app.MainLoop vs. Pending/Dispatch

wxPython Users
1

Hello all,

I have recently upgraded an application to wxPython 2.5.3.1 (ansi) and hit a large snag:

I need to interleave the wx event system with calls to another component's. I used to do this by replacing app.MainLoop() with:

while not app.isDone:
    while app.Pending(): app.Dispatch()
    othercomponent.doStuff()

But now this no longer works (in my app the window is created and the mouse works, but there is no keyboard input. In a simpler test app the window components never even become visible).

Is there still a method of avoiding MainLoop I can use?

Failing that, I have hacked out a workaround by calling MainLoop and then using wx.FutureCall with a 1ms timeout and a Restart() inside the callback - which then executes my other component. Is there a faster/better method I can use?

TIA for any help,

Mike

2

Mike,

I have my own hack-like controllable event loop for unittesting purposes. It
does not fit your need but can give (maybe) some ideas. Here is my function:

def loop( delay=0 ):
    app = wx.GetApp()
    if app is None:
        return
    if delay == 0:
        while True:
            wx.CallAfter( app.ExitMainLoop )
            app.MainLoop()
            if not app.Pending():
                break
    else:
        wx.FutureCall( delay, app.ExitMainLoop )
        app.MainLoop()

···

------------------------------

    Vladimir Ignatov,
    KMI Software

3

Thanks Vladimir,

I also just found this: http://cvs.wxwidgets.org/viewcvs.cgi/wxWidgets/wxPython/samples/mainloop/mainloop.py?rev=1.1&content-type=text/vnd.viewcvs-markup
(and ActiveState Community - Boosting coder and team productivity with ready-to-use open source languages and tools. from just two weeks ago...)

Anyway, so a cleanish solution is:

class MyApp(wx.App):
    def MainLoop(self):
        evtloop = wx.EventLoop()
        wx.EventLoop.SetActive(evtloop)

        while not self.done:
            while evtloop.Pending(): evtloop.Dispatch()
            myothercomponents.doStuff()
...
gui=MyApp()
gui.MainLoop()

best wishes

Mike

Vladimir Ignatov wrote:

···

Mike,

I have my own hack-like controllable event loop for unittesting purposes. It
does not fit your need but can give (maybe) some ideas. Here is my function:

def loop( delay=0 ):
   app = wx.GetApp()
   if app is None:
       return
   if delay == 0:
       while True:
           wx.CallAfter( app.ExitMainLoop )
           app.MainLoop()
           if not app.Pending():
               break
   else:
       wx.FutureCall( delay, app.ExitMainLoop )
       app.MainLoop()
------------------------------

   Vladimir Ignatov,
   KMI Software

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