@neo4j-ndl/react
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React implementation of Neo4j Design System
66 lines • 2.63 kB
JavaScript
;
/**
*
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.useEllipsisObserver = useEllipsisObserver;
const react_1 = require("react");
const debounce_1 = require("../helpers/debounce");
function useEllipsisObserver(options = {}) {
const { lineClamp = 1, debounceMs = 100 } = options;
const ref = (0, react_1.useRef)(null);
const [isEllipsized, setIsEllipsized] = (0, react_1.useState)(false);
(0, react_1.useEffect)(() => {
const el = ref.current;
if (!el) {
return;
}
const checkEllipsis = () => {
let hasEllipsis = false;
if (lineClamp > 1) {
// For multi-line ellipsis (line-clamp)
// Check if scrollHeight is greater than clientHeight
hasEllipsis = el.scrollHeight > el.clientHeight;
}
else {
// For single-line ellipsis (text-overflow: ellipsis)
// Check if scrollWidth is greater than clientWidth
hasEllipsis = el.scrollWidth > el.clientWidth;
}
setIsEllipsized(hasEllipsis);
};
const debouncedCheck = (0, debounce_1.debounce)(checkEllipsis, debounceMs);
// Initial check
checkEllipsis();
const resizeObserver = new ResizeObserver(debouncedCheck);
resizeObserver.observe(el);
// Also observe the parent element to catch container size changes
if (el.parentElement) {
resizeObserver.observe(el.parentElement);
}
window.addEventListener('resize', debouncedCheck);
return () => {
resizeObserver.disconnect();
window.removeEventListener('resize', debouncedCheck);
};
}, [lineClamp, debounceMs]);
return [ref, isEllipsized];
}
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