UnrealEngineUWP/Engine/Source/Editor/SkeletonEditor/Private/SSkeletonTree.cpp

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


#include "SkeletonEditorPrivatePCH.h"
#include "SSkeletonTree.h"

#include "ScopedTransaction.h"
#include "BoneDragDropOp.h"
#include "SocketDragDropOp.h"
#include "SkeletonTreeCommands.h"
#include "DragAndDrop/AssetDragDropOp.h"

#include "AssetSelection.h"

#include "Editor/ContentBrowser/Public/ContentBrowserModule.h"
#include "ComponentAssetBroker.h"

#include "SlateIconFinder.h"

#include "Editor/UnrealEd/Public/AssetNotifications.h"

#include "Animation/PreviewAssetAttachComponent.h"
#include "AnimPreviewInstance.h"

#include "Factories.h"
#include "Developer/MeshUtilities/Public/MeshUtilities.h"
#include "UnrealExporter.h"
#include "SSearchBox.h"
#include "SInlineEditableTextBlock.h"
#include "SNotificationList.h"
#include "NotificationManager.h"
#include "GenericCommands.h"
#include "Animation/BlendProfile.h"
#include "SBlendProfilePicker.h"
#include "IPersonaPreviewScene.h"
#include "IDocumentation.h"
#include "PersonaUtils.h"

#include "BoneSelectionWidget.h"

#define LOCTEXT_NAMESPACE "SSkeletonTree"

static const FName	ColumnID_BoneLabel( "BoneName" );
static const FName	ColumnID_RetargetingLabel( "TranslationRetargeting" );
static const FName  ColumnID_BlendProfileLabel( "BlendProfile" );

DECLARE_DELEGATE_RetVal_TwoParams(FReply, FOnDraggingBoneItem, const FGeometry&, const FPointerEvent&);

//////////////////////////////////////////////////////////////////////////
// SSkeletonTreeRow

DECLARE_DELEGATE_RetVal_TwoParams(FReply, FOnDraggingTreeItem, const FGeometry&, const FPointerEvent&);

typedef TSharedPtr< FDisplayedTreeRowInfo > FDisplayedTreeRowInfoPtr;

class SSkeletonTreeRow
	: public SMultiColumnTableRow< FDisplayedTreeRowInfoPtr >
{
public:

	SLATE_BEGIN_ARGS(SSkeletonTreeRow) {}

	/** The item for this row **/
	SLATE_ARGUMENT(FDisplayedTreeRowInfoPtr, Item)

	/** Pointer to the owning skeleton tree so it can be used to copy sockets, tree refresh when needed etc */
	SLATE_ARGUMENT(TWeakPtr< SSkeletonTree >, SkeletonTree);

	/** Pointer to the owning skeleton tree so it can be used to copy sockets, tree refresh when needed etc */
	SLATE_ARGUMENT(TWeakPtr< FEditableSkeleton >, EditableSkeleton);

	/** Filter text typed by the user into the parent tree's search widget */
	SLATE_ARGUMENT(FText, FilterText);

	/** Delegate for dragging items **/
	SLATE_EVENT(FOnDraggingTreeItem, OnDraggingItem);

	SLATE_END_ARGS()

	void Construct(const FArguments& InArgs, const TSharedRef<STableViewBase>& InOwnerTableView);

	/** Overridden from SMultiColumnTableRow.  Generates a widget for this column of the tree row. */
	virtual TSharedRef<SWidget> GenerateWidgetForColumn(const FName& ColumnName) override;

	/** Overridden from STableRow. Allows us to generate inline edit widgets. */
	virtual void ConstructChildren(ETableViewMode::Type InOwnerTableMode, const TAttribute<FMargin>& InPadding, const TSharedRef<SWidget>& InContent) override;

	/** Override OnDragEnter for drag and drop of sockets onto bones */
	virtual void OnDragEnter(const FGeometry& MyGeometry, const FDragDropEvent& DragDropEvent) override;

	/** Override OnDragLeave for drag and drop of sockets onto bones */
	virtual void OnDragLeave(const FDragDropEvent& DragDropEvent) override;

	/** Override OnDrop for drag and drop of sockets and meshes onto bones */
	virtual FReply OnDrop(const FGeometry& MyGeometry, const FDragDropEvent& DragDropEvent) override;

	/** Override DoesItemHaveChildren to add expander to in-line editors */
	virtual int32 DoesItemHaveChildren() const override;

	/** @return true if the corresponding item is expanded; false otherwise */
	virtual bool IsItemExpanded() const override;

	/** Toggle the expansion of the item associated with this row */
	virtual void ToggleExpansion() override;

protected:

	/** Handler for starting a drag/drop action */
	virtual FReply OnDragDetected(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent) override;

	/** Get the editable skeleton we are editing */
	TSharedRef<FEditableSkeleton> GetEditableSkeleton() const { return EditableSkeleton.Pin().ToSharedRef();  }

	/** Get the skeleton tree we are embedded in */
	TSharedRef<SSkeletonTree>	GetSkeletonTree() const { return SkeletonTree.Pin().ToSharedRef(); }

private:

	/** The item this row is holding */
	FDisplayedTreeRowInfoPtr	Item;

	/** Text the user typed into the search box - used for text highlighting */
	FText						FilterText;

	/** Weak pointer to the owning skeleton tree */
	TWeakPtr<SSkeletonTree>		SkeletonTree;

	/** Weak pointer to the owning editable skeleton */
	TWeakPtr<FEditableSkeleton>	EditableSkeleton;

	/** Item that we're dragging */
	FOnDraggingTreeItem			OnDraggingItem;

	/** Was the user pressing "Alt" when the drag was started? */
	bool						bIsAltDrag;
};


void SSkeletonTreeRow::Construct( const FArguments& InArgs, const TSharedRef<STableViewBase>& InOwnerTableView )
{
	Item = InArgs._Item;
	OnDraggingItem = InArgs._OnDraggingItem;
	FilterText = InArgs._FilterText;
	EditableSkeleton = InArgs._EditableSkeleton;
	SkeletonTree = InArgs._SkeletonTree;

	check( Item.IsValid() );

	SMultiColumnTableRow< FDisplayedTreeRowInfoPtr >::Construct( FSuperRowType::FArguments(), InOwnerTableView );
}

void SSkeletonTreeRow::ConstructChildren(ETableViewMode::Type InOwnerTableMode, const TAttribute<FMargin>& InPadding, const TSharedRef<SWidget>& InContent)
{
	STableRow<FDisplayedTreeRowInfoPtr>::Content = InContent;

	TSharedRef<SWidget> InlineEditWidget = Item->GenerateInlineEditWidget(FilterText, FIsSelected::CreateSP(this, &STableRow::IsSelected));

	// MultiColumnRows let the user decide which column should contain the expander/indenter item.
	this->ChildSlot
		.Padding(InPadding)
		[
			SNew(SVerticalBox)
			+SVerticalBox::Slot()
			.AutoHeight()
			[
				InContent
			]
			+SVerticalBox::Slot()
			.AutoHeight()
			[
				InlineEditWidget
			]
		];
}

TSharedRef< SWidget > SSkeletonTreeRow::GenerateWidgetForColumn( const FName& ColumnName )
{
	if ( ColumnName == ColumnID_BoneLabel )
	{
		TSharedPtr< SHorizontalBox > RowBox;

		SAssignNew( RowBox, SHorizontalBox );

		RowBox->AddSlot()
			.AutoWidth()
			[
				SNew( SExpanderArrow, SharedThis(this) )
			];

		Item->GenerateWidgetForNameColumn( RowBox, FilterText, FIsSelected::CreateSP(this, &STableRow::IsSelectedExclusively ) );

		return RowBox.ToSharedRef();
	}
	else
	{
		return Item->GenerateWidgetForDataColumn(ColumnName);
	}
}

void SSkeletonTreeRow::OnDragEnter( const FGeometry& MyGeometry, const FDragDropEvent& DragDropEvent )
{
	TSharedPtr<FSocketDragDropOp> DragConnectionOp = DragDropEvent.GetOperationAs<FSocketDragDropOp>();

	// Is someone dragging a socket onto a bone?
	if (DragConnectionOp.IsValid())
	{
		if ( Item->GetType() == ESkeletonTreeRowType::Bone &&
			( *static_cast<FName*>( Item->GetData() ) != DragConnectionOp->GetSocketInfo().Socket->BoneName ) )
		{
			// The socket can be dropped here if we're a bone and NOT the socket's existing parent
			DragConnectionOp->SetIcon( FEditorStyle::GetBrush( TEXT( "Graph.ConnectorFeedback.Ok" ) ) );
		}
		else if ( Item->GetType() == ESkeletonTreeRowType::Bone && DragConnectionOp->IsAltDrag() )
		{
			// For Alt-Drag, dropping onto the existing parent is fine, as we're going to copy, not move the socket
			DragConnectionOp->SetIcon( FEditorStyle::GetBrush( TEXT( "Graph.ConnectorFeedback.Ok" ) ) );
		}
		else
		{
			DragConnectionOp->SetIcon( FEditorStyle::GetBrush( TEXT( "Graph.ConnectorFeedback.Error" ) ) );
		}
	}
}

void SSkeletonTreeRow::OnDragLeave( const FDragDropEvent& DragDropEvent )
{
	TSharedPtr<FSocketDragDropOp> DragConnectionOp = DragDropEvent.GetOperationAs<FSocketDragDropOp>();
	if (DragConnectionOp.IsValid())
	{
		// Reset the drag/drop icon when leaving this row
		DragConnectionOp->SetIcon( FEditorStyle::GetBrush( TEXT( "Graph.ConnectorFeedback.Error" ) ) );
	}
}

FReply SSkeletonTreeRow::OnDrop( const FGeometry& MyGeometry, const FDragDropEvent& DragDropEvent )
{
	TSharedPtr<FSocketDragDropOp> DragConnectionOp = DragDropEvent.GetOperationAs<FSocketDragDropOp>();
	if (DragConnectionOp.IsValid())
	{
		FSelectedSocketInfo SocketInfo = DragConnectionOp->GetSocketInfo();

		if ( DragConnectionOp->IsAltDrag() && Item->GetType() == ESkeletonTreeRowType::Bone )
		{
			// In an alt-drag, the socket can be dropped on any bone
			// (including its existing parent) to create a uniquely named copy
			GetSkeletonTree()->DuplicateAndSelectSocket( SocketInfo, *static_cast<FName*>( Item->GetData() ) );
		}
		else if ( Item->GetType() == ESkeletonTreeRowType::Bone &&
			*static_cast<FName*>( Item->GetData() ) != SocketInfo.Socket->BoneName )
		{
			// The socket can be dropped here if we're a bone and NOT the socket's existing parent
			USkeletalMesh* SkeletalMesh = GetSkeletonTree()->GetPreviewScene().IsValid() ? GetSkeletonTree()->GetPreviewScene()->GetPreviewMeshComponent()->SkeletalMesh : nullptr;
			GetEditableSkeleton()->SetSocketParent(SocketInfo.Socket->SocketName, *static_cast<FName*>(Item->GetData()), SkeletalMesh);

			GetSkeletonTree()->CreateFromSkeleton();

			return FReply::Handled();
		}
	}
	else
	{
		if (DragDropEvent.GetOperationAs<FAssetDragDropOp>().IsValid())
		{
			GetSkeletonTree()->OnDropAssetToSkeletonTree( Item, DragDropEvent );
		}
	}

	return FReply::Unhandled();
}

FReply SSkeletonTreeRow::OnDragDetected( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent )
{
	if ( OnDraggingItem.IsBound() )
	{
		return OnDraggingItem.Execute( MyGeometry, MouseEvent );
	}
	else
	{
		return FReply::Unhandled();
	}
}

int32 SSkeletonTreeRow::DoesItemHaveChildren() const
{
	if(Item->HasInlineEditor())
	{
		return 1;
	}

	return SMultiColumnTableRow<FDisplayedTreeRowInfoPtr>::DoesItemHaveChildren();
}

bool SSkeletonTreeRow::IsItemExpanded() const
{
	return SMultiColumnTableRow<FDisplayedTreeRowInfoPtr>::IsItemExpanded() || Item->IsInlineEditorExpanded();
}

void SSkeletonTreeRow::ToggleExpansion()
{
	SMultiColumnTableRow<FDisplayedTreeRowInfoPtr>::ToggleExpansion();
	
	if (Item->HasInlineEditor())
	{
		Item->ToggleInlineEditorExpansion();
		OwnerTablePtr.Pin()->Private_SetItemExpansion(Item, Item->IsInlineEditorExpanded());
	}
}

//////////////////////////////////////////////////////////////////////////
// FDisplayedTreeRowInfo

TSharedRef<class FEditableSkeleton> FDisplayedTreeRowInfo::GetEditableSkeleton() const
{ 
	return SkeletonTree.Pin()->GetEditableSkeletonInternal(); 
}

//////////////////////////////////////////////////////////////////////////
// FDisplayedMeshBoneInfo

TSharedRef<ITableRow> FDisplayedMeshBoneInfo::MakeTreeRowWidget(const TSharedRef<STableViewBase>& OwnerTable, FText FilterText )
{
	return
		SNew( SSkeletonTreeRow, OwnerTable )
		.Item( SharedThis(this) )
		.FilterText( FilterText )
		.SkeletonTree(SkeletonTree)
		.EditableSkeleton(GetEditableSkeleton())
		.OnDraggingItem( this, &FDisplayedMeshBoneInfo::OnDragDetected );
}

EVisibility FDisplayedMeshBoneInfo::GetLODIconVisibility() const
{
	if (bRequiredBone)
	{
		return EVisibility::Visible;
	}

	return EVisibility::Hidden;
}

void FDisplayedMeshBoneInfo::GenerateWidgetForNameColumn( TSharedPtr< SHorizontalBox > Box, FText& FilterText, FIsSelected InIsSelected )
{
	const FSlateBrush* LODIcon = FEditorStyle::GetBrush("SkeletonTree.LODBone");

	Box->AddSlot()
		.AutoWidth()
		.Padding(FMargin(0.0f, 1.0f))
		.VAlign(VAlign_Center)
		.HAlign(HAlign_Center)
		[
			SNew(SImage)
			.ColorAndOpacity(FSlateColor::UseForeground())
			.Image(LODIcon)
			.Visibility(this, &FDisplayedMeshBoneInfo::GetLODIconVisibility)
		];

	if (GetSkeletonTree()->GetPreviewScene().IsValid())
	{
		UDebugSkelMeshComponent* PreviewComponent = GetSkeletonTree()->GetPreviewScene()->GetPreviewMeshComponent();
		CacheLODChange(PreviewComponent);
	}	
	
	FText ToolTip = GetBoneToolTip();
	Box->AddSlot()
		.AutoWidth()
		.Padding(2, 0, 0, 0)
		.VAlign(VAlign_Center)
		[
			SNew( STextBlock )
			.ColorAndOpacity(this, &FDisplayedMeshBoneInfo::GetBoneTextColor)
			.Text( FText::FromName(BoneName) )
			.HighlightText( FilterText )
			.Font(this, &FDisplayedMeshBoneInfo::GetBoneTextFont)
			.ToolTipText( ToolTip )
		];
}

