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FLevelEditorViewportClient

API > API/Editor > API/Editor/UnrealEd

   
Name FLevelEditorViewportClient
Type class
Header File /Engine/Source/Editor/UnrealEd/Public/LevelEditorViewport.h
Include Path #include "LevelEditorViewport.h"

Syntax

class FLevelEditorViewportClient : public FEditorViewportClient

Inheritance Hierarchy

Constructors

Name Remarks Include Path Unreal Specifiers

FLevelEditorViewportClient ( const TSharedPtr< class SLevelViewport >& InLevelViewport
)

 Constructor LevelEditorViewport.h  

Destructors

Name Remarks Include Path Unreal Specifiers

virtual ~FLevelEditorViewportClient()

 Destructor LevelEditorViewport.h  

Structs

Name Remarks
FActorLockStack When locked to an actor this view will be positioned in the same location and rotation as the actor.

Constants

Name Type Remarks Include Path
bIsDroppingPreviewActor bool If currently creating a preview actor. LevelEditorViewport.h
DropPreviewActors TArray< TWeakObjectPtr< AActor > > TODO: UE_DEPRECATED(5.4, TEXT("Use DropPreviewElements instead")) LevelEditorViewport.h
HoveredObjects TSet< FViewportHoverTarget > Static: List of objects we're hovering over LevelEditorViewport.h
StaticDropPreviewElements TWeakPtr< FTypedElementList > The viewport clients share a list of drop preview elements.However we still want the elements to be destroyed if all the viewports are destroyed, hence a static weak pointer and private shared pointers. LevelEditorViewport.h
ViewComponentForActorCache TMap< TObjectKey< AActor >, TWeakObjectPtr< UActorComponent > > Caching for expensive FindViewComponentForActor. Invalidated once per Tick. LevelEditorViewport.h

Variables

Public

Name Type Remarks Include Path Unreal Specifiers
bAlwaysShowModeWidgetAfterSelectionChanges bool When enabled, the Unreal transform widget will become visible after an actor is selected, even if it was turned off via a show flag LevelEditorViewport.h  
bDrawBaseInfo bool Indicates whether, of not, the base attachment volume should be drawn for this viewport. LevelEditorViewport.h  
bDuplicateActorsInProgress bool BDuplicateActorsOnNextDrag will not be set again while bDuplicateActorsInProgress is true. LevelEditorViewport.h  
bDuplicateOnNextDrag bool Used for drag duplication. LevelEditorViewport.h  
bEnableColorScaling bool   LevelEditorViewport.h  
bEnableFading bool   LevelEditorViewport.h  
bHasBegunGizmoManipulation bool True if gizmo manipulation was started from a tracking event LevelEditorViewport.h  
bIsTrackingBrushModification bool True when a brush is being transformed by its Widget LevelEditorViewport.h  
bLockedCameraView bool True if this viewport is to change its view (aspect ratio, post processing, FOV etc) to match that of the currently locked camera, if applicable LevelEditorViewport.h  
bNeedToRestoreComponentBeingMovedFlag bool True if the viewport needs to restore the flag when tracking ends LevelEditorViewport.h  
bOnlyMovedPivot bool True if only the pivot position has been moved LevelEditorViewport.h  
bReceivedFocusRecently bool Whether this viewport recently received focus. LevelEditorViewport.h  
ColorScale FVector   LevelEditorViewport.h  
FadeAmount float   LevelEditorViewport.h  
FadeColor FLinearColor   LevelEditorViewport.h  
LastEditorViewLocation FVector The viewport location that is restored when exiting PIE LevelEditorViewport.h  
LastEditorViewRotation FRotator The viewport orientation that is restored when exiting PIE LevelEditorViewport.h  
ParentLevelEditor TWeakPtr< class ILevelEditor > Parent level editor that owns this viewport. LevelEditorViewport.h  
ViewHiddenLayers TArray< FName > List of layers that are hidden in this view LevelEditorViewport.h  
VolumeActorVisibility TBitArray Special volume actor visibility settings. LevelEditorViewport.h  

