@enact/ui/Touchable/Flick.js

A collection of simplified unstyled cross-platform UI components for Enact

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.flickConfigPropType = exports.defaultFlickConfig = exports["default"] = exports.Flick = void 0;
var _util = require("@enact/core/util");
var _propTypes = _interopRequireDefault(require("prop-types"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { "default": e }; }
function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), !0).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
function _defineProperty(e, r, t) { return (r = _toPropertyKey(r)) in e ? Object.defineProperty(e, r, { value: t, enumerable: !0, configurable: !0, writable: !0 }) : e[r] = t, e; }
function _classCallCheck(a, n) { if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function"); }
function _defineProperties(e, r) { for (var t = 0; t < r.length; t++) { var o = r[t]; o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, _toPropertyKey(o.key), o); } }
function _createClass(e, r, t) { return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", { writable: !1 }), e; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == typeof i ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != typeof t || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != typeof i) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
var Flick = exports.Flick = /*#__PURE__*/function () {
  function Flick() {
    var _this = this;
    _classCallCheck(this, Flick);
    this.begin = function (config, _ref, coords) {
      var onFlick = _ref.onFlick;
      _this.flickConfig = _objectSpread({}, config);
      if (_this.flickConfig.maxDuration !== null) {
        _this.cancelJob.startAfter(_this.flickConfig.maxDuration);
      }
      _this.tracking = !!onFlick;
      _this.moves.length = 0;
      _this.onFlick = onFlick;
      _this.move(coords);
    };
    // This method will get the `onFlick` props.
    this.updateProps = function (_ref2) {
      var onFlick = _ref2.onFlick;
      // Check `tracking` gesture is not in progress. Check if gesture exists before updating the references to the `onFlick`
      if (!_this.tracking) return;

      // This will update the `onFlick` with the new value
      _this.onFlick = onFlick;
    };
    this.move = function (_ref3) {
      var x = _ref3.x,
        y = _ref3.y;
      if (!_this.tracking) return;
      var maxMoves = _this.flickConfig.maxMoves;
      _this.moves.push({
        x: x,
        y: y,
        t: window.performance.now()
      });

      // track specified # of points
      if (_this.moves.length > maxMoves) {
        _this.moves.shift();
      }
    };
    this.blur = function () {
      _this.end();
    };
    this.cancel = function () {
      _this.tracking = false;
    };
    this.cancelJob = new _util.Job(this.cancel);
    this.end = function () {
      if (!_this.tracking) return;
      var minVelocity = _this.flickConfig.minVelocity;
      _this.cancelJob.stop();
      var moves = _this.moves;
      if (moves.length > 1) {
        // note: important to use up time to reduce flick
        // velocity based on time between move and up.
        var last = moves[moves.length - 1];
        var t = window.performance.now();
        var x = 0,
          y = 0;

        // take the greatest of flick between each tracked move and last move
        for (var i = moves.length - 2, m; m = moves[i]; i--) {
          // this flick (this move - last move) / (this time - last time)
          var dt = t - m.t;
          var vx = (last.x - m.x) / dt;
          var vy = (last.y - m.y) / dt;

          // if either axis is a greater flick than previously recorded use this one
          if (Math.abs(vx) > Math.abs(x) || Math.abs(vy) > Math.abs(y)) {
            x = vx;
            y = vy;
          }
        }
        var v = Math.sqrt(x * x + y * y);
        if (v > minVelocity) {
          var vertical = Math.abs(y) > Math.abs(x);
          // generate the flick using the start event so it has those coordinates
          // this.sendFlick(ti.startEvent, x, y, v);
          _this.onFlick({
            type: 'onFlick',
            direction: vertical ? 'vertical' : 'horizontal',
            velocityX: x,
            velocityY: y,
            velocity: v
          });
        }
      }
      _this.tracking = false;
    };
    this.tracking = false;
    this.moves = [];
  }
  return _createClass(Flick, [{
    key: "isTracking",
    value: function isTracking() {
      return this.tracking;
    }
  }]);
}();
var defaultFlickConfig = exports.defaultFlickConfig = {
  maxDuration: 250,
  maxMoves: 5,
  minVelocity: 0.1
};
var flickConfigPropType = exports.flickConfigPropType = _propTypes["default"].shape({
  maxDuration: _propTypes["default"].number,
  maxMoves: _propTypes["default"].number,
  maxVelocity: _propTypes["default"].number
});
var _default = exports["default"] = Flick;