Main Koha release repository
https://koha-community.org
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
279 lines
8.6 KiB
279 lines
8.6 KiB
// enquire.js v2.0.1 - Awesome Media Queries in JavaScript
|
|
// Copyright (c) 2013 Nick Williams - http://wicky.nillia.ms/enquire.js
|
|
// License: MIT (http://www.opensource.org/licenses/mit-license.php)
|
|
|
|
;(function(global) {
|
|
|
|
'use strict';
|
|
|
|
var matchMedia = global.matchMedia;
|
|
/*jshint -W098 */
|
|
/**
|
|
* Helper function for iterating over a collection
|
|
*
|
|
* @param collection
|
|
* @param fn
|
|
*/
|
|
function each(collection, fn) {
|
|
var i = 0,
|
|
length = collection.length,
|
|
cont;
|
|
|
|
for(i; i < length; i++) {
|
|
cont = fn(collection[i], i);
|
|
if(cont === false) {
|
|
break; //allow early exit
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Helper function for determining whether target object is an array
|
|
*
|
|
* @param target the object under test
|
|
* @return {Boolean} true if array, false otherwise
|
|
*/
|
|
function isArray(target) {
|
|
return Object.prototype.toString.apply(target) === '[object Array]';
|
|
}
|
|
|
|
/**
|
|
* Helper function for determining whether target object is a function
|
|
*
|
|
* @param target the object under test
|
|
* @return {Boolean} true if function, false otherwise
|
|
*/
|
|
function isFunction(target) {
|
|
return typeof target === 'function';
|
|
}
|
|
|
|
/**
|
|
* Delegate to handle a media query being matched and unmatched.
|
|
*
|
|
* @param {object} options
|
|
* @param {function} options.match callback for when the media query is matched
|
|
* @param {function} [options.unmatch] callback for when the media query is unmatched
|
|
* @param {function} [options.setup] one-time callback triggered the first time a query is matched
|
|
* @param {boolean} [options.deferSetup=false] should the setup callback be run immediately, rather than first time query is matched?
|
|
* @constructor
|
|
*/
|
|
function QueryHandler(options) {
|
|
this.options = options;
|
|
!options.deferSetup && this.setup();
|
|
}
|
|
QueryHandler.prototype = {
|
|
|
|
/**
|
|
* coordinates setup of the handler
|
|
*
|
|
* @function
|
|
*/
|
|
setup : function() {
|
|
if(this.options.setup) {
|
|
this.options.setup();
|
|
}
|
|
this.initialised = true;
|
|
},
|
|
|
|
/**
|
|
* coordinates setup and triggering of the handler
|
|
*
|
|
* @function
|
|
*/
|
|
on : function() {
|
|
!this.initialised && this.setup();
|
|
this.options.match && this.options.match();
|
|
},
|
|
|
|
/**
|
|
* coordinates the unmatch event for the handler
|
|
*
|
|
* @function
|
|
*/
|
|
off : function() {
|
|
this.options.unmatch && this.options.unmatch();
|
|
},
|
|
|
|
/**
|
|
* called when a handler is to be destroyed.
|
|
* delegates to the destroy or unmatch callbacks, depending on availability.
|
|
*
|
|
* @function
|
|
*/
|
|
destroy : function() {
|
|
this.options.destroy ? this.options.destroy() : this.off();
|
|
},
|
|
|
|
/**
|
|
* determines equality by reference.
|
|
* if object is supplied compare options, if function, compare match callback
|
|
*
|
|
* @function
|
|
* @param {object || function} [target] the target for comparison
|
|
*/
|
|
equals : function(target) {
|
|
return this.options === target || this.options.match === target;
|
|
}
|
|
|
|
};
|
|
/**
|
|
* Represents a single media query, manages it's state and registered handlers for this query
|
|
*
|
|
* @constructor
|
|
* @param {string} query the media query string
|
|
* @param {boolean} [isUnconditional=false] whether the media query should run regardless of whether the conditions are met. Primarily for helping older browsers deal with mobile-first design
|
|
*/
|
|
function MediaQuery(query, isUnconditional) {
|
|
this.query = query;
|
|
this.isUnconditional = isUnconditional;
|
|
this.handlers = [];
|
|
this.mql = matchMedia(query);
|
|
|
|
var self = this;
|
|
this.listener = function(mql) {
|
|
self.mql = mql;
|
|
self.assess();
|
|
};
|
|
this.mql.addListener(this.listener);
|
|
}
|
|
MediaQuery.prototype = {
|
|
|
|
/**
|
|
* add a handler for this query, triggering if already active
|
|
*
|
|
* @param {object} handler
|
|
* @param {function} handler.match callback for when query is activated
|
|
* @param {function} [handler.unmatch] callback for when query is deactivated
|
|
* @param {function} [handler.setup] callback for immediate execution when a query handler is registered
|
|
* @param {boolean} [handler.deferSetup=false] should the setup callback be deferred until the first time the handler is matched?
|
|
*/
|
|
addHandler : function(handler) {
|
|
var qh = new QueryHandler(handler);
|
|
this.handlers.push(qh);
|
|
|
|
this.matches() && qh.on();
|
|
},
|
|
|
|
/**
|
|
* removes the given handler from the collection, and calls it's destroy methods
|
|
*
|
|
* @param {object || function} handler the handler to remove
|
|
*/
|
|
removeHandler : function(handler) {
|
|
var handlers = this.handlers;
|
|
each(handlers, function(h, i) {
|
|
if(h.equals(handler)) {
|
|
h.destroy();
|
|
return !handlers.splice(i,1); //remove from array and exit each early
|
|
}
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Determine whether the media query should be considered a match
|
|
*
|
|
* @return {Boolean} true if media query can be considered a match, false otherwise
|
|
*/
|
|
matches : function() {
|
|
return this.mql.matches || this.isUnconditional;
|
|
},
|
|
|
|
/**
|
|
* Clears all handlers and unbinds events
|
|
*/
|
|
clear : function() {
|
|
each(this.handlers, function(handler) {
|
|
handler.destroy();
|
|
});
|
|
this.mql.removeListener(this.listener);
|
|
this.handlers.length = 0; //clear array
|
|
},
|
|
|
|
/*
|
|
* Assesses the query, turning on all handlers if it matches, turning them off if it doesn't match
|
|
*/
|
|
assess : function() {
|
|
var action = this.matches() ? 'on' : 'off';
|
|
|
|
each(this.handlers, function(handler) {
|
|
handler[action]();
|
|
});
|
|
}
|
|
};
|
|
/**
|
|
* Allows for registration of query handlers.
|
|
* Manages the query handler's state and is responsible for wiring up browser events
|
|
*
|
|
* @constructor
|
|
*/
|
|
function MediaQueryDispatch () {
|
|
if(!matchMedia) {
|
|
throw new Error('matchMedia not present, legacy browsers require a polyfill');
|
|
}
|
|
|
|
this.queries = {};
|
|
this.browserIsIncapable = !matchMedia('only all').matches;
|
|
}
|
|
|
|
MediaQueryDispatch.prototype = {
|
|
|
|
/**
|
|
* 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) {
|
|
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;
|
|
}
|
|
};
|
|
|
|
|
|
global.enquire = global.enquire || new MediaQueryDispatch();
|
|
|
|
}(this));
|