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from typing import Optional
from PyQt5.QtCore import QObject, pyqtSignal, pyqtProperty
from UM.TaskManagement.HttpRequestManager import HttpRequestManager
class ConnectionStatus(QObject):
"""Provides an estimation of whether internet is reachable
Estimation is updated with every request through HttpRequestManager.
Acts as a proxy to HttpRequestManager.internetReachableChanged without
exposing the HttpRequestManager in its entirety.
"""
__instance = None # type: Optional[ConnectionStatus]
internetReachableChanged = pyqtSignal()
@classmethod
def getInstance(cls, *args, **kwargs) -> "ConnectionStatus":
if cls.__instance is None:
cls.__instance = cls(*args, **kwargs)
return cls.__instance
def __init__(self, parent: Optional["QObject"] = None) -> None:
super().__init__(parent)
manager = HttpRequestManager.getInstance()
self._is_internet_reachable = manager.isInternetReachable # type: bool
manager.internetReachableChanged.connect(self._onInternetReachableChanged)
@pyqtProperty(bool, notify = internetReachableChanged)
def isInternetReachable(self) -> bool:
return self._is_internet_reachable
def _onInternetReachableChanged(self, reachable: bool):
if reachable != self._is_internet_reachable:
self._is_internet_reachable = reachable
self.internetReachableChanged.emit()
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