{"version":3,"file":"index.cjs","sources":["../src/index.ts"],"sourcesContent":["interface BodyScrollOptions {\n reserveScrollbarGutter?: boolean\n /** @deprecated use reserveScrollbarGutter instead */\n reserveScrollBarGap?: boolean\n allowTouchMove?: (el: EventTarget) => boolean\n}\n\ninterface HtmlStyleType {\n height: string\n overflow: string\n}\n\ntype BodyStyleType = HtmlStyleType & {\n position: string\n top: string\n left: string\n width: string\n}\n\ntype HandleScrollEvent = TouchEvent\n\ninterface Lock {\n targetElement: HTMLElement\n options: BodyScrollOptions\n}\n\n/**\n * Determines the type of scroll lock required for the current device.\n * @returns {'overflow' | 'fixed'} The type of scroll lock required.\n *\n * Note: From iOS 16 onwards, using 'overflow: hidden' is possible and is a less complex solution.\n */\nconst getScrollLockType = (): 'overflow' | 'fixed' => {\n if (typeof window === 'undefined' || !window.navigator) {\n return 'overflow'\n }\n\n const isIosDevice = /iP(ad|hone|od)/.test(window.navigator.platform) && window.navigator.maxTouchPoints > 1\n if (!isIosDevice) {\n return 'overflow'\n }\n\n const match = window.navigator.userAgent.match(/Version\\/(\\d+\\.\\d+)/)\n return match && parseInt(match[1]) >= 16 ? 'overflow' : 'fixed'\n}\n\nconst isPositionFixedRequired = getScrollLockType() === 'fixed'\n\n// Feature detect passive events\nlet hasPassiveEvents = false\nif (typeof window !== 'undefined') {\n const passiveTestOptions: AddEventListenerOptions = {\n get passive() {\n hasPassiveEvents = true\n return undefined\n }\n }\n\n window.addEventListener('__BSL_TEST_PASSIVE__', () => ({}), passiveTestOptions)\n window.removeEventListener('__BSL_TEST_PASSIVE__', () => ({}), passiveTestOptions)\n}\n\nlet locks: Array = []\nconst locksIndex = new Map()\n\nlet documentListenerAdded = false\nlet initialClientY = -1\nlet htmlStyle: HtmlStyleType | undefined\nlet bodyStyle: BodyStyleType | undefined\nlet previousOverflowSetting: string | undefined\nlet previousScrollbarGutter: string | boolean | undefined\n\n/**\n * Determines if the element should allow touchmove events.\n * @param {EventTarget} el - The event target element.\n * @returns {boolean} True if the element should allow touchmove events, false otherwise.\n */\nconst allowTouchMove = (el: EventTarget): boolean => {\n return locks.some((lock) => lock.options.allowTouchMove?.(el))\n}\n\n/**\n * Prevents the default behavior for touch events if necessary.\n * @param {HandleScrollEvent} rawEvent - The raw touch event.\n * @returns {boolean} True if default behavior should not be prevented, false otherwise.\n */\nconst preventDefault = (rawEvent: HandleScrollEvent): boolean => {\n const event = rawEvent || window.event\n\n if (allowTouchMove(event.target as Element)) {\n return true\n }\n if (event.touches.length > 1) {\n return true\n }\n\n if (event.preventDefault) {\n event.preventDefault()\n }\n return false\n}\n\n/**\n * Sets overflow to hidden and optionally reserves scrollbar gap.\n * @param {BodyScrollOptions} [options] - The options for setting overflow hidden.\n */\nconst setOverflowHidden = (options?: BodyScrollOptions): void => {\n const reserveScrollbarGutter = options?.reserveScrollbarGutter ?? options?.reserveScrollBarGap\n\n if (reserveScrollbarGutter && previousScrollbarGutter === undefined) {\n const scrollbarGutterPropertySupported = CSS.supports('scrollbar-gutter', 'stable')\n\n if (scrollbarGutterPropertySupported) {\n previousScrollbarGutter = true\n document.documentElement.style.scrollbarGutter = 'stable'\n } else {\n const scrollBarGap = window.innerWidth - document.documentElement.getBoundingClientRect().width\n\n if (scrollBarGap > 0) {\n const computedBodyPaddingRight = parseInt(window.getComputedStyle(document.body).getPropertyValue('padding-right'), 10)\n previousScrollbarGutter = document.body.style.paddingRight\n document.body.style.paddingRight = `${computedBodyPaddingRight + scrollBarGap}px`\n }\n }\n }\n\n if (previousOverflowSetting === undefined) {\n previousOverflowSetting = document.body.style.overflow\n document.body.style.overflow = 'hidden'\n }\n}\n\n/**\n * Restores the previous overflow settings.\n */\nconst restoreOverflowSetting = (): void => {\n if (previousScrollbarGutter !== undefined) {\n const scrollbarGutterPropertySupported = CSS.supports('scrollbar-gutter', 'stable')\n\n if (scrollbarGutterPropertySupported) {\n document.documentElement.style.scrollbarGutter = ''\n } else {\n document.body.style.paddingRight = previousScrollbarGutter as string\n }\n\n previousScrollbarGutter = undefined\n }\n\n if (previousOverflowSetting !== undefined) {\n document.body.style.overflow = previousOverflowSetting\n previousOverflowSetting = undefined\n }\n}\n\n/**\n * Sets the body position to fixed and locks the scroll.\n */\nconst setPositionFixed = (): void => {\n window.requestAnimationFrame(() => {\n const $html = document.documentElement\n const $body = document.body\n\n if (bodyStyle === undefined) {\n htmlStyle = { ...$html.style }\n bodyStyle = { ...