Improve compatibility with unofficial releases before Cura 5.0

Some versions of Cura tried to use the system-installed PyQt6 when they should still be using PyQt5 (which can be installed in parallel)

Fixes #295

DiscoverOctoPrintAction.py

@@ -12,8 +12,12 @@
 from cura.MachineAction import MachineAction
 from cura.Settings.CuraStackBuilder import CuraStackBuilder
 
-USE_QT5 = False
 try:
+ from cura.ApplicationMetadata import CuraSDKVersion
+except ImportError: # Cura <= 3.6
+ CuraSDKVersion = "6.0.0"
+USE_QT5 = False
+if CuraSDKVersion >= "8.0.0":
  from PyQt6.QtCore import pyqtSignal, pyqtProperty, pyqtSlot, QUrl, QObject, QTimer
  from PyQt6.QtGui import QDesktopServices
  from PyQt6.QtNetwork import (
@@ -29,7 +33,7 @@
  QNetworkRequestAttributes = QNetworkRequest.Attribute
  QSslSocketPeerVerifyModes = QSslSocket.PeerVerifyMode
 
-except ImportError:
+else:
  from PyQt5.QtCore import pyqtSignal, pyqtProperty, pyqtSlot, QUrl, QObject, QTimer
  from PyQt5.QtGui import QDesktopServices
  from PyQt5.QtNetwork import (

NetworkMJPGImage.py

@@ -2,6 +2,10 @@
 # NetworkMJPGImage is released under the terms of the LGPLv3 or higher.
 
 try:
+ from cura.ApplicationMetadata import CuraSDKVersion
+except ImportError: # Cura <= 3.6
+ CuraSDKVersion = "6.0.0"
+if CuraSDKVersion >= "8.0.0":
  from PyQt6.QtCore import QUrl, pyqtProperty, pyqtSignal, pyqtSlot, QRect, QByteArray
  from PyQt6.QtGui import QImage, QPainter
  from PyQt6.QtQuick import QQuickPaintedItem
@@ -14,7 +18,7 @@
  )
  QNetworkRequestAttributes = QNetworkRequest.Attribute
  QSslSocketPeerVerifyModes = QSslSocket.PeerVerifyMode
-except ImportError:
+else:
  from PyQt5.QtCore import QUrl, pyqtProperty, pyqtSignal, pyqtSlot, QRect, QByteArray
  from PyQt5.QtGui import QImage, QPainter
  from PyQt5.QtQuick import QQuickPaintedItem

NetworkReplyTimeout.py

@@ -2,9 +2,13 @@
 # NetworkReplyTimeout is released under the terms of the AGPLv3 or higher.
 
 try:
+ from cura.ApplicationMetadata import CuraSDKVersion
+except ImportError: # Cura <= 3.6
+ CuraSDKVersion = "6.0.0"
+if CuraSDKVersion >= "8.0.0":
  from PyQt6.QtCore import QObject, QTimer
  from PyQt6.QtNetwork import QNetworkReply
-except ImportError:
+else:
  from PyQt5.QtCore import QObject, QTimer
  from PyQt5.QtNetwork import QNetworkReply
 

OctoPrintOutputDevice.py

@@ -34,8 +34,12 @@
 
 from cura.PrinterOutput.NetworkedPrinterOutputDevice import NetworkedPrinterOutputDevice
 
-USE_QT5 = False
 try:
+ from cura.ApplicationMetadata import CuraSDKVersion
+except ImportError: # Cura <= 3.6
+ CuraSDKVersion = "6.0.0"
+USE_QT5 = False
+if CuraSDKVersion >= "8.0.0":
  from PyQt6.QtNetwork import (
  QHttpPart,
  QNetworkRequest,
@@ -58,7 +62,7 @@
  QNetworkReplyNetworkErrors = QNetworkReply.NetworkError
  QSslSocketPeerVerifyModes = QSslSocket.PeerVerifyMode
 
-except ImportError:
+else:
  from PyQt5.QtNetwork import (
  QHttpPart,
  QNetworkRequest,

OctoPrintOutputDevicePlugin.py

@@ -11,8 +11,12 @@
 from UM.Settings.ContainerStack import ContainerStack
 
 try:
+ from cura.ApplicationMetadata import CuraSDKVersion
+except ImportError: # Cura <= 3.6
+ CuraSDKVersion = "6.0.0"
+if CuraSDKVersion >= "8.0.0":
  from PyQt6.QtCore import QTimer
-except ImportError:
+else:
  from PyQt5.QtCore import QTimer
 
 import time

UploadOptions.py

@@ -5,10 +5,14 @@
 from UM.Version import Version
 from UM.Util import parseBool
 
-USE_QT5 = False
 try:
+ from cura.ApplicationMetadata import CuraSDKVersion
+except ImportError: # Cura <= 3.6
+ CuraSDKVersion = "6.0.0"
+USE_QT5 = False
+if CuraSDKVersion >= "8.0.0":
  from PyQt6.QtCore import QObject, pyqtSignal, pyqtProperty, pyqtSlot
-except ImportError:
+else:
  from PyQt5.QtCore import QObject, pyqtSignal, pyqtProperty, pyqtSlot
  USE_QT5 = True
 

WebcamsModel.py

@@ -2,8 +2,12 @@
 # OctoPrintPlugin is released under the terms of the AGPLv3 or higher.
 
 try:
+ from cura.ApplicationMetadata import CuraSDKVersion
+except ImportError: # Cura <= 3.6
+ CuraSDKVersion = "6.0.0"
+if CuraSDKVersion >= "8.0.0":
  from PyQt6.QtCore import Qt
-except ImportError:
+else:
  from PyQt5.QtCore import Qt
 
 from UM.Qt.ListModel import ListModel

__init__.py

@@ -12,8 +12,12 @@
 from UM.Logger import Logger
 
 try:
+ from cura.ApplicationMetadata import CuraSDKVersion
+except ImportError: # Cura <= 3.6
+ CuraSDKVersion = "6.0.0"
+if CuraSDKVersion >= "8.0.0":
  from PyQt6.QtQml import qmlRegisterType
-except ImportError:
+else:
  from PyQt5.QtQml import qmlRegisterType
 
 def getMetaData():