750 lines
24 KiB
Plaintext
750 lines
24 KiB
Plaintext
import { debounce, memo, notUndefined, approxEqual } from "./utils.js";
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const defaultKeyExtractor = (index) => index;
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const defaultRangeExtractor = (range) => {
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const start = Math.max(range.startIndex - range.overscan, 0);
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const end = Math.min(range.endIndex + range.overscan, range.count - 1);
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const arr = [];
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for (let i = start; i <= end; i++) {
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arr.push(i);
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}
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return arr;
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};
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const observeElementRect = (instance, cb) => {
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const element = instance.scrollElement;
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if (!element) {
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return;
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}
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const targetWindow = instance.targetWindow;
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if (!targetWindow) {
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return;
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}
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const handler = (rect) => {
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const { width, height } = rect;
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cb({ width: Math.round(width), height: Math.round(height) });
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};
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handler(element.getBoundingClientRect());
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if (!targetWindow.ResizeObserver) {
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return () => {
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};
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}
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const observer = new targetWindow.ResizeObserver((entries) => {
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const entry = entries[0];
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if (entry == null ? void 0 : entry.borderBoxSize) {
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const box = entry.borderBoxSize[0];
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if (box) {
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handler({ width: box.inlineSize, height: box.blockSize });
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return;
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}
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}
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handler(element.getBoundingClientRect());
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});
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observer.observe(element, { box: "border-box" });
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return () => {
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observer.unobserve(element);
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};
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};
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const addEventListenerOptions = {
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passive: true
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};
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const observeWindowRect = (instance, cb) => {
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const element = instance.scrollElement;
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if (!element) {
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return;
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}
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const handler = () => {
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cb({ width: element.innerWidth, height: element.innerHeight });
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};
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handler();
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element.addEventListener("resize", handler, addEventListenerOptions);
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return () => {
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element.removeEventListener("resize", handler);
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};
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};
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const supportsScrollend = typeof window == "undefined" ? true : "onscrollend" in window;
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const observeElementOffset = (instance, cb) => {
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const element = instance.scrollElement;
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if (!element) {
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return;
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}
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const targetWindow = instance.targetWindow;
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if (!targetWindow) {
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return;
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}
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let offset = 0;
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const fallback = instance.options.useScrollendEvent && supportsScrollend ? () => void 0 : debounce(
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targetWindow,
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() => {
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cb(offset, false);
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},
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instance.options.isScrollingResetDelay
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);
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const createHandler = (isScrolling) => () => {
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const { horizontal, isRtl } = instance.options;
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offset = horizontal ? element["scrollLeft"] * (isRtl && -1 || 1) : element["scrollTop"];
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fallback();
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cb(offset, isScrolling);
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};
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const handler = createHandler(true);
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const endHandler = createHandler(false);
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endHandler();
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element.addEventListener("scroll", handler, addEventListenerOptions);
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element.addEventListener("scrollend", endHandler, addEventListenerOptions);
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return () => {
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element.removeEventListener("scroll", handler);
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element.removeEventListener("scrollend", endHandler);
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};
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};
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const observeWindowOffset = (instance, cb) => {
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const element = instance.scrollElement;
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if (!element) {
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return;
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}
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const targetWindow = instance.targetWindow;
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if (!targetWindow) {
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return;
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}
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let offset = 0;
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const fallback = instance.options.useScrollendEvent && supportsScrollend ? () => void 0 : debounce(
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targetWindow,
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() => {
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cb(offset, false);
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},
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instance.options.isScrollingResetDelay
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);
