Initial Commit

lib/apscheduler/schedulers/qt.py

@@ -0,0 +1,46 @@
+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)