Unreal Engine 4.26 Documentation

Unreal Engine 4.27 Documentation

Unreal Engine 5.0 Documentation

Unreal Engine 5.1 Documentation

Unreal Engine 5.2 Documentation

Unreal Engine 5.3 Documentation

> Unreal Engine API Reference > Runtime > Slate > Framework > Layout > FInertialScrollManager

Light Theme

Dark Theme

FInertialScrollManager

A helper class to calculate inertial scrolling.

Choose your operating system:

Windows

macOS

Linux

References

Module	Slate
Header	/Engine/Source/Runtime/Slate/Public/Framework/Layout/InertialScrollManager.h
Include	#include "Framework/Layout/InertialScrollManager.h"

Syntax

class FInertialScrollManager

Remarks

A helper class to calculate inertial scrolling. This class combines a percentage of velocity lost per second coupled with a static amount of velocity lost per second in order to achieve a quick decay when the velocity grows small enough, and the percentage of friction lost prevents large velocities from scrolling forever.

Constructors

	Name	Description
	FInertialScrollManager ( double SampleTimeout )	Constructor

Functions

	Name	Description
void	AddScrollSample ( float Delta, double CurrentTime )	Adds a scroll velocity sample to help calculate a smooth velocity
void	ClearScrollVelocity()	Instantly end the inertial scroll
float	GetScrollVelocity()	Gets the calculated velocity of the scroll.
void	UpdateScrollVelocity ( const float InDeltaTime )	Updates the current scroll velocity. Call every frame.

Constants

Name	Description
FrictionCoefficient	This is the percentage of velocity loss per second.
StaticVelocityDrag	This is a constant amount of velocity lost per second.