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const createHandler = (isScrolling) => () => {
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offset = element[instance.options.horizontal ? "scrollX" : "scrollY"];
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fallback();
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cb(offset, isScrolling);
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};
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const handler = createHandler(true);
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const endHandler = createHandler(false);
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endHandler();
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element.addEventListener("scroll", handler, addEventListenerOptions);
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element.addEventListener("scrollend", endHandler, addEventListenerOptions);
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return () => {
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element.removeEventListener("scroll", handler);
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element.removeEventListener("scrollend", endHandler);
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};
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};
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const measureElement = (element, entry, instance) => {
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if (entry == null ? void 0 : entry.borderBoxSize) {
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const box = entry.borderBoxSize[0];
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if (box) {
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const size = Math.round(
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box[instance.options.horizontal ? "inlineSize" : "blockSize"]
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);
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return size;
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}
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}
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return Math.round(
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element.getBoundingClientRect()[instance.options.horizontal ? "width" : "height"]
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);
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};
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const windowScroll = (offset, {
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adjustments = 0,
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behavior
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}, instance) => {
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var _a, _b;
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const toOffset = offset + adjustments;
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(_b = (_a = instance.scrollElement) == null ? void 0 : _a.scrollTo) == null ? void 0 : _b.call(_a, {
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[instance.options.horizontal ? "left" : "top"]: toOffset,
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behavior
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});
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};
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const elementScroll = (offset, {
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adjustments = 0,
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behavior
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}, instance) => {
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var _a, _b;
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const toOffset = offset + adjustments;
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(_b = (_a = instance.scrollElement) == null ? void 0 : _a.scrollTo) == null ? void 0 : _b.call(_a, {
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[instance.options.horizontal ? "left" : "top"]: toOffset,
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behavior
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});
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};
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class Virtualizer {
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constructor(opts) {
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this.unsubs = [];
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this.scrollElement = null;
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this.targetWindow = null;
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this.isScrolling = false;
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this.scrollToIndexTimeoutId = null;
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this.measurementsCache = [];
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this.itemSizeCache = /* @__PURE__ */ new Map();
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this.pendingMeasuredCacheIndexes = [];
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this.scrollRect = null;
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this.scrollOffset = null;
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this.scrollDirection = null;
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this.scrollAdjustments = 0;
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this.elementsCache = /* @__PURE__ */ new Map();
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this.observer = /* @__PURE__ */ (() => {
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let _ro = null;
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const get = () => {
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if (_ro) {
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return _ro;
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}
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if (!this.targetWindow || !this.targetWindow.ResizeObserver) {
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return null;
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}
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return _ro = new this.targetWindow.ResizeObserver((entries) => {
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entries.forEach((entry) => {
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this._measureElement(entry.target, entry);
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});
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});
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};
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return {
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disconnect: () => {
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var _a;
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(_a = get()) == null ? void 0 : _a.disconnect();
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_ro = null;
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},
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observe: (target) => {
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var _a;
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return (_a = get()) == null ? void 0 : _a.observe(target, { box: "border-box" });
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},
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unobserve: (target) => {
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var _a;
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return (_a = get()) == null ? void 0 : _a.unobserve(target);
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}
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};
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})();
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this.range = null;
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this.setOptions = (opts2) => {
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Object.entries(opts2).forEach(([key, value]) => {
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if (typeof value === "undefined") delete opts2[key];
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});
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this.options = {
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debug: false,
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initialOffset: 0,
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overscan: 1,
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paddingStart: 0,
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paddingEnd: 0,
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scrollPaddingStart: 0,
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scrollPaddingEnd: 0,
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horizontal: false,
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getItemKey: defaultKeyExtractor,
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rangeExtractor: defaultRangeExtractor,
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onChange: () => {
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},
