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.py
def main():
    app = Tkinter.Frame()
    app.grid()
    make_ui(app)
    app.mainloop()

# "make_ui" is the almost the same as in tkinter_label.py.
# Here, we create an "entry" widget after creating the
# label widget (but before the buttons).  We now arrange
# the four widgets into a 2x2 grid, with the first row
# being the label and entry, and the second row the two
# buttons.  (Notice that when you run the program, the
# buttons are not evenly spaced.)
#
# The entry widget does not have a callback function,
# so we change our buttons so that one still quits, but
# the other prints the contents of the entry widget out
# on "standard output", usually the terminal window
# where we invoked this program.
def make_ui(app):
    def quit_cb(app=app):
        app.quit()
    label = Tkinter.Label(app, text="Prompt")
    label.grid(row=0, column=0)
    entry = Tkinter.Entry(app)
    entry.grid(row=0, column=1)
    def echo_cb(entry=entry):
        print("Entry contains '%s'" % entry.get())
    button = Tkinter.Button(app, text="Echo", command=echo_cb)
    button.grid(row=1, column=0)
    button = Tkinter.Button(app, text="Quit", command=quit_cb)
    button.grid(row=1, column=1)

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