Protected

Name Type Remarks Include Path Unreal Specifiers
ActorLocks FActorLockStack   LevelEditorViewport.h  
bApplyCameraSpeedScaleByDistance bool   LevelEditorViewport.h  
bCurrentlyEditingThroughMovementWidget bool Whether the user is currently using the rotation / translation widget LevelEditorViewport.h  
bEditorCameraCut bool If true, we switched between two different cameras. LevelEditorViewport.h  
bHasCachedElementsToManipulate bool The elements (from the current selection set) that this viewport can manipulate (eg, via the transform gizmo) LevelEditorViewport.h  
bWasControlledByOtherViewport bool If this view was controlled by another view this/last frame, don't update itself LevelEditorViewport.h  
bWasEditorCameraCut bool Stores the previous frame's value of bEditorCameraCut in order to reset it back to false on the next frame LevelEditorViewport.h  
CachedElementsToManipulate FTypedElementListRef   LevelEditorViewport.h  
CachedPilotTransform TOptional< FTransform > Cached transform of pilot actor before transaction, used to allow other transactions while piloting by performing a single end-transaction LevelEditorViewport.h  
DropPreviewElements TSharedPtr< FTypedElementList >   LevelEditorViewport.h  
DropPreviewMouseX int32 Represents the last known drop preview mouse position. LevelEditorViewport.h  
DropPreviewMouseY int32   LevelEditorViewport.h  
FocusTimerHandle FTimerHandle Handle to a timer event raised in ReceivedFocus LevelEditorViewport.h  
PreDragActorTransforms TMap< TWeakObjectPtr< const AActor >, FTransform > TODO: Remove this to always use PreDragElementTransforms. That requires modifications to ProjectActorsIntoWorld. LevelEditorViewport.h  
PreDragElementTransforms TMap< FTypedElementHandle, FTransform > Map of element locations keyed by their handle. LevelEditorViewport.h  
PreviousActorLocks FActorLockStack   LevelEditorViewport.h  
SpriteCategoryVisibility TBitArray Bit array representing the visibility of every sprite category in the current viewport LevelEditorViewport.h  
TrackingTransaction FTrackingTransaction Global shared transaction for all mouse interactions. LevelEditorViewport.h  
World UWorld *   LevelEditorViewport.h  

Functions

Public

Name Remarks Include Path Unreal Specifiers

void ApplyDeltaToActor ( AActor* InActor,
const FVector& InDeltaDrag,
const FRotator& InDeltaRot,
const FVector& InDeltaScale
)

   LevelEditorViewport.h  

void ApplyDeltaToActors ( const FVector& InDrag,
const FRotator& InRot,
const FVector& InScale
)

   LevelEditorViewport.h  

void ApplyDeltaToComponent ( USceneComponent* InComponent,
const FVector& InDeltaDrag,
const FRotator& InDeltaRot,
const FVector& InDeltaScale
)

   LevelEditorViewport.h  

void ApplyDeltaToElement ( const FTypedElementHandle& InElementHandle,
const FTransform& InDeltaTransform
)

   LevelEditorViewport.h  

void ApplyDeltaToSelectedElements ( const FTransform& InDeltaTransform
)

   LevelEditorViewport.h  

bool CanApplyMaterialToHitProxy ( const HHitProxy* HitProxy
) const

 Called to check if a material can be applied to an object, given the hit proxy LevelEditorViewport.h  

void CopyLayoutFromViewport ( const FLevelEditorViewportClient& InViewport
)

 Copies layout and camera settings from the specified viewport LevelEditorViewport.h  

void DrawTextureStreamingBounds ( const FSceneView* View,
FPrimitiveDrawInterface* PDI
)

