neo1973-germany/unitc/unit_converter.py

295 lines
13 KiB
Python

#!/usr/bin/python
# -*- coding: utf-8 -*-
# unit_converter - Converts between different units
# version 0.1
# 2008/02/13
# by Patrick Beck
import pygtk
pygtk.require('2.0')
import gtk
import xml.dom.minidom
from sys import exit
try:
unitfile = 'unit.xml' # path to the unit file
file = xml.dom.minidom.parse(unitfile) # parse the xml file
except:
print 'The unitfile can not be opened or found'
exit()
class unitconvert(object):
toactive = 0 # status variable will be set to 1, when the 'to' field is the last activated field
fromactive = 0 # the same, only for the 'from' field
def delete_event(self, widget, event, data=None):
return False
def destroy(self, widget, data=None):
gtk.main_quit()
def fromentry_changed(self, widget):
self.fromactive = 1
self.toactive = 0
def toentry_changed(self, widget):
self.toactive = 1
self.fromactive = 0
def on_catcombo_changed(self, widget):
self.create_menu()
def category_isset(self): # get the selected category
categoryname = self.catcombo.get_active_text()
return categoryname
def unit_from_isset(self): # get the selected unit from the 'from' field
unit_from = self.fromcombo.get_active_text()
return unit_from
def unit_to_isset(self): # get the selected unit from the 'to' field
unit_to = self.tocombo.get_active_text()
return unit_to
def number_from_isset(self): # get the data from the 'from' entry field
getnumber_from = self.fromentry.get_text()
try: # Test if the entry is a number
number_from = float(getnumber_from.replace(',','.')) # replace the comma with a dot for the internal calculation
return number_from
except:
return 'nonnumber'
def number_to_isset(self): # get the data for the 'to' entry field
getnumber_to = self.toentry.get_text()
try: # Test if the entry is a number
number_to = float(getnumber_to.replace(',','.'))
return number_to
except:
return 'nonnumber'
def fromentry_set(self, printresult): # sets the result in the target field
self.fromentry.set_text(printresult)
def toentry_set(self, printresult): # the same as above
self.toentry.set_text(printresult)
def categorymenu(self): # creates the data for the category menu from the xml file
category = []
for categoryname in file.getElementsByTagName('category'): # browses through the elements in the file
category.append(categoryname.getAttribute('name')) # append the name to the category list
return category
def unitmenu(self): # creates the data for the unit menu
unit = []
set_category = self.category_isset() # checks for the active category to add this units
for categorynames in file.getElementsByTagName('category'): # search the categorys
if categorynames.getAttribute('name') == set_category: # search through the file according to the set category
for units in categorynames.getElementsByTagName('unit'): # get the units from the specific category
unit.append(units.getAttribute('name')) # appends the units from the category into the unit list
return unit
def create_menu(self): # fill the gui with the data from categorymenu and unitmenu
if self.category_isset() == None: # if no category menu exists
for categorys in self.categorymenu():
self.catcombo.append_text(categorys) # append the categorys to the menu
modelfrom = self.fromcombo.get_model() # get the data from the fromcombo field ...
modelfrom.clear() # ... and delete them for the new data
modelto = self.tocombo.get_model() # the same as fromcombo
modelto.clear()
for units in self.unitmenu():
self.fromcombo.append_text(units) # filling the unit menus
self.tocombo.append_text(units)
def convert(self, widget):
category_isset = self.category_isset() # get the active category from the gui
unit_to = self.unit_to_isset() # gets the active unit from the 'to' field
unit_from = self.unit_from_isset() # gets the same for the 'from' field
# a few tests for the inputs in the combo and entry field
if category_isset == None:
self.fromentry_set('Choose a category')
self.toentry_set('and the units')
elif unit_from == None and unit_to == None:
self.fromentry_set('Choose a unit')
self.toentry_set('Choose a unit')
elif unit_from == None:
self.fromentry_set('Choose a unit')
self.toentry_set('')
elif unit_to == None:
self.toentry_set('Choose a unit')
self.fromentry_set('')
# when the inputs are ok excecute the rest of the program
else:
if self.toactive == 1:
number = self.number_to_isset()
if number == 'nonnumber': # when the entry is not a number print a error
self.toentry_set('Error - put in a number')
else:
for categorynames in file.getElementsByTagName('category'): # search the categorys
if categorynames.getAttribute('name') == category_isset: # search through the file according to the set category
for units in categorynames.getElementsByTagName('unit'): # get the units from the specific category
if units.getAttribute('name') == unit_from: # the name from the unit in the category musst set in the to field
if self.fromactive == 1: # when active gets the to_ref field
toref = units.getAttribute('to_ref')
else:
fromref = units.getAttribute('from_ref') # else the from_ref field
if units.getAttribute('name') == unit_to:
if self.fromactive == 1:
