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a65bf9d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | /* ngraph.events @ anvaka/ngraph.events (BSD-3-Clause) © Andrei Kashcha. Vendored 0-CDN; ESM source wrapped as UMD global `ngraphEvents`. */
(function(root,factory){if(typeof module==='object'&&module.exports){module.exports=factory();}else if(typeof define==='function'&&define.amd){define([],factory);}else{root.ngraphEvents=factory();}}(typeof self!=='undefined'?self:this,function(){
function eventify(subject) {
validateSubject(subject);
const eventsStorage = createEventsStorage(subject);
subject.on = eventsStorage.on;
subject.off = eventsStorage.off;
subject.fire = eventsStorage.fire;
return subject;
}
function createEventsStorage(subject) {
// Store all event listeners to this hash. Key is event name, value is array
// of callback records.
//
// A callback record consists of callback function and its optional context:
// { 'eventName' => [{callback: function, ctx: object}] }
let registeredEvents = Object.create(null);
return {
on: function (eventName, callback, ctx) {
if (typeof callback !== 'function') {
throw new Error('callback is expected to be a function');
}
let handlers = registeredEvents[eventName];
if (!handlers) {
handlers = registeredEvents[eventName] = [];
}
handlers.push({ callback: callback, ctx: ctx });
return subject;
},
off: function (eventName, callback) {
const wantToRemoveAll = (typeof eventName === 'undefined');
if (wantToRemoveAll) {
// Killing old events storage should be enough in this case:
registeredEvents = Object.create(null);
return subject;
}
if (registeredEvents[eventName]) {
const deleteAllCallbacksForEvent = (typeof callback !== 'function');
if (deleteAllCallbacksForEvent) {
delete registeredEvents[eventName];
} else {
const callbacks = registeredEvents[eventName];
for (let i = 0; i < callbacks.length; ++i) {
if (callbacks[i].callback === callback) {
callbacks.splice(i, 1);
}
}
}
}
return subject;
},
fire: function (eventName) {
const callbacks = registeredEvents[eventName];
if (!callbacks) {
return subject;
}
let fireArguments;
if (arguments.length > 1) {
// copy all args after eventName
fireArguments = Array.prototype.slice.call(arguments, 1);
}
for (let i = 0; i < callbacks.length; ++i) {
const callbackInfo = callbacks[i];
callbackInfo.callback.apply(callbackInfo.ctx, fireArguments);
}
return subject;
}
};
}
function validateSubject(subject) {
if (!subject) {
throw new Error('Eventify cannot use falsy object as events subject');
}
const reservedWords = ['on', 'fire', 'off'];
for (let i = 0; i < reservedWords.length; ++i) {
if (subject.hasOwnProperty(reservedWords[i])) {
throw new Error("Subject cannot be eventified, since it already has property '" + reservedWords[i] + "'");
}
}
}
return eventify;
}));
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