dlueth/qoopido.nucleus

/**
 * @use /demand/weakmap
 *
 * @require ../emitter
 *
 * @polyfill ../polyfill/window/matchmedia
 */

(function(global) {
    'use strict';

    function definition(Weakmap, Emitter, matchMedia) {
        var storage = new Weakmap;

        function ComponentSense(query) {
            var self = Emitter.call(this),
                mql  = matchMedia(query);

            storage.set(self, mql);

            mql.addListener(function() {
                self.emit(mql.matches === true ? 'match' : 'unmatch');
            });

            return self;
        }

        ComponentSense.prototype = {
            get matches() {
                var mql = storage.get(this);

                if(mql) {
                    return mql.matches;
                }
            }
        };

        return ComponentSense.extends(Emitter);
    }

    provide([ '/demand/weakmap', '../emitter', global.matchMedia || '../polyfill/window/matchmedia' ], definition);
}(this));