ControlRigBlueprintPtr.Get()->OnModified().AddRaw(this, &FControlRigArgumentDefaultNode::HandleModifiedEvent);

		if (URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(GraphPtr->GetOuter()))
		{
			if (UControlRigGraph* RigGraph = Cast<UControlRigGraph>(ControlRigBlueprintPtr->GetEdGraph(LibraryNode->GetGraph())))
			{
				GraphChangedDelegateHandle = RigGraph->AddOnGraphChangedHandler(
					FOnGraphChanged::FDelegate::CreateRaw(this, &FControlRigArgumentDefaultNode::OnGraphChanged)
				);
			}
		}
	}
}

FControlRigArgumentDefaultNode::~FControlRigArgumentDefaultNode()
{
	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		ControlRigBlueprintPtr.Get()->OnModified().RemoveAll(this);

		if (URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(GraphPtr->GetOuter()))
		{
			if (UControlRigGraph* RigGraph = Cast<UControlRigGraph>(ControlRigBlueprintPtr->GetEdGraph(LibraryNode->GetGraph())))
			{
				if (GraphChangedDelegateHandle.IsValid())
				{
					RigGraph->RemoveOnGraphChangedHandler(GraphChangedDelegateHandle);
				}
			}
		}
	}
}

void FControlRigArgumentDefaultNode::GenerateChildContent(IDetailChildrenBuilder& ChildrenBuilder)
{
	if (!GraphPtr.IsValid() || !ControlRigBlueprintPtr.IsValid())
	{
		return;
	}

	UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
	URigVMGraph* Graph = GraphPtr.Get();
	UControlRigGraphNode* ControlRigGraphNode = nullptr;
	if (URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(Graph->GetOuter()))
	{
		if (UControlRigGraph* RigGraph = Cast<UControlRigGraph>(Blueprint->GetEdGraph(LibraryNode->GetGraph())))
		{
			ControlRigGraphNode = Cast<UControlRigGraphNode>(RigGraph->FindNodeForModelNodeName(LibraryNode->GetFName()));
		}
	}

	if (ControlRigGraphNode == nullptr)
	{
		return;
	}

	ChildrenBuilder.AddCustomRow(FText::GetEmpty())
	.WholeRowContent()
	.MaxDesiredWidth(980.f)
	[
		SAssignNew(OwnedNodeWidget, SControlRigGraphNode).GraphNodeObj(ControlRigGraphNode)
	];
}

void FControlRigArgumentDefaultNode::OnGraphChanged(const FEdGraphEditAction& InAction)
{
	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		OnRebuildChildren.ExecuteIfBound();
	}
}

void FControlRigArgumentDefaultNode::HandleModifiedEvent(ERigVMGraphNotifType InNotifType, URigVMGraph* InGraph, UObject* InSubject)
{
	if (!GraphPtr.IsValid())
	{
		return;
	}

	URigVMGraph* Graph = GraphPtr.Get();
	URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(Graph->GetOuter());
	if (LibraryNode == nullptr)
	{
		return;
	}
	if (LibraryNode->GetGraph() != InGraph)
	{
		return;
	}

	switch (InNotifType)
	{
		case ERigVMGraphNotifType::PinAdded:
		case ERigVMGraphNotifType::PinRemoved:
		case ERigVMGraphNotifType::PinTypeChanged:
		case ERigVMGraphNotifType::PinIndexChanged:
		case ERigVMGraphNotifType::PinRenamed:
		{
			URigVMPin* Pin = CastChecked<URigVMPin>(InSubject);
			if (Pin->GetNode() == LibraryNode)
			{
				OnRebuildChildren.ExecuteIfBound();
			}
			break;
		}
		case ERigVMGraphNotifType::NodeRenamed:
		case ERigVMGraphNotifType::NodeColorChanged:
		{
			URigVMNode* Node = CastChecked<URigVMNode>(InSubject);
			if (Node == LibraryNode)
			{
				OnRebuildChildren.ExecuteIfBound();
			}
			break;
		}
		default:
		{
			break;
		}
	}
}

