bbb4482074457465441a12e4038f122cda04b078
[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_find_activate,
152                         "on_findEntry_activated": self._on_find_activate,
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                 self._load_settings()
172
173         def _load_settings(self):
174                 #Restore window size from previously saved settings if it exists and is valid.
175                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
176                 if os.path.exists(windowDatPath):
177                         #Retrieving previous window settings from ~/.gonvert/window.dat
178                         saved_window = pickle.load(open(windowDatPath, "r"))
179                         #If the 'size' has been stored, then extract size from saved_window.
180                         if 'size' in saved_window:
181                                 a, b = saved_window['size']
182                                 self._mainWindow.resize(a, b)
183                         else:
184                                 #Maximize if no previous size was found
185                                 #self._mainWindow.maximize()
186                                 pass
187                 else:
188                         #Maximize if no previous window.dat file was found
189                         #self._mainWindow.maximize()
190                         pass
191
192                 #Restore selections from previously saved settings if it exists and is valid.
193                 historical_catergory_found = False
194                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
195                 if os.path.exists(selectionsDatPath):
196                         #Retrieving previous selections from ~/.gonvert/selections.dat
197                         selections = pickle.load(open(selectionsDatPath, 'r'))
198                         #Restoring previous selections.
199                         #If the 'selected_unts' has been stored, then extract self._selected_units from selections.
200                         if 'selected_units' in selections:
201                                 self._selected_units = selections['selected_units']
202                         #Make sure that the 'self._selected_category' has been stored.
203                         if 'selected_category' in selections:
204                                 #Match an available category to the previously selected category.
205                                 for counter in range(len(unit_data.UNIT_CATEGORIES)):
206                                         if selections['selected_category'] == unit_data.UNIT_CATEGORIES[counter]:
207                                                 # Restore the previously selected category.
208                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
209                                                 self._categoryView.grab_focus()
210                                 historical_catergory_found = True
211
212                 if not historical_catergory_found:
213                         print "Couldn't find saved category, using default."
214                         #If historical records were not kept then default to
215                         # put the focus on the first category
216                         self._categoryView.set_cursor(0, self._categoryColumn, False)
217                         self._categoryView.grab_focus()
218
219                 self.restore_units()
220
221         def _save_settings(self):
222                 """
223                 This routine saves the selections to a file, and
224                 should therefore only be called when exiting the program.
225
226                 Update selections dictionary which consists of the following keys:
227                 'self._selected_category': full name of selected category
228                 'self._selected_units': self._selected_units dictionary which contains:
229                 [categoryname: #1 displayed unit, #2 displayed unit]
230                 """
231                 #Determine the contents of the selected category row
232                 selected, iter = self._categoryView.get_selection().get_selected()
233                 self._selected_category = self._categoryModel.get_value(iter, 0)
234
235                 selections = {
236                         'selected_category': self._selected_category,
237                         'selected_units': self._selected_units
238                 }
239                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
240                 pickle.dump(selections, open(selectionsDatPath, 'w'))
241
242                 #Get last size of app and save it
243                 window_settings = {
244                         'size': self._mainWindow.get_size()
245                 }
246                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
247                 pickle.dump(window_settings, open(windowDatPath, 'w'))
248
249         def _on_shortlist_changed(self, a):
250                 try:
251                         raise NotImplementedError("%s" % self._shortlistcheck.get_active())
