1 from Tkinter import * 2 import string 3 4 # This program shows how to make a typein box shadow a program variable. 5 6 class App(Frame): 7 def __init__(self, master=None): 8 Frame.__init__(self, master) 9 self.pack() 10 11 self.entrythingy = Entry(self) 12 self.entrythingy.pack() 13 14 self.button = Button(self, text="Uppercase The Entry", 15 command=self.upper) 16 self.button.pack() 17 18 # here we have the text in the entry widget tied to a variable. 19 # changes in the variable are echoed in the widget and vice versa. 20 # Very handy. 21 # there are other Variable types. See Tkinter.py for all 22 # the other variable types that can be shadowed 23 self.contents = StringVar() 24 self.contents.set("this is a variable") 25 self.entrythingy.config(textvariable=self.contents) 26 27 # and here we get a callback when the user hits return. we could 28 # make the key that triggers the callback anything we wanted to. 29 # other typical options might be <Key-Tab> or <Key> (for anything) 30 self.entrythingy.bind('<Key-Return>', self.print_contents) 31 32 def upper(self): 33 # notice here, we don't actually refer to the entry box. 34 # we just operate on the string variable and we 35 # because it's being looked at by the entry widget, changing 36 # the variable changes the entry widget display automatically. 37 # the strange get/set operators are clunky, true... 38 str = string.upper(self.contents.get()) 39 self.contents.set(str) 40 41 def print_contents(self, event): 42 print "hi. contents of entry is now ---->", self.contents.get() 43 44 root = App() 45 root.master.title("Foo") 46 root.mainloop() 47
