Please provide a ModalService that properly encapsulates the opened modal

[mak-dunkelziffer]

Prerequisites

• I have read the Contributing Guidelines.
• I have not leaked any internal/restricted information like screenshots, videos, code snippets, links etc.

Suggestion / feature request

The current implementation of the ModalService doesn't properly encapsulate the opened modal. It's more of a ModalBuilder that puts the modal into the DOM for you, but doesn't take care of the remaining life cycle.

Why is this an issue:

• MINOR: This broken encapsulation makes testing a pain, because it's not enough to mock the ModalService. You also have to mock the IxActiveModal in a compatible manner including the registering and invocation of callbacks
• MAJOR: There is no easy way to close all opened modals, e.g. in an HTTP interceptor that redirects to /500. It would be a huge improvement to be able to write inject(ModalService).close() anywhere to close any opened modals.

Potential interface for a ModalService that works as a global Singleton and assumes "no stacked modals":

@Injectable({
  providedIn: "root"
})
export class ModalService {
  private activeModal

  open(content: <ComponentWhichImplementsNecessaryInterface>, data: { ... }, ...) {
    // close/dismiss other opened modals
    // open new modal in the same manner as the current ModalService does
    // store reference in activeModal
  }

  close() {
    // close/dismiss opened modal
  }

  events() {
    // provide a common interface to listen to modal events
    // e.g. for Angular an RxJS observable, which "completes" as soon as the modal is closed
  }
}

A more sophisticated ModalService e.g. for stacked modals could be provided as required, but as overusing modals isn't the best decision for accessibility reasons anyways, not providing an API for stacked modals could also be a conscious decision to discourage such UI.

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Angular 19.0.7
Siemens IX 2.6.1