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