forked from GNUsocial/gnu-social
505 lines
15 KiB
JavaScript
505 lines
15 KiB
JavaScript
// Auto-load scripts
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//
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// specify which map providers to load by using
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// <script src="mxn.js?(provider1,provider2,[module1,module2])" ...
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// in your HTML
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//
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// for each provider mxn.provider.module.js and mxn.module.js will be loaded
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// module 'core' is always loaded
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//
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// NOTE: if you call without providers
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// <script src="mxn.js" ...
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// no scripts will be loaded at all and it is then up to you to load the scripts independently
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(function() {
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var providers = null;
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var modules = 'core';
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var scriptBase;
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var scripts = document.getElementsByTagName('script');
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// Determine which scripts we need to load
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for (var i = 0; i < scripts.length; i++) {
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var match = scripts[i].src.replace(/%20/g , '').match(/^(.*?)mxn\.js(\?\(\[?(.*?)\]?\))?$/);
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if (match != null) {
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scriptBase = match[1];
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if (match[3]) {
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var settings = match[3].split(',[');
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providers = settings[0].replace(']' , '');
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if (settings[1]) modules += ',' + settings[1];
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}
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break;
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}
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}
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if (providers == null || providers == 'none') return; // Bail out if no auto-load has been found
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providers = providers.replace(/ /g, '').split(',');
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modules = modules.replace(/ /g, '').split(',');
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// Actually load the scripts
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for (i = 0; i < modules.length; i++) {
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document.write("<script type='text/javascript' src='" + scriptBase + 'mxn.' + modules[i] + '.js' + "'></script>");
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for (var j = 0; j < providers.length; j++) document.write("<script type='text/javascript' src='" + scriptBase + 'mxn.' + providers[j] + '.' + modules[i] + '.js' + "'></script>");
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}
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})();
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(function(){
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// holds all our implementing functions
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var apis = {};
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// Our special private methods
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/**
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* Calls the API specific implementation of a particular method.
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* @private
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*/
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var invoke = function(sApiId, sObjName, sFnName, oScope, args){
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if(!hasImplementation(sApiId, sObjName, sFnName)) {
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throw 'Method ' + sFnName + ' of object ' + sObjName + ' is not supported by API ' + sApiId + '. Are you missing a script tag?';
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}
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return apis[sApiId][sObjName][sFnName].apply(oScope, args);
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};
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/**
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* Determines whether the specified API provides an implementation for the
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* specified object and function name.
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* @private
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*/
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var hasImplementation = function(sApiId, sObjName, sFnName){
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if(typeof(apis[sApiId]) == 'undefined') {
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throw 'API ' + sApiId + ' not loaded. Are you missing a script tag?';
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}
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if(typeof(apis[sApiId][sObjName]) == 'undefined') {
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throw 'Object definition ' + sObjName + ' in API ' + sApiId + ' not loaded. Are you missing a script tag?';
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}
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return typeof(apis[sApiId][sObjName][sFnName]) == 'function';
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};
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/**
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* @name mxn
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* @namespace
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*/
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var mxn = window.mxn = /** @lends mxn */ {
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/**
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* Registers a set of provider specific implementation functions.
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* @function
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* @param {String} sApiId The API ID to register implementing functions for.
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* @param {Object} oApiImpl An object containing the API implementation.
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*/
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register: function(sApiId, oApiImpl){
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if(!apis.hasOwnProperty(sApiId)){
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apis[sApiId] = {};
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}
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mxn.util.merge(apis[sApiId], oApiImpl);
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},
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/**
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* Adds a list of named proxy methods to the prototype of a
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* specified constructor function.
