Package com.vaadin.flow.data.provider

Class ItemCountChangeEvent<T extends Component>

java.lang.Object

java.util.EventObject

com.vaadin.flow.component.ComponentEvent<T>

com.vaadin.flow.data.provider.ItemCountChangeEvent<T>

Type Parameters:

T - the event source type

All Implemented Interfaces:

Serializable

public class ItemCountChangeEvent<T extends Component>
extends ComponentEvent<T>

Event describing the item count change for a component. The ItemCountChangeEvent will fired during the "before client response"-phase, so changes done during the server round trip will only receive one event. For example, this code will trigger only one event, although there are two methods called which cause the item count change:

 
 dataView.addItemCountChangeListener(listener);
 dataView.addItem(newItem);
 dataView.setFilter(filter);
 
 

Since:

See Also:

• Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor	Description
ItemCountChangeEvent(T source, int itemCount, boolean itemCountEstimated)	Creates a new event using the given source and indicator whether the event originated from the client side or the server side.

Method Summary

Modifier and Type	Method	Description
int	getItemCount()	Get the new item count for the component.
boolean	isItemCountEstimated()	Returns whether the item count getItemCount() is an estimate or the exact count.

Methods inherited from class com.vaadin.flow.component.ComponentEvent

getSource, isFromClient, unregisterListener

Methods inherited from class java.util.EventObject

toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

ItemCountChangeEvent

public ItemCountChangeEvent(T source,
 int itemCount,
 boolean itemCountEstimated)

Creates a new event using the given source and indicator whether the event originated from the client side or the server side.

Parameters:

source - the source component

itemCount - new items count

itemCountEstimated - whether item count is an estimate

Method Details

getItemCount

public int getItemCount()

Get the new item count for the component.

Returns:

items count

isItemCountEstimated

public boolean isItemCountEstimated()

Returns whether the item count getItemCount() is an estimate or the exact count. An estimate is used when items are fetched lazily from the backend and the count callback has not been provided. See further details from LazyDataView.setItemCountEstimate(int).

NOTE: this only applies for components that do lazy loading from the backend and implement HasLazyDataView.

Returns:

true when the count is an estimate, false when the count is exact