'''
Created on Aug 13, 2017
@author: Aditya
this program demosntrates the use of Label widgets.
'''
import tkinter as tk
from tkinter import ttk
class GreetingApp:
def __init__(self, master): # constructor method
# define list of label texts
self.greet_list = ('Hello, World! This is python GUI.', \
'Hello, This is Python GUI. Sadly, I was made to say Hello only. I will love to say so much more.')
# creat label as a child of root window with some text.
self.label = ttk.Label(master, text = self.greet_list[0])
self.btn = ttk.Button(master, text = 'Greet Again', command = self.handle_text) # create a button
# store image in the label obj to keep it in the scope as
# long as label is displayed and to avoid getting the image getting garbage collected
imgpath = 'simple_gif.gif' # path of the image
self.label.img = tk.PhotoImage(file = imgpath) # read_image :: saving image within label_object to prevent its garbage collection
self.label.config(image = self.label.img) # display image in label widget
self.label.config(compound = 'left') # to display image in left of text
self.label.pack() # pack label to the window with pack() geometry method of Label
self.btn.pack()
self.label.config(wraplength = 200) # specify wraplength of text in label
self.label.config(justify = tk.CENTER) # justify text in label to (CENTER, RIGHT or LEFT)
self.label.config(foreground = 'blue', background = 'yellow') # insert font color (foreground) and background color
self.label.config(font = ('Times', 10, 'bold')) # font = (font_name, font_size, font_type)
def handle_text(self):
if self.label['text'] == self.greet_list[0]:
self.label.config(text = self.greet_list[1])
else:
self.label.config(text = self.greet_list[0])
def GreetingAppLaunch(): # function to use class defined
root = tk.Tk()
GreetingApp(root)
root.mainloop()
def test():
GreetingAppLaunch()
if __name__ == '__main__': test()
