0f2efacdb4bc3abaeb2627f5a0e02aad831b1598
[gonvert] / src / gonvert_glade.py
1 #!/usr/bin/env python
2 # -*- coding: UTF8 -*-
3
4 import os
5 import pickle
6 import string
7 import sys
8 import gettext
9 import logging
10
11 import gobject
12 import gtk
13 import gtk.glade
14 import gtk.gdk
15
16 import constants
17 import unit_data
18
19
20 _moduleLogger = logging.getLogger("gonvert_glade")
21
22 gettext.bindtextdomain('gonvert', '/usr/share/locale')
23 gettext.textdomain('gonvert')
24 _ = gettext.gettext
25
26
27 def change_menu_label(widgets, labelname, newtext):
28         item_label = widgets.get_widget(labelname).get_children()[0]
29         item_label.set_text(newtext)
30
31
32 class Gonvert(object):
33
34         _glade_files = [
35                 os.path.join(os.path.dirname(__file__), "gonvert.glade"),
36                 os.path.join(os.path.dirname(__file__), "../data/gonvert.glade"),
37                 os.path.join(os.path.dirname(__file__), "../lib/gonvert.glade"),
38                 '/usr/lib/gonvert/gonvert.glade',
39         ]
40
41         def __init__(self):
42                 self._unitDataInCategory = None
43                 self._calcsuppress = False
44                 self._unit_sort_direction = False
45                 self._value_sort_direction = False
46                 self._units_sort_direction = False
47
48                 self._find_result = [] # empty find result list
49                 self._find_count = 0 # default to find result number zero
50
51                 self._selected_category = '' # preset to no selected category
52                 self._selected_units = {} # empty dictionary for later use
53
54                 #check to see if glade file is in current directory (user must be
55                 # running from download untar directory)
56                 for gladePath in self._glade_files:
57                         if os.path.isfile(gladePath):
58                                 homepath = os.path.dirname(gladePath)
59                                 pixmapspath = "/".join((homepath, "pixmaps"))
60                                 widgets = gtk.glade.XML(gladePath)
61                                 break
62                 else:
63                         return
64
65                 self._mainWindow = widgets.get_widget('mainWindow')
66
67                 change_menu_label(widgets, 'fileMenuItem', _('File'))
68                 change_menu_label(widgets, 'exitMenuItem', _('Exit'))
69                 change_menu_label(widgets, 'toolsMenuItem', _('Tools'))
70                 change_menu_label(widgets, 'clearSelectionMenuItem', _('Clear selections'))
71                 change_menu_label(widgets, 'writeUnitsMenuItem', _('Write Units'))
72                 change_menu_label(widgets, 'helpMenuItem', _('Help'))
73                 change_menu_label(widgets, 'aboutMenuItem', _('About'))
74                 change_menu_label(widgets, 'findButton', _('Find'))
75
76                 self._shortlistcheck = widgets.get_widget('shortlistcheck')
77                 self._toggleShortList = widgets.get_widget('toggleShortList')
78
79                 self._categoryView = widgets.get_widget('categoryView')
80
81                 self._unitsView = widgets.get_widget('unitsView')
82                 self._unitsView_selection = self._unitsView.get_selection()
83
84                 self._unitName = widgets.get_widget('unitName')
85                 self._unitValue = widgets.get_widget('unitValue')
86                 self._previousUnitName = widgets.get_widget('previousUnitName')
87                 self._previousUnitValue = widgets.get_widget('previousUnitValue')
88                 messagebox = widgets.get_widget('msgbox')
89                 messageboxtext = widgets.get_widget('msgboxtext')
90
91                 self._unitSymbol = widgets.get_widget('unitSymbol')
92                 self._previousUnitSymbol = widgets.get_widget('previousUnitSymbol')
93
94                 self._unitDescription = widgets.get_widget('unitDescription')
95
96                 self._findEntry = widgets.get_widget('findEntry')
97                 self._findLabel = widgets.get_widget('findLabel')
98                 findButton = widgets.get_widget('findButton')
99                 ToolTips = gtk.Tooltips()
100                 ToolTips.set_tip(findButton, _(u'Find unit (F6)'))
101
102                 #insert a self._categoryColumnumn into the units list even though the heading will not be seen
103                 renderer = gtk.CellRendererText()
