com.vaadin.flow.component.grid.dataview

Class GridLazyDataView<T>

java.lang.Object

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

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

com.vaadin.flow.component.grid.dataview.GridLazyDataView<T>

Type Parameters:

T - the type of the items in grid

All Implemented Interfaces:

com.vaadin.flow.data.provider.DataView<T>, com.vaadin.flow.data.provider.LazyDataView<T>, Serializable

public class GridLazyDataView<T>
extends com.vaadin.flow.data.provider.AbstractLazyDataView<T>

Data view implementation for Grid with lazy data fetching. Provides information on the data and allows operations on it.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.vaadin.flow.data.provider.AbstractDataView

component, dataProviderSupplier, NULL_IDENTIFIER_ERROR_MESSAGE, NULL_ITEM_ERROR_MESSAGE

Constructor Summary

Constructors

Constructor and Description
GridLazyDataView(com.vaadin.flow.data.provider.DataCommunicator<T> dataCommunicator, Grid<T> component) Creates a new lazy data view for grid and verifies the passed data provider is compatible with this data view implementation.

Method Summary

Modifier and Type	Method and Description
void	setItemCountCallback(com.vaadin.flow.data.provider.CallbackDataProvider.CountCallback<T,Void> callback) Sets a callback that the Grid uses to get the exact item count in the backend.
void	setItemCountEstimate(int itemCountEstimate)
void	setItemCountFromDataProvider()
void	setItemCountUnknown()

Methods inherited from class com.vaadin.flow.data.provider.AbstractLazyDataView

getDataCommunicator, getItem, getItemCountEstimate, getItemCountEstimateIncrease, getItems, getSupportedDataProviderType, setItemCountEstimateIncrease

Methods inherited from class com.vaadin.flow.data.provider.AbstractDataView

addItemCountChangeListener, equals, getIdentifierProvider, refreshAll, refreshItem, setIdentifierProvider, verifyDataProviderType

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.vaadin.flow.data.provider.DataView

addItemCountChangeListener, refreshAll, refreshItem, setIdentifierProvider

Constructor Detail

GridLazyDataView

public GridLazyDataView(com.vaadin.flow.data.provider.DataCommunicator<T> dataCommunicator,
                        Grid<T> component)

Creates a new lazy data view for grid and verifies the passed data provider is compatible with this data view implementation.

Parameters:

dataCommunicator - the data communicator of the component

component - the grid

Method Detail

setItemCountCallback

public void setItemCountCallback(com.vaadin.flow.data.provider.CallbackDataProvider.CountCallback<T,Void> callback)

Sets a callback that the Grid uses to get the exact item count in the backend. Use this when it is cheap to get the exact item count and it is desired that the user sees the "full scrollbar size".

The given callback will be queried for the count instead of the data provider DataProvider.size(Query) method when the component has a distinct data provider set with HasLazyDataView.setItems(BackEndDataProvider).

Parameters:

callback - the callback to use for determining item count in the backend, not null

See Also:

setItemCountFromDataProvider(), setItemCountUnknown()

setItemCountFromDataProvider

public void setItemCountFromDataProvider()

Specified by:

setItemCountFromDataProvider in interface com.vaadin.flow.data.provider.LazyDataView<T>

Overrides:

setItemCountFromDataProvider in class com.vaadin.flow.data.provider.AbstractLazyDataView<T>

setItemCountEstimate

public void setItemCountEstimate(int itemCountEstimate)

Calling this method will clear any previously set count callback setItemCountCallback(CallbackDataProvider.CountCallback).

Specified by:

setItemCountEstimate in interface com.vaadin.flow.data.provider.LazyDataView<T>

Overrides:

setItemCountEstimate in class com.vaadin.flow.data.provider.AbstractLazyDataView<T>

setItemCountUnknown

public void setItemCountUnknown()

Calling this method will clear any previously set count callback setItemCountCallback(CallbackDataProvider.CountCallback).

Specified by:

setItemCountUnknown in interface com.vaadin.flow.data.provider.LazyDataView<T>

Overrides:

setItemCountUnknown in class com.vaadin.flow.data.provider.AbstractLazyDataView<T>