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* @function
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* @param {Function} func Constructor function to add methods to
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* @param {Array} aryMethods Array of method names to create
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* @param {Boolean} bWithApiArg Optional. Whether the proxy methods will use an API argument
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*/
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addProxyMethods: function(func, aryMethods, bWithApiArg){
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for(var i = 0; i < aryMethods.length; i++) {
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var sMethodName = aryMethods[i];
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if(bWithApiArg){
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func.prototype[sMethodName] = new Function('return this.invoker.go(\'' + sMethodName + '\', arguments, { overrideApi: true } );');
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}
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else {
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func.prototype[sMethodName] = new Function('return this.invoker.go(\'' + sMethodName + '\', arguments);');
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}
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}
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},
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/*
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checkLoad: function(funcDetails){
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if(this.loaded[this.api] === false) {
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var scope = this;
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this.onload[this.api].push( function() { funcDetails.callee.apply(scope, funcDetails); } );
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return true;
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}
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return false;
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},
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*/
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/**
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* Bulk add some named events to an object.
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* @function
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* @param {Object} oEvtSrc The event source object.
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* @param {String[]} aEvtNames Event names to add.
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*/
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addEvents: function(oEvtSrc, aEvtNames){
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for(var i = 0; i < aEvtNames.length; i++){
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var sEvtName = aEvtNames[i];
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if(sEvtName in oEvtSrc){
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throw 'Event or method ' + sEvtName + ' already declared.';
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}
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oEvtSrc[sEvtName] = new mxn.Event(sEvtName, oEvtSrc);
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}
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}
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};
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/**
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* Instantiates a new Event
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* @constructor
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* @param {String} sEvtName The name of the event.
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* @param {Object} oEvtSource The source object of the event.
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*/
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mxn.Event = function(sEvtName, oEvtSource){
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var handlers = [];
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if(!sEvtName){
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throw 'Event name must be provided';
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}
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/**
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* Add a handler to the Event.
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* @param {Function} fn The handler function.
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* @param {Object} ctx The context of the handler function.
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*/
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this.addHandler = function(fn, ctx){
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handlers.push({context: ctx, handler: fn});
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};
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/**
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* Remove a handler from the Event.
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* @param {Function} fn The handler function.
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* @param {Object} ctx The context of the handler function.
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*/
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this.removeHandler = function(fn, ctx){
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for(var i = 0; i < handlers.length; i++){
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if(handlers[i].handler == fn && handlers[i].context == ctx){
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handlers.splice(i, 1);
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}
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}
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};
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/**
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* Remove all handlers from the Event.
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*/
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this.removeAllHandlers = function(){
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handlers = [];
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};
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/**
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* Fires the Event.
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* @param {Object} oEvtArgs Event arguments object to be passed to the handlers.
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*/
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this.fire = function(oEvtArgs){
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var args = [sEvtName, oEvtSource, oEvtArgs];
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for(var i = 0; i < handlers.length; i++){
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handlers[i].handler.apply(handlers[i].context, args);
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}
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};
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};
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/**
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* Creates a new Invoker, a class which helps with on-the-fly
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* invocation of the correct API methods.
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* @constructor
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* @param {Object} aobj The core object whose methods will make cals to go()
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* @param {String} asClassName The name of the Mapstraction class to be invoked, normally the same name as aobj's constructor function
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* @param {Function} afnApiIdGetter The function on object aobj which will return the active API ID
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*/
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mxn.Invoker = function(aobj, asClassName, afnApiIdGetter){
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var obj = aobj;
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var sClassName = asClassName;
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var fnApiIdGetter = afnApiIdGetter;
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var defOpts = {
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overrideApi: false, // {Boolean} API ID is overridden by value in first argument
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context: null, // {Object} Local vars can be passed from the body of the method to the API method within this object
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fallback: null // {Function} If an API implementation doesn't exist this function is run instead
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};
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/**
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* Invoke the API implementation of a specific method.
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* @param {String} sMethodName The method name to invoke
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* @param {Array} args Arguments to pass on
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* @param {Object} oOptions Optional. Extra options for invocation
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* @param {Boolean} oOptions.overrideApi When true the first argument is used as the API ID.
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* @param {Object} oOptions.context A context object for passing extra information on to the provider implementation.
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* @param {Function} oOptions.fallback A fallback function to run if the provider implementation is missing.
