"Do not create a new QApplication" when embedding mayavi in QT?

Asked Nov 02 '17 at 01:37

Active Nov 02 '17 at 01:37

Viewed 61 times

In the official example of "embedding mayavi in QT" http://docs.enthought.com/mayavi/mayavi/auto/example_qt_embedding.html#example-qt-embedding, the main code says:

if __name__ == "__main__":
    # Don't create a new QApplication, it would unhook the Events
    # set by Traits on the existing QApplication. Simply use the
    # '.instance()' method to retrieve the existing one.
    app = QtGui.QApplication.instance()
    ...

I am confused by this. What is the "existing QApplication"? This is the first line of the actual code, there was no existing QApplication. Also, what are the "Events set by Traits on the existing QApplication"?

asked Nov 02 '17 at 01:37

Alex

Obviously mayavi/pyface creates its own `QApplication`. – ekhumoro Nov 02 '17 at 18:56
It is created at the import? – Alex Nov 02 '17 at 19:06
1

Well, in the linked example, it's hard to see how else it could happen ;-) – ekhumoro Nov 02 '17 at 19:13

"Do not create a new QApplication" when embedding mayavi in QT?

0 Answers0