react-vir-tree/lib/state/TreeState.js

react-virtualized-tree React component

'use strict';

exports.__esModule = true;
exports.default = exports.validateState = exports.State = undefined;

var _class2, _temp;

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

var _getFlattenedTree = require('../selectors/getFlattenedTree');

var _nodes = require('../selectors/nodes');

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

var State = exports.State = function State(tree, flattenedTree) {
  _classCallCheck(this, State);

  this.flattenedTree = null;
  this.tree = null;

  this.tree = tree;
  this.flattenedTree = flattenedTree || (0, _getFlattenedTree.getFlattenedTreePaths)(tree);
};

var validateState = exports.validateState = function validateState(state) {
  if (!(state instanceof State)) {
    throw new Error('Expected a State instance but got ' + (typeof state === 'undefined' ? 'undefined' : _typeof(state)));
  }
};

/**
 * Immutable structure that represents the TreeState.
 */
var TreeState = (_temp = _class2 = function TreeState() {
  _classCallCheck(this, TreeState);
}, _class2.getNodeAt = function (state, index) {
  validateState(state);

  var rowPath = state.flattenedTree[index];

  if (!rowPath) {
    throw Error('Tried to get node at row "' + index + '" but got nothing, the tree are ' + state.flattenedTree.length + ' visible rows');
  }

  return (0, _nodes.getNodeFromPath)(rowPath, state.tree);
}, _class2.getNodeDeepness = function (state, index) {
  validateState(state);

  var rowPath = state.flattenedTree[index];

  if (!rowPath) {
    throw Error('Tried to get node at row "' + index + '" but got nothing, the tree are ' + state.flattenedTree.length + ' visible rows');
  }

  return rowPath.length - 1;
}, _class2.getNumberOfVisibleDescendants = function (state, index) {
  var _TreeState$getNodeAt = TreeState.getNodeAt(state, index),
      id = _TreeState$getNodeAt.id;

  var flattenedTree = state.flattenedTree;

  var i = void 0;

  for (i = index; i < flattenedTree.length; i++) {
    var path = flattenedTree[i];

    if (!path.some(function (p) {
      return p === id;
    })) {
      break;
    }
  }

  return Math.max(i - 1 - index, 0);
}, _class2.getTree = function (state) {
  validateState(state);

  return state.tree;
}, _class2.createFromTree = function (tree) {
  if (!tree) {
    throw Error('A falsy tree was supplied in tree creation');
  }

  if (!Array.isArray(tree)) {
    throw Error('An invalid tree was supplied in creation');
  }

  return new State(tree);
}, _temp);
exports.default = TreeState;