@helpwave/hightide/dist/components/user-action/ScrollPicker.mjs.map

helpwave's component and theming library

{"version":3,"sources":["../../../src/components/user-action/ScrollPicker.tsx","../../../src/util/noop.ts","../../../src/util/array.ts","../../../src/util/math.ts"],"sourcesContent":["import { useCallback, useEffect, useState } from 'react'\nimport clsx from 'clsx'\nimport { noop } from '../../util/noop'\nimport { getNeighbours, range } from '../../util/array'\nimport { clamp } from '../../util/math'\n\nexport type ScrollPickerProps<T> = {\n  options: T[],\n  mapping: (value: T) => string,\n  selected?: T,\n  onChange?: (value: T) => void,\n  disabled?: boolean,\n}\n\ntype AnimationData<T> = {\n  /** The index we scroll to */\n  targetIndex: number,\n  /** The index we are currently showing centered */\n  currentIndex: number,\n  items: T[],\n  /** From -0.5 to 0.5 */\n  transition: number,\n  velocity: number,\n  animationVelocity: number,\n  lastTimeStamp?: number,\n  lastScrollTimeStamp?: number,\n}\n\nconst up = 1\nconst down = -1\ntype Direction = 1 | -1\n\n/**\n * A component for picking an option by scrolling\n */\nexport const ScrollPicker = <T, >({\n                                    options,\n                                    mapping,\n                                    selected,\n                                    onChange = noop,\n                                    disabled = false,\n                                  }: ScrollPickerProps<T>) => {\n  let selectedIndex = 0\n  if (selected && options.indexOf(selected) !== -1) {\n    selectedIndex = options.indexOf(selected)\n  }\n  const [{\n    currentIndex,\n    transition,\n    items,\n    lastTimeStamp\n  }, setAnimation] = useState<AnimationData<T>>({\n    targetIndex: selectedIndex,\n    currentIndex: disabled ? selectedIndex : 0,\n    velocity: 0,\n    animationVelocity: Math.floor(options.length / 2),\n    transition: 0,\n    items: options,\n  })\n\n  const itemsShownCount = 5\n  const shownItems = getNeighbours(range(items.length), currentIndex).map(index => ({\n    name: mapping(items[index]!), index\n  }))\n\n  const itemHeight = 40\n  const distance = 8\n\n  const containerHeight = itemHeight * (itemsShownCount - 2) + distance * (itemsShownCount - 2 + 1)\n\n  const getDirection = useCallback((targetIndex: number, currentIndex: number, transition: number, length: number): Direction => {\n    if (targetIndex === currentIndex) {\n      return transition > 0 ? up : down\n    }\n    let distanceForward = targetIndex - currentIndex\n    if (distanceForward < 0) {\n      distanceForward += length\n    }\n    return distanceForward >= length / 2 ? down : up\n  }, [])\n\n  const animate = useCallback((timestamp: number, startTime: number | undefined) => {\n    setAnimation((prevState) => {\n      const {\n        targetIndex,\n        currentIndex,\n        transition,\n        animationVelocity,\n        velocity,\n        items,\n        lastScrollTimeStamp\n      } = prevState\n      if (disabled) {\n        return { ...prevState, currentIndex: targetIndex, velocity: 0, lastTimeStamp: timestamp }\n      }\n      if ((targetIndex === currentIndex && velocity === 0 && transition === 0) || !startTime) {\n        return { ...prevState, lastTimeStamp: timestamp }\n      }\n      const progress = (timestamp - startTime) / 1000 // to seconds\n      const direction = getDirection(targetIndex, currentIndex, transition, items.length)\n\n      let newVelocity = velocity\n      let usedVelocity\n      let newCurrentIndex = currentIndex\n      const isAutoScrolling = velocity === 0 && (!lastScrollTimeStamp || timestamp - lastScrollTimeStamp > 300)\n\n      const newLastScrollTimeStamp = velocity !