Addon Manager: Extract PySide QtCore interface

src/Mod/AddonManager/addonmanager_pyside_interface.py

@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+# ***************************************************************************
+# *                                                                         *
+# *   Copyright (c) 2022 FreeCAD Project Association                        *
+# *                                                                         *
+# *   This file is part of FreeCAD.                                         *
+# *                                                                         *
+# *   FreeCAD is free software: you can redistribute it and/or modify it    *
+# *   under the terms of the GNU Lesser General Public License as           *
+# *   published by the Free Software Foundation, either version 2.1 of the  *
+# *   License, or (at your option) any later version.                       *
+# *                                                                         *
+# *   FreeCAD is distributed in the hope that it will be useful, but        *
+# *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
+# *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
+# *   Lesser General Public License for more details.                       *
+# *                                                                         *
+# *   You should have received a copy of the GNU Lesser General Public      *
+# *   License along with FreeCAD. If not, see                               *
+# *   <https://www.gnu.org/licenses/>.                                      *
+# *                                                                         *
+# ***************************************************************************
+
+"""Wrap QtCore imports so that can be replaced when running outside of FreeCAD (e.g. for
+unit tests, etc. Only provides wrappers for the things commonly used by the Addon
+Manager."""
+
+try:
+    from PySide import QtCore
+    QObject = QtCore.QObject
+    Signal = QtCore.Signal
+
+    def is_interruption_requested() -> bool:
+        return QtCore.QThread.currentThread().isInterruptionRequested()
+
+except ImportError:
+    QObject = object
+
+    class Signal:
+        """A purely synchronous signal. emit() does not use queued slots so cannot be
+        used across threads."""
+
+        def __init__(self, *args):
+            self.expected_types = args
+            self.connections = []
+
+        def connect(self, func):
+            self.connections.append(func)
+
+        def disconnect(self, func):
+            if func in self.connections:
+                self.connections.remove(func)
+
+        def emit(self, *args):
+            for connection in self.connections:
+                connection(args)
+
+    def is_interruption_requested() -> bool:
+        return False