 Draw the texture streaming bounds. LevelEditorViewport.h  
Access the 'active' actor lock. LevelEditorViewport.h  
Gets the actor lock. This is the actor locked to the viewport via the viewport menus. LevelEditorViewport.h  
Gets the actor lock. This is the actor locked to the viewport via the viewport menus. LevelEditorViewport.h  
Find the camera component that is driving this viewport, in the following order of preference: LevelEditorViewport.h  
Get the actor locked to the viewport by cinematic tools like Sequencer. LevelEditorViewport.h  
Get the actor locked to the viewport by cinematic tools like Sequencer. LevelEditorViewport.h  

FVector2D GetDropPreviewLocation()

   LevelEditorViewport.h  

FTypedElementListConstRef GetElementsToManipulate ( const bool bForceRefresh
)

 Get the elements (from the current selection set) that this viewport can manipulate (eg, via the transform gizmo). LevelEditorViewport.h  

bool GetFocusBounds ( FTypedElementListConstRef InElements,
FBoxSphereBounds& OutBounds
)

   LevelEditorViewport.h  

EAxisList::Type GetHorizAxis()

 Returns the horizontal axis for this viewport. LevelEditorViewport.h  

bool GetIsCameraCut()

   LevelEditorViewport.h  

const FLevelViewportActorLock & GetPreviousActorLock()

 Gets the previous actor lock. This is the actor locked to the viewport via the viewport menus. LevelEditorViewport.h  

const FLevelViewportActorLock & GetPreviousCinematicActorLock()

 Get the previous actor locked to the viewport by cinematic tools like Sequencer. LevelEditorViewport.h  

bool GetSpriteCategoryVisibility ( int32 Index
) const

 Returns whether the sprite category specified by the provided index is visible in the viewport or not LevelEditorViewport.h  

bool GetSpriteCategoryVisibility ( const FName& InSpriteCategory
) const

 Returns whether the provided unlocalized sprite category is visible in the viewport or not LevelEditorViewport.h  

EAxisList::Type GetVertAxis()

 Returns the vertical axis for this viewport. LevelEditorViewport.h  

void InitializeViewportInteraction()

 Initialize viewport interaction LevelEditorViewport.h  

void InitializeVisibilityFlags()

 Initialize visibility flags LevelEditorViewport.h  

bool IsActorLocked ( const TWeakObjectPtr< const AActor > InActor
) const

 Check to see if this actor is locked by the viewport LevelEditorViewport.h  

bool IsAnyActorLocked()

 Check to see if any actor is locked by the viewport LevelEditorViewport.h  

bool IsLockedToActor ( AActor* Actor
) const

 Check whether this viewport is locked to the specified actor LevelEditorViewport.h  

bool IsLockedToCinematic()

 Check whether this viewport is locked to display a cinematic camera, like a Sequencer camera. LevelEditorViewport.h  

bool IsVolumeVisibleInViewport ( const AActor& VolumeActor
) const

 Returns true if the passed in volume is visible in the viewport (due to volume actor visibility flags) LevelEditorViewport.h  

void MirrorSelectedActors ( const FVector& InMirrorScale
)

   LevelEditorViewport.h  

void MirrorSelectedElements ( const FVector& InMirrorScale
)

   LevelEditorViewport.h  

void MoveCameraToLockedActor()

 Moves the viewport camera according to the locked actors location and rotation LevelEditorViewport.h  

void PrepareCameraForPIE()

 Stores camera settings that may be adversely affected by PIE, so that they may be restored later LevelEditorViewport.h  

void RemoveReferenceToWorldContext ( FWorldContext& WorldContext
)

   LevelEditorViewport.h  

void ResetCamera()

 Reset the camera position and rotation. Used when creating a new level. LevelEditorViewport.h  

void ResetViewForNewMap()

 Reset the view for a new map LevelEditorViewport.h  

void RestoreCameraFromPIE()

