lisn.js/dist/cjs/utils/gesture-touch.cjs.map

Simply handle user gestures and actions. Includes widgets.

{"version":3,"file":"gesture-touch.cjs","names":["MC","_interopRequireWildcard","require","MH","_directions","_math","_xMap","e","t","WeakMap","r","n","__esModule","o","i","f","__proto__","default","has","get","set","hasOwnProperty","call","Object","defineProperty","getOwnPropertyDescriptor","getTouchGestureFragment","events","options","_options$dragHoldTime","_options$dragNumFinge","isIterableObject","moves","getTouchDiff","deltaThreshold","numMoves","lengthOf","holdTime","getHoldTime","canBeDrag","dragHoldTime","dragNumFingers","angleDiffThreshold","deltaX","havingMaxAbs","map","m","deltaY","deltaZ","filter","d","isSignificant","direction","S_NONE","intent","S_UNKNOWN","vectorA","vectorB","areAntiParallel","startDistance","distanceBetween","startX","startY","endDistance","endX","endY","S_IN","S_OUT","S_ZOOM","deltaSign","reverseScroll","isFirst","S_DRAG","S_SCROLL","thisDirection","getVectorDirection","S_AMBIGUOUS","lastTouchEvent","lastOf","isTouchEvent","touches","device","S_TOUCH","exports","groupedTouches","newXMap","event","type","S_TOUCHCANCEL","touch","sGet","identifier","push","touchList","values","nTouches","firstTouch","lastTouch","clientX","clientY","maxAbs","firstStart","findIndex","S_TOUCHSTART","firstMove","S_TOUCHMOVE","timeStamp"],"sources":["../../../src/ts/utils/gesture-touch.ts"],"sourcesContent":["/**\n * @module Utils\n */\n\nimport * as MC from \"@lisn/globals/minification-constants\";\nimport * as MH from \"@lisn/globals/minification-helpers\";\n\nimport { Direction, GestureIntent, Vector } from \"@lisn/globals/types\";\n\nimport { getVectorDirection } from \"@lisn/utils/directions\";\n\nimport {\n  maxAbs,\n  havingMaxAbs,\n  distanceBetween,\n  areAntiParallel,\n} from \"@lisn/utils/math\";\nimport { GestureFragment } from \"@lisn/utils/gesture\";\n\nimport { newXMap } from \"@lisn/modules/x-map\";\n\n/**\n * @category Gestures\n */\nexport type TouchDiff = {\n  startX: number;\n  startY: number;\n\n  endX: number;\n  endY: number;\n\n  deltaX: number;\n  deltaY: number;\n\n  isSignificant: boolean;\n};\n\n/**\n * Returns a {@link GestureFragment} for the given events. Only \"touchmove\" events\n * will be considered.\n *\n * If there are less than 2 such events in the given list of events, returns `false`.\n *\n * If the gesture is to be considered terminated, e.g. because there is\n * \"touchcancel\" in the list, returns `null`.\n *\n * Note that by default swipe actions follow the natural direction: swipe up\n * with scroll intent results in direction down and swipe down results in\n * direction up. Drag intent always follows the direction of the gesture.\n *\n * For zoom intents, which necessarily involves exactly two fingers `deltaZ`\n * is based on the relative change in distance between the fingers.\n *\n * @param [options.deltaThreshold]\n *                          A change of x or y coordinate less than this is\n *                          considered insignificant, for the purposes of\n *                          determining:\n *                          1) whether the inferred direction is in one of the\n *                             four cardinal ones, or otherwise ambiguous; and\n *                          2) whether more than two fingers have moved and\n *                             therefore whether the direction could be zoom or\n *                             not\n * @param [options.angleDiffThreshold] See {@link getVectorDirection}\n * @param [options.reverseScroll]\n *                          If set to `true`, will disable natural scroll\n *                          direction.\n * @param [options.dragHoldTime]\n *                          If the user presses and holds for at least the\n *                          given amount of milliseconds before moving the\n *                          finger(s), gestures other than pinch will be\n *                          treated as a drag instead of scroll as long as the\n *                          number of fingers touching the screen is\n *                          `options.dragNumFingers`. Default is 500ms.\n * @param [options.dragNumFingers]\n *                          The number of fingers that could be considered a\n *                          drag intent. Default is 1.\n *\n * @returns `false` if there are less than 2 \"touchmove\" events in the list,\n * `null` if the gesture is terminated, otherwise a {@link GestureFragment}.\n *\n * @category Gestures\n */\nexport const getTouchGestureFragment = (\n  events: Event[],\n  options?: {\n    deltaThreshold?: number;\n    angleDiffThreshold?: number;\n    reverseScroll?: boolean;\n    dragHoldTime?: number;\n    dragNumFingers?: number;\n  },\n): GestureFragment | null | false => {\n  if (!MH.isIterableObject(events)) {\n    events = [events];\n  }\n\n  let moves = getTouchDiff(events, options?.deltaThreshold);\n\n  if (!moves) {\n    return null; // terminated\n  }\n\n  let numMoves = MH.lengthOf(moves);\n\n  const holdTime = getHoldTime(events);\n  const canBeDrag =\n    holdTime >= (options?.dragHoldTime ?? 500) &&\n    numMoves === (options?.dragNumFingers ?? 