252                 except Exception:
253                         _moduleLogger.exception()
254
255         def _on_edit_shortlist(self, a):
256                 try:
257                         raise NotImplementedError("%s" % self._toggleShortList.get_active())
258                 except Exception:
259                         _moduleLogger.exception()
260
261         def _on_user_clear_selections(self, a):
262                 try:
263                         selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
264                         os.remove(selectionsDatPath)
265                         self._selected_units = {}
266                 except Exception:
267                         _moduleLogger.exception()
268
269         def _on_user_exit(self, a):
270                 try:
271                         self._save_settings()
272                 except Exception:
273                         _moduleLogger.exception()
274                 finally:
275                         gtk.main_quit()
276
277         def _on_findEntry_changed(self, a):
278                 """
279                 Clear out find results since the user wants to look for something new
280                 """
281                 try:
282                         # switch to "new find" state
283                         self._find_result = []
284                         self._find_count = 0
285
286                         # Clear our user message
287                         self._findLabel.set_text('')
288                 except Exception:
289                         _moduleLogger.exception()
290
291         def _find_first(self):
292                 assert len(self._find_result) == 0
293                 assert self._find_count == 0
294                 findString = string.lower(string.strip(self._findEntry.get_text()))
295                 if not findString:
296                         return
297
298                 # Gather info on all the matching units from all categories
299                 for catIndex, category in enumerate(unit_data.UNIT_CATEGORIES):
300                         units = unit_data.get_units(category)
301                         for unitIndex, unit in enumerate(units):
302                                 loweredUnit = unit.lower()
303                                 if loweredUnit in findString or findString in loweredUnit:
304                                         self._find_result.append((category, unit, catIndex, unitIndex))
305
306                 if not self._find_result:
307                         return
308
309                 self._select_found_unit()
310
311         def _find_wrap_around(self):
312                 assert 0 < len(self._find_result)
313                 assert self._find_count + 1 == len(self._find_result)
314                 #select first result
315                 self._find_count = 0
316                 self._select_found_unit()
317
318         def _find_next(self):
319                 assert 0 < len(self._find_result)
320                 assert self._find_count + 1 < len(self._find_result)
321                 self._find_count += 1
322                 self._select_found_unit()
323
324         def _select_found_unit(self):
325                 assert 0 < len(self._find_result)
326                 #check if next find is in a new category (prevent category changes when unnecessary
327                 if self._selected_category != self._find_result[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
331         def _on_find_activate(self, a):
332                 """
333                 check if 'new find' or 'last find' or 'next-find'
334
335                 new-find = run the find algorithm which also selects the first found unit
336                          = self._find_count = 0 and self._find_result = []
337
338                 last-find = restart from top again
339                           = self._find_count = len(self._find_result)
340
341                 next-find = continue to next found location
342                            = self._find_count = 0 and len(self._find_result)>0
343                 """
344                 try:
345                         if len(self._find_result) == 0:
346                                 self._find_first()
347                         else:
348                                 if self._find_count == len(self._find_result)-1:
349                                         self._find_wrap_around()
350                                 else:
351                                         self._find_next()
352
353                         if not self._find_result:
354                                 self._findLabel.set_text('Text not found')
355                         else:
356                                 resultsLeft = len(self._find_result) - self._find_count - 1
357                                 self._findLabel.set_text(
358                                         '%s result(s) left' % (resultsLeft, )
359                                 )
360                 except Exception:
361                         _moduleLogger.exception()
362
363         def _on_click_unit_column(self, col):
364                 """
