48 lines
762 B
JavaScript
48 lines
762 B
JavaScript
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import {Subscribable} from "./Subscribable.js"
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class SubscribeValue extends Subscribable {
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constructor() {
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super()
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this.hasData = false
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this.data = null
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}
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exists() {
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return this.hasData
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}
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value() {
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if (this.hasData) return this.data
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else return null
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}
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set(data) {
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const exists = this.exists()
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this.data = data
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this.hasData = true
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if (exists) {
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this.broadcast("editSelf", this.data)
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} else {
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this.broadcast("addSelf", this.data)
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}
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return this
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}
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edit(f) {
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if (this.exists()) {
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f(this.data)
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this.set(this.data)
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} else {
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throw new Error("Tried to edit a SubscribeValue that had no value")
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}
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}
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delete() {
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this.hasData = false
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this.broadcast("removeSelf")
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return this
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}
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}
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export {SubscribeValue}
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