 Restores camera settings that may be adversely affected by PIE LevelEditorViewport.h  

void SetActorLock ( const FLevelViewportActorLock& InActorLock
)

 Set the actor lock. This is the actor locked to the viewport via the viewport menus. LevelEditorViewport.h  

void SetActorLock ( AActor* Actor
)

 Set the actor lock. This is the actor locked to the viewport via the viewport menus. LevelEditorViewport.h  

void SetAllSpriteCategoryVisibility ( bool bVisible
)

 Sets the visibility of all sprite categories to the provided value LevelEditorViewport.h  

void SetCinematicActorLock ( AActor* Actor
)

 Set the actor locked to the viewport by cinematic tools like Sequencer. LevelEditorViewport.h  

void SetCinematicActorLock ( const FLevelViewportActorLock& InActorLock
)

 Set the actor locked to the viewport by cinematic tools like Sequencer. LevelEditorViewport.h  

void SetCurrentViewport()

 Set the global ptr to the current viewport LevelEditorViewport.h  
Informs the renderer that the view is being interactively edited. LevelEditorViewport.h  

void SetIsCameraCut()

 Sets a flag for this frame indicating that the camera has been cut, and temporal effects (such as motion blur) should be reset LevelEditorViewport.h  

void SetLastKeyViewport()

 Set the global ptr to the last viewport to receive a key press LevelEditorViewport.h  

void SetReferenceToWorldContext ( FWorldContext& WorldContext
)

   LevelEditorViewport.h  

void SetSpriteCategoryVisibility ( const FName& InSpriteCategory,
bool bVisible
)

 Sets the visibility of the provided unlocalized category to the provided value LevelEditorViewport.h  

void SetSpriteCategoryVisibility ( int32 Index,
bool bVisible
)

 Sets the visibility of the category specified by the provided index to the provided value LevelEditorViewport.h  

void SetViewportTypeFromTool ( ELevelViewportType InViewportType
)

 Calling SetViewportType from Dragtool_ViewportChange LevelEditorViewport.h  
Determines if the new MoveCanvas movement should be used LevelEditorViewport.h  

void UpdateAudioListener ( const FSceneView& View
)

 Updates the audio listener for this viewport LevelEditorViewport.h  

void UpdateHoveredObjects ( const TSet< FViewportHoverTarget >& NewHoveredObjects
)

   LevelEditorViewport.h  

void UpdateViewForLockedActor ( float DeltaTime
)

 Updates or resets view properties such as aspect ratio, FOV, location etc to match that of any actor we are locked to LevelEditorViewport.h  

Overridden from FEditorViewportClient

Name Remarks Include Path Unreal Specifiers

virtual void AbortTracking()

 Aborts mouse tracking (stop and cancel) LevelEditorViewport.h  

virtual void BeginCameraMovement ( bool bHasMovement
)

 Handle the camera about to be moved or stopped LevelEditorViewport.h  

virtual bool BeginTransform ( const FGizmoState& InState
)

   LevelEditorViewport.h  

virtual FSceneView * CalcSceneView ( FSceneViewFamily* ViewFamily,
const int32 StereoViewIndex
)

 Configures the specified FSceneView object with the view and projection matrices for this viewport. LevelEditorViewport.h  

virtual FDropQuery CanDropObjectsAtCoordinates ( int32 MouseX,
int32 MouseY,
const FAssetData& AssetInfo
)

 Checks the viewport to see if the given object can be dropped using the given mouse coordinates local to this viewport LevelEditorViewport.h  

virtual void CheckHoveredHitProxy ( HHitProxy* HoveredHitProxy
)

 Checks if the mouse is hovered over a hit proxy and decides what to do. LevelEditorViewport.h  

virtual void DestroyDropPreviewActors()

 If dragging an actor for placement, this function destroys the actor. LevelEditorViewport.h  

virtual void DestroyDropPreviewElements()

