from tkinter import *
import string
# This program shows how to use a simple type-in box
class App(Frame):
def __init__(self, master=None):
Frame.__init__(self, master)
self.pack()
self.entrythingy = Entry()
self.entrythingy.pack()
# 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)
# Note that here is where we bind a completely different callback to
# the same event. We pass "+" here to indicate that we wish to ADD
# this callback to the list associated with this event type.
# Not specifying "+" would simply override whatever callback was
# defined on this event.
self.entrythingy.bind('<Key-Return>', self.print_something_else, "+")
def print_contents(self, event):
print("hi. contents of entry is now ---->", self.entrythingy.get())
def print_something_else(self, event):
print("hi. Now doing something completely different")
root = App()
root.master.title("Foo")
root.mainloop()
# secret tip for experts: if you pass *any* non-false value as
# the third parameter to bind(), Tkinter.py will accumulate
# callbacks instead of overwriting. I use "+" here because that's
# the Tk notation for getting this sort of behavior. The perfect GUI
# interface would use a less obscure notation.
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