RecyclerView.SmoothScroller.ScrollVectorProvider

Artifact: androidx.recyclerview:recyclerview

Added in 1.0.0

Kotlin |Java

interface RecyclerView.SmoothScroller.ScrollVectorProvider

Known direct subclasses

LinearLayoutManager, StaggeredGridLayoutManager

`LinearLayoutManager`	A `RecyclerView.LayoutManager` implementation which provides similar functionality to `android.widget.ListView`.
`StaggeredGridLayoutManager`	A LayoutManager that lays out children in a staggered grid formation.

Known indirect subclasses

GridLayoutManager, WearableLinearLayoutManager

`GridLayoutManager`	A `RecyclerView.LayoutManager` implementations that lays out items in a grid.
`WearableLinearLayoutManager`	This wear-specific implementation of `LinearLayoutManager` provides basic offsetting logic for updating child layout.

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

Summary

Public functions
`PointF?`	`computeScrollVectorForPosition(targetPosition: Int)` Should calculate the vector that points to the direction where the target position can be found.

Public functions

computeScrollVectorForPosition

Added in 1.0.0

fun computeScrollVectorForPosition(targetPosition: Int): PointF?

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.