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fix: simplify MutationSensitiveArray listener system

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shirakaba
2022-12-17 22:46:07 +09:00
parent 95f9c44441
commit 217cd78114
2 changed files with 9 additions and 29 deletions
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11
packages/core/data/dom-events/dom-event.ts
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@@ -353,16 +353,17 @@ export class DOMEvent implements Event {
// Set a listener to clone the array just before any mutations.
let listenersLazyCopy: ListenerEntry[] = listenersLive;
const doLazyCopy = () => {
listenersLive.onMutation = () => (mutation: string, payload?: unknown) => {
console.log(`handleEvent "${data.eventName}": doLazyCopy due to "${mutation}"`, payload);
// Cloning the array via spread syntax is up to 180 nanoseconds
// faster per run than using Array.prototype.slice().
listenersLazyCopy = [...listenersLive];
listenersLive.onMutation = null;
};
listenersLive.once(doLazyCopy);
// Make sure we remove the listener before we exit the function,
// otherwise we may wastefully clone the array.
const cleanup = () => listenersLive.removeListener(doLazyCopy);
// Make sure we clear the callback before we exit the function,
// otherwise we may wastefully clone the array on future mutations.
const cleanup = () => (listenersLive.onMutation = null);
for (let i = listenersLazyCopy.length - 1; i >= 0; i--) {
const listener = listenersLazyCopy[i];