TSharedPtr<IDetailCustomization> FControlRigGraphDetails::MakeInstance(TSharedPtr<IBlueprintEditor> InBlueprintEditor)
{
	const TArray<UObject*>* Objects = (InBlueprintEditor.IsValid() ? InBlueprintEditor->GetObjectsCurrentlyBeingEdited() : nullptr);
	if (Objects && Objects->Num() == 1)
	{
		if (UControlRigBlueprint* ControlRigBlueprint = Cast<UControlRigBlueprint>((*Objects)[0]))
		{
			return MakeShareable(new FControlRigGraphDetails(StaticCastSharedPtr<IControlRigEditor>(InBlueprintEditor), ControlRigBlueprint));
		}
	}

	return nullptr;
}

void FControlRigGraphDetails::CustomizeDetails(IDetailLayoutBuilder& DetailLayout)
{
	bIsPickingColor = false;

	TArray<TWeakObjectPtr<UObject>> Objects;
	DetailLayout.GetObjectsBeingCustomized(Objects);

	GraphPtr = CastChecked<UControlRigGraph>(Objects[0].Get());
	UControlRigGraph* Graph = GraphPtr.Get();

	UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
	URigVMGraph* Model = nullptr;
	URigVMController* Controller = nullptr;

	if (Blueprint)
	{
		Model = Blueprint->GetModel(Graph);
		Controller = Blueprint->GetController(Model);
	}

	if (Blueprint == nullptr || Model == nullptr || Controller == nullptr)
	{
		IDetailCategoryBuilder& Category = DetailLayout.EditCategory("Graph", LOCTEXT("FunctionDetailsGraph", "Graph"));
		Category.AddCustomRow(FText::GetEmpty())
		[
			SNew(STextBlock)
			.Text(LOCTEXT("GraphPresentButNotEditable", "Graph is not editable."))
		];
		return;
	}

	if (Model->IsTopLevelGraph())
	{
		IDetailCategoryBuilder& Category = DetailLayout.EditCategory("Graph", LOCTEXT("FunctionDetailsGraph", "Graph"));
		Category.AddCustomRow(FText::GetEmpty())
			[
				SNew(STextBlock)
				.Text(LOCTEXT("GraphIsTopLevelGraph", "Top-level Graphs are not editable."))
			];
		return;
	}

	IDetailCategoryBuilder& InputsCategory = DetailLayout.EditCategory("Inputs", LOCTEXT("FunctionDetailsInputs", "Inputs"));
	TSharedRef<FControlRigArgumentGroupLayout> InputArgumentGroup = MakeShareable(new FControlRigArgumentGroupLayout(
		Model, 
		Blueprint, 
		true));
	InputsCategory.AddCustomBuilder(InputArgumentGroup);

	TSharedRef<SHorizontalBox> InputsHeaderContentWidget = SNew(SHorizontalBox);

	InputsHeaderContentWidget->AddSlot()
	.HAlign(HAlign_Right)
	[
		SNew(SButton)
		.ButtonStyle(FEditorStyle::Get(), "SimpleButton")
		.ContentPadding(FMargin(1, 0))
		.OnClicked(this, &FControlRigGraphDetails::OnAddNewInputClicked)
		.Visibility(this, &FControlRigGraphDetails::GetAddNewInputOutputVisibility)
		.HAlign(HAlign_Right)
		.ToolTipText(LOCTEXT("FunctionNewInputArgTooltip", "Create a new input argument"))
		.VAlign(VAlign_Center)
		.AddMetaData<FTagMetaData>(FTagMetaData(TEXT("FunctionNewInputArg")))
		.IsEnabled(this, &FControlRigGraphDetails::IsAddNewInputOutputEnabled)
		[
			SNew(SImage)
			.Image(FAppStyle::Get().GetBrush("Icons.PlusCircle"))
			.ColorAndOpacity(FSlateColor::UseForeground())
		]
	];
	InputsCategory.HeaderContent(InputsHeaderContentWidget);

	IDetailCategoryBuilder& OutputsCategory = DetailLayout.EditCategory("Outputs", LOCTEXT("FunctionDetailsOutputs", "Outputs"));
	TSharedRef<FControlRigArgumentGroupLayout> OutputArgumentGroup = MakeShareable(new FControlRigArgumentGroupLayout(
		Model, 
		Blueprint, 
		false));
	OutputsCategory.AddCustomBuilder(OutputArgumentGroup);