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measureElement,
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initialRect: { width: 0, height: 0 },
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scrollMargin: 0,
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gap: 0,
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indexAttribute: "data-index",
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initialMeasurementsCache: [],
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lanes: 1,
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isScrollingResetDelay: 150,
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enabled: true,
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isRtl: false,
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useScrollendEvent: true,
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...opts2
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};
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};
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this.notify = (sync) => {
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var _a, _b;
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(_b = (_a = this.options).onChange) == null ? void 0 : _b.call(_a, this, sync);
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};
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this.maybeNotify = memo(
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() => {
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this.calculateRange();
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return [
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this.isScrolling,
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this.range ? this.range.startIndex : null,
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this.range ? this.range.endIndex : null
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];
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},
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(isScrolling) => {
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this.notify(isScrolling);
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},
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{
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key: process.env.NODE_ENV !== "production" && "maybeNotify",
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debug: () => this.options.debug,
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initialDeps: [
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this.isScrolling,
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this.range ? this.range.startIndex : null,
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this.range ? this.range.endIndex : null
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]
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}
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);
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this.cleanup = () => {
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this.unsubs.filter(Boolean).forEach((d) => d());
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this.unsubs = [];
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this.observer.disconnect();
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this.scrollElement = null;
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this.targetWindow = null;
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};
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this._didMount = () => {
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return () => {
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this.cleanup();
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};
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};
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this._willUpdate = () => {
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var _a;
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const scrollElement = this.options.enabled ? this.options.getScrollElement() : null;
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if (this.scrollElement !== scrollElement) {
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this.cleanup();
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if (!scrollElement) {
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this.maybeNotify();
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return;
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}
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this.scrollElement = scrollElement;
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if (this.scrollElement && "ownerDocument" in this.scrollElement) {
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this.targetWindow = this.scrollElement.ownerDocument.defaultView;
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} else {
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this.targetWindow = ((_a = this.scrollElement) == null ? void 0 : _a.window) ?? null;
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}
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this.elementsCache.forEach((cached) => {
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this.observer.observe(cached);
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});
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this._scrollToOffset(this.getScrollOffset(), {
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adjustments: void 0,
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behavior: void 0
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});
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this.unsubs.push(
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this.options.observeElementRect(this, (rect) => {
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this.scrollRect = rect;
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this.maybeNotify();
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})
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);
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this.unsubs.push(
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this.options.observeElementOffset(this, (offset, isScrolling) => {
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this.scrollAdjustments = 0;
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this.scrollDirection = isScrolling ? this.getScrollOffset() < offset ? "forward" : "backward" : null;
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this.scrollOffset = offset;
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this.isScrolling = isScrolling;
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this.maybeNotify();
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})
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);
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}
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};
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this.getSize = () => {
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if (!this.options.enabled) {
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this.scrollRect = null;
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return 0;
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}
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this.scrollRect = this.scrollRect ?? this.options.initialRect;
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return this.scrollRect[this.options.horizontal ? "width" : "height"];
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};
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this.getScrollOffset = () => {
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if (!this.options.enabled) {
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this.scrollOffset = null;
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return 0;
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}
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this.scrollOffset = this.scrollOffset ?? (typeof this.options.initialOffset === "function" ? this.options.initialOffset() : this.options.initialOffset);
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return this.scrollOffset;
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};
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this.getFurthestMeasurement = (measurements, index) => {
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const furthestMeasurementsFound = /* @__PURE__ */ new Map();
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const furthestMeasurements = /* @__PURE__ */ new Map();
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for (let m = index - 1; m >= 0; m--) {
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const measurement = measurements[m];
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if (furthestMeasurementsFound.has(measurement.lane)) {
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continue;
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}
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const previousFurthestMeasurement = furthestMeasurements.get(
