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joplin/packages/lib/EventDispatcher.js
2020-11-05 16:58:23 +00:00

34 lines
664 B
JavaScript

class EventDispatcher {
constructor() {
this.listeners_ = [];
}
dispatch(eventName, event = null) {
if (!this.listeners_[eventName]) return;
const ls = this.listeners_[eventName];
for (let i = 0; i < ls.length; i++) {
ls[i](event);
}
}
on(eventName, callback) {
if (!this.listeners_[eventName]) this.listeners_[eventName] = [];
this.listeners_[eventName].push(callback);
}
off(eventName, callback) {
if (!this.listeners_[eventName]) return;
const ls = this.listeners_[eventName];
for (let i = 0; i < ls.length; i++) {
if (ls[i] === callback) {
ls.splice(i, 1);
return;
}
}
}
}
module.exports = EventDispatcher;