49 lines
1.6 KiB
JavaScript
49 lines
1.6 KiB
JavaScript
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import { VirtualScroll } from '@web/base';
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export const createScrollManager = (container, state, onRenderedListChange) => {
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const vs = VirtualScroll();
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let scrollEl = null;
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const refresh = () => {
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if (!scrollEl) return;
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// Expand the virtual viewport to 1.6x height to create a buffer
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const virtualContainer = {
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clientHeight: scrollEl.clientHeight * 1.6,
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scrollTop: scrollEl.scrollTop
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};
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const res = vs.calc(virtualContainer, state.list);
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if (res) {
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Object.assign(state, {
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prevHeight: res.prevHeight,
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postHeight: res.postHeight,
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_listStartIndex: res.listStartIndex,
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_renderedList: res.renderedList
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});
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onRenderedListChange?.(res.renderedList.length);
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}
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};
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return {
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init: () => {
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scrollEl = container.querySelector('.dt-main');
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},
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reset: (list) => {
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state._listStartIndex = 0;
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state._renderedList = vs.reset(list, scrollEl || container) || [];
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setTimeout(() => {
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if (state.list === list) {
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vs.init(list, refresh);
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}
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});
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},
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updateRowHeight: (index, node) => {
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// Restore this call so VirtualScroll can learn the actual height
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// of the rows instead of using its 32px default. This fixes
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// layout shifts/jumps when scrolling past the first group.
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vs.update(index + (state._listStartIndex || 0), node);
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},
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refresh,
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onScroll: refresh
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};
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};
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