74 lines
3.4 KiB
JavaScript
74 lines
3.4 KiB
JavaScript
var $2a8c0bb1629926c8$exports = require("./useEvent.main.js");
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var $78605a5d7424e31b$exports = require("./useLayoutEffect.main.js");
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var $4Zukt$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, "useLoadMore", () => $faa6ccd6fb62f877$export$7717c92ee915373e);
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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 $faa6ccd6fb62f877$export$7717c92ee915373e(props, ref) {
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let { isLoading: isLoading, onLoadMore: onLoadMore, scrollOffset: scrollOffset = 1, items: items } = props;
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// Handle scrolling, and call onLoadMore when nearing the bottom.
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let isLoadingRef = (0, $4Zukt$react.useRef)(isLoading);
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let prevProps = (0, $4Zukt$react.useRef)(props);
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let onScroll = (0, $4Zukt$react.useCallback)(()=>{
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if (ref.current && !isLoadingRef.current && onLoadMore) {
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let shouldLoadMore = ref.current.scrollHeight - ref.current.scrollTop - ref.current.clientHeight < ref.current.clientHeight * scrollOffset;
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if (shouldLoadMore) {
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isLoadingRef.current = true;
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onLoadMore();
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}
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}
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}, [
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onLoadMore,
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ref,
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scrollOffset
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]);
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let lastItems = (0, $4Zukt$react.useRef)(items);
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(0, $78605a5d7424e31b$exports.useLayoutEffect)(()=>{
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// Only update isLoadingRef if props object actually changed,
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// not if a local state change occurred.
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if (props !== prevProps.current) {
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isLoadingRef.current = isLoading;
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prevProps.current = props;
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}
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// TODO: Eventually this hook will move back into RAC during which we will accept the collection as a option to this hook.
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// We will only load more if the collection has changed after the last load to prevent multiple onLoadMore from being called
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// while the data from the last onLoadMore is being processed by RAC collection.
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let shouldLoadMore = (ref === null || ref === void 0 ? void 0 : ref.current) && !isLoadingRef.current && onLoadMore && (!items || items !== lastItems.current) && ref.current.clientHeight === ref.current.scrollHeight;
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if (shouldLoadMore) {
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isLoadingRef.current = true;
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onLoadMore === null || onLoadMore === void 0 ? void 0 : onLoadMore();
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}
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lastItems.current = items;
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}, [
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isLoading,
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onLoadMore,
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props,
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ref,
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items
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]);
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// TODO: maybe this should still just return scroll props?
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// Test against case where the ref isn't defined when this is called
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// Think this was a problem when trying to attach to the scrollable body of the table in OnLoadMoreTableBodyScroll
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(0, $2a8c0bb1629926c8$exports.useEvent)(ref, 'scroll', onScroll);
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}
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//# sourceMappingURL=useLoadMore.main.js.map
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