CSC15 - Lab #12.py

import tkinter

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

        # Create three frames to group widgets.
        self.top_frame = tkinter.Frame()
        self.mid_frame = tkinter.Frame()
        self.bottom_frame = tkinter.Frame()

        # Create the widgets for the top frame.
        self.prompt_label = tkinter.Label(self.top_frame,
                                text= 'Enter a temperature in Celsius:')
        self.temp_entry = tkinter.Entry(self.top_frame, width=10)

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

        # Create the widgets for the middle frame.
        self.descr_label = tkinter.Label(self.mid_frame,
                                text= 'Converted to Fahrenheit:')

        # We need a StringVar object to associate with
        # an output label. Use the object’s set method
        # to store a string of blank characters.
        self.value = tkinter.StringVar()

        # Create a label and associate it with the
        # StringVar object. Any value stored in the
        # StringVar object will automatically be displayed
        # in the label.
        self.miles_label = tkinter.Label(self.mid_frame,
                                textvariable=self.value)
        # Pack the middle frame’s widgets.
        self.descr_label.pack(side='left')
        self.miles_label.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.mid_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
        # temp_entry widget.
        temp = float(self.temp_entry.get())

        # Convert kilometers to miles.
        fahrenheit = temp * (9/5) + 32

        # Convert miles to a string and store it
        # in the StringVar object. This will automatically
        # update the miles_label widget.
        self.value.set(fahrenheit)

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