python - How do you make a font dialog in tkinter?

Question

I need help making a font dialog in tkinter.

Here is my code so far:

from tkinter import *

root = Tk()
root.geometry("600x600")

def fontDialog():
    root2 = Toplevel(root)
    root2.geometry("300x300")
    root2.mainloop

button = Button(root, text="font dialog", command=fontDialog)

root.mainloop

So in def fontDialog, I made a screen. I don't know how to make a font dialog that changes the font family and size. If you do please help.

Answer 1

A font chooser is very simple to make. All you really do is run a loop on font.families() and insert the return of each iteration into a Listbox. From there, you just tell it to change the family of a persistent font reference to whatever is selected in the Listbox when the Listbox is clicked. The font will change for anything that has the persistent font reference applied to its font option.

import tkinter as tk
from tkinter import font


class App(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)

        #persistent font reference
        textfont = font.Font(family='arial', size='14')
        
        #something to type in ~ uses the persistent font reference
        tk.Text(self, font=textfont).grid(row=0, column=0, sticky='nswe')
        
        #make the textfield fill all available space
        self.grid_rowconfigure(0, weight=1)
        self.grid_columnconfigure(0, weight=1)
        
        #font chooser
        fc = tk.Listbox(self)
        fc.grid(row=0, column=1, sticky='nswe')

        #insert all the fonts
        for f in font.families():
            fc.insert('end', f)

        #switch textfont family on release
        fc.bind('<ButtonRelease-1>', lambda e: textfont.config(family=fc.get(fc.curselection())))
        
        #scrollbar ~ you can actually just use the mousewheel to scroll
        vsb = tk.Scrollbar(self)
        vsb.grid(row=0, column=2, sticky='ns')
        
        #connect the scrollbar and font chooser
        fc.configure(yscrollcommand=vsb.set)
        vsb.configure(command=fc.yview)


if __name__ == "__main__":
    app = App()
    app.title('Font Chooser Example')
    app.geometry(f'800x600+200+200')
    app.mainloop()