ViewStateCache

@WorkflowUiExperimentalApi()

Handles persistence chores for container views that manage a set of Named renderings, showing a view for one at a time -- think back stacks or tab sets.

This class implements Parcelable so that it can be preserved from a container view's own View.saveHierarchyState method. A simple container can return SavedState from that method rather than creating its own persistence class.

Constructors

ViewStateCache

fun ViewStateCache()

Types

CREATOR

object CREATOR : Parcelable.Creator<ViewStateCache>

SavedState

class SavedState : View.BaseSavedState

Convenience for use in View.onSaveInstanceState and View.onRestoreInstanceState methods of container views that have no other state of their own to save.

Functions

describeContents

open override fun describeContents(): Int

prune

fun prune(retaining: Collection<Named<*>>)

To be called when the set of hidden views changes but the visible view remains the same.

restore

fun restore(from: ViewStateCache)

Replaces the state of the receiver with that of from.

update

fun update(retainedRenderings: Collection<Named<*>>, oldViewMaybe: View?, newView: View)

writeToParcel

open override fun writeToParcel(parcel: Parcel, flags: Int)