import { debounce, memo, notUndefined, approxEqual } from "/_nuxt/@fs/D:/speckle-server/packages/ui-components/node_modules/@tanstack/virtual-core/dist/esm/utils.js?v=e4f18c29";
const defaultKeyExtractor = (index) => index;
const defaultRangeExtractor = (range) => {
  const start = Math.max(range.startIndex - range.overscan, 0);
  const end = Math.min(range.endIndex + range.overscan, range.count - 1);
  const arr = [];
  for (let i = start; i <= end; i++) {
    arr.push(i);
  }
  return arr;
};
const observeElementRect = (instance, cb) => {
  const element = instance.scrollElement;
  if (!element) {
    return;
  }
  const targetWindow = instance.targetWindow;
  if (!targetWindow) {
    return;
  }
  const handler = (rect) => {
    const { width, height } = rect;
    cb({ width: Math.round(width), height: Math.round(height) });
  };
  handler(element.getBoundingClientRect());
  if (!targetWindow.ResizeObserver) {
    return () => {
    };
  }
  const observer = new targetWindow.ResizeObserver((entries) => {
    const run = () => {
      const entry = entries[0];
      if (entry == null ? void 0 : entry.borderBoxSize) {
        const box = entry.borderBoxSize[0];
        if (box) {
          handler({ width: box.inlineSize, height: box.blockSize });
          return;
        }
      }
      handler(element.getBoundingClientRect());
    };
    instance.options.useAnimationFrameWithResizeObserver ? requestAnimationFrame(run) : run();
  });
  observer.observe(element, { box: "border-box" });
  return () => {
    observer.unobserve(element);
  };
};
const addEventListenerOptions = {
  passive: true
};
const observeWindowRect = (instance, cb) => {
  const element = instance.scrollElement;
  if (!element) {
    return;
  }
  const handler = () => {
    cb({ width: element.innerWidth, height: element.innerHeight });
  };
  handler();
  element.addEventListener("resize", handler, addEventListenerOptions);
  return () => {
    element.removeEventListener("resize", handler);
  };
};
const supportsScrollend = typeof window == "undefined" ? true : "onscrollend" in window;
const observeElementOffset = (instance, cb) => {
  const element = instance.scrollElement;
  if (!element) {
    return;
  }
  const targetWindow = instance.targetWindow;
  if (!targetWindow) {
    return;
  }
  let offset = 0;
  const fallback = instance.options.useScrollendEvent && supportsScrollend ? () => void 0 : debounce(
    targetWindow,
    () => {
      cb(offset, false);
    },
    instance.options.isScrollingResetDelay
  );
  const createHandler = (isScrolling) => () => {
    const { horizontal, isRtl } = instance.options;
    offset = horizontal ? element["scrollLeft"] * (isRtl && -1 || 1) : element["scrollTop"];
    fallback();
    cb(offset, isScrolling);
  };
  const handler = createHandler(true);
  const endHandler = createHandler(false);
  endHandler();
  element.addEventListener("scroll", handler, addEventListenerOptions);
  const registerScrollendEvent = instance.options.useScrollendEvent && supportsScrollend;
  if (registerScrollendEvent) {
    element.addEventListener("scrollend", endHandler, addEventListenerOptions);
  }
  return () => {
    element.removeEventListener("scroll", handler);
    if (registerScrollendEvent) {
      element.removeEventListener("scrollend", endHandler);
    }
  };
};
const observeWindowOffset = (instance, cb) => {
  const element = instance.scrollElement;
  if (!element) {
    return;
  }
  const targetWindow = instance.targetWindow;
  if (!targetWindow) {
    return;
  }
  let offset = 0;
  const fallback = instance.options.useScrollendEvent && supportsScrollend ? () => void 0 : debounce(
    targetWindow,
    () => {
      cb(offset, false);
    },
    instance.options.isScrollingResetDelay
  );
  const createHandler = (isScrolling) => () => {
    offset = element[instance.options.horizontal ? "scrollX" : "scrollY"];
    fallback();
    cb(offset, isScrolling);
  };
  const handler = createHandler(true);
  const endHandler = createHandler(false);
  endHandler();
  element.addEventListener("scroll", handler, addEventListenerOptions);
  const registerScrollendEvent = instance.options.useScrollendEvent && supportsScrollend;
  if (registerScrollendEvent) {
    element.addEventListener("scrollend", endHandler, addEventListenerOptions);
  }
  return () => {
    element.removeEventListener("scroll", handler);
    if (registerScrollendEvent) {
      element.removeEventListener("scrollend", endHandler);
    }
  };
};
const measureElement = (element, entry, instance) => {
  if (entry == null ? void 0 : entry.borderBoxSize) {
    const box = entry.borderBoxSize[0];
    if (box) {
      const size = Math.round(
        box[instance.options.horizontal ? "inlineSize" : "blockSize"]
      );
      return size;
    }
  }
  return Math.round(
    element.getBoundingClientRect()[instance.options.horizontal ? "width" : "height"]
  );
};
const windowScroll = (offset, {
  adjustments = 0,
  behavior
}, instance) => {
  var _a, _b;
  const toOffset = offset + adjustments;
  (_b = (_a = instance.scrollElement) == null ? void 0 : _a.scrollTo) == null ? void 0 : _b.call(_a, {
    [instance.options.horizontal ? "left" : "top"]: toOffset,
    behavior
  });
};
const elementScroll = (offset, {
  adjustments = 0,
  behavior
}, instance) => {
  var _a, _b;
  const toOffset = offset + adjustments;
  (_b = (_a = instance.scrollElement) == null ? void 0 : _a.scrollTo) == null ? void 0 : _b.call(_a, {
    [instance.options.horizontal ? "left" : "top"]: toOffset,
    behavior
  });
};
class Virtualizer {
  constructor(opts) {
    this.unsubs = [];
    this.scrollElement = null;
    this.targetWindow = null;
    this.isScrolling = false;
    this.scrollToIndexTimeoutId = null;
    this.measurementsCache = [];
    this.itemSizeCache = /* @__PURE__ */ new Map();
    this.pendingMeasuredCacheIndexes = [];
    this.scrollRect = null;
    this.scrollOffset = null;
    this.scrollDirection = null;
    this.scrollAdjustments = 0;
    this.elementsCache = /* @__PURE__ */ new Map();
    this.observer = /* @__PURE__ */ (() => {
      let _ro = null;
      const get = () => {
        if (_ro) {
          return _ro;
        }
        if (!this.targetWindow || !this.targetWindow.ResizeObserver) {
          return null;
        }
        return _ro = new this.targetWindow.ResizeObserver((entries) => {
          entries.forEach((entry) => {
            const run = () => {
              this._measureElement(entry.target, entry);
            };
            this.options.useAnimationFrameWithResizeObserver ? requestAnimationFrame(run) : run();
