#!/usr/bin/env python
# Conversor de Temperatura
# por Rudson Alves

import pygtk
pygtk.require('2.0')
import gtk

def calc_Fahrenheit(temp):
    return round(9.*temp/5. + 32.,2)

def calc_Celsius(temp):
    return round(5.*(temp - 32.)/9.,2)

# Classe TempConv
class TempConv:
    def change_focus(self, widget, event, Temp_out):
        if event.keyval == 65293:
            Temp_out.grab_focus()

    def calcule_temp(self, widget, event, Temp_out):
        name = widget.get_name()
        temp = float(widget.get_text())
        if name == 'Temp_C':
            Temp_out.set_text('%0.2f' % calc_Fahrenheit(temp))
        else:
            Temp_out.set_text('%0.2f' % calc_Celsius(temp))

    def __init__(self):
        win_main = gtk.Window(gtk.WINDOW_TOPLEVEL)
        win_main.set_position(gtk.WIN_POS_CENTER)
        win_main.set_title('TempConv')
        win_main.set_border_width(10)
        win_main.connect('destroy', gtk.main_quit)

        vbox = gtk.VBox(False, 0)
        win_main.add(vbox)

        Temp_C = gtk.Entry()
        Temp_F = gtk.Entry()
        Temp_C.set_name('Temp_C')
        Temp_F.set_name('Temp_F')
        Temp_C.set_text('0.00')
        Temp_F.set_text('32.00')

        Temp_C.set_size_request(60,23)
        Temp_F.set_size_request(60,23)

        Label_C = gtk.Label("Celsius")
        Label_F = gtk.Label("Fahrenheit")

        hbox = gtk.HBox(True, 0)
        hbox.pack_start(Label_C, False, False, 3)
        hbox.pack_start(Temp_C, False, False, 3)
        vbox.pack_start(hbox, True, True, 0)

        hbox = gtk.HBox(True, 0)
        hbox.pack_start(Label_F, False, False, 3)
        hbox.pack_start(Temp_F, False, False, 3)
        vbox.pack_start(hbox, True, True, 0)

        Close_button = gtk.Button("Close")
        hbox = gtk.HBox(False, 0)
        hbox.pack_start(Close_button, True, True, 5)
        vbox.pack_start(hbox, False, False, 5)

        Close_button.connect("clicked", gtk.main_quit)
        Temp_C.connect("focus-out-event", self.calcule_temp, Temp_F)
        Temp_F.connect("focus-out-event", self.calcule_temp, Temp_C)
        Temp_C.connect("key-press-event", self.change_focus, Temp_F)
        Temp_F.connect("key-press-event", self.change_focus, Temp_C)

        win_main.show_all()

def main():
    gtk.main()
    return 0

if __name__ == "__main__":
    TempConv()
    main()