react-infinite-cursor/build/computers/constantInfiniteComputer.js

A browser-ready efficient scrolling container based on UITableView. Takes a cursor for rendering.

'use strict';

var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();

var _get = function get(_x, _x2, _x3) { var _again = true; _function: while (_again) { var object = _x, property = _x2, receiver = _x3; _again = false; if (object === null) object = Function.prototype; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { _x = parent; _x2 = property; _x3 = receiver; _again = true; desc = parent = undefined; continue _function; } } else if ('value' in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } } };

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }

function _inherits(subClass, superClass) { if (typeof superClass !== 'function' && superClass !== null) { throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

var InfiniteComputer = require('./infiniteComputer.js');

var ConstantInfiniteComputer = (function (_InfiniteComputer) {
  _inherits(ConstantInfiniteComputer, _InfiniteComputer);

  function ConstantInfiniteComputer() {
    _classCallCheck(this, ConstantInfiniteComputer);

    _get(Object.getPrototypeOf(ConstantInfiniteComputer.prototype), 'constructor', this).apply(this, arguments);
  }

  _createClass(ConstantInfiniteComputer, [{
    key: 'getTotalScrollableHeight',
    value: function getTotalScrollableHeight() {
      return this.heightData * this.numberOfChildren;
    }
  }, {
    key: 'getDisplayIndexStart',
    value: function getDisplayIndexStart(windowTop) {
      return Math.floor(windowTop / this.heightData);
    }
  }, {
    key: 'getDisplayIndexEnd',
    value: function getDisplayIndexEnd(windowBottom) {
      var nonZeroIndex = Math.ceil(windowBottom / this.heightData);
      if (nonZeroIndex > 0) {
        return nonZeroIndex - 1;
      }
      return nonZeroIndex;
    }
  }, {
    key: 'getTopSpacerHeight',
    value: function getTopSpacerHeight(displayIndexStart) {
      return displayIndexStart * this.heightData;
    }
  }, {
    key: 'getBottomSpacerHeight',
    value: function getBottomSpacerHeight(displayIndexEnd) {
      var nonZeroIndex = displayIndexEnd + 1;
      return Math.max(0, (this.numberOfChildren - nonZeroIndex) * this.heightData);
    }
  }]);

  return ConstantInfiniteComputer;
})(InfiniteComputer);

module.exports = ConstantInfiniteComputer;