@mui/material
Version:
React components that implement Google's Material Design.
60 lines (59 loc) • 3.13 kB
JavaScript
;
var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = useScrollTrigger;
var _extends2 = _interopRequireDefault(require("@babel/runtime/helpers/extends"));
var _objectWithoutPropertiesLoose2 = _interopRequireDefault(require("@babel/runtime/helpers/objectWithoutPropertiesLoose"));
var React = _interopRequireWildcard(require("react"));
const _excluded = ["getTrigger", "target"];
function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function (nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
function defaultTrigger(store, options) {
const {
disableHysteresis = false,
threshold = 100,
target
} = options;
const previous = store.current;
if (target) {
// Get vertical scroll
store.current = target.pageYOffset !== undefined ? target.pageYOffset : target.scrollTop;
}
if (!disableHysteresis && previous !== undefined) {
if (store.current < previous) {
return false;
}
}
return store.current > threshold;
}
const defaultTarget = typeof window !== 'undefined' ? window : null;
function useScrollTrigger(options = {}) {
const {
getTrigger = defaultTrigger,
target = defaultTarget
} = options,
other = (0, _objectWithoutPropertiesLoose2.default)(options, _excluded);
const store = React.useRef();
const [trigger, setTrigger] = React.useState(() => getTrigger(store, other));
React.useEffect(() => {
const handleScroll = () => {
setTrigger(getTrigger(store, (0, _extends2.default)({
target
}, other)));
};
handleScroll(); // Re-evaluate trigger when dependencies change
target.addEventListener('scroll', handleScroll, {
passive: true
});
return () => {
target.removeEventListener('scroll', handleScroll, {
passive: true
});
};
// See Option 3. https://github.com/facebook/react/issues/14476#issuecomment-471199055
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [target, getTrigger, JSON.stringify(other)]);
return trigger;
}