          });
        });
      };
      return {
        disconnect: () => {
          var _a;
          (_a = get()) == null ? void 0 : _a.disconnect();
          _ro = null;
        },
        observe: (target) => {
          var _a;
          return (_a = get()) == null ? void 0 : _a.observe(target, { box: "border-box" });
        },
        unobserve: (target) => {
          var _a;
          return (_a = get()) == null ? void 0 : _a.unobserve(target);
        }
      };
    })();
    this.range = null;
    this.setOptions = (opts2) => {
      Object.entries(opts2).forEach(([key, value]) => {
        if (typeof value === "undefined") delete opts2[key];
      });
      this.options = {
        debug: false,
        initialOffset: 0,
        overscan: 1,
        paddingStart: 0,
        paddingEnd: 0,
        scrollPaddingStart: 0,
        scrollPaddingEnd: 0,
        horizontal: false,
        getItemKey: defaultKeyExtractor,
        rangeExtractor: defaultRangeExtractor,
        onChange: () => {
        },
        measureElement,
        initialRect: { width: 0, height: 0 },
        scrollMargin: 0,
        gap: 0,
        indexAttribute: "data-index",
        initialMeasurementsCache: [],
        lanes: 1,
        isScrollingResetDelay: 150,
        enabled: true,
        isRtl: false,
        useScrollendEvent: false,
        useAnimationFrameWithResizeObserver: false,
        ...opts2
      };
    };
    this.notify = (sync) => {
      var _a, _b;
      (_b = (_a = this.options).onChange) == null ? void 0 : _b.call(_a, this, sync);
    };
    this.maybeNotify = memo(
      () => {
        this.calculateRange();
        return [
          this.isScrolling,
          this.range ? this.range.startIndex : null,
          this.range ? this.range.endIndex : null
        ];
      },
      (isScrolling) => {
        this.notify(isScrolling);
      },
      {
        key: "maybeNotify",
        debug: () => this.options.debug,
        initialDeps: [
          this.isScrolling,
          this.range ? this.range.startIndex : null,
          this.range ? this.range.endIndex : null
        ]
      }
    );
    this.cleanup = () => {
      this.unsubs.filter(Boolean).forEach((d) => d());
      this.unsubs = [];
      this.observer.disconnect();
      this.scrollElement = null;
      this.targetWindow = null;
    };
    this._didMount = () => {
      return () => {
        this.cleanup();
      };
    };
    this._willUpdate = () => {
      var _a;
      const scrollElement = this.options.enabled ? this.options.getScrollElement() : null;
      if (this.scrollElement !== scrollElement) {
        this.cleanup();
        if (!scrollElement) {
          this.maybeNotify();
          return;
        }
        this.scrollElement = scrollElement;
        if (this.scrollElement && "ownerDocument" in this.scrollElement) {
          this.targetWindow = this.scrollElement.ownerDocument.defaultView;
        } else {
          this.targetWindow = ((_a = this.scrollElement) == null ? void 0 : _a.window) ?? null;
        }
        this.elementsCache.forEach((cached) => {
          this.observer.observe(cached);
        });
        this._scrollToOffset(this.getScrollOffset(), {
          adjustments: void 0,
          behavior: void 0
        });
        this.unsubs.push(
          this.options.observeElementRect(this, (rect) => {
            this.scrollRect = rect;
            this.maybeNotify();
          })
        );
        this.unsubs.push(
          this.options.observeElementOffset(this, (offset, isScrolling) => {
            this.scrollAdjustments = 0;
            this.scrollDirection = isScrolling ? this.getScrollOffset() < offset ? "forward" : "backward" : null;
            this.scrollOffset = offset;
            this.isScrolling = isScrolling;
            this.maybeNotify();
          })
        );
      }
    };
    this.getSize = () => {
      if (!this.options.enabled) {
        this.scrollRect = null;
        return 0;
      }
      this.scrollRect = this.scrollRect ?? this.options.initialRect;
      return this.scrollRect[this.options.horizontal ? "width" : "height"];
    };
    this.getScrollOffset = () => {
      if (!this.options.enabled) {
        this.scrollOffset = null;
        return 0;
      }
      this.scrollOffset = this.scrollOffset ?? (typeof this.options.initialOffset === "function" ? this.options.initialOffset() : this.options.initialOffset);
      return this.scrollOffset;
    };
    this.getFurthestMeasurement = (measurements, index) => {
      const furthestMeasurementsFound = /* @__PURE__ */ new Map();
      const furthestMeasurements = /* @__PURE__ */ new Map();
      for (let m = index - 1; m >= 0; m--) {
        const measurement = measurements[m];
        if (furthestMeasurementsFound.has(measurement.lane)) {
          continue;
        }
        const previousFurthestMeasurement = furthestMeasurements.get(
          measurement.lane
        );
        if (previousFurthestMeasurement == null || measurement.end > previousFurthestMeasurement.end) {
          furthestMeasurements.set(measurement.lane, measurement);
        } else if (measurement.end < previousFurthestMeasurement.end) {
          furthestMeasurementsFound.set(measurement.lane, true);
        }
        if (furthestMeasurementsFound.size === this.options.lanes) {
          break;
        }
      }
      return furthestMeasurements.size === this.options.lanes ? Array.from(furthestMeasurements.values()).sort((a, b) => {
        if (a.end === b.end) {
          return a.index - b.index;
        }
        return a.end - b.end;
      })[0] : void 0;
    };
    this.getMeasurementOptions = memo(
      () => [
        this.options.count,
        this.options.paddingStart,
        this.options.scrollMargin,
        this.options.getItemKey,
        this.options.enabled
      ],
      (count, paddingStart, scrollMargin, getItemKey, enabled) => {
        this.pendingMeasuredCacheIndexes = [];
        return {
          count,
          paddingStart,
          scrollMargin,
          getItemKey,
          enabled
        };
      },
      {
        key: false
      }
    );
    this.getMeasurements = memo(
      () => [this.getMeasurementOptions(), this.itemSizeCache],
      ({ count, paddingStart, scrollMargin, getItemKey, enabled }, itemSizeCache) => {
        if (!enabled) {
          this.measurementsCache = [];
          this.itemSizeCache.clear();
          return [];
        }
        if (this.measurementsCache.length === 0) {
          this.measurementsCache = this.options.initialMeasurementsCache;