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measurement.lane
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);
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if (previousFurthestMeasurement == null || measurement.end > previousFurthestMeasurement.end) {
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furthestMeasurements.set(measurement.lane, measurement);
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} else if (measurement.end < previousFurthestMeasurement.end) {
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furthestMeasurementsFound.set(measurement.lane, true);
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}
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if (furthestMeasurementsFound.size === this.options.lanes) {
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break;
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}
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}
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return furthestMeasurements.size === this.options.lanes ? Array.from(furthestMeasurements.values()).sort((a, b) => {
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if (a.end === b.end) {
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return a.index - b.index;
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}
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return a.end - b.end;
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})[0] : void 0;
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};
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this.getMeasurementOptions = memo(
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() => [
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this.options.count,
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this.options.paddingStart,
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this.options.scrollMargin,
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this.options.getItemKey,
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this.options.enabled
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],
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(count, paddingStart, scrollMargin, getItemKey, enabled) => {
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this.pendingMeasuredCacheIndexes = [];
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return {
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count,
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paddingStart,
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scrollMargin,
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getItemKey,
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enabled
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};
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},
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{
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key: false
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}
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);
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this.getMeasurements = memo(
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() => [this.getMeasurementOptions(), this.itemSizeCache],
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({ count, paddingStart, scrollMargin, getItemKey, enabled }, itemSizeCache) => {
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if (!enabled) {
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this.measurementsCache = [];
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this.itemSizeCache.clear();
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return [];
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}
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if (this.measurementsCache.length === 0) {
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this.measurementsCache = this.options.initialMeasurementsCache;
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this.measurementsCache.forEach((item) => {
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this.itemSizeCache.set(item.key, item.size);
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});
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}
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const min = this.pendingMeasuredCacheIndexes.length > 0 ? Math.min(...this.pendingMeasuredCacheIndexes) : 0;
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this.pendingMeasuredCacheIndexes = [];
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const measurements = this.measurementsCache.slice(0, min);
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for (let i = min; i < count; i++) {
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const key = getItemKey(i);
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const furthestMeasurement = this.options.lanes === 1 ? measurements[i - 1] : this.getFurthestMeasurement(measurements, i);
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const start = furthestMeasurement ? furthestMeasurement.end + this.options.gap : paddingStart + scrollMargin;
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const measuredSize = itemSizeCache.get(key);
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const size = typeof measuredSize === "number" ? measuredSize : this.options.estimateSize(i);
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const end = start + size;
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const lane = furthestMeasurement ? furthestMeasurement.lane : i % this.options.lanes;
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measurements[i] = {
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index: i,
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start,
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size,
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end,
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key,
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lane
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};
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}
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this.measurementsCache = measurements;
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return measurements;
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},
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{
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key: process.env.NODE_ENV !== "production" && "getMeasurements",
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debug: () => this.options.debug
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}
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);
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this.calculateRange = memo(
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() => [this.getMeasurements(), this.getSize(), this.getScrollOffset()],
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(measurements, outerSize, scrollOffset) => {
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return this.range = measurements.length > 0 && outerSize > 0 ? calculateRange({
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measurements,
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outerSize,
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scrollOffset
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}) : null;
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},
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{
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key: process.env.NODE_ENV !== "production" && "calculateRange",
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debug: () => this.options.debug
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}
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);
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this.getIndexes = memo(
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() => [
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this.options.rangeExtractor,
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this.calculateRange(),
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this.options.overscan,
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this.options.count
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],
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(rangeExtractor, range, overscan, count) => {
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return range === null ? [] : rangeExtractor({
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startIndex: range.startIndex,
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endIndex: range.endIndex,
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overscan,
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count
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});
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},
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{
