@tamagui/react-native-web-lite/dist/cjs/vendor/react-native/VirtualizedList/CellRenderMask.cjs

React Native for Web

var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all) __defProp(target, name, {
    get: all[name],
    enumerable: true
  });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from)) if (!__hasOwnProp.call(to, key) && key !== except) __defProp(to, key, {
      get: () => from[key],
      enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable
    });
  }
  return to;
};
var __toCommonJS = mod => __copyProps(__defProp({}, "__esModule", {
  value: true
}), mod);
var CellRenderMask_exports = {};
__export(CellRenderMask_exports, {
  CellRenderMask: () => CellRenderMask
});
module.exports = __toCommonJS(CellRenderMask_exports);
var import_react_native_web_internals = require("@tamagui/react-native-web-internals");
class CellRenderMask {
  constructor(numCells) {
    (0, import_react_native_web_internals.invariant)(numCells >= 0, "CellRenderMask must contain a non-negative number os cells");
    this._numCells = numCells;
    if (numCells === 0) {
      this._regions = [];
    } else {
      this._regions = [{
        first: 0,
        last: numCells - 1,
        isSpacer: true
      }];
    }
  }
  enumerateRegions() {
    return this._regions;
  }
  addCells(cells) {
    (0, import_react_native_web_internals.invariant)(cells.first >= 0 && cells.first < this._numCells && cells.last >= -1 && cells.last < this._numCells && cells.last >= cells.first - 1, "CellRenderMask.addCells called with invalid cell range");
    if (cells.last < cells.first) {
      return;
    }
    const [firstIntersect, firstIntersectIdx] = this._findRegion(cells.first);
    const [lastIntersect, lastIntersectIdx] = this._findRegion(cells.last);
    if (firstIntersectIdx === lastIntersectIdx && !firstIntersect.isSpacer) {
      return;
    }
    const newLeadRegion = [];
    const newTailRegion = [];
    const newMainRegion = {
      ...cells,
      isSpacer: false
    };
    if (firstIntersect.first < newMainRegion.first) {
      if (firstIntersect.isSpacer) {
        newLeadRegion.push({
          first: firstIntersect.first,
          last: newMainRegion.first - 1,
          isSpacer: true
        });
      } else {
        newMainRegion.first = firstIntersect.first;
      }
    }
    if (lastIntersect.last > newMainRegion.last) {
      if (lastIntersect.isSpacer) {
        newTailRegion.push({
          first: newMainRegion.last + 1,
          last: lastIntersect.last,
          isSpacer: true
        });
      } else {
        newMainRegion.last = lastIntersect.last;
      }
    }
    const replacementRegions = [...newLeadRegion, newMainRegion, ...newTailRegion];
    const numRegionsToDelete = lastIntersectIdx - firstIntersectIdx + 1;
    this._regions.splice(firstIntersectIdx, numRegionsToDelete, ...replacementRegions);
  }
  numCells() {
    return this._numCells;
  }
  equals(other) {
    return this._numCells === other._numCells && this._regions.length === other._regions.length && this._regions.every((region, i) => region.first === other._regions[i].first && region.last === other._regions[i].last && region.isSpacer === other._regions[i].isSpacer);
  }
  _findRegion(cellIdx) {
    let firstIdx = 0;
    let lastIdx = this._regions.length - 1;
    while (firstIdx <= lastIdx) {
      const middleIdx = Math.floor((firstIdx + lastIdx) / 2);
      const middleRegion = this._regions[middleIdx];
      if (cellIdx >= middleRegion.first && cellIdx <= middleRegion.last) {
        return [middleRegion, middleIdx];
      } else if (cellIdx < middleRegion.first) {
        lastIdx = middleIdx - 1;
      } else if (cellIdx > middleRegion.last) {
        firstIdx = middleIdx + 1;
      }
    }
    (0, import_react_native_web_internals.invariant)(false, `A region was not found containing cellIdx ${cellIdx}`);
  }
}