{"version":3,"sources":["../packages/snap/src/debounce.ts","../packages/snap/src/element.ts","../packages/snap/src/uid.ts","../packages/snap/src/snap.ts"],"sourcesContent":["export function debounce void>(\r\n callback: CB,\r\n delay: number\r\n) {\r\n let timer: ReturnType | undefined\r\n return function (this: T, ...args: Parameters): void {\r\n let context = this\r\n clearTimeout(timer)\r\n timer = setTimeout(() => {\r\n timer = undefined\r\n callback.apply(context, args)\r\n }, delay)\r\n }\r\n}\r\n","import { debounce } from './debounce'\r\n\r\nfunction removeParentSticky(element: HTMLElement) {\r\n const position = getComputedStyle(element).position\r\n\r\n const isSticky = position === 'sticky'\r\n\r\n if (isSticky) {\r\n element.style.setProperty('position', 'static')\r\n element.dataset.sticky = 'true'\r\n }\r\n\r\n if (element.offsetParent) {\r\n removeParentSticky(element.offsetParent as HTMLElement)\r\n }\r\n}\r\n\r\nfunction addParentSticky(element: HTMLElement) {\r\n if (element?.dataset?.sticky === 'true') {\r\n element.style.removeProperty('position')\r\n delete element.dataset.sticky\r\n }\r\n\r\n if (element.offsetParent) {\r\n addParentSticky(element.offsetParent as HTMLElement)\r\n }\r\n}\r\n\r\nfunction offsetTop(element: HTMLElement, accumulator = 0) {\r\n const top = accumulator + element.offsetTop\r\n if (element.offsetParent) {\r\n return offsetTop(element.offsetParent as HTMLElement, top)\r\n }\r\n return top\r\n}\r\n\r\nfunction offsetLeft(element: HTMLElement, accumulator = 0) {\r\n const left = accumulator + element.offsetLeft\r\n if (element.offsetParent) {\r\n return offsetLeft(element.offsetParent as HTMLElement, left)\r\n }\r\n return left\r\n}\r\n\r\nfunction scrollTop(element: HTMLElement, accumulator = 0) {\r\n const top = accumulator + element.scrollTop\r\n if (element.offsetParent) {\r\n return scrollTop(element.offsetParent as HTMLElement, top)\r\n }\r\n return top + window.scrollY\r\n}\r\n\r\nfunction scrollLeft(element: HTMLElement, accumulator = 0) {\r\n const left = accumulator + element.scrollLeft\r\n if (element.offsetParent) {\r\n return scrollLeft(element.offsetParent as HTMLElement, left)\r\n }\r\n return left + window.scrollX\r\n}\r\n\r\nexport type SnapElementOptions = {\r\n align?: string | string[]\r\n ignoreSticky?: boolean\r\n ignoreTransform?: boolean\r\n}\r\n\r\ntype Rect = {\r\n top: number\r\n left: number\r\n width: number\r\n height: number\r\n x: number\r\n y: number\r\n bottom: number\r\n right: number\r\n element: HTMLElement\r\n}\r\n\r\nexport class SnapElement {\r\n element: HTMLElement\r\n options: SnapElementOptions\r\n align: string[]\r\n // @ts-ignore\r\n rect: Rect = {}\r\n wrapperResizeObserver: ResizeObserver\r\n resizeObserver: ResizeObserver\r\n debouncedWrapperResize: () => void\r\n\r\n constructor(\r\n element: HTMLElement,\r\n {\r\n align = ['start'],\r\n ignoreSticky = true,\r\n ignoreTransform = false,\r\n }: SnapElementOptions = {}\r\n ) {\r\n this.element = element\r\n\r\n this.options = { align, ignoreSticky, ignoreTransform }\r\n\r\n this.align = [align].flat()\r\n\r\n this.debouncedWrapperResize = debounce(this.onWrapperResize, 500)\r\n\r\n this.wrapperResizeObserver = new ResizeObserver(this.debouncedWrapperResize)\r\n this.wrapperResizeObserver.observe(document.body)\r\n