Method _checkStickyStates

src/cdk/table/table.ts:1442–1466

* Checks if there has been a change in sticky states since last check and applies the correct * sticky styles. Since checking resets the "dirty" state, this should only be performed once * during a change detection and after the inputs are settled (after content check).

()

   * during a change detection and after the inputs are settled (after content check).
   */
  private _checkStickyStates() {
    const stickyCheckReducer = (
      acc: boolean,
      d: CdkHeaderRowDef | CdkFooterRowDef | CdkColumnDef,
    ) => {
      return acc || d.hasStickyChanged();
    };

    // Note that the check needs to occur for every definition since it notifies the definition
    // that it can reset its dirty state. Using another operator like `some` may short-circuit
    // remaining definitions and leave them in an unchecked state.

    if (this._headerRowDefs.reduce(stickyCheckReducer, false)) {
      this.updateStickyHeaderRowStyles();
    }

    if (this._footerRowDefs.reduce(stickyCheckReducer, false)) {
      this.updateStickyFooterRowStyles();
    }

    if (Array.from(this._columnDefsByName.values()).reduce(stickyCheckReducer, false)) {
      this._stickyColumnStylesNeedReset = true;
      this.updateStickyColumnStyles();
    }
  }

  /**
   * Creates the sticky styler that will be used for sticky rows and columns. Listens