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key: process.env.NODE_ENV !== "production" && "getIndexes",
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debug: () => this.options.debug
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}
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);
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this.indexFromElement = (node) => {
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const attributeName = this.options.indexAttribute;
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const indexStr = node.getAttribute(attributeName);
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if (!indexStr) {
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console.warn(
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`Missing attribute name '${attributeName}={index}' on measured element.`
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);
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return -1;
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}
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return parseInt(indexStr, 10);
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};
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this._measureElement = (node, entry) => {
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const index = this.indexFromElement(node);
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const item = this.measurementsCache[index];
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if (!item) {
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return;
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}
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const key = item.key;
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const prevNode = this.elementsCache.get(key);
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if (prevNode !== node) {
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if (prevNode) {
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this.observer.unobserve(prevNode);
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}
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this.observer.observe(node);
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this.elementsCache.set(key, node);
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}
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if (node.isConnected) {
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this.resizeItem(index, this.options.measureElement(node, entry, this));
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}
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};
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this.resizeItem = (index, size) => {
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const item = this.measurementsCache[index];
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if (!item) {
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return;
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}
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const itemSize = this.itemSizeCache.get(item.key) ?? item.size;
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const delta = size - itemSize;
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if (delta !== 0) {
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if (this.shouldAdjustScrollPositionOnItemSizeChange !== void 0 ? this.shouldAdjustScrollPositionOnItemSizeChange(item, delta, this) : item.start < this.getScrollOffset() + this.scrollAdjustments) {
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if (process.env.NODE_ENV !== "production" && this.options.debug) {
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console.info("correction", delta);
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}
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this._scrollToOffset(this.getScrollOffset(), {
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adjustments: this.scrollAdjustments += delta,
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behavior: void 0
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});
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}
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this.pendingMeasuredCacheIndexes.push(item.index);
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this.itemSizeCache = new Map(this.itemSizeCache.set(item.key, size));
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this.notify(false);
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}
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};
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this.measureElement = (node) => {
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if (!node) {
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this.elementsCache.forEach((cached, key) => {
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if (!cached.isConnected) {
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this.observer.unobserve(cached);
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this.elementsCache.delete(key);
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}
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});
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return;
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}
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this._measureElement(node, void 0);
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};
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this.getVirtualItems = memo(
|
|
() => [this.getIndexes(), this.getMeasurements()],
|
|
(indexes, measurements) => {
|
|
const virtualItems = [];
|
|
for (let k = 0, len = indexes.length; k < len; k++) {
|
|
const i = indexes[k];
|
|
const measurement = measurements[i];
|
|
virtualItems.push(measurement);
|
|
}
|
|
return virtualItems;
|
|
},
|
|
{
|
|
key: process.env.NODE_ENV !== "production" && "getVirtualItems",
|
|
debug: () => this.options.debug
|
|
}
|
|
);
|
|
this.getVirtualItemForOffset = (offset) => {
|
|
const measurements = this.getMeasurements();
|
|
if (measurements.length === 0) {
|
|
return void 0;
|
|
}
|
|
return notUndefined(
|
|
measurements[findNearestBinarySearch(
|
|
0,
|
|
measurements.length - 1,
|
|
(index) => notUndefined(measurements[index]).start,
|
|
offset
|
|
)]
|
|
);
|
|
};
|
|
this.getOffsetForAlignment = (toOffset, align) => {
|
|
const size = this.getSize();
|
|
const scrollOffset = this.getScrollOffset();
|
|
if (align === "auto") {
|
|
if (toOffset >= scrollOffset + size) {
|
|
align = "end";
|
|
}
|
|
}
|
|
if (align === "end") {
|
|
toOffset -= size;
|
|
}
|
|
const scrollSizeProp = this.options.horizontal ? "scrollWidth" : "scrollHeight";
|
|
const scrollSize = this.scrollElement ? "document" in this.scrollElement ? this.scrollElement.document.documentElement[scrollSizeProp] : this.scrollElement[scrollSizeProp] : 0;
|
|
const maxOffset = scrollSize - size;
|
|
return Math.max(Math.min(maxOffset, toOffset), 0);
|
|
};
|
|
this.getOffsetForIndex = (index, align = "auto") => {
|
|
index = Math.max(0, Math.min(index, this.options.count - 1));
|
|
const item = this.measurementsCache[index];
|
|
if (!item) {
|
|
return void 0;
|
|
}
|
|
const size = this.getSize();
|
|
const scrollOffset = this.getScrollOffset();
|
|
if (align === "auto") {
|
|
if (item.end >= scrollOffset + size - this.options.scrollPaddingEnd) {
|
|
align = "end";
|
|
} else if (item.start <= scrollOffset + this.options.scrollPaddingStart) {
|
|
align = "start";
|
|
} else {
|
|
return [scrollOffset, align];
|
|
}
|
|
}
|
|
const centerOffset = item.start - this.options.scrollPaddingStart + (item.size - size) / 2;
|
|
switch (align) {
|
|
case "center":
|
|
return [this.getOffsetForAlignment(centerOffset, align), align];
|
|
case "end":
|
|
return [
|
|
this.getOffsetForAlignment(
|
|
item.end + this.options.scrollPaddingEnd,
|
|
align
|
|
),
|
|
align
|
|
];
|
|
default:
|
|
return [
|
|
this.getOffsetForAlignment(
|
|
item.start - this.options.scrollPaddingStart,
|
|
align
|
|
),
|
|
align
|
|
];
|
|
}
|
|
};
|
|
this.isDynamicMode = () => this.elementsCache.size > 0;
|
|
this.cancelScrollToIndex = () => {
|
|
if (this.scrollToIndexTimeoutId !== null && this.targetWindow) {
|
|
this.targetWindow.clearTimeout(this.scrollToIndexTimeoutId);
|
|
this.scrollToIndexTimeoutId = null;
|
|
}
|
|
};
|
|
this.scrollToOffset = (toOffset, { align = "start", behavior } = {}) => {
|
|
this.cancelScrollToIndex();
|
|
if (behavior === "smooth" && this.isDynamicMode()) {
|
|
console.warn(
|
|
"The `smooth` scroll behavior is not fully supported with dynamic size."
|
|
);
|
|
}
|
|
this._scrollToOffset(this.getOffsetForAlignment(toOffset, align), {
|
|
adjustments: void 0,
|
|
behavior
|
|
});
|
|
};
|
|
this.scrollToIndex = (index, { align: initialAlign = "auto", behavior } = {}) => {
|
|
index = Math.max(0, Math.min(index, this.options.count - 1));
|
|
this.cancelScrollToIndex();
|
|
if (behavior === "smooth" && this.isDynamicMode()) {
|
|
console.warn(
|
|
"The `smooth` scroll behavior is not fully supported with dynamic size."
