1 | "use strict";
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2 |
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3 | var _interopRequireWildcard = require("@babel/runtime/helpers/interopRequireWildcard");
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4 |
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5 | var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
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6 |
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7 | Object.defineProperty(exports, "__esModule", {
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8 | value: true
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9 | });
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10 | exports.default = useScrollTrigger;
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11 |
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12 | var _extends2 = _interopRequireDefault(require("@babel/runtime/helpers/extends"));
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13 |
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14 | var _objectWithoutProperties2 = _interopRequireDefault(require("@babel/runtime/helpers/objectWithoutProperties"));
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15 |
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16 | var React = _interopRequireWildcard(require("react"));
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17 |
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18 | function defaultTrigger(store, options) {
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19 | var _options$disableHyste = options.disableHysteresis,
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20 | disableHysteresis = _options$disableHyste === void 0 ? false : _options$disableHyste,
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21 | _options$threshold = options.threshold,
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22 | threshold = _options$threshold === void 0 ? 100 : _options$threshold,
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23 | target = options.target;
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24 | var previous = store.current;
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25 |
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26 | if (target) {
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27 |
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28 | store.current = target.pageYOffset !== undefined ? target.pageYOffset : target.scrollTop;
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29 | }
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30 |
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31 | if (!disableHysteresis && previous !== undefined) {
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32 | if (store.current < previous) {
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33 | return false;
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34 | }
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35 | }
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36 |
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37 | return store.current > threshold;
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38 | }
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39 |
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40 | var defaultTarget = typeof window !== 'undefined' ? window : null;
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41 |
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42 | function useScrollTrigger() {
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43 | var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
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44 | var _options$getTrigger = options.getTrigger,
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45 | getTrigger = _options$getTrigger === void 0 ? defaultTrigger : _options$getTrigger,
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46 | _options$target = options.target,
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47 | target = _options$target === void 0 ? defaultTarget : _options$target,
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48 | other = (0, _objectWithoutProperties2.default)(options, ["getTrigger", "target"]);
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49 | var store = React.useRef();
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50 |
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51 | var _React$useState = React.useState(function () {
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52 | return getTrigger(store, other);
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53 | }),
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54 | trigger = _React$useState[0],
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55 | setTrigger = _React$useState[1];
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56 |
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57 | React.useEffect(function () {
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58 | var handleScroll = function handleScroll() {
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59 | setTrigger(getTrigger(store, (0, _extends2.default)({
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60 | target: target
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61 | }, other)));
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62 | };
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63 |
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64 | handleScroll();
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65 |
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66 | target.addEventListener('scroll', handleScroll);
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67 | return function () {
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68 | target.removeEventListener('scroll', handleScroll);
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69 | };
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70 |
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71 | }, [target, getTrigger, JSON.stringify(other)]);
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72 | return trigger;
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73 | } |
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