ObjectAdapter.DataObserver

Added in 1.1.0

Kotlin |Java

abstract class ObjectAdapter.DataObserver

A DataObserver can be notified when an ObjectAdapter's underlying data changes. Separate methods provide notifications about different types of changes.

Summary

Public constructors
`DataObserver()`

Public functions
`Unit`	`onChanged()` Called whenever the ObjectAdapter's data has changed in some manner outside of the set of changes covered by the other range-based change notification methods.
`Unit`	`onItemMoved(fromPosition: Int, toPosition: Int)` Called when an item is moved from one position to another position
`Unit`	`onItemRangeChanged(positionStart: Int, itemCount: Int)` Called when a range of items in the ObjectAdapter has changed.
`Unit`	`onItemRangeChanged(positionStart: Int, itemCount: Int, payload: Any?)` Called when a range of items in the ObjectAdapter has changed.
`Unit`	`onItemRangeInserted(positionStart: Int, itemCount: Int)` Called when a range of items is inserted into the ObjectAdapter.
`Unit`	`onItemRangeRemoved(positionStart: Int, itemCount: Int)` Called when a range of items is removed from the ObjectAdapter.

Public constructors

DataObserver

Added in 1.1.0

DataObserver()

Public functions

onChanged

Added in 1.1.0

fun onChanged(): Unit

Called whenever the ObjectAdapter's data has changed in some manner outside of the set of changes covered by the other range-based change notification methods.

onItemMoved

Added in 1.1.0

fun onItemMoved(fromPosition: Int, toPosition: Int): Unit

Called when an item is moved from one position to another position

Parameters
`fromPosition: Int`	Previous position of the item.
`toPosition: Int`	New position of the item.

onItemRangeChanged

Added in 1.1.0

fun onItemRangeChanged(positionStart: Int, itemCount: Int): Unit

Called when a range of items in the ObjectAdapter has changed. The basic ordering and structure of the ObjectAdapter has not changed.

Parameters
`positionStart: Int`	The position of the first item that changed.
`itemCount: Int`	The number of items changed.

onItemRangeChanged

Added in 1.1.0

fun onItemRangeChanged(positionStart: Int, itemCount: Int, payload: Any?): Unit

Called when a range of items in the ObjectAdapter has changed. The basic ordering and structure of the ObjectAdapter has not changed.

Parameters
`positionStart: Int`	The position of the first item that changed.
`itemCount: Int`	The number of items changed.
`payload: Any?`	Optional parameter, use null to identify a "full" update.

onItemRangeInserted

Added in 1.1.0

fun onItemRangeInserted(positionStart: Int, itemCount: Int): Unit

Called when a range of items is inserted into the ObjectAdapter.

Parameters
`positionStart: Int`	The position of the first inserted item.
`itemCount: Int`	The number of items inserted.

onItemRangeRemoved

Added in 1.1.0

fun onItemRangeRemoved(positionStart: Int, itemCount: Int): Unit

Called when a range of items is removed from the ObjectAdapter.

Parameters
`positionStart: Int`	The position of the first removed item.
`itemCount: Int`	The number of items removed.