com.vaadin.data

Interface SelectionModel<T>

Type Parameters:

T - the type of the items to select

All Superinterfaces:

Serializable

All Known Subinterfaces:

GridSelectionModel<T>, MultiSelectionModel<T>, SelectionModel.Multi<T>, SelectionModel.Single<T>, SingleSelectionModel<T>

All Known Implementing Classes:

AbstractSelectionModel, MultiSelectionModelImpl, NoSelectionModel, SingleSelectionModelImpl, Tree.TreeMultiSelectionModel

public interface SelectionModel<T>
extends Serializable

Models the selection logic of a Listing component. Determines how items can be selected and deselected.

Since:

8.0

Author:

Vaadin Ltd.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	SelectionModel.Multi<T> A selection model in which multiple items can be selected at the same time.
static interface	SelectionModel.Single<T> A selection model in which at most one item can be selected at a time.

Method Summary

Modifier and Type	Method and Description
Registration	addSelectionListener(SelectionListener<T> listener) Adds a generic listener to this selection model, accepting both single and multiselection events.
void	deselect(T item) Deselects the given item.
void	deselectAll() Deselects all currently selected items, if any.
Optional<T>	getFirstSelectedItem() Get first selected data item.
Set<T>	getSelectedItems() Returns an immutable set of the currently selected items.
default boolean	isSelected(T item) Returns whether the given item is currently selected.
void	select(T item) Selects the given item.

Method Detail

getSelectedItems

Set<T> getSelectedItems()

Returns an immutable set of the currently selected items. It is safe to invoke other SelectionModel methods while iterating over the set.

Implementation note: the iteration order of the items in the returned set should be well-defined and documented by the implementing class.

Returns:

the items in the current selection, not null

getFirstSelectedItem

Optional<T> getFirstSelectedItem()

Get first selected data item.

This is the same as SelectionModel.Single.getSelectedItem() in case of single selection and the first selected item from getSelectedItems() in case of multiselection.

Returns:

the first selected item.

select

void select(T item)

Selects the given item. Depending on the implementation, may cause other items to be deselected. If the item is already selected, does nothing.

Parameters:

item - the item to select, not null

deselect

void deselect(T item)

Deselects the given item. If the item is not currently selected, does nothing.

Parameters:

item - the item to deselect, not null

deselectAll

void deselectAll()

Deselects all currently selected items, if any.

isSelected

default boolean isSelected(T item)

Returns whether the given item is currently selected.

Parameters:

item - the item to check, not null

Returns:

true if the item is selected, false otherwise

addSelectionListener

Registration addSelectionListener(SelectionListener<T> listener)

Adds a generic listener to this selection model, accepting both single and multiselection events.

Parameters:

listener - the listener to add

Returns:

a registration handle for removing the listener