144 lines
4.4 KiB
Python
144 lines
4.4 KiB
Python
import logging
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from datetime import timedelta
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from typing import Any, Optional, Set, TypeVar
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from reactivex import abc, typing
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from reactivex.disposable import (
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CompositeDisposable,
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Disposable,
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SingleAssignmentDisposable,
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)
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from ..periodicscheduler import PeriodicScheduler
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_TState = TypeVar("_TState")
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log = logging.getLogger(__name__)
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class QtScheduler(PeriodicScheduler):
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"""A scheduler for a PyQt5/PySide2 event loop."""
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def __init__(self, qtcore: Any):
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"""Create a new QtScheduler.
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Args:
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qtcore: The QtCore instance to use; typically you would get this by
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either import PyQt5.QtCore or import PySide2.QtCore
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"""
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super().__init__()
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self._qtcore = qtcore
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self._periodic_timers: Set[Any] = set()
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def schedule(
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self, action: typing.ScheduledAction[_TState], state: Optional[_TState] = None
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) -> abc.DisposableBase:
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"""Schedules an action to be executed.
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Args:
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action: Action to be executed.
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state: [Optional] state to be given to the action function.
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Returns:
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The disposable object used to cancel the scheduled action
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(best effort).
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"""
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return self.schedule_relative(0.0, action, state=state)
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def schedule_relative(
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self,
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duetime: typing.RelativeTime,
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action: typing.ScheduledAction[_TState],
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state: Optional[_TState] = None,
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) -> abc.DisposableBase:
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"""Schedules an action to be executed after duetime.
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Args:
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duetime: Relative time after which to execute the action.
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action: Action to be executed.
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state: [Optional] state to be given to the action function.
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Returns:
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The disposable object used to cancel the scheduled action
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(best effort).
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"""
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msecs = max(0, int(self.to_seconds(duetime) * 1000.0))
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sad = SingleAssignmentDisposable()
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is_disposed = False
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def invoke_action() -> None:
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if not is_disposed:
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sad.disposable = action(self, state)
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log.debug("relative timeout: %sms", msecs)
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# Use static method, let Qt C++ handle QTimer lifetime
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self._qtcore.QTimer.singleShot(msecs, invoke_action)
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def dispose() -> None:
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nonlocal is_disposed
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is_disposed = True
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return CompositeDisposable(sad, Disposable(dispose))
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def schedule_absolute(
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self,
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duetime: typing.AbsoluteTime,
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action: typing.ScheduledAction[_TState],
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state: Optional[_TState] = None,
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) -> abc.DisposableBase:
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"""Schedules an action to be executed at duetime.
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Args:
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duetime: Absolute time at which to execute the action.
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action: Action to be executed.
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state: [Optional] state to be given to the action function.
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Returns:
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The disposable object used to cancel the scheduled action
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(best effort).
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"""
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delta: timedelta = self.to_datetime(duetime) - self.now
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return self.schedule_relative(delta, action, state=state)
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def schedule_periodic(
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self,
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period: typing.RelativeTime,
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action: typing.ScheduledPeriodicAction[_TState],
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state: Optional[_TState] = None,
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) -> abc.DisposableBase:
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"""Schedules a periodic piece of work to be executed in the loop.
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Args:
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period: Period in seconds for running the work repeatedly.
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action: Action to be executed.
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state: [Optional] state to be given to the action function.
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Returns:
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The disposable object used to cancel the scheduled action
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(best effort).
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"""
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msecs = max(0, int(self.to_seconds(period) * 1000.0))
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sad = SingleAssignmentDisposable()
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def interval() -> None:
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nonlocal state
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state = action(state)
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log.debug("periodic timeout: %sms", msecs)
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timer = self._qtcore.QTimer()
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timer.setSingleShot(not period)
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timer.timeout.connect(interval)
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timer.setInterval(msecs)
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self._periodic_timers.add(timer)
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timer.start()
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def dispose() -> None:
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timer.stop()
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self._periodic_timers.remove(timer)
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timer.deleteLater()
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return CompositeDisposable(sad, Disposable(dispose))
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