104                 self._unitNameColumn = gtk.TreeViewColumn(_('Unit Name'), renderer)
105                 self._unitNameColumn.set_property('resizable', 1)
106                 self._unitNameColumn.add_attribute(renderer, 'text', 0)
107                 self._unitNameColumn.set_clickable(True)
108                 self._unitNameColumn.connect("clicked", self._on_click_unit_column)
109                 self._unitsView.append_column(self._unitNameColumn)
110
111                 self._unitValueColumn = gtk.TreeViewColumn(_('Value'), renderer)
112                 self._unitValueColumn.set_property('resizable', 1)
113                 self._unitValueColumn.add_attribute(renderer, 'text', 1)
114                 self._unitValueColumn.set_clickable(True)
115                 self._unitValueColumn.connect("clicked", self._on_click_unit_column)
116                 self._unitsView.append_column(self._unitValueColumn)
117
118                 self._unitSymbolColumn = gtk.TreeViewColumn(_('Units'), renderer)
119                 self._unitSymbolColumn.set_property('resizable', 1)
120                 self._unitSymbolColumn.add_attribute(renderer, 'text', 2)
121                 self._unitSymbolColumn.set_clickable(True)
122                 self._unitSymbolColumn.connect("clicked", self._on_click_unit_column)
123                 self._unitsView.append_column(self._unitSymbolColumn)
124
125                 #Insert a column into the category list even though the heading will not be seen
126                 renderer = gtk.CellRendererText()
127                 self._categoryColumn = gtk.TreeViewColumn('Title', renderer)
128                 self._categoryColumn.set_property('resizable', 1)
129                 self._categoryColumn.add_attribute(renderer, 'text', 0)
130                 self._categoryView.append_column(self._categoryColumn)
131
132                 self._categoryModel = gtk.ListStore(gobject.TYPE_STRING)
133                 self._categoryView.set_model(self._categoryModel)
134                 #colourize each row differently for easier reading
135                 self._categoryView.set_property('rules_hint', 1)
136
137                 #Populate the catagories list
138                 for key in unit_data.UNIT_CATEGORIES:
139                         iter = self._categoryModel.append()
140                         self._categoryModel.set(iter, 0, key)
141
142                 #--------- connections to GUI ----------------
143                 dic = {
144                         "on_exit_menu_activate": self._on_user_exit,
145                         "on_main_window_destroy": self._on_user_exit,
146                         "on_categoryView_select_row": self._on_click_category,
147                         "on_unitsView__on_click_unit_column": self._on_click_unit_column,
148                         "on_unitValue_changed": self._on_unit_value_changed,
149                         "on_previousUnitValue_changed": self._on_previous_unit_value_changed,
150                         "on_writeUnitsMenuItem_activate": self._on_user_write_units,
151                         "on_findButton_clicked": self._on_user_find_units,
152                         "on_findEntry_activated": self._on_user_find_units,
153                         "on_findEntry_changed": self._on_findEntry_changed,
154                         "on_aboutMenuItem_activate": self._on_about_clicked,
155                         "on_messagebox_ok_clicked": self.messagebox_ok_clicked,
156                         "on_clearSelectionMenuItem_activate": self._on_user_clear_selections,
157                         "on_unitsView_cursor_changed": self._on_click_unit,
158                         "on_unitsView_button_released": self._on_button_released,
159                         "on_shortlistcheck_toggled": self._on_shortlist_changed,
160                         "on_toggleShortList_activate": self._on_edit_shortlist,
161                 }
162                 widgets.signal_autoconnect(dic)
163
164                 self._mainWindow.set_title('gonvert- %s - Unit Conversion Utility' % constants.__version__)
165                 iconPath = pixmapspath + '/gonvert.png'
166                 if os.path.exists(iconPath):
167                         self._mainWindow.set_icon(gtk.gdk.pixbuf_new_from_file(iconPath))
168                 else:
169                         _moduleLogger.warn("Error: Could not find gonvert icon: %s" % iconPath)
170
171                 #Restore window size from previously saved settings if it exists and is valid.