this.onWrapperResize()\r\n\r\n this.resizeObserver = new ResizeObserver(this.onResize)\r\n this.resizeObserver.observe(this.element)\r\n this.setRect({\r\n width: this.element.offsetWidth,\r\n height: this.element.offsetHeight,\r\n })\r\n }\r\n\r\n destroy() {\r\n this.wrapperResizeObserver.disconnect()\r\n this.resizeObserver.disconnect()\r\n }\r\n\r\n setRect({\r\n top,\r\n left,\r\n width,\r\n height,\r\n element,\r\n }: {\r\n top?: number\r\n left?: number\r\n width?: number\r\n height?: number\r\n element?: HTMLElement\r\n } = {}) {\r\n top = top ?? this.rect.top\r\n left = left ?? this.rect.left\r\n width = width ?? this.rect.width\r\n height = height ?? this.rect.height\r\n element = element ?? this.rect.element\r\n\r\n if (\r\n top === this.rect.top &&\r\n left === this.rect.left &&\r\n width === this.rect.width &&\r\n height === this.rect.height &&\r\n element === this.rect.element\r\n )\r\n return\r\n\r\n this.rect.top = top\r\n this.rect.y = top\r\n this.rect.width = width\r\n this.rect.height = height\r\n this.rect.left = left\r\n this.rect.x = left\r\n this.rect.bottom = top + height\r\n this.rect.right = left + width\r\n }\r\n\r\n onWrapperResize = () => {\r\n let top, left\r\n\r\n if (this.options.ignoreSticky) removeParentSticky(this.element)\r\n if (this.options.ignoreTransform) {\r\n top = offsetTop(this.element)\r\n left = offsetLeft(this.element)\r\n } else {\r\n const rect = this.element.getBoundingClientRect()\r\n top = rect.top + scrollTop(this.element)\r\n left = rect.left + scrollLeft(this.element)\r\n }\r\n if (this.options.ignoreSticky) addParentSticky(this.element)\r\n\r\n this.setRect({ top, left })\r\n }\r\n\r\n onResize = ([entry]: ResizeObserverEntry[]) => {\r\n if (!entry?.borderBoxSize[0]) return\r\n const width = entry.borderBoxSize[0].inlineSize\r\n const height = entry.borderBoxSize[0].blockSize\r\n\r\n this.setRect({ width, height })\r\n }\r\n}\r\n","let index = 0\r\n\r\nexport type UID = number\r\n\r\nexport function uid(): UID {\r\n return index++\r\n}\r\n","import type Lenis from 'lenis'\r\nimport type { VirtualScrollData } from 'lenis'\r\nimport { debounce } from './debounce'\r\nimport type { SnapElementOptions } from './element'\r\nimport { SnapElement } from './element'\r\nimport type { SnapItem, SnapOptions } from './types'\r\nimport type { UID } from './uid'\r\nimport { uid } from './uid'\r\n\r\n// TODO:\r\n// - fix wheel scrolling after limits (see console scroll to)\r\n// - arrow, spacebar\r\n\r\ntype RequiredPick = Omit & Required>\r\n\r\n/**\r\n * Snap class to handle the snap functionality\r\n *\r\n * @example\r\n * const snap = new Snap(lenis, {\r\n * type: 'mandatory', // 'mandatory', 'proximity' or 'lock'\r\n * onSnapStart: (snap) => {\r\n * console.log('onSnapStart', snap)\r\n * },\r\n * onSnapComplete: (snap) => {\r\n * console.log('onSnapComplete', snap)\r\n * },\r\n * })\r\n *\r\n * snap.add(500) // snap at 500px\r\n *\r\n * const removeSnap = snap.add(500)\r\n *\r\n * if (someCondition) {\r\n * removeSnap()\r\n * }\r\n */\r\nexport class Snap {\r\n options: RequiredPick\r\n elements = new Map()\r\n snaps = new Map()\r\n viewport: { width: number; height: number } = {\r\n width: window.innerWidth,\r\n height: window.innerHeight,\r\n }\r\n isStopped = false\r\n onSnapDebounced: (e: VirtualScrollData) => void\r\n currentSnapIndex?: number\r\n\r\n constructor(\r\n private lenis: Lenis,\r\n {\r\n type = 'proximity',\r\n lerp,\r\n easing,\r\n duration,\r\n distanceThreshold = '50%', // useless when type is \"mandatory\"\r\n debounce: debounceDelay = 500,\r\n onSnapStart,\r\n onSnapComplete,\r\n }: SnapOptions = {}\r\n ) {\r\n this.options = {\r\n type,\r\n lerp,\r\n easing,\r\n duration,\r\n distanceThreshold,\r\n debounce: debounceDelay,\r\n onSnapStart,\r\n onSnapComplete,\r\n }\r\n\r\n this.onWindowResize()\r\n window.addEventListener('resize', this.onWindowResize, false)\r\n\r\n this.onSnapDebounced = debounce(this.onSnap, this.options.debounce)\r\n\r\n this.lenis.on('virtual-scroll', this.onSnapDebounced)\r\n }\r\n\r\n /**\r\n * Destroy the snap instance\r\n */\r\n destroy() {\r\n this.lenis.off('virtual-scroll', this.onSnapDebounced)\r\n window.removeEventListener('resize', this.onWindowResize, false)\r\n this.elements.forEach((element) => element.destroy())\r\n }\r\n\r\n /**\r\n * Start the snap after it has been stopped\r\n */\r\n start() {\r\n this.isStopped = false\r\n }\r\n\r\n /**\r\n * Stop the snap\r\n */\r\n stop() {\r\n this.isStopped = true\r\n }\r\n\r\n /**\r\n * Add a snap to the snap instance\r\n *\r\n * @param value The value to snap to\r\n * @param userData User data that will be forwarded through the snap event\r\n * @returns Unsubscribe function\r\n */\r\n add(value: number): () => void {\r\n const id = uid()\r\n\r\n this.snaps.set(id, { value })\r\n\r\n return () => this.snaps.delete(id)\r\n }\r\n\r\n /**\r\n * Add an element to the snap instance\r\n *\r\n * @param element The element to add\r\n * @param options The options for the element\r\n * @returns Unsubscribe function\r\n */\r\n addElement(\r\n element: HTMLElement,\r\n options: SnapElementOptions = {}\r\n ): () => void {\r\n const id = uid()\r\n\r\n this.elements.set(id, new SnapElement(element, options))\r\n\r\n return () => this.elements.delete(id)\r\n }\r\n\r\n addElements(\r\n elements: HTMLElement[],\r\n options: SnapElementOptions = {}\r\n ): () => void {\r\n const map = elements.map((element) => this.addElement(element, options))\r\n return () => {\r\n map.forEach((remove) => {\r\n remove()\r\n })\r\n }\r\n }\r\n\r\n private onWindowResize = () => {\r\n this.viewport.width = window.innerWidth\r\n this.viewport.height = window.innerHeight\r\n }\r\n\r\n private computeSnaps = () => {\r\n const { isHorizontal } = this.lenis\r\n\r\n let snaps = [...this.snaps.values()] as SnapItem[]\r\n\r\n this.elements.forEach(({ rect, align }) => {\r\n let value: number | undefined\r\n\r\n align.forEach((align) => {\r\n if (align === 'start') {\r\n value = rect.top\r\n } else if (align === 'center') {\r\n value = isHorizontal\r\n ? rect.left + rect.width / 2 - this.viewport.width / 2\r\n : rect.top + rect.height / 2 - this.viewport.height / 2\r\n } else if (align === 'end') {\r\n value = isHorizontal\r\n ? rect.left + rect.width - this.viewport.width\r\n : rect.top + rect.height - this.viewport.height\r\n }\r\n\r\n if (typeof value === 'number') {\r\n snaps.push({ value: Math.ceil(value) })\r\n }\r\n })\r\n })\r\n\r\n snaps = snaps.sort((a, b) => Math.abs(a.value) - Math.abs(b.value))\r\n\r\n return snaps\r\n }\r\n\r\n previous() {\r\n this.goTo((this.currentSnapIndex ?? 