 If dragging items for placement, this function destroys the items. LevelEditorViewport.h  

virtual void DrawCanvas ( FViewport& InViewport,
FSceneView& View,
FCanvas& Canvas
)

 Called to draw onto the viewports 2D canvas LevelEditorViewport.h  

virtual bool DropObjectsAtCoordinates ( int32 MouseX,
int32 MouseY,
const TArray< UObject* >& DroppedObjects,
TArray< AActor* >& OutNewActors,
bool bOnlyDropOnTarget,
bool bCreateDropPreview,
bool bSelectActors,
UActorFactory* FactoryToUse
)

   LevelEditorViewport.h  

virtual bool DropObjectsAtCoordinates ( int32 MouseX,
int32 MouseY,
const TArray< UObject* >& DroppedObjects,
TArray< FTypedElementHandle >& OutNewItems,
const FDropObjectOptions& Options
)

 Attempts to intelligently drop the given objects in the viewport, using the given mouse coordinates local to this viewport LevelEditorViewport.h  

virtual void EndCameraMovement()

   LevelEditorViewport.h  

virtual bool EndTransform ( const FGizmoState& InState
)

   LevelEditorViewport.h  

virtual FLinearColor GetBackgroundColor()

   LevelEditorViewport.h  

virtual const FEditorViewportCameraSpeedSettings & GetCameraSpeedSettings()

 Gets the settings that control camera speed for this viewport LevelEditorViewport.h  

virtual bool GetPivotForOrbit ( FVector& OutPivot
) const

 Get the custom pivot point around which the camera should orbit for this viewport LevelEditorViewport.h  

virtual ELevelViewportType GetViewportType()

 Returns the effective viewport type (taking into account any actor locking or camera possession) LevelEditorViewport.h  

virtual FMatrix GetWidgetCoordSystem()

   LevelEditorViewport.h  

virtual FVector GetWidgetLocation()

   LevelEditorViewport.h  

virtual UE::Widget::EWidgetMode GetWidgetMode()

   LevelEditorViewport.h  

virtual bool HasDropPreviewActors()

 Returns true if a placement dragging actor exists LevelEditorViewport.h  

virtual bool HasDropPreviewElements()

 Returns true if a placement drag preview elements exists LevelEditorViewport.h  

virtual bool InputWidgetDelta ( FViewport* InViewport,
EAxisList::Type CurrentAxis,
FVector& Drag,
FRotator& Rot,
FVector& Scale
)

 Called to give the viewport client a chance to handle widgets being moved LevelEditorViewport.h  

virtual bool IsLevelEditorClient()

 If true, this is a level editor viewport LevelEditorViewport.h  

virtual TSharedPtr< FDragTool > MakeDragTool ( EDragTool::Type DragToolType
)

 Called to make a drag tool when the user starts dragging in the viewport LevelEditorViewport.h  

virtual void NudgeSelectedObjects ( const FInputEventState& InputState
)

   LevelEditorViewport.h  

virtual void OverridePostProcessSettings ( FSceneView& View
)

 Called to override any post process settings for the view LevelEditorViewport.h  

virtual void ProcessClick ( FSceneView& View,
HHitProxy* HitProxy,
FKey Key,
EInputEvent Event,
uint32 HitX,
uint32 HitY
)

 Called when the user clicks in the viewport LevelEditorViewport.h  

virtual void RotateViewportType()

 Rotate through viewport view options LevelEditorViewport.h  

virtual void SetCameraSpeedSettings ( const FEditorViewportCameraSpeedSettings& InCameraSpeedSettings
)

 Sets the camera speed settings for this viewport LevelEditorViewport.h  

virtual void SetupViewForRendering ( FSceneViewFamily& ViewFamily,
FSceneView& View
)

 Called to do any additional set up of the view for rendering LevelEditorViewport.h  

virtual void SetViewportType ( ELevelViewportType InViewportType
)

