qt4 interface does not refresh until the script finishes

[Anton Gladky]

./examples/regular-sphere-pack.py is working normally, only when string 104 is commented.

http://bazaar.launchpad.net/%7Eyade-dev/yade/trunk/annotate/head%3A/examples/regular-sphere-pack/regular-sphere-pack.py#L104

When it is uncommented, the script should start automatically, but in this case Controller hangs and View window does not appear.

[Chiara Modenese (chiara-modenese)]

Hi Anton, this is a result of how qt4/ipython handle the "interaction loop" (technical term in the GUI programming, not InteractionLoop that we have in simulations) for processing user input. For now, there is no solution for that, one has to make sure the script finishes before the ui is usable. A way to do that is by using PyRunner with appropriate callback functions etc. I think that it will be solved with ipython 0.11, but I have to ask on their mailing list.

[Václav Šmilauer (eudoxos)]

Workaround: make script finish early, which can be done by wrapping all functionality that is supposed to be executed after the initialization in functions and call them from PyRunner engines based on conditions you define.

This bug will not be resolved until we switch to ipython>0.10, because it is caused by the way it executes the gui loop.

[Anton Gladky (gladky-anton)]

The problem is resolved by changing:

O.run(10000,True) => O.run(10000)
http://bazaar.launchpad.net/~yade-dev/yade/trunk/view/head:/examples/packs/packs.py#L138

So, the wait() function causes a freeze.
http://bazaar.launchpad.net/~yade-dev/yade/trunk/view/head:/py/wrapper/yadeWrapper.cpp#L360

I am not sure is it correct solution or not.

[Bruno Chareyre (bruno-chareyre)]

It is a feature, not a bug, to me seems. Closing.