Package com.smartgwt.client.widgets.tree.events

# Interface HasDataChangedHandlers

All Superinterfaces:
  `HasHandlers`

All Known Implementing Classes:
  `EditTree`, `TreeGrid`, `TreePalette`

public interface HasDataChangedHandlers extends HasHandlers

- ## Method Summary

  Modifier and Type
  Method
  Description
  `HandlerRegistration`
  `addDataChangedHandler(DataChangedHandler handler)`
  Notification method fired when the TreeGrid's data changes, for any reason.

  ### Methods inherited from interface com.google.gwt.event.shared.HasHandlers

  `fireEvent`

- ## Method Details

  - ### addDataChangedHandler

    HandlerRegistration addDataChangedHandler(DataChangedHandler handler)
    Notification method fired when the TreeGrid's data changes, for any reason.

    Examples of why data changed might be:

    - a call to `addData()`, `updateData()`, or `removeData()`
    - `DataSource` updates from the server for `ResultTree` data (triggered by record editing, etc.)
    - fetches arriving back from the server for `ResultTree` data
    - programmatic changes to `Tree` data if made through APIs such as `Tree.add()`, `Tree.remove()`, etc.
    - cache invalidation
    - filtering
    Calling `setData()` doesn't call this notification directly, but it may fire if one of the above listed events is triggered (e.g. a server fetch for `ResultTree` data).

    Note that the `operationType` parameter is optional and will be passed and contain the operation (e.g. "update") if this notification was triggered by a fetch, an `addData()`, `updateData()`, or `removeData()`, or a `DataSource` update for `ResultTree` data (the first three reasons listed above) but otherwise will be null.

    Parameters:
      `handler` - the dataChanged handler
    Returns:
      `HandlerRegistration` used to remove this handler