172                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
173                 if os.path.exists(windowDatPath):
174                         #Retrieving previous window settings from ~/.gonvert/window.dat
175                         saved_window = pickle.load(open(windowDatPath, "r"))
176                         #If the 'size' has been stored, then extract size from saved_window.
177                         if 'size' in saved_window:
178                                 a, b = saved_window['size']
179                                 self._mainWindow.resize(a, b)
180                         else:
181                                 #Maximize if no previous size was found
182                                 #self._mainWindow.maximize()
183                                 pass
184                 else:
185                         #Maximize if no previous window.dat file was found
186                         #self._mainWindow.maximize()
187                         pass
188
189                 #Restore selections from previously saved settings if it exists and is valid.
190                 historical_catergory_found = False
191                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
192                 if os.path.exists(selectionsDatPath):
193                         #Retrieving previous selections from ~/.gonvert/selections.dat
194                         selections = pickle.load(open(selectionsDatPath, 'r'))
195                         #Restoring previous selections.
196                         #If the 'selected_unts' has been stored, then extract self._selected_units from selections.
197                         if 'selected_units' in selections:
198                                 self._selected_units = selections['selected_units']
199                         #Make sure that the 'self._selected_category' has been stored.
200                         if 'selected_category' in selections:
201                                 #Match an available category to the previously selected category.
202                                 for counter in range(len(unit_data.UNIT_CATEGORIES)):
203                                         if selections['selected_category'] == unit_data.UNIT_CATEGORIES[counter]:
204                                                 # Restore the previously selected category.
205                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
206                                                 self._categoryView.grab_focus()
207                                 historical_catergory_found = True
208
209                 if not historical_catergory_found:
210                         print "Couldn't find saved category, using default."
211                         #If historical records were not kept then default to
212                         # put the focus on the first category
213                         self._categoryView.set_cursor(0, self._categoryColumn, False)
214                         self._categoryView.grab_focus()
215
216                 self.restore_units()
217
218         def _on_shortlist_changed(self, a):
219                 raise NotImplementedError("%s" % self._shortlistcheck.get_active())
220
221         def _on_edit_shortlist(self, a):
222                 raise NotImplementedError("%s" % self._toggleShortList.get_active())
223
224         def _on_user_clear_selections(self, a):
225                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
226                 os.remove(selectionsDatPath)
227                 self._selected_units = {}
228
229         def _on_user_exit(self, a):
230                 """
231                 This routine saves the selections to a file, and
232                 should therefore only be called when exiting the program.
233
234                 Update selections dictionary which consists of the following keys:
235                 'self._selected_category': full name of selected category
236                 'self._selected_units': self._selected_units dictionary which contains:
237                 [categoryname: #1 displayed unit, #2 displayed unit]
238                 """
239                 #Determine the contents of the selected category row
240                 selected, iter = self._categoryView.get_selection().get_selected()
241                 self._selected_category = self._categoryModel.get_value(iter, 0)
242
243                 selections = {
244                         'selected_category': self._selected_category,
245                         'selected_units': self._selected_units
246                 }
247                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
248                 pickle.dump(selections, open(selectionsDatPath, 'w'))
249
250                 #Get last size of app and save it
251                 window_settings = {
252                         'size': self._mainWindow.get_size()
253                 }
254                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
255                 pickle.dump(window_settings, open(windowDatPath, 'w'))
256
257                 gtk.mainquit
258                 sys.exit()
259
260         def _on_findEntry_changed(self, a):
261                 #Clear out find results since the user wants to look for something new
262                 self._find_result = [] #empty find result list