 Set the viewport type of the client LevelEditorViewport.h  

virtual void SetVREditView ( bool bGameViewEnable
)

   LevelEditorViewport.h  

virtual bool ShouldLockPitch()

   LevelEditorViewport.h  

virtual bool ShouldScaleCameraSpeedByDistance()

   LevelEditorViewport.h  

virtual void SummonContextMenu ( const FTypedElementHandle& HitProxyElement
)

 Override to specify what should happen when a context menu is requested LevelEditorViewport.h  

virtual void Tick ( float DeltaSeconds
)

 Ticks this viewport client LevelEditorViewport.h  

virtual void TrackingStarted ( const FInputEventState& InInputState,
bool bIsDraggingWidget,
bool bNudge
)

 Called when mouse movement tracking begins LevelEditorViewport.h  

virtual void TrackingStopped()

 Called when mouse movement tracking stops LevelEditorViewport.h  

virtual bool UpdateDropPreviewActors ( int32 MouseX,
int32 MouseY,
const TArray< UObject* >& DroppedObjects,
bool& out_bDroppedObjectsVisible,
UActorFactory* FactoryToUse
)

 If dragging an actor for placement, this function updates its position. LevelEditorViewport.h  

virtual bool UpdateDropPreviewElements ( int32 MouseX,
int32 MouseY,
const TArray< UObject* >& DroppedObjects,
bool& out_bDroppedObjectsVisible,
TScriptInterface< IAssetFactoryInterface > Factory
)

 If dragging items for placement, this function updates their position. LevelEditorViewport.h  

virtual void UpdateLinkedOrthoViewports ( bool bInvalidate
)

 FEditorViewportClient Interface LevelEditorViewport.h  

virtual bool UseAppTime()

 Should this viewport use app time instead of world time. LevelEditorViewport.h  

Overridden from FViewportClient

Name Remarks Include Path Unreal Specifiers

virtual void CapturedMouseMove ( FViewport* InViewport,
int32 InMouseX,
int32 InMouseY
)

 Called when the mouse is moved while a window input capture is in effect LevelEditorViewport.h  

virtual void ConditionalRestoreWorld ( UWorld* InWorld
)

 Restores GWorld to InWorld LevelEditorViewport.h  

virtual UWorld * ConditionalSetWorld()

 Sets GWorld to the appropriate world for this client LevelEditorViewport.h  

virtual EMouseCursor::Type GetCursor ( FViewport* Viewport,
int32 X,
int32 Y
)

   LevelEditorViewport.h  

virtual UWorld * GetWorld ()

 Use the viewports Scene to get a world. LevelEditorViewport.h  

virtual bool InputAxis ( const FInputKeyEventArgs& Args
)

   LevelEditorViewport.h  

virtual bool InputKey ( const FInputKeyEventArgs& InEventArgs
)

   LevelEditorViewport.h  

virtual void LostFocus ( FViewport* InViewport
)

   LevelEditorViewport.h  

virtual void MouseMove ( FViewport* InViewport,
int32 x,
int32 y
)

   LevelEditorViewport.h  

virtual bool OverrideHighResScreenshotCaptureRegion ( FIntRect& OutCaptureRegion
)

   LevelEditorViewport.h  

virtual void ReceivedFocus ( FViewport* InViewport
)

   LevelEditorViewport.h  

virtual void SetIsSimulateInEditorViewport ( bool bInIsSimulateInEditorViewport
)

   LevelEditorViewport.h  

Overridden from FViewElementDrawer

Name Remarks Include Path Unreal Specifiers

virtual void Draw ( const FSceneView* View,
FPrimitiveDrawInterface* PDI
)

 FViewElementDrawer interface LevelEditorViewport.h  

Overridden from FGCObject

Name Remarks Include Path Unreal Specifiers

virtual void AddReferencedObjects ( FReferenceCollector& Collector
)

