itdominator
1447a68fb0
- Rename ControllerContext to ControllerMessageBus for clarity - Switch ControllerBase to use SingletonRaised - Replace MarkEventsMixin with MarkerManager for multi-cursor editing - Add populate_popup event support for source view context menus - Remove unused swap file events - Moved JSON prettify feature to plugin - Fix event name: "removed_file" -> "remove_file"
30 lines
623 B
Python
30 lines
623 B
Python
# Python imports
|
|
from typing import Type, TypeVar, Any
|
|
|
|
# Lib imports
|
|
|
|
# Application imports
|
|
|
|
|
|
|
|
class SingletonError(Exception):
|
|
pass
|
|
|
|
|
|
|
|
T = TypeVar('T', bound='SingletonRaised')
|
|
|
|
class SingletonRaised:
|
|
__instance = None
|
|
|
|
def __new__(cls: Type[T], *args: Any, **kwargs: Any) -> T:
|
|
if cls.__instance is not None:
|
|
raise SingletonError(f"'{cls.__name__}' is a Singleton. Cannot create a new instance...")
|
|
|
|
cls.__instance = super(SingletonRaised, cls).__new__(cls)
|
|
return cls.__instance
|
|
|
|
def __init__(self) -> None:
|
|
if self.__instance is not None:
|
|
return
|