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Add support for repeated callbacks to listener

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It is now possible to attach several callbacks to the same prop on a
single listener object.
This commit is contained in:
Talia 2021-09-13 19:21:00 +02:00
parent 7a061b10d5
commit a303a83ad7
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GPG key ID: AD727AD22802D0D6
1 changed files with 11 additions and 7 deletions
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18
listener.js
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@ -8,20 +8,24 @@ Example:
l.contract = new Contract()
*/
export const listener = (target={}) => {
export default (target={}) => {
let callbacks = new Map()
function listen(prop, callback) {
if ("object" == typeof prop && "forEach" in prop)
if ("object" == typeof prop && "forEach" in prop) {
prop.forEach(prop => this.listen(prop, callback))
else if (callback)
callbacks.set(prop, callback)
else
} else if (callback) {
let list = callbacks.get(prop)
if (!list) callbacks.set(prop, list=[])
list.push(callback)
} else {
callbacks.delete(prop)
}
}
let proxy = new Proxy(target, {
set: (target, prop, value) => {
if (callbacks.has("*")) callbacks.get("*")(value, prop)
if (callbacks.has(prop)) callbacks.get(prop)(value, prop)
console.log(callbacks)
if (callbacks.has("*")) callbacks.get("*").forEach(callback => callback(value, prop))
if (callbacks.has(prop)) callbacks.get(prop).forEach(callback => callback(value, prop))
return Reflect.set(target, prop, value)
},
get: (target, prop, value) => {