Method _updateCurrentPositionClass

src/material/tooltip/tooltip.ts:746–776

Updates the class on the overlay panel based on the current position of the tooltip.

(connectionPair: ConnectionPositionPair)

  /** Updates the class on the overlay panel based on the current position of the tooltip. */
  private _updateCurrentPositionClass(connectionPair: ConnectionPositionPair): void {
    const {overlayY, originX, originY} = connectionPair;
    let newPosition: TooltipPosition;

    // If the overlay is in the middle along the Y axis,
    // it means that it's either before or after.
    if (overlayY === 'center') {
      // Note that since this information is used for styling, we want to
      // resolve `start` and `end` to their real values, otherwise consumers
      // would have to remember to do it themselves on each consumption.
      if (this._dir && this._dir.value === 'rtl') {
        newPosition = originX === 'end' ? 'left' : 'right';
      } else {
        newPosition = originX === 'start' ? 'left' : 'right';
      }
    } else {
      newPosition = overlayY === 'bottom' && originY === 'top' ? 'above' : 'below';
    }

    if (newPosition !== this._currentPosition) {
      const overlayRef = this._overlayRef;

      if (overlayRef) {
        const classPrefix = `${this._cssClassPrefix}-${PANEL_CLASS}-`;
        overlayRef.removePanelClass(classPrefix + this._currentPosition);
        overlayRef.addPanelClass(classPrefix + newPosition);
      }

      this._currentPosition = newPosition;
    }
  }

  /** Binds the pointer events to the tooltip trigger. */
  private _setupPointerEnterEventsIfNeeded() {