Function ngOnChanges

src/material/datepicker/datepicker-base.ts:560–576

(changes: SimpleChanges<this>)

  }

  ngOnChanges(changes: SimpleChanges<this>) {
    const positionChange = changes['xPosition'] || changes['yPosition'];

    if (positionChange && !positionChange.firstChange && this._overlayRef) {
      const positionStrategy = this._overlayRef.getConfig().positionStrategy;

      if (positionStrategy instanceof FlexibleConnectedPositionStrategy) {
        this._setConnectedPositions(positionStrategy);

        if (this.opened) {
          this._overlayRef.updatePosition();
        }
      }
    }

    this.stateChanges.next(undefined);
  }

  ngOnDestroy() {
    this._destroyOverlay();