6.4 The Libraries

BDC_Dialog_Library (Runtime)

Image	Info
	Static Helper Functions for Blueprint interactions.
Description
The BDC_Dialog_Library exposes the functionality of the Dialog Subsystem to Blueprints as static nodes. It provides functions to control dialog flow, manage UI rich text, manipulate global variables, and handle save data.

UI Helper Functions

Function	Parameters	Description
EnsureBDCDecorators	Target (RichTextBlock) bReparseCurrentText bShowDebug	Attempts to retrieve and assign necessary Rich Text Decorator classes to the target RichTextBlock. Useful for dynamically created widgets.

Dialog Control Functions

Function	Parameters	Description
StartDialog	SourceDialogAsset DialogID OfType ParticipantTags	Triggers the subsystem to start a specific dialog sequence. Supports Window, Bubble, and Background modes.
GetAvailableOptions	bHasAnyOptions (Out) AvailableOptions (Out)	Retrieves the current list of options if the dialog is waiting for player input.
SelectOption	SelectedIndex bValidRowFound (Out)	Selects an option by index, advancing the dialog flow.
InjectContinue	-	Signals the subsystem to proceed to the next node (simulates a "Next" click).
GetAdditionals	bHasAdditionals (Out) Objects (Out) Classes (Out) Tags (Out)	Retrieves extra data attached to the current dialog node.

Participant & Bubble Management

Function	Parameters	Description
GetAllParticipatingComponents	FilteredByTags FilteredByNames ComponentsByName (Out)	Retrieves active BDC_DialogBackend_ActorComponents from the subsystem based on filters.
ForceAllBubbleClosure	-	Closes every active dialog bubble in the world.
ForceBubbleClosureByParticipant	TargetParticipant	Closes bubbles belonging to a specific participant ID.
SetPauseDialogBubbleContaining	TargetParticipants bIsPaused	Pauses or Resumes bubbles for a specific group of participants.

Global Value Functions

Functions to send (set) or receive (get) global variables. All Send functions support bCreateIfNotExist.

Type	Send (Setter)	Receive (Getter)
Int	SendValueInt	ReceiveValueInt
Int64	SendValueInt64	ReceiveValueInt64
Float	SendValueFloat	ReceiveValueFloat
String	SendValueString	ReceiveValueString
Name	SendValueName	ReceiveValueName
Vector	SendValueVector	ReceiveValueVector
Vector2D	SendValueVector2D	ReceiveValueVector2D
Point (IntPoint)	SendValuePoint	ReceiveValuePoint
Bool	SendValueBool	ReceiveValueBool
GameplayTags	SendValueGameplayTags	ReceiveValueGameplayTags
Actor Reference	SendValueReference	ReceiveValueReference
Converter	ConvertGlobalValue (Converts Type A to Type B)

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Dialog_EditorUtilityLibrary (Editor)

Image	Info
	Helper Functions for Editor Utilities and Automation.
Description
The Dialog_EditorUtilityLibrary contains tools to speed up asset creation within the Unreal Editor. Currently, it focuses on generating Emoji tables from folder paths.

Utility Functions

Function	Parameters	Description
CreateEmojiTableOfPath	TargetDataTable PathToEmojiTextures ImageSizes bOverrideExisting bSaveDataTableAfterFinished	Synchronous function. Scans a folder path for Texture2D assets and automatically fills the target DataTable with FEmojiRow entries.
CreateEmojiTableOfPathAsync	(Same parameters as above)	Asynchronous version (Async Action). Prevents editor freezing when processing large libraries of images. Provides OnProcessing (progress) and OnFinished delegates.