263                 self._find_count = 0 #default to find result number zero
264                 self._findLabel.set_text('') #clear result
265
266         def _on_about_clicked(self, a):
267                 dlg = gtk.AboutDialog()
268                 dlg.set_name(constants.__pretty_app_name__)
269                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
270                 dlg.set_copyright("Copyright 2009 - GPL")
271                 dlg.set_comments("")
272                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
273                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
274                 dlg.run()
275                 dlg.destroy()
276
277         def messagebox_ok_clicked(self, a):
278                 messagebox.hide()
279
280         def _on_user_find_units(self, a):
281                 #check if 'new find' or 'last find' or 'next-find'
282
283                 #new-find = run the find algorithm which also selects the first found unit
284                 #         = self._find_count = 0 and self._find_result = []
285
286                 #last-find = restart from top again
287                 #          = self._find_count = len(self._find_result)
288
289                 #next-find = continue to next found location
290                 #           = self._find_count = 0 and len(self._find_result)>0
291
292                 #check for new-find
293                 if len(self._find_result) == 0:
294                         find_string = string.lower(string.strip(self._findEntry.get_text()))
295                         #Make sure that a valid find string has been requested
296                         if len(find_string)>0:
297                                 found_a_unit = 0 #reset the 'found-a-unit' flag
298                                 cat_no = 0
299                                 for category in unit_data.UNIT_CATEGORIES:
300                                         units = unit_data.UNIT_DESCRIPTIONS[category].keys()
301                                         units.sort()
302                                         del units[0] # do not display .base_unit description key
303                                         unit_no = 0
304                                         for unit in units:
305                                                 if string.find(string.lower(unit), find_string) >= 0:
306                                                         found_a_unit = 1 #indicate that a unit was found
307                                                         #print "'", find_string, "'", " found at category = ", category, " unit = ", unit
308                                                         self._find_result.append((category, unit, cat_no, unit_no))
309                                                 unit_no = unit_no+1
310                                         cat_no = cat_no+1
311
312                                 if found_a_unit == 1:
313                                         #select the first found unit
314                                         self._find_count = 0
315                                         #check if next find is in a new category (prevent category changes when unnecessary
316                                         if self._selected_category != self._find_result[self._find_count][0]:
317                                                 self._categoryView.set_cursor(self._find_result[0][2], self._categoryColumn, False)
318                                                 self._unitsView.set_cursor(self._find_result[0][3], self._unitNameColumn, True)
319                                                 if len(self._find_result)>1:
320                                                         self._findLabel.set_text(('Press Find for next unit. '+ str(len(self._find_result))+' result(s).'))
321                                                 else:
322                                                         self._findLabel.set_text('Text not found') #Display error
323                 else: #must be next-find or last-find
324                         #check for last-find
325                         if self._find_count == len(self._find_result)-1:
326                                 #select first result
327                                 self._find_count = 0
328                                 self._categoryView.set_cursor(self._find_result[self._find_count][2], self._categoryColumn, False)
329                                 self._unitsView.set_cursor(self._find_result[self._find_count][3], self._unitNameColumn, True)
330                         else: #must be next-find
331                                 self._find_count = self._find_count+1
332                                 #check if next find is in a new category (prevent category changes when unnecessary
333                                 if self._selected_category != self._find_result[self._find_count][0]:
334                                         self._categoryView.set_cursor(self._find_result[self._find_count][2], self._categoryColumn, False)
335                                 self._unitsView.set_cursor(self._find_result[self._find_count][3], self._unitNameColumn, True)
336
337         def _on_click_unit_column(self, col):
338                 """
