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from __future__ import absolute_import
from apscheduler.schedulers.base import BaseScheduler
try:
from PyQt5.QtCore import QObject, QTimer
except ImportError: # pragma: nocover
try:
from PyQt4.QtCore import QObject, QTimer
except ImportError:
try:
from PySide.QtCore import QObject, QTimer # flake8: noqa
except ImportError:
raise ImportError('QtScheduler requires either PyQt5, PyQt4 or PySide installed')
class QtScheduler(BaseScheduler):
"""A scheduler that runs in a Qt event loop."""
_timer = None
def start(self):
super(QtScheduler, self).start()
self._wakeup()
def shutdown(self, wait=True):
super(QtScheduler, self).shutdown(wait)
self._stop_timer()
def _start_timer(self, wait_seconds):
self._stop_timer()
if wait_seconds is not None:
self._timer = QTimer.singleShot(wait_seconds * 1000, 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(QtScheduler, self)._process_jobs()
self._start_timer(wait_seconds)
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