55 lines
2.2 KiB
JavaScript
55 lines
2.2 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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Object.defineProperty(exports, "useStaticVirtualizerMeasure", {
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enumerable: true,
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get: function() {
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return useStaticVirtualizerMeasure;
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}
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});
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const _interop_require_wildcard = require("@swc/helpers/_/_interop_require_wildcard");
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const _react = /*#__PURE__*/ _interop_require_wildcard._(require("react"));
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const _useResizeObserverRef = require("./useResizeObserverRef");
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const useStaticVirtualizerMeasure = (virtualizerProps)=>{
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const { defaultItemSize, direction = 'vertical' } = virtualizerProps;
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const [state, setState] = _react.useState({
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virtualizerLength: 0,
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bufferSize: 0,
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bufferItems: 0
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});
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const { virtualizerLength, bufferItems, bufferSize } = state;
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const resizeCallback = _react.useCallback((_entries, // eslint-disable-next-line no-restricted-globals
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_observer, scrollRef)=>{
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if (!(scrollRef === null || scrollRef === void 0 ? void 0 : scrollRef.current)) {
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return;
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}
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const containerSize = direction === 'vertical' ? scrollRef === null || scrollRef === void 0 ? void 0 : scrollRef.current.getBoundingClientRect().height : scrollRef === null || scrollRef === void 0 ? void 0 : scrollRef.current.getBoundingClientRect().width;
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/*
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* Number of items required to cover viewport.
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*/ const length = Math.ceil(containerSize / defaultItemSize + 1);
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/*
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* Number of items to append at each end, i.e. 'preload' each side before entering view.
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*/ const newBufferItems = Math.max(Math.floor(length / 4), 2);
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/*
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* This is how far we deviate into the bufferItems to detect a redraw.
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*/ const newBufferSize = Math.max(Math.floor(length / 8 * defaultItemSize), 1);
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const totalLength = length + newBufferItems * 2 + 1;
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setState({
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virtualizerLength: totalLength,
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bufferItems: newBufferItems,
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bufferSize: newBufferSize
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});
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}, [
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defaultItemSize,
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direction
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]);
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const scrollRef = (0, _useResizeObserverRef.useResizeObserverRef_unstable)(resizeCallback);
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return {
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virtualizerLength,
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bufferItems,
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bufferSize,
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scrollRef
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};
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};
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