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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
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| import traceback | ||
| import threading | ||
| from typing import Type, Callable | ||
|
|
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| from .utils import * | ||
|
|
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| __all__ = [ | ||
| 'Event', 'EventEmitter', | ||
| ] | ||
|
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| class Event: | ||
| __slots__ = ('_cancelable', '_canceled', '_request_unregist') | ||
|
|
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| def __init__(self, *, cancelable: bool = False): | ||
| self._cancelable = cancelable | ||
| self._canceled = False | ||
| self._request_unregist = False | ||
|
|
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| @property | ||
| def cancelable(self) -> bool: | ||
| return self._cancelable | ||
|
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| @property | ||
| def canceled(self) -> bool: | ||
| return self._canceled | ||
|
|
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| def cancel(self) -> None: | ||
| if self.cancelable: | ||
| self._canceled = True | ||
|
|
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| def unregister(self) -> None: | ||
| self._request_unregist = True | ||
|
|
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| def _on_before_callback(self) -> None: | ||
| pass | ||
|
|
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| class Listener[T: Event]: | ||
| __slots__ = ('callback', 'priority') | ||
|
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| def __init__(self, callback: Callable[[T], None], priority: int | None = None): | ||
| if priority is None: | ||
| priority = 1000 | ||
| self.callback = callback | ||
| self.priority = priority | ||
|
|
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| def insert_event_listener[T: Event](listener: Listener[T], lst: list[Listener[T]]) -> int: | ||
| if len(lst) == 0: | ||
| lst.append(listener) | ||
| return 0 | ||
| l, r = 0, len(lst) - 1 | ||
| m: int = 0 | ||
| while l <= r: | ||
| m = (l + r) // 2 | ||
| o = lst[m].priority | ||
| if o == listener.priority: | ||
| if m + 1 == len(lst) or lst[m + 1] != listener.priority: | ||
| lst.insert(m + 1, listener) | ||
| return m + 1 | ||
| if o > listener.priority: | ||
| r = m - 1 | ||
| else: | ||
| l = m + 1 | ||
| if lst[m].priority >= listener.priority: | ||
| lst.insert(m + 1, listener) | ||
| return m + 1 | ||
| lst.insert(m, listener) | ||
| return m | ||
|
|
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| class EventEmitter[T: Event]: | ||
| def __init__(self) -> None: | ||
| self._listeners: dict[int, list[Listener[T]]] = {} | ||
|
|
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| def emit(self, event_id: int, event: T) -> None: | ||
| listeners = self._listeners.get(event_id, []) | ||
| for i, l in list(enumerate(listeners)): | ||
| event._request_unregist = False | ||
| event._on_before_callback() | ||
| l.callback(event) | ||
| if event._request_unregist: | ||
| listeners.remove(l) | ||
| if event.cancelable and event.canceled: | ||
| break | ||
|
|
||
| def register(self, event_id: int, callback: Callable[[T], None], priority: int | None = None) -> None: | ||
| l = Listener(callback, priority) | ||
| if event_id not in self._listeners: | ||
| self._listeners[event_id] = [] | ||
| insert_event_listener(l, self._listeners[event_id]) | ||
| debug(f'Registered listener {callback} (priority={l.priority}) for {event_id}') | ||
|
|
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| def unregister(self, event_id: int, callback: Callable[[T], None] | None = None) -> bool: | ||
| if event_id not in self._listeners: | ||
| return False | ||
| if callback is None: | ||
| return len(self._listeners.pop(event_id)) > 0 | ||
| listeners = self._listeners[event_id] | ||
| for i, l in enumerate(listeners): | ||
| if l.callback == callback: | ||
| listeners.pop(i) | ||
| return True | ||
| return False |
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