Zoom in & Out of text in tkinter Text


Tkinter Text Menu
Text zoom in and zoom out by button


Tkinter text zoom in and out using buttons and using menus and using scale to trigger the font size
import tkinter as tk
my_w = tk.Tk()
my_w.geometry("400x300")  
l1 = tk.Label(my_w,text='Your Name', width=10) #added one Label 
l1.grid(row=1,column=1) 
font1=['times',12,'normal']
t1 = tk.Text(my_w,width=10,height=1,font=font1) #text box
t1.grid(row=1,column=2,columnspan=2,pady=10) 
def my_fun(str1):
    if(str1=='plus'):
        font1[1]=font1[1]+2
    else:
        font1[1]=font1[1]-2
    t1.config(font=font1)

b1=tk.Button(my_w,text='+',command=lambda:my_fun('plus'))
b1.grid(row=2,column=2)
b2=tk.Button(my_w,text='-',command=lambda:my_fun('minus'))
b2.grid(row=2,column=3)

my_w.mainloop()

Using menubutton

Text zoom in and zoom out by menu

More about Menu buttons
import tkinter as tk
my_w = tk.Tk()
my_w.geometry("400x300")  
l1 = tk.Label(my_w,text='Your Name', width=10) #added one Label 
l1.grid(row=1,column=1) 
font1=['times',12,'normal']
t1 = tk.Text(my_w,width=10,height=1,font=font1) #text box
t1.grid(row=1,column=2,columnspan=2,pady=10) 
def my_fun(str1):
    if(str1=='plus'):
        font1[1]=font1[1]+2
    else:
        font1[1]=font1[1]-2
    t1.config(font=font1)

mb=tk.Menubutton(my_w,text='My Menu',
  activebackground='lightyellow',font=font1,
  underline=4,relief='raised',width=20)
mb.grid(row=2,column=1,padx=10)

mb.menu=tk.Menu(mb)
mb['menu']=mb.menu
mb.menu.add_command(label='Zoom ++',command=lambda:my_fun('plus'))
mb.menu.add_command(label='Zoom --',command=lambda:my_fun('minus'))
b1=tk.Button(my_w,text='+',command=lambda:my_fun('plus'))
b1.grid(row=2,column=2)
b2=tk.Button(my_w,text='-',command=lambda:my_fun('minus'))
b2.grid(row=2,column=3)

my_w.mainloop()

Using scale

More about scale here
Text zoom in and zoom out by scale
import tkinter as tk
my_w = tk.Tk()
my_w.geometry("400x300")  
l1 = tk.Label(my_w,text='Your Name', width=10) #added one Label 
l1.grid(row=1,column=1) 
font1=['times',12,'normal']
t1 = tk.Text(my_w,width=10,height=1,font=font1) #text box
t1.grid(row=1,column=2,columnspan=2,pady=10) 
def my_fun(str1):
    if(str1=='plus'):
        font1[1]=font1[1]+2
    else:
        font1[1]=font1[1]-2
    t1.config(font=font1)
def my_fun2(value):
    font1[1]=my_scale1.get()
    t1.config(font=font1)
my_scale1 = tk.Scale(my_w, from_=12, to=26, orient='horizontal',command=my_fun2)
my_scale1.grid(row=2,column=1,padx=4)

b1=tk.Button(my_w,text='+',command=lambda:my_fun('plus'))
b1.grid(row=2,column=2)
b2=tk.Button(my_w,text='-',command=lambda:my_fun('minus'))
b2.grid(row=2,column=3)

my_w.mainloop()
Zoom Parent window : More about managing geometry

Tkinter Text Python Tkinter Entry How to Validate user entered data
Managing Font option using Menu
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