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/* ldgallery - A static generator which turns a collection of tagged
-- pictures into a searchable web gallery.
--
-- Copyright (C) 2019-2022 Guillaume FOUET
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero 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 Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import { MaybeElementRef, unrefElement } from '@vueuse/core';
import { nextTick, watch } from 'vue';
import { useRoute } from 'vue-router';
type ScrollPosition = Record<string, number>;
export const useLdSaveScroll = (element: MaybeElementRef) => {
const scrollPositions: ScrollPosition = {};
const route = useRoute();
watch(() => decodeURIComponent(route.path), (newRoute, oldRoute) => {
const el = unrefElement(element);
if (!el) return;
scrollPositions[oldRoute] = el.scrollTop / el.scrollHeight;
nextTick(() => (el.scrollTop = scrollPositions[newRoute] * el.scrollHeight));
});
};
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