          this.measurementsCache.forEach((item) => {
            this.itemSizeCache.set(item.key, item.size);
          });
        }
        const min = this.pendingMeasuredCacheIndexes.length > 0 ? Math.min(...this.pendingMeasuredCacheIndexes) : 0;
        this.pendingMeasuredCacheIndexes = [];
        const measurements = this.measurementsCache.slice(0, min);
        for (let i = min; i < count; i++) {
          const key = getItemKey(i);
          const furthestMeasurement = this.options.lanes === 1 ? measurements[i - 1] : this.getFurthestMeasurement(measurements, i);
          const start = furthestMeasurement ? furthestMeasurement.end + this.options.gap : paddingStart + scrollMargin;
          const measuredSize = itemSizeCache.get(key);
          const size = typeof measuredSize === "number" ? measuredSize : this.options.estimateSize(i);
          const end = start + size;
          const lane = furthestMeasurement ? furthestMeasurement.lane : i % this.options.lanes;
          measurements[i] = {
            index: i,
            start,
            size,
            end,
            key,
            lane
          };
        }
        this.measurementsCache = measurements;
        return measurements;
      },
      {
        key: "getMeasurements",
        debug: () => this.options.debug
      }
    );
    this.calculateRange = memo(
      () => [
        this.getMeasurements(),
        this.getSize(),
        this.getScrollOffset(),
        this.options.lanes
      ],
      (measurements, outerSize, scrollOffset, lanes) => {
        return this.range = measurements.length > 0 && outerSize > 0 ? calculateRange({
          measurements,
          outerSize,
          scrollOffset,
          lanes
        }) : null;
      },
      {
        key: "calculateRange",
        debug: () => this.options.debug
      }
    );
    this.getVirtualIndexes = memo(
      () => {
        let startIndex = null;
        let endIndex = null;
        const range = this.calculateRange();
        if (range) {
          startIndex = range.startIndex;
          endIndex = range.endIndex;
        }
        this.maybeNotify.updateDeps([this.isScrolling, startIndex, endIndex]);
        return [
          this.options.rangeExtractor,
          this.options.overscan,
          this.options.count,
          startIndex,
          endIndex
        ];
      },
      (rangeExtractor, overscan, count, startIndex, endIndex) => {
        return startIndex === null || endIndex === null ? [] : rangeExtractor({
          startIndex,
          endIndex,
          overscan,
          count
        });
      },
      {
        key: "getVirtualIndexes",
        debug: () => this.options.debug
      }
    );
    this.indexFromElement = (node) => {
      const attributeName = this.options.indexAttribute;
      const indexStr = node.getAttribute(attributeName);
      if (!indexStr) {
        console.warn(
          `Missing attribute name '${attributeName}={index}' on measured element.`
        );
        return -1;
      }
      return parseInt(indexStr, 10);
    };
    this._measureElement = (node, entry) => {
      const index = this.indexFromElement(node);
      const item = this.measurementsCache[index];
      if (!item) {
        return;
      }
      const key = item.key;
      const prevNode = this.elementsCache.get(key);
      if (prevNode !== node) {
        if (prevNode) {
          this.observer.unobserve(prevNode);
        }
        this.observer.observe(node);
        this.elementsCache.set(key, node);
      }
      if (node.isConnected) {
        this.resizeItem(index, this.options.measureElement(node, entry, this));
      }
    };
    this.resizeItem = (index, size) => {
      const item = this.measurementsCache[index];
      if (!item) {
        return;
      }
      const itemSize = this.itemSizeCache.get(item.key) ?? item.size;
      const delta = size - itemSize;
      if (delta !== 0) {
        if (this.shouldAdjustScrollPositionOnItemSizeChange !== void 0 ? this.shouldAdjustScrollPositionOnItemSizeChange(item, delta, this) : item.start < this.getScrollOffset() + this.scrollAdjustments) {
          if (this.options.debug) {
            console.info("correction", delta);
          }
          this._scrollToOffset(this.getScrollOffset(), {
            adjustments: this.scrollAdjustments += delta,
            behavior: void 0
          });
        }
        this.pendingMeasuredCacheIndexes.push(item.index);
        this.itemSizeCache = new Map(this.itemSizeCache.set(item.key, size));
        this.notify(false);
      }
    };
    this.measureElement = (node) => {
      if (!node) {
        this.elementsCache.forEach((cached, key) => {
          if (!cached.isConnected) {
            this.observer.unobserve(cached);
            this.elementsCache.delete(key);
          }
        });
        return;
      }
      this._measureElement(node, void 0);
    };
    this.getVirtualItems = memo(
      () => [this.getVirtualIndexes(), 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: "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, itemSize = 0) => {
      const size = this.getSize();
      const scrollOffset = this.getScrollOffset();
      if (align === "auto") {
        align = toOffset >= scrollOffset + size ? "end" : "start";
      }
      if (align === "center") {
        toOffset += (itemSize - size) / 2;
      } else 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 toOffset = align === "end" ? item.end + this.options.scrollPaddingEnd : item.start - this.options.scrollPaddingStart;
      return [
        this.getOffsetForAlignment(toOffset, align, item.size),
        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 if (this.options.lanes === 1) {
        end = ((_a = measurements[measurements.length - 1]) == null ? void 0 : _a.end) ?? 0;
      } else {
        const endByLane = Array(this.options.lanes).fill(null);
        let endIndex = measurements.length - 1;
        while (endIndex >= 0 && endByLane.some((val) => val === null)) {
          const item = measurements[endIndex];
          if (endByLane[item.lane] === null) {
            endByLane[item.lane] = item.end;
          }
          endIndex--;
        }
        end = Math.max(...endByLane.filter((val) => val !== null));
      }
      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,
  lanes
}) {
  const lastIndex = measurements.length - 1;
  const getOffset = (index) => measurements[index].start;
  if (measurements.length <= lanes) {
    return {
      startIndex: 0,
      endIndex: lastIndex
    };
  }
  let startIndex = findNearestBinarySearch(