339                 Sort the contents of the col when the user clicks on the title.
340                 """
341                 #Determine which column requires sorting
342                 if col is self._unitNameColumn:
343                         selectedUnitColumn = 0
344                         self._unitNameColumn.set_sort_indicator(True)
345                         self._unitValueColumn.set_sort_indicator(False)
346                         self._unitSymbolColumn.set_sort_indicator(False)
347                         self._unitNameColumn.set_sort_order(not self._unit_sort_direction)
348                 elif col is self._unitValueColumn:
349                         selectedUnitColumn = 1
350                         self._unitNameColumn.set_sort_indicator(False)
351                         self._unitValueColumn.set_sort_indicator(True)
352                         self._unitSymbolColumn.set_sort_indicator(False)
353                         self._unitValueColumn.set_sort_order(not self._value_sort_direction)
354                 elif col is self._unitSymbolColumn:
355                         selectedUnitColumn = 2
356                         self._unitNameColumn.set_sort_indicator(False)
357                         self._unitValueColumn.set_sort_indicator(False)
358                         self._unitSymbolColumn.set_sort_indicator(True)
359                         self._unitSymbolColumn.set_sort_order(not self._units_sort_direction)
360                 else:
361                         assert False, "Unknown column: %s" % (col.get_title(), )
362
363                 #declare a spot to hold the sorted list
364                 sorted_list = []
365
366                 #point to the first row
367                 iter = self._unitModel.get_iter_first()
368                 row = 0
369
370                 while iter:
371                         #grab all text from columns for sorting
372
373                         #get the text from each column
374                         unit_text = self._unitModel.get_value(iter, 0)
375                         units_text = self._unitModel.get_value(iter, 2)
376
377                         #do not bother sorting if the value column is empty
378                         if self._unitModel.get_value(iter, 1) == '' and selectedUnitColumn == 1:
379                                 return
380
381                         #special sorting exceptions for ascii values (instead of float values)
382                         if self._selected_category == "Computer Numbers":
383                                 value_text = self._unitModel.get_value(iter, 1)
384                         else:
385                                 if self._unitModel.get_value(iter, 1) == None or self._unitModel.get_value(iter, 1) == '':
386                                         value_text = ''
387                                 else:
388                                         value_text = float(self._unitModel.get_value(iter, 1))
389
390                         if selectedUnitColumn == 0:
391                                 sorted_list.append((unit_text, value_text, units_text))
392                         elif selectedUnitColumn == 1:
393                                 sorted_list.append((value_text, unit_text, units_text))
394                         else:
395                                 sorted_list.append((units_text, value_text, unit_text))
396
397                         #point to the next row in the self._unitModel
398                         iter = self._unitModel.iter_next(iter)
399                         row = row+1
400
401                 #check if no calculations have been made yet (don't bother sorting)
402                 if row == 0:
403                         return
404                 else:
405                         if selectedUnitColumn == 0:
406                                 if not self._unit_sort_direction:
407                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(x), string.lower(y)))
408                                         self._unit_sort_direction = True
409                                 else:
410                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(y), string.lower(x)))
411                                         self._unit_sort_direction = False
412                         elif selectedUnitColumn == 1:
413                                 sorted_list.sort()
414                                 if not self._value_sort_direction:
415                                         self._value_sort_direction = True
416                                 else:
417                                         sorted_list.reverse()
418                                         self._value_sort_direction = False
419                         else:
420                                 if not self._units_sort_direction:
421                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(x), string.lower(y)))
422                                         self._units_sort_direction = True
423                                 else:
424                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(y), string.lower(x)))
425                                         self._units_sort_direction = False
426
427                         #Clear out the previous list of units
428                         self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
429                         self._unitsView.set_model(self._unitModel)
430
431                         #colourize each row differently for easier reading
432                         self._unitsView.set_property('rules_hint', 1)
433
434                         #Clear out the description
435                         text_model = gtk.TextBuffer(None)
436                         self._unitDescription.set_buffer(text_model)
437
438                         if selectedUnitColumn == 0:
439                                 for unit, value, units in sorted_list:
440                                         iter = self._unitModel.append()
441                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
442                         elif selectedUnitColumn == 1:
443                                 for value, unit, units in sorted_list:
444                                         iter = self._unitModel.append()
445                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
446                         else:
447                                 for units, value, unit in sorted_list:
448                                         iter = self._unitModel.append()
449                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
450                 return
451
452         def _on_click_category(self, row):
453                 #Clear out the previous list of units
454                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
455                 self._unitsView.set_model(self._unitModel)
456
457                 #Colourize each row alternately for easier reading
458                 self._unitsView.set_property('rules_hint', 1)
459
460                 #Clear out the description
461                 text_model = gtk.TextBuffer(None)
462                 self._unitDescription.set_buffer(text_model)
463
464                 #Determine the contents of the selected category row
465                 selected, iter = row.get_selection().get_selected()
466
467                 self._selected_category = self._categoryModel.get_value(iter, 0)
468
469                 self._unit_sort_direction = False
470                 self._value_sort_direction = False
471                 self._units_sort_direction = False
472                 self._unitNameColumn.set_sort_indicator(False)
473                 self._unitValueColumn.set_sort_indicator(False)
474                 self._unitSymbolColumn.set_sort_indicator(False)
475
476                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[selected.get_value(iter, 0)]
477                 keys = self._unitDataInCategory.keys()
478                 keys.sort()
479                 del keys[0] # do not display .base_unit description key
480
481                 #Fill up the units descriptions and clear the value cells
482                 for key in keys:
483                         iter = self._unitModel.append()
484                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
485
486                 self._unitName.set_text('')
487                 self._unitValue.set_text('')
488                 self._previousUnitName.set_text('')
489                 self._previousUnitValue.set_text('')
490                 self._unitSymbol.set_text('')
491                 self._previousUnitSymbol.set_text('')
492
493                 self.restore_units()
494
495         def restore_units(self):
496                 # Restore the previous historical settings of previously selected units in this newly selected category
497                 #Since category has just been clicked, the list will be sorted already.
