Change Font Size and Font Style – Python Tkinter GUI Tutorial 193

In this video we’ll add the ability to change the font size and font style in our font dialog app.

We’ll add whatever font sizes you want, and we’ll also add these styles: regular (normal), bold, italic, underline, and strikethrough.

Python Code: font_dialog.py
(Github Code)

from tkinter import *
from tkinter import font

root = Tk()
root.title('Codemy.com - Font Dialog Box')
root.iconbitmap('c:/gui/codemy.ico')
root.geometry("540x500")

# Change Font Size
def font_size_chooser(e):
	our_font.config(
		size=font_size_listbox.get(font_size_listbox.curselection()))

# Change Font Style
def font_style_chooser(e):
	style = font_style_listbox.get(font_style_listbox.curselection()).lower()

	if style == "bold":
		our_font.config(weight=style)
	if style == "regular":
		our_font.config(weight="normal", slant="roman", underline=0, overstrike=0)
	if style == "italic":
		our_font.config(slant=style)
	if style == "bold/italic":
		our_font.config(weight="bold", slant="italic")
	if style == "underline":
		our_font.config(underline=1)
	if style == "strike":
		our_font.config(overstrike=1)

# Create font chooser function
def font_chooser(e):
	our_font.config(
		family=my_listbox.get(my_listbox.curselection()))

# Designate Our Font
our_font = font.Font(family="Helvetica", size="32")

# Add Frame
my_frame = Frame(root, width=510, height=275)
my_frame.pack(pady=10)
# Freeze Frame in place
my_frame.grid_propagate(False)
my_frame.columnconfigure(0, weight=10)

# Add Text Box
my_text = Text(my_frame, font=our_font)
my_text.grid(row=0, column=0)
my_text.grid_rowconfigure(0, weight=1)
my_text.grid_columnconfigure(0, weight=1)

# Bottom Frame
bottom_frame = Frame(root)
bottom_frame.pack()

# Add Labels
font_label = Label(bottom_frame, text="Choose Font", font=("Helvetica", 14))
font_label.grid(row=0, column=0, padx=10, sticky=W)

size_label = Label(bottom_frame, text="Font Size", font=("Helvetica", 14))
size_label.grid(row=0, column=1, sticky=W)

style_label = Label(bottom_frame, text="Font Style", font=("Helvetica", 14))
style_label.grid(row=0, column=2, padx=10, sticky=W)


# Add Listbox
my_listbox = Listbox(bottom_frame, selectmode=SINGLE, width=40)
my_listbox.grid(row=1, column=0, padx=10)

# Size Listbox
font_size_listbox = Listbox(bottom_frame, selectmode=SINGLE, width=20 )
font_size_listbox.grid(row=1, column=1)

# Style Listbox
font_style_listbox = Listbox(bottom_frame, selectmode=SINGLE, width=20 )
font_style_listbox.grid(row=1, column=2, padx=10)


# Add Font Families To Listbox
for f in font.families():
	my_listbox.insert('end', f)

# Add Sizes to Size Listbox
font_sizes = [8, 10, 12, 14, 16, 18, 20, 36, 48]
for size in font_sizes:
	font_size_listbox.insert('end', size)

# Add Styles To Style Listbox
font_styles = ["Regular", "Bold", "Italic", "Bold/Italic", "Underline", "Strike"]
for style in font_styles:
	font_style_listbox.insert('end', style)	


# Bind The Listbox
my_listbox.bind('', font_chooser)
font_size_listbox.bind('', font_size_chooser)
font_style_listbox.bind('', font_style_chooser)

root.mainloop()