LabelDecorator

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

graph.decorator.labels.editLabelHelper.addConstant(
  new ConstantEditLabelHelper(),
)

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

graph.decorator.labels.editLabelHelper.addConstant(
  (label) => label.tag !== null,
  new ConstantEditLabelHelper(),
)

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

graph.decorator.labels.editLabelHelper.addFactory(
  (label) => new CustomEditLabelHelper(label),
)
graph.decorator.labels.editLabelHelper.addFactory(
  (label) => label.tag !== null,
  (label) => new CustomEditLabelHelper(label),
)

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

graph.decorator.labels.editLabelHelper.addWrapperFactory(
  (label, original) => new EditLabelHelperWrapper(label!, original),
)
graph.decorator.labels.editLabelHelper.addWrapperFactory(
  (label) => label.tag !== null,
  (label, original) => new EditLabelHelperWrapper(label!, original),
)

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

graph.decorator.labels.editLabelHelper.hide()
graph.decorator.labels.editLabelHelper.hide((label) => label.tag !== null)

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

registerLookup(graph: IGraph): void {
  this.chainLink = graph.decorator.labels.editLabelHelper.addFactory(
    (label) => new CustomEditLabelHelper(label),
  )!
}

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