Start/pause/restart buttons in notebook

[qti3e]

No description provided.

[piscisaureus]

Good idea -- do you have any implementation ideas?

[qti3e]

restart is easy to implement, we just need to replace the Iframe, but I'm not sure about my idea about pause/resume in browsers...

console.log("Hello world")
console.log("next line")

to:

let stopped = false;
let pending;
function stop() {
  stopped = true;
}
function resume() {
  stopped = false;
  pending.f();
  pending.promise.resolve();
}

function run(f) {
  const promise = createResolvable();
  if (stopped) {
    pending = { promise, f };
  } else {
    f();
    promise.resolve();
  }
  return promise;
}

(async () => {
  await run(() => console.log("Hello world");
  await run(() => console.log("next line"));
}) ();

---

Also we can do:

function run(code) {
  let pending;
  let paused = false;
  setTimeout(async () => {
    for (const f of code) {
      pending = createResolvable();
      if (!paused) pending.resolve();
      await pending();
      f();
    }
  });
  return {
    pause() {
      if (paused) return;
      paused = true;
    },
    resume() {
      paused = false;
      if (pending instanceof Promise) {
        pending.resolve();
      }
    }
  }
}
const c = run( [
() => console.log("Hello world"),
() => console.log("next line")
]);
// c.pause()
// c.resume()

[qti3e]

Forget about that : )
We can do it very simple for now, maybe we can pause/resume at cell level.