TSharedRef< SWidget > FDisplayedMeshBoneInfo::GenerateWidgetForDataColumn(const FName& DataColumnName)
{
	if(DataColumnName == ColumnID_RetargetingLabel)
	{
		return 
			SNew(SHorizontalBox)
			+SHorizontalBox::Slot()
			.HAlign(HAlign_Left)
			[
				SAssignNew(RetargetingComboButton, SComboButton)
				.ButtonStyle(FEditorStyle::Get(), "ToggleButton")
				.ForegroundColor(this, &FDisplayedMeshBoneInfo::GetRetargetingComboButtonForegroundColor)
				.ContentPadding(0)
				.OnGetMenuContent(this, &FDisplayedMeshBoneInfo::CreateBoneTranslationRetargetingModeMenu)
				.ToolTip(IDocumentation::Get()->CreateToolTip(
				LOCTEXT("RetargetingToolTip", "Set bone translation retargeting mode"),
				nullptr,
				TEXT("Shared/Editors/Persona"),
				TEXT("TranslationRetargeting")))
				.ButtonContent()
				[
					SNew(SHorizontalBox)
					+SHorizontalBox::Slot()
					.VAlign(VAlign_Center)
					[
						SNew(STextBlock)
						.Text(this, &FDisplayedMeshBoneInfo::GetTranslationRetargetingModeMenuTitle)
					]
				]
			];
	}
	else if(DataColumnName == ColumnID_BlendProfileLabel)
	{
		bool bWritable = true;

		UBlendProfile* CurrentProfile = GetSkeletonTree()->GetSelectedBlendProfile();

		// We should never have this column if we don't have a profile
		check(CurrentProfile);

		return SNew(SBox)
			.Padding(0.0f)
			.HAlign(HAlign_Left)
			[
				SNew(SSpinBox<float>)
				.Style(&FEditorStyle::GetWidgetStyle<FSpinBoxStyle>("SkeletonTree.HyperlinkSpinBox"))
				.ContentPadding(0.0f)
				.MinValue(0.0f)
				.MaxValue(1000.0f)
				.Value(CurrentProfile->GetBoneBlendScale(BoneName))
				.OnValueCommitted(this, &FDisplayedMeshBoneInfo::OnBlendSliderCommitted)
			];
	}

	return SNullWidget::NullWidget;
}

FSlateColor FDisplayedMeshBoneInfo::GetRetargetingComboButtonForegroundColor() const
{
	static const FName InvertedForegroundName("InvertedForeground");
	static const FName DefaultForegroundName("DefaultForeground");

	if (RetargetingComboButton.IsValid())
	{
		return RetargetingComboButton->IsHovered() ? FEditorStyle::GetSlateColor(InvertedForegroundName) : FEditorStyle::GetSlateColor(DefaultForegroundName);
	}
	return FSlateColor::UseForeground();
}

TSharedRef< SWidget > FDisplayedMeshBoneInfo::CreateBoneTranslationRetargetingModeMenu()
{
	FMenuBuilder MenuBuilder(true, nullptr);

	MenuBuilder.BeginSection("BoneTranslationRetargetingMode", LOCTEXT( "BoneTranslationRetargetingModeMenuHeading", "Bone Translation Retargeting Mode" ) );
	{
		UEnum* const Enum = FindObject<UEnum>(ANY_PACKAGE, TEXT("EBoneTranslationRetargetingMode"), true);	
		check(Enum);

		FUIAction ActionRetargetingAnimation = FUIAction(FExecuteAction::CreateSP(this, &FDisplayedMeshBoneInfo::SetBoneTranslationRetargetingMode, EBoneTranslationRetargetingMode::Animation));
		MenuBuilder.AddMenuEntry( Enum->GetDisplayNameText(EBoneTranslationRetargetingMode::Animation), LOCTEXT( "BoneTranslationRetargetingAnimationToolTip", "Use translation from animation." ), FSlateIcon(), ActionRetargetingAnimation);

		FUIAction ActionRetargetingSkeleton = FUIAction(FExecuteAction::CreateSP(this, &FDisplayedMeshBoneInfo::SetBoneTranslationRetargetingMode, EBoneTranslationRetargetingMode::Skeleton));
		MenuBuilder.AddMenuEntry( Enum->GetDisplayNameText(EBoneTranslationRetargetingMode::Skeleton), LOCTEXT( "BoneTranslationRetargetingSkeletonToolTip", "Use translation from Skeleton." ), FSlateIcon(), ActionRetargetingSkeleton);

		FUIAction ActionRetargetingLengthScale = FUIAction(FExecuteAction::CreateSP(this, &FDisplayedMeshBoneInfo::SetBoneTranslationRetargetingMode, EBoneTranslationRetargetingMode::AnimationScaled));
		MenuBuilder.AddMenuEntry( Enum->GetDisplayNameText(EBoneTranslationRetargetingMode::AnimationScaled), LOCTEXT( "BoneTranslationRetargetingAnimationScaledToolTip", "Use translation from animation, scale length by Skeleton's proportions." ), FSlateIcon(), ActionRetargetingLengthScale);

		FUIAction ActionRetargetingAnimationRelative = FUIAction(FExecuteAction::CreateSP(this, &FDisplayedMeshBoneInfo::SetBoneTranslationRetargetingMode, EBoneTranslationRetargetingMode::AnimationRelative));
		MenuBuilder.AddMenuEntry( Enum->GetDisplayNameText(EBoneTranslationRetargetingMode::AnimationRelative), LOCTEXT("BoneTranslationRetargetingAnimationRelativeToolTip", "Use relative translation from animation similar to an additive animation."), FSlateIcon(), ActionRetargetingAnimationRelative);
	}
	MenuBuilder.EndSection();

	return MenuBuilder.MakeWidget();
}

FText FDisplayedMeshBoneInfo::GetTranslationRetargetingModeMenuTitle() const
{
	const USkeleton& Skeleton = GetEditableSkeleton()->GetSkeleton();

	const int32 BoneIndex = Skeleton.GetReferenceSkeleton().FindBoneIndex( BoneName );
	if( BoneIndex != INDEX_NONE )
	{
		const EBoneTranslationRetargetingMode::Type RetargetingMode = Skeleton.GetBoneTranslationRetargetingMode(BoneIndex);
		UEnum* const Enum = FindObject<UEnum>(ANY_PACKAGE, TEXT("EBoneTranslationRetargetingMode"), true);	
		if (Enum)
		{
			return Enum->GetDisplayNameText(RetargetingMode);
		}
	}

	return LOCTEXT("None", "None");
}

void FDisplayedMeshBoneInfo::SetBoneTranslationRetargetingMode(EBoneTranslationRetargetingMode::Type NewRetargetingMode)
{
	GetEditableSkeleton()->SetBoneTranslationRetargetingMode(BoneName, NewRetargetingMode);
}

void FDisplayedMeshBoneInfo::SetBoneBlendProfileScale(float NewScale, bool bRecurse)
{
	FName BlendProfileName = GetSkeletonTree()->GetSelectedBlendProfileName();
	GetEditableSkeleton()->SetBlendProfileScale(BlendProfileName, BoneName, NewScale, bRecurse);
}

FSlateFontInfo FDisplayedMeshBoneInfo::GetBoneTextFont() const
{
	if (bWeightedBone)
	{
		return FEditorStyle::GetWidgetStyle<FTextBlockStyle>("SkeletonTree.BoldFont").Font;
	}
	else
	{
		return FEditorStyle::GetWidgetStyle<FTextBlockStyle>("SkeletonTree.NormalFont").Font;
	}
}

void FDisplayedMeshBoneInfo::CacheLODChange(UDebugSkelMeshComponent* PreviewComponent)
{
	bWeightedBone = false;
	bRequiredBone = false;
	if (PreviewComponent)
	{
		int32 BoneIndex = PreviewComponent->GetBoneIndex(BoneName);

		if (BoneIndex != INDEX_NONE)
		{
			if (GetSkeletonTree()->IsBoneWeighted(BoneIndex, PreviewComponent))
			{
				//Bone is vertex weighted
				bWeightedBone = true;
			}
			if (GetSkeletonTree()->IsBoneRequired(BoneIndex, PreviewComponent))
			{
				bRequiredBone = true;
			}
		}
	}
}

FSlateColor FDisplayedMeshBoneInfo::GetBoneTextColor() const
{
	if (bRequiredBone)
	{
		return FSlateColor(FLinearColor::White);
	}
	else
	{
		return FSlateColor(FLinearColor::Gray);
	}
}

FReply FDisplayedMeshBoneInfo::OnDragDetected(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent)
{
	if ( MouseEvent.IsMouseButtonDown( EKeys::LeftMouseButton ) )
	{
		return FReply::Handled().BeginDragDrop( FBoneDragDropOp::New(GetEditableSkeleton(), BoneName ) );
	}

	return FReply::Unhandled();
}

FText FDisplayedMeshBoneInfo::GetBoneToolTip()
{
	bool bIsMeshBone = false;
	bool bIsWeightedBone = false;
	bool bMeshExists = false;

	FText ToolTip;

	if (GetSkeletonTree()->GetPreviewScene().IsValid())
	{
		UDebugSkelMeshComponent* PreviewComponent = GetSkeletonTree()->GetPreviewScene()->GetPreviewMeshComponent();

		if (PreviewComponent)
		{
			bMeshExists = true;

			int32 BoneIndex = PreviewComponent->GetBoneIndex(BoneName);

			if (BoneIndex != INDEX_NONE)
			{
				bIsMeshBone = true;

				bIsWeightedBone = GetSkeletonTree()->IsBoneWeighted(BoneIndex, PreviewComponent);
			}
		}
	}

	if ( !bMeshExists )
	{
		ToolTip = LOCTEXT( "BoneToolTipNoMeshAvailable", "This bone exists only on the skeleton as there is no current mesh set" );
	}
	else
	{
		if ( !bIsMeshBone )
		{
			ToolTip = LOCTEXT( "BoneToolTipSkeletonOnly", "This bone exists only on the skeleton, but not on the current mesh" );
		}
		else
		{
			if ( !bIsWeightedBone )
			{
				ToolTip = LOCTEXT( "BoneToolTipSkeletonAndMesh", "This bone is used by the current mesh, but has no vertices weighted against it" );
			}
			else
			{
				ToolTip = LOCTEXT( "BoneToolTipWeighted", "This bone has vertices weighted against it" );
			}
		}
	}

	return ToolTip;
}

void FDisplayedMeshBoneInfo::OnBlendSliderCommitted(float NewValue, ETextCommit::Type CommitType)
{
	if(CommitType == ETextCommit::OnEnter)
	{
		SetBoneBlendProfileScale(NewValue, false);
	}
}

//////////////////////////////////////////////////////////////////////////
// FDisplayedSocketInfo

TSharedRef<ITableRow> FDisplayedSocketInfo::MakeTreeRowWidget(
	const TSharedRef<STableViewBase>& InOwnerTable,
	FText InFilterText )
{
	return
		SNew( SSkeletonTreeRow, InOwnerTable )
		.Item( SharedThis(this) )
		.FilterText( InFilterText )
		.SkeletonTree(SkeletonTree)
		.EditableSkeleton(GetEditableSkeleton())
		.OnDraggingItem( this, &FDisplayedSocketInfo::OnDragDetected );
}

void FDisplayedSocketInfo::GenerateWidgetForNameColumn( TSharedPtr< SHorizontalBox > Box, FText& FilterText, FIsSelected InIsSelected )
{
	const FSlateBrush* SocketIcon = ( ParentType == ESocketParentType::Mesh ) ?
		FEditorStyle::GetBrush( "SkeletonTree.MeshSocket" ) :
		FEditorStyle::GetBrush( "SkeletonTree.SkeletonSocket" );

	Box->AddSlot()
	.AutoWidth()
	.Padding(FMargin(0.0f, 1.0f))
	[
		SNew( SImage )
		.ColorAndOpacity(FSlateColor::UseForeground())
		.Image( SocketIcon )
	];

	const FSlateFontInfo TextFont( FPaths::EngineContentDir() / TEXT("Slate/Fonts/Roboto-Regular.ttf" ), 10 );

	FText ToolTip = GetSocketToolTip();

	TAttribute<FText> SocketNameAttr = TAttribute<FText>::Create(TAttribute<FText>::FGetter::CreateSP(this, &FDisplayedSocketInfo::GetSocketNameAsText));
	TSharedPtr< SInlineEditableTextBlock > InlineWidget;

	Box->AddSlot()
	.AutoWidth()
	.Padding(2, 0, 0, 0)
	.VAlign(VAlign_Center)
	[
		SAssignNew( InlineWidget, SInlineEditableTextBlock )
			.ColorAndOpacity( this, &FDisplayedSocketInfo::GetTextColor )
			.Text( SocketNameAttr )
			.HighlightText( FilterText )
			.Font( TextFont )
			.ToolTipText( ToolTip )
			.OnVerifyTextChanged( this, &FDisplayedSocketInfo::OnVerifySocketNameChanged )
			.OnTextCommitted( this, &FDisplayedSocketInfo::OnCommitSocketName )
			.IsSelected( InIsSelected )
	];

	OnRenameRequested.BindSP( InlineWidget.Get(), &SInlineEditableTextBlock::EnterEditingMode);

	if ( ParentType == ESocketParentType::Mesh )
	{
		FText SocketSuffix = IsSocketCustomized() ?
			LOCTEXT( "CustomizedSuffix", " [Mesh]" ) :
			LOCTEXT( "MeshSuffix", " [Mesh Only]" );

		Box->AddSlot()
		.AutoWidth()
		.VAlign(VAlign_Center)
		[
			SNew( STextBlock )
			.ColorAndOpacity( FLinearColor::Gray )
			.Text( SocketSuffix )
			.Font(TextFont)
			.ToolTipText( ToolTip )
		];
	}
}

TSharedRef< SWidget > FDisplayedSocketInfo::GenerateInlineEditWidget(FText& FilterText, FIsSelected InIsSelected)
{
	if (GetDefault<UPersonaOptions>()->bUseInlineSocketEditor)
	{
		FPropertyEditorModule& EditModule = FModuleManager::Get().GetModuleChecked<FPropertyEditorModule>("PropertyEditor");
		FDetailsViewArgs DetailsViewArgs(/*bUpdateFromSelection=*/ false, /*bLockable=*/ false, /*bAllowSearch=*/ false, /*InNameAreaSettings=*/ FDetailsViewArgs::HideNameArea, /*bHideSelectionTip=*/ true);
		DetailsViewArgs.bAllowFavoriteSystem = false;
		DetailsViewArgs.bShowScrollBar = false;
		TSharedRef<IDetailsView> DetailsView = EditModule.CreateDetailView(DetailsViewArgs);
		DetailsView->SetObject(SocketData);

		return SNew(SOverlay)
			.Visibility_Lambda([this]() { return bInlineEditorExpanded ? EVisibility::Visible : EVisibility::Collapsed; })
			+ SOverlay::Slot()
			.Padding(2.0f, 4.0f, 2.0f, 4.0f)
			[
				DetailsView
			]
		+ SOverlay::Slot()
			.HAlign(HAlign_Fill)
			.VAlign(VAlign_Top)
			[
				SNew(SImage)
				.Visibility(EVisibility::HitTestInvisible)
			.Image(FEditorStyle::GetBrush("SkeletonTree.InlineEditorShadowTop"))
			]
		+ SOverlay::Slot()
			.HAlign(HAlign_Fill)
			.VAlign(VAlign_Bottom)
			[
				SNew(SImage)
				.Visibility(EVisibility::HitTestInvisible)
			.Image(FEditorStyle::GetBrush("SkeletonTree.InlineEditorShadowBottom"))
			];
	}
	else
	{
		return SNullWidget::NullWidget;
	}
}

