plane/web/components/gantt-chart/sidebar/root.tsx

// components
import { ChartDataType, IBlockUpdateData, IGanttBlock } from "components/gantt-chart";
// constants
import { HEADER_HEIGHT, SIDEBAR_WIDTH } from "../constants";

type Props = {
  blockIds: string[];
  blockUpdateHandler: (block: any, payload: IBlockUpdateData) => void;
  loadMoreBlocks?: () => void;
  enableReorder: boolean;
  sidebarToRender: (props: any) => React.ReactNode;
  title: string;
  getBlockById: (id: string, currentViewData?: ChartDataType | undefined) => IGanttBlock;
  quickAdd?: React.JSX.Element | undefined;
};

export const GanttChartSidebar: React.FC<Props> = (props) => {
  const {
    blockIds,
    blockUpdateHandler,
    enableReorder,
    sidebarToRender,
    getBlockById,
    loadMoreBlocks,
    title,
    quickAdd,
  } = props;

  return (
    <div
      // DO NOT REMOVE THE ID
      id="gantt-sidebar"
      className="sticky left-0 z-10 min-h-full h-max flex-shrink-0 border-r-[0.5px] border-custom-border-200 bg-custom-background-100"
      style={{
        width: `${SIDEBAR_WIDTH}px`,
      }}
    >
      <div
        className="box-border flex-shrink-0 flex items-end justify-between gap-2 border-b-[0.5px] border-custom-border-200 pb-2 pl-8 pr-4 text-sm font-medium text-custom-text-300 sticky top-0 z-10 bg-custom-background-100"
        style={{
          height: `${HEADER_HEIGHT}px`,
        }}
      >
        <h6>{title}</h6>
        <h6>Duration</h6>
      </div>

      <div className="min-h-full h-max bg-custom-background-100 overflow-x-hidden overflow-y-auto">
        {sidebarToRender &&
          sidebarToRender({ title, blockUpdateHandler, blockIds, getBlockById, enableReorder, loadMoreBlocks })}
      </div>
      {quickAdd ? quickAdd : null}
    </div>
  );
};