/**
 * Copyright IBM Corp. 2020, 2026
 *
 * This source code is licensed under the Apache-2.0 license found in the
 * LICENSE file in the root directory of this source tree.
 */

const require_runtime = require("../../_virtual/_rolldown/runtime.js");
const require_index = require("../../node_modules/classnames/index.js");
const require_settings = require("../../settings.js");
const require_useIsomorphicEffect = require("../../global/js/hooks/useIsomorphicEffect.js");
const require_devtools = require("../../global/js/utils/devtools.js");
const require_constants = require("./constants.js");
let react = require("react");
react = require_runtime.__toESM(react);
let prop_types = require("prop-types");
prop_types = require_runtime.__toESM(prop_types);
let _carbon_react = require("@carbon/react");
//#region src/components/ScrollGradient/ScrollGradient.jsx
/**
* Copyright IBM Corp. 2024, 2025
*
* This source code is licensed under the Apache-2.0 license found in the
* LICENSE file in the root directory of this source tree.
*/
var import_classnames = /* @__PURE__ */ require_runtime.__toESM(require_index.default);
const blockClass = `${require_settings.pkg.prefix}--scroll-gradient`;
const componentName = "ScrollGradient";
const defaults = {
	hideStartGradient: false,
	onScroll: () => {},
	getScrollElementRef: () => {}
};
/**
* TODO: A description of the component.
*/
let ScrollGradient = react.default.forwardRef(({ children, className, color, onScroll = defaults.onScroll, scrollElementClassName, getScrollElementRef = defaults.getScrollElementRef, hideStartGradient = defaults.hideStartGradient, ...rest }, ref) => {
	const intersectionStartRef = (0, react.useRef)(void 0);
	const intersectionEndRef = (0, react.useRef)(void 0);
	const intersectionLeftRef = (0, react.useRef)(void 0);
	const intersectionRightRef = (0, react.useRef)(void 0);
	const fallbackColor = `var(--${(0, _carbon_react.usePrefix)()}-layer-01)`;
	const scrollContainer = (0, react.useRef)(void 0);
	const contentChildrenContainer = (0, react.useRef)(void 0);
	const { xScrollable, yScrollable } = require_constants.useIsOverflow(scrollContainer);
	const gradientRight = yScrollable && scrollContainer.current && contentChildrenContainer.current ? scrollContainer.current.offsetWidth - contentChildrenContainer.current.offsetWidth : 0;
	const gradientBottom = xScrollable && scrollContainer.current && contentChildrenContainer.current ? scrollContainer.current.offsetHeight - contentChildrenContainer.current.offsetHeight : 0;
	const [verticalPosition] = (0, react.useState)(require_constants.ScrollStates.NONE);
	const [horizontalPosition] = (0, react.useState)(require_constants.ScrollStates.NONE);
	const startVerticalRef = (0, react.useRef)(null);
	const startHorizontalRef = (0, react.useRef)(null);
	const endVerticalRef = (0, react.useRef)(null);
	const endHorizontalRef = (0, react.useRef)(null);
	require_useIsomorphicEffect.useIsomorphicEffect(() => {
		startVerticalRef.current.style.right = gradientRight;
		startVerticalRef.current.style.backgroundImage = `linear-gradient(0deg, transparent, ${color ?? fallbackColor} 90%)`;
		startHorizontalRef.current.backgroundImage = `linear-gradient(-90deg, transparent, ${color ?? fallbackColor} 90%)`;
		startHorizontalRef.current.bottom = gradientBottom;
		endVerticalRef.current.style.right = gradientRight;
		endVerticalRef.current.style.bottom = gradientBottom;
		endVerticalRef.current.style.backgroundImage = `linear-gradient(0deg, ${color ?? fallbackColor} 10%, transparent)`;
		endHorizontalRef.current.style.right = gradientRight;
		endHorizontalRef.current.style.bottom = gradientBottom;
		endHorizontalRef.current.style.backgroundImage = `linear-gradient(-90deg, ${color ?? fallbackColor} 10%, transparent)`;
	}, [
		color,
		gradientRight,
		gradientBottom
	]);
	const setGradientOnIntersection = (entry, gradientRef) => {
		if (gradientRef.current) if (entry.isIntersecting) {
			gradientRef.current.style.opacity = 0;
			gradientRef.current.style.display = "none";
			gradientRef?.current.setAttribute("aria-hidden", false);
		} else {
			gradientRef.current.style.opacity = 1;
			gradientRef.current.style.display = "block";
			gradientRef?.current.setAttribute("aria-hidden", true);
		}
	};
	(0, react.useEffect)(() => {
		const observer = new IntersectionObserver((entries) => {
			entries.forEach((entry) => {
				if (entry.target.hasAttribute("data-start-vertical")) setGradientOnIntersection(entry, startVerticalRef);
