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