GraphListener

All Superinterfaces:

java.util.EventListener

All Known Implementing Classes:

GraphEventMulticaster, GraphLogger
```
public interface GraphListener
extends java.util.EventListener
```
A listener for changes in a graph's structure or contents, which are communicated through GraphEvent objects. GraphListeners register themselves with a GraphModel object, and receive events from Nodes and Edges contained by that model's root graph or any of its subgraphs.

Version:

$Id$

Author:

Michael Shilman, John Reekie

Pt.AcceptedRating:

Yellow

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`edgeHeadChanged(GraphEvent e)`	An edge's head has been changed in a registered graph or one of its subgraphs.
`void`	`edgeTailChanged(GraphEvent e)`	An edge's tail has been changed in a registered graph or one of its subgraphs.
`void`	`nodeAdded(GraphEvent e)`	A node has been been added to the registered graph or one of its subgraphs.
`void`	`nodeRemoved(GraphEvent e)`	A node has been been deleted from the registered graphs or one of its subgraphs.
`void`	`structureChanged(GraphEvent e)`	The structure of the event's "source" graph has been drastically changed in some way, and this event signals the listener to refresh its view of that graph from model.

- Method Detail
  - edgeHeadChanged
```
void edgeHeadChanged(GraphEvent e)
```
    An edge's head has been changed in a registered graph or one of its subgraphs. The added edge is the "source" of the event. The previous head is accessible via e.getOldValue().
  - edgeTailChanged
```
void edgeTailChanged(GraphEvent e)
```
    An edge's tail has been changed in a registered graph or one of its subgraphs. The added edge is the "source" of the event. The previous tail is accessible via e.getOldValue().
  - nodeAdded
```
void nodeAdded(GraphEvent e)
```
    A node has been been added to the registered graph or one of its subgraphs. The added node is the "source" of the event.
  - nodeRemoved
```
void nodeRemoved(GraphEvent e)
```
    A node has been been deleted from the registered graphs or one of its subgraphs. The deleted node is the "source" of the event. The previous parent graph is accessible via e.getOldValue().
  - structureChanged
```
void structureChanged(GraphEvent e)
```
    The structure of the event's "source" graph has been drastically changed in some way, and this event signals the listener to refresh its view of that graph from model.