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$onViewportStatus = _ref.onViewportStatusChange,
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29 | onViewportStatusChange = _ref$onViewportStatus === undefined ? function () {} : _ref$onViewportStatus,
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30 | _ref$defaultBottomIsV = _ref.defaultBottomIsVisible,
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31 | defaultBottomIsVisible = _ref$defaultBottomIsV === undefined ? true : _ref$defaultBottomIsV,
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32 | isLocked = _ref.isLocked,
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33 | children = _ref.children;
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34 |
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35 | var _useState = (0, _react.useState)(defaultBottomIsVisible),
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36 | _useState2 = (0, _slicedToArray3.default)(_useState, 2),
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37 | bottomIsVisible = _useState2[0],
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38 | setBottomIsVisibleTo = _useState2[1];
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39 |
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40 | var _useState3 = (0, _react.useState)(null),
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41 | _useState4 = (0, _slicedToArray3.default)(_useState3, 2),
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42 | containerElement = _useState4[0],
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43 | setContainerElementTo = _useState4[1];
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44 |
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45 | var usePrevious = function usePrevious(value) {
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46 | var ref = (0, _react.useRef)();
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47 | (0, _react.useEffect)(function () {
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48 | ref.current = value;
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49 | });
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50 | return ref.current;
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51 | };
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52 | var prevBottomIsVisible = usePrevious(bottomIsVisible);
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53 | (0, _react.useEffect)(function () {
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54 | if (prevBottomIsVisible !== bottomIsVisible) {
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55 | onViewportStatusChange({ bottomIsVisible: bottomIsVisible, prevBottomIsVisible: prevBottomIsVisible });
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56 | }
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57 | });
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58 | var handleScroll = function handleScroll() {
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59 | if (containerElement === null) {
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60 | setContainerElementTo(document.querySelector(containerSelector));
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61 | }
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62 | if (!isLocked && containerElement !== null) {
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63 | if (containerElement.getBoundingClientRect().bottom > 0) {
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64 | setBottomIsVisibleTo(true);
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65 | } else {
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66 | setBottomIsVisibleTo(false);
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67 | }
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68 | }
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69 | };
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70 |
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71 | (0, _react.useEffect)(function () {
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72 | if (typeof window !== "undefined") {
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73 |
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74 | window.addEventListener("scroll", handleScroll);
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75 | }
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76 | return function () {
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77 |
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78 |
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79 | window.removeEventListener("scroll", handleScroll);
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80 | };
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81 | });
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82 |
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83 | return {
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84 | bottomIsVisible: bottomIsVisible
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85 | };
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86 | };
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87 |
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88 | var ViewportScanner = function ViewportScanner(_ref2) {
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89 | var children = _ref2.children,
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90 | props = (0, _objectWithoutProperties3.default)(_ref2, ["children"]);
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91 | return children(useViewportScanner(props));
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92 | };
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93 |
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94 | exports.useViewportScanner = useViewportScanner;
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95 | exports.default = ViewportScanner; |
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