FSlateColor FDisplayedSocketInfo::GetTextColor() const
{
	if (ParentType == ESocketParentType::Skeleton && bIsCustomized)
	{
		return FSlateColor::UseSubduedForeground();
	}
	else
	{
		return FSlateColor::UseForeground();
	}
}

TSharedRef< SWidget > FDisplayedSocketInfo::GenerateWidgetForDataColumn(const FName& DataColumnName)
{
	return SNullWidget::NullWidget;
}

void FDisplayedSocketInfo::OnItemDoubleClicked()
{
	OnRenameRequested.ExecuteIfBound();
}

bool FDisplayedSocketInfo::CanCustomizeSocket() const
{
	// If the socket is on the skeleton, we have a valid mesh
	// and there isn't one of the same name on the mesh, we can customize it
	USkeletalMesh* SkeletalMesh = GetSkeletonTree()->GetPreviewScene().IsValid() ? GetSkeletonTree()->GetPreviewScene()->GetPreviewMeshComponent()->SkeletalMesh : nullptr;
	return (SkeletalMesh && !IsSocketCustomized());
}

void FDisplayedSocketInfo::RequestRename()
{
	OnRenameRequested.ExecuteIfBound();
}

bool FDisplayedSocketInfo::OnVerifySocketNameChanged( const FText& InText, FText& OutErrorMessage )
{
	// You can't have two sockets with the same name on the mesh, nor on the skeleton,
	// but you can have a socket with the same name on the mesh *and* the skeleton.
	bool bVerifyName = true;

	FText NewText = FText::TrimPrecedingAndTrailing(InText);

	if (NewText.IsEmpty())
	{
		OutErrorMessage = LOCTEXT( "EmptySocketName_Error", "Sockets must have a name!");
		bVerifyName = false;
	}
	else
	{
		USkeletalMesh* SkeletalMesh = GetSkeletonTree()->GetPreviewScene().IsValid() ? GetSkeletonTree()->GetPreviewScene()->GetPreviewMeshComponent()->SkeletalMesh : nullptr;
		bVerifyName = !GetEditableSkeleton()->DoesSocketAlreadyExist( SocketData, NewText, ParentType, SkeletalMesh );

		// Needs to be checked on verify.
		if ( !bVerifyName )
		{

			// Tell the user that the socket is a duplicate
			OutErrorMessage = LOCTEXT( "DuplicateSocket_Error", "Socket name in use!");
		}
	}

	return bVerifyName;
}

void FDisplayedSocketInfo::OnCommitSocketName( const FText& InText, ETextCommit::Type CommitInfo )
{
	FText NewText = FText::TrimPrecedingAndTrailing(InText);

	// Notify skeleton tree of socket rename
	USkeletalMesh* SkeletalMesh = GetSkeletonTree()->GetPreviewScene().IsValid() ? GetSkeletonTree()->GetPreviewScene()->GetPreviewMeshComponent()->SkeletalMesh : nullptr;
	GetEditableSkeleton()->RenameSocket(SocketData->SocketName, FName(*NewText.ToString()), SkeletalMesh);
}

FReply FDisplayedSocketInfo::OnDragDetected(const FGeometry& MyGeometry, const FPointerEvent& MouseEvent)
{
	if ( MouseEvent.IsMouseButtonDown( EKeys::LeftMouseButton ) )
	{
		FSelectedSocketInfo SocketInfo( SocketData, ParentType == ESocketParentType::Skeleton );

		return FReply::Handled().BeginDragDrop( FSocketDragDropOp::New( SocketInfo, MouseEvent.IsAltDown() ) );
	}

	return FReply::Unhandled();
}

FText FDisplayedSocketInfo::GetSocketToolTip()
{
	FText ToolTip;

	if ( ParentType == ESocketParentType::Skeleton && bIsCustomized == false )
	{
		ToolTip = LOCTEXT( "SocketToolTipSkeletonOnly", "This socket is on the skeleton only. It is shared with all meshes that use this skeleton" );
	}
	else if ( ParentType == ESocketParentType::Mesh && bIsCustomized == false )
	{
		ToolTip = LOCTEXT( "SocketToolTipMeshOnly", "This socket is on the current mesh only" );
	}
	else if ( ParentType == ESocketParentType::Skeleton )
	{
		ToolTip = LOCTEXT( "SocketToolTipSkeleton", "This socket is on the skeleton (shared with all meshes that use the skeleton), and the current mesh has duplciated version of it" );
	}
	else
	{
		ToolTip = LOCTEXT( "SocketToolTipCustomized", "This socket is on the current mesh, customizing the socket of the same name on the skeleton" );
	}

	return ToolTip;
}

//////////////////////////////////////////////////////////////////////////
// FDisplayedAttachedAssetInfo

TSharedRef<FDisplayedAttachedAssetInfo> FDisplayedAttachedAssetInfo::Make(const FName& InAttachedTo, UObject* InAsset, TWeakPtr<SSkeletonTree> InSkeletonTree)
{
	FDisplayedAttachedAssetInfo* Info = new FDisplayedAttachedAssetInfo(InAttachedTo, InAsset);
	Info->SkeletonTree = InSkeletonTree;

	Info->AssetComponent = PersonaUtils::GetComponentForAttachedObject(InSkeletonTree.Pin()->GetPreviewScene()->GetPreviewMeshComponent(), InAsset, InAttachedTo);

	return MakeShareable(Info);
}

TSharedRef<ITableRow> FDisplayedAttachedAssetInfo::MakeTreeRowWidget(
	const TSharedRef<STableViewBase>& InOwnerTable,
	FText InFilterText )
{
	return
		SNew(SSkeletonTreeRow, InOwnerTable)
		.Item(SharedThis(this))
		.FilterText(InFilterText)
		.SkeletonTree(SkeletonTree)
		.EditableSkeleton(GetEditableSkeleton());
}

void FDisplayedAttachedAssetInfo::GenerateWidgetForNameColumn( TSharedPtr< SHorizontalBox > Box, FText& FilterText, FIsSelected InIsSelected )
{
	UActorFactory* ActorFactory = FActorFactoryAssetProxy::GetFactoryForAssetObject( Asset );
	const FSlateBrush* IconBrush = FSlateIconFinder::FindIconBrushForClass(ActorFactory->GetDefaultActorClass(FAssetData()));
	
	Box->AddSlot()
		.Padding(FMargin(0.0f, 1.0f))
		.AutoWidth()
		[
			SNew( SImage )
			.Image( IconBrush )
		];

	const FSlateFontInfo TextFont( FPaths::EngineContentDir() / TEXT("Slate/Fonts/Roboto-Regular.ttf"), 10 );
	const FLinearColor TextColor(FLinearColor::White);

	Box->AddSlot()
		.AutoWidth()
		[
			SNew( STextBlock )
			.ColorAndOpacity(TextColor)
			.Text( FText::FromString(Asset->GetName()) )
			.HighlightText( FilterText )
			.Font(TextFont)
		];

	Box->AddSlot()
		.AutoWidth()
		.Padding(5.0f,0.0f)
		[
			SNew( STextBlock )
			.ColorAndOpacity( FLinearColor::Gray )
			.Text(LOCTEXT( "AttachedAssetPreviewText", "[Preview Only]" ) )
			.Font(TextFont)
			.ToolTipText( LOCTEXT( "AttachedAssetPreviewText_ToolTip", "Attached assets in Persona are preview only and do not carry through to the game." ) )
		];
}

TSharedRef< SWidget > FDisplayedAttachedAssetInfo::GenerateWidgetForDataColumn(const FName& DataColumnName)
{
	if(DataColumnName == ColumnID_RetargetingLabel)
	{
		return SNew(SHorizontalBox)
			+ SHorizontalBox::Slot()
			.AutoWidth()
			.HAlign(HAlign_Left)
			[
				SNew(SCheckBox)
				.ToolTipText(LOCTEXT("TranslationCheckBoxToolTip", "Click to toggle visibility of this asset"))
				.OnCheckStateChanged(this, &FDisplayedAttachedAssetInfo::OnToggleAssetDisplayed)
				.IsChecked(this, &FDisplayedAttachedAssetInfo::IsAssetDisplayed)
				.Style(FEditorStyle::Get(), "CheckboxLookToggleButtonCheckbox")
				[
					SNew(SImage)
					.Image(this, &FDisplayedAttachedAssetInfo::OnGetAssetDisplayedButtonImage)
					.ColorAndOpacity(FLinearColor::Black)
				]
			];
	}

	return SNullWidget::NullWidget;
}

ECheckBoxState FDisplayedAttachedAssetInfo::IsAssetDisplayed() const
{
	if(AssetComponent.IsValid())
	{
		return AssetComponent->IsVisible() ? ECheckBoxState::Checked : ECheckBoxState::Unchecked;
	}
	return ECheckBoxState::Undetermined;
}

void FDisplayedAttachedAssetInfo::OnToggleAssetDisplayed( ECheckBoxState InCheckboxState )
{
	if(AssetComponent.IsValid())
	{
		AssetComponent->SetVisibility(InCheckboxState == ECheckBoxState::Checked);
	}
}

const FSlateBrush* FDisplayedAttachedAssetInfo::OnGetAssetDisplayedButtonImage() const
{
	return IsAssetDisplayed() == ECheckBoxState::Checked ?
		FEditorStyle::GetBrush( "Kismet.VariableList.ExposeForInstance" ) :
		FEditorStyle::GetBrush( "Kismet.VariableList.HideForInstance" );
}

void FDisplayedAttachedAssetInfo::OnItemDoubleClicked()
{
	TArray<UObject*> AssetsToSync;
	AssetsToSync.Add(Asset);

	FContentBrowserModule& ContentBrowserModule = FModuleManager::Get().LoadModuleChecked<FContentBrowserModule>("ContentBrowser");
	ContentBrowserModule.Get().SyncBrowserToAssets( AssetsToSync );
}

//////////////////////////////////////////////////////////////////////////
// FDisplayedVirtualBoneInfo

TSharedRef<ITableRow> FDisplayedVirtualBoneInfo::MakeTreeRowWidget(
	const TSharedRef<STableViewBase>& OwnerTable,
	FText FilterText)
{
	return
		SNew(SSkeletonTreeRow, OwnerTable)
		.Item(SharedThis(this))
		.FilterText(FilterText)
		.SkeletonTree(SkeletonTree);
}

EVisibility FDisplayedVirtualBoneInfo::GetLODIconVisibility() const
{
	return EVisibility::Visible;
}

void FDisplayedVirtualBoneInfo::GenerateWidgetForNameColumn(TSharedPtr< SHorizontalBox > Box, FText& FilterText, FIsSelected InIsSelected)
{
	const FSlateBrush* LODIcon = FEditorStyle::GetBrush("SkeletonTree.LODBone");

	Box->AddSlot()
		.AutoWidth()
		.Padding(FMargin(0.0f, 1.0f))
		.VAlign(VAlign_Center)
		.HAlign(HAlign_Center)
		[
			SNew(SImage)
			.ColorAndOpacity(FSlateColor::UseForeground())
		.Image(LODIcon)
		.Visibility(this, &FDisplayedVirtualBoneInfo::GetLODIconVisibility)
		];

	FText ToolTip = GetBoneToolTip();
	Box->AddSlot()
		.AutoWidth()
		.Padding(2, 0, 0, 0)
		.VAlign(VAlign_Center)
		[
			SNew(STextBlock)
			.ColorAndOpacity(this, &FDisplayedVirtualBoneInfo::GetBoneTextColor)
		.Text(FText::FromName(BoneName))
		.HighlightText(FilterText)
		.Font(this, &FDisplayedVirtualBoneInfo::GetBoneTextFont)
		.ToolTipText(ToolTip)
		];
}

TSharedRef< SWidget > FDisplayedVirtualBoneInfo::GenerateWidgetForDataColumn(const FName& DataColumnName)
{
	return SNullWidget::NullWidget;
}

FSlateFontInfo FDisplayedVirtualBoneInfo::GetBoneTextFont() const
{
	return FEditorStyle::GetWidgetStyle<FTextBlockStyle>("SkeletonTree.BoldFont").Font;
}

FSlateColor FDisplayedVirtualBoneInfo::GetBoneTextColor() const
{
	return FSlateColor(FLinearColor(0.4f, 0.4f, 1.f));
}

FText FDisplayedVirtualBoneInfo::GetBoneToolTip()
{
	return LOCTEXT("VirtualBone_ToolTip", "Virtual Bones are added in editor and allow space switching between two different bones in the skeleton.");
}

//////////////////////////////////////////////////////////////////////////
// SSkeletonTree

void SSkeletonTree::Construct(const FArguments& InArgs, const TSharedRef<FEditableSkeleton>& InEditableSkeleton, const FSkeletonTreeArgs& InSkeletonTreeArgs)
{
	BoneFilter = EBoneFilter::All;
	SocketFilter = ESocketFilter::Active;
	bShowingAdvancedOptions = false;
	bSelectingSocket = false;
	bSelectingBone = false;
	bDeselectingAll = false;

	EditableSkeleton = InEditableSkeleton;
	PreviewScene = InSkeletonTreeArgs.PreviewScene;
	IsEditable = InArgs._IsEditable;

	SetPreviewComponentSocketFilter();

	// Register delegates
	InSkeletonTreeArgs.OnPostUndo.Add(FSimpleDelegate::CreateSP(this, &SSkeletonTree::PostUndo));

	PreviewScene->RegisterOnLODChanged(FSimpleDelegate::CreateSP(this, &SSkeletonTree::OnLODSwitched));

	InEditableSkeleton->RegisterOnSkeletonHierarchyChanged(USkeleton::FOnSkeletonHierarchyChanged::CreateSP(this, &SSkeletonTree::PostUndo));

	RegisterOnObjectSelected(InSkeletonTreeArgs.OnObjectSelected);

	// Register and bind all our menu commands
	FSkeletonTreeCommands::Register();
	BindCommands();

	this->ChildSlot
	[
		SNew( SVerticalBox )
		
		+ SVerticalBox::Slot()
		.AutoHeight()
		.Padding( FMargin( 0.0f, 0.0f, 0.0f, 4.0f ) )
		[
			SAssignNew( NameFilterBox, SSearchBox )
			.SelectAllTextWhenFocused( true )
			.OnTextChanged( this, &SSkeletonTree::OnFilterTextChanged )
			.HintText( LOCTEXT( "SearchBoxHint", "Search Skeleton Tree...") )
			.AddMetaData<FTagMetaData>(TEXT("SkelTree.Search"))
		]

		+ SVerticalBox::Slot()
		.Padding( FMargin( 0.0f, 4.0f, 0.0f, 0.0f ) )
		[
			SAssignNew(TreeHolder, SOverlay)
		]

		+ SVerticalBox::Slot()
		.AutoHeight()
		[
			SNew( SHorizontalBox )

			+ SHorizontalBox::Slot()
			.Padding(0.0f, 0.0f, 2.0f, 0.0f)
			.VAlign(VAlign_Center)
			.HAlign(HAlign_Left)
			.FillWidth(1.0f)
			[
				SNew(SHorizontalBox)
				
