mock PySide6 on RTD, add __version_info__ and remove extra_requirements

.readthedocs.yml

@@ -17,6 +17,4 @@ python:
   install:
     - method: pip
       path: .
-      extra_requirements:
-        - PySide6
   system_packages: false

docs/conf.py

@@ -11,6 +11,93 @@
 on_rtd = os.getenv('READTHEDOCS') == 'True'
 if on_rtd:
     html_theme = 'default'
+
+    class QtWidgets(object):
+
+        class QWidget(object):
+            pass
+
+        class QAbstractButton(object):
+            pass
+
+        class QToolButton(object):
+            pass
+
+        class QDialog(object):
+            exec_ = None
+
+        class QTableWidget(object):
+            pass
+
+        class QTreeWidget(object):
+            pass
+
+        class QMainWindow(object):
+            pass
+
+        class QMenu(object):
+            pass
+
+        class QLineEdit(object):
+            Normal = 0
+
+        class QDoubleSpinBox(object):
+            pass
+
+        class QSpinBox(object):
+            pass
+
+        class QApplication(object):
+            exec_ = None
+
+    class QtCore(object):
+
+        __version__ = ''
+        __version_info__ = tuple()
+
+        class Qt(object):
+            KeepAspectRatio = 1
+
+        class QThread(object):
+            pass
+
+        class QObject(object):
+            pass
+
+        @staticmethod
+        def pyqtSignal(*args, **kwargs):
+            pass
+
+        @staticmethod
+        def pyqtSlot(*args, **kwargs):
+            pass
+
+        @staticmethod
+        def Signal(*args, **kwargs):
+            pass
+
+        @staticmethod
+        def Slot(*args, **kwargs):
+            pass
+
+    class QtGui(object):
+
+        class QValidator(object):
+            pass
+
+    class QtSvg(object):
+        pass
+
+    class PySide6(object):
+        __version__ = ''
+        __version_info__ = tuple()
+
+    sys.modules['PySide6'] = PySide6
+    sys.modules['PySide6.QtGui'] = QtGui
+    sys.modules['PySide6.QtCore'] = QtCore
+    sys.modules['PySide6.QtWidgets'] = QtWidgets
+    sys.modules['PySide6.QtSvg'] = QtSvg
+
 else:
     html_theme = 'sphinx_rtd_theme'