	TSharedRef<SHorizontalBox> OutputsHeaderContentWidget = SNew(SHorizontalBox);

	OutputsHeaderContentWidget->AddSlot()
	.HAlign(HAlign_Right)
	[
		SNew(SButton)
		.ButtonStyle(FEditorStyle::Get(), "SimpleButton")
		.ContentPadding(FMargin(1, 0))
		.OnClicked(this, &FControlRigGraphDetails::OnAddNewOutputClicked)
		.Visibility(this, &FControlRigGraphDetails::GetAddNewInputOutputVisibility)
		.HAlign(HAlign_Right)
		.ToolTipText(LOCTEXT("FunctionNewOutputArgTooltip", "Create a new output argument"))
		.VAlign(VAlign_Center)
		.AddMetaData<FTagMetaData>(FTagMetaData(TEXT("FunctionNewOutputArg")))
		.IsEnabled(this, &FControlRigGraphDetails::IsAddNewInputOutputEnabled)
		[
			SNew(SImage)
			.Image(FAppStyle::Get().GetBrush("Icons.PlusCircle"))
			.ColorAndOpacity(FSlateColor::UseForeground())
		]
	];
	OutputsCategory.HeaderContent(OutputsHeaderContentWidget);

	IDetailCategoryBuilder& SettingsCategory = DetailLayout.EditCategory("NodeSettings", LOCTEXT("FunctionDetailsNodeSettings", "Node Settings"));

	bool bIsFunction = false;
	if (Model)
	{
		if (URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(Model->GetOuter()))
		{
			bIsFunction = LibraryNode->GetGraph()->IsA<URigVMFunctionLibrary>();
		}
	}

	if(bIsFunction)
	{
		// node category
		SettingsCategory.AddCustomRow(FText::GetEmpty())
		.NameContent()
		[
			SNew(STextBlock)
			.Text(FText::FromString(TEXT("Category")))
			.Font(IDetailLayoutBuilder::GetDetailFont())
		]
		.ValueContent()
		[
			SNew(SEditableTextBox)
			.Font(IDetailLayoutBuilder::GetDetailFont())
			.Text(this, &FControlRigGraphDetails::GetNodeCategory)
			.OnTextCommitted(this, &FControlRigGraphDetails::SetNodeCategory)
			.OnVerifyTextChanged_Lambda([&](const FText& InNewText, FText& OutErrorMessage) -> bool
			{
				const FText NewText = FEditorCategoryUtils::GetCategoryDisplayString(InNewText);
				if (NewText.IsEmpty())
				{
					OutErrorMessage = LOCTEXT("CategoryEmpty", "Cannot add a category with an empty string.");
					return false;
				}
				if (ControlRigBlueprintPtr.IsValid())
				{
					if (NewText.EqualTo(FText::FromString(ControlRigBlueprintPtr.Get()->GetName())))
					{
						OutErrorMessage = LOCTEXT("CategoryEqualsBlueprintName", "Cannot add a category with the same name as the blueprint.");
						return false;
					}
				}
				return true;
			})
		];

		// node keywords
		SettingsCategory.AddCustomRow(FText::GetEmpty())
		.NameContent()
		[
			SNew(STextBlock)
			.Text(FText::FromString(TEXT("Keywords")))
			.Font(IDetailLayoutBuilder::GetDetailFont())
		]
		.ValueContent()
		[
			SNew(SEditableTextBox)
			.Font(IDetailLayoutBuilder::GetDetailFont())
			.Text(this, &FControlRigGraphDetails::GetNodeKeywords)
			.OnTextCommitted(this, &FControlRigGraphDetails::SetNodeKeywords)
		];

		// description
		SettingsCategory.AddCustomRow(FText::GetEmpty())
		.NameContent()
		[
			SNew(STextBlock)
			.Text(FText::FromString(TEXT("Description")))
			.Font(IDetailLayoutBuilder::GetDetailFont())
		]
		.ValueContent()
		[
			SNew(SMultiLineEditableText)
			.Font(IDetailLayoutBuilder::GetDetailFont())
			.Text(this, &FControlRigGraphDetails::GetNodeDescription)
			.OnTextCommitted(this, &FControlRigGraphDetails::SetNodeDescription)
		];

		if(AccessSpecifierStrings.IsEmpty())
		{
			AccessSpecifierStrings.Add(TSharedPtr<FString>(new FString(TEXT("Public"))));
			AccessSpecifierStrings.Add(TSharedPtr<FString>(new FString(TEXT("Private"))));
		}

