@grafana/ui/dist/cjs/components/CustomScrollbar/ScrollIndicators.cjs

Grafana Components Library

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var jsxRuntime = require('react/jsx-runtime');
var css = require('@emotion/css');
var React = require('react');
var ThemeContext = require('../../themes/ThemeContext.cjs');

"use strict";
const ScrollIndicators = ({ children }) => {
  const [showScrollTopIndicator, setShowTopScrollIndicator] = React.useState(false);
  const [showScrollBottomIndicator, setShowBottomScrollIndicator] = React.useState(false);
  const scrollTopMarker = React.useRef(null);
  const scrollBottomMarker = React.useRef(null);
  const styles = ThemeContext.useStyles2(getStyles);
  React.useEffect(() => {
    const intersectionObserver = new IntersectionObserver((entries) => {
      entries.forEach((entry) => {
        if (entry.target === scrollTopMarker.current) {
          setShowTopScrollIndicator(!entry.isIntersecting);
        } else if (entry.target === scrollBottomMarker.current) {
          setShowBottomScrollIndicator(!entry.isIntersecting);
        }
      });
    });
    [scrollTopMarker, scrollBottomMarker].forEach((ref) => {
      if (ref.current) {
        intersectionObserver.observe(ref.current);
      }
    });
    return () => intersectionObserver.disconnect();
  }, []);
  return /* @__PURE__ */ jsxRuntime.jsxs(jsxRuntime.Fragment, { children: [
    /* @__PURE__ */ jsxRuntime.jsx(
      "div",
      {
        className: css.cx(styles.scrollIndicator, styles.scrollTopIndicator, {
          [styles.scrollIndicatorVisible]: showScrollTopIndicator
        })
      }
    ),
    /* @__PURE__ */ jsxRuntime.jsxs("div", { className: styles.scrollContent, children: [
      /* @__PURE__ */ jsxRuntime.jsx("div", { ref: scrollTopMarker }),
      children,
      /* @__PURE__ */ jsxRuntime.jsx("div", { ref: scrollBottomMarker })
    ] }),
    /* @__PURE__ */ jsxRuntime.jsx(
      "div",
      {
        className: css.cx(styles.scrollIndicator, styles.scrollBottomIndicator, {
          [styles.scrollIndicatorVisible]: showScrollBottomIndicator
        })
      }
    )
  ] });
};
const getStyles = (theme) => {
  return {
    scrollContent: css.css({
      flex: 1,
      position: "relative"
    }),
    scrollIndicator: css.css({
      height: theme.spacing(6),
      left: 0,
      opacity: 0,
      pointerEvents: "none",
      position: "absolute",
      right: 0,
      [theme.transitions.handleMotion("no-preference", "reduce")]: {
        transition: theme.transitions.create("opacity")
      },
      zIndex: 1
    }),
    scrollTopIndicator: css.css({
      background: `linear-gradient(0deg, transparent, ${theme.colors.background.canvas})`,
      top: 0
    }),
    scrollBottomIndicator: css.css({
      background: `linear-gradient(180deg, transparent, ${theme.colors.background.canvas})`,
      bottom: 0
    }),
    scrollIndicatorVisible: css.css({
      opacity: 1
    })
  };
};

exports.ScrollIndicators = ScrollIndicators;
//# sourceMappingURL=ScrollIndicators.cjs.map