				+ SHorizontalBox::Slot()
				.Padding(0.0f, 0.0f, 2.0f, 0.0f)
				.VAlign(VAlign_Center)
				[
					SAssignNew(BlendProfilePicker, SBlendProfilePicker, GetEditableSkeleton())
					.Standalone(true)
					.OnBlendProfileSelected(this, &SSkeletonTree::OnBlendProfileSelected)
				]
			]

			+ SHorizontalBox::Slot()
			.Padding( 0.0f, 0.0f, 2.0f, 0.0f )
			.VAlign(VAlign_Center)
			.HAlign(HAlign_Right)
			.AutoWidth()
			[
				SAssignNew( FilterComboButton, SComboButton )
				.ButtonStyle(FEditorStyle::Get(), "ToggleButton")
				.ForegroundColor(this, &SSkeletonTree::GetFilterComboButtonForegroundColor)
				.ContentPadding(0.0f)
				.OnGetMenuContent( this, &SSkeletonTree::CreateFilterMenu )
				.ToolTipText( LOCTEXT( "BoneFilterToolTip", "Change which types of bones and sockets are shown, retargeting options" ) )
				.AddMetaData<FTagMetaData>(TEXT("SkelTree.Bones"))
				.ButtonContent()
				[
					SNew(SHorizontalBox)
					+SHorizontalBox::Slot()
					.AutoWidth()
					.VAlign(VAlign_Center)
					[
						SNew(SImage).Image( FEditorStyle::GetBrush("GenericViewButton") )
					]
					+SHorizontalBox::Slot()
					.AutoWidth()
					.Padding(2, 0, 0, 0)
					.VAlign(VAlign_Center)
					[
						SNew( STextBlock )
						.Text( this, &SSkeletonTree::GetFilterMenuTitle )
					]
				]
			]
		]
	];

	CreateTreeColumns();

	OnLODSwitched();
}

SSkeletonTree::~SSkeletonTree()
{
	if (EditableSkeleton.IsValid())
	{
		EditableSkeleton.Pin()->UnregisterOnSkeletonHierarchyChanged(this);
	}
}

void SSkeletonTree::BindCommands()
{
	// This should not be called twice on the same instance
	check( !UICommandList.IsValid() );

	UICommandList = MakeShareable( new FUICommandList );

	FUICommandList& CommandList = *UICommandList;

	// Grab the list of menu commands to bind...
	const FSkeletonTreeCommands& MenuActions = FSkeletonTreeCommands::Get();

	// ...and bind them all

	// Bone Filter commands
	CommandList.MapAction(
		MenuActions.ShowAllBones,
		FExecuteAction::CreateSP( this, &SSkeletonTree::SetBoneFilter, EBoneFilter::All ),
		FCanExecuteAction(),
		FIsActionChecked::CreateSP( this, &SSkeletonTree::IsBoneFilter, EBoneFilter::All ) );

	CommandList.MapAction(
		MenuActions.ShowMeshBones,
		FExecuteAction::CreateSP( this, &SSkeletonTree::SetBoneFilter, EBoneFilter::Mesh ),
		FCanExecuteAction(),
		FIsActionChecked::CreateSP( this, &SSkeletonTree::IsBoneFilter, EBoneFilter::Mesh ) );

	CommandList.MapAction(
		MenuActions.ShowLODBones,
		FExecuteAction::CreateSP(this, &SSkeletonTree::SetBoneFilter, EBoneFilter::LOD),
		FCanExecuteAction(),
		FIsActionChecked::CreateSP(this, &SSkeletonTree::IsBoneFilter, EBoneFilter::LOD));
	
	CommandList.MapAction(
		MenuActions.ShowWeightedBones,
		FExecuteAction::CreateSP( this, &SSkeletonTree::SetBoneFilter, EBoneFilter::Weighted ),
		FCanExecuteAction(),
		FIsActionChecked::CreateSP( this, &SSkeletonTree::IsBoneFilter, EBoneFilter::Weighted ) );

	CommandList.MapAction(
		MenuActions.HideBones,
		FExecuteAction::CreateSP( this, &SSkeletonTree::SetBoneFilter, EBoneFilter::None ),
		FCanExecuteAction(),
		FIsActionChecked::CreateSP( this, &SSkeletonTree::IsBoneFilter, EBoneFilter::None ) );

	// Socket filter commands
	CommandList.MapAction(
		MenuActions.ShowActiveSockets,
		FExecuteAction::CreateSP( this, &SSkeletonTree::SetSocketFilter, ESocketFilter::Active ),
		FCanExecuteAction(),
		FIsActionChecked::CreateSP( this, &SSkeletonTree::IsSocketFilter, ESocketFilter::Active ) );

	CommandList.MapAction(
		MenuActions.ShowMeshSockets,
		FExecuteAction::CreateSP( this, &SSkeletonTree::SetSocketFilter, ESocketFilter::Mesh ),
		FCanExecuteAction(),
		FIsActionChecked::CreateSP( this, &SSkeletonTree::IsSocketFilter, ESocketFilter::Mesh ) );

	CommandList.MapAction(
		MenuActions.ShowSkeletonSockets,
		FExecuteAction::CreateSP( this, &SSkeletonTree::SetSocketFilter, ESocketFilter::Skeleton ),
		FCanExecuteAction(),
		FIsActionChecked::CreateSP( this, &SSkeletonTree::IsSocketFilter, ESocketFilter::Skeleton ) );

	CommandList.MapAction(
		MenuActions.ShowAllSockets,
		FExecuteAction::CreateSP( this, &SSkeletonTree::SetSocketFilter, ESocketFilter::All ),
		FCanExecuteAction(),
		FIsActionChecked::CreateSP( this, &SSkeletonTree::IsSocketFilter, ESocketFilter::All ) );

	CommandList.MapAction(
		MenuActions.HideSockets,
		FExecuteAction::CreateSP( this, &SSkeletonTree::SetSocketFilter, ESocketFilter::None ),
		FCanExecuteAction(),
		FIsActionChecked::CreateSP( this, &SSkeletonTree::IsSocketFilter, ESocketFilter::None ) );

	CommandList.MapAction(
		MenuActions.ShowRetargeting,
		FExecuteAction::CreateSP(this, &SSkeletonTree::OnChangeShowingAdvancedOptions),
		FCanExecuteAction(),
		FIsActionChecked::CreateSP(this, &SSkeletonTree::IsShowingAdvancedOptions));

	// Socket manipulation commands
	CommandList.MapAction(
		MenuActions.AddSocket,
		FExecuteAction::CreateSP( this, &SSkeletonTree::OnAddSocket ),
		FCanExecuteAction::CreateSP( this, &SSkeletonTree::IsAddingSocketsAllowed ) );

	CommandList.MapAction(
		FGenericCommands::Get().Rename,
		FExecuteAction::CreateSP( this, &SSkeletonTree::OnRenameSocket ),
		FCanExecuteAction::CreateSP( this, &SSkeletonTree::CanRenameSelected ) );

	CommandList.MapAction(
		MenuActions.CreateMeshSocket,
		FExecuteAction::CreateSP( this, &SSkeletonTree::OnCustomizeSocket ) );

	CommandList.MapAction(
		MenuActions.RemoveMeshSocket,
		FExecuteAction::CreateSP( this, &SSkeletonTree::OnDeleteSelectedRows ) ); // Removing customization just deletes the mesh socket

	CommandList.MapAction(
		MenuActions.PromoteSocketToSkeleton,
		FExecuteAction::CreateSP( this, &SSkeletonTree::OnPromoteSocket ) ); // Adding customization just deletes the mesh socket

	CommandList.MapAction(
		MenuActions.DeleteSelectedRows,
		FExecuteAction::CreateSP( this, &SSkeletonTree::OnDeleteSelectedRows ) );

	CommandList.MapAction(
		MenuActions.CopyBoneNames,
		FExecuteAction::CreateSP( this, &SSkeletonTree::OnCopyBoneNames ) );

	CommandList.MapAction(
		MenuActions.ResetBoneTransforms,
		FExecuteAction::CreateSP(this, &SSkeletonTree::OnResetBoneTransforms ) );

	CommandList.MapAction(
		MenuActions.CopySockets,
		FExecuteAction::CreateSP( this, &SSkeletonTree::OnCopySockets ) );

	CommandList.MapAction(
		MenuActions.PasteSockets,
		FExecuteAction::CreateSP( this, &SSkeletonTree::OnPasteSockets, false ) );

	CommandList.MapAction(
		MenuActions.PasteSocketsToSelectedBone,
		FExecuteAction::CreateSP(this, &SSkeletonTree::OnPasteSockets, true));
}

TSharedRef<ITableRow> SSkeletonTree::MakeTreeRowWidget(TSharedPtr<FDisplayedTreeRowInfo> InInfo, const TSharedRef<STableViewBase>& OwnerTable)
{
	check( InInfo.IsValid() );
	
	return InInfo->MakeTreeRowWidget( OwnerTable, FilterText );
}

void SSkeletonTree::GetChildrenForInfo(TSharedPtr<FDisplayedTreeRowInfo> InInfo, TArray< TSharedPtr<FDisplayedTreeRowInfo> >& OutChildren)
{
	check(InInfo.IsValid());
	OutChildren = InInfo->Children;
}

bool SSkeletonTree::AttachToParent( TSharedRef<FDisplayedTreeRowInfo> ItemToAttach, FName ParentName, int32 ItemsToInclude)
{
	// Find the parent info
	for (int32 BoneIndex = 0; BoneIndex < DisplayMirror.Num(); ++BoneIndex)
	{
		TSharedRef<FDisplayedTreeRowInfo> CurrentItem = DisplayMirror[BoneIndex];
		
		// does the item match our filter
		if ( (ItemsToInclude & (int32)CurrentItem->GetType()) != 0 )
		{
			if ( CurrentItem->GetRowItemName() == ParentName )
			{
				CurrentItem->Children.Insert( ItemToAttach, 0 );
				return true;
			}
		}
	}
	return false;
}

void SSkeletonTree::CreateTreeColumns()
{
	TSharedRef<SHeaderRow> TreeHeaderRow = SNew(SHeaderRow)
		+ SHeaderRow::Column(ColumnID_BoneLabel)
		.DefaultLabel(LOCTEXT("SkeletonBoneNameLabel", "Name"))
		.FillWidth(0.5f);

	if (bShowingAdvancedOptions)
	{
		TreeHeaderRow->AddColumn(
			SHeaderRow::Column(ColumnID_RetargetingLabel)
			.DefaultLabel(LOCTEXT("SkeletonBoneTranslationRetargetingLabel", "Translation Retargeting"))
			.FillWidth(0.25f)
			);
	}

	if(BlendProfilePicker->GetSelectedBlendProfileName() != NAME_None)
	{
		TreeHeaderRow->AddColumn(
			SHeaderRow::Column(ColumnID_BlendProfileLabel)
			.DefaultLabel(LOCTEXT("BlendProfileLabel", "Blend Profile Scale"))
			.FillWidth(0.25f));
	}

	SAssignNew(SkeletonTreeView, SMeshSkeletonTreeRowType)
		.TreeItemsSource(&SkeletonRowList)
		.OnGenerateRow(this, &SSkeletonTree::MakeTreeRowWidget)
		.OnGetChildren(this, &SSkeletonTree::GetChildrenForInfo)
		.OnContextMenuOpening(this, &SSkeletonTree::CreateContextMenu)
		.OnSelectionChanged(this, &SSkeletonTree::OnSelectionChanged)
		.OnItemScrolledIntoView(this, &SSkeletonTree::OnItemScrolledIntoView)
		.OnMouseButtonDoubleClick(this, &SSkeletonTree::OnTreeDoubleClick)
		.OnSetExpansionRecursive(this, &SSkeletonTree::SetTreeItemExpansionRecursive)
		.ItemHeight(24)
		.HeaderRow
		(
			TreeHeaderRow
		);

	TreeHolder->ClearChildren();
	TreeHolder->AddSlot()
	[
		SNew(SScrollBorder, SkeletonTreeView.ToSharedRef())
		[
			SkeletonTreeView.ToSharedRef()
		]
	];

	CreateFromSkeleton();
}


void SSkeletonTree::CreateFromSkeleton(USkeletalMeshSocket* SocketToRename /*= nullptr*/)
{
	const USkeleton& Skeleton = GetEditableSkeletonInternal()->GetSkeleton();
	
	SkeletonRowList.Empty();

	const FReferenceSkeleton& RefSkeleton = Skeleton.GetReferenceSkeleton();

	DisplayMirror.Empty( RefSkeleton.GetNum() );

	if( BoneFilter != EBoneFilter::None )
	{
		for (int32 BoneIndex = 0; BoneIndex < RefSkeleton.GetRawBoneNum(); ++BoneIndex)
		{
			const FName& BoneName = RefSkeleton.GetBoneName(BoneIndex);
			if ( !FilterText.IsEmpty() && !BoneName.ToString().Contains( FilterText.ToString()) )
			{
				continue;
			}
		
			if (GetPreviewScene().IsValid())
			{
				UDebugSkelMeshComponent* PreviewMeshComponent = GetPreviewScene()->GetPreviewMeshComponent();
				if (PreviewMeshComponent)
				{
					int32 BoneMeshIndex = PreviewMeshComponent->GetBoneIndex(BoneName);

					// Remove non-mesh bones if we're filtering
					if ((BoneFilter == EBoneFilter::Mesh || BoneFilter == EBoneFilter::Weighted || BoneFilter == EBoneFilter::LOD) &&
						BoneMeshIndex == INDEX_NONE)
					{
						continue;
					}

					// Remove non-vertex-weighted bones if we're filtering
					if (BoneFilter == EBoneFilter::Weighted && !IsBoneWeighted(BoneMeshIndex, PreviewMeshComponent))
					{
						continue;
					}

					// Remove non-vertex-weighted bones if we're filtering
					if (BoneFilter == EBoneFilter::LOD && !IsBoneRequired(BoneMeshIndex, PreviewMeshComponent))
					{
						continue;
					}
				}
			}

			int32 ParentIndex = RefSkeleton.GetParentIndex(BoneIndex);

			TSharedRef<FDisplayedMeshBoneInfo> DisplayBone = FDisplayedMeshBoneInfo::Make( RefSkeleton.GetBoneName(BoneIndex), SharedThis(this) );
		
			if ( BoneIndex > 0 && FilterText.IsEmpty() && DisplayMirror.Num() != 0 )	// No hierarchy when filtertext is non-empty
			{
				check(ParentIndex < BoneIndex);

				// We support filtering the list, so ParentIndex isn't necessarily correct in the DisplayMirror any more, so we need to search for it by name
				FName ParentName = RefSkeleton.GetBoneName(ParentIndex);
				bool bFoundRemappedParentIndex = false;

				for ( int32 i = 0; i < DisplayMirror.Num(); ++i )
				{
					FDisplayedTreeRowInfoPtr TreeRowInfo = DisplayMirror[i];

					// At this point, we can assume that *all* of DisplayMirror contains bones, not sockets
					check( TreeRowInfo->GetType() == ESkeletonTreeRowType::Bone );

					if ( *static_cast<FName*>( TreeRowInfo->GetData() ) == ParentName )
					{
						ParentIndex = i;
						bFoundRemappedParentIndex = true;
						break;
					}
				}

				if ( bFoundRemappedParentIndex )
				{
					DisplayMirror[ParentIndex]->Children.Add(DisplayBone);
				}
				else
				{
					// The parent bone didn't pass the filter, so just add this bone to the base of the tree
					SkeletonRowList.Add(DisplayBone);
				}
			}
 			else
			{
				SkeletonRowList.Add(DisplayBone);
			}

