input-onmessage.js

Enable keyboard shortcuts

// Responds to onmessage events from other frames to check for pending input.

onmessage = async e => {

  if (e.data !== 'check-input') return;

  const discreteOptions = { includeContinuous: false };

  const continuousOptions = { includeContinuous: true };

  // Use a reasonable time to wait after dispatching events, since we want to be

  // able to test for cases where isInputPending returns false.

  const DISPATCH_WAIT_TIME_MS = 500;

  // Wait a reasonable amount of time for the event to be enqueued.

  const end = performance.now() + DISPATCH_WAIT_TIME_MS;

  let hasDiscrete;

  let hasContinuous;

  do {

    hasDiscrete = navigator.scheduling.isInputPending(discreteOptions);

    hasContinuous = navigator.scheduling.isInputPending(continuousOptions);

  } while (performance.now() < end && !(hasDiscrete && hasContinuous));

  e.source.postMessage({

    discrete: hasDiscrete,

    continuous: hasContinuous,

  }, '*');