OnChildViewHolderSelectedListener

Artifact: androidx.leanback:leanback-grid

Kotlin |Java

abstract class OnChildViewHolderSelectedListener

Interface for receiving notification when a child of this ViewGroup has been selected. There are two methods:

{link onChildViewHolderSelected} is called when the view holder is about to be selected. The listener could change size of the view holder in this callback.
{link onChildViewHolderSelectedAndPositioned is called when view holder has been selected and laid out in RecyclerView.

Summary

Public constructors
`OnChildViewHolderSelectedListener()`

Public functions
`Unit`	`onChildViewHolderSelected( parent: RecyclerView, child: RecyclerView.ViewHolder?, position: Int, subposition: Int )` Callback method to be invoked when a child of this ViewGroup has been selected.
`Unit`	`onChildViewHolderSelectedAndPositioned( parent: RecyclerView, child: RecyclerView.ViewHolder?, position: Int, subposition: Int )` Callback method to be invoked when a child of this ViewGroup has been selected and positioned.

Public constructors

OnChildViewHolderSelectedListener

Added in 1.0.0-alpha03

OnChildViewHolderSelectedListener()

Public functions

Added in 1.0.0-alpha03

fun onChildViewHolderSelected(
    parent: RecyclerView,
    child: RecyclerView.ViewHolder?,
    position: Int,
    subposition: Int
): Unit

Callback method to be invoked when a child of this ViewGroup has been selected. Listener might change the size of the child and the position of the child is not finalized. To get the final layout position of child, override onChildViewHolderSelectedAndPositioned.

Parameters
`parent: RecyclerView`	The RecyclerView where the selection happened.
`child: RecyclerView.ViewHolder?`	The ViewHolder within the RecyclerView that is selected, or null if no view is selected.
`position: Int`	The position of the view in the adapter, or NO_POSITION if no view is selected.
`subposition: Int`	The index of which `ItemAlignmentDef` being used, 0 if there is no ItemAlignmentDef defined for the item.

Added in 1.0.0-alpha03

fun onChildViewHolderSelectedAndPositioned(
    parent: RecyclerView,
    child: RecyclerView.ViewHolder?,
    position: Int,
    subposition: Int
): Unit

Callback method to be invoked when a child of this ViewGroup has been selected and positioned.

Parameters
`parent: RecyclerView`	The RecyclerView where the selection happened.
`child: RecyclerView.ViewHolder?`	The ViewHolder within the RecyclerView that is selected, or null if no view is selected.
`position: Int`	The position of the view in the adapter, or NO_POSITION if no view is selected.
`subposition: Int`	The index of which `ItemAlignmentDef` being used, 0 if there is no ItemAlignmentDef defined for the item.