Managing font family size and style from menu bar of text inside Text Widget of Tkinter

Tkinter managing font family, size and style of text widget from menu bar

`my_font_family(f_type)`	Receives font family name and set it
`my_font_size(dir)`	Receives direction and accordingly increase or decrease font size
`my_font_style()`	Reads the radio button selected value and set the style accordingly.

font option of text widget

The font option of text widget takes three inputs, we will prepare one list and use it to add / update the font option.

font1=['Times',12,'normal'] # default font details

my_font_family(f_type)

Our Font menu item has one sub-menu menu_sub_family which can be used to select one of the font family. There is a command option to trigger the my_font_family() function with name of the font family passed as parameter. Here more font family can be added by extending the submenu menu_sub_family.

menu_sub_family.add_command(label='Times',command=lambda:my_font_family('Times')) 
menu_sub_family.add_command(label='Arial Black',command=lambda:my_font_family('Arial Black'))

Inside the function my_font_family() we receive the font family name and update the first element of the font1 ( list ) with this name. After updating, we used config to change the font option of the text widget.

def my_font_family(f_type): # select font family 
    font1[0]=f_type # set the font family 
    t1.config(font=font1) # config the font

my_font_size(dir)

We have two commands to in our font menu, both runs the same function my_font_size() with different parameters ( increase or decrease ) to give direction as parameter for changing the font size.

menu_font.add_command(label="Zoom ++",command=lambda:my_font_size('increase')) #
menu_font.add_command(label="Zoom --",command=lambda:my_font_size('decrease'))

Inside the function my_font_size() we receive the direction as per the user click of the menu option. Here font size is 2^nd element of the list font1. We are increasing or decreasing based on the parameter ( dir ) value.

def my_font_size(dir): # font size is increased or decreased
    if(dir=='increase'):
        font1[1]=font1[1]+2 # increase font size 
    elif(dir=='decrease'):
        font1[1]=font1[1]-2 # decrease font size
    t1.config(font=font1)   # configure the font

def my_font_style()

We will use radio buttons for this in our menu. One common IntVar() ( r1_v )is used for the radio buttons and it holds the value based on the user selection of radio button. For the three options Normal, Bold and Underline the variable r1_v holds the value 1, 2 and 3 respectively.

r1_v = tk.IntVar(my_w) # for radio buttons

menu_sub_style.add_radiobutton(label='Normal',value=1,variable=r1_v,command=lambda:my_font_style())
menu_sub_style.add_radiobutton(label='Bold',value=2,variable=r1_v,command=lambda:my_font_style())
menu_sub_style.add_radiobutton(label='Underline',value=3,variable=r1_v,command=lambda:my_font_style())

Here user can select one of the three available options and on click of the radio buttons the function my_font_style() is executed. Inside this function we read the value of the variable r1_v and accourdingly the style for the font list is updated. Note that here the 3^rd element of the list font1 is the style for the font list.

def my_font_style(): # selection of sub menu for style
    if(r1_v.get()==1): # reading the value of r1_v 
        font1[2]='normal'
    elif(r1_v.get()==2):
        font1[2]='bold'
    elif(r1_v.get()==3):
        font1[2]='underline'    
    t1.config(font=font1) # configure the font

You can read more about the menu and its sub-menu here.

Full code is here .

import tkinter as tk
from tkinter import *
from tkinter import BOTH, END, LEFT

my_w = tk.Tk()
my_w.geometry("700x450") 
my_frame = Frame(my_w, width=600, height=400)
my_frame.pack(fill="both", expand=1)
my_frame.pack_propagate(0)

l1 = tk.Label(my_frame,text='Your text', width=10) #add Label 
l1.pack(fill="both", expand=0,padx=10)
#l1.grid(row=0,column=0,sticky='W') 

font1=['Times',12,'normal'] # default font details 
t1 = tk.Text(my_frame,height=4,font=font1) #text box
t1.pack(fill="both", expand=1,padx=10,pady=40)
#t1.grid(row=1,column=0,columnspan=2,padx=5,pady=10) 
my_str="Welcome to plus2net \n Learn " 
my_str = my_str + " about Tkitner Python baiscs and more..."
t1.insert(tk.END, my_str) # add default string to text widget 

def my_font_family(f_type): # select font family 
    font1[0]=f_type # set the font family 
    t1.config(font=font1) # config the font 
    
def my_font_size(dir): # font size is increased or decreased
    if(dir=='increase'):
        font1[1]=font1[1]+2 # increase font size 
    elif(dir=='decrease'):
        font1[1]=font1[1]-2 # decrease font size
    t1.config(font=font1)   # configure the font 
    
def my_font_style(): # selection of sub menu for style
    if(r1_v.get()==1): # reading the value of r1_v 
        font1[2]='normal'
    elif(r1_v.get()==2):
        font1[2]='bold'
    elif(r1_v.get()==3):
        font1[2]='underline'    
    t1.config(font=font1) # configure the font   
r1_v = tk.IntVar(my_w) # for radio buttons 

menubar = tk.Menu(my_w) 
menu_font = tk.Menu(menubar,title='my title' ,
    tearoff=1,fg='red',bg='yellow') # file
menu_file=tk.Menu(menubar,tearoff=0)  # edit menu 
menu_sub_family=tk.Menu(menu_font,tearoff=0,bg='lightgreen')
menu_sub_style=tk.Menu(menu_font,tearoff=0,bg='lightblue')
menu_font.add_command(label="Zoom ++",command=lambda:my_font_size('increase')) #
menu_font.add_command(label="Zoom --",command=lambda:my_font_size('decrease')) # 
menu_font.add_cascade(label='Font Family',menu=menu_sub_family ) # add sub
menu_font.add_cascade(label='Font style',menu=menu_sub_style ) # add sub

menu_sub_family.add_command(label='Times',command=lambda:my_font_family('Times')) 
menu_sub_family.add_command(label='Arial Black',command=lambda:my_font_family('Arial Black'))

menu_sub_style.add_radiobutton(label='Normal',value=1,variable=r1_v,command=lambda:my_font_style())
menu_sub_style.add_radiobutton(label='Bold',value=2,variable=r1_v,command=lambda:my_font_style())
menu_sub_style.add_radiobutton(label='Underline',value=3,variable=r1_v,command=lambda:my_font_style())

menubar.add_cascade(label="File", menu=menu_file) # Top Line
menubar.add_cascade(label="Font", menu=menu_font) # Top Line

menu_file.add_command(label="New") # Item 1 of file
menu_file.add_command(label="Open..") # Item 2  
menu_file.add_separator()

menu_file.add_command(label="Exit", command=my_w.quit) # Item 3  

my_w.config(menu=menubar) # adding menu to window
my_w.mainloop()

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Subhendu Mohapatra

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Font family size and style in tkinter Text

font option of text widget

my_font_family(f_type)

my_font_size(dir)

def my_font_style()

Subhendu Mohapatra