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Plug-ins communicating between themselves are not solved by this solution.
Code Block | ||||||
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| ||||||
export class EventBus implements EventTarget {
private _eventListeners: Map<string, EventListenerOrEventListenerObject[]>;
constructor() {
this._eventListeners = new Map<string, EventListenerOrEventListenerObject[]>();
}
addEventListener(type: string, callback: EventListenerOrEventListenerObject): void {
if (!this._eventListeners.has(type)) {
this._eventListeners.set(type, []);
}
this._eventListeners.get(type)!.push(callback);
}
dispatchEvent(event: Event): boolean {
if (this._eventListeners.has(event.type)) {
this._eventListeners
.get(event.type)
!.forEach((cb) =>
typeof cb === 'function' ? cb(event) : cb.handleEvent(event)
);
return true;
}
return false;
}
removeEventListener(type: string, callback: EventListenerOrEventListenerObject): void {
if (this._eventListeners.has(type)) {
this._eventListeners.set(type, this._eventListeners.get(type)!.filter((cb) => cb !== callback));
}
}
}
``` |
Alternatives
Instead of the central EventBus, we can let plugins dispatch events on the plugin itself. If a plugin needs an event from another plugin, It can listen to an event being dispatched to Open-SCD Core
.
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