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*/
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this.go = function(sMethodName, args, oOptions){
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if(typeof(oOptions) == 'undefined'){
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oOptions = defOpts;
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}
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var sApiId = oOptions.overrideApi ? args[0] : fnApiIdGetter.apply(obj);
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if(typeof(sApiId) != 'string'){
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throw 'API ID not available.';
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}
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if(typeof(oOptions.context) != 'undefined' && oOptions.context !== null){
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// make sure args is an array
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args = Array.prototype.slice.apply(args);
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args.push(oOptions.context);
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}
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if(typeof(oOptions.fallback) == 'function' && !hasImplementation(sApiId, sClassName, sMethodName)){
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// we've got no implementation but have got a fallback function
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return oOptions.fallback.apply(obj, args);
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}
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else {
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return invoke(sApiId, sClassName, sMethodName, obj, args);
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}
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};
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};
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/**
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* @namespace
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*/
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mxn.util = {
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/**
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* Merges properties of one object into another recursively.
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* @param {Object} oRecv The object receiveing properties
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* @param {Object} oGive The object donating properties
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*/
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merge: function(oRecv, oGive){
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for (var sPropName in oGive){
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if (oGive.hasOwnProperty(sPropName)) {
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if(!oRecv.hasOwnProperty(sPropName)){
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oRecv[sPropName] = oGive[sPropName];
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}
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else {
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mxn.util.merge(oRecv[sPropName], oGive[sPropName]);
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}
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}
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}
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},
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/**
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* $m, the dollar function, elegantising getElementById()
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* @return An HTML element or array of HTML elements
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*/
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$m: function() {
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var elements = [];
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for (var i = 0; i < arguments.length; i++) {
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var element = arguments[i];
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if (typeof(element) == 'string') {
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element = document.getElementById(element);
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}
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if (arguments.length == 1) {
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return element;
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}
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elements.push(element);
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}
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return elements;
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},
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/**
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* loadScript is a JSON data fetcher
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* @param {String} src URL to JSON file
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* @param {Function} callback Callback function
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*/
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loadScript: function(src, callback) {
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var script = document.createElement('script');
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script.type = 'text/javascript';
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script.src = src;
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if (callback) {
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if(script.addEventListener){
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script.addEventListener('load', callback, true);
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}
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else if(script.attachEvent){
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var done = false;
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script.attachEvent("onreadystatechange",function(){
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if ( !done && document.readyState === "complete" ) {
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done = true;
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callback();
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}
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});
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}
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}
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var h = document.getElementsByTagName('head')[0];
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h.appendChild( script );
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return;
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},
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/**
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*
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* @param {Object} point
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* @param {Object} level
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*/
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convertLatLonXY_Yahoo: function(point, level) { //Mercator
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var size = 1 << (26 - level);
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var pixel_per_degree = size / 360.0;
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var pixel_per_radian = size / (2 * Math.PI);
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var origin = new YCoordPoint(size / 2 , size / 2);
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var answer = new YCoordPoint();
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answer.x = Math.floor(origin.x + point.lon * pixel_per_degree);
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var sin = Math.sin(point.lat * Math.PI / 180.0);
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answer.y = Math.floor(origin.y + 0.5 * Math.log((1 + sin) / (1 - sin)) * -pixel_per_radian);
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return answer;
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},
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/**
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* Load a stylesheet from a remote file.