 GC references.Serialization. LevelEditorViewport.h  

Protected

Name Remarks Include Path Unreal Specifiers

bool CanDropBlueprintAsset ( const FSelectedAssetInfo&
)

 Checks the viewport to see if the given blueprint asset can be dropped on the viewport. LevelEditorViewport.h  

void HandleViewportSettingChanged ( FName PropertyName
)

 Callback for when an editor user setting has changed LevelEditorViewport.h  

void OnActorMoved ( AActor* InActor
)

 Delegate handler for ActorMoved events LevelEditorViewport.h  

void OnEditorCleanse()

 Called when editor cleanse event is triggered LevelEditorViewport.h  

void OnMapChanged ( UWorld* InWorld,
EMapChangeType MapChangeType
)

 Callback for when a map is created or destroyed LevelEditorViewport.h  

void OnPreBeginPIE ( const bool bIsSimulating
)

 Called before the editor tries to begin PIE LevelEditorViewport.h  

void OnWidgetModeChanged ( UE::Widget::EWidgetMode NewMode
)

 Called when the widget mode changes. LevelEditorViewport.h  

Overridden from FEditorViewportClient

Name Remarks Include Path Unreal Specifiers

virtual bool GetActiveSafeFrame ( float& OutAspectRatio
) const

 Helper used by DrawSafeFrames to get the current safe frame aspect ratio. LevelEditorViewport.h  

virtual void PerspectiveCameraMoved()

 Called when the perspective viewport camera moves LevelEditorViewport.h  

virtual void RedrawAllViewportsIntoThisScene()

 Invalidates this and other linked viewports (anything viewing the same scene) LevelEditorViewport.h  

Static

Name Remarks Include Path Unreal Specifiers

static void AddHoverEffect ( const FViewportHoverTarget& InHoverTarget
)

 Static: Adds a hover effect to the specified object LevelEditorViewport.h  

static void ClearHoverFromObjects()

 Static: Clears viewport hover effects from any objects that currently have that LevelEditorViewport.h  
Find a view component to use for the specified actor. LevelEditorViewport.h  

static UActorComponent * FindViewComponentForActor ( AActor const* Actor,
TSet< AActor const* >& CheckedActors
)

 Internal function for public FindViewComponentForActor, which finds a view component to use for the specified actor. LevelEditorViewport.h  

static const TArray< TWeakObjectPtr< AActor > > & GetDropPreviewActors()

   LevelEditorViewport.h  

static UObject * GetOrCreateMaterialFromTexture ( UTexture* UnrealTexture
)

 Static: Given a texture, returns a material for that texture, creating a new asset if necessary. LevelEditorViewport.h  

static bool IsDroppingPreviewActor()

 Returns true if creating a preview actor in the viewport. LevelEditorViewport.h  

static void RemoveHoverEffect ( const FViewportHoverTarget& InHoverTarget
)

 Static: Removes a hover effect to the specified object LevelEditorViewport.h  

static void SetIsDroppingPreviewActor ( bool bNewIsDroppingPreviewActor
)

 Sets the state of creating a preview actor in the viewport. LevelEditorViewport.h  

static TArray< AActor * > TryPlacingActorFromObject ( ULevel* InLevel,
UObject* ObjToUse,
bool bSelectActors,
EObjectFlags ObjectFlags,
UActorFactory* FactoryToUse,
const FName Name,
const FViewportCursorLocation* Cursor
)

 Static: Attempts to place the specified object in the level, returning one or more newly-created actors if successful. LevelEditorViewport.h  

static TArray< FTypedElementHandle > TryPlacingAssetObject ( ULevel* InLevel,
UObject* AssetObject,
const UE::AssetPlacementUtil::FExtraPlaceAssetOptions& AdditionalParams,
const FViewportCursorLocation* CursorInformation
)

 Static: Attempts to place the specified asset object in the level, returning one or more newly-created objects by their FTypedElementHandles if successful. LevelEditorViewport.h  

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