com.vaadin.ui.ItemCollapseAllowedProvider API 8.6.1 | Vaadin

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com.vaadin.ui.

Type Parameters:

T - item data type

All Superinterfaces:

Predicate<T>, Serializable, SerializablePredicate<T>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface ItemCollapseAllowedProvider<T>
extends SerializablePredicate<T>
```
A callback interface for resolving whether client-side collapsing should be allowed for an item in a listing component that displays hierarchical data, such as TreeGrid.

Since:

8.1

Author:

Vaadin Ltd

See Also:

TreeGrid.setItemCollapseAllowedProvider(ItemCollapseAllowedProvider)

- Method Summary
  
  All Methods
  Modifier and Type Method and Description
  
  boolean test(T item)
  Returns whether collapsing is allowed for the given item.
  - Methods inherited from interface com.vaadin.server.SerializablePredicate
    and, isEqual, negate, or
  - Methods inherited from interface java.util.function.Predicate
    and, isEqual, or

- Method Detail
  - test
```
boolean test(T item)
```
    Returns whether collapsing is allowed for the given item.
    
    Specified by:
    
    test in interface Predicate<T>
    
    Parameters:
    
    item - the item to test
    
    Returns:
    
    true if collapse is allowed for the given item, false otherwise