== 0 ? timestamp : lastScrollTimeStamp\n\n      // manual scrolling\n      if (isAutoScrolling) {\n        usedVelocity = direction * animationVelocity\n      } else {\n        usedVelocity = velocity\n        newVelocity = velocity * 0.5 // drag loss\n        if (Math.abs(newVelocity) <= 0.05) {\n          newVelocity = 0\n        }\n      }\n\n      let newTransition = transition + usedVelocity * progress\n      const changeThreshold = 0.5\n\n      while (newTransition >= changeThreshold) {\n        if (newCurrentIndex === targetIndex && newTransition >= changeThreshold && isAutoScrolling) {\n          newTransition = 0\n          break\n        }\n        newCurrentIndex = (currentIndex + 1) % items.length\n        newTransition -= 1\n      }\n      if (newTransition >= changeThreshold) {\n        newTransition = 0\n      }\n      while (newTransition <= -changeThreshold) {\n        if (newCurrentIndex === targetIndex && newTransition <= -changeThreshold && isAutoScrolling) {\n          newTransition = 0\n          break\n        }\n        newCurrentIndex = currentIndex === 0 ? items.length - 1 : currentIndex - 1\n        newTransition += 1\n      }\n      let newTargetIndex = targetIndex\n      if (!isAutoScrolling) {\n        newTargetIndex = newCurrentIndex\n      }\n\n      if ((currentIndex !== newTargetIndex || newTargetIndex !== targetIndex) && newTargetIndex === newCurrentIndex) {\n        onChange(items[newCurrentIndex]!)\n      }\n      return {\n        targetIndex: newTargetIndex,\n        currentIndex: newCurrentIndex,\n        animationVelocity,\n        transition: newTransition,\n        velocity: newVelocity,\n        items,\n        lastTimeStamp: timestamp,\n        lastScrollTimeStamp: newLastScrollTimeStamp\n      }\n    })\n  }, [disabled, getDirection, onChange])\n\n  useEffect(() => {\n    // constant update\n    requestAnimationFrame((timestamp) => animate(timestamp, lastTimeStamp))\n  })\n\n  const opacity = (transition: number, index: number, itemsCount: number) => {\n    const max = 100\n    const min = 0\n    const distance = max - min\n\n    let opacityValue = min\n    const unitTransition = clamp((transition) / 0.5)\n    if (index === 1 || index === itemsCount - 2) {\n      if (index === 1 && transition > 0) {\n        opacityValue += Math.floor(unitTransition * distance)\n      }\n      if (index === itemsCount - 2 && transition < 0) {\n        opacityValue += Math.floor(unitTransition * distance)\n      }\n    } else {\n      opacityValue = max\n    }\n\n    // TODO this is not the right value for the bottom entry\n    return clamp(1 - (opacityValue / max))\n  }\n\n  return (\n    <div\n      className=\"relative overflow-hidden\"\n      style={{ height: containerHeight }}\n      onWheel={event => {\n        if (event.deltaY !== 0) {\n          // TODO slower increase\n          setAnimation(({ velocity, ...animationData }) =>\n            ({ ...animationData, velocity: velocity + event.deltaY }))\n        }\n      }}\n    >\n      <div className=\"absolute top-1/2 -translate-y-1/2 -translate-x-1/2 left-1/2\">\n        <div\n          className=\"absolute z-[1] top-1/2 -translate-y-1/2 -translate-x-1/2 left-1/2 w-full min-w-[40px] border border-divider/50 border-y-2 border-x-0 \"\n          style={{ height: `${itemHeight}px` }}\n        />\n 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=> !disabled && setAnimation(prevState => ({ ...prevState, targetIndex: index }))}\n            >\n              {name}\n            </div>\n          ))}\n        </div>\n      </div>\n    </div>\n  )\n}\n","export const noop = () => undefined\n","export const equalSizeGroups = <T>(array: T[], groupSize: number): T[][] => {\n  