|
|
);
|
|
}
|
|
const offsetAndAlign = this.getOffsetForIndex(index, initialAlign);
|
|
if (!offsetAndAlign) return;
|
|
const [offset, align] = offsetAndAlign;
|
|
this._scrollToOffset(offset, { adjustments: void 0, behavior });
|
|
if (behavior !== "smooth" && this.isDynamicMode() && this.targetWindow) {
|
|
this.scrollToIndexTimeoutId = this.targetWindow.setTimeout(() => {
|
|
this.scrollToIndexTimeoutId = null;
|
|
const elementInDOM = this.elementsCache.has(
|
|
this.options.getItemKey(index)
|
|
);
|
|
if (elementInDOM) {
|
|
const [latestOffset] = notUndefined(
|
|
this.getOffsetForIndex(index, align)
|
|
);
|
|
if (!approxEqual(latestOffset, this.getScrollOffset())) {
|
|
this.scrollToIndex(index, { align, behavior });
|
|
}
|
|
} else {
|
|
this.scrollToIndex(index, { align, behavior });
|
|
}
|
|
});
|
|
}
|
|
};
|
|
this.scrollBy = (delta, { behavior } = {}) => {
|
|
this.cancelScrollToIndex();
|
|
if (behavior === "smooth" && this.isDynamicMode()) {
|
|
console.warn(
|
|
"The `smooth` scroll behavior is not fully supported with dynamic size."
|
|
);
|
|
}
|
|
this._scrollToOffset(this.getScrollOffset() + delta, {
|
|
adjustments: void 0,
|
|
behavior
|
|
});
|
|
};
|
|
this.getTotalSize = () => {
|
|
var _a;
|
|
const measurements = this.getMeasurements();
|
|
let end;
|
|
if (measurements.length === 0) {
|
|
end = this.options.paddingStart;
|
|
} else {
|
|
end = this.options.lanes === 1 ? ((_a = measurements[measurements.length - 1]) == null ? void 0 : _a.end) ?? 0 : Math.max(
|
|
...measurements.slice(-this.options.lanes).map((m) => m.end)
|
|
);
|
|
}
|
|
return Math.max(
|
|
end - this.options.scrollMargin + this.options.paddingEnd,
|
|
0
|
|
);
|
|
};
|
|
this._scrollToOffset = (offset, {
|
|
adjustments,
|
|
behavior
|
|
}) => {
|
|
this.options.scrollToFn(offset, { behavior, adjustments }, this);
|
|
};
|
|
this.measure = () => {
|
|
this.itemSizeCache = /* @__PURE__ */ new Map();
|
|
this.notify(false);
|
|
};
|
|
this.setOptions(opts);
|
|
}
|
|
}
|
|
const findNearestBinarySearch = (low, high, getCurrentValue, value) => {
|
|
while (low <= high) {
|
|
const middle = (low + high) / 2 | 0;
|
|
const currentValue = getCurrentValue(middle);
|
|
if (currentValue < value) {
|
|
low = middle + 1;
|
|
} else if (currentValue > value) {
|
|
high = middle - 1;
|
|
} else {
|
|
return middle;
|
|
}
|
|
}
|
|
if (low > 0) {
|
|
return low - 1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
};
|
|
function calculateRange({
|
|
measurements,
|
|
outerSize,
|
|
scrollOffset
|
|
}) {
|
|
const count = measurements.length - 1;
|
|
const getOffset = (index) => measurements[index].start;
|
|
const startIndex = findNearestBinarySearch(0, count, getOffset, scrollOffset);
|
|
let endIndex = startIndex;
|
|
while (endIndex < count && measurements[endIndex].end < scrollOffset + outerSize) {
|
|
endIndex++;
|
|
}
|
|
return { startIndex, endIndex };
|
|
}
|
|
export {
|
|
Virtualizer,
|
|
approxEqual,
|
|
debounce,
|
|
defaultKeyExtractor,
|
|
defaultRangeExtractor,
|
|
elementScroll,
|
|
measureElement,
|
|
memo,
|
|
notUndefined,
|
|
observeElementOffset,
|
|
observeElementRect,
|
|
observeWindowOffset,
|
|
observeWindowRect,
|
|
windowScroll
|
|
};
|
|
//# sourceMappingURL=index.js.map
|