Re: Gnome "Quit" menu is like clicking a button in a wxPython modal dialog

On Sun, Dec 13, 2020 at 00:47, Dietmar Schwertberger 
<[email protected]> wrote:
> I don't find your video particularly helpful. A small code sample 
> plus observation would have been much more useful.
> 
> What is your actual problem? When you close a dialog via the system 
> menu or the close icon of the window decoration, the return value is 
> the same as if you hit Cancel or the Escape key.
> The return value of dlg.ShowModal() is identical to wx.ID_CANCEL in 
> these cases. The Cancel button has the Id wx.ID_CANCEL.

Ok, here's a trivial code example to illustrate my problem:

-----------------
import wx

app = wx.App()
ans = wx.MessageBox('Hello World', 'Info', wx.OK | wx.ICON_INFORMATION)
if ans == 4:
	print('User clicked OK or pressed ENTER.')
elif ans == 16:
	print('User pressed ESC.')
else:
	print('Whoops, I have no clue what happened.')
-----------------

My problem is that if the user chooses "Quit" from the menu at the top, 
the application will think that the user pressed the ESC button, which 
is not correct. Using a MessageBox in the context of a larger 
application, the "Quit" menu creates confusion: "Quit" is intended to 
quit the application, not to quit the MessageBox.


On Sat, Dec 12, 2020 at 17:51, Tim Roberts <[email protected]> wrote:

> Do you understand that’s NOT the “Gnome Shell” menu?  That’s 
> your application’s menu.

Oh... No, I was not aware of this. I did not write ANY code dealing 
with menus, so I didn't think that I had a menu somewhere in my 
application.

> All of this is in your application’s control.  What action do you 
> take when the Quit menu item is picked?

My application has what I call a "main" frame. This frame has an "exit" 
method, which is used to quit the application (as the user if he/she 
really wants to quit, and clean up things before exiting). I guess the 
"Quit" menu should trigger this method. In any case, I don't want the 
"Quit" menu to mess with with the MessageBoxes or anything else in my 
GUI.

How do I get a grip on the menu that Gnome gave to my application?
How can I change the "Quit" menu to NOT mess with anything of the GUI 
(except the exit method of my main window)?
How can I deal with this in a platform-independent way (so I don't have 
to write specific code for Gnome, MacOS, Windows, etc.)?
(I tried Google, but couldn't find anything useful. I guess I don't 
know what I am looking for...)

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