			DisplayMirror.Add(DisplayBone);
			SkeletonTreeView->SetItemExpansion(DisplayBone, true);
		}
	}

	// Add the sockets for the skeleton
	if ( SocketFilter == ESocketFilter::Active || SocketFilter == ESocketFilter::All || SocketFilter == ESocketFilter::Skeleton )
	{
		AddSocketsFromData( Skeleton.Sockets, ESocketParentType::Skeleton, SocketToRename );
	}
	
	USkeletalMesh* SkeletalMesh = GetPreviewScene().IsValid() ? GetPreviewScene()->GetPreviewMeshComponent()->SkeletalMesh : nullptr;
	if ( SocketFilter == ESocketFilter::Active || SocketFilter == ESocketFilter::All || SocketFilter == ESocketFilter::Mesh )
	{
		// Add the sockets for the mesh
		if (SkeletalMesh)
		{
			AddSocketsFromData( SkeletalMesh->GetMeshOnlySocketList(), ESocketParentType::Mesh, SocketToRename );
		}
	}

	//Add the attached mesh items last, these are the most child like of all the items that can go in the skeleton tree

	// Mesh attached items...
	if (SkeletalMesh)
	{
		AddAttachedAssets( SkeletalMesh->PreviewAttachedAssetContainer );
	}

	if (BoneFilter != EBoneFilter::None)
	{
		AddVirtualBones(Skeleton.GetVirtualBones());
	}

	// ...skeleton attached items
	AddAttachedAssets( Skeleton.PreviewAttachedAssetContainer );

	SkeletonTreeView->RequestTreeRefresh();
}

void SSkeletonTree::AddSocketsFromData(const TArray< USkeletalMeshSocket* >& SocketArray, ESocketParentType ParentType, USkeletalMeshSocket* SocketToRename)
{
	const USkeleton& Skeleton = GetEditableSkeletonInternal()->GetSkeleton();

	for (auto SocketIt = SocketArray.CreateConstIterator(); SocketIt; ++SocketIt)
	{
		USkeletalMeshSocket* Socket = *(SocketIt);

		if (!FilterText.IsEmpty() && !Socket->SocketName.ToString().Contains(FilterText.ToString()))
		{
			continue;
		}

		bool bIsCustomized = false;

		USkeletalMesh* SkeletalMesh = GetPreviewScene().IsValid() ? GetPreviewScene()->GetPreviewMeshComponent()->SkeletalMesh : nullptr;
		if (ParentType == ESocketParentType::Mesh)
		{
			bIsCustomized = GetEditableSkeletonInternal()->DoesSocketAlreadyExist(NULL, FText::FromName(Socket->SocketName), ESocketParentType::Skeleton, SkeletalMesh);
		}
		else
		{
			if (SkeletalMesh)
			{
				bIsCustomized = GetEditableSkeletonInternal()->DoesSocketAlreadyExist(NULL, FText::FromName(Socket->SocketName), ESocketParentType::Mesh, SkeletalMesh);

				if (SocketFilter == ESocketFilter::Active && bIsCustomized)
				{
					// Don't add the skeleton socket if it's already added for the mesh
					continue;
				}
			}
		}

		TSharedRef<FDisplayedSocketInfo> DisplaySocket = FDisplayedSocketInfo::Make(Socket, ParentType, SharedThis(this), bIsCustomized);

		if (Socket == SocketToRename)
		{
			SkeletonTreeView->SetSelection(DisplaySocket);
			OnRenameSocket();
		}
		DisplayMirror.Add(DisplaySocket);

		if (!AttachToParent(DisplaySocket, Socket->BoneName, (int32)ESkeletonTreeRowType::Bone))
		{
			// Just add it to the list if the parent bone isn't currently displayed
			SkeletonRowList.Add(DisplaySocket);
		}

		SkeletonTreeView->SetItemExpansion(DisplaySocket, true);
	}
}

void SSkeletonTree::AddVirtualBones(const TArray<FVirtualBone>& VirtualBones)
{
	for (const FVirtualBone& VirtualBone: VirtualBones)
	{
		if (!FilterText.IsEmpty() && !VirtualBone.VirtualBoneName.ToString().Contains(FilterText.ToString()))
		{
			continue;
		}

		TSharedRef<FDisplayedVirtualBoneInfo> DisplayBone = FDisplayedVirtualBoneInfo::Make(VirtualBone.VirtualBoneName, SharedThis(this));
		
		DisplayMirror.Add(DisplayBone);

		if (!AttachToParent(DisplayBone, VirtualBone.SourceBoneName, (int32)ESkeletonTreeRowType::Bone))
		{
			// Just add it to the list if the parent bone isn't currently displayed
			SkeletonRowList.Add(DisplayBone);
		}

		SkeletonTreeView->SetItemExpansion(DisplayBone, true);
	}
}

class FBoneTreeSelection
{
public:
	TArray<TSharedPtr<FDisplayedTreeRowInfo>> SelectedItems;

	TArray<TSharedPtr<FDisplayedMeshBoneInfo>> SelectedBones;
	TArray<TSharedPtr<FDisplayedSocketInfo>> SelectedSockets;
	TArray<TSharedPtr<FDisplayedAttachedAssetInfo>> SelectedAssets;
	TArray<TSharedPtr<FDisplayedVirtualBoneInfo>> SelectedVirtualBones;

	FBoneTreeSelection(TArray<TSharedPtr<FDisplayedTreeRowInfo>> InSelectedItems) : SelectedItems(InSelectedItems)
	{
		for ( auto ItemIt = SelectedItems.CreateConstIterator(); ItemIt; ++ItemIt )
		{
			FDisplayedTreeRowInfoPtr Item = *(ItemIt);

			switch(Item->GetType())
			{
				case ESkeletonTreeRowType::Bone:
				{
					SelectedBones.Add( StaticCastSharedPtr< FDisplayedMeshBoneInfo >(Item) );
					break;
				}
				case ESkeletonTreeRowType::Socket:
				{
					SelectedSockets.Add( StaticCastSharedPtr< FDisplayedSocketInfo >(Item) );
					break;
				}
				case ESkeletonTreeRowType::AttachedAsset:
				{
					SelectedAssets.Add( StaticCastSharedPtr< FDisplayedAttachedAssetInfo >(Item) );
					break;
				}
				case ESkeletonTreeRowType::VirtualBone:
				{
					SelectedVirtualBones.Add(StaticCastSharedPtr< FDisplayedVirtualBoneInfo >(Item));
					break;
				}
				default:
				{
					check(false); // Unknown row type!
				}
			}
		}
	}

	bool IsMultipleItemsSelected() const
	{
		return SelectedItems.Num() > 1;
	}

	bool IsSingleItemSelected() const
	{
		return SelectedItems.Num() == 1;
	}

	bool IsSingleOfTypeSelected(ESkeletonTreeRowType ItemType) const
	{
		if(IsSingleItemSelected())
		{
			return GetNumSelected(ItemType) == 1;
		}
		return false;
	}

	TSharedPtr<FDisplayedTreeRowInfo> GetSingleSelectedItem()
	{
		check(IsSingleItemSelected());
		return SelectedItems[0];
	}

	bool HasSelectedOfType(ESkeletonTreeRowType ItemType) const
	{
		return GetNumSelected(ItemType) > 0;
	}

	int32 GetNumSelected(ESkeletonTreeRowType ItemType) const
	{
		switch (ItemType)
		{
			case ESkeletonTreeRowType::Bone:
			{
				return SelectedBones.Num();
			}
			case ESkeletonTreeRowType::Socket:
			{
				return SelectedSockets.Num();
			}
			case ESkeletonTreeRowType::AttachedAsset:
			{
				return SelectedAssets.Num();
			}
			case ESkeletonTreeRowType::VirtualBone:
			{
				return SelectedVirtualBones.Num();
			}
			default:
			{
				check(false); // Unknown type
			}
		}
		return 0;
	}
};

TSharedPtr< SWidget > SSkeletonTree::CreateContextMenu()
{
	const FSkeletonTreeCommands& Actions = FSkeletonTreeCommands::Get();

	FBoneTreeSelection BoneTreeSelection(SkeletonTreeView->GetSelectedItems());

	const bool CloseAfterSelection = true;
	FMenuBuilder MenuBuilder( CloseAfterSelection, UICommandList );
	{
		if(BoneTreeSelection.HasSelectedOfType(ESkeletonTreeRowType::AttachedAsset) || BoneTreeSelection.HasSelectedOfType(ESkeletonTreeRowType::Socket) || BoneTreeSelection.HasSelectedOfType(ESkeletonTreeRowType::VirtualBone))
		{
			MenuBuilder.BeginSection("SkeletonTreeSelectedItemsActions", LOCTEXT( "SelectedActions", "Selected Item Actions" ) );
			MenuBuilder.AddMenuEntry( Actions.DeleteSelectedRows );
			MenuBuilder.EndSection();
		}

		if(BoneTreeSelection.HasSelectedOfType(ESkeletonTreeRowType::Bone))
		{
			MenuBuilder.BeginSection("SkeletonTreeBonesAction", LOCTEXT( "BoneActions", "Selected Bone Actions" ) );
			MenuBuilder.AddMenuEntry( Actions.CopyBoneNames );
			MenuBuilder.AddMenuEntry( Actions.ResetBoneTransforms );

			if(BoneTreeSelection.IsSingleOfTypeSelected(ESkeletonTreeRowType::Bone))
			{
				MenuBuilder.AddMenuEntry( Actions.AddSocket );
				MenuBuilder.AddMenuEntry( Actions.PasteSockets );
				MenuBuilder.AddMenuEntry( Actions.PasteSocketsToSelectedBone );
			}

			MenuBuilder.AddSubMenu(LOCTEXT("AddVirtualBone", "Add Virtual Bone"),
				LOCTEXT("AddVirtualBone_ToolTip", "Adds a virtual bone to the skeleton."),
				FNewMenuDelegate::CreateSP(this, &SSkeletonTree::FillVirtualBoneSubmenu, BoneTreeSelection.SelectedBones));

			MenuBuilder.EndSection();

			UBlendProfile* const SelectedBlendProfile = BlendProfilePicker->GetSelectedBlendProfile();
			if(SelectedBlendProfile && BoneTreeSelection.IsSingleOfTypeSelected(ESkeletonTreeRowType::Bone))
			{
				TSharedPtr<FDisplayedMeshBoneInfo> BoneInfo = BoneTreeSelection.SelectedBones[0];

				FName BoneName = *static_cast<FName*>(BoneInfo->GetData());
				const USkeleton& Skeleton = GetEditableSkeletonInternal()->GetSkeleton();
				int32 BoneIndex = Skeleton.GetReferenceSkeleton().FindBoneIndex(BoneName);

				float CurrentBlendScale = SelectedBlendProfile->GetBoneBlendScale(BoneIndex);

				MenuBuilder.BeginSection("SkeletonTreeBlendProfileScales", LOCTEXT("BlendProfileContextOptions", "Blend Profile"));
				{
					FUIAction RecursiveSetScales;
					RecursiveSetScales.ExecuteAction = FExecuteAction::CreateSP(this, &SSkeletonTree::RecursiveSetBlendProfileScales, CurrentBlendScale);
					
					MenuBuilder.AddMenuEntry
						(
						FText::Format(LOCTEXT("RecursiveSetBlendScales_Label", "Recursively Set Blend Scales To {0}"), FText::AsNumber(CurrentBlendScale)),
						LOCTEXT("RecursiveSetBlendScales_ToolTip", "Sets all child bones to use the same blend profile scale as the selected bone"),
						FSlateIcon(),
						RecursiveSetScales
						);
				}
				MenuBuilder.EndSection();
			}

			if(bShowingAdvancedOptions)
			{
				MenuBuilder.BeginSection("SkeletonTreeBoneTranslationRetargeting", LOCTEXT("BoneTranslationRetargetingHeader", "Bone Translation Retargeting"));
				{
					FUIAction RecursiveRetargetingSkeletonAction = FUIAction(FExecuteAction::CreateSP(this, &SSkeletonTree::SetBoneTranslationRetargetingModeRecursive, EBoneTranslationRetargetingMode::Skeleton));
					FUIAction RecursiveRetargetingAnimationAction = FUIAction(FExecuteAction::CreateSP(this, &SSkeletonTree::SetBoneTranslationRetargetingModeRecursive, EBoneTranslationRetargetingMode::Animation));
					FUIAction RecursiveRetargetingAnimationScaledAction = FUIAction(FExecuteAction::CreateSP(this, &SSkeletonTree::SetBoneTranslationRetargetingModeRecursive, EBoneTranslationRetargetingMode::AnimationScaled));
					FUIAction RecursiveRetargetingAnimationRelativeAction = FUIAction(FExecuteAction::CreateSP(this, &SSkeletonTree::SetBoneTranslationRetargetingModeRecursive, EBoneTranslationRetargetingMode::AnimationRelative));

					MenuBuilder.AddMenuEntry
						(LOCTEXT("SetTranslationRetargetingSkeletonChildrenAction", "Recursively Set Translation Retargeting Skeleton")
						, LOCTEXT("BoneTranslationRetargetingSkeletonToolTip", "Use translation from Skeleton.")
						, FSlateIcon()
						, RecursiveRetargetingSkeletonAction
						);

					MenuBuilder.AddMenuEntry
						(LOCTEXT("SetTranslationRetargetingAnimationChildrenAction", "Recursively Set Translation Retargeting Animation")
						, LOCTEXT("BoneTranslationRetargetingAnimationToolTip", "Use translation from animation.")
						, FSlateIcon()
						, RecursiveRetargetingAnimationAction
						);

					MenuBuilder.AddMenuEntry
						(LOCTEXT("SetTranslationRetargetingAnimationScaledChildrenAction", "Recursively Set Translation Retargeting AnimationScaled")
						, LOCTEXT("BoneTranslationRetargetingAnimationScaledToolTip", "Use translation from animation, scale length by Skeleton's proportions.")
						, FSlateIcon()
						, RecursiveRetargetingAnimationScaledAction
						);

					MenuBuilder.AddMenuEntry
						(LOCTEXT("SetTranslationRetargetingAnimationRelativeChildrenAction", "Recursively Set Translation Retargeting AnimationRelative")
						, LOCTEXT("BoneTranslationRetargetingAnimationRelativeToolTip", "Use relative translation from animation similar to an additive animation.")
						, FSlateIcon()
						, RecursiveRetargetingAnimationRelativeAction
						);
				}
				MenuBuilder.EndSection();
			}

			MenuBuilder.BeginSection("SkeletonTreeBoneReductionForLOD", LOCTEXT("BoneReductionHeader", "LOD Bone Reduction"));
			{
				MenuBuilder.AddSubMenu(
					LOCTEXT("SkeletonTreeBoneReductionForLOD_RemoveSelectedFromLOD", "Remove Selected..."),
					FText::GetEmpty(),
					FNewMenuDelegate::CreateStatic(&SSkeletonTree::CreateMenuForBoneReduction, this, LastCachedLODForPreviewMeshComponent, true)
					);

