| 1 | import { Current } from '@tarojs/runtime';
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| 2 |
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| 3 | const pageScrollFn = {};
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| 4 | let pageDOM = window;
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| 5 | function bindPageScroll(page, scrollEl, distance = 50) {
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| 6 | var _a;
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| 7 | const pagePath = (page ? page === null || page === void 0 ? void 0 : page.path : (_a = Current.router) === null || _a === void 0 ? void 0 : _a.path);
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| 8 | pageScrollFn[pagePath] && scrollEl.removeEventListener('scroll', pageScrollFn[pagePath]);
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| 9 | pageDOM = scrollEl;
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| 10 | let isReachBottom = false;
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| 11 | pageScrollFn[pagePath] = function () {
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| 12 | var _a;
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| 13 | (_a = page.onPageScroll) === null || _a === void 0 ? void 0 : _a.call(page, {
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| 14 | scrollTop: pageDOM instanceof Window ? window.scrollY : pageDOM.scrollTop
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| 15 | });
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| 16 | if (isReachBottom && getOffset() > distance) {
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| 17 | isReachBottom = false;
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| 18 | }
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| 19 | if (page.onReachBottom &&
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| 20 | !isReachBottom &&
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| 21 | getOffset() < distance) {
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| 22 | isReachBottom = true;
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| 23 | page.onReachBottom();
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| 24 | }
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| 25 | };
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| 26 | pageDOM.addEventListener('scroll', pageScrollFn[pagePath], false);
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| 27 | }
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| 28 | function getOffset() {
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| 29 | if (pageDOM instanceof Window) {
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| 30 | return document.documentElement.scrollHeight - window.scrollY - window.innerHeight;
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| 31 | }
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| 32 | else {
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| 33 | return pageDOM.scrollHeight - pageDOM.scrollTop - pageDOM.clientHeight;
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| 34 | }
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| 35 | }
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| 36 |
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| 37 | export { bindPageScroll };
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