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* @param {String} href URL to the CSS file
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*/
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loadStyle: function(href) {
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var link = document.createElement('link');
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link.type = 'text/css';
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link.rel = 'stylesheet';
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link.href = href;
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document.getElementsByTagName('head')[0].appendChild(link);
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return;
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},
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/**
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* getStyle provides cross-browser access to css
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* @param {Object} el HTML Element
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* @param {String} prop Style property name
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*/
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getStyle: function(el, prop) {
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var y;
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if (el.currentStyle) {
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y = el.currentStyle[prop];
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}
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else if (window.getComputedStyle) {
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y = window.getComputedStyle( el, '').getPropertyValue(prop);
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}
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return y;
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},
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/**
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* Convert longitude to metres
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* http://www.uwgb.edu/dutchs/UsefulData/UTMFormulas.HTM
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* "A degree of longitude at the equator is 111.2km... For other latitudes,
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* multiply by cos(lat)"
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* assumes the earth is a sphere but good enough for our purposes
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* @param {Float} lon
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* @param {Float} lat
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*/
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lonToMetres: function(lon, lat) {
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return lon * (111200 * Math.cos(lat * (Math.PI / 180)));
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},
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/**
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* Convert metres to longitude
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* @param {Object} m
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* @param {Object} lat
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*/
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metresToLon: function(m, lat) {
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return m / (111200 * Math.cos(lat * (Math.PI / 180)));
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},
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/**
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* Convert kilometres to miles
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* @param {Float} km
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* @returns {Float} miles
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*/
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KMToMiles: function(km) {
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return km / 1.609344;
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},
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/**
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* Convert miles to kilometres
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* @param {Float} miles
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* @returns {Float} km
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*/
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milesToKM: function(miles) {
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return miles * 1.609344;
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},
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// stuff to convert google zoom levels to/from degrees
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// assumes zoom 0 = 256 pixels = 360 degrees
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// zoom 1 = 256 pixels = 180 degrees
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// etc.
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/**
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*
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* @param {Object} pixels
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* @param {Object} zoom
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*/
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getDegreesFromGoogleZoomLevel: function(pixels, zoom) {
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return (360 * pixels) / (Math.pow(2, zoom + 8));
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},
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/**
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*
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* @param {Object} pixels
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* @param {Object} degrees
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*/
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getGoogleZoomLevelFromDegrees: function(pixels, degrees) {
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return mxn.util.logN((360 * pixels) / degrees, 2) - 8;
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},
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/**
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*
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* @param {Object} number
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* @param {Object} base
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*/
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logN: function(number, base) {
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return Math.log(number) / Math.log(base);
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},
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/**
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* Returns array of loaded provider apis
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* @returns {Array} providers
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*/
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getAvailableProviders : function () {
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var providers = [];
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for (var propertyName in apis){
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if (apis.hasOwnProperty(propertyName)) {
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providers.push(propertyName);
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}
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}
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return providers;
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}
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};
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/**
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* Class for converting between HTML and RGB integer color formats.
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* Accepts either a HTML color string argument or three integers for R, G and B.
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* @constructor
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*/
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mxn.util.Color = function() {
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if(arguments.length == 3) {
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this.red = arguments[0];
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this.green = arguments[1];
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this.blue = arguments[2];
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}
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else if(arguments.length == 1) {
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this.setHexColor(arguments[0]);
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}
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};
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mxn.util.Color.prototype.reHex = /^#?([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$/;
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/**
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* Set the color from the supplied HTML hex string.
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* @param {String} strHexColor A HTML hex color string e.g. '#00FF88'.
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*/
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mxn.util.Color.prototype.setHexColor = function(strHexColor) {
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var match = strHexColor.match(this.reHex);
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if(match) {
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strHexColor = match[1];
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}
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else {
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throw 'Invalid HEX color format, expected #000, 000, #000000 or 000000';
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}
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if(strHexColor.length == 3) {
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strHexColor = strHexColor.replace(/\w/g, function(str){return str.concat(str);});
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}
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this.red = parseInt(strHexColor.substr(0,2), 16);
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this.green = parseInt(strHexColor.substr(2,2), 16);
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this.blue = parseInt(strHexColor.substr(4,2), 16);
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};
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/**
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* Retrieve the color value as an HTML hex string.
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* @returns {String} Format '00FF88' - note no preceding #.
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*/
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mxn.util.Color.prototype.getHexColor = function() {
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var vals = [this.red.toString(16), this.green.toString(16), this.blue.toString(16)];
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for(var i = 0; i < vals.length; i++) {
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vals[i] = (vals[i].length == 1) ? '0' + vals[i] : vals[i];
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vals[i] = vals[i].toUpperCase();
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}
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return vals.join('');
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};
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})(); |