@base-ui-components/react/esm/scroll-area/thumb/ScrollAreaThumb.js

Base UI is a library of headless ('unstyled') React components and low-level hooks. You gain complete control over your app's CSS and accessibility features.

'use client';

import * as React from 'react';
import PropTypes from 'prop-types';
import { useComponentRenderer } from '../../utils/useComponentRenderer.js';
import { useScrollAreaRootContext } from '../root/ScrollAreaRootContext.js';
import { useForkRef } from '../../utils/useForkRef.js';
import { mergeReactProps } from '../../utils/mergeReactProps.js';
import { useScrollAreaScrollbarContext } from '../scrollbar/ScrollAreaScrollbarContext.js';
import { ScrollAreaScrollbarCssVars } from '../scrollbar/ScrollAreaScrollbarCssVars.js';

/**
 * The draggable part of the the scrollbar that indicates the current scroll position.
 * Renders a `<div>` element.
 *
 * Documentation: [Base UI Scroll Area](https://base-ui.com/react/components/scroll-area)
 */
const ScrollAreaThumb = /*#__PURE__*/React.forwardRef(function ScrollAreaThumb(props, forwardedRef) {
  const {
    render,
    className,
    ...otherProps
  } = props;
  const {
    thumbYRef,
    thumbXRef,
    handlePointerDown,
    handlePointerMove,
    handlePointerUp,
    setScrolling
  } = useScrollAreaRootContext();
  const {
    orientation
  } = useScrollAreaScrollbarContext();
  const mergedRef = useForkRef(forwardedRef, orientation === 'vertical' ? thumbYRef : thumbXRef);
  const state = React.useMemo(() => ({
    orientation
  }), [orientation]);
  const {
    renderElement
  } = useComponentRenderer({
    render: render ?? 'div',
    ref: mergedRef,
    className,
    state,
    extraProps: mergeReactProps(otherProps, {
      onPointerDown: handlePointerDown,
      onPointerMove: handlePointerMove,
      onPointerUp(event) {
        setScrolling(false);
        handlePointerUp(event);
      },
      style: {
        ...(orientation === 'vertical' && {
          height: `var(${ScrollAreaScrollbarCssVars.scrollAreaThumbHeight})`
        }),
        ...(orientation === 'horizontal' && {
          width: `var(${ScrollAreaScrollbarCssVars.scrollAreaThumbWidth})`
        })
      }
    })
  });
  return renderElement();
});
process.env.NODE_ENV !== "production" ? ScrollAreaThumb.propTypes /* remove-proptypes */ = {
  // ┌────────────────────────────── Warning ──────────────────────────────┐
  // │ These PropTypes are generated from the TypeScript type definitions. │
  // │ To update them, edit the TypeScript types and run `pnpm proptypes`. │
  // └─────────────────────────────────────────────────────────────────────┘
  /**
   * @ignore
   */
  children: PropTypes.node,
  /**
   * CSS class applied to the element, or a function that
   * returns a class based on the component’s state.
   */
  className: PropTypes.oneOfType([PropTypes.func, PropTypes.string]),
  /**
   * Allows you to replace the component’s HTML element
   * with a different tag, or compose it with another component.
   *
   * Accepts a `ReactElement` or a function that returns the element to render.
   */
  render: PropTypes.oneOfType([PropTypes.element, PropTypes.func])
} : void 0;
export { ScrollAreaThumb };