IPython and matplotlib devs, Over the weekend I have been playing around to see if it is possible to do interactive GUI work with wx from IPython *without using threads*. The idea here is to use PyOS_InputHook. Currently, recent versions of PyQt4 and PyGTK do this and if we can get wx working, we can probably get rid of IPython's subtle threaded shells that currently allow interactive GUIs to work.
I am attaching a Cython module that mostly works. Here is a simple example that works in IPython (without the -wthread option!) In [1]: import pyximport In [2]: pyximport.install() In [3]: import inputhook In [4]: inputhook.set_input_hook() In [5]: import wx In [6]: app = wx.PySimpleApp() In [7]: app.MainLoop() In [8]: f = wx.Frame(None,-1,"Look mom, no threads!") In [9]: f.Show() Out[9]: True The docstring of the module also has a matplotlib example. This really does work and I am pretty sure it will also work in plain vanilla python as well. There are a few issues to work out: * When frame are closed by clicking the red button or the "X", the Windows don't close. In addition, in matplotlib, this causes further problems. * In the current matplotlib backend wx.Yield() is called in a way that is not safe as far as protecting against recursive calls to Yield. I think it should be called in this way: app = wx.GetApp() if app is not None: app.Yield(True) * I don't think that interupts work yet, but I haven't tested this thoroughly yet. I don't have any more time to work on this right now, but I at least wanted to share my findings with both IPython and matplotlib devs. It would be great if someone familiar with wx could try to figure out the remaining issues. If there are no takers here, I might eventually see if wxpython itself is interested in this code (that is probably where it really belongs anyway). Cheers, Brian
#include <Python.h>
static PyThreadState *event_tstate = NULL;
static void set_input_hook_c(int (*f)(void))
{
event_tstate = PyThreadState_Get();
PyOS_InputHook = f;
}
static void clear_input_hook_c(void)
{
PyOS_InputHook = NULL;
}
inputhook.pyx
Description: Binary data
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