blob: 1dc4ca2f7eb97d2e38424af5cf11336b44c3010f (
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class EventEmitter {
constructor() {
this.listeners = {};
}
emit(event) {
if (!(event in this.listeners)) {
return;
}
this.listeners[event].forEach(function(listener) {
listener.apply(this, arguments);
}.bind(this));
}
addListener(event, f) {
this.listeners[event] = this.listeners[event] || [];
this.listeners[event].push(f);
}
removeListener(event, f) {
if (!(event in this.listeners)) {
return false;
}
var index = this.listeners[event].indexOf(f);
if (index >= 0) {
this.listeners[event].splice(index, 1);
}
}
}
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