# All files / src/main-layout MainLayoutAppBar.tsx

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     import { cnb } from "cnbuilder";
    import type { ReactNode } from "react";
    import { forwardRef, useCallback, useMemo, useState } from "react";
    import type { AppBarProps } from "../app-bar";
    import { AppBar } from "../app-bar";
    import type { DefinedCSSVariableName } from "../theme";
    import { useCSSVariables } from "../theme";
    import type { CssPosition, PropsWithRef } from "../types";
    import { useResizeObserver } from "../useResizeObserver";
    import type { MainLayoutTitleProps } from "./MainLayoutTitle";
    import { MainLayoutTitle } from "./MainLayoutTitle";
    import type { ConfigurableMainLayoutNavigationButtonProps } from "./MainLayoutNavigationButton";
    import { MainLayoutNavigationButton } from "./MainLayoutNavigationButton";
    import { useMainLayout } from "./useMainLayout";
    import type { CSSTransitionClassNames, TransitionTimeout } from "../transition";
    import { useCSSTransition } from "../transition";
    import { DEFAULT_SHEET_TIMEOUT } from "../sheet";

    export interface MainLayoutAppBarProps extends Omit<AppBarProps, "title"> {
      /**
       * @defaultValue `"sticky"`
       */
      position?: CssPosition;
      children?: ReactNode;

      title?: ReactNode;
      titleProps?: PropsWithRef<MainLayoutTitleProps, HTMLHeadingElement>;

      navigationButtonProps?: ConfigurableMainLayoutNavigationButtonProps;

      timeout?: TransitionTimeout;
      classNames?: CSSTransitionClassNames;
    }

    const MAIN_LAYOUT_APP_BAR_CLASSNAMES: CSSTransitionClassNames = {
      enter: "rmd-layout-header--enter",
      enterActive: "rmd-layout-header--nav-offset",
      enterDone: "rmd-layout-header--nav-offset",
      exit: "rmd-layout-header--exit",
    };

    export const MainLayoutAppBar = forwardRef<
      HTMLDivElement,
      MainLayoutAppBarProps
    >(function MainLayoutAppBar(props, ref) {
      const {
        className,
        children,
        position = "sticky",
        navigationButtonProps,
        title: propTitle,
        titleProps,
        timeout = DEFAULT_SHEET_TIMEOUT,
        classNames = MAIN_LAYOUT_APP_BAR_CLASSNAMES,
        ...remaining
      } = props;

      let nav: ReactNode;
      if (navigationButtonProps !== null) {
        nav = <MainLayoutNavigationButton {...navigationButtonProps} />;
      }

      let title: ReactNode;
      if (propTitle) {
        title = (
          <MainLayoutTitle keyline={nav ? "nav" : "small"} {...titleProps}>
            {propTitle}
          </MainLayoutTitle>
        );
      }

      const [height, setHeight] = useState<number | undefined>();
      const targetRef = useResizeObserver({
        ref,
        onUpdate: useCallback((entry) => {
          setHeight(entry.borderBoxSize[0].blockSize);
        }, []),
        disableWidth: true,
      });
      useCSSVariables<DefinedCSSVariableName>(
        useMemo(() => {
          if (typeof height !== "number") {
            return [];
          }

          return [{ name: "--rmd-layout-header-offset", value: `${height}px` }];
        }, [height])
      );

      const {
        variant,
        expanded,
        layout,
        currentLayout,
        disablePersistentTransition,
      } = useMainLayout();
      console.log("layout:", layout);
      console.log("currentLayout:", currentLayout);
      const { elementProps } = useCSSTransition({
        nodeRef: targetRef,
        timeout:
          disablePersistentTransition.current || layout !== currentLayout
            ? 0
            : timeout,
        classNames,
        transitionIn:
          expanded &&
          currentLayout !== "temporary" &&
          currentLayout !== "temporary-mini" &&
          variant === "full-height",
        className: cnb("rmd-layout-header", className),
      });

      return (
        <AppBar {...remaining} {...elementProps} position={position}>
          {nav}
          {title}
          {children}
        </AppBar>
      );
    });