[IPython-dev] IPython and Qt?!
hans_meine at gmx.net
Tue May 31 06:22:54 CDT 2005
I discovered IPython only recently. It's a real gem! :-)
We developed our own Qt Python-terminal, but actually I think I could become
more happy with concentrating on improving IPython instead. (Our GUI is quite
a mess internally..)
Our current solution actually runs the "internal" python interpreter in a
separate process; now I am curious whether we can reach the same goal with a
separate thread, too. I patch IPython/Shell.py to run a QApplication in a
separate thread, and my first experiments were quite successful.
Would you like to have a look at it and tell me whether there is a reason that
Qt was not yet supported?
One possible problem that I see is the following, quoted from
"In Qt, one thread is always the GUI or event thread. This is the thread that
creates a QApplication object and calls QApplication::exec(). This is also
the initial thread that calls main() at program start. This thread is the
only thread that is allowed to perform GUI operations, including generating
and receiving events from the window system. Qt does not support creating
QApplication and running the event loop (with QApplication::exec()) in a
secondary thread. You must create the QApplication object and call
QApplication::exec() from the main() function in your program.
"Threads that wish to display data in a widget cannot modify the widget
directly, so they must post an event to the widget using
QApplication::postEvent(). The event will be delivered later on by the GUI
Now I wonder whether the commands I type in the ipython shell are executed in
the right thread (the one running QApplication::exec(), resp. .exec_loop() in
python)? I did not yet run into problems, but of course there could be
timing problems that I have later?
Ciao, / /
/ / ANS
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