added in version 1.0.0
belongs to Maven artifact androidx.recyclerview:recyclerview:1.0.0-beta01

RecyclerView.SmoothScroller.ScrollVectorProvider

public static interface RecyclerView.SmoothScroller.ScrollVectorProvider

androidx.recyclerview.widget.RecyclerView.SmoothScroller.ScrollVectorProvider


An interface which is optionally implemented by custom RecyclerView.LayoutManager to provide a hint to a RecyclerView.SmoothScroller about the location of the target position.

Summary

Public methods

abstract PointF computeScrollVectorForPosition(int targetPosition)

Should calculate the vector that points to the direction where the target position can be found.

Public methods

computeScrollVectorForPosition

added in version 1.0.0
public abstract PointF computeScrollVectorForPosition (int targetPosition)

Should calculate the vector that points to the direction where the target position can be found.

This method is used by the LinearSmoothScroller to initiate a scroll towards the target position.

The magnitude of the vector is not important. It is always normalized before being used by the LinearSmoothScroller.

LayoutManager should not check whether the position exists in the adapter or not.

Parameters
targetPosition int: the target position to which the returned vector should point

Returns
PointF the scroll vector for a given position.