@geoext/geoext/src/util/Version.js

GeoExt is Open Source and enables building desktop-like GIS applications through the web. It is a JavaScript framework that combines the GIS functionality of OpenLayers with the user interface savvy of the ExtJS library provided by Sencha.

/* Copyright (c) 2015-present The Open Source Geospatial Foundation
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
/**
 * A utility class for detecting if the OpenLayers version is 3.x.x or 4.x.x.
 *
 * @class GeoExt.util.Version
 */
Ext.define('GeoExt.util.Version', {
  statics: {
    /**
     * As OpenLayers itself doesn't has any version methods we check for
     * functionality that is only supported in ol3.
     * @return {boolean} true if ol version is 3.x.x false if 4.x.x
     */
    isOl3: function () {
      return !!(ol.animation && ol.Map.prototype.beforeRender);
    },

    /**
     * Determine if the loaded version of OpenLayers is v.4.x.x.
     * @return {boolean} true if ol version is 4.x.x false if 3.x.x
     */
    isOl4: function () {
      return !this.isOl3();
    },
  },
});