mirror of https://github.com/python/cpython
48 lines
1.5 KiB
Python
48 lines
1.5 KiB
Python
from Tkinter import *
|
|
import string
|
|
|
|
# This program shows how to make a typein box shadow a program variable.
|
|
|
|
class App(Frame):
|
|
def __init__(self, master=None):
|
|
Frame.__init__(self, master)
|
|
self.pack()
|
|
|
|
self.entrythingy = Entry()
|
|
self.entrythingy.pack()
|
|
|
|
self.button = Button(self, {"text" : "Uppercase The Entry", "command" : self.upper})
|
|
self.button.pack()
|
|
|
|
|
|
# here we have the text in the entry widget tied to a variable.
|
|
# changes in the variable are echoed in the widget and vice versa.
|
|
# Very handy.
|
|
# there are other Variable types. See Tkinter.py for all
|
|
# the other variable types that can be shadowed
|
|
self.contents = StringVar()
|
|
self.contents.set("this is a variable")
|
|
self.entrythingy.config({"textvariable":self.contents})
|
|
|
|
# and here we get a callback when the user hits return. we could
|
|
# make the key that triggers the callback anything we wanted to.
|
|
# other typical options might be <Key-Tab> or <Key> (for anything)
|
|
self.entrythingy.bind('<Key-Return>', self.print_contents)
|
|
|
|
def upper(self):
|
|
# notice here, we don't actually refer to the entry box.
|
|
# we just operate on the string variable and we
|
|
# because it's being looked at by the entry widget, changing
|
|
# the variable changes the entry widget display automatically.
|
|
# the strange get/set operators are clunky, true...
|
|
str = string.upper(self.contents.get())
|
|
self.contents.set(str)
|
|
|
|
def print_contents(self, event):
|
|
print "hi. contents of entry is now ---->", self.contents.get()
|
|
|
|
root = App()
|
|
root.master.title("Foo")
|
|
root.mainloop()
|
|
|