498                 if self._selected_category in self._selected_units:
499                         if self._selected_units[self._selected_category][0]:
500                                 ''"debug ''"
501                                 #self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
502
503                                 units = unit_data.UNIT_DESCRIPTIONS[self._selected_category].keys()
504                                 units.sort()
505                                 del units[0] # do not display .base_unit description key
506
507                                 #Restore oldest selection first.
508                                 if self._selected_units[self._selected_category][1]:
509                                         unit_no = 0
510                                         for unit in units:
511                                                 if unit == self._selected_units[self._selected_category][1]:
512                                                         self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
513                                                 unit_no = unit_no+1
514
515                                 #Restore newest selection second.
516                                 unit_no = 0
517                                 for unit in units:
518                                         if unit == self._selected_units[self._selected_category][0]:
519                                                 self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
520                                         unit_no = unit_no+1
521
522                 # select the text so user can start typing right away
523                 self._unitValue.grab_focus()
524                 self._unitValue.select_region(0, -1)
525
526         def _on_button_released(self, row, a):
527                 self._on_click_unit(row)
528
529         def _on_click_unit(self, row):
530                 self._calcsuppress = True #suppress calculations
531
532                 #Determine the contents of the selected row.
533                 selected, iter = self._unitsView.get_selection().get_selected()
534
535                 selected_unit = selected.get_value(iter, 0)
536
537                 unit_spec = self._unitDataInCategory[selected_unit]
538
539                 #Clear out the description
540                 text_model = gtk.TextBuffer(None)
541                 self._unitDescription.set_buffer(text_model)
542
543                 enditer = text_model.get_end_iter()
544                 text_model.insert(enditer, unit_spec[2])
545
546                 if self._unitName.get_text() != selected_unit:
547                         self._previousUnitName.set_text(self._unitName.get_text())
548                         self._previousUnitValue.set_text(self._unitValue.get_text())
549                         if self._unitSymbol.get() == None:
550                                 self._previousUnitSymbol.set_text('')
551                         else:
552                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
553                 self._unitName.set_text(selected_unit)
554
555                 self._unitValue.set_text(selected.get_value(iter, 1))
556
557                 self._unitSymbol.set_text(unit_spec[1]) # put units into label text
558                 if self._unitValue.get_text() == '':
559                         if self._selected_category == "Computer Numbers":
560                                 self._unitValue.set_text("0")
561                         else:
562                                 self._unitValue.set_text("0.0")
563
564                 #For historical purposes, record this unit as the most recent one in this category.
565                 # Also, if a previous unit exists, then shift that previous unit to oldest unit.
566                 if self._selected_category in self._selected_units:
567                         if self._selected_units[self._selected_category][0]:
568                                 self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
569                 else:
570                         self._selected_units[self._selected_category] = [selected_unit, '']
571
572                 # select the text so user can start typing right away
573                 self._unitValue.grab_focus()
574                 self._unitValue.select_region(0, -1)
575
576                 self._calcsuppress = False #enable calculations
577
578         def _on_user_write_units(self, a):
579                 ''"Write the list of categories and units to stdout for documentation purposes.''"
