Method updateStickyFooterRowStyles

src/cdk/table/table.ts:857–877

* Updates the footer sticky styles. First resets all applied styles with respect to the cells * sticking to the bottom. Then, evaluating which cells need to be stuck to the bottom. This is * automatically called when the footer row changes its displayed set of columns, or if its * sticky in

()

   * of these events.
   */
  updateStickyFooterRowStyles(): void {
    const footerRows = this._getRenderedRows(this._footerRowOutlet);

    // Hide the tfoot element if there are no footer rows. This is necessary to satisfy
    // overzealous a11y checkers that fail because the `rowgroup` element does not contain
    // required child `row`.
    if (this._isNativeHtmlTable) {
      const tfoot = closestTableSection(this._footerRowOutlet, 'tfoot');
      if (tfoot) {
        tfoot.style.display = footerRows.length ? '' : 'none';
      }
    }

    const stickyStates = this._footerRowDefs.map(def => def.sticky);
    this._stickyStyler.clearStickyPositioning(footerRows, ['bottom']);
    this._stickyStyler.stickRows(footerRows, stickyStates, 'bottom');
    this._stickyStyler.updateStickyFooterContainer(this._elementRef.nativeElement, stickyStates);

    // Reset the dirty state of the sticky input change since it has been used.
    this._footerRowDefs.forEach(def => def.resetStickyChanged());
  }

  /**
   * Updates the column sticky styles. First resets all applied styles with respect to the cells