1);\n  const angleDiffThreshold = options?.angleDiffThreshold;\n\n  let deltaX = havingMaxAbs(...moves.map((m) => m.deltaX));\n  let deltaY = havingMaxAbs(...moves.map((m) => m.deltaY));\n  let deltaZ = 1;\n\n  if (numMoves > 2) {\n    // Take only the significant ones\n    moves = MH.filter(moves, (d) => d.isSignificant);\n    numMoves = MH.lengthOf(moves);\n  }\n\n  let direction: Direction = MC.S_NONE;\n  let intent: GestureIntent = MC.S_UNKNOWN;\n  if (numMoves === 2) {\n    // Check if it's a zoom\n    const vectorA: Vector = [moves[0].deltaX, moves[0].deltaY];\n    const vectorB: Vector = [moves[1].deltaX, moves[1].deltaY];\n\n    // If either finger is approx stationary, or if they move in opposite directions,\n    // treat it as zoom.\n    if (\n      !havingMaxAbs(...vectorA) || // finger A still\n      !havingMaxAbs(...vectorB) || // finger B still\n      areAntiParallel(vectorA, vectorB, angleDiffThreshold)\n    ) {\n      // It's a pinch motion => zoom\n      const startDistance = distanceBetween(\n        [moves[0].startX, moves[0].startY],\n        [moves[1].startX, moves[1].startY],\n      );\n\n      const endDistance = distanceBetween(\n        [moves[0].endX, moves[0].endY],\n        [moves[1].endX, moves[1].endY],\n      );\n\n      direction = startDistance < endDistance ? MC.S_IN : MC.S_OUT;\n      deltaZ = endDistance / startDistance;\n      deltaX = deltaY = 0;\n      intent = MC.S_ZOOM;\n    }\n  }\n\n  const deltaSign = canBeDrag || options?.reverseScroll ? 1 : -1;\n  // If scrolling, swap the deltas for natural scroll direction.\n  // Add +0 to force -0 to be +0 since jest doesn't think they're equal\n  deltaX = deltaSign * deltaX + 0;\n  deltaY = deltaSign * deltaY + 0;\n\n  if (direction === MC.S_NONE) {\n    // Wasn't a zoom. Check if all moves are aligned.\n    let isFirst = true;\n\n    for (const m of moves) {\n      // There's at least one significant move, assume scroll or drag intent.\n      intent = canBeDrag ? MC.S_DRAG : MC.S_SCROLL;\n\n      const thisDirection = getVectorDirection(\n        [deltaSign * m.deltaX, deltaSign * m.deltaY],\n        angleDiffThreshold,\n      );\n\n      if (thisDirection === MC.S_NONE) {\n        continue;\n      }\n\n      if (isFirst) {\n        direction = thisDirection;\n      } else if (direction !== thisDirection) {\n        direction = MC.S_AMBIGUOUS;\n        break;\n      }\n\n      isFirst = false;\n    }\n  }\n\n  if (direction === MC.S_NONE) {\n    const lastTouchEvent = MH.lastOf(events.filter(MH.isTouchEvent));\n    // If all fingers have lifted off, consider it terminated, otherwise wait\n    // for more events.\n    return MH.lengthOf(lastTouchEvent?.touches) ? false : null;\n  }\n\n  return {\n    device: MC.S_TOUCH,\n    direction,\n    intent,\n    deltaX,\n    deltaY,\n    deltaZ,\n  };\n};\n\n/**\n * Returns a description of the changes in each finger between the first and\n * the last relevant TouchEvent in the list.\n *\n * If the gesture is to be considered terminated, e.g. because there is\n * \"touchcancel\" in the list, returns `null`.\n *\n * Note that, `deltaX`/`deltaY` are the end X/Y coordinate minus the start X/Y\n * coordinate. For natural scroll direction you should swap their signs.\n *\n * @param deltaThreshold If the change of x and y coordinate are both less\n *                       than this, it is marked as not significant.\n *\n * @category Gestures\n */\nexport const getTouchDiff = (\n  events: Event[],\n  deltaThreshold = 0,\n): TouchDiff[] | null => {\n  // Group each touch point of each event by identifier, so that we can get the\n  // start and end coordinate of each finger\n  const groupedTouches = newXMap<number, Touch[]>((): Touch[] => []);\n\n  for (const event of events) {\n    if (!MH.isTouchEvent(event)) {\n      continue;\n    }\n\n    if (event.type === MC.S_TOUCHCANCEL) {\n      return null; // gesture terminated\n    }\n\n    for (const touch of event.touches) {\n      groupedTouches.sGet(touch.identifier).push(touch);\n    }\n  }\n\n  const moves: TouchDiff[] = [];\n\n  for (const touchList of groupedTouches.values()) {\n    const nTouches = MH.lengthOf(touchList);\n    if (nTouches < 2) {\n      // Only one event had that finger in it, so there's no move for it\n      continue;\n    }\n\n    const firstTouch = touchList[0];\n    const lastTouch = touchList[nTouches - 1];\n    const startX = firstTouch.clientX;\n    const startY = firstTouch.clientY;\n\n    const endX = lastTouch.clientX;\n    const endY = lastTouch.clientY;\n\n    const deltaX = endX - startX;\n    const deltaY = endY - startY;\n\n    const isSignificant = maxAbs(deltaX, deltaY) >= deltaThreshold;\n\n    // Consider it a move in one of the 4 cardinal ones\n    moves.push({\n      startX,\n      startY,\n      endX,\n      endY,\n      deltaX,\n      deltaY,\n      isSignificant,\n    });\n  }\n\n  return moves;\n};\n\n// --------------------\n\nconst getHoldTime = (events: Event[]) => {\n  const firstStart = events.findIndex((e) => e.type === MC.S_TOUCHSTART);\n  const firstMove = events.findIndex((e) => e.type === MC.S_TOUCHMOVE);\n  if (firstStart < 0 || firstMove < 1) {\n    return 0;\n  }\n\n  return events[firstMove].timeStamp - 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