$body.style }\n\n const { scrollY, scrollX, innerHeight } = window\n\n $html.style.height = '100%'\n $html.style.overflow = 'hidden'\n $html.style.setProperty('--bsl-top', `${scrollY}px`)\n\n $body.style.position = 'fixed'\n $body.style.top = `${-scrollY}px`\n $body.style.left = `${-scrollX}px`\n $body.style.width = '100%'\n $body.style.height = 'auto'\n $body.style.overflow = 'hidden'\n\n setTimeout(() => window.requestAnimationFrame(() => {\n const bottomBarHeight = innerHeight - window.innerHeight\n if (bottomBarHeight && scrollY >= innerHeight) {\n $body.style.top = `${-(scrollY + bottomBarHeight)}px`\n }\n }), 300)\n }\n })\n}\n\n/**\n * Restores the previous body and html position settings.\n */\nconst restorePositionSetting = (): void => {\n if (bodyStyle !== undefined) {\n const $html = document.documentElement\n const $body = document.body\n\n const y = -parseInt($body.style.top, 10)\n const x = -parseInt($body.style.left, 10)\n\n $html.style.height = htmlStyle?.height ?? ''\n $html.style.overflow = htmlStyle?.overflow ?? ''\n $html.style.removeProperty('--bsl-top')\n\n $body.style.position = bodyStyle.position || ''\n $body.style.top = bodyStyle.top || ''\n $body.style.left = bodyStyle.left || ''\n $body.style.width = bodyStyle.width || ''\n $body.style.height = bodyStyle.height || ''\n $body.style.overflow = bodyStyle.overflow || ''\n\n const scrollBehaviorPropertySupported = CSS.supports('scroll-behavior', 'smooth')\n if (scrollBehaviorPropertySupported) {\n window.scrollTo({ left: x, top: y, behavior: 'instant' })\n } else {\n window.scrollTo(x, y)\n }\n\n bodyStyle = undefined\n }\n}\n\n/**\n * Checks if the target element is totally scrolled.\n * @param {HTMLElement} targetElement - The target element.\n * @returns {boolean} True if the target element is totally scrolled, false otherwise.\n */\nconst isTargetElementTotallyScrolled = (targetElement: HTMLElement): boolean => {\n return targetElement ? targetElement.scrollHeight - targetElement.scrollTop <= targetElement.clientHeight : false\n}\n\n/**\n * Handles the scroll event for the target element.\n * @param {HandleScrollEvent} event - The scroll event.\n * @param {HTMLElement} targetElement - The target element.\n * @returns {boolean} True if the event should not be prevented, false otherwise.\n */\nconst handleScroll = (event: HandleScrollEvent, targetElement: HTMLElement): boolean => {\n const clientY = event.targetTouches[0].clientY - initialClientY\n\n if (allowTouchMove(event.target!)) {\n return false\n }\n\n if (targetElement && targetElement.scrollTop === 0 && clientY > 0) {\n return preventDefault(event)\n }\n\n if (isTargetElementTotallyScrolled(targetElement) && clientY < 0) {\n return preventDefault(event)\n }\n\n event.stopPropagation()\n return true\n}\n\n/**\n * Disables body scroll for the target element.\n * @param {HTMLElement} targetElement - The target element.\n * @param {BodyScrollOptions} [options] - The options for disabling body scroll.\n */\nexport const disableBodyScroll = (targetElement: HTMLElement, options?: BodyScrollOptions): void => {\n if (!targetElement) {\n console.error('disableBodyScroll unsuccessful - targetElement must be provided when calling disableBodyScroll.')\n return\n }\n\n locksIndex.set(targetElement, (locksIndex.get(targetElement) ?? 0) + 1)\n\n if (locks.some((lock) => lock.targetElement === targetElement)) {\n return\n }\n\n const lock = { targetElement, options: options ?? {} }\n locks = [...locks, lock]\n\n if (isPositionFixedRequired) {\n setPositionFixed()\n } else {\n setOverflowHidden(options)\n }\n\n if (isPositionFixedRequired) {\n targetElement.ontouchstart = (event: HandleScrollEvent) => {\n if (event.targetTouches.length === 1) {\n initialClientY = event.targetTouches[0].clientY\n }\n }\n targetElement.ontouchmove = (event: HandleScrollEvent) => {\n if (event.targetTouches.length === 1) {\n handleScroll(event, targetElement)\n }\n }\n\n if (!documentListenerAdded) {\n document.addEventListener('touchmove', preventDefault, hasPassiveEvents ? { passive: false } : undefined)\n documentListenerAdded = true\n }\n }\n}\n\n/**\n * Clears all body scroll locks.\n */\nexport const clearAllBodyScrollLocks = (): void => {\n if (isPositionFixedRequired) {\n locks.forEach((lock) => {\n lock.targetElement.ontouchstart = null\n lock.targetElement.ontouchmove = null\n })\n\n if (documentListenerAdded) {\n document.removeEventListener('touchmove', preventDefault)\n documentListenerAdded = false\n }\n\n initialClientY = -1\n }\n\n if (isPositionFixedRequired) {\n restorePositionSetting()\n } else {\n restoreOverflowSetting()\n }\n\n locks = []\n locksIndex.clear()\n}\n\n/**\n * Enables body scroll for the target element.\n * @param {HTMLElement} targetElement - The target element.\n */\nexport const enableBodyScroll = (targetElement: HTMLElement): void => {\n if (!targetElement) {\n console.error('enableBodyScroll unsuccessful - targetElement must be provided when calling enableBodyScroll.')\n return\n 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