365                 Sort the contents of the col when the user clicks on the title.
366                 """
367                 #Determine which column requires sorting
368                 if col is self._unitNameColumn:
369                         selectedUnitColumn = 0
370                         self._unitNameColumn.set_sort_indicator(True)
371                         self._unitValueColumn.set_sort_indicator(False)
372                         self._unitSymbolColumn.set_sort_indicator(False)
373                         self._unitNameColumn.set_sort_order(not self._unit_sort_direction)
374                 elif col is self._unitValueColumn:
375                         selectedUnitColumn = 1
376                         self._unitNameColumn.set_sort_indicator(False)
377                         self._unitValueColumn.set_sort_indicator(True)
378                         self._unitSymbolColumn.set_sort_indicator(False)
379                         self._unitValueColumn.set_sort_order(not self._value_sort_direction)
380                 elif col is self._unitSymbolColumn:
381                         selectedUnitColumn = 2
382                         self._unitNameColumn.set_sort_indicator(False)
383                         self._unitValueColumn.set_sort_indicator(False)
384                         self._unitSymbolColumn.set_sort_indicator(True)
385                         self._unitSymbolColumn.set_sort_order(not self._units_sort_direction)
386                 else:
387                         assert False, "Unknown column: %s" % (col.get_title(), )
388
389                 #declare a spot to hold the sorted list
390                 sorted_list = []
391
392                 #point to the first row
393                 iter = self._unitModel.get_iter_first()
394                 row = 0
395
396                 while iter:
397                         #grab all text from columns for sorting
398
399                         #get the text from each column
400                         unit_text = self._unitModel.get_value(iter, 0)
401                         units_text = self._unitModel.get_value(iter, 2)
402
403                         #do not bother sorting if the value column is empty
404                         if self._unitModel.get_value(iter, 1) == '' and selectedUnitColumn == 1:
405                                 return
406
407                         #special sorting exceptions for ascii values (instead of float values)
408                         if self._selected_category == "Computer Numbers":
409                                 value_text = self._unitModel.get_value(iter, 1)
410                         else:
411                                 if self._unitModel.get_value(iter, 1) == None or self._unitModel.get_value(iter, 1) == '':
412                                         value_text = ''
413                                 else:
414                                         value_text = float(self._unitModel.get_value(iter, 1))
415
416                         if selectedUnitColumn == 0:
417                                 sorted_list.append((unit_text, value_text, units_text))
418                         elif selectedUnitColumn == 1:
419                                 sorted_list.append((value_text, unit_text, units_text))
420                         else:
421                                 sorted_list.append((units_text, value_text, unit_text))
422
423                         #point to the next row in the self._unitModel
424                         iter = self._unitModel.iter_next(iter)
425                         row = row+1
426
427                 #check if no calculations have been made yet (don't bother sorting)
428                 if row == 0:
429                         return
430                 else:
431                         if selectedUnitColumn == 0:
432                                 if not self._unit_sort_direction:
433                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(x), string.lower(y)))
434                                         self._unit_sort_direction = True
435                                 else:
436                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(y), string.lower(x)))
437                                         self._unit_sort_direction = False
438                         elif selectedUnitColumn == 1:
439                                 sorted_list.sort()
440                                 if not self._value_sort_direction:
441                                         self._value_sort_direction = True
442                                 else:
443                                         sorted_list.reverse()
444                                         self._value_sort_direction = False
445                         else:
446                                 if not self._units_sort_direction:
447                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(x), string.lower(y)))
448                                         self._units_sort_direction = True
449                                 else:
450                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(y), string.lower(x)))
451                                         self._units_sort_direction = False
452
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 differently 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                         if selectedUnitColumn == 0:
465                                 for unit, value, units in sorted_list:
466                                         iter = self._unitModel.append()
467                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
468                         elif selectedUnitColumn == 1:
469                                 for value, unit, units in sorted_list:
470                                         iter = self._unitModel.append()
471                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
472                         else:
473                                 for units, value, unit in sorted_list:
474                                         iter = self._unitModel.append()
475                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
476                 return
477
478         def _on_click_category(self, row):
479                 #Clear out the previous list of units
480                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
481                 self._unitsView.set_model(self._unitModel)
482
483                 #Colourize each row alternately for easier reading
484                 self._unitsView.set_property('rules_hint', 1)
485
486                 #Clear out the description
487                 text_model = gtk.TextBuffer(None)
488                 self._unitDescription.set_buffer(text_model)
489
490                 #Determine the contents of the selected category row
491                 selected, iter = row.get_selection().get_selected()
492
493                 self._selected_category = self._categoryModel.get_value(iter, 0)
494
495                 self._unit_sort_direction = False
496                 self._value_sort_direction = False
497                 self._units_sort_direction = False
498                 self._unitNameColumn.set_sort_indicator(False)
499                 self._unitValueColumn.set_sort_indicator(False)
500                 self._unitSymbolColumn.set_sort_indicator(False)
501
502                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[selected.get_value(iter, 0)]
503                 keys = self._unitDataInCategory.keys()
504                 keys.sort()
505                 del keys[0] # do not display .base_unit description key
506
507                 #Fill up the units descriptions and clear the value cells
508                 for key in keys:
509                         iter = self._unitModel.append()
510                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
511
512                 self._unitName.set_text('')
513                 self._unitValue.set_text('')
514                 self._previousUnitName.set_text('')
515                 self._previousUnitValue.set_text('')
516                 self._unitSymbol.set_text('')
517                 self._previousUnitSymbol.set_text('')
518
519                 self.restore_units()
520
521         def restore_units(self):
522                 # Restore the previous historical settings of previously selected units in this newly selected category
523                 #Since category has just been clicked, the list will be sorted already.
