39 lines
915 B
JavaScript
39 lines
915 B
JavaScript
class Subscribable {
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constructor() {
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this.events = {
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addSelf: [],
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editSelf: [],
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removeSelf: [],
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changeSelf: []
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}
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this.eventDeps = {
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addSelf: ["changeSelf"],
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editSelf: ["changeSelf"],
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removeSelf: ["changeSelf"],
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changeSelf: []
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}
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}
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subscribe(event, callback) {
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if (this.events[event]) {
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this.events[event].push(callback)
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} else {
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throw new Error(`Cannot subscribe to non-existent event ${event}, available events are: ${Object.keys(this.events).join(", ")}`)
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}
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}
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unsubscribe(event, callback) {
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const index = this.events[event].indexOf(callback)
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if (index === -1) throw new Error(`Tried to remove a nonexisting subscription from event ${event}`)
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this.events[event].splice(index, 1)
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}
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broadcast(event, data) {
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this.eventDeps[event].concat(event).forEach(eventName => {
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this.events[eventName].forEach(f => f(event, data))
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})
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}
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}
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export {Subscribable}
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