_ff-addon-snippet-macIdleTime.js

Cu.import('resource://gre/modules/ctypes.jsm');

const cg = ctypes.open('/System/Library/Frameworks/CoreGraphics.framework/CoreGraphics');

const CFTimeInterval = ctypes.double;
const CGEventSourceStateID = ctypes.uint32_t;
const CGEventType = ctypes.uint32_t;

const kCGEventSourceStateCombinedSessionState = 0;
const kCGAnyInputEventType = 0xFFFFFFFF;

const CGEventSourceSecondsSinceLastEventType = cg.declare("CGEventSourceSecondsSinceLastEventType", ctypes.default_abi, CFTimeInterval, CGEventSourceStateID, CGEventType);


function calculateIdleTime() {
  return CGEventSourceSecondsSinceLastEventType(kCGEventSourceStateCombinedSessionState, kCGAnyInputEventType);
}

console.log('calculateIdleTime:', calculateIdleTime());

setTimeout(() => {
  console.log('calculateIdleTime:', calculateIdleTime());

    cg.close();
}, 5000);