HierarchicalDataChangeHandler (vaadin-all 8.30.1 API)

All Superinterfaces:

DataChangeHandler
```
public interface HierarchicalDataChangeHandler
extends DataChangeHandler
```
FOR INTERNAL USE ONLY. This might be removed or renamed at any time without a warning. Callback interface used by DataSource to inform its user about updates to hierarchical data.

Since:

8.17

Author:

Vaadin Ltd

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void setExpandCollapsePending(boolean pending)
  FOR INTERNAL USE ONLY.
  - Methods inherited from interface com.vaadin.client.data.DataChangeHandler
    dataAdded, dataAvailable, dataRemoved, dataUpdated, resetDataAndSize

- Method Detail
  - setExpandCollapsePending
```
void setExpandCollapsePending(boolean pending)
```
    FOR INTERNAL USE ONLY. This might be removed or renamed at any time without a warning. Called when an expand or collapse event or several are about to arrive from the server, and when all expand or collapse events for this round trip have been sent from the server.
    
    Parameters:
    
    pending - true before the updates, false when all the updates are done