60 lines
3.1 KiB
JavaScript
60 lines
3.1 KiB
JavaScript
var $d796e7157ac96470$exports = require("./getScrollParent.main.js");
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var $1254e5bb94ac8761$exports = require("./useEffectEvent.main.js");
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var $78605a5d7424e31b$exports = require("./useLayoutEffect.main.js");
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var $8Ncyo$react = require("react");
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function $parcel$export(e, n, v, s) {
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Object.defineProperty(e, n, {get: v, set: s, enumerable: true, configurable: true});
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}
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$parcel$export(module.exports, "useLoadMoreSentinel", () => $f6a4874a7c582761$export$ccaea96c28e8b9e7);
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/*
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* Copyright 2024 Adobe. All rights reserved.
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* This file is licensed to you under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under
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* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
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* OF ANY KIND, either express or implied. See the License for the specific language
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* governing permissions and limitations under the License.
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*/
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function $f6a4874a7c582761$export$ccaea96c28e8b9e7(props, ref) {
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let { collection: collection, onLoadMore: onLoadMore, scrollOffset: scrollOffset = 1 } = props;
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let sentinelObserver = (0, $8Ncyo$react.useRef)(null);
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let triggerLoadMore = (0, $1254e5bb94ac8761$exports.useEffectEvent)((entries)=>{
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// Use "isIntersecting" over an equality check of 0 since it seems like there is cases where
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// a intersection ratio of 0 can be reported when isIntersecting is actually true
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for (let entry of entries)// Note that this will be called if the collection changes, even if onLoadMore was already called and is being processed.
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// Up to user discretion as to how to handle these multiple onLoadMore calls
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if (entry.isIntersecting && onLoadMore) onLoadMore();
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});
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(0, $78605a5d7424e31b$exports.useLayoutEffect)(()=>{
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if (ref.current) {
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// Tear down and set up a new IntersectionObserver when the collection changes so that we can properly trigger additional loadMores if there is room for more items
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// Need to do this tear down and set up since using a large rootMargin will mean the observer's callback isn't called even when scrolling the item into view beause its visibility hasn't actually changed
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// https://codesandbox.io/p/sandbox/magical-swanson-dhgp89?file=%2Fsrc%2FApp.js%3A21%2C21
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sentinelObserver.current = new IntersectionObserver(triggerLoadMore, {
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root: (0, $d796e7157ac96470$exports.getScrollParent)(ref === null || ref === void 0 ? void 0 : ref.current),
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rootMargin: `0px ${100 * scrollOffset}% ${100 * scrollOffset}% ${100 * scrollOffset}%`
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});
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sentinelObserver.current.observe(ref.current);
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}
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return ()=>{
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if (sentinelObserver.current) sentinelObserver.current.disconnect();
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};
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}, [
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collection,
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triggerLoadMore,
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ref,
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scrollOffset
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]);
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}
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//# sourceMappingURL=useLoadMoreSentinel.main.js.map
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