				MenuBuilder.AddSubMenu(
					LOCTEXT("SkeletonTreeBoneReductionForLOD_RemoveChildrenFromLOD", "Remove Children..."),
					FText::GetEmpty(),
					FNewMenuDelegate::CreateStatic(&SSkeletonTree::CreateMenuForBoneReduction, this, LastCachedLODForPreviewMeshComponent, false)
					);
			}
			MenuBuilder.EndSection();
		}

		if(BoneTreeSelection.HasSelectedOfType(ESkeletonTreeRowType::Socket))
		{
			MenuBuilder.BeginSection("SkeletonTreeSocketsActions", LOCTEXT( "SocketActions", "Selected Socket Actions" ) );

			MenuBuilder.AddMenuEntry( Actions.CopySockets );

			if(BoneTreeSelection.IsSingleOfTypeSelected(ESkeletonTreeRowType::Socket))
			{
				MenuBuilder.AddMenuEntry( FGenericCommands::Get().Rename, NAME_None, LOCTEXT("RenameSocket_Label", "Rename Socket"), LOCTEXT("RenameSocket_Tooltip", "Rename this socket") );

				FDisplayedSocketInfo* DisplayedSocketInfo = static_cast< FDisplayedSocketInfo* >( BoneTreeSelection.GetSingleSelectedItem().Get() );

				if ( DisplayedSocketInfo->IsSocketCustomized() && DisplayedSocketInfo->GetParentType() == ESocketParentType::Mesh )
				{
					MenuBuilder.AddMenuEntry( Actions.RemoveMeshSocket );
				}

				USkeletalMeshSocket* SelectedSocket = static_cast< USkeletalMeshSocket* >( DisplayedSocketInfo->GetData() );

				// If the socket is on the skeleton, we have a valid mesh
				// and there isn't one of the same name on the mesh, we can customize it
				if ( DisplayedSocketInfo->CanCustomizeSocket() )
				{
					if ( DisplayedSocketInfo->GetParentType() == ESocketParentType::Skeleton )
					{
						MenuBuilder.AddMenuEntry( Actions.CreateMeshSocket );
					}
					else if ( DisplayedSocketInfo->GetParentType() == ESocketParentType::Mesh )
					{
						// If a socket is on the mesh only, then offer to promote it to the skeleton
						MenuBuilder.AddMenuEntry( Actions.PromoteSocketToSkeleton );
					}
				}
			}

			MenuBuilder.EndSection();
		}

		MenuBuilder.BeginSection("SkeletonTreeAttachedAssets", LOCTEXT( "AttachedAssetsActionsHeader", "Attached Assets Actions" ) );

		if ( BoneTreeSelection.IsSingleItemSelected() )
		{
			MenuBuilder.AddSubMenu(	LOCTEXT( "AttachNewAsset", "Add Preview Asset" ),
				LOCTEXT ( "AttachNewAsset_ToolTip", "Attaches an asset to this part of the skeleton. Assets can also be dragged onto the skeleton from a content browser to attach" ),
				FNewMenuDelegate::CreateSP( this, &SSkeletonTree::FillAttachAssetSubmenu, BoneTreeSelection.GetSingleSelectedItem() ) );
		}

		FUIAction RemoveAllAttachedAssets = FUIAction(	FExecuteAction::CreateSP( this, &SSkeletonTree::OnRemoveAllAssets ),
			FCanExecuteAction::CreateSP( this, &SSkeletonTree::CanRemoveAllAssets ));

		MenuBuilder.AddMenuEntry( LOCTEXT( "RemoveAllAttachedAssets", "Remove All Attached Assets" ),
			LOCTEXT ( "RemoveAllAttachedAssets_ToolTip", "Removes all the attached assets from the skeleton and mesh." ),
			FSlateIcon(), RemoveAllAttachedAssets );

		MenuBuilder.EndSection();
	}

	return MenuBuilder.MakeWidget();
}

void SSkeletonTree::FillVirtualBoneSubmenu(FMenuBuilder& MenuBuilder, TArray<TSharedPtr<FDisplayedMeshBoneInfo>> SourceBones)
{
	const bool bShowVirtualBones = false;
	TSharedRef<SWidget> MenuContent = SNew(SBoneTreeMenu, GetEditableSkeletonInternal())
		.bShowVirtualBones(false)
		.Title(LOCTEXT("TargetBonePickerTitle", "Pick Target Bone..."))
		.OnBoneSelectionChanged(this, &SSkeletonTree::OnVirtualTargetBonePicked, SourceBones);
	MenuBuilder.AddWidget(MenuContent, FText::GetEmpty(), true);
}

void SSkeletonTree::OnVirtualTargetBonePicked(FName TargetBoneName, TArray<TSharedPtr<FDisplayedMeshBoneInfo>> SourceBones)
{
	FSlateApplication::Get().DismissAllMenus();

	for (const TSharedPtr<FDisplayedMeshBoneInfo>& SourceBone : SourceBones)
	{
		if(SourceBone.IsValid())
		{
			FName SourceBoneName = SourceBone->GetRowItemName();
			if(!GetEditableSkeletonInternal()->HandleAddVirtualBone(SourceBoneName, TargetBoneName))
			{
				UE_LOG(LogAnimation, Log, TEXT("Could not create space switch bone from %s to %s, it already exists"), *SourceBoneName.ToString(), *TargetBoneName.ToString());
			}
			else
			{
				CreateFromSkeleton();
			}
		}
	}

}

void SSkeletonTree::CreateMenuForBoneReduction(FMenuBuilder& MenuBuilder, SSkeletonTree * Widget, int32 LODIndex, bool bIncludeSelected)
{
	MenuBuilder.AddMenuEntry
		(FText::FromString(FString::Printf(TEXT("From LOD %d and below"), LODIndex))
		, FText::FromString(FString::Printf(TEXT("Remove Selected %s from current LOD %d and all lower LODs"), (bIncludeSelected) ? TEXT("bones") : TEXT("children"), LODIndex))
		, FSlateIcon()
		, FUIAction(FExecuteAction::CreateSP(Widget, &SSkeletonTree::RemoveFromLOD, LODIndex, bIncludeSelected, true))
		);

	MenuBuilder.AddMenuEntry
		(FText::FromString(FString::Printf(TEXT("From LOD %d only"), LODIndex))
		, FText::FromString(FString::Printf(TEXT("Remove selected %s from current LOD %d only"), (bIncludeSelected) ? TEXT("bones") : TEXT("children"), LODIndex))
		, FSlateIcon()
		, FUIAction(FExecuteAction::CreateSP(Widget, &SSkeletonTree::RemoveFromLOD, LODIndex, bIncludeSelected, false))
		);
}


void SSkeletonTree::SetBoneTranslationRetargetingModeRecursive(EBoneTranslationRetargetingMode::Type NewRetargetingMode)
{
	TArray<FName> BoneNames;
	FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());
	for ( auto ItemIt = TreeSelection.SelectedBones.CreateConstIterator(); ItemIt; ++ItemIt )
	{
		BoneNames.Add(*static_cast<FName*>( (*ItemIt)->GetData() ));
	}

	GetEditableSkeletonInternal()->SetBoneTranslationRetargetingModeRecursive(BoneNames, NewRetargetingMode);
}

void SSkeletonTree::RemoveFromLOD(int32 LODIndex, bool bIncludeSelected, bool bIncludeBelowLODs)
{
	// we cant do this without a preview scene
	if (!GetPreviewScene().IsValid())
	{
		return;
	}

	UDebugSkelMeshComponent* PreviewMeshComponent = GetPreviewScene()->GetPreviewMeshComponent();
	if (!PreviewMeshComponent->SkeletalMesh)
	{
		return;
	}

	// ask users you can't undo this change, and warn them
	const FText Message(LOCTEXT("RemoveBonesFromLODWarning", "This action can't be undone. Would you like to continue?"));
	if (FMessageDialog::Open(EAppMsgType::YesNo, Message) == EAppReturnType::Yes)
	{
		FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());
		const FReferenceSkeleton& RefSkeleton = GetEditableSkeletonInternal()->GetSkeleton().GetReferenceSkeleton();

		TArray<FName> BonesToRemove;

		for (auto ItemIt = TreeSelection.SelectedBones.CreateConstIterator(); ItemIt; ++ItemIt)
		{
			FName BoneName = *static_cast<FName*>((*ItemIt)->GetData());
			int32 BoneIndex = RefSkeleton.FindBoneIndex(BoneName);
			if (BoneIndex != INDEX_NONE)
			{
				if (bIncludeSelected)
				{
					PreviewMeshComponent->SkeletalMesh->AddBoneToReductionSetting(LODIndex, BoneName);
					BonesToRemove.AddUnique(BoneName);
				}
				else
				{
					for (int32 ChildIndex = BoneIndex + 1; ChildIndex < RefSkeleton.GetRawBoneNum(); ++ChildIndex)
					{
						if (RefSkeleton.GetParentIndex(ChildIndex) == BoneIndex)
						{
							FName ChildBoneName = RefSkeleton.GetBoneName(ChildIndex);
							PreviewMeshComponent->SkeletalMesh->AddBoneToReductionSetting(LODIndex, ChildBoneName);
							BonesToRemove.AddUnique(ChildBoneName);
						}
					}
				}
			}
		}

		int32 TotalLOD = PreviewMeshComponent->SkeletalMesh->LODInfo.Num();
		IMeshUtilities& MeshUtilities = FModuleManager::Get().LoadModuleChecked<IMeshUtilities>("MeshUtilities");

		if (bIncludeBelowLODs)
		{
			for (int32 Index = LODIndex + 1; Index < TotalLOD; ++Index)
			{
				MeshUtilities.RemoveBonesFromMesh(PreviewMeshComponent->SkeletalMesh, Index, &BonesToRemove);
				PreviewMeshComponent->SkeletalMesh->AddBoneToReductionSetting(Index, BonesToRemove);
			}
		}

		// remove from current LOD
		MeshUtilities.RemoveBonesFromMesh(PreviewMeshComponent->SkeletalMesh, LODIndex, &BonesToRemove);
		// update UI to reflect the change
		OnLODSwitched();
	}
}

void SSkeletonTree::OnCopyBoneNames()
{
	FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());

	if( TreeSelection.SelectedBones.Num() > 0 )
	{
		FString BoneNames;
		for( auto ItemIt = TreeSelection.SelectedBones.CreateConstIterator(); ItemIt; ++ItemIt )
		{
			FName* BoneName = static_cast<FName*>( (*ItemIt)->GetData() );

			BoneNames += BoneName->ToString();
			BoneNames += "\r\n";
		}
		FPlatformMisc::ClipboardCopy( *BoneNames );
	}
}

void SSkeletonTree::OnResetBoneTransforms()
{
	if (GetPreviewScene().IsValid())
	{
		UDebugSkelMeshComponent* PreviewComponent = GetPreviewScene()->GetPreviewMeshComponent();
		check(PreviewComponent);
		UAnimPreviewInstance* PreviewInstance = PreviewComponent->PreviewInstance;
		check(PreviewInstance);

		FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());

		if (TreeSelection.SelectedBones.Num() > 0)
		{
			bool bModified = false;
			GEditor->BeginTransaction(LOCTEXT("SkeletonTree_ResetBoneTransforms", "Reset Bone Transforms"));

			for (auto ItemIt = TreeSelection.SelectedBones.CreateConstIterator(); ItemIt; ++ItemIt)
			{
				const FName* BoneName = static_cast<FName*>((*ItemIt)->GetData());
				check(BoneName);
				const FAnimNode_ModifyBone* ModifiedBone = PreviewInstance->FindModifiedBone(*BoneName);
				if (ModifiedBone != nullptr)
				{
					if (!bModified)
					{
						PreviewInstance->SetFlags(RF_Transactional);
						PreviewInstance->Modify();
						bModified = true;
					}

					PreviewInstance->RemoveBoneModification(*BoneName);
				}
			}

			GEditor->EndTransaction();
		}
	}
}

void SSkeletonTree::OnCopySockets() const
{
	FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());

	int32 NumSocketsToCopy = TreeSelection.SelectedSockets.Num();
	if ( NumSocketsToCopy > 0 )
	{
		FString SocketsDataString;

		for ( auto ItemIt = TreeSelection.SelectedSockets.CreateConstIterator(); ItemIt; ++ItemIt )
		{
			FDisplayedSocketInfo* DisplayedSocketInfo = (*ItemIt).Get();
			USkeletalMeshSocket* Socket = static_cast<USkeletalMeshSocket*>( DisplayedSocketInfo->GetData() );

			SocketsDataString += SerializeSocketToString( Socket, DisplayedSocketInfo );
		}

		FString CopyString = FString::Printf( TEXT("%s\nNumSockets=%d\n%s"), *FEditableSkeleton::SocketCopyPasteHeader, NumSocketsToCopy, *SocketsDataString );

		FPlatformMisc::ClipboardCopy( *CopyString );
	}
}

FString SSkeletonTree::SerializeSocketToString( USkeletalMeshSocket* Socket, const FDisplayedSocketInfo* DisplayedSocketInfo ) const
{
	FString SocketString;

	SocketString += FString::Printf( TEXT( "IsOnSkeleton=%s\n" ), DisplayedSocketInfo->GetParentType() == ESocketParentType::Skeleton ? TEXT( "1" ) : TEXT( "0" ) );

	FStringOutputDevice Buffer;
	const FExportObjectInnerContext Context;
	UExporter::ExportToOutputDevice( &Context, Socket, nullptr, Buffer, TEXT( "copy" ), 0, PPF_Copy, false );
	SocketString += Buffer;

	return SocketString;
}

void SSkeletonTree::OnPasteSockets(bool bPasteToSelectedBone)
{
	FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());

	// Pasting sockets should only work if there is just one bone selected
	if ( TreeSelection.IsSingleOfTypeSelected(ESkeletonTreeRowType::Bone) )
	{
		FName DestBoneName = bPasteToSelectedBone ? *static_cast<FName*>( TreeSelection.GetSingleSelectedItem()->GetData() ) : NAME_None;
		USkeletalMesh* SkeletalMesh = GetPreviewScene().IsValid() ? GetPreviewScene()->GetPreviewMeshComponent()->SkeletalMesh : nullptr;
		GetEditableSkeletonInternal()->HandlePasteSockets(DestBoneName, SkeletalMesh);

		CreateFromSkeleton();
	}
}

void SSkeletonTree::OnAddSocket()
{
	// This adds a socket to the currently selected bone in the SKELETON, not the MESH.
	FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());

	// Can only add a socket to one bone
	if (TreeSelection.IsSingleOfTypeSelected(ESkeletonTreeRowType::Bone))
	{
		FName BoneName = *static_cast<FName*>(TreeSelection.GetSingleSelectedItem()->GetData());
		USkeletalMeshSocket* NewSocket = GetEditableSkeletonInternal()->HandleAddSocket(BoneName);
		FSelectedSocketInfo SocketInfo(NewSocket, true);
		SetSelectedSocket(SocketInfo);
		CreateFromSkeleton(NewSocket);
	}
}

void SSkeletonTree::OnCustomizeSocket()
{
	// This should only be called on a skeleton socket, it copies the 
	// socket to the mesh so the user can edit it separately
	FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());

	if(TreeSelection.IsSingleOfTypeSelected(ESkeletonTreeRowType::Socket))
	{
		USkeletalMeshSocket* SocketToCustomize = static_cast<USkeletalMeshSocket*>( TreeSelection.GetSingleSelectedItem()->GetData() );
		USkeletalMesh* SkeletalMesh = GetPreviewScene().IsValid() ? GetPreviewScene()->GetPreviewMeshComponent()->SkeletalMesh : nullptr;
		GetEditableSkeletonInternal()->HandleCustomizeSocket(SocketToCustomize, SkeletalMesh);
		CreateFromSkeleton();
	}
}

void SSkeletonTree::OnPromoteSocket()
{
	// This should only be called on a mesh socket, it copies the 
	// socket to the skeleton so all meshes can use it
	FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());

