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