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Editing File: /home/ubuntu/todaykat-frontend-base/node_modules/enquire.js/src/MediaQueryDispatch.js

var MediaQuery = require('./MediaQuery');
var Util = require('./Util');
var each = Util.each;
var isFunction = Util.isFunction;
var isArray = Util.isArray;

/**
 * Allows for registration of query handlers.
 * Manages the query handler's state and is responsible for wiring up browser events
 *
 * @constructor
 */
function MediaQueryDispatch () {
    if(!window.matchMedia) {
        throw new Error('matchMedia not present, legacy browsers require a polyfill');
    }

this.queries = {};
    this.browserIsIncapable = !window.matchMedia('only all').matches;
}

MediaQueryDispatch.prototype = {

constructor : MediaQueryDispatch,

/**
     * Registers a handler for the given media query
     *
     * @param {string} q the media query
     * @param {object || Array || Function} options either a single query handler object, a function, or an array of query handlers
     * @param {function} options.match fired when query matched
     * @param {function} [options.unmatch] fired when a query is no longer matched
     * @param {function} [options.setup] fired when handler first triggered
     * @param {boolean} [options.deferSetup=false] whether setup should be run immediately or deferred until query is first matched
     * @param {boolean} [shouldDegrade=false] whether this particular media query should always run on incapable browsers
     */
    register : function(q, options, shouldDegrade) {
        var queries         = this.queries,
            isUnconditional = shouldDegrade && this.browserIsIncapable;

if(!queries[q]) {
            queries[q] = new MediaQuery(q, isUnconditional);
        }

//normalise to object in an array
        if(isFunction(options)) {
            options = { match : options };
        }
        if(!isArray(options)) {
            options = [options];
        }
        each(options, function(handler) {
            if (isFunction(handler)) {
                handler = { match : handler };
            }
            queries[q].addHandler(handler);
        });

return this;
    },

/**
     * unregisters a query and all it's handlers, or a specific handler for a query
     *
     * @param {string} q the media query to target
     * @param {object || function} [handler] specific handler to unregister
     */
    unregister : function(q, handler) {
        var query = this.queries[q];

if(query) {
            if(handler) {
                query.removeHandler(handler);
            }
            else {
                query.clear();
                delete this.queries[q];
            }
        }

return this;
    }
};

module.exports = MediaQueryDispatch;

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