Merge pull request #13731 from anntzer/qt-check-qapp

jklymak · web-flow · commit 24e4bea22533 · 2019-03-25T06:22:38.000-07:00
Check for already running QApplication in Qt embedding example.
diff --git a/examples/user_interfaces/embedding_in_qt_sgskip.py b/examples/user_interfaces/embedding_in_qt_sgskip.py
@@ -58,7 +58,12 @@ def _update_canvas(self):
 
 
 if __name__ == "__main__":
-    qapp = QtWidgets.QApplication(sys.argv)
+    # Check whether there is already a running QApplication (e.g., if running
+    # from an IDE).
+    qapp = QtWidgets.QApplication.instance()
+    if not qapp:
+        qapp = QtWidgets.QApplication(sys.argv)
+
     app = ApplicationWindow()
     app.show()
     qapp.exec_()