    0,
    lastIndex,
    getOffset,
    scrollOffset
  );
  let endIndex = startIndex;
  if (lanes === 1) {
    while (endIndex < lastIndex && measurements[endIndex].end < scrollOffset + outerSize) {
      endIndex++;
    }
  } else if (lanes > 1) {
    const endPerLane = Array(lanes).fill(0);
    while (endIndex < lastIndex && endPerLane.some((pos) => pos < scrollOffset + outerSize)) {
      const item = measurements[endIndex];
      endPerLane[item.lane] = item.end;
      endIndex++;
    }
    const startPerLane = Array(lanes).fill(scrollOffset + outerSize);
    while (startIndex >= 0 && startPerLane.some((pos) => pos >= scrollOffset)) {
      const item = measurements[startIndex];
      startPerLane[item.lane] = item.start;
      startIndex--;
    }
    startIndex = Math.max(0, startIndex - startIndex % lanes);
    endIndex = Math.min(lastIndex, endIndex + (lanes - 1 - endIndex % lanes));
  }
  return { startIndex, endIndex };
}
export {
  Virtualizer,
  approxEqual,
  debounce,
  defaultKeyExtractor,
  defaultRangeExtractor,
  elementScroll,
  measureElement,
  memo,
  notUndefined,
  observeElementOffset,
  observeElementRect,
  observeWindowOffset,
  observeWindowRect,
  windowScroll
};

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{ approxEqual, debounce, memo, notUndefined } from './utils'\n\nexport * from './utils'\n\n//\n\ntype ScrollDirection = 'forward' | 'backward'\n\ntype ScrollAlignment = 'start' | 'center' | 'end' | 'auto'\n\ntype ScrollBehavior = 'auto' | 'smooth'\n\nexport interface ScrollToOptions {\n  align?: ScrollAlignment\n  behavior?: ScrollBehavior\n}\n\ntype ScrollToOffsetOptions = ScrollToOptions\n\ntype ScrollToIndexOptions = ScrollToOptions\n\nexport interface Range {\n  startIndex: number\n  endIndex: number\n  overscan: number\n  count: number\n}\n\ntype Key = number | string | bigint\n\nexport interface VirtualItem {\n  key: Key\n  index: number\n  start: number\n  end: number\n  size: number\n  lane: number\n}\n\nexport interface Rect {\n  width: number\n  height: number\n}\n\n//\n\nexport const defaultKeyExtractor = (index: number) => index\n\nexport const defaultRangeExtractor = (range: Range) => {\n  const start = Math.max(range.startIndex - range.overscan, 0)\n  const end = Math.min(range.endIndex + range.overscan, range.count - 1)\n\n  const arr = []\n\n  for (let i = start; i <= end; i++) {\n    arr.push(i)\n  }\n\n  return arr\n}\n\nexport const observeElementRect = <T extends Element>(\n  instance: Virtualizer<T, any>,\n  cb: (rect: Rect) => void,\n) => {\n  const element = instance.scrollElement\n  if (!element) {\n    return\n  }\n  const targetWindow = instance.targetWindow\n  if (!targetWindow) {\n    return\n  }\n\n  const handler = (rect: Rect) => {\n    const { width, height } = rect\n    cb({ width: Math.round(width), height: Math.round(height) })\n  }\n\n  handler(element.getBoundingClientRect())\n\n  if (!targetWindow.ResizeObserver) {\n    return () => {}\n  }\n\n  const observer = new targetWindow.ResizeObserver((entries) => {\n    const run = () => {\n      const entry = entries[0]\n      if (entry?.borderBoxSize) {\n        const box = entry.borderBoxSize[0]\n        if (box) {\n          handler({ width: box.inlineSize, height: box.blockSize })\n          return\n        }\n      }\n      handler(element.getBoundingClientRect())\n    }\n\n    instance.options.useAnimationFrameWithResizeObserver\n      ? requestAnimationFrame(run)\n      : run()\n  })\n\n  observer.observe(element, { box: 'border-box' })\n\n  return () => {\n    observer.unobserve(element)\n  }\n}\n\nconst addEventListenerOptions = {\n  passive: true,\n}\n\nexport const observeWindowRect = (\n  instance: Virtualizer<Window, any>,\n  cb: (rect: Rect) => void,\n) => {\n  const element = instance.scrollElement\n  if (!element) {\n    return\n  }\n\n  const handler = () => {\n    cb({ width: element.innerWidth, height: element.innerHeight })\n  }\n  handler()\n\n  element.addEventListener('resize', handler, addEventListenerOptions)\n\n  return () => {\n    element.removeEventListener('resize', handler)\n  }\n}\n\nconst supportsScrollend =\n  typeof window == 'undefined' ? true : 'onscrollend' in window\n\ntype ObserveOffsetCallBack = (offset: number, isScrolling: boolean) => void\n\nexport const observeElementOffset = <T extends Element>(\n  instance: Virtualizer<T, any>,\n  cb: ObserveOffsetCallBack,\n) => {\n  const element = instance.scrollElement\n  if (!element) {\n    return\n  }\n  const targetWindow = instance.targetWindow\n  if (!targetWindow) {\n    return\n  }\n\n  let offset = 0\n  const fallback =\n    instance.options.useScrollendEvent && supportsScrollend\n      ? () => undefined\n      : debounce(\n          targetWindow,\n          () => {\n            cb(offset, false)\n          },\n          instance.options.isScrollingResetDelay,\n        )\n\n  const createHandler = (isScrolling: boolean) => () => {\n    const { horizontal, isRtl } = instance.options\n    offset = horizontal\n      ? element['scrollLeft'] * ((isRtl && -1) || 1)\n      : element['scrollTop']\n    fallback()\n    cb(offset, isScrolling)\n  }\n  const handler = createHandler(true)\n  const endHandler = createHandler(false)\n  endHandler()\n\n  element.addEventListener('scroll', handler, addEventListenerOptions)\n  const registerScrollendEvent =\n    instance.options.useScrollendEvent && supportsScrollend\n  if (registerScrollendEvent) {\n    element.addEventListener('scrollend', endHandler, addEventListenerOptions)\n  }\n  return () => {\n    element.removeEventListener('scroll', handler)\n    if (registerScrollendEvent) {\n      element.removeEventListener('scrollend', endHandler)\n    }\n  }\n}\n\nexport const observeWindowOffset = (\n  instance: Virtualizer<Window, any>,\n  cb: ObserveOffsetCallBack,\n) => {\n  const element = instance.scrollElement\n  if (!element) {\n    return\n  }\n  const targetWindow = instance.targetWindow\n  if (!targetWindow) {\n    return\n  }\n\n  let offset = 0\n  const fallback =\n    instance.options.useScrollendEvent && supportsScrollend\n      ? () => undefined\n      : debounce(\n          targetWindow,\n          () => {\n            cb(offset, false)\n          },\n          instance.options.isScrollingResetDelay,\n        )\n\n  const createHandler = (isScrolling: boolean) => () => {\n    offset = element[instance.options.horizontal ? 