		// access specifier
		SettingsCategory.AddCustomRow( LOCTEXT( "AccessSpecifier", "Access Specifier" ) )
        .NameContent()
        [
            SNew(STextBlock)
                .Text( LOCTEXT( "AccessSpecifier", "Access Specifier" ) )
                .Font( IDetailLayoutBuilder::GetDetailFont() )
        ]
        .ValueContent()
        [
            SNew(SComboButton)
            .ContentPadding(0)
            .ButtonContent()
            [
                SNew(STextBlock)
                    .Text(this, &FControlRigGraphDetails::GetCurrentAccessSpecifierName)
                    .Font( IDetailLayoutBuilder::GetDetailFont() )
            ]
            .MenuContent()
            [
                SNew(SListView<TSharedPtr<FString> >)
                    .ListItemsSource( &AccessSpecifierStrings )
                    .OnGenerateRow(this, &FControlRigGraphDetails::HandleGenerateRowAccessSpecifier)
                    .OnSelectionChanged(this, &FControlRigGraphDetails::OnAccessSpecifierSelected)
            ]
        ];
	}

	// node color
	SettingsCategory.AddCustomRow(FText::GetEmpty())
	.NameContent()
	[
		SNew(STextBlock)
		.Text(FText::FromString(TEXT("Color")))
		.Font(IDetailLayoutBuilder::GetDetailFont())
	]
	.ValueContent()
	[
		SNew(SButton)
		.ButtonStyle(FEditorStyle::Get(), "Menu.Button")
		.OnClicked(this, &FControlRigGraphDetails::OnNodeColorClicked)
		[
			SAssignNew(ColorBlock, SColorBlock)
			.Color(this, &FControlRigGraphDetails::GetNodeColor)
			.Size(FVector2D(77, 16))
		]
	];

	IDetailCategoryBuilder& DefaultsCategory = DetailLayout.EditCategory("NodeDefaults", LOCTEXT("FunctionDetailsNodeDefaults", "Node Defaults"));
	TSharedRef<FControlRigArgumentDefaultNode> DefaultsArgumentNode = MakeShareable(new FControlRigArgumentDefaultNode(
		Model,
		Blueprint));
	DefaultsCategory.AddCustomBuilder(DefaultsArgumentNode);

}

bool FControlRigGraphDetails::IsAddNewInputOutputEnabled() const
{
	return true;
}

EVisibility FControlRigGraphDetails::GetAddNewInputOutputVisibility() const
{
	return EVisibility::Visible;
}

FReply FControlRigGraphDetails::OnAddNewInputClicked()
{
	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		URigVMGraph* Model = Blueprint->GetModel(GraphPtr.Get());
		if (URigVMController* Controller = Blueprint->GetController(Model))
		{
			FName ArgumentName = TEXT("Argument");
			FString CPPType = TEXT("bool");
			FName CPPTypeObjectPath = NAME_None;
			FString DefaultValue = TEXT("False");

			if (URigVMLibraryNode* LibraryNode = Cast<URigVMLibraryNode>(Model->GetOuter()))
			{
				if (LibraryNode->GetPins().Num() > 0)
				{
					URigVMPin* LastPin = LibraryNode->GetPins().Last();
					if (!LastPin->IsExecuteContext())
					{
						ArgumentName = LastPin->GetFName();
						CPPType = LastPin->GetCPPType();
						if (LastPin->GetCPPTypeObject())
						{
							CPPTypeObjectPath = *LastPin->GetCPPTypeObject()->GetPathName();
						}
						DefaultValue = LastPin->GetDefaultValue();
					}
				}
			}

			Controller->AddExposedPin(ArgumentName, ERigVMPinDirection::Input, CPPType, CPPTypeObjectPath, DefaultValue, true);
		}
	}
	return FReply::Unhandled();
}

