ComboBoxDataCommunicator.SelectionPreservingKeyMapper (Vaadin Combo Box 23.6-SNAPSHOT API)

java.lang.Object
- com.vaadin.flow.data.provider.KeyMapper<TItem>
- - com.vaadin.flow.component.combobox.ComboBoxDataCommunicator.SelectionPreservingKeyMapper<TItem>

Type Parameters:

TItem - The type of the item selectable in the combo box

All Implemented Interfaces:

com.vaadin.flow.data.provider.DataKeyMapper<TItem>, Serializable

Enclosing class:

ComboBoxDataCommunicator<TItem>
```
protected static class ComboBoxDataCommunicator.SelectionPreservingKeyMapper<TItem>
extends com.vaadin.flow.data.provider.KeyMapper<TItem>
```
Customized key mapper that does not remove key for an item as long as it is selected.

See Also:

Serialized Form

- Constructor Summary
  
  Constructors
  Constructor Description
  
  SelectionPreservingKeyMapper(ComboBoxBase<?,TItem,?> comboBox)
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  String key(TItem item)
  
  void purgeItems()
  
  void remove(TItem item)
  - Methods inherited from class com.vaadin.flow.data.provider.KeyMapper
    containsKey, createKey, get, has, refresh, removeAll, setIdentifierGetter
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - SelectionPreservingKeyMapper
```
public SelectionPreservingKeyMapper(ComboBoxBase<?,TItem,?> comboBox)
```
- Method Detail
  - remove
```
public void remove(TItem item)
```
    Specified by:
    
    remove in interface com.vaadin.flow.data.provider.DataKeyMapper<TItem>
    
    Overrides:
    
    remove in class com.vaadin.flow.data.provider.KeyMapper<TItem>
  - key
```
public String key(TItem item)
```
    Specified by:
    
    key in interface com.vaadin.flow.data.provider.DataKeyMapper<TItem>
    
    Overrides:
    
    key in class com.vaadin.flow.data.provider.KeyMapper<TItem>
  - purgeItems
```
public void purgeItems()
```