#Jocelyn Reynolds
#This program converts distances inkilometers
#to miles. The result is displayed in an info
#dialog box.

import tkinter
import tkinter.messagebox

class KiloConverterGUI:
    def __init__(self):
        #Create the main window.
        self.main_window = tkinter.Tk()

        #Create two frames to group widgets.
        self.top_frame = tkinter.Frame(self.main_window)
        self.bottom_frame = tkinter.Frame(self.main_window)

        #create the widgets for the top frame.
        self.prompt_label = tkinter.Label(self.top_frame, \
                                    text = 'Enter a distance in kilometers: ')
        self.kilo_entry = tkinter.Entry(self.top_frame, \
                                        width = 10)

        #Pack the top frame's widgets.
        self.prompt_label.pack(side = 'left')
        self.kilo_entry.pack(side = 'left')

        #Create the button widgets for the bottom frame.
        self.calc_button = tkinter.Button(self.bottom_frame, \
                                          text = 'Convert', \
                                          command = self.convert)
        self.quit_button = tkinter.Button(self.bottom_frame, \
                                          text = 'Quit', \
                                          command = self.main_window.destroy)

        #Pack the buttons.

        self.calc_button.pack(side= 'left')
        self.quit_button.pack(side = 'left')

        #Pack the frames.
        self.top_frame.pack()
        self.bottom_frame.pack()

        #Enter the tkinter main loop.

        tkinter.mainloop()

        #The convert method is a callback function for
        #the Calculate button.

    def convert(self):
            #Get the value entered by the user into the
            #kilo_entry widget.

        kilo = float(self.kilo_entry.get())

        #Convert kilometers to miles
        miles = kilo * 0.6214

        #Display the results in an info dialog box.
        tkinter.messagebox.showinfo('Results', \
        str(kilo) + 'kilometers is equal to' + \
        str(miles) + 'miles.')

#Create an instance of the KiloConverterGUI class.
kilo_conv = KiloConverterGUI()