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from importlib import import_module
from itertools import product
from apscheduler.schedulers.base import BaseScheduler
for version, pkgname in product(range(6, 1, -1), ("PySide", "PyQt")):
try:
qtcore = import_module(pkgname + str(version) + ".QtCore")
except ImportError:
pass
else:
QTimer = qtcore.QTimer
break
else:
raise ImportError("QtScheduler requires either PySide/PyQt (v6 to v2) installed")
class QtScheduler(BaseScheduler):
"""A scheduler that runs in a Qt event loop."""
_timer = None
def shutdown(self, *args, **kwargs):
super().shutdown(*args, **kwargs)
self._stop_timer()
def _start_timer(self, wait_seconds):
self._stop_timer()
if wait_seconds is not None:
wait_time = min(int(wait_seconds * 1000), 2147483647)
self._timer = QTimer.singleShot(wait_time, self._process_jobs)
def _stop_timer(self):
if self._timer:
if self._timer.isActive():
self._timer.stop()
del self._timer
def wakeup(self):
self._start_timer(0)
def _process_jobs(self):
wait_seconds = super()._process_jobs()
self._start_timer(wait_seconds)
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