Package com.vaadin.flow.data.selection

Class MultiSelectionEvent<C extends Component,T>

java.lang.Object

java.util.EventObject

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

com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<C,Set<T>>

com.vaadin.flow.data.selection.MultiSelectionEvent<C,T>

Type Parameters:

C - the selection component type

T - the type of the selected item

All Implemented Interfaces:

HasValue.ValueChangeEvent<Set<T>>, SelectionEvent<C,T>, Serializable

public class MultiSelectionEvent<C extends Component,T>
extends AbstractField.ComponentValueChangeEvent<C,Set<T>>
implements SelectionEvent<C,T>

Fired when the selection changes in a listing component that supports multiple item selection.

Since:

1.0.

Author:

Vaadin Ltd

See Also:

• Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor	Description
MultiSelectionEvent(C listing, HasValue<AbstractField.ComponentValueChangeEvent<C,Set<T>>,Set<T>> source, Set<T> oldSelection, boolean userOriginated)	Creates a new multi selection change event in a component.

Method Summary

Modifier and Type	Method	Description
Set<T>	getAddedSelection()	Gets the items that were added to selection.
Set<T>	getAllSelectedItems()	Gets all the currently selected items.
Optional<T>	getFirstSelectedItem()	Get first selected data item.
Set<T>	getOldSelection()	Gets the old selection.
Set<T>	getRemovedSelection()	Gets the items that were removed from selection.
Set<T>	getValue()	Gets the current selection.

Methods inherited from class com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent

getHasValue, getOldValue, toString

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

getSource, isFromClient, unregisterListener

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.vaadin.flow.component.HasValue.ValueChangeEvent

isFromClient

Methods inherited from interface com.vaadin.flow.data.selection.SelectionEvent

getSource, isFromClient

Constructor Details

MultiSelectionEvent

public MultiSelectionEvent(C listing,
 HasValue<AbstractField.ComponentValueChangeEvent<C,Set<T>>,Set<T>> source,
 Set<T> oldSelection,
 boolean userOriginated)

Creates a new multi selection change event in a component.

Parameters:

listing - the listing 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 Details

getFirstSelectedItem

public Optional<T> getFirstSelectedItem()

Description copied from interface: SelectionEvent

Get first selected data item.

This is the same as SingleSelectionEvent.getSelectedItem() in case of single selection.

Specified by:

getFirstSelectedItem in interface SelectionEvent<C extends Component,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<C extends Component,T>

Returns:

return all the selected items, if any, never null

getValue

public Set<T> getValue()

Gets the current selection.

Specified by:

getValue in interface HasValue.ValueChangeEvent<C extends Component>

Overrides:

getValue in class AbstractField.ComponentValueChangeEvent<C extends Component,Set<T>>

Returns:

an unmodifiable set of items selected after the selection was changed

getOldSelection

public Set<T> getOldSelection()

Gets the old selection.

Returns:

an unmodifiable set of items selected before the selection was changed

getRemovedSelection

public Set<T> getRemovedSelection()

Gets the items that were removed from selection.

This is just a convenience method for checking what was previously selected in getOldSelection() but not selected anymore in getValue().

Returns:

the items that were removed from selection

getAddedSelection

public Set<T> getAddedSelection()

Gets the items that were added to selection.

This is just a convenience method for checking what is new selected in getValue() and wasn't selected in getOldSelection().

Returns:

the items that were removed from selection