0) - 1)\r\n }\r\n\r\n next() {\r\n this.goTo((this.currentSnapIndex ?? 0) + 1)\r\n }\r\n\r\n goTo(index: number) {\r\n const snaps = this.computeSnaps()\r\n\r\n if (snaps.length === 0) return\r\n\r\n this.currentSnapIndex = Math.max(0, Math.min(index, snaps.length - 1))\r\n\r\n const currentSnap = snaps[this.currentSnapIndex]\r\n if (currentSnap === undefined) return\r\n\r\n this.lenis.scrollTo(currentSnap.value, {\r\n duration: this.options.duration,\r\n easing: this.options.easing,\r\n lerp: this.options.lerp,\r\n lock: this.options.type === 'lock',\r\n userData: { initiator: 'snap' },\r\n onStart: () => {\r\n this.options.onSnapStart?.({\r\n index: this.currentSnapIndex,\r\n ...currentSnap,\r\n })\r\n },\r\n onComplete: () => {\r\n this.options.onSnapComplete?.({\r\n index: this.currentSnapIndex,\r\n ...currentSnap,\r\n })\r\n },\r\n })\r\n }\r\n\r\n get distanceThreshold() {\r\n let distanceThreshold = Infinity\r\n if (this.options.type === 'mandatory') return Infinity\r\n\r\n const { isHorizontal } = this.lenis\r\n\r\n const axis = isHorizontal ? 'width' : 'height'\r\n\r\n if (\r\n typeof this.options.distanceThreshold === 'string' &&\r\n this.options.distanceThreshold.endsWith('%')\r\n ) {\r\n distanceThreshold =\r\n (Number(this.options.distanceThreshold.replace('%', '')) / 100) *\r\n this.viewport[axis]\r\n } else if (typeof this.options.distanceThreshold === 'number') {\r\n distanceThreshold = this.options.distanceThreshold\r\n } else {\r\n distanceThreshold = this.viewport[axis]\r\n }\r\n\r\n return distanceThreshold\r\n }\r\n\r\n private onSnap = (e: VirtualScrollData) => {\r\n if (this.isStopped) return\r\n\r\n if (e.event.type === 'touchmove') return\r\n\r\n if (\r\n this.options.type === 'lock' &&\r\n this.lenis.userData?.initiator === 'snap'\r\n )\r\n return\r\n\r\n let { scroll, isHorizontal } = this.lenis\r\n const delta = isHorizontal ? e.deltaX : e.deltaY\r\n scroll = Math.ceil(this.lenis.scroll + delta)\r\n\r\n const snaps = this.computeSnaps()\r\n\r\n if (snaps.length === 0) return\r\n\r\n let snapIndex\r\n\r\n const prevSnapIndex = snaps.findLastIndex(({ value }) => value < scroll)\r\n const nextSnapIndex = snaps.findIndex(({ value }) => value > scroll)\r\n\r\n if (this.options.type === 'lock') {\r\n if (delta > 0) {\r\n snapIndex = nextSnapIndex\r\n } else if (delta < 0) {\r\n snapIndex = prevSnapIndex\r\n }\r\n } else {\r\n const prevSnap = snaps[prevSnapIndex]!\r\n const distanceToPrevSnap = prevSnap\r\n ? Math.abs(scroll - prevSnap.value)\r\n : Infinity\r\n\r\n const nextSnap = snaps[nextSnapIndex]!\r\n const distanceToNextSnap = nextSnap\r\n ? Math.abs(scroll - nextSnap.value)\r\n : Infinity\r\n snapIndex =\r\n distanceToPrevSnap < distanceToNextSnap ? prevSnapIndex : nextSnapIndex\r\n }\r\n\r\n if (snapIndex === undefined) return\r\n if (snapIndex === -1) return\r\n\r\n snapIndex = Math.max(0, Math.min(snapIndex, snaps.length - 1))\r\n\r\n const snap = snaps[snapIndex]!\r\n\r\n const distance = Math.abs(scroll - snap.value)\r\n\r\n if (distance <= this.distanceThreshold) {\r\n this.goTo(snapIndex)\r\n }\r\n }\r\n\r\n resize() {\r\n this.elements.forEach((element) => element.onWrapperResize())\r\n 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