FReply FControlRigGraphDetails::OnAddNewOutputClicked()
{
	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		URigVMGraph* Model = Blueprint->GetModel(GraphPtr.Get());
		if (URigVMController* Controller = Blueprint->GetController(Model))
		{
			FName ArgumentName = TEXT("Argument");
			FString CPPType = TEXT("bool");
			FName CPPTypeObjectPath = NAME_None;
			FString DefaultValue = TEXT("False");
			// todo: base decisions on types on last argument

			Controller->AddExposedPin(ArgumentName, ERigVMPinDirection::Output, CPPType, CPPTypeObjectPath, DefaultValue, true);
		}
	}
	return FReply::Unhandled();
}

FText FControlRigGraphDetails::GetNodeCategory() const
{
	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMGraph* Model = Blueprint->GetModel(GraphPtr.Get()))
		{
			if (URigVMCollapseNode* OuterNode = Cast<URigVMCollapseNode>(Model->GetOuter()))
			{
				return FText::FromString(OuterNode->GetNodeCategory());
			}
		}
	}

	return FText();
}

void FControlRigGraphDetails::SetNodeCategory(const FText& InNewText, ETextCommit::Type InCommitType)
{
	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMGraph* Model = Blueprint->GetModel(GraphPtr.Get()))
		{
			if (URigVMCollapseNode* OuterNode = Cast<URigVMCollapseNode>(Model->GetOuter()))
			{
				if (URigVMController* Controller = Blueprint->GetOrCreateController(OuterNode->GetGraph()))
				{
					Controller->SetNodeCategory(OuterNode, InNewText.ToString());
				}
			}
		}
	}
}

FText FControlRigGraphDetails::GetNodeKeywords() const
{
	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMGraph* Model = Blueprint->GetModel(GraphPtr.Get()))
		{
			if (URigVMCollapseNode* OuterNode = Cast<URigVMCollapseNode>(Model->GetOuter()))
			{
				return FText::FromString(OuterNode->GetNodeKeywords());
			}
		}
	}

	return FText();
}

void FControlRigGraphDetails::SetNodeKeywords(const FText& InNewText, ETextCommit::Type InCommitType)
{
	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMGraph* Model = Blueprint->GetModel(GraphPtr.Get()))
		{
			if (URigVMCollapseNode* OuterNode = Cast<URigVMCollapseNode>(Model->GetOuter()))
			{
				if (URigVMController* Controller = Blueprint->GetOrCreateController(OuterNode->GetGraph()))
				{
					Controller->SetNodeKeywords(OuterNode, InNewText.ToString());
				}
			}
		}
	}
}

FText FControlRigGraphDetails::GetNodeDescription() const
{
	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMGraph* Model = Blueprint->GetModel(GraphPtr.Get()))
		{
			if (URigVMCollapseNode* OuterNode = Cast<URigVMCollapseNode>(Model->GetOuter()))
			{
				return FText::FromString(OuterNode->GetNodeDescription());
			}
		}
	}

	return FText();
}

void FControlRigGraphDetails::SetNodeDescription(const FText& InNewText, ETextCommit::Type InCommitType)
{
	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMGraph* Model = Blueprint->GetModel(GraphPtr.Get()))
		{
			if (URigVMCollapseNode* OuterNode = Cast<URigVMCollapseNode>(Model->GetOuter()))
			{
				if (URigVMController* Controller = Blueprint->GetOrCreateController(OuterNode->GetGraph()))
				{
					Controller->SetNodeDescription(OuterNode, InNewText.ToString());
				}
			}
		}
	}
}

FLinearColor FControlRigGraphDetails::GetNodeColor() const
{
	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMGraph* Model = Blueprint->GetModel(GraphPtr.Get()))
		{
			if (URigVMCollapseNode* OuterNode = Cast<URigVMCollapseNode>(Model->GetOuter()))
			{
				return OuterNode->GetNodeColor();
			}
		}
	}
	return FLinearColor::White;
}

void FControlRigGraphDetails::SetNodeColor(FLinearColor InColor, bool bSetupUndoRedo)
{
	TargetColor = InColor;

