Class MatAutocompleteTrigger

src/material/autocomplete/autocomplete-trigger.ts:122–1026

  providers: [MAT_AUTOCOMPLETE_VALUE_ACCESSOR],
})
export class MatAutocompleteTrigger
  implements ControlValueAccessor, AfterViewInit, OnChanges, OnDestroy
{
  private _environmentInjector = inject(EnvironmentInjector);
  private _element = inject<ElementRef<HTMLInputElement>>(ElementRef);
  private _injector = inject(Injector);
  private _viewContainerRef = inject(ViewContainerRef);
  private _zone = inject(NgZone);
  private _changeDetectorRef = inject(ChangeDetectorRef);
  private _dir = inject(Directionality, {optional: true});
  private _formField = inject<MatFormField | null>(MAT_FORM_FIELD, {optional: true, host: true});
  private _viewportRuler = inject(ViewportRuler);
  private _scrollStrategy = inject(MAT_AUTOCOMPLETE_SCROLL_STRATEGY);
  private _renderer = inject(Renderer2);
  private _animationsDisabled = _animationsDisabled();
  private _defaults = inject<MatAutocompleteDefaultOptions | null>(
    MAT_AUTOCOMPLETE_DEFAULT_OPTIONS,
    {optional: true},
  );

  private _overlayRef: OverlayRef | null = null;
  private _portal!: TemplatePortal;
  private _componentDestroyed = false;
  private _initialized = new Subject();
  private _keydownSubscription: Subscription | undefined;
  private _outsideClickSubscription: Subscription | undefined;
  private _cleanupWindowBlur: (() => void) | undefined;

  /** Old value of the native input. Used to work around issues with the `input` event on IE. */
  private _previousValue: string | number | null = null;

  /** Value of the input element when the panel was attached (even if there are no options). */
  private _valueOnAttach: string | number | null = null;

  /** Value on the previous keydown event. */
  private _valueOnLastKeydown: string | null = null;

  /** Strategy that is used to position the panel. */
  private _positionStrategy!: FlexibleConnectedPositionStrategy;

  /** Whether or not the label state is being overridden. */
  private _manuallyFloatingLabel = false;

  /** The subscription for closing actions (some are bound to document). */
  private _closingActionsSubscription!: Subscription;

  /** Subscription to viewport size changes. */
  private _viewportSubscription = Subscription.EMPTY;

  /** Implements BreakpointObserver to be used to detect handset landscape */
  private _breakpointObserver = inject(BreakpointObserver);
  private _handsetLandscapeSubscription = Subscription.EMPTY;

  /**
   * Whether the autocomplete can open the next time it is focused. Used to prevent a focused,
   * closed autocomplete from being reopened if the user switches to another browser tab and then
   * comes back.
   */