5 lines
2.5 KiB
JavaScript
5 lines
2.5 KiB
JavaScript
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// enquire.js v1.5.6 - Awesome Media Queries in JavaScript
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// Copyright (c) 2013 Nick Williams - http://wicky.nillia.ms/enquire.js
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// License: MIT (http://www.opensource.org/licenses/mit-license.php)
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window.enquire=function(e){"use strict";function t(e,t){var n=0,r=e.length,i;for(n;n<r;n++){i=t(e[n],n);if(i===!1)break}}function n(e){return Object.prototype.toString.apply(e)==="[object Array]"}function r(e){return typeof e=="function"}function i(e){this.initialised=!1,this.options=e,e.deferSetup||this.setup()}function s(e,t){this.query=e,this.isUnconditional=t,this.handlers=[],this.matched=!1}function o(){if(!e)throw new Error("matchMedia is required");var t=new s("only all");this.queries={},this.listening=!1,this.browserIsIncapable=!t.matchMedia()}return i.prototype={setup:function(e){this.options.setup&&this.options.setup(e),this.initialised=!0},on:function(e){this.initialised||this.setup(e),this.options.match(e)},off:function(e){this.options.unmatch&&this.options.unmatch(e)},destroy:function(){this.options.destroy?this.options.destroy():this.off()},equals:function(e){return this.options===e||this.options.match===e}},s.prototype={matchMedia:function(){return e(this.query).matches},addHandler:function(e,t){var n=new i(e);this.handlers.push(n),t&&this.matched&&n.on()},removeHandler:function(e){var n=this.handlers;t(n,function(t,r){if(t.equals(e))return t.destroy(),!n.splice(r,1)})},assess:function(e){this.matchMedia()||this.isUnconditional?this.match(e):this.unmatch(e)},match:function(e){if(this.matched)return;t(this.handlers,function(t){t.on(e)}),this.matched=!0},unmatch:function(e){if(!this.matched)return;t(this.handlers,function(t){t.off(e)}),this.matched=!1}},o.prototype={register:function(e,i,o){var u=this.queries,a=o&&this.browserIsIncapable,f=this.listening;return u.hasOwnProperty(e)||(u[e]=new s(e,a),this.listening&&u[e].assess()),r(i)&&(i={match:i}),n(i)||(i=[i]),t(i,function(t){u[e].addHandler(t,f)}),this},unregister:function(e,n){var r=this.queries;return r.hasOwnProperty(e)?(n?r[e].removeHandler(n):(t(this.queries[e].handlers,function(e){e.destroy()}),delete r[e]),this):this},fire:function(e){var t=this.queries,n;for(n in t)t.hasOwnProperty(n)&&t[n].assess(e);return this},listen:function(e){function n(n){var r;window.addEventListener(n,function(n){r&&clearTimeout(r),r=setTimeout(function(){t.fire(n)},e)},!1)}var t=this;return e=e||500,this.listening?this:(window.addEventListener&&(n("resize"),n("orientationChange")),t.fire(),this.listening=!0,this)}},new o}(window.matchMedia);
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