Method _createInjector

src/cdk/dialog/dialog.ts:328–360

* Creates a custom injector to be used inside the dialog. This allows a component loaded inside * of a dialog to close itself and, optionally, to return a value. * @param config Config object that is used to construct the dialog. * @param dialogRef Reference to the dialog being opened. *

(
    config: DialogConfig<D, DialogRef<R, C>>,
    dialogRef: DialogRef<R, C>,
    dialogContainer: DialogContainer,
    fallbackInjector: Injector | undefined,
  )

   * @returns The custom injector that can be used inside the dialog.
   */
  private _createInjector<R, D, C>(
    config: DialogConfig<D, DialogRef<R, C>>,
    dialogRef: DialogRef<R, C>,
    dialogContainer: DialogContainer,
    fallbackInjector: Injector | undefined,
  ): Injector {
    const userInjector = config.injector || config.viewContainerRef?.injector;
    const providers: StaticProvider[] = [
      {provide: DIALOG_DATA, useValue: config.data},
      {provide: DialogRef, useValue: dialogRef},
    ];

    if (config.providers) {
      if (typeof config.providers === 'function') {
        providers.push(...config.providers(dialogRef, config, dialogContainer));
      } else {
        providers.push(...config.providers);
      }
    }

    if (
      config.direction &&
      (!userInjector ||
        !userInjector.get<Directionality | null>(Directionality, null, {optional: true}))
    ) {
      providers.push({
        provide: Directionality,
        useValue: getDirectionality(config.direction),
      });
    }

    return Injector.create({parent: userInjector || fallbackInjector, providers});
  }

  /**
   * Removes a dialog from the array of open dialogs.