1 | 'use strict';
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.useViewportScanner = undefined;
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7 |
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8 | var _objectWithoutProperties2 = require('babel-runtime/helpers/objectWithoutProperties');
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9 |
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10 | var _objectWithoutProperties3 = _interopRequireDefault(_objectWithoutProperties2);
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11 |
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12 | var _slicedToArray2 = require('babel-runtime/helpers/slicedToArray');
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13 |
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14 | var _slicedToArray3 = _interopRequireDefault(_slicedToArray2);
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15 |
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16 | var _react = require('react');
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17 |
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18 | var _react2 = _interopRequireDefault(_react);
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19 |
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20 | var _propTypes = require('prop-types');
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21 |
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22 | var _propTypes2 = _interopRequireDefault(_propTypes);
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23 |
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24 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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25 |
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26 | var useViewportScanner = function useViewportScanner(_ref) {
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27 | var containerSelector = _ref.containerSelector,
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28 | _ref$defaultBottomIsV = _ref.defaultBottomIsVisible,
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29 | defaultBottomIsVisible = _ref$defaultBottomIsV === undefined ? true : _ref$defaultBottomIsV,
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30 | isLocked = _ref.isLocked,
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31 | children = _ref.children;
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32 |
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33 | var _useState = (0, _react.useState)(defaultBottomIsVisible),
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34 | _useState2 = (0, _slicedToArray3.default)(_useState, 2),
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35 | bottomIsVisible = _useState2[0],
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36 | setBottomIsVisibleTo = _useState2[1];
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37 |
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38 | var _useState3 = (0, _react.useState)(null),
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39 | _useState4 = (0, _slicedToArray3.default)(_useState3, 2),
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40 | containerElement = _useState4[0],
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41 | setContainerElementTo = _useState4[1];
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42 |
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43 | var handleScroll = function handleScroll() {
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44 | if (containerElement === null) {
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45 | setContainerElementTo(document.querySelector(containerSelector));
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46 | }
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47 | if (!isLocked && containerElement !== null) {
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48 | if (containerElement.getBoundingClientRect().bottom > 0) {
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49 | setBottomIsVisibleTo(true);
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50 | } else {
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51 | setBottomIsVisibleTo(false);
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52 | }
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53 | }
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54 | };
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55 |
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56 | (0, _react.useEffect)(function () {
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57 | if (typeof window !== 'undefined') {
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58 |
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59 | window.addEventListener('scroll', handleScroll);
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60 | }
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61 | return function () {
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62 |
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63 |
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64 | window.removeEventListener('scroll', handleScroll);
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65 | };
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66 | });
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67 |
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68 | return {
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69 | bottomIsVisible: bottomIsVisible
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70 | };
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71 | };
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72 |
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73 | var ViewportScanner = function ViewportScanner(_ref2) {
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74 | var children = _ref2.children,
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75 | props = (0, _objectWithoutProperties3.default)(_ref2, ['children']);
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76 | return children(useViewportScanner(props));
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77 | };
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78 |
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79 | exports.useViewportScanner = useViewportScanner;
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80 | exports.default = ViewportScanner; |
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