Method _isMovingToSubmenu

src/cdk/menu/menu-aim.ts:201–219

Whether the user is heading towards the open submenu.

()

  /** Whether the user is heading towards the open submenu. */
  private _isMovingToSubmenu() {
    const submenuPoints = this._getSubmenuBounds();
    if (!submenuPoints) {
      return false;
    }

    let numMoving = 0;
    const currPoint = this._points[this._points.length - 1];
    // start from the second last point and calculate the slope between each point and the last
    // point.
    for (let i = this._points.length - 2; i >= 0; i--) {
      const previous = this._points[i];
      const slope = getSlope(currPoint, previous);
      if (isWithinSubmenu(submenuPoints, slope, getYIntercept(currPoint, slope))) {
        numMoving++;
      }
    }
    return numMoving >= Math.floor(NUM_POINTS / 2);
  }

  /** Get the bounding DOMRect for the open submenu. */
  private _getSubmenuBounds(): DOMRect | undefined {