99 lines
2.9 KiB
Python
99 lines
2.9 KiB
Python
from typing import Any, Optional, 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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class TkinterScheduler(PeriodicScheduler):
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"""A scheduler that schedules work via the Tkinter main event loop.
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http://infohost.nmt.edu/tcc/help/pubs/tkinter/web/universal.html
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http://effbot.org/tkinterbook/widget.htm"""
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def __init__(self, root: Any) -> None:
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"""Create a new TkinterScheduler.
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Args:
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root: The Tk instance to use; typically, you would get this by
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import tkinter; tkinter.Tk()
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"""
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super().__init__()
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self._root = root
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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)
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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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sad = SingleAssignmentDisposable()
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def invoke_action() -> None:
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sad.disposable = self.invoke_action(action, state=state)
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msecs = max(0, int(self.to_seconds(duetime) * 1000.0))
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timer = self._root.after(msecs, invoke_action)
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def dispose() -> None:
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self._root.after_cancel(timer)
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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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duetime = self.to_datetime(duetime)
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return self.schedule_relative(duetime - self.now, action, state=state)
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