	if (GraphPtr.IsValid() && ControlRigBlueprintPtr.IsValid())
	{
		UControlRigBlueprint* Blueprint = ControlRigBlueprintPtr.Get();
		if (URigVMGraph* Model = Blueprint->GetModel(GraphPtr.Get()))
		{
			if (URigVMCollapseNode* OuterNode = Cast<URigVMCollapseNode>(Model->GetOuter()))
			{
				if (URigVMController* Controller = Blueprint->GetOrCreateController(OuterNode->GetGraph()))
				{
					Controller->SetNodeColor(OuterNode, TargetColor, bSetupUndoRedo, bIsPickingColor);
				}
			}
		}
	}
}

void FControlRigGraphDetails::OnNodeColorBegin()
{
	bIsPickingColor = true;
}
void FControlRigGraphDetails::OnNodeColorEnd()
{ 
	bIsPickingColor = false; 
}

void FControlRigGraphDetails::OnNodeColorCancelled(FLinearColor OriginalColor)
{
	SetNodeColor(OriginalColor, true);
}

FReply FControlRigGraphDetails::OnNodeColorClicked()
{
	TargetColor = GetNodeColor();
	TargetColors.Reset();
	TargetColors.Add(&TargetColor);

	FColorPickerArgs PickerArgs;
	PickerArgs.ParentWidget = ColorBlock;
	PickerArgs.bUseAlpha = false;
	PickerArgs.DisplayGamma = false;
	PickerArgs.InitialColorOverride = TargetColor;
	PickerArgs.LinearColorArray = &TargetColors;
	PickerArgs.OnInteractivePickBegin = FSimpleDelegate::CreateSP(this, &FControlRigGraphDetails::OnNodeColorBegin);
	PickerArgs.OnInteractivePickEnd = FSimpleDelegate::CreateSP(this, &FControlRigGraphDetails::OnNodeColorEnd);
	PickerArgs.OnColorCommitted = FOnLinearColorValueChanged::CreateSP(this, &FControlRigGraphDetails::SetNodeColor, true);
	PickerArgs.OnColorPickerCancelled = FOnColorPickerCancelled::CreateSP(this, &FControlRigGraphDetails::OnNodeColorCancelled);
	OpenColorPicker(PickerArgs);
	return FReply::Handled();
}

TArray<TSharedPtr<FString>> FControlRigGraphDetails::AccessSpecifierStrings;

FText FControlRigGraphDetails::GetCurrentAccessSpecifierName() const
{
	if(ControlRigBlueprintPtr.IsValid() && GraphPtr.IsValid())
	{
		UControlRigGraph* Graph = GraphPtr.Get();
		UControlRigBlueprint* ControlRigBlueprint = ControlRigBlueprintPtr.Get();

		const FControlRigPublicFunctionData ExpectedFunctionData = Graph->GetPublicFunctionData();
		if(ControlRigBlueprint->IsFunctionPublic(ExpectedFunctionData.Name))
		{
			return FText::FromString(*AccessSpecifierStrings[0].Get()); // public
		}
	}

	return FText::FromString(*AccessSpecifierStrings[1].Get()); // private
}

void FControlRigGraphDetails::OnAccessSpecifierSelected( TSharedPtr<FString> SpecifierName, ESelectInfo::Type SelectInfo )
{
	if(ControlRigBlueprintPtr.IsValid() && GraphPtr.IsValid())
	{
		UControlRigGraph* Graph = GraphPtr.Get();
		UControlRigBlueprint* ControlRigBlueprint = ControlRigBlueprintPtr.Get();
		const FControlRigPublicFunctionData ExpectedFunctionData = Graph->GetPublicFunctionData();
		
		if(SpecifierName->Equals(TEXT("Private")))
		{
			ControlRigBlueprint->MarkFunctionPublic(ExpectedFunctionData.Name, false);
		}
		else
		{
			ControlRigBlueprint->MarkFunctionPublic(ExpectedFunctionData.Name, true);
		}
	}
}

TSharedRef<ITableRow> FControlRigGraphDetails::HandleGenerateRowAccessSpecifier( TSharedPtr<FString> SpecifierName, const TSharedRef<STableViewBase>& OwnerTable )
{
	return SNew(STableRow< TSharedPtr<FString> >, OwnerTable)
        .Content()
        [
            SNew( STextBlock ) 
                .Text(FText::FromString(*SpecifierName.Get()) )
        ];
}

#undef LOCTEXT_NAMESPACE