Collapsible (vaadin-all 7.7.46 API)

All Superinterfaces:

Container, Container.Hierarchical, Container.Ordered, Serializable
```
public interface Collapsible
extends Container.Hierarchical, Container.Ordered
```
Container needed by large lazy loading hierarchies displayed e.g. in TreeTable.
Container of this type gets notified when a subtree is opened/closed in a component displaying its content. This allows container to lazy load subtrees and release memory when a sub-tree is no longer displayed.
Methods from Container.Ordered (and from if implemented) are expected to work as in "preorder" of the currently visible hierarchy. This means for example that the return value of size method changes when subtree is collapsed/expanded. In other words items in collapsed sub trees should be "ignored" by container when the container is accessed with methods introduced in Container.Ordered or . From the accessors point of view, items in collapsed subtrees don't exist.

Nested Class Summary
- Nested classes/interfaces inherited from interface com.vaadin.data.Container
  Container.Editor, Container.Filter, Container.Filterable, Container.Hierarchical, Container.Indexed, Container.ItemSetChangeEvent, Container.ItemSetChangeListener, Container.ItemSetChangeNotifier, Container.Ordered, Container.PropertySetChangeEvent, Container.PropertySetChangeListener, Container.PropertySetChangeNotifier, Container.SimpleFilterable, Container.Sortable, Container.Viewer

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`isCollapsed(Object itemId)`	Checks whether the `Item`, identified by `itemId` is collapsed or not.
`void`	`setCollapsed(Object itemId, boolean collapsed)`	Collapsing the `Item` indicated by `itemId` hides all children, and their respective children, from the `Container`.

Methods inherited from interface com.vaadin.data.Container
addContainerProperty, addItem, addItem, containsId, getContainerProperty, getContainerPropertyIds, getItem, getItemIds, getType, removeAllItems, removeContainerProperty, size

Methods inherited from interface com.vaadin.data.Container.Hierarchical
areChildrenAllowed, getChildren, getParent, hasChildren, isRoot, removeItem, rootItemIds, setChildrenAllowed, setParent

Methods inherited from interface com.vaadin.data.Container.Ordered
addItemAfter, addItemAfter, firstItemId, isFirstId, isLastId, lastItemId, nextItemId, prevItemId

- Method Detail
  - setCollapsed
```
void setCollapsed(Object itemId,
                  boolean collapsed)
```
    Collapsing the Item indicated by itemId hides all children, and their respective children, from the Container.
    
    If called on a leaf Item, this method does nothing.
    
    Parameters:
    
    itemId - the identifier of the collapsed Item
    
    collapsed - true if you want to collapse the children below this Item. false if you want to uncollapse the children.
  - isCollapsed
```
boolean isCollapsed(Object itemId)
```
    Checks whether the Item, identified by itemId is collapsed or not.
    
    If an Item is "collapsed" its children are not included in methods used to list Items in this container.
    
    Parameters:
    
    itemId - The Item's identifier that is to be checked.
    
    Returns:
    
    true iff the Item identified by itemId is currently collapsed, otherwise false.