524                 if self._selected_category in self._selected_units:
525                         if self._selected_units[self._selected_category][0]:
526                                 #self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
527
528                                 units = unit_data.UNIT_DESCRIPTIONS[self._selected_category].keys()
529                                 units.sort()
530                                 del units[0] # do not display .base_unit description key
531
532                                 #Restore oldest selection first.
533                                 if self._selected_units[self._selected_category][1]:
534                                         unit_no = 0
535                                         for unit in units:
536                                                 if unit == self._selected_units[self._selected_category][1]:
537                                                         self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
538                                                 unit_no = unit_no+1
539
540                                 #Restore newest selection second.
541                                 unit_no = 0
542                                 for unit in units:
543                                         if unit == self._selected_units[self._selected_category][0]:
544                                                 self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
545                                         unit_no = unit_no+1
546
547                 # select the text so user can start typing right away
548                 self._unitValue.grab_focus()
549                 self._unitValue.select_region(0, -1)
550
551         def _on_button_released(self, row, a):
552                 self._on_click_unit(row)
553
554         def _on_click_unit(self, row):
555                 self._calcsuppress = True #suppress calculations
556
557                 #Determine the contents of the selected row.
558                 selected, iter = self._unitsView.get_selection().get_selected()
559
560                 selected_unit = selected.get_value(iter, 0)
561
562                 unit_spec = self._unitDataInCategory[selected_unit]
563
564                 #Clear out the description
565                 text_model = gtk.TextBuffer(None)
566                 self._unitDescription.set_buffer(text_model)
567
568                 enditer = text_model.get_end_iter()
569                 text_model.insert(enditer, unit_spec[2])
570
571                 if self._unitName.get_text() != selected_unit:
572                         self._previousUnitName.set_text(self._unitName.get_text())
573                         self._previousUnitValue.set_text(self._unitValue.get_text())
574                         if self._unitSymbol.get() == None:
575                                 self._previousUnitSymbol.set_text('')
576                         else:
577                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
578                 self._unitName.set_text(selected_unit)
579
580                 self._unitValue.set_text(selected.get_value(iter, 1))
581
582                 self._unitSymbol.set_text(unit_spec[1]) # put units into label text
583                 if self._unitValue.get_text() == '':
584                         if self._selected_category == "Computer Numbers":
585                                 self._unitValue.set_text("0")
586                         else:
587                                 self._unitValue.set_text("0.0")
588
589                 #For historical purposes, record this unit as the most recent one in this category.
590                 # Also, if a previous unit exists, then shift that previous unit to oldest unit.
591                 if self._selected_category in self._selected_units:
592                         if self._selected_units[self._selected_category][0]:
593                                 self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
594                 else:
595                         self._selected_units[self._selected_category] = [selected_unit, '']
596
597                 # select the text so user can start typing right away
598                 self._unitValue.grab_focus()
599                 self._unitValue.select_region(0, -1)
600
601                 self._calcsuppress = False #enable calculations
602
603         def messagebox_ok_clicked(self, a):
604                 messagebox.hide()
605
606         def _on_user_write_units(self, a):
607                 ''"Write the list of categories and units to stdout for documentation purposes.''"