				if (entry.target.hasAttribute("data-end-vertical")) setGradientOnIntersection(entry, endVerticalRef);
				if (entry.target.hasAttribute("data-start-horizontal")) setGradientOnIntersection(entry, startHorizontalRef);
				if (entry.target.hasAttribute("data-end-horizontal")) setGradientOnIntersection(entry, endHorizontalRef);
			});
		}, {
			root: null,
			rootMargin: "0px",
			threshold: .1
		});
		observer.observe(intersectionStartRef.current);
		observer.observe(intersectionEndRef.current);
		observer.observe(intersectionLeftRef.current);
		observer.observe(intersectionRightRef.current);
		const startVerticalRefValue = intersectionStartRef.current;
		const endVerticalRefValue = intersectionEndRef.current;
		const startHorizontalRefValue = intersectionLeftRef.current;
		const endHorizontalRefValue = intersectionRightRef.current;
		return () => {
			observer.unobserve(startVerticalRefValue);
			observer.unobserve(endVerticalRefValue);
			observer.unobserve(startHorizontalRefValue);
			observer.unobserve(endHorizontalRefValue);
		};
	}, []);
	const setRefs = (element) => {
		scrollContainer.current = element;
		getScrollElementRef(element);
	};
	return /* @__PURE__ */ react.default.createElement("div", {
		...rest,
		className: (0, import_classnames.default)(blockClass, `${blockClass}--x-${horizontalPosition.toLowerCase()}`, `${blockClass}--y-${verticalPosition.toLowerCase()}`, {
			[`${blockClass}--x-scrollable`]: xScrollable,
			[`${blockClass}--y-scrollable`]: yScrollable
		}, className),
		ref,
		role: "presentation",
		...require_devtools.getDevtoolsProps(componentName)
	}, /* @__PURE__ */ react.default.createElement("div", {
		onScroll,
		ref: setRefs,
		className: (0, import_classnames.default)(`${blockClass}__content`, scrollElementClassName)
	}, /* @__PURE__ */ react.default.createElement("span", {
		ref: intersectionStartRef,
		"data-start-vertical": true
	}), /* @__PURE__ */ react.default.createElement("span", {
		ref: intersectionLeftRef,
		"data-start-horizontal": true
	}), /* @__PURE__ */ react.default.createElement("div", {
		ref: contentChildrenContainer,
		className: `${blockClass}__content-children`
	}, children), /* @__PURE__ */ react.default.createElement("span", {
		ref: intersectionEndRef,
		"data-end-vertical": true
	}), /* @__PURE__ */ react.default.createElement("span", {
		ref: intersectionRightRef,
		"data-end-horizontal": true
	})), !hideStartGradient && /* @__PURE__ */ react.default.createElement(react.default.Fragment, null, /* @__PURE__ */ react.default.createElement("div", {
		ref: startVerticalRef,
		className: `${blockClass}__start-vertical`,
		role: "presentation",
		"aria-hidden": true
	}), /* @__PURE__ */ react.default.createElement("div", {
		ref: startHorizontalRef,
		className: `${blockClass}__start-horizontal`,
		role: "presentation",
		"aria-hidden": true
	})), /* @__PURE__ */ react.default.createElement("div", {
		ref: endVerticalRef,
		className: `${blockClass}__end-vertical`,
		role: "presentation",
		"aria-hidden": true
	}), /* @__PURE__ */ react.default.createElement("div", {
		ref: endHorizontalRef,
		className: `${blockClass}__end-horizontal`,
		role: "presentation",
		"aria-hidden": true
	}));
});
ScrollGradient = require_settings.pkg.checkComponentEnabled(ScrollGradient, componentName);
ScrollGradient.displayName = componentName;
ScrollGradient.propTypes = {
	/**
	* Provide the contents of the ScrollGradient.
	*/
	children: prop_types.default.oneOfType([prop_types.default.arrayOf(prop_types.default.node), prop_types.default.node]),
	/**
	* Provide an optional class to be applied to the containing node.
	*/
	className: prop_types.default.string,
	/** @type {string} Fade out color. Any valid CSS color value works */
	color: prop_types.default.string,
	/** @type {(element: HTMLElement) => {}} Optional function to get reference to scrollable DOM element */
	getScrollElementRef: prop_types.default.func,
	/** @type {boolean} Set to true if you want to hide gradient on the start side (top or left) of scrollable element. */
	hideStartGradient: prop_types.default.bool,
	/** @type {Function} Optional scroll handler */
	onScroll: prop_types.default.func,
	/** @type {string} Optional classname for scroll element. */
	scrollElementClassName: prop_types.default.string
};
//#endregion
Object.defineProperty(exports, "ScrollGradient", {
	enumerable: true,
	get: function() {
		return ScrollGradient;
	}
});
