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Add fallback option to forwarded state

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This commit is contained in:
Talia 2023-12-23 17:31:45 +01:00
parent cebd867bd2
commit e38d556531
Signed by: darkwiiplayer
GPG key ID: 7808674088232B3E
1 changed files with 6 additions and 4 deletions
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10
state.js
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@ -85,8 +85,8 @@ export class State extends EventTarget {
}
}
forward(property="value") {
return new ForwardState(this, property)
forward(property="value", fallback) {
return new ForwardState(this, property, fallback)
}
set(prop, value) {
@ -101,11 +101,13 @@ export class State extends EventTarget {
export class ForwardState extends EventTarget {
#backend
#property
#fallback
constructor(backend, property) {
constructor(backend, property, fallback) {
super()
this.#backend = backend
this.#property = property
this.#fallback = fallback
const ref = new WeakRef(this)
const abortController = new AbortController()
backend.addEventListener("change", event => {
@ -120,7 +122,7 @@ export class ForwardState extends EventTarget {
}, {signal: abortController.signal})
}
get value() { return this.#backend.proxy[this.#property] }
get value() { return this.#backend.proxy[this.#property] ?? this.#fallback }
set value(value) { this.#backend.proxy[this.#property] = value }
}