580                 messagebox_model = gtk.TextBuffer(None)
581                 messageboxtext.set_buffer(messagebox_model)
582                 messagebox_model.insert_at_cursor(_(u'The units are being written to stdout. You can capture this printout by starting gonvert from the command line as follows: \n$ gonvert > file.txt'), -1)
583                 messagebox.show()
584                 while gtk.events_pending():
585                         gtk.mainiteration(False)
586
587                 total_categories = 0
588                 total_units = 0
589                 print 'gonvert-%s%s' % (
590                         constants.__version__,
591                         _(u' - Unit Conversion Utility  - Convertible units listing: ')
592                 )
593                 for category_key in unit_data.UNIT_CATEGORIES:
594                         total_categories = total_categories + 1
595                         print category_key, ": "
596                         self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[category_key]
597                         unit_keys = self._unitDataInCategory.keys()
598                         unit_keys.sort()
599                         del unit_keys[0] # do not display .base_unit description key
600                         for unit_key in unit_keys:
601                                 total_units = total_units + 1
602                                 print "\t", unit_key
603                 print total_categories, ' categories'
604                 print total_units, ' units'
605
606         def _on_unit_value_changed(self, a):
607                 if self._calcsuppress:
608                         #self._calcsuppress = False
609                         return
610                 # determine if value to be calculated is empty
611                 if self._selected_category == "Computer Numbers":
612                         if self._unitValue.get_text() == '':
613                                 value = '0'
614                         else:
615                                 value = self._unitValue.get_text()
616                 else:
617                         if self._unitValue.get_text() == '':
618                                 value = 0.0
619                         else:
620                                 value = float(self._unitValue.get_text())
621
622                 if self._unitName.get_text() != '':
623                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0] #retrieve the conversion function and value from the selected unit
624                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
625
626                         keys = self._unitDataInCategory.keys()
627                         keys.sort()
628                         del keys[0]
629                         row = 0
630
631                         #point to the first row
632                         iter = self._unitModel.get_iter_first()
633
634                         while iter:
635                                 #get the formula from the name at the row
636                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
637
638                                 #set the result in the value column
639                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
640
641                                 #point to the next row in the self._unitModel
642                                 iter = self._unitModel.iter_next(iter)
643
644                         # if the second row has a unit then update its value
645                         if self._previousUnitName.get_text() != '':
646                                 self._calcsuppress = True
647                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
648                                 self._previousUnitValue.set_text(str(apply(func.from_base, (base, arg, ))))
649                                 self._calcsuppress = False
650
651         def _on_previous_unit_value_changed(self, a):
652                 if self._calcsuppress == True:
653                         #self._calcsuppress = False
654                         return
655                 # determine if value to be calculated is empty
656                 if self._selected_category == "Computer Numbers":
657                         if self._previousUnitValue.get_text() == '':
658                                 value = '0'
659                         else:
660                                 value = self._previousUnitValue.get_text()
661                 else:
662                         if self._previousUnitValue.get_text() == '':
663                                 value = 0.0
664                         else:
665                                 value = float(self._previousUnitValue.get_text())
666
667                 if self._previousUnitName.get_text() != '':
668                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0] #retrieve the conversion function and value from the selected unit
669                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
670
671                         keys = self._unitDataInCategory.keys()
672                         keys.sort()
673                         del keys[0]
674                         row = 0
675
676                         #point to the first row
677                         iter = self._unitModel.get_iter_first()
678
679                         while iter:
680                                 #get the formula from the name at the row
681                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
682
683                                 #set the result in the value column
684                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
685
686                                 #point to the next row in the self._unitModel
687                                 iter = self._unitModel.iter_next(iter)
688
689                         # if the second row has a unit then update its value
690                         if self._unitName.get_text() != '':
691                                 self._calcsuppress = True
692                                 func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
693                                 self._unitValue.set_text(str(apply(func.from_base, (base, arg, ))))
694                                 self._calcsuppress = False
695
696
697 def main():
698         logging.basicConfig(level = logging.DEBUG)
699         try:
700                 os.makedirs(constants._data_path_)
701         except OSError, e:
702                 if e.errno != 17:
703                         raise
704
705         gonvert = Gonvert()
706         gtk.main()
707
708
709 if __name__ == "__main__":
710         main()