GUI component interaction: Difference between revisions

=={{header|Python}}==

{{libheader|Tkinter}}

<lang python>import random

from Tkinter import *

import tkMessageBox

class Application(Frame):

def __init__(self, master):

Frame.__init__(self, master)

self.counter = 0

self.contents = StringVar()

self.contents.set(str(self.counter))

self.pack(expand=True, fill='both', padx=10, pady=15)

self.create_widgets()

def increment(self, *args):

self.counter += 1

self.update_entry()

def random(self):

if tkMessageBox.askyesno("Confirmation", "Reset to random value ?"):

self.counter = random.randint(0, 5000)

self.update_entry()

def entry_updated(self, event, *args):

if not event.char:

return 'break'

if not event.char.isdigit():

tkMessageBox.showerror('Error', 'Invalid input !')

return 'break'

self.counter = int('%s%s' % (self.contents.get(), event.char))

def update_entry(self):

self.contents.set(str(self.counter))

self.entry['textvariable'] = self.contents

def create_widgets(self):

options = {'expand': True, 'fill': 'x', 'side': 'left', 'padx': 5}

self.entry = Entry(self)

self.entry.bind('<Key>', self.entry_updated)

self.entry.pack(**options)

self.update_entry()

self.increment_button = Button(self, text='Increment', command=self.increment)

self.increment_button.pack(**options)

self.random_button = Button(self, text='Random', command=self.random)

self.random_button.pack(**options)

if __name__ == '__main__':

root = Tk()

try:

app = Application(master=root)

app.master.title("Rosetta code")

app.mainloop()

except KeyboardInterrupt:

root.destroy()</lang>

[[File:GuiInterationPython.png]]