Signal pyside2, fix issue #1012

Author: tpaviot

src/Display/qtDisplay.py

@@ -27,10 +27,6 @@
 
 QtCore, QtGui, QtWidgets, QtOpenGL = get_qt_modules()
 
-# check if signal available, not available
-# on PySide
-HAVE_PYQT_SIGNAL = hasattr(QtCore, "pyqtSignal")
-
 logging.basicConfig(stream=sys.stdout, level=logging.DEBUG)
 log = logging.getLogger(__name__)
 
@@ -67,8 +63,13 @@ class qtViewer3d(qtBaseViewer):
 
     # emit signal when selection is changed
     # is a list of TopoDS_*
-    if HAVE_PYQT_SIGNAL:
+    HAVE_PYQT_SIGNAL = False
+    if hasattr(QtCore, "pyqtSignal"):  # PyQt
         sig_topods_selected = QtCore.pyqtSignal(list)
+        HAVE_PYQT_SIGNAL = True
+    elif hasattr(QtCore, "Signal"):  # PySide2
+        sig_topods_selected = QtCore.Signal(list)
+        HAVE_PYQT_SIGNAL = True
 
     def __init__(self, *kargs):
         qtBaseViewer.__init__(self, *kargs)
@@ -215,7 +216,8 @@ def mouseReleaseEvent(self, event):
                     # single select otherwise
                     self._display.Select(pt.x(), pt.y())
 
-                    if (self._display.selected_shapes is not None) and HAVE_PYQT_SIGNAL:
+                    if (self._display.selected_shapes is not None) and self.HAVE_PYQT_SIGNAL:
+
                         self.sig_topods_selected.emit(self._display.selected_shapes)
 
         elif event.button() == QtCore.Qt.RightButton: