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gui.py
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gui.py
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#!/usr/bin/env python
import tkinter as tk
from units import predefined, REGISTRY # requires pip package; TODO: bundle
predefined.define_units()
class App:
def __init__(self, root):
top_frame = tk.Frame(root)
top_frame.pack()
self.number = tk.DoubleVar() # floating point
self.number_button = tk.Entry(top_frame,
textvariable=self.number)
self.number_button.pack(side='left')
self.from_units = tk.StringVar()
self.from_units.set("m")
self.from_units_button = tk.Entry(top_frame,
textvariable=self.from_units)
self.from_units_button.pack(side='right')
self.convert_button = tk.Button(root, text="Convert",
command=self.convert)
self.convert_button.pack(side='bottom')
middle_frame = tk.Frame(root)
middle_frame.pack(side='bottom')
self.to_units = tk.StringVar()
self.to_units.set("ft")
self.to_units_button = tk.Entry(middle_frame,
textvariable=self.to_units)
self.to_units_button.pack(side='right')
self.result = tk.DoubleVar()
self.result_button = tk.Label(middle_frame,
textvariable=self.result)
self.result_button.pack(side='left')
def convert(self):
current_unit = REGISTRY[self.from_units.get()]
quantity = current_unit(self.number.get())
dest_unit = REGISTRY[self.to_units.get()]
self.result.set(dest_unit(quantity).num)
root = tk.Tk()
root.title("Units converter")
app = App(root)
root.mainloop()
try:
root.destroy()
except tk.TclError: # already destroyed
pass