lenis/dist/lenis-snap.mjs.map

How smooth scroll should be

{"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<CB extends (...args: any[]) => void>(\r\n  callback: CB,\r\n  delay: number\r\n) {\r\n  let timer: number | undefined\r\n  return function <T>(this: T, ...args: Parameters<typeof callback>) {\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","function 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\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.ignoreSticky = ignoreSticky\r\n    // this.ignoreTransform = ignoreTransform\r\n\r\n    this.align = [align].flat()\r\n\r\n    // TODO: assing rect immediately\r\n\r\n    this.wrapperResizeObserver = new ResizeObserver(this.onWrapperResize)\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 { UserData } 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// - horizontal\r\n// - fix trackpad snapping too soon due to velocity (fuck Apple)\r\n// - fix wheel scrolling after limits (see console scroll to)\r\n// - fix touch scroll, do not snap when not released\r\n// - arrow, spacebar\r\n\r\ntype RequiredPick<T, F extends keyof T> = Omit<T, F> & Required<Pick<T, F>>\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'\r\n *   lerp: 0.1,\r\n *   duration: 1,\r\n *   easing: (t) => t,\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    SnapOptions,\r\n    | 'type'\r\n    // | 'velocityThreshold'\r\n    | 'debounce'\r\n  >\r\n  elements = new Map<UID, SnapElement>()\r\n  snaps = new Map<UID, SnapItem>()\r\n  viewport = {\r\n    width: window.innerWidth,\r\n    height: window.innerHeight,\r\n  }\r\n  isStopped = false\r\n  onSnapDebounced: () => void\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%',\r\n      // velocityThreshold = 1.2,\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      // velocityThreshold,\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('scroll', this.onScroll)\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('scroll', this.onScroll)\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, userData: UserData = {}) {\r\n    const id = uid()\r\n\r\n    this.snaps.set(id, { value, userData })\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(element: HTMLElement, options: SnapElementOptions = {}) {\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  private onWindowResize = () => {\r\n    this.viewport.width = window.innerWidth\r\n    this.viewport.height = window.innerHeight\r\n  }\r\n\r\n  // private onScroll = ({\r\n  //   // scroll,\r\n  //   // limit,\r\n  //   lastVelocity,\r\n  //   velocity,\r\n  //   // isScrolling,\r\n  //   userData,\r\n  // }: // isHorizontal,\r\n  // Lenis) => {\r\n  //   if (this.isStopped) return\r\n\r\n  //   // return\r\n  //   const isDecelerating = Math.abs(lastVelocity) > Math.abs(velocity)\r\n  //   const isTurningBack =\r\n  //     Math.sign(lastVelocity) !== Math.sign(velocity) && velocity !== 0\r\n\r\n  //   if (\r\n  //     Math.abs(velocity) < this.options.velocityThreshold &&\r\n  //     // !isTouching &&\r\n  //     isDecelerating &&\r\n  //     !isTurningBack &&\r\n  //     userData?.initiator !== 'snap'\r\n  //   ) {\r\n  //     this.onSnapDebounced()\r\n  //   }\r\n  // }\r\n\r\n  private onSnap = () => {\r\n    let { scroll, isHorizontal } = this.lenis\r\n    scroll = Math.ceil(this.lenis.scroll)\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), userData: {} })\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    if (snaps.length === 0) return\r\n\r\n    let prevSnap = snaps.findLast(({ value }) => value <= scroll)\r\n    if (prevSnap === undefined) prevSnap = snaps[0]!\r\n    const distanceToPrevSnap = Math.abs(scroll - prevSnap.value)\r\n\r\n    let nextSnap = snaps.find(({ value }) => value >= scroll)\r\n    if (nextSnap === undefined) nextSnap = snaps[snaps.length - 1]!\r\n    const distanceToNextSnap = Math.abs(scroll - nextSnap.value)\r\n\r\n    const snap = distanceToPrevSnap < distanceToNextSnap ? prevSnap : nextSnap\r\n\r\n    const distance = Math.abs(scroll - snap.value)\r\n\r\n    let distanceThreshold\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    if (\r\n      this.options.type === 'mandatory' ||\r\n      (this.options.type === 'proximity' && distance <= distanceThreshold)\r\n    ) {\r\n      // this.__isScrolling = true\r\n      // this.onSnapStart?.(snap)\r\n\r\n      // console.log('scroll to')\r\n\r\n      this.lenis.scrollTo(snap.value, {\r\n        lerp: this.options.lerp,\r\n        easing: this.options.easing,\r\n        duration: this.options.duration,\r\n        userData: { initiator: 'snap' },\r\n        onStart: () => {\r\n          this.options.onSnapStart?.(snap)\r\n        },\r\n        onComplete: () => {\r\n          this.options.onSnapComplete?.(snap)\r\n        },\r\n      })\r\n    }\r\n\r\n    // console.timeEnd('scroll')\r\n  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