From nulla.epistola at web.de  Tue Jul 21 11:34:55 2020
From: nulla.epistola at web.de (Sibylle Koczian)
Date: Tue, 21 Jul 2020 17:34:55 +0200
Subject: [Tkinter-discuss] Force tkinter to use another fixed font
Message-ID: <e3507b29-8532-8f89-283a-5b5021986bba@web.de>

Background: with the last update my Arch Linux installation changed its 
standard monospace font to Inconsolata. I like this font, it works well 
in all my applications with one exception: in tkinter scripts all text 
using monospace is rendered like this:

t h i s   l o o k s   b a d .

This seems to be a rather complicated sort of bug, not located in Tcl/Tk 
or tkinter itself, as far as I could find out. So for the time being I'd 
like to change the font in tkinter scripts - but not by styling every 
single widget class I use. I tried two things: styling ttk.Widget and 
reconfiguring TkFixedfont.

In case it's important: Python version is 3.8.3.

Results: defining a style for ttk.Widget doesn't change anything:

import tkinter as tk
from tkinter import ttk
from tkinter import font

def main():
     root = tk.Tk()
     veramono = font.Font(family="Bitstream Vera Sans Mono", size=9)
     # Doesn't change anything:
     #ttk.Style().configure("TWidget", font=veramono)
     # Doesn't change anything either:
     verastyle = ttk.Style()
     verastyle.configure("TWidget", font=veramono)
     root.title("Titelschrift?")
     ttk.Label(root, text="Wie sieht das aus?").pack(
              side="top", padx=5, pady=5)
     versuchstext = tk.StringVar()
     versuchstext.set("Und das hier?")
     ttk.Entry(root, textvariable=versuchstext).pack(
               side="top", padx=5, pady=5)
     root.mainloop()

if __name__ == "__main__":
     main()

Initializing Label and Entry with "style=verastyle" results in this 
exception:

Traceback (most recent call last):
   File "./changefont.pyw", line 26, in <module>
     main()
   File "./changefont.pyw", line 17, in main
     ttk.Label(root, text="Wie sieht das aus?",
   File "/usr/lib/python3.8/tkinter/ttk.py", line 759, in __init__
     Widget.__init__(self, master, "ttk::label", kw)
   File "/usr/lib/python3.8/tkinter/ttk.py", line 557, in __init__
     tkinter.Widget.__init__(self, master, widgetname, kw=kw)
   File "/usr/lib/python3.8/tkinter/__init__.py", line 2567, in __init__
     self.tk.call(
_tkinter.TclError: Layout <tkinter.ttk.Style object at 0x7f3fc412a6a0> 
not found

And trying to reconfigure TkFixedFont like this:

def main():
     root = tk.Tk()
     fix = font.nametofont("TkFixedFont")
     fix.configure(family="Bitstream Vera Sans Mono")
     root.title("Titelschrift?")
     ttk.Label(root, text="Wie sieht das aus?", font=fix).pack(
               side="top", padx=5, pady=5)
     versuchstext = tk.StringVar()
     versuchstext.set("Und das hier?")
     ttk.Entry(root, textvariable=versuchstext).pack(
               side="top", padx=5, pady=5)
     root.mainloop()

doesn't change anything.

What's the right way to do this? Changing the standard monospace font 
for all of the installation would be possible, of course, but, as I 
said, it's quite nice for everything else.

Thank you for help,
Sibylle

From paul at tartan.co.za  Tue Jul 21 12:30:38 2020
From: paul at tartan.co.za (Paul Malherbe)
Date: Tue, 21 Jul 2020 18:30:38 +0200
Subject: [Tkinter-discuss] Force tkinter to use another fixed font
In-Reply-To: <e3507b29-8532-8f89-283a-5b5021986bba@web.de>
References: <e3507b29-8532-8f89-283a-5b5021986bba@web.de>
Message-ID: <7c74a7c9-7065-103b-9330-372699d2fc14@tartan.co.za>

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From nulla.epistola at web.de  Wed Jul 22 12:36:16 2020
From: nulla.epistola at web.de (Sibylle Koczian)
Date: Wed, 22 Jul 2020 18:36:16 +0200
Subject: [Tkinter-discuss] Force tkinter to use another fixed font
In-Reply-To: <7c74a7c9-7065-103b-9330-372699d2fc14@tartan.co.za>
References: <e3507b29-8532-8f89-283a-5b5021986bba@web.de>
 <7c74a7c9-7065-103b-9330-372699d2fc14@tartan.co.za>
Message-ID: <0112a5ea-d64e-27b4-a2f3-84acf629129b@web.de>

Am 21.07.2020 um 18:30 schrieb Paul Malherbe:
> Hi
>
> ttk.Entry and ttk.Label use TkDefaultFont therefore changing TkFixedFont
> will not work.
>
Thank you for making me look at this - it's even worse: ttk.Label uses
TkDefaultFont, ttk.Entry uses TkTextFont. So that's definitely not the
right way.

> use
>
> style.configure("TLabel", font=yourfont)
>
> style.configure("TEntry", font=yourfont)
>
That's exactly the method I'd like to avoid: even a small to middling
application will use more than two different widget classes, and every
single one of them would need a separate call to style.configure. Every
change of the chosen font would have to be repeated for every widget class.

I had hoped that a style defined for the base class would be inherited
by subclasses, but that doesn't seem to be the case.

Will try next with setting a font for the Tk() instance.

Regards,
Sibylle

From nulla.epistola at web.de  Tue Jul 28 04:23:59 2020
From: nulla.epistola at web.de (Sibylle Koczian)
Date: Tue, 28 Jul 2020 10:23:59 +0200
Subject: [Tkinter-discuss] Force tkinter to use another fixed font
In-Reply-To: <0112a5ea-d64e-27b4-a2f3-84acf629129b@web.de>
References: <e3507b29-8532-8f89-283a-5b5021986bba@web.de>
 <7c74a7c9-7065-103b-9330-372699d2fc14@tartan.co.za>
 <0112a5ea-d64e-27b4-a2f3-84acf629129b@web.de>
Message-ID: <8ac3624b-f74b-056e-1394-4b7efa3004d4@web.de>

Am 22.07.2020 um 18:36 schrieb Sibylle Koczian:
> Am 21.07.2020 um 18:30 schrieb Paul Malherbe:
>> Hi
>>
>> ttk.Entry and ttk.Label use TkDefaultFont therefore changing TkFixedFont
>> will not work.
>>
> Thank you for making me look at this - it's even worse: ttk.Label uses
> TkDefaultFont, ttk.Entry uses TkTextFont. So that's definitely not the
> right way.
>

No, I think now it _is_ a comparatively simple way:

import tkinter as tk
from tkinter import ttk
from tkinter import font


def changefonts():
     for fontname in [f for f in font.names()
                      if font.nametofont(f).actual()["family"] ==
                      "Inconsolata"]:
         font.nametofont(fontname).config(
             family="Bitstream Vera Sans Mono")

def main():
     root = tk.Tk()
     changefonts()
     ###... build your gui
     root.mainloop()

if __name__ == "__main__":
     main()

This should work for all themes. It seems unnecessary on Windows and on
Linux problems with the fonts probably depend on the chosen desktop
manager.

Regards
Sibylle