tkinter_bug.py

#!/usr/bin/env python
from Tkinter import *
import tkFileDialog

class MyGUI:
  def __init__(self):
    ## Make the main window
    self.root_window = Tk()

    ## Add a button to the main window and "grid" it
    self.main_button = Button(self.root_window, text = "Click Me...", command = self.say_hi)
    self.main_button.grid(row = 0, column = 0, sticky = E+W)

    ## Create a "stringVar" object that can be read/written to by GUI objects
    self.message = StringVar(self.root_window)
    self.message.set("Default Message")

    ## An input, which puts it input into self.message
    self.input = Entry(self.root_window, textvariable = self.message)
    self.input.grid(row = 1, column = 0, sticky = E+W)

    ## An output lable, text is "..." initally
    self.out_label = Label(self.root_window, text = "...")
    self.out_label.grid(row = 2, column = 0, pady = [20, 0])




    ## Create a new "frame" (for a subgrid) on the right side
    self.right_frame = Frame(self.root_window, width = 200, bg = "blue")
    self.right_frame.grid(row = 0, column = 1, rowspan = 2)

    ## Put a label in there
    self.right_label = Label(self.right_frame, text = "Info here")
    self.right_label.grid(row = 0, column = 0, sticky = E+W)

    ## Note: probably we don't want to attache self.message; that's what is displyed by default
    ## Dropdowns need a command function that take an argument
    self.dropdown = OptionMenu(self.right_frame, self.message, "One", "Two", "Three", command = self.say_hi_with_param)
    self.dropdown.grid(row = 1, column = 0, sticky = E+W)

    ## This might be better, another one in the right frame
    ## Here we're using a command function that takes an optional argument so it can work with both a dropdown and a button
    self.dropdown2 = OptionMenu(self.right_frame, "Pick one:", "One", "Two", "Three", command = self.say_hi_with_optional_param)
    self.dropdown2.grid(row = 2, column = 0, sticky = E+W)

    ## And a button in the right frame
    ## Here we're using a command function that takes an optional argument so it can work with both a dropdown and a button
    self.sub_button = Button(self.right_frame, text = "Click ME!", command = self.say_hi_with_optional_param)
    self.sub_button.grid(row = 3, column = 0, sticky = E+W)



    ## Configure the columns of the main grid so they can "stretch"
    self.root_window.columnconfigure(0, weight = 1)
    self.root_window.columnconfigure(1, weight = 4)

    ## cause the main window to loop/display
    self.root_window.mainloop()

  ## A function that reads the contents of the self.message variable and prints it,
  ## and puts the contents in the self.out_label
  def say_hi(self):
    message = self.message.get()
    self.out_label["text"] = "Hello there ;) " + message
    print("Hello there ;) " + message)

  ## A function that takes a parameter and puts it in the
  ## self.out_label
  def say_hi_with_param(self, inputmessage):
    self.out_label["text"] = inputmessage

  ## A function that takes an optional parameter and puts it in the
  ## self.out_label, if no parameter is given, it gets the message from self.message
  def say_hi_with_optional_param(self, inputmessage = None):
    if inputmessage == None:
      message = self.message.get()
    else:
      message = inputmessage

    self.out_label["text"] = message



# create an instance of the class
mygui = MyGUI()