from __future__ import print_function

#
# Create a GUI with a text entry field.
#
try:
    import Tkinter
except ImportError:
    import tkinter as Tkinter

# We use the same pattern as tkinter_label_entry.py
def main():
    app = Tkinter.Frame()
    app.grid()
    make_ui(app)
    app.mainloop()

# "make_ui" is similar to the one in tkinter_label_entry.py.
# Here, instead of arranging the four widgets into a 2x2
# grid, we create two rows: "f1" and "f2", with "f1" on
# top of "f2".  The label and entry widgets are in f1 and
# the two buttons are in f2.  Note that when you run the
# program, the two buttons are now evenly spaced, because
# the column widths in f1 are different than those in f2.
#
# We also changed the callback function "echo_cb".  Instead
# of printing the contents of the entry widget to standard
# output, we reconfigure the label widget so that its text
# matches the entry widget.  Almost all attributes, eg
# background color, text color, font, etc of all widgets
# may be altered using their "config" method.
def make_ui(app):
    def quit_cb(app=app):
        app.quit()
    f1 = Tkinter.Frame(app)
    f1.grid(row=0, column=0, sticky="nsew")
    label = Tkinter.Label(f1, text="Prompt")
    label.grid(row=0, column=0)
    entry = Tkinter.Entry(f1)
    entry.grid(row=0, column=1)
    def echo_cb(entry=entry, label=label):
        label.config(text=entry.get())

    f2 = Tkinter.Frame(app)
    f2.grid(row=1, column=0, sticky="nsew")
    button = Tkinter.Button(f2, text="Echo", command=echo_cb)
    button.grid(row=0, column=0)
    button = Tkinter.Button(f2, text="Quit", command=quit_cb)
    button.grid(row=0, column=1)

if __name__ == "__main__":
    main()
    print("Finished")