fromref = units.getAttribute('from_ref')
else:
toref = units.getAttribute('to_ref')
# if self.fromactive == 1: # select the basis for the calculation => when the from field was changed use the data from this field
# number = number_from
# if self.toactive == 1:
# number = number_to
result = eval(toref) # execute the formular in the toref field and safe it to result
endresult = eval(fromref) # convert from the refunit to the target unit
printresult = str(endresult).replace('.',',') # for the better readability replace the dot with a comma
# if self.fromactive == 1:
# self.toentry_set(printresult) # sets the result into the 'from' field
# else:
self.fromentry_set(printresult) # same as above for the 'to' field
else:
number = self.number_from_isset()
if number == 'nonnumber': # when the entry is not a number print a error
self.fromentry_set('Error - put in a number')
else:
for categorynames in file.getElementsByTagName('category'): # search the categorys
if categorynames.getAttribute('name') == category_isset: # search through the file according to the set category
for units in categorynames.getElementsByTagName('unit'): # get the units from the specific category
if units.getAttribute('name') == unit_from: # the name from the unit in the category musst set in the to field
if self.fromactive == 1: # when active gets the to_ref field
toref = units.getAttribute('to_ref')
else:
fromref = units.getAttribute('from_ref') # else the from_ref field
if units.getAttribute('name') == unit_to:
if self.fromactive == 1:
fromref = units.getAttribute('from_ref')
else:
toref = units.getAttribute('to_ref')
# if self.fromactive == 1: # select the basis for the calculation => when the from field was changed use the data from this field
# number = number_from
# if self.toactive == 1:
# number = number_to
result = eval(toref) # execute the formular in the toref field and safe it to result
endresult = eval(fromref) # convert from the refunit to the target unit
printresult = str(endresult).replace('.',',') # for the better readability replace the dot with a comma
# if self.fromactive == 1:
self.toentry_set(printresult) # sets the result into the 'from' field
# else:
# self.fromentry_set(printresult) # same as above for the 'to' field
def clear(self, widget): # clears the entry fields
self.fromentry.set_text('')
self.toentry.set_text('')
def fromentry_cursor(self, widget, data=None):
self.fromentry.set_text('')
def toentry_cursor(self, widget, data=None):
self.toentry.set_text('')
def __init__(self):
self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
self.window.set_title('Unit Converter')
self.window.connect('delete_event', self.delete_event)
self.window.connect('destroy', self.destroy)
# create a box in the dimensions of the window and add it to them
self.box = gtk.VBox(False,2)
self.window.add(self.box)
# create a Hbox for the category and add them to self.box
self.catbox = gtk.HBox(True,2)
# frame for the category box
self.catframe = gtk.Frame('Category')
self.box.pack_start(self.catframe, False, False, 0)
# a combobox for the categorys
self.catcombo = gtk.combo_box_new_text()
self.catcombo.connect('changed', self.on_catcombo_changed)
self.catbox.pack_start(self.catcombo, False, False, 0)
self.catframe.add(self.catbox)
#create a vbox for the From units
self.frombox = gtk.VBox(False,2)
#frame for the from box
self.fromframe = gtk.Frame('Convert from ...')
self.box.pack_start(self.fromframe, False, False, 0)
self.fromframe.add(self.frombox)
#create a entry for the 'Convert from' field
self.fromentry = gtk.Entry()
self.fromentry.set_text('Input a number here ')
self.fromentry.connect('changed', self.fromentry_changed)
self.fromentry.connect('activate', self.convert)
self.fromentry.connect('focus_in_event', self.fromentry_cursor)
self.frombox.pack_start(self.fromentry, False, False, 0)
#a combobox for the from unit
self.fromcombo = gtk.combo_box_new_text()
self.frombox.pack_start(self.fromcombo, False, False, 0)
#create a vbox for the To units
self.tobox = gtk.VBox(False,2)
#frame for the to box
self.toframe = gtk.Frame('Convert to ...')
self.box.pack_start(self.toframe, False, False, 0)
self.toframe.add(self.tobox)
#create a entry for the 'Convert to' field
self.toentry = gtk.Entry()
self.toentry.set_text('... or here')
self.toentry.connect('changed', self.toentry_changed)
self.toentry.connect('activate', self.convert)
self.toentry.connect('focus_in_event', self.toentry_cursor)
self.tobox.pack_start(self.toentry, False, False, 0)
#a combobox for the to unit
self.tocombo = gtk.combo_box_new_text()
self.tobox.pack_start(self.tocombo, False, False , 0)
#create a box for the go and clear button
self.sendbox = gtk.HBox(True,2)
self.box.pack_end(self.sendbox, False, False, 0)
self.gobutton = gtk.Button('Go')
self.sendbox.pack_start(self.gobutton, True, True, 0)
self.gobutton.connect('clicked', self.convert)
self.clearbutton = gtk.Button('Clear')
self.sendbox.pack_start(self.clearbutton, True, True, 0)
self.clearbutton.connect('clicked', self.clear)
# Display all elements
self.window.show_all()
def main():
gtk.main()
return 0
if __name__ == '__main__':
unitconvert().create_menu()
main()