FCurveChangeDiff

API > API/Editor > API/Editor/CurveEditor

Utility that holds a snapshot of some curve data for the purposes of later comparing changes made to those curves.

This is useful for actions that take multiple frames, e.g. the user dragging keys. Start by constructing FCurvesSnapshotBuilder instance, adding the curves you want to diff later, and when the operation is done call ComputeDiff to compute the change.

Note: This class introduces some overhead by temporarily saving the curve state. If the change is a one-off (i.e. not interactive) you usually know exactly what will change, so you can consider building the change directly. It's still fine to use this class in that case as it simplifies the code: the overhead is usually acceptable.


Name	FCurveChangeDiff
Type	class
Header File	/Engine/Source/Editor/CurveEditor/Public/Modification/Keys/CurveChangeDiff.h
Include Path	#include "Modification/Keys/CurveChangeDiff.h"

Syntax

class FCurveChangeDiff

Constructors

Name	Remarks	Include Path	Unreal Specifiers
FCurveChangeDiff ( FCurvesSnapshotBuilder InBuilder )		Modification/Keys/CurveChangeDiff.h
FCurveChangeDiff ( TWeakPtr< FCurveEditor > InCurveEditor, FCurvesSnapshot InSnapshot, ECurveChangeFlags InOps )		Modification/Keys/CurveChangeDiff.h

Variables

Protected

Name	Type	Remarks	Include Path
Operations	const ECurveChangeFlags	The operations that we should diff with.	Modification/Keys/CurveChangeDiff.h
Snapshot	const FCurvesSnapshot	Data that ComputeDiff diffs against.	Modification/Keys/CurveChangeDiff.h
WeakCurveEditor	const TWeakPtr< FCurveEditor >	Needed to look up curves and compare state.	Modification/Keys/CurveChangeDiff.h

Functions

Public

Name	Remarks	Include Path
FGenericCurveChangeData ComputeDiff()	Computes what has changed on the given curves.	Modification/Keys/CurveChangeDiff.h
const FCurvesSnapshot & GetSnapshot()	The snapshot against which is diffed.	Modification/Keys/CurveChangeDiff.h
void ProcessDiffs ( IMultiCurveChangeVisitor& InChangeBuilder ) const	Passes all changes to the given instance.	Modification/Keys/CurveChangeDiff.h

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