Demo/tkinter/matt/bind-w-mult-calls-p-type.py

   1 from Tkinter import *
   2 import string
   3
   4 # This program  shows how to use a simple type-in box
   5
   6 class App(Frame):
   7     def __init__(self, master=None):
   8         Frame.__init__(self, master)
   9         self.pack()
  10
  11         self.entrythingy = Entry()
  12         self.entrythingy.pack()
  13
  14         # and here we get a callback when the user hits return. we could
  15         # make the key that triggers the callback anything we wanted to.
  16         # other typical options might be <Key-Tab> or <Key> (for anything)
  17         self.entrythingy.bind('<Key-Return>', self.print_contents)
  18
  19         # Note that here is where we bind a completely different callback to
  20         # the same event. We pass "+" here to indicate that we wish to ADD
  21         # this callback to the list associated with this event type.
  22         # Not specifying "+" would simply override whatever callback was
  23         # defined on this event.
  24         self.entrythingy.bind('<Key-Return>', self.print_something_else, "+")
  25
  26     def print_contents(self, event):
  27         print "hi. contents of entry is now ---->", self.entrythingy.get()
  28
  29
  30     def print_something_else(self, event):
  31         print "hi. Now doing something completely different"
  32
  33
  34 root = App()
  35 root.master.title("Foo")
  36 root.mainloop()
  37
  38
  39
  40 # secret tip for experts: if you pass *any* non-false value as
  41 # the third parameter to bind(), Tkinter.py will accumulate
  42 # callbacks instead of overwriting. I use "+" here because that's
  43 # the Tk notation for getting this sort of behavior. The perfect GUI
  44 # interface would use a less obscure notation.