Client API. The Codename One framework your app is built on: this runs on the device, not in a backend.

public interface GraphListener

What a NodeGraph tells an application about. Extend GraphAdapter to implement only what is needed.

Every edit is offered first to the listeners, any of which may refuse it, and then to the model, which may refuse it too.

Methods

`public abstract void selectionChanged(NodeGraph graph)`	The selection changed.
`public abstract void nodeOpened(NodeGraph graph, GraphNode node)`	A node was double tapped.
`public abstract boolean nodeMoving(NodeGraph graph, GraphNode node, double x, double y)`	A node was dragged and is about to be moved to a world position.
`public abstract void nodeMoved(NodeGraph graph, GraphNode node)`	A node was moved by the user.
`public abstract boolean edgeCreating(NodeGraph graph, GraphNode source, GraphPort sourcePort, GraphNode target, GraphPort targetPort)`	An edge was dragged from a node or port to another and is about to be made.
`public abstract void edgeCreated(NodeGraph graph, GraphEdge edge)`	An edge was made by the user.
`public abstract boolean removing(NodeGraph graph, GraphNode node, GraphEdge edge)`	A node or an edge is about to be removed by `NodeGraph.deleteSelection`.
`public abstract void groupToggled(NodeGraph graph, GraphGroup group)`	A group was collapsed or expanded by a tap on its title.

public abstract void selectionChanged(NodeGraph graph)

The selection changed.

public abstract void nodeOpened(NodeGraph graph, GraphNode node)

A node was double tapped.

public abstract boolean nodeMoving(NodeGraph graph, GraphNode node, double x, double y)

A node was dragged and is about to be moved to a world position.

false to refuse, which puts it back

public abstract void nodeMoved(NodeGraph graph, GraphNode node)

A node was moved by the user.

public abstract boolean edgeCreating(NodeGraph graph, GraphNode source, GraphPort sourcePort, GraphNode target, GraphPort targetPort)

An edge was dragged from a node or port to another and is about to be made. Either port may be null.

false to refuse

public abstract void edgeCreated(NodeGraph graph, GraphEdge edge)

An edge was made by the user.

public abstract boolean removing(NodeGraph graph, GraphNode node, GraphEdge edge)

A node or an edge is about to be removed by NodeGraph.deleteSelection. Exactly one of the two is not null.

false to refuse

public abstract void groupToggled(NodeGraph graph, GraphGroup group)

A group was collapsed or expanded by a tap on its title.