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

import { observer } from "mobx-react";
// components
import { MultipleSelectGroupAction } from "@/components/core";
import { IBlockUpdateData, IGanttBlock } from "@/components/gantt-chart";
// helpers
import { cn } from "@/helpers/common.helper";
// hooks
import { TSelectionHelper } from "@/hooks/use-multiple-select";
// constants
import { GANTT_SELECT_GROUP, HEADER_HEIGHT, SIDEBAR_WIDTH } from "../constants";

type Props = {
  blocks: IGanttBlock[] | null;
  blockUpdateHandler: (block: any, payload: IBlockUpdateData) => void;
  enableReorder: boolean;
  enableSelection: boolean;
  sidebarToRender: (props: any) => React.ReactNode;
  title: string;
  quickAdd?: React.JSX.Element | undefined;
  selectionHelpers: TSelectionHelper;
};

export const GanttChartSidebar: React.FC<Props> = observer((props) => {
  const {
    blocks,
    blockUpdateHandler,
    enableReorder,
    enableSelection,
    sidebarToRender,
    title,
    quickAdd,
    selectionHelpers,
  } = props;

  const isGroupSelectionEmpty = selectionHelpers.isGroupSelected(GANTT_SELECT_GROUP) === "empty";

  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: `${SIDEBAR_WIDTH}px`,
      }}
    >
      <div
        className="group/list-header box-border flex-shrink-0 flex items-end justify-between gap-2 border-b-[0.5px] border-custom-border-200 pb-2 pl-2 pr-4 text-sm font-medium text-custom-text-300 sticky top-0 z-10 bg-custom-background-100"
        style={{
          height: `${HEADER_HEIGHT}px`,
        }}
      >
        <div
          className={cn("flex items-center gap-2", {
            "pl-2": !enableSelection,
          })}
        >
          {enableSelection && (
            <div className="flex-shrink-0 flex items-center w-3.5">
              <MultipleSelectGroupAction
                className={cn(
                  "size-3.5 opacity-0 pointer-events-none group-hover/list-header:opacity-100 group-hover/list-header:pointer-events-auto !outline-none",
                  {
                    "opacity-100 pointer-events-auto": !isGroupSelectionEmpty,
                  }
                )}
                groupID={GANTT_SELECT_GROUP}
                selectionHelpers={selectionHelpers}
              />
            </div>
          )}
          <h6>{title}</h6>
        </div>
        <h6>Duration</h6>
      </div>

      <div className="min-h-full h-max bg-custom-background-100 overflow-hidden">
        {sidebarToRender?.({ title, blockUpdateHandler, blocks, enableReorder, enableSelection, selectionHelpers })}
      </div>
      {quickAdd ? quickAdd : null}
    </div>
  );
});