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DEV: Allow afterFramePaint to be used in tests (#27226)

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We need to register a waiter so that `settled()` will wait for `runAfterFramePaint()` callbacks to be run before proceeding.
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David Taylor 2024-05-28 13:09:46 +01:00 committed by GitHub
parent 30e963be03
commit 63b7b598cb
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1 changed files with 9 additions and 1 deletions
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10
app/assets/javascripts/discourse/app/lib/after-frame-paint.js
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@ -1,8 +1,13 @@
import { registerWaiter } from "@ember/test";
/** /**
* Runs `callback` shortly after the next browser Frame is produced. * Runs `callback` shortly after the next browser Frame is produced.
* ref: https://webperf.tips/tip/measuring-paint-time * ref: https://webperf.tips/tip/measuring-paint-time
*/ */
export default function runAfterFramePaint(callback) { export default function runAfterFramePaint(callback) {
let done = false;
registerWaiter(() => done);
// Queue a "before Render Steps" callback via requestAnimationFrame. // Queue a "before Render Steps" callback via requestAnimationFrame.
requestAnimationFrame(() => { requestAnimationFrame(() => {
// MessageChannel is one of the highest priority task queues // MessageChannel is one of the highest priority task queues
@ -10,7 +15,10 @@ export default function runAfterFramePaint(callback) {
const messageChannel = new MessageChannel(); const messageChannel = new MessageChannel();
// Setup the callback to run in a Task // Setup the callback to run in a Task
messageChannel.port1.onmessage = callback; messageChannel.port1.onmessage = () => {
done = true;
callback();
};
// Queue the Task on the Task Queue // Queue the Task on the Task Queue
messageChannel.port2.postMessage(undefined); messageChannel.port2.postMessage(undefined);