	// Can only customize one socket (CreateContextMenu() should prevent this firing!)
	if(TreeSelection.IsSingleOfTypeSelected(ESkeletonTreeRowType::Socket))
	{
		USkeletalMeshSocket* SocketToPromote = static_cast<USkeletalMeshSocket*>( TreeSelection.GetSingleSelectedItem()->GetData() );
		GetEditableSkeletonInternal()->HandlePromoteSocket(SocketToPromote);
		CreateFromSkeleton();
	}
}

void SSkeletonTree::FillAttachAssetSubmenu(FMenuBuilder& MenuBuilder, const FDisplayedTreeRowInfoPtr TargetItem)
{
	FContentBrowserModule& ContentBrowserModule = FModuleManager::Get().LoadModuleChecked<FContentBrowserModule>(TEXT("ContentBrowser"));

	TArray<UClass*> FilterClasses = FComponentAssetBrokerage::GetSupportedAssets(USceneComponent::StaticClass());

	//Clean up the selection so it is relevant to Persona
	FilterClasses.RemoveSingleSwap(UBlueprint::StaticClass(), false); //Child actor components broker gives us blueprints which isn't wanted
	FilterClasses.RemoveSingleSwap(USoundBase::StaticClass(), false); //No sounds wanted

	FAssetPickerConfig AssetPickerConfig;
	AssetPickerConfig.Filter.bRecursiveClasses = true;

	for(int i = 0; i < FilterClasses.Num(); ++i)
	{
		AssetPickerConfig.Filter.ClassNames.Add(FilterClasses[i]->GetFName());
	}


	AssetPickerConfig.OnAssetSelected = FOnAssetSelected::CreateSP(this, &SSkeletonTree::OnAssetSelectedFromPicker, TargetItem);

	TSharedRef<SWidget> MenuContent = SNew(SBox)
	.WidthOverride(384)
	.HeightOverride(500)
	[
		ContentBrowserModule.Get().CreateAssetPicker(AssetPickerConfig)
	];
	MenuBuilder.AddWidget( MenuContent, FText::GetEmpty(), true);
}

void SSkeletonTree::OnAssetSelectedFromPicker(const FAssetData& AssetData, const FDisplayedTreeRowInfoPtr TargetItem)
{
	FSlateApplication::Get().DismissAllMenus();
	TArray<FAssetData> Assets;
	Assets.Add(AssetData);

	AttachAssetsToSkeletonTree(TargetItem, Assets);
}

void  SSkeletonTree::OnRemoveAllAssets()
{
	GetEditableSkeletonInternal()->HandleRemoveAllAssets(GetPreviewScene());

	CreateFromSkeleton();
}

bool SSkeletonTree::CanRemoveAllAssets() const
{
	USkeletalMesh* SkeletalMesh = GetPreviewScene().IsValid() ? GetPreviewScene()->GetPreviewMeshComponent()->SkeletalMesh : nullptr;

	const bool bHasPreviewAttachedObjects = GetEditableSkeletonInternal()->GetSkeleton().PreviewAttachedAssetContainer.Num() > 0;
	const bool bHasMeshPreviewAttachedObjects = ( SkeletalMesh && SkeletalMesh->PreviewAttachedAssetContainer.Num() );

	return bHasPreviewAttachedObjects || bHasMeshPreviewAttachedObjects;
}

bool SSkeletonTree::CanRenameSelected() const
{
	FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());
	return TreeSelection.IsSingleOfTypeSelected(ESkeletonTreeRowType::Socket);
}

void SSkeletonTree::OnRenameSocket()
{
	FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());

	if(TreeSelection.IsSingleOfTypeSelected(ESkeletonTreeRowType::Socket))
	{
		SkeletonTreeView->RequestScrollIntoView(TreeSelection.GetSingleSelectedItem());
		DeferredRenameRequest = TreeSelection.GetSingleSelectedItem();
	}
}

void SSkeletonTree::OnSelectionChanged(TSharedPtr<FDisplayedTreeRowInfo> Selection, ESelectInfo::Type SelectInfo)
{
	if( Selection.IsValid() )
	{
		//Get all the selected items
		FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());

		if (GetPreviewScene().IsValid())
		{
			UDebugSkelMeshComponent* PreviewComponent = GetPreviewScene()->GetPreviewMeshComponent();
			if (TreeSelection.SelectedItems.Num() > 0 && PreviewComponent)
			{
				// pick the first settable bone from the selection
				for (auto ItemIt = TreeSelection.SelectedItems.CreateConstIterator(); ItemIt; ++ItemIt)
				{
					FDisplayedTreeRowInfoPtr Item = *(ItemIt);

					// Test SelectInfo so we don't end up in an infinite loop due to delegates calling each other
					if (SelectInfo != ESelectInfo::Direct && (Item->GetType() == ESkeletonTreeRowType::Bone || Item->GetType() == ESkeletonTreeRowType::VirtualBone))
					{
						FName BoneName = *static_cast<FName *>(Item->GetData());

						// Get bone index
						int32 BoneIndex = PreviewComponent->GetBoneIndex(BoneName);
						if (BoneIndex != INDEX_NONE)
						{
							GetPreviewScene()->SetSelectedBone(BoneName);
							OnObjectSelectedMulticast.Broadcast(nullptr);
							break;
						}
					}
					// Test SelectInfo so we don't end up in an infinite loop due to delegates calling each other
					else if (SelectInfo != ESelectInfo::Direct && Item->GetType() == ESkeletonTreeRowType::Socket)
					{
						FDisplayedSocketInfo* DisplayedSocketInfo = static_cast<FDisplayedSocketInfo*>(Item.Get());
						USkeletalMeshSocket* Socket = static_cast<USkeletalMeshSocket*>(Item->GetData());
						FSelectedSocketInfo SocketInfo(Socket, DisplayedSocketInfo->GetParentType() == ESocketParentType::Skeleton);
						GetPreviewScene()->SetSelectedSocket(SocketInfo);

						OnObjectSelectedMulticast.Broadcast(SocketInfo.Socket);
					}
					else if (Item->GetType() == ESkeletonTreeRowType::AttachedAsset)
					{
						GetPreviewScene()->DeselectAll();

						OnObjectSelectedMulticast.Broadcast(nullptr);
					}
				}
				PreviewComponent->PostInitMeshObject(PreviewComponent->MeshObject);
			}
		}
	}
	else
	{
		if (GetPreviewScene().IsValid())
		{
			// Tell the preview scene if the user ctrl-clicked the selected bone/socket to de-select it
			GetPreviewScene()->DeselectAll();
		}

		OnObjectSelectedMulticast.Broadcast(nullptr);
	}
}

FReply SSkeletonTree::OnDropAssetToSkeletonTree(const FDisplayedTreeRowInfoPtr TargetItem, const FDragDropEvent& DragDropEvent)
{
	TSharedPtr<FAssetDragDropOp> DragDropOp = DragDropEvent.GetOperationAs<FAssetDragDropOp>();
	if (DragDropOp.IsValid())
	{
		//Do we have some assets to attach?
		if(DragDropOp->AssetData.Num() > 0)
		{
			AttachAssetsToSkeletonTree(TargetItem, DragDropOp->AssetData);
		}
		return FReply::Handled();
	}
	return FReply::Unhandled();
}

void SSkeletonTree::AttachAssetsToSkeletonTree(const FDisplayedTreeRowInfoPtr TargetItem, const TArray<FAssetData>& AssetData)
{
	bool bAllAssetWereLoaded = true;
	TArray<UObject*> DroppedObjects;
	for (int32 AssetIdx = 0; AssetIdx < AssetData.Num(); ++AssetIdx)
	{
		UObject* Object = AssetData[AssetIdx].GetAsset();
		if ( Object != NULL )
		{
			DroppedObjects.Add( Object );
		}
		else
		{
			bAllAssetWereLoaded = false;
		}
	}

	if(bAllAssetWereLoaded)
	{
		FName AttachToName = TargetItem->GetAttachName();
		bool bAttachToMesh = TargetItem->GetType() == ESkeletonTreeRowType::Socket &&
			static_cast<FDisplayedSocketInfo*>(TargetItem.Get())->GetParentType() == ESocketParentType::Mesh;
		
		GetEditableSkeletonInternal()->HandleAttachAssets(DroppedObjects, AttachToName, bAttachToMesh, GetPreviewScene());
		CreateFromSkeleton();
	}
}

void SSkeletonTree::OnItemScrolledIntoView( FDisplayedTreeRowInfoPtr InItem, const TSharedPtr<ITableRow>& InWidget)
{
	if(DeferredRenameRequest.IsValid())
	{
		DeferredRenameRequest->RequestRename();
		DeferredRenameRequest.Reset();
	}
}

void SSkeletonTree::OnTreeDoubleClick( FDisplayedTreeRowInfoPtr InItem )
{
	InItem->OnItemDoubleClicked();
}

void SSkeletonTree::SetTreeItemExpansionRecursive(TSharedPtr< FDisplayedTreeRowInfo > TreeItem, bool bInExpansionState) const
{
	SkeletonTreeView->SetItemExpansion(TreeItem, bInExpansionState);

	// Recursively go through the children.
	for (auto It = TreeItem->Children.CreateIterator(); It; ++It)
	{
		SetTreeItemExpansionRecursive(*It, bInExpansionState);
	}
}

void SSkeletonTree::PostUndo()
{
	// Rebuild the tree view whenever we undo a change to the skeleton
	CreateFromSkeleton();

	CreateTreeColumns();

	if (GetPreviewScene().IsValid())
	{
		GetPreviewScene()->DeselectAll();
	}
}

void SSkeletonTree::OnFilterTextChanged( const FText& SearchText )
{
	FilterText = SearchText;

	CreateFromSkeleton();
}

void SSkeletonTree::SetSkeletalMesh(USkeletalMesh* NewSkeletalMesh)
{
	if (GetPreviewScene().IsValid())
	{
		GetPreviewScene()->SetPreviewMesh(NewSkeletalMesh);
	}

	CreateFromSkeleton();
}

void SSkeletonTree::SetSelectedSocket( const FSelectedSocketInfo& SocketInfo )
{
	if (!bSelectingSocket)
	{
		TGuardValue<bool> RecursionGuard(bSelectingSocket, true);

		// This function is called when something else selects a socket (i.e. *NOT* the user clicking on a row in the treeview)
		// For example, this would be called if user clicked a socket hit point in the preview window

		// Firstly, find which row (if any) contains the socket requested
		for (auto SkeletonRowIt = DisplayMirror.CreateConstIterator(); SkeletonRowIt; ++SkeletonRowIt)
		{
			FDisplayedTreeRowInfoPtr SkeletonRow = *(SkeletonRowIt);

			if (SkeletonRow->GetType() == ESkeletonTreeRowType::Socket && SkeletonRow->GetData() == SocketInfo.Socket)
			{
				SkeletonTreeView->SetSelection(SkeletonRow);
				SkeletonTreeView->RequestScrollIntoView(SkeletonRow);
			}
		}

		if (GetPreviewScene().IsValid())
		{
			GetPreviewScene()->SetSelectedSocket(SocketInfo);
		}

		OnObjectSelectedMulticast.Broadcast(SocketInfo.Socket);
	}
}

void SSkeletonTree::SetSelectedBone( const FName& BoneName )
{
	if (!bSelectingBone)
	{
		TGuardValue<bool> RecursionGuard(bSelectingBone, true);
		// This function is called when something else selects a bone (i.e. *NOT* the user clicking on a row in the treeview)
		// For example, this would be called if user clicked a bone hit point in the preview window

		// Find which row (if any) contains the bone requested
		for (auto SkeletonRowIt = DisplayMirror.CreateConstIterator(); SkeletonRowIt; ++SkeletonRowIt)
		{
			FDisplayedTreeRowInfoPtr SkeletonRow = *(SkeletonRowIt);

			if (SkeletonRow->GetType() == ESkeletonTreeRowType::Bone &&
				*static_cast<FName*>(SkeletonRow->GetData()) == BoneName)
			{
				SkeletonTreeView->SetSelection(SkeletonRow);
				SkeletonTreeView->RequestScrollIntoView(SkeletonRow);
			}
		}

		if (GetPreviewScene().IsValid())
		{
			GetPreviewScene()->SetSelectedBone(BoneName);
		}

		OnObjectSelectedMulticast.Broadcast(nullptr);
	}
}

void SSkeletonTree::DeselectAll()
{
	if (!bDeselectingAll)
	{
		TGuardValue<bool> RecursionGuard(bDeselectingAll, true);
		SkeletonTreeView->ClearSelection();

		if (GetPreviewScene().IsValid())
		{
			GetPreviewScene()->DeselectAll();
		}

		OnObjectSelectedMulticast.Broadcast(nullptr);
	}
}

void SSkeletonTree::NotifyUser( FNotificationInfo& NotificationInfo )
{
	TSharedPtr<SNotificationItem> Notification = FSlateNotificationManager::Get().AddNotification( NotificationInfo );
	if ( Notification.IsValid() )
	{
		Notification->SetCompletionState( SNotificationItem::CS_Fail );
	}
}

TSharedRef< SWidget > SSkeletonTree::CreateFilterMenu()
{
	const FSkeletonTreeCommands& Actions = FSkeletonTreeCommands::Get();

	const bool CloseAfterSelection = true;
	FMenuBuilder MenuBuilder( CloseAfterSelection, UICommandList );

	MenuBuilder.BeginSection("Bones", LOCTEXT("OptionsMenuHeading", "Options"));
	{
		MenuBuilder.AddMenuEntry(Actions.ShowRetargeting);
	}
	MenuBuilder.EndSection();

	MenuBuilder.BeginSection("Bones", LOCTEXT( "BonesMenuHeading", "Bones" ) );
	{
		MenuBuilder.AddMenuEntry( Actions.ShowAllBones );
		MenuBuilder.AddMenuEntry( Actions.ShowMeshBones );
		MenuBuilder.AddMenuEntry(Actions.ShowLODBones);
		MenuBuilder.AddMenuEntry( Actions.ShowWeightedBones );
		MenuBuilder.AddMenuEntry( Actions.HideBones );
	}
	MenuBuilder.EndSection();

	MenuBuilder.BeginSection("Sockets", LOCTEXT("SocketsMenuHeading", "Sockets"));
	{
		MenuBuilder.AddMenuEntry(Actions.ShowActiveSockets);
		MenuBuilder.AddMenuEntry(Actions.ShowMeshSockets);
		MenuBuilder.AddMenuEntry(Actions.ShowSkeletonSockets);
		MenuBuilder.AddMenuEntry(Actions.ShowAllSockets);
		MenuBuilder.AddMenuEntry(Actions.HideSockets);
	}
	MenuBuilder.EndSection();

	return MenuBuilder.MakeWidget();
}

void SSkeletonTree::SetBoneFilter( EBoneFilter InBoneFilter )
{
	check( InBoneFilter < EBoneFilter::Count );
	BoneFilter = InBoneFilter;

