/Demo/tkinter/matt/entry-with-shared-variable.py
http://unladen-swallow.googlecode.com/ · Python · 46 lines · 23 code · 9 blank · 14 comment · 0 complexity · e3cc599b5e9f142d05f2978d50561bbc MD5 · raw file
- 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)
- 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()