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from typing import Any, Optional, TypeVar, cast
from reactivex import abc, typing
from reactivex.disposable import (
CompositeDisposable,
Disposable,
SingleAssignmentDisposable,
)
from ..periodicscheduler import PeriodicScheduler
_TState = TypeVar("_TState")
class GtkScheduler(PeriodicScheduler):
"""A scheduler that schedules work via the GLib main loop
used in GTK+ applications.
See https://wiki.gnome.org/Projects/PyGObject
"""
def __init__(self, glib: Any) -> None:
"""Create a new GtkScheduler.
Args:
glib: The GLib module to use; typically, you would get this by
>>> import gi
>>> gi.require_version('Gtk', '3.0')
>>> from gi.repository import GLib
"""
super().__init__()
self._glib = glib
def _gtk_schedule(
self,
time: typing.AbsoluteOrRelativeTime,
action: typing.ScheduledSingleOrPeriodicAction[_TState],
state: Optional[_TState] = None,
periodic: bool = False,
) -> abc.DisposableBase:
msecs = max(0, int(self.to_seconds(time) * 1000.0))
sad = SingleAssignmentDisposable()
stopped = False
def timer_handler(_: Any) -> bool:
if stopped:
return False
nonlocal state
if periodic:
state = cast(typing.ScheduledPeriodicAction[_TState], action)(state)
else:
sad.disposable = self.invoke_action(
cast(typing.ScheduledAction[_TState], action), state=state
)
return periodic
self._glib.timeout_add(msecs, timer_handler, None)
def dispose() -> None:
nonlocal stopped
stopped = True
return CompositeDisposable(sad, Disposable(dispose))
def schedule(
self, action: typing.ScheduledAction[_TState], state: Optional[_TState] = None
) -> abc.DisposableBase:
"""Schedules an action to be executed.
Args:
action: Action to be executed.
state: [Optional] state to be given to the action function.
Returns:
The disposable object used to cancel the scheduled action
(best effort).
"""
return self._gtk_schedule(0.0, action, state)
def schedule_relative(
self,
duetime: typing.RelativeTime,
action: typing.ScheduledAction[_TState],
state: Optional[_TState] = None,
) -> abc.DisposableBase:
"""Schedules an action to be executed after duetime.
Args:
duetime: Relative time after which to execute the action.
action: Action to be executed.
state: [Optional] state to be given to the action function.
Returns:
The disposable object used to cancel the scheduled action
(best effort).
"""
return self._gtk_schedule(duetime, action, state=state)
def schedule_absolute(
self,
duetime: typing.AbsoluteTime,
action: typing.ScheduledAction[_TState],
state: Optional[_TState] = None,
) -> abc.DisposableBase:
"""Schedules an action to be executed at duetime.
Args:
duetime: Absolute time at which to execute the action.
action: Action to be executed.
state: [Optional] state to be given to the action function.
Returns:
The disposable object used to cancel the scheduled action
(best effort).
"""
duetime = self.to_datetime(duetime)
return self._gtk_schedule(duetime - self.now, action, state=state)
def schedule_periodic(
self,
period: typing.RelativeTime,
action: typing.ScheduledPeriodicAction[_TState],
state: Optional[_TState] = None,
) -> abc.DisposableBase:
"""Schedules a periodic piece of work to be executed in the loop.
Args:
period: Period in seconds for running the work repeatedly.
action: Action to be executed.
state: [Optional] state to be given to the action function.
Returns:
The disposable object used to cancel the scheduled action
(best effort).
"""
return self._gtk_schedule(period, action, state=state, periodic=True)
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