# All files / src/layout LayoutNavigationHeader.tsx

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     import { cnb } from "cnbuilder";
    import type { ReactNode } from "react";
    import { forwardRef } from "react";
    import { AppBar, AppBarTitle } from "../app-bar";
    import { bem } from "../utils";
    import { LayoutCloseNavigationButton } from "./LayoutCloseNavigationButton";
    import { useLayoutConfig } from "./LayoutProvider";
    import type { LayoutNavigationHeaderProps } from "./types";

    const styles = bem("rmd-layout-nav-header");

    /**
     * The default implementation for the `AppBar` within the `LayoutNavigation`
     * that allows for rendering a title along with the `LayoutCloseNavigationButton`.
     */
    export const LayoutNavigationHeader = forwardRef<
      HTMLDivElement,
      LayoutNavigationHeaderProps
    >(function LayoutNavigationHeader(props, ref) {
      const {
        theme = "clear",
        children,
        className,
        closeNav,
        closeNavProps,
        title: propTitle,
        titleProps,
        disableBorderBottom = false,
        ...remaining
      } = props;

      const { layout } = useLayoutConfig();
      if (layout === "clipped" || layout === "floating") {
        return null;
      }

      let title: ReactNode = null;
      if (propTitle) {
        title = (
          <AppBarTitle key="title" {...titleProps}>
            {propTitle}
          </AppBarTitle>
        );
      }

      let action = closeNav;
      if (typeof action === "undefined") {
        action = <LayoutCloseNavigationButton key="close" {...closeNavProps} />;
      }

      return (
        <AppBar
          {...remaining}
          ref={ref}
          theme={theme}
          className={cnb(styles({ bordered: !disableBorderBottom }), className)}
        >
          {title}
          {children}
          {action}
        </AppBar>
      );
    });