So I have 2 windows - one is a Display for the VPython rendering and is actually constructed as a class derived from the VPython display object (native on Windows, GTK1 on linux) The other is a TK control panel.
The user can interact with either - pick and move points, for example, in the Display, or reveal or hide construction levels from the control Panel. So each must be in a loop, and the 2 windows need to be able to communicate with to each other as to any user action.
I don't understand what the loop is doing. It sounds like you are polling the panel for changes instead of using event callbacks and the GUI event loop.
Maybe you know this - normally in a GUI application you register callback handlers with the widgets in the gui. So when a field changes a handler function is called to do whatever you want. No explicit loop is needed.
You certainly should be able to create a GUI app with two panels that respond to user input without explicitly creating any threads.
HTH Kent
On Windows, in the Display class I create the Panel, sending the Display as one of the arguments, while saving a reference to the Panel as an attribute of the Display class. And start a thread that sets off the TK loop for the Panel. The Display now has a reference to the Panel set on its creation, and the Panel now has a reference to the Display, sent to it as an argument. And the communication is bi-directional, via these references.
Same tact on Linux produces an error something to the effect:
"Attempt to start TK instance from a separate appartment" (definitely spelled with 2 p's).
A search on this error message on python-list brings me to a post by Aahz, resident threading expert, asking why one would want to multi-thread a TK application. Implying, I think, that one can't.
I am not sure that I need to. Or mean to. But nonetheless I can't find an approach here that yields bi-directional messaging other than the one that works on Windows.
This is sounding both esoteric, and not well described. But I am not so much expecting as answer, as much as anyone's gut as to whether this is answerable, and whether my problem is in any way TK specific.
Thanks.
Art
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