'scrollX' : 'scrollY']\n    fallback()\n    cb(offset, isScrolling)\n  }\n  const handler = createHandler(true)\n  const endHandler = createHandler(false)\n  endHandler()\n\n  element.addEventListener('scroll', handler, addEventListenerOptions)\n  const registerScrollendEvent =\n    instance.options.useScrollendEvent && supportsScrollend\n  if (registerScrollendEvent) {\n    element.addEventListener('scrollend', endHandler, addEventListenerOptions)\n  }\n  return () => {\n    element.removeEventListener('scroll', handler)\n    if (registerScrollendEvent) {\n      element.removeEventListener('scrollend', endHandler)\n    }\n  }\n}\n\nexport const measureElement = <TItemElement extends Element>(\n  element: TItemElement,\n  entry: ResizeObserverEntry | undefined,\n  instance: Virtualizer<any, TItemElement>,\n) => {\n  if (entry?.borderBoxSize) {\n    const box = entry.borderBoxSize[0]\n    if (box) {\n      const size = Math.round(\n        box[instance.options.horizontal ? 'inlineSize' : 'blockSize'],\n      )\n      return size\n    }\n  }\n  return Math.round(\n    element.getBoundingClientRect()[\n      instance.options.horizontal ? 'width' : 'height'\n    ],\n  )\n}\n\nexport const windowScroll = <T extends Window>(\n  offset: number,\n  {\n    adjustments = 0,\n    behavior,\n  }: { adjustments?: number; behavior?: ScrollBehavior },\n  instance: Virtualizer<T, any>,\n) => {\n  const toOffset = offset + adjustments\n\n  instance.scrollElement?.scrollTo?.({\n    [instance.options.horizontal ? 'left' : 'top']: toOffset,\n    behavior,\n  })\n}\n\nexport const elementScroll = <T extends Element>(\n  offset: number,\n  {\n    adjustments = 0,\n    behavior,\n  }: { adjustments?: number; behavior?: ScrollBehavior },\n  instance: Virtualizer<T, any>,\n) => {\n  const toOffset = offset + adjustments\n\n  instance.scrollElement?.scrollTo?.({\n    [instance.options.horizontal ? 'left' : 'top']: toOffset,\n    behavior,\n  })\n}\n\nexport interface VirtualizerOptions<\n  TScrollElement extends Element | Window,\n  TItemElement extends Element,\n> {\n  // Required from the user\n  count: number\n  getScrollElement: () => TScrollElement | null\n  estimateSize: (index: number) => number\n\n  // Required from the framework adapter (but can be overridden)\n  scrollToFn: (\n    offset: number,\n    options: { adjustments?: number; behavior?: ScrollBehavior },\n    instance: Virtualizer<TScrollElement, TItemElement>,\n  ) => void\n  observeElementRect: (\n    instance: Virtualizer<TScrollElement, TItemElement>,\n    cb: (rect: Rect) => void,\n  ) => void | (() => void)\n  observeElementOffset: (\n    instance: Virtualizer<TScrollElement, TItemElement>,\n    cb: ObserveOffsetCallBack,\n  ) => void | (() => void)\n  // Optional\n  debug?: boolean\n  initialRect?: Rect\n  onChange?: (\n    instance: Virtualizer<TScrollElement, TItemElement>,\n    sync: boolean,\n  ) => void\n  measureElement?: (\n    element: TItemElement,\n    entry: ResizeObserverEntry | undefined,\n    instance: Virtualizer<TScrollElement, TItemElement>,\n  ) => number\n  overscan?: number\n  horizontal?: boolean\n  paddingStart?: number\n  paddingEnd?: number\n  scrollPaddingStart?: number\n  scrollPaddingEnd?: number\n  initialOffset?: number | (() => number)\n  getItemKey?: (index: number) => Key\n  rangeExtractor?: (range: Range) => Array<number>\n  scrollMargin?: number\n  gap?: number\n  indexAttribute?: string\n  initialMeasurementsCache?: Array<VirtualItem>\n  lanes?: number\n  isScrollingResetDelay?: number\n  useScrollendEvent?: boolean\n  enabled?: boolean\n  isRtl?: boolean\n  useAnimationFrameWithResizeObserver?: boolean\n}\n\nexport class Virtualizer<\n  TScrollElement extends Element | Window,\n  TItemElement extends Element,\n> {\n  private unsubs: Array<void | (() => void)> = []\n  options!: Required<VirtualizerOptions<TScrollElement, TItemElement>>\n  scrollElement: TScrollElement | null = null\n  targetWindow: (Window & typeof globalThis) | null = null\n  isScrolling = false\n  private scrollToIndexTimeoutId: number | null = null\n  measurementsCache: Array<VirtualItem> = []\n  private itemSizeCache = new Map<Key, number>()\n  private pendingMeasuredCacheIndexes: Array<number> = []\n  scrollRect: Rect | null = null\n  scrollOffset: number | null = null\n  scrollDirection: ScrollDirection | null = null\n  private scrollAdjustments = 0\n  shouldAdjustScrollPositionOnItemSizeChange:\n    | undefined\n    | ((\n        item: VirtualItem,\n        delta: number,\n        instance: Virtualizer<TScrollElement, TItemElement>,\n      ) => boolean)\n  elementsCache = new Map<Key, TItemElement>()\n  private observer = (() => {\n    let _ro: ResizeObserver | null = null\n\n    const get = () => {\n      if (_ro) {\n        return _ro\n      }\n\n      if (!this.targetWindow || !this.targetWindow.ResizeObserver) {\n        return null\n      }\n\n      return (_ro = new this.targetWindow.ResizeObserver((entries) => {\n        entries.forEach((entry) => {\n          const run = () => {\n            this._measureElement(entry.target as TItemElement, entry)\n          }\n          this.options.useAnimationFrameWithResizeObserver\n            ? requestAnimationFrame(run)\n            : run()\n        })\n      }))\n    }\n\n    return {\n      disconnect: () => {\n        get()?.disconnect()\n        _ro = null\n      },\n      observe: (target: Element) =>\n        get()?.observe(target, { box: 'border-box' }),\n      unobserve: (target: Element) => get()?.unobserve(target),\n    }\n  })()\n  range: { startIndex: number; endIndex: number } | null = null\n\n  constructor(opts: VirtualizerOptions<TScrollElement, TItemElement>) {\n    this.setOptions(opts)\n  }\n\n  setOptions = (opts: VirtualizerOptions<TScrollElement, TItemElement>) => {\n    Object.entries(opts).forEach(([key, value]) => {\n      if (typeof value === 'undefined') delete (opts as any)[key]\n    })\n\n    this.options = {\n      debug: false,\n      initialOffset: 0,\n      overscan: 1,\n      paddingStart: 0,\n      paddingEnd: 0,\n      scrollPaddingStart: 0,\n      scrollPaddingEnd: 0,\n      horizontal: false,\n      getItemKey: defaultKeyExtractor,\n      rangeExtractor: defaultRangeExtractor,\n      onChange: () => {},\n      measureElement,\n      initialRect: { width: 0, height: 0 },\n      scrollMargin: 0,\n      gap: 0,\n      indexAttribute: 'data-index',\n      initialMeasurementsCache: [],\n      lanes: 1,\n      isScrollingResetDelay: 150,\n      enabled: true,\n      isRtl: false,\n      useScrollendEvent: false,\n      useAnimationFrameWithResizeObserver: false,\n      ...opts,\n    }\n  }\n\n  private notify = (sync: boolean) => {\n    this.options.onChange?.(this, sync)\n  }\n\n  private maybeNotify = memo(\n    () => {\n      this.calculateRange()\n\n      return [\n        this.isScrolling,\n        this.range ? this.range.startIndex : null,\n        this.range ? this.range.endIndex : null,\n      ]\n    },\n    (isScrolling) => {\n      this.notify(isScrolling)\n    },\n    {\n      key: process.env.NODE_ENV !== 'production' && 'maybeNotify',\n      debug: () => this.options.debug,\n      initialDeps: [\n        this.isScrolling,\n        this.range ? this.range.startIndex : null,\n        this.range ? this.range.endIndex : null,\n      ] as [boolean, number | null, number | null],\n    },\n  )\n\n  private cleanup = () => {\n    this.unsubs.filter(Boolean).forEach((d) => d!())\n    this.unsubs = []\n    this.observer.disconnect()\n    this.scrollElement = null\n    this.targetWindow = null\n  }\n\n  _didMount = () => {\n    return () => {\n      this.cleanup()\n    }\n  }\n\n  _willUpdate = () => {\n    const scrollElement = this.options.enabled\n      ? this.options.getScrollElement()\n      : null\n\n    if (this.scrollElement !== scrollElement) {\n      this.cleanup()\n\n      if (!scrollElement) {\n        this.maybeNotify()\n        return\n      }\n\n      this.scrollElement = scrollElement\n\n      if (this.scrollElement && 'ownerDocument' in this.scrollElement) {\n        this.targetWindow = this.scrollElement.ownerDocument.defaultView\n      } else {\n        this.targetWindow = this.scrollElement?.window ?? null\n      }\n\n      this.elementsCache.forEach((cached) => {\n        this.observer.observe(cached)\n      })\n\n      this._scrollToOffset(this.getScrollOffset(), {\n        adjustments: undefined,\n        behavior: undefined,\n      })\n\n      this.unsubs.push(\n        this.options.observeElementRect(this, (rect) => {\n          this.scrollRect = rect\n          this.maybeNotify()\n        }),\n      )\n\n      this.unsubs.push(\n        this.options.observeElementOffset(this, (offset, isScrolling) => {\n          this.scrollAdjustments = 0\n          this.scrollDirection = isScrolling\n            ? this.getScrollOffset() < offset\n              ? 'forward'\n              : 'backward'\n            : null\n          this.scrollOffset = offset\n          this.isScrolling = isScrolling\n\n          this.maybeNotify()\n        }),\n      )\n    }\n  }\n\n  private getSize = () => {\n    if (!this.options.enabled) {\n      this.scrollRect = null\n      return 0\n    }\n\n    this.scrollRect = this.scrollRect ?? this.options.initialRect\n\n    return this.scrollRect[this.options.horizontal ? 'width' : 'height']\n  }\n\n  private getScrollOffset = () => {\n    if (!this.options.enabled) {\n      this.scrollOffset = null\n      return 0\n    }\n\n    this.scrollOffset =\n      this.scrollOffset ??\n      (typeof this.options.initialOffset === 'function'\n        ? this.options.initialOffset()\n        : this.options.initialOffset)\n\n    return this.scrollOffset\n  }\n\n  private getFurthestMeasurement = (\n    measurements: Array<VirtualItem>,\n    index: number,\n  ) => {\n    const furthestMeasurementsFound = new Map<number, true>()\n    const furthestMeasurements = new Map<number, VirtualItem>()\n    for (let m = index - 1; m >= 0; m--) {\n      const measurement = measurements[m]!\n\n      if (furthestMeasurementsFound.has(measurement.lane)) {\n        continue\n      }\n\n      const previousFurthestMeasurement = furthestMeasurements.get(\n        measurement.lane,\n      )\n      if (\n        previousFurthestMeasurement == null ||\n        measurement.end > previousFurthestMeasurement.end\n      ) {\n        furthestMeasurements.set(measurement.lane, measurement)\n      } else if (measurement.end < previousFurthestMeasurement.end) {\n        furthestMeasurementsFound.set(measurement.lane, true)\n      }\n\n      if (furthestMeasurementsFound.size === this.options.lanes) {\n        break\n      }\n    }\n\n    return furthestMeasurements.size === this.options.lanes\n      ? Array.from(furthestMeasurements.values()).sort((a, b) => {\n          if (a.end === b.end) {\n            return a.index - b.index\n          }\n\n          return a.end - b.end\n        })[0]\n      : undefined\n  }\n\n  private getMeasurementOptions = memo(\n    () => [\n      this.options.count,\n      this.options.paddingStart,\n      this.options.scrollMargin,\n      this.options.getItemKey,\n      this.options.enabled,\n    ],\n    (count, paddingStart, scrollMargin, getItemKey, enabled) => {\n      this.pendingMeasuredCacheIndexes = []\n      return {\n        count,\n        paddingStart,\n        scrollMargin,\n        getItemKey,\n        enabled,\n      }\n    },\n    {\n      key: false,\n    },\n  )\n\n  private getMeasurements = memo(\n    () => [this.getMeasurementOptions(), this.itemSizeCache],\n    (\n      { count, paddingStart, scrollMargin, getItemKey, enabled },\n      itemSizeCache,\n    ) => {\n      if (!enabled) {\n        this.measurementsCache = []\n        this.itemSizeCache.clear()\n        return []\n      }\n\n      if (this.measurementsCache.length === 0) {\n        this.measurementsCache = this.options.initialMeasurementsCache\n        this.measurementsCache.forEach((item) => {\n          this.itemSizeCache.set(item.key, item.size)\n        })\n      }\n\n      const min =\n        this.pendingMeasuredCacheIndexes.length > 0\n          ? Math.min(...this.pendingMeasuredCacheIndexes)\n          : 0\n      this.pendingMeasuredCacheIndexes = []\n\n      const measurements = this.measurementsCache.slice(0, min)\n\n      for (let i = min; i < count; i++) {\n        const key = getItemKey(i)\n\n        const furthestMeasurement =\n          this.options.lanes === 1\n            ? measurements[i - 1]\n            : this.getFurthestMeasurement(measurements, i)\n\n        const start = furthestMeasurement\n          ? furthestMeasurement.end + this.options.gap\n          : paddingStart + scrollMargin\n\n        const measuredSize = itemSizeCache.get(key)\n        const size =\n          typeof measuredSize === 'number'\n            ? measuredSize\n            : this.options.estimateSize(i)\n\n        const end = start + size\n\n        const lane = furthestMeasurement\n          ? furthestMeasurement.lane\n          : i % this.options.lanes\n\n        measurements[i] = {\n          index: i,\n          start,\n          size,\n          end,\n          key,\n          lane,\n        }\n      }\n\n      this.measurementsCache = measurements\n\n      return measurements\n    },\n    {\n      key: process.env.NODE_ENV !