running
is true
, continue invoking Window.requestAnimationFrame()
which invokes the provided callback.start
and stop
to allow manual control of the recording.autoStart
, to implicitly call start
when the function is invoked.const recordAnimationFrames = (callback, autoStart = true) => {
let running = false,
raf;
const stop = () => {
if (!running) return;
running = false;
cancelAnimationFrame(raf);
};
const start = () => {
if (running) return;
running = true;
run();
};
const run = () => {
raf = requestAnimationFrame(() => {
callback();
if (running) run();
});
};
if (autoStart) start();
return { start, stop };
};
const cb = () => console.log('Animation frame fired');
const recorder = recordAnimationFrames(cb);
// logs 'Animation frame fired' on each animation frame
recorder.stop(); // stops logging
recorder.start(); // starts again
const recorder2 = recordAnimationFrames(cb, false);
// `start` needs to be explicitly called to begin recording frames
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