com.vaadin.event.selection

Class SingleSelectionEvent<T>

java.lang.Object

java.util.EventObject

com.vaadin.data.HasValue.ValueChangeEvent<T>

com.vaadin.event.selection.SingleSelectionEvent<T>

Type Parameters:

T - the type of the selected item

All Implemented Interfaces:

HasUserOriginated, SelectionEvent<T>, Serializable

public class SingleSelectionEvent<T>
extends HasValue.ValueChangeEvent<T>
implements SelectionEvent<T>

Fired when the selection changes in a listing component.

Since:

8.0

Author:

Vaadin Ltd.

See Also:

Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor and Description
SingleSelectionEvent(AbstractSingleSelect<T> source, T oldSelection, boolean userOriginated) Creates a new selection change event.
SingleSelectionEvent(Component component, SingleSelect<T> source, T oldSelection, boolean userOriginated) Creates a new selection change event in a component.

Method Summary

Modifier and Type	Method and Description
Set<T>	getAllSelectedItems() Gets all the currently selected items.
Optional<T>	getFirstSelectedItem() Get first selected data item.
Optional<T>	getSelectedItem() Returns an optional of the item that was selected, or an empty optional if a previously selected item was deselected.
SingleSelect<T>	getSource() The single select on which the Event initially occurred.

Methods inherited from class com.vaadin.data.HasValue.ValueChangeEvent

getComponent, getOldValue, getValue, isUserOriginated

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

Methods inherited from interface com.vaadin.event.HasUserOriginated

isUserOriginated

Constructor Detail

SingleSelectionEvent

public SingleSelectionEvent(AbstractSingleSelect<T> source,
                            T oldSelection,
                            boolean userOriginated)

Creates a new selection change event.

Parameters:

source - the listing that fired the event

oldSelection - the item that was previously selected

userOriginated - true if this event originates from the client, false otherwise.

SingleSelectionEvent

public SingleSelectionEvent(Component component,
                            SingleSelect<T> source,
                            T oldSelection,
                            boolean userOriginated)

Creates a new selection change event in a component.

Parameters:

component - the component where the event originated

source - the single select source

oldSelection - the item that was previously selected

userOriginated - true if this event originates from the client, false otherwise.

Method Detail

getSelectedItem

public Optional<T> getSelectedItem()

Returns an optional of the item that was selected, or an empty optional if a previously selected item was deselected.

The result is the current selection of the source AbstractSingleSelect object. So it's always exactly the same as optional describing AbstractSingleSelect.getValue().

Returns:

the selected item or an empty optional if deselected

See Also:

HasValue.ValueChangeEvent.getValue(), SelectionModel.Single#getSelectedItem()

getSource

public SingleSelect<T> getSource()

The single select on which the Event initially occurred.

Overrides:

getSource in class HasValue.ValueChangeEvent<T>

Returns:

The single select on which the Event initially occurred.

getFirstSelectedItem

public Optional<T> getFirstSelectedItem()

Description copied from interface: SelectionEvent

Get first selected data item.

This is the same as getSelectedItem() in case of single selection and the first selected item from MultiSelectionEvent.getNewSelection() in case of multi selection.

Specified by:

getFirstSelectedItem in interface SelectionEvent<T>

Returns:

the first selected item.

getAllSelectedItems

public Set<T> getAllSelectedItems()

Description copied from interface: SelectionEvent

Gets all the currently selected items.

This method applies more to multiselection - for single select it returns either an empty set or a set containing the only selected item.

Specified by:

getAllSelectedItems in interface SelectionEvent<T>

Returns:

return all the selected items, if any, never null