43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
import { isFunction } from '../common/validator';
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import { getCurrentPage, isDef } from '../common/utils';
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function onPageScroll(event) {
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const { vanPageScroller = [] } = getCurrentPage();
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vanPageScroller.forEach((scroller) => {
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if (typeof scroller === 'function') {
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// @ts-ignore
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scroller(event);
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}
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});
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}
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export function pageScrollMixin(scroller) {
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return Behavior({
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attached() {
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const page = getCurrentPage();
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if (!isDef(page)) {
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return;
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}
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const _scroller = scroller.bind(this);
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const { vanPageScroller = [] } = page;
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if (isFunction(page.onPageScroll) && page.onPageScroll !== onPageScroll) {
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vanPageScroller.push(page.onPageScroll.bind(page));
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}
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vanPageScroller.push(_scroller);
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page.vanPageScroller = vanPageScroller;
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page.onPageScroll = onPageScroll;
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this._scroller = _scroller;
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},
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detached() {
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const page = getCurrentPage();
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if (!isDef(page) || !isDef(page.vanPageScroller)) {
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return;
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}
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const { vanPageScroller } = page;
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const index = vanPageScroller.findIndex((v) => v === this._scroller);
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if (index > -1) {
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page.vanPageScroller.splice(index, 1);
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}
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this._scroller = undefined;
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},
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});
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}
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