RowHeaderPresenter

Kotlin |Java

open class RowHeaderPresenter : Presenter

kotlin.Any
↳	androidx.leanback.widget.Presenter
	↳	androidx.leanback.widget.RowHeaderPresenter

RowHeaderPresenter provides a default presentation for HeaderItem using a RowHeaderView and optionally a TextView for description. If a subclass creates its own view, the subclass must also override onCreateViewHolder(ViewGroup), onSelectLevelChanged(ViewHolder).

Summary

Nested classes
open	`ViewHolder` A ViewHolder for the RowHeaderPresenter.

Public constructors
`<init>()` Creates default RowHeaderPresenter using a title view and a description view.

Public methods
open Int	`getSpaceUnderBaseline(holder: RowHeaderPresenter.ViewHolder!)` Returns the space (distance in pixels) below the baseline of the text view, if one exists; otherwise, returns 0.
open Boolean	`isNullItemVisibilityGone()` Returns true if the view visibility is set to `View#GONE` when bound to null.
open Unit	`onBindViewHolder(viewHolder: Presenter.ViewHolder!, item: Any!)`
open Presenter.ViewHolder!	`onCreateViewHolder(parent: ViewGroup!)`
open Unit	`onUnbindViewHolder(viewHolder: Presenter.ViewHolder!)`
open Unit	`setNullItemVisibilityGone(nullItemVisibilityGone: Boolean)` Optionally sets the view visibility to `View#GONE` when bound to null.
Unit	`setSelectLevel(holder: RowHeaderPresenter.ViewHolder!, selectLevel: Float)` Sets the select level.

Protected methods
open static Float	`getFontDescent(textView: TextView!, fontMeasurePaint: Paint!)`
open Unit	`onSelectLevelChanged(holder: RowHeaderPresenter.ViewHolder!)` Called when the select level changes.

Inherited functions

From class Presenter

`Unit`	`cancelAnimationsRecursive(view: View!)` Utility method for removing all running animations on a view.
`Any!`	`getFacet(facetClass: Class<*>!)`
`Unit`	`onBindViewHolder(viewHolder: Presenter.ViewHolder!, item: Any!, payloads: MutableList<Any!>!)` Binds a `View` to an item with a list of payloads.
`Unit`	`onViewAttachedToWindow(holder: Presenter.ViewHolder!)` Called when a view created by this presenter has been attached to a window. This can be used as a reasonable signal that the view is about to be seen by the user. If the adapter previously freed any resources in `onViewDetachedFromWindow(ViewHolder)` those resources should be restored here.
`Unit`	`onViewDetachedFromWindow(holder: Presenter.ViewHolder!)` Called when a view created by this presenter has been detached from its window. Becoming detached from the window is not necessarily a permanent condition; the consumer of an presenter's views may choose to cache views offscreen while they are not visible, attaching and detaching them as appropriate. Any view property animations should be cancelled here or the view may fail to be recycled.
`Unit`	`setFacet(facetClass: Class<*>!, facetImpl: Any!)` Sets dynamic implemented facet in addition to basic Presenter functions.
`Unit`	`setOnClickListener(holder: Presenter.ViewHolder!, listener: OnClickListener!)` Called to set a click listener for the given view holder. The default implementation sets the click listener on the root view in the view holder. If the root view isn't focusable this method should be overridden to set the listener on the appropriate focusable child view(s).

Public constructors

<init>

RowHeaderPresenter()

Creates default RowHeaderPresenter using a title view and a description view.

See Also

Public methods

getSpaceUnderBaseline

open fun getSpaceUnderBaseline(holder: RowHeaderPresenter.ViewHolder!): Int

Returns the space (distance in pixels) below the baseline of the text view, if one exists; otherwise, returns 0.

isNullItemVisibilityGone

open fun isNullItemVisibilityGone(): Boolean

Returns true if the view visibility is set to View#GONE when bound to null.

onBindViewHolder

open fun onBindViewHolder(
    viewHolder: Presenter.ViewHolder!, 
    item: Any!
): Unit

onCreateViewHolder

open fun onCreateViewHolder(parent: ViewGroup!): Presenter.ViewHolder!

onUnbindViewHolder

open fun onUnbindViewHolder(viewHolder: Presenter.ViewHolder!): Unit

setNullItemVisibilityGone

open fun setNullItemVisibilityGone(nullItemVisibilityGone: Boolean): Unit

Optionally sets the view visibility to View#GONE when bound to null.

setSelectLevel

fun setSelectLevel(
    holder: RowHeaderPresenter.ViewHolder!, 
    selectLevel: Float
): Unit

Sets the select level.

Protected methods

getFontDescent

protected open static fun getFontDescent(
    textView: TextView!, 
    fontMeasurePaint: Paint!
): Float

onSelectLevelChanged

protected open fun onSelectLevelChanged(holder: RowHeaderPresenter.ViewHolder!): Unit

Called when the select level changes. The default implementation sets the alpha on the view.