== 'production' && 'getMeasurements',\n      debug: () => this.options.debug,\n    },\n  )\n\n  calculateRange = memo(\n    () => [\n      this.getMeasurements(),\n      this.getSize(),\n      this.getScrollOffset(),\n      this.options.lanes,\n    ],\n    (measurements, outerSize, scrollOffset, lanes) => {\n      return (this.range =\n        measurements.length > 0 && outerSize > 0\n          ? calculateRange({\n              measurements,\n              outerSize,\n              scrollOffset,\n              lanes,\n            })\n          : null)\n    },\n    {\n      key: process.env.NODE_ENV !== 'production' && 'calculateRange',\n      debug: () => this.options.debug,\n    },\n  )\n\n  getVirtualIndexes = memo(\n    () => {\n      let startIndex: number | null = null\n      let endIndex: number | null = null\n      const range = this.calculateRange()\n      if (range) {\n        startIndex = range.startIndex\n        endIndex = range.endIndex\n      }\n      this.maybeNotify.updateDeps([this.isScrolling, startIndex, endIndex])\n      return [\n        this.options.rangeExtractor,\n        this.options.overscan,\n        this.options.count,\n        startIndex,\n        endIndex,\n      ]\n    },\n    (rangeExtractor, overscan, count, startIndex, endIndex) => {\n      return startIndex === null || endIndex === null\n        ? []\n        : rangeExtractor({\n            startIndex,\n            endIndex,\n            overscan,\n            count,\n          })\n    },\n    {\n      key: process.env.NODE_ENV !== 'production' && 'getVirtualIndexes',\n      debug: () => this.options.debug,\n    },\n  )\n\n  indexFromElement = (node: TItemElement) => {\n    const attributeName = this.options.indexAttribute\n    const indexStr = node.getAttribute(attributeName)\n\n    if (!indexStr) {\n      console.warn(\n        `Missing attribute name '${attributeName}={index}' on measured element.`,\n      )\n      return -1\n    }\n\n    return parseInt(indexStr, 10)\n  }\n\n  private _measureElement = (\n    node: TItemElement,\n    entry: ResizeObserverEntry | undefined,\n  ) => {\n    const index = this.indexFromElement(node)\n    const item = this.measurementsCache[index]\n    if (!item) {\n      return\n    }\n    const key = item.key\n    const prevNode = this.elementsCache.get(key)\n\n    if (prevNode !== node) {\n      if (prevNode) {\n        this.observer.unobserve(prevNode)\n      }\n      this.observer.observe(node)\n      this.elementsCache.set(key, node)\n    }\n\n    if (node.isConnected) {\n      this.resizeItem(index, this.options.measureElement(node, entry, this))\n    }\n  }\n\n  resizeItem = (index: number, size: number) => {\n    const item = this.measurementsCache[index]\n    if (!item) {\n      return\n    }\n    const itemSize = this.itemSizeCache.get(item.key) ?? item.size\n    const delta = size - itemSize\n\n    if (delta !== 0) {\n      if (\n        this.shouldAdjustScrollPositionOnItemSizeChange !== undefined\n          ? this.shouldAdjustScrollPositionOnItemSizeChange(item, delta, this)\n          : item.start < this.getScrollOffset() + this.scrollAdjustments\n      ) {\n        if (process.env.NODE_ENV !== 'production' && this.options.debug) {\n          console.info('correction', delta)\n        }\n\n        this._scrollToOffset(this.getScrollOffset(), {\n          adjustments: (this.scrollAdjustments += delta),\n          behavior: undefined,\n        })\n      }\n\n      this.pendingMeasuredCacheIndexes.push(item.index)\n      this.itemSizeCache = new Map(this.itemSizeCache.set(item.key, size))\n\n      this.notify(false)\n    }\n  }\n\n  measureElement = (node: TItemElement | null | undefined) => {\n    if (!node) {\n      this.elementsCache.forEach((cached, key) => {\n        if (!cached.isConnected) {\n          this.observer.unobserve(cached)\n          this.elementsCache.delete(key)\n        }\n      })\n      return\n    }\n\n    this._measureElement(node, undefined)\n  }\n\n  getVirtualItems = memo(\n    () => [this.getVirtualIndexes(), this.getMeasurements()],\n    (indexes, measurements) => {\n      const virtualItems: Array<VirtualItem> = []\n\n      for (let k = 0, len = indexes.length; k < len; k++) {\n        const i = indexes[k]!\n        const measurement = measurements[i]!\n\n        virtualItems.push(measurement)\n      }\n\n      return virtualItems\n    },\n    {\n      key: process.env.NODE_ENV !== 'production' && 'getVirtualItems',\n      debug: () => this.options.debug,\n    },\n  )\n\n  getVirtualItemForOffset = (offset: number) => {\n    const measurements = this.getMeasurements()\n    if (measurements.length === 0) {\n      return undefined\n    }\n    return notUndefined(\n      measurements[\n        findNearestBinarySearch(\n          0,\n          measurements.length - 1,\n          (index: number) => notUndefined(measurements[index]).start,\n          offset,\n        )\n      ],\n    )\n  }\n\n  getOffsetForAlignment = (\n    toOffset: number,\n    align: ScrollAlignment,\n    itemSize = 0,\n  ) => {\n    const size = this.getSize()\n    const scrollOffset = this.getScrollOffset()\n\n    if (align === 'auto') {\n      align = toOffset >= scrollOffset + size ? 'end' : 'start'\n    }\n\n    if (align === 'center') {\n      // When aligning to a particular item (e.g. with scrollToIndex),\n      // adjust offset by the size of the item to center on the item\n      toOffset += (itemSize - size) / 2\n    } else if (align === 'end') {\n      toOffset -= size\n    }\n\n    const scrollSizeProp = this.options.horizontal\n      ? 'scrollWidth'\n      : 'scrollHeight'\n    const scrollSize = this.scrollElement\n      ? 'document' in this.scrollElement\n        ? this.scrollElement.document.documentElement[scrollSizeProp]\n        : this.scrollElement[scrollSizeProp]\n      : 0\n\n    const maxOffset = scrollSize - size\n\n    return Math.max(Math.min(maxOffset, toOffset), 0)\n  }\n\n  getOffsetForIndex = (index: number, align: ScrollAlignment = 'auto') => {\n    index = Math.max(0, Math.min(index, this.options.count - 1))\n\n    const item = this.measurementsCache[index]\n    if (!item) {\n      return undefined\n    }\n\n    const size = this.getSize()\n    const scrollOffset = this.getScrollOffset()\n\n    if (align === 'auto') {\n      if (item.end >= scrollOffset + size - this.options.scrollPaddingEnd) {\n        align = 'end'\n      } else if (item.start <= scrollOffset + this.options.scrollPaddingStart) {\n        align = 'start'\n      } else {\n        return [scrollOffset, align] as const\n      }\n    }\n\n    const toOffset =\n      align === 'end'\n        ? item.end + this.options.scrollPaddingEnd\n        : item.start - this.options.scrollPaddingStart\n\n    return [\n      this.getOffsetForAlignment(toOffset, align, item.size),\n      align,\n    ] as const\n  }\n\n  private isDynamicMode = () => this.elementsCache.size > 0\n\n  private cancelScrollToIndex = () => {\n    if (this.scrollToIndexTimeoutId !== null && this.targetWindow) {\n      this.targetWindow.clearTimeout(this.scrollToIndexTimeoutId)\n      this.scrollToIndexTimeoutId = null\n    }\n  }\n\n  scrollToOffset = (\n    toOffset: number,\n    { align = 'start', behavior }: ScrollToOffsetOptions = {},\n  ) => {\n    this.cancelScrollToIndex()\n\n    if (behavior === 'smooth' && this.isDynamicMode()) {\n      console.warn(\n        'The `smooth` scroll behavior is not fully supported with dynamic size.',\n      )\n    }\n\n    this._scrollToOffset(this.getOffsetForAlignment(toOffset, align), {\n      adjustments: undefined,\n      behavior,\n    })\n  }\n\n  scrollToIndex = (\n    index: number,\n    { align: initialAlign = 'auto', behavior }: ScrollToIndexOptions = {},\n  ) => {\n    index = Math.max(0, Math.min(index, this.options.count - 1))\n\n    this.cancelScrollToIndex()\n\n    if (behavior === 'smooth' && this.isDynamicMode()) {\n      console.warn(\n        'The `smooth` scroll behavior is not fully supported with dynamic size.',\n      )\n    }\n\n    const offsetAndAlign = this.getOffsetForIndex(index, initialAlign)\n    if (!offsetAndAlign) return\n\n    const [offset, align] = offsetAndAlign\n\n    this._scrollToOffset(offset, { adjustments: undefined, behavior })\n\n    if (behavior !== 'smooth' && this.isDynamicMode() && this.targetWindow) {\n      this.scrollToIndexTimeoutId = this.targetWindow.setTimeout(() => {\n        this.scrollToIndexTimeoutId = null\n\n        const elementInDOM = this.elementsCache.has(\n          this.options.getItemKey(index),\n        )\n\n        if (elementInDOM) {\n          const [latestOffset] = notUndefined(\n            this.getOffsetForIndex(index, align),\n          )\n\n          if (!approxEqual(latestOffset, this.getScrollOffset())) {\n            this.scrollToIndex(index, { align, behavior })\n          }\n        } else {\n          this.scrollToIndex(index, { align, behavior })\n        }\n      })\n    }\n  }\n\n  scrollBy = (delta: number, { behavior }: ScrollToOffsetOptions = {}) => {\n    this.cancelScrollToIndex()\n\n    if (behavior === 'smooth' && this.isDynamicMode()) {\n      console.warn(\n        'The `smooth` scroll behavior is not fully supported with dynamic size.',\n      )\n    }\n\n    this._scrollToOffset(this.getScrollOffset() + delta, {\n      adjustments: undefined,\n      behavior,\n    })\n  }\n\n  getTotalSize = () => {\n    const measurements = this.getMeasurements()\n\n    let end: number\n    // If there are no measurements, set the end to paddingStart\n    // If there is only one lane, use the last measurement's end\n    // Otherwise find the maximum end value among all measurements\n    if (measurements.length === 0) {\n      end = this.options.paddingStart\n    } else if (this.options.lanes === 1) {\n      end = measurements[measurements.length - 1]?.end ?? 0\n    } else {\n      const endByLane = Array<number | null>(this.options.lanes).fill(null)\n      let endIndex = measurements.length - 1\n      while (endIndex >= 0 && endByLane.some((val) => val === null)) {\n        const item = measurements[endIndex]!\n        if (endByLane[item.lane] === null) {\n          endByLane[item.lane] = item.end\n        }\n\n        endIndex--\n      }\n\n      end = Math.max(...endByLane.filter((val): val is number => val !== null))\n    }\n\n    return Math.max(\n      end - this.options.scrollMargin + this.options.paddingEnd,\n      0,\n    )\n  }\n\n  private _scrollToOffset = (\n    offset: number,\n    {\n      adjustments,\n      behavior,\n    }: {\n      adjustments: number | undefined\n      behavior: ScrollBehavior | undefined\n    },\n  ) => {\n    this.options.scrollToFn(offset, { behavior, adjustments }, this)\n  }\n\n  measure = () => {\n    this.itemSizeCache = new Map()\n    this.notify(false)\n  }\n}\n\nconst findNearestBinarySearch = (\n  low: number,\n  high: number,\n  getCurrentValue: (i: number) => number,\n  value: number,\n) => {\n  while (low <= high) {\n    const middle = ((low + high) / 2) | 0\n    const currentValue = getCurrentValue(middle)\n\n    if (currentValue < value) {\n      low = middle + 1\n    } else if (currentValue > value) {\n      high = middle - 1\n    } else {\n      return middle\n    }\n  }\n\n  if (low > 0) {\n    return low - 1\n  } else {\n    return 0\n  }\n}\n\nfunction calculateRange({\n  measurements,\n  outerSize,\n  scrollOffset,\n  lanes,\n}: {\n  measurements: Array<VirtualItem>\n  outerSize: number\n  scrollOffset: number\n  lanes: number\n}) {\n  const lastIndex = measurements.length - 1\n  const getOffset = (index: number) => measurements[index]!.start\n\n  // handle case when item count is less than or equal to lanes\n  if (measurements.length <= lanes) {\n    return {\n      startIndex: 0,\n      endIndex: lastIndex,\n    }\n  }\n\n  let startIndex = findNearestBinarySearch(\n    0,\n    lastIndex,\n    getOffset,\n    scrollOffset,\n  )\n  let endIndex = startIndex\n\n  if (lanes === 1) {\n    while (\n      endIndex < lastIndex &&\n      measurements[endIndex]!.end < scrollOffset + outerSize\n    ) {\n      endIndex++\n    }\n  } else if (lanes > 1) {\n    // Expand forward until we include the visible items from all lanes\n    // which are closer to the end of the virtualizer window\n    const endPerLane = Array(lanes).fill(0)\n    while (\n      endIndex < lastIndex &&\n      endPerLane.some((pos) => pos < scrollOffset + outerSize)\n    ) {\n      const item = measurements[endIndex]!\n      endPerLane[item.lane] = item.end\n      endIndex++\n    }\n\n    // Expand backward until we include all lanes' visible items\n    // closer to the top\n    const startPerLane = Array(lanes).fill(scrollOffset + outerSize)\n    while (startIndex >= 0 && startPerLane.some((pos) => pos >= scrollOffset)) {\n      const item = measurements[startIndex]!\n      startPerLane[item.lane] = item.start\n      startIndex--\n    }\n\n    // Align startIndex to the beginning of its lane\n    startIndex = Math.max(0, startIndex - (startIndex % lanes))\n    // Align endIndex to the end of its lane\n    endIndex = Math.min(lastIndex, endIndex + (lanes - 1 - (endIndex % lanes)))\n  }\n\n  return { startIndex, endIndex }\n}\n"],"file":"D:/speckle-server/packages/ui-components/node_modules/@tanstack/virtual-core/dist/esm/index.js","x_google_ignoreList":[0]}