Method _syncAriaDescription

src/material/tooltip/tooltip.ts:913–939

Updates the tooltip's ARIA description based on it current state.

(oldMessage: string)

  /** Updates the tooltip's ARIA description based on it current state. */
  private _syncAriaDescription(oldMessage: string): void {
    if (this._ariaDescriptionPending) {
      return;
    }

    this._ariaDescriptionPending = true;
    this._ariaDescriber.removeDescription(this._elementRef.nativeElement, oldMessage, 'tooltip');

    // The `AriaDescriber` has some functionality that avoids adding a description if it's the
    // same as the `aria-label` of an element, however we can't know whether the tooltip trigger
    // has a data-bound `aria-label` or when it'll be set for the first time. We can avoid the
    // issue by deferring the description by a tick so Angular has time to set the `aria-label`.
    if (!this._isDestroyed) {
      afterNextRender(
        {
          write: () => {
            this._ariaDescriptionPending = false;

            if (this.message && !this.disabled) {
              this._ariaDescriber.describe(this._elementRef.nativeElement, this.message, 'tooltip');
            }
          },
        },
        {injector: this._injector},
      );
    }
  }

  /** Determines which events should be routed to the tooltip overlay. */
  private _overlayEventPredicate = (event: Event) => {