if (groupSize <= 0) {\n    console.warn(`group size should be greater than 0: groupSize = ${groupSize}`)\n    return [[...array]]\n  }\n\n  const groups = []\n  for (let i = 0; i < array.length; i += groupSize) {\n    groups.push(array.slice(i, Math.min(i + groupSize, array.length)))\n  }\n  return groups\n}\n\nexport type RangeOptions = {\n  /**  Whether the range can be defined empty via end < start without a warning */\n  allowEmptyRange: boolean,\n  stepSize: number,\n  exclusiveStart: boolean,\n  exclusiveEnd: boolean,\n}\n\nconst defaultRangeOptions: RangeOptions = {\n  allowEmptyRange: false,\n  stepSize: 1,\n  exclusiveStart: false,\n  exclusiveEnd: true,\n}\n\n/**\n * @param endOrRange The end value or a range [start, end], end is exclusive\n * @param options the options for defining the range\n */\nexport const range = (endOrRange: number | [number, number], options?: Partial<RangeOptions>): number[] => {\n  const { allowEmptyRange, stepSize, exclusiveStart, exclusiveEnd } = { ...defaultRangeOptions, ...options }\n  let start = 0\n  let end: number\n  if (typeof endOrRange === 'number') {\n    end = endOrRange\n  } else {\n    start = endOrRange[0]\n    end = endOrRange[1]\n  }\n  if (!exclusiveEnd) {\n    end -= 1\n  }\n  if (exclusiveStart) {\n    start += 1\n  }\n\n  if (end - 1 < start) {\n    if (!allowEmptyRange) {\n      console.warn(`range: end (${end}) < start (${start}) should be allowed explicitly, set options.allowEmptyRange to true`)\n    }\n    return []\n  }\n  return Array.from({ length: end - start }, (_, index) => index * stepSize + start)\n}\n\n/** Finds the closest match\n * @param list The list of all possible matches\n * @param firstCloser Return whether item1 is closer than item2\n */\nexport const closestMatch = <T>(list: T[], firstCloser: (item1: T, item2: T) => boolean) => {\n  return list.reduce((item1, item2) => {\n    return firstCloser(item1, item2) ? item1 : item2\n  })\n}\n\n/**\n * returns the item in middle of a list and its neighbours before and after\n * e.g. [1,2,3,4,5,6] for item = 1 would return [5,6,1,2,3]\n */\nexport const getNeighbours = <T>(list: T[], item: T, neighbourDistance: number = 2) => {\n  const index = list.indexOf(item)\n  const totalItems = neighbourDistance * 2 + 1\n  if (list.length < totalItems) {\n    console.warn('List is to short')\n    return list\n  }\n\n  if (index === -1) {\n    console.error('item not found in list')\n    return list.splice(0, totalItems)\n  }\n\n  let start = index - neighbourDistance\n  if (start < 0) {\n    start += list.length\n  }\n  const end = (index + neighbourDistance + 1) % list.length\n\n  const result: T[] = []\n  let ignoreOnce = list.length === totalItems\n  for (let i = start; i !== end || ignoreOnce; i = (i + 1) % list.length) {\n    result.push(list[i]!)\n    if (end === i && ignoreOnce) {\n      ignoreOnce = false\n    }\n  }\n  return result\n}\n\nexport const createLoopingListWithIndex = <T>(list: T[], startIndex: number = 0, length: number = 0, forwards: boolean = true) => {\n  if (length < 0) {\n    console.warn(`createLoopingList: length must be >= 0, given ${length}`)\n  } else if (length === 0) {\n    length = list.length\n  }\n\n  const returnList: [number, T][] = []\n\n  if (forwards) {\n    for (let i = startIndex; returnList.length < length; i = (i + 1) % list.length) {\n      returnList.push([i, list[i]!])\n    }\n  } else {\n    for (let i = startIndex; returnList.length < length; i = i === 0 ? i = list.length - 1 : i - 1) {\n      returnList.push([i, list[i]!])\n    }\n  }\n\n  return returnList\n}\n\nexport const createLoopingList = <T>(list: T[], startIndex: number = 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