	CreateFromSkeleton();
}

bool SSkeletonTree::IsBoneFilter( EBoneFilter InBoneFilter ) const
{
	return BoneFilter == InBoneFilter;
}

void SSkeletonTree::SetSocketFilter( ESocketFilter InSocketFilter )
{
	check( InSocketFilter < ESocketFilter::Count );
	SocketFilter = InSocketFilter;

	SetPreviewComponentSocketFilter();

	CreateFromSkeleton();
}

void SSkeletonTree::SetPreviewComponentSocketFilter() const
{
	// Set the socket filter in the debug skeletal mesh component so the viewport can share the filter settings
	if (GetPreviewScene().IsValid())
	{
		UDebugSkelMeshComponent* PreviewComponent = GetPreviewScene()->GetPreviewMeshComponent();

		bool bAllOrActive = (SocketFilter == ESocketFilter::All || SocketFilter == ESocketFilter::Active);

		if (PreviewComponent)
		{
			PreviewComponent->bMeshSocketsVisible = bAllOrActive || SocketFilter == ESocketFilter::Mesh;
			PreviewComponent->bSkeletonSocketsVisible = bAllOrActive || SocketFilter == ESocketFilter::Skeleton;
		}
	}
}

bool SSkeletonTree::IsSocketFilter( ESocketFilter InSocketFilter ) const
{
	return SocketFilter == InSocketFilter;
}

// @todo combine these two functions to one if not used by anywhere else
bool SSkeletonTree::IsBoneWeighted( int32 MeshBoneIndex, UDebugSkelMeshComponent* PreviewComponent ) const
{
	// MeshBoneIndex must be an index into the mesh's skeleton, *not* the source skeleton!!!

	if ( !PreviewComponent || !PreviewComponent->SkeletalMesh || !PreviewComponent->SkeletalMesh->GetImportedResource()->LODModels.Num() )
	{
		// If there's no mesh, then this bone can't possibly be weighted!
		return false;
	}

	//Get current LOD
	const int32 LODIndex = FMath::Clamp(PreviewComponent->PredictedLODLevel, 0, PreviewComponent->SkeletalMesh->GetImportedResource()->LODModels.Num()-1);
	FStaticLODModel& LODModel = PreviewComponent->SkeletalMesh->GetImportedResource()->LODModels[ LODIndex ];

	//Check whether the bone is vertex weighted
	int32 Index = LODModel.ActiveBoneIndices.Find( MeshBoneIndex );
	
	return Index != INDEX_NONE;
}

bool SSkeletonTree::IsBoneRequired(int32 MeshBoneIndex, UDebugSkelMeshComponent* PreviewComponent) const
{
	// MeshBoneIndex must be an index into the mesh's skeleton, *not* the source skeleton!!!

	if (!PreviewComponent || !PreviewComponent->SkeletalMesh || !PreviewComponent->SkeletalMesh->GetImportedResource()->LODModels.Num())
	{
		// If there's no mesh, then this bone can't possibly be weighted!
		return false;
	}

	//Get current LOD
	const int32 LODIndex = FMath::Clamp(PreviewComponent->PredictedLODLevel, 0, PreviewComponent->SkeletalMesh->GetImportedResource()->LODModels.Num() - 1);
	FStaticLODModel& LODModel = PreviewComponent->SkeletalMesh->GetImportedResource()->LODModels[LODIndex];

	//Check whether the bone is vertex weighted
	int32 Index = LODModel.RequiredBones.Find(MeshBoneIndex);

	return Index != INDEX_NONE;
}

FText SSkeletonTree::GetFilterMenuTitle() const
{
	FText BoneFilterMenuText;

	switch ( BoneFilter )
	{
	case EBoneFilter::All:
		BoneFilterMenuText = LOCTEXT( "BoneFilterMenuAll", "All Bones" );
		break;

	case EBoneFilter::Mesh:
		BoneFilterMenuText = LOCTEXT( "BoneFilterMenuMesh", "Mesh Bones" );
		break;

	case EBoneFilter::LOD:
		BoneFilterMenuText = LOCTEXT("BoneFilterMenuLOD", "LOD Bones");
		break;

	case EBoneFilter::Weighted:
		BoneFilterMenuText = LOCTEXT( "BoneFilterMenuWeighted", "Weighted Bones" );
		break;

	case EBoneFilter::None:
		BoneFilterMenuText = LOCTEXT( "BoneFilterMenuHidden", "Bones Hidden" );
		break;

	default:
		// Unknown mode
		check( 0 );
		break;
	}

	FText SocketFilterMenuText;

	switch (SocketFilter)
	{
	case ESocketFilter::Active:
		SocketFilterMenuText = LOCTEXT("SocketFilterMenuActive", "Active Sockets");
		break;

	case ESocketFilter::Mesh:
		SocketFilterMenuText = LOCTEXT("SocketFilterMenuMesh", "Mesh Sockets");
		break;

	case ESocketFilter::Skeleton:
		SocketFilterMenuText = LOCTEXT("SocketFilterMenuSkeleton", "Skeleton Sockets");
		break;

	case ESocketFilter::All:
		SocketFilterMenuText = LOCTEXT("SocketFilterMenuAll", "All Sockets");
		break;

	case ESocketFilter::None:
		SocketFilterMenuText = LOCTEXT("SocketFilterMenuHidden", "Sockets Hidden");
		break;

	default:
		// Unknown mode
		check(0);
		break;
	}

	return FText::Format(LOCTEXT("FilterMenuLabelFormat", "{0}, {1}"), BoneFilterMenuText, SocketFilterMenuText);
}

bool SSkeletonTree::IsAddingSocketsAllowed() const
{
	if ( SocketFilter == ESocketFilter::Skeleton ||
		SocketFilter == ESocketFilter::Active ||
		SocketFilter == ESocketFilter::All )
	{
		return true;
	}

	return false;
}

FReply SSkeletonTree::OnKeyDown( const FGeometry& MyGeometry, const FKeyEvent& InKeyEvent )
{
	if ( UICommandList->ProcessCommandBindings( InKeyEvent ) )
	{
		return FReply::Handled();
	}

	return FReply::Unhandled();
}

void SSkeletonTree::OnDeleteSelectedRows()
{
	FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());

	if(TreeSelection.HasSelectedOfType(ESkeletonTreeRowType::AttachedAsset) || TreeSelection.HasSelectedOfType(ESkeletonTreeRowType::Socket) || TreeSelection.HasSelectedOfType(ESkeletonTreeRowType::VirtualBone))
	{
		FScopedTransaction Transaction( LOCTEXT( "SkeletonTreeDeleteSelected", "Delete selected sockets/meshes/bones from skeleton tree" ) );

		DeleteAttachedAssets( TreeSelection.SelectedAssets );
		DeleteSockets( TreeSelection.SelectedSockets );
		DeleteVirtualBones( TreeSelection.SelectedVirtualBones );

		CreateFromSkeleton();
	}
}

void SSkeletonTree::DeleteAttachedAssets(const TArray<TSharedPtr<FDisplayedAttachedAssetInfo>>& InDisplayedAttachedAssetInfos)
{
	DeselectAll();

	TArray<FPreviewAttachedObjectPair> AttachedObjects;
	for(const TSharedPtr<FDisplayedAttachedAssetInfo>& AttachedAssetInfo : InDisplayedAttachedAssetInfos)
	{
		FPreviewAttachedObjectPair Pair;
		Pair.SetAttachedObject(AttachedAssetInfo->GetAsset());
		Pair.AttachedTo = AttachedAssetInfo->GetParentName();

		AttachedObjects.Add(Pair);
	}

	GetEditableSkeletonInternal()->HandleDeleteAttachedAssets(AttachedObjects, GetPreviewScene());
}

void SSkeletonTree::DeleteSockets(const TArray<TSharedPtr<FDisplayedSocketInfo>>& InDisplayedSocketInfos)
{
	DeselectAll();

	TArray<FSelectedSocketInfo> SocketInfo;

	for (const TSharedPtr<FDisplayedSocketInfo>& DisplayedSocketInfo : InDisplayedSocketInfos)
	{
		USkeletalMeshSocket* SocketToDelete = static_cast<USkeletalMeshSocket*>( DisplayedSocketInfo->GetData() );
		SocketInfo.Add(FSelectedSocketInfo(SocketToDelete, DisplayedSocketInfo->GetParentType() == ESocketParentType::Skeleton));
	}

	GetEditableSkeletonInternal()->HandleDeleteSockets(SocketInfo, GetPreviewScene());
}

void SSkeletonTree::DeleteVirtualBones(const TArray<TSharedPtr<FDisplayedVirtualBoneInfo>>& InDisplayedVirtualBonestInfos)
{
	DeselectAll();

	TArray<FName> VirtualBoneInfo;

	for (const TSharedPtr<FDisplayedVirtualBoneInfo>& DisplayedVirtualBoneInfo : InDisplayedVirtualBonestInfos)
	{
		FName* VBToDelete = static_cast<FName*>(DisplayedVirtualBoneInfo->GetData());
		VirtualBoneInfo.Add(*VBToDelete);
	}

	GetEditableSkeletonInternal()->HandleDeleteVirtualBones(VirtualBoneInfo, GetPreviewScene());
}


void SSkeletonTree::AddAttachedAssets( const FPreviewAssetAttachContainer& AttachedObjects )
{
	for(auto Iter = AttachedObjects.CreateConstIterator(); Iter; ++Iter)
	{
		const FPreviewAttachedObjectPair& Pair = (*Iter);

		if ( !FilterText.IsEmpty() && !Pair.GetAttachedObject()->GetName().Contains( FilterText.ToString() ) )
		{
			continue;
		}

		TSharedRef<FDisplayedAttachedAssetInfo> DisplayInfo = FDisplayedAttachedAssetInfo::Make(Pair.AttachedTo, Pair.GetAttachedObject(), SharedThis( this ) );
		DisplayMirror.Add(DisplayInfo);

		// for now it is a failure to not find where the asset is attached. Its possible that this might have to be changed to unloading the asset
		// if there is a valid reason why the attach parent would not exist
		if ( !AttachToParent( DisplayInfo, Pair.AttachedTo, (int32)( ESkeletonTreeRowType::Bone | ESkeletonTreeRowType::Socket ) ) )
		{
			// Just add it to the list if the parent bone isn't currently displayed
			SkeletonRowList.Add( DisplayInfo );
		}
	}
}

void SSkeletonTree::OnChangeShowingAdvancedOptions()
{
	bShowingAdvancedOptions = !bShowingAdvancedOptions;
	CreateTreeColumns();
}

bool SSkeletonTree::IsShowingAdvancedOptions() const
{
	return bShowingAdvancedOptions;
}

UBlendProfile* SSkeletonTree::GetSelectedBlendProfile()
{
	return BlendProfilePicker->GetSelectedBlendProfile();
}

FName SSkeletonTree::GetSelectedBlendProfileName() const
{
	return BlendProfilePicker->GetSelectedBlendProfileName();
}

void SSkeletonTree::OnBlendProfileSelected(UBlendProfile* NewProfile)
{
	CreateTreeColumns();
}

void SSkeletonTree::RecursiveSetBlendProfileScales(float InScaleToSet)
{
	UBlendProfile* SelectedBlendProfile = BlendProfilePicker->GetSelectedBlendProfile();
	if(SelectedBlendProfile)
	{
		TArray<FName> BoneNames;
		FBoneTreeSelection TreeSelection(SkeletonTreeView->GetSelectedItems());

		for(auto ItemIt = TreeSelection.SelectedBones.CreateConstIterator(); ItemIt; ++ItemIt)
		{
			BoneNames.Add(*static_cast<FName*>((*ItemIt)->GetData()));
		}

		GetEditableSkeletonInternal()->RecursiveSetBlendProfileScales(SelectedBlendProfile->GetFName(), BoneNames, InScaleToSet);

		CreateTreeColumns();
	}
}

void SSkeletonTree::HandleTreeRefresh()
{
	CreateFromSkeleton();
}

void SSkeletonTree::PostRenameSocket(UObject* InAttachedObject, const FName& InOldName, const FName& InNewName)
{
	TSharedPtr<IPersonaPreviewScene> LinkedPreviewScene = GetPreviewScene();
	if (LinkedPreviewScene.IsValid())
	{
		LinkedPreviewScene->RemoveAttachedObjectFromPreviewComponent(InAttachedObject, InOldName);
		LinkedPreviewScene->AttachObjectToPreviewComponent(InAttachedObject, InNewName);
	}
}

void SSkeletonTree::PostDuplicateSocket(UObject* InAttachedObject, const FName& InSocketName)
{
	TSharedPtr<IPersonaPreviewScene> LinkedPreviewScene = GetPreviewScene();
	if (LinkedPreviewScene.IsValid())
	{
		LinkedPreviewScene->AttachObjectToPreviewComponent(InAttachedObject, InSocketName);
	}

	CreateFromSkeleton();
}

void RecursiveSetLODChange(UDebugSkelMeshComponent* PreviewComponent, TSharedPtr<FDisplayedTreeRowInfo> TreeRow)
{
	if (TreeRow.Get()->GetType() == ESkeletonTreeRowType::Bone)
	{
		static_cast<FDisplayedMeshBoneInfo*>(TreeRow.Get())->CacheLODChange(PreviewComponent);
	}
	
	for (auto& Child : TreeRow->Children)
	{
		RecursiveSetLODChange(PreviewComponent, Child);
	}
}

void SSkeletonTree::OnLODSwitched()
{
	if (GetPreviewScene().IsValid())
	{
		UDebugSkelMeshComponent* PreviewComponent = GetPreviewScene()->GetPreviewMeshComponent();

		if (PreviewComponent)
		{
			LastCachedLODForPreviewMeshComponent = PreviewComponent->PredictedLODLevel;

			if (BoneFilter == EBoneFilter::Weighted || BoneFilter == EBoneFilter::LOD)
			{
				CreateFromSkeleton();
			}
			else
			{
				for (auto ItemIt : SkeletonRowList)
				{
					RecursiveSetLODChange(PreviewComponent, ItemIt);
				}
			}
		}
	}
}

void SSkeletonTree::DuplicateAndSelectSocket(const FSelectedSocketInfo& SocketInfoToDuplicate, const FName& NewParentBoneName /*= FName()*/)
{
	USkeletalMesh* SkeletalMesh = GetPreviewScene().IsValid() ? GetPreviewScene()->GetPreviewMeshComponent()->SkeletalMesh : nullptr;
	USkeletalMeshSocket* NewSocket = GetEditableSkeleton()->DuplicateSocket(SocketInfoToDuplicate, NewParentBoneName, SkeletalMesh);

	if (GetPreviewScene().IsValid())
	{
		GetPreviewScene()->SetSelectedSocket(FSelectedSocketInfo(NewSocket, SocketInfoToDuplicate.bSocketIsOnSkeleton));
	}

	CreateFromSkeleton();

	FSelectedSocketInfo NewSocketInfo(NewSocket, SocketInfoToDuplicate.bSocketIsOnSkeleton);
	SetSelectedSocket(NewSocketInfo);
}

FSlateColor SSkeletonTree::GetFilterComboButtonForegroundColor() const
{
	static const FName InvertedForegroundName("InvertedForeground");
	static const FName DefaultForegroundName("DefaultForeground");

	if (FilterComboButton.IsValid())
	{
		return FilterComboButton->IsHovered() ? FEditorStyle::GetSlateColor(InvertedForegroundName) : FEditorStyle::GetSlateColor(DefaultForegroundName);
	}
	return FSlateColor::UseForeground();
}

#undef LOCTEXT_NAMESPACE