@difizen/mana-app
Version:
60 lines (59 loc) • 2.82 kB
JavaScript
;
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.TreeNavigationService = void 0;
var _manaSyringe = require("@difizen/mana-syringe");
var _dec, _class;
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a 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, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : String(i); }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
var TreeNavigationService = exports.TreeNavigationService = (_dec = (0, _manaSyringe.singleton)(), _dec(_class = /*#__PURE__*/function () {
function TreeNavigationService() {
_classCallCheck(this, TreeNavigationService);
this.index = -1;
this.nodes = [];
}
_createClass(TreeNavigationService, [{
key: "next",
get: function get() {
return this.nodes[this.index + 1];
}
}, {
key: "prev",
get: function get() {
return this.nodes[this.index - 1];
}
}, {
key: "advance",
value: function advance() {
var node = this.next;
if (node) {
this.index += 1;
return node;
}
return undefined;
}
}, {
key: "retreat",
value: function retreat() {
var node = this.prev;
if (node) {
this.index -= 1;
return node;
}
return undefined;
}
}, {
key: "push",
value: function push(node) {
this.nodes = this.nodes.slice(0, this.index + 1);
this.nodes.push(node);
this.index += 1;
}
}]);
return TreeNavigationService;
}()) || _class);