Peter Billam wrote:
> I've got this tkinter program which allows you to load a file with
> File/LoadFile or Ctrl-L or from the Alt-F menu, as usual. But I'd
> also like to be able to invoke it with:
> shellprompt> midimix x.mid
> and have it invoke its usual loadFile method on x.mid
> But with the top-level code:
>
> application = tkinter.Tk()
> window = MainWindow(application)
> if (len(sys.argv) > 1) and os.path.exists(sys.argv[1]):
> window.loadFile(sys.argv[1])
> application.mainloop()
>
> it crashes:
> File "./midimix", line 465, in loadFile
> space0.grid(row=grid_row,
> pady=round(0.5*(ymid[track_num]-ymid[track_num-1]))-50)
> File "/usr/local/lib/python3.0/tkinter/__init__.py",
> line 1845, in grid_configure
> + self._options(cnf, kw))
> _tkinter.TclError: bad pad value "-50": must be positive screen distance
>
> presumably because the window doesn't have dimensions before mainloop
> is entered. Can I force the window to be laid out before entering
> mainloop? Or can I invoke loadFile() after mainloop has started ?
The latter. Try
> application = tkinter.Tk()
> window = MainWindow(application)
> if (len(sys.argv) > 1) and os.path.exists(sys.argv[1]):
application.after_idle(window.loadFile, sys.argv[1])
> application.mainloop()
Peter
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