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46 lines
1.7 KiB
Python
46 lines
1.7 KiB
Python
from tkinter import *
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import string
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# This program shows how to make a typein box shadow a program variable.
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class App(Frame):
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def __init__(self, master=None):
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Frame.__init__(self, master)
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self.pack()
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self.entrythingy = Entry(self)
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self.entrythingy.pack()
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self.button = Button(self, text="Uppercase The Entry",
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command=self.upper)
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self.button.pack()
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# here we have the text in the entry widget tied to a variable.
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# changes in the variable are echoed in the widget and vice versa.
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# Very handy.
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# there are other Variable types. See Tkinter.py for all
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# the other variable types that can be shadowed
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self.contents = StringVar()
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self.contents.set("this is a variable")
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self.entrythingy.config(textvariable=self.contents)
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# and here we get a callback when the user hits return. we could
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# make the key that triggers the callback anything we wanted to.
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# other typical options might be <Key-Tab> or <Key> (for anything)
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self.entrythingy.bind('<Key-Return>', self.print_contents)
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def upper(self):
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# notice here, we don't actually refer to the entry box.
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# we just operate on the string variable and we
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# because it's being looked at by the entry widget, changing
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# the variable changes the entry widget display automatically.
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# the strange get/set operators are clunky, true...
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str = string.upper(self.contents.get())
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self.contents.set(str)
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def print_contents(self, event):
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print("hi. contents of entry is now ---->", self.contents.get())
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root = App()
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root.master.title("Foo")
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root.mainloop()
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