608                 messagebox_model = gtk.TextBuffer(None)
609                 messageboxtext.set_buffer(messagebox_model)
610                 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)
611                 messagebox.show()
612                 while gtk.events_pending():
613                         gtk.mainiteration(False)
614
615                 total_categories = 0
616                 total_units = 0
617                 print 'gonvert-%s%s' % (
618                         constants.__version__,
619                         _(u' - Unit Conversion Utility  - Convertible units listing: ')
620                 )
621                 for category_key in unit_data.UNIT_CATEGORIES:
622                         total_categories = total_categories + 1
623                         print category_key, ": "
624                         self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[category_key]
625                         unit_keys = self._unitDataInCategory.keys()
626                         unit_keys.sort()
627                         del unit_keys[0] # do not display .base_unit description key
628                         for unit_key in unit_keys:
629                                 total_units = total_units + 1
630                                 print "\t", unit_key
631                 print total_categories, ' categories'
632                 print total_units, ' units'
633
634         def _on_unit_value_changed(self, a):
635                 if self._calcsuppress:
636                         #self._calcsuppress = False
637                         return
638                 # determine if value to be calculated is empty
639                 if self._selected_category == "Computer Numbers":
640                         if self._unitValue.get_text() == '':
641                                 value = '0'
642                         else:
643                                 value = self._unitValue.get_text()
644                 else:
645                         if self._unitValue.get_text() == '':
646                                 value = 0.0
647                         else:
648                                 value = float(self._unitValue.get_text())
649
650                 if self._unitName.get_text() != '':
651                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0] #retrieve the conversion function and value from the selected unit
652                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
653
654                         keys = self._unitDataInCategory.keys()
655                         keys.sort()
656                         del keys[0]
657                         row = 0
658
659                         #point to the first row
660                         iter = self._unitModel.get_iter_first()
661
662                         while iter:
663                                 #get the formula from the name at the row
664                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
665
666                                 #set the result in the value column
667                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
668
669                                 #point to the next row in the self._unitModel
670                                 iter = self._unitModel.iter_next(iter)
671
672                         # if the second row has a unit then update its value
673                         if self._previousUnitName.get_text() != '':
674                                 self._calcsuppress = True
675                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
676                                 self._previousUnitValue.set_text(str(apply(func.from_base, (base, arg, ))))
677                                 self._calcsuppress = False
678
679         def _on_previous_unit_value_changed(self, a):
680                 if self._calcsuppress == True:
681                         #self._calcsuppress = False
682                         return
683                 # determine if value to be calculated is empty
684                 if self._selected_category == "Computer Numbers":
685                         if self._previousUnitValue.get_text() == '':
686                                 value = '0'
687                         else:
688                                 value = self._previousUnitValue.get_text()
689                 else:
690                         if self._previousUnitValue.get_text() == '':
691                                 value = 0.0
692                         else:
693                                 value = float(self._previousUnitValue.get_text())
694
695                 if self._previousUnitName.get_text() != '':
696                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0] #retrieve the conversion function and value from the selected unit
697                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
698
699                         keys = self._unitDataInCategory.keys()
700                         keys.sort()
701                         del keys[0]
702                         row = 0
703
704                         #point to the first row
705                         iter = self._unitModel.get_iter_first()
706
707                         while iter:
708                                 #get the formula from the name at the row
709                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
710
711                                 #set the result in the value column
712                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
713
714                                 #point to the next row in the self._unitModel
715                                 iter = self._unitModel.iter_next(iter)
716
717                         # if the second row has a unit then update its value
718                         if self._unitName.get_text() != '':
719                                 self._calcsuppress = True
720                                 func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
721                                 self._unitValue.set_text(str(apply(func.from_base, (base, arