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Viewing file:     SectionManager.js (4.28 KB)      -rw-r--r--

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;

var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));

var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));

var _Section = _interopRequireDefault(require("./Section"));

var _types = require("./types");

/**
 * Window Sections are used to group nearby cells.
 * This enables us to more quickly determine which cells to display in a given region of the Window.
 * 
 */
var SECTION_SIZE = 100;

/**
 * Contains 0 to many Sections.
 * Grows (and adds Sections) dynamically as cells are registered.
 * Automatically adds cells to the appropriate Section(s).
 */
var SectionManager =
/*#__PURE__*/
function () {
  function SectionManager() {
    var sectionSize = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : SECTION_SIZE;
    (0, _classCallCheck2["default"])(this, SectionManager);
    this._sectionSize = sectionSize;
    this._cellMetadata = [];
    this._sections = {};
  }
  /**
   * Gets all cell indices contained in the specified region.
   * A region may encompass 1 or more Sections.
   */


  (0, _createClass2["default"])(SectionManager, [{
    key: "getCellIndices",
    value: function getCellIndices(_ref) {
      var height = _ref.height,
          width = _ref.width,
          x = _ref.x,
          y = _ref.y;
      var indices = {};
      this.getSections({
        height: height,
        width: width,
        x: x,
        y: y
      }).forEach(function (section) {
        return section.getCellIndices().forEach(function (index) {
          indices[index] = index;
        });
      }); // Object keys are strings; this function returns numbers

      return Object.keys(indices).map(function (index) {
        return indices[index];
      });
    }
    /** Get size and position information for the cell specified. */

  }, {
    key: "getCellMetadata",
    value: function getCellMetadata(_ref2) {
      var index = _ref2.index;
      return this._cellMetadata[index];
    }
    /** Get all Sections overlapping the specified region. */

  }, {
    key: "getSections",
    value: function getSections(_ref3) {
      var height = _ref3.height,
          width = _ref3.width,
          x = _ref3.x,
          y = _ref3.y;
      var sectionXStart = Math.floor(x / this._sectionSize);
      var sectionXStop = Math.floor((x + width - 1) / this._sectionSize);
      var sectionYStart = Math.floor(y / this._sectionSize);
      var sectionYStop = Math.floor((y + height - 1) / this._sectionSize);
      var sections = [];

      for (var sectionX = sectionXStart; sectionX <= sectionXStop; sectionX++) {
        for (var sectionY = sectionYStart; sectionY <= sectionYStop; sectionY++) {
          var key = "".concat(sectionX, ".").concat(sectionY);

          if (!this._sections[key]) {
            this._sections[key] = new _Section["default"]({
              height: this._sectionSize,
              width: this._sectionSize,
              x: sectionX * this._sectionSize,
              y: sectionY * this._sectionSize
            });
          }

          sections.push(this._sections[key]);
        }
      }

      return sections;
    }
    /** Total number of Sections based on the currently registered cells. */

  }, {
    key: "getTotalSectionCount",
    value: function getTotalSectionCount() {
      return Object.keys(this._sections).length;
    }
    /** Intended for debugger/test purposes only */

  }, {
    key: "toString",
    value: function toString() {
      var _this = this;

      return Object.keys(this._sections).map(function (index) {
        return _this._sections[index].toString();
      });
    }
    /** Adds a cell to the appropriate Sections and registers it metadata for later retrievable. */

  }, {
    key: "registerCell",
    value: function registerCell(_ref4) {
      var cellMetadatum = _ref4.cellMetadatum,
          index = _ref4.index;
      this._cellMetadata[index] = cellMetadatum;
      this.getSections(cellMetadatum).forEach(function (section) {
        return section.addCellIndex({
          index: index
        });
      });
    }
  }]);
  return SectionManager;
}();

exports["default"] = SectionManager;