EdgeDecorator

The edge can be decorated in various ways. setImplementation decorates the edge's lookup to return the same instance for each edge.

graph.decorator.edgeDecorator.selectionDecorator.setImplementation(
  new ConstantSelection()
)

setImplementation with a predicate decorates the edge's lookup only to return the same instance for each edge for which the predicate returns true.

graph.decorator.edgeDecorator.selectionDecorator.setImplementation(
  (edge) => edge.tag !== null,
  new ConstantSelection()
)

setFactory calls the provided factory method to return a new instance of the queried type created for the given edge or for edges for which the predicate returns true, respectively:

graph.decorator.edgeDecorator.selectionDecorator.setFactory(
  (edge) => new CustomSelection(edge)
)
graph.decorator.edgeDecorator.selectionDecorator.setFactory(
  (edge) => edge.tag !== null,
  (edge) => new CustomSelection(edge)
)

setImplementationWrapper calls the provided factory method to return a new instance of the queried type which wraps the default implementation, once for all edges and once only for edges for which the predicate returns true.

graph.decorator.edgeDecorator.selectionDecorator.setImplementationWrapper(
  (edge, original) => new SelectionWrapper(edge, original)
)
graph.decorator.edgeDecorator.selectionDecorator.setImplementationWrapper(
  (edge) => edge.tag !== null,
  (edge, original) => new SelectionWrapper(edge, original)
)

Finally hideImplementation hides the default implementation by letting the lookup always return null for all edges and for edges for which the predicate returns true, respectively

graph.decorator.edgeDecorator.selectionDecorator.hideImplementation()
graph.decorator.edgeDecorator.selectionDecorator.hideImplementation(
  (edge) => edge.tag !== null
)

Each of these methods returns a IContextLookupChainLink which can be used to remove the modified behavior again:

constructor() {}

/**
 * @param {!IGraph} graph
 */
registerLookup(graph) {
  this.chainLink =
    graph.decorator.edgeDecorator.selectionDecorator.setFactory(
      (edge) => new CustomSelection(edge)
    )
}

/**
 * @param {!IGraph} graph
 */
deregisterLookup(graph) {
  graph.decorator.edgeDecorator.remove(this.chainLink)
}constructor() {}

registerLookup(graph: IGraph): void {
  this.chainLink =
    graph.decorator.edgeDecorator.selectionDecorator.setFactory(
      (edge) => new CustomSelection(edge)
    )!
}

deregisterLookup(graph: IGraph): void {
  graph.decorator.edgeDecorator.remove(this.chainLink)
}