| 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() |