178 lines
5.4 KiB
Python
178 lines
5.4 KiB
Python
import logging
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from typing import Any, Optional, Set, TypeVar, cast
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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("Rx")
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class WxScheduler(PeriodicScheduler):
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"""A scheduler for a wxPython event loop."""
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def __init__(self, wx: Any) -> None:
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"""Create a new WxScheduler.
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Args:
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wx: The wx module to use; typically, you would get this by
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import wx
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"""
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super().__init__()
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self._wx = wx
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timer_class: Any = self._wx.Timer
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class Timer(timer_class):
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def __init__(self, callback: typing.Action) -> None:
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super().__init__() # type: ignore
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self.callback = callback
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def Notify(self) -> None:
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self.callback()
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self._timer_class = Timer
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self._timers: Set[Timer] = set()
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def cancel_all(self) -> None:
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"""Cancel all scheduled actions.
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Should be called when destroying wx controls to prevent
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accessing dead wx objects in actions that might be pending.
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"""
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for timer in self._timers:
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timer.Stop() # type: ignore
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def _wxtimer_schedule(
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self,
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time: typing.AbsoluteOrRelativeTime,
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action: typing.ScheduledSingleOrPeriodicAction[_TState],
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state: Optional[_TState] = None,
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periodic: bool = False,
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) -> abc.DisposableBase:
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scheduler = self
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sad = SingleAssignmentDisposable()
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def interval() -> None:
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nonlocal state
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if periodic:
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state = cast(typing.ScheduledPeriodicAction[_TState], action)(state)
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else:
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sad.disposable = cast(typing.ScheduledAction[_TState], action)(
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scheduler, state
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)
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msecs = max(1, int(self.to_seconds(time) * 1000.0)) # Must be non-zero
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log.debug("timeout wx: %s", msecs)
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timer = self._timer_class(interval)
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# A timer can only be used from the main thread
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if self._wx.IsMainThread():
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timer.Start(msecs, oneShot=not periodic) # type: ignore
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else:
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self._wx.CallAfter(timer.Start, msecs, oneShot=not periodic) # type: ignore
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self._timers.add(timer)
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def dispose() -> None:
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timer.Stop() # type: ignore
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self._timers.remove(timer)
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return CompositeDisposable(sad, Disposable(dispose))
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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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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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self._wx.CallAfter(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_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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return self._wxtimer_schedule(duetime, action, state=state)
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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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duetime = self.to_datetime(duetime)
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return self._wxtimer_schedule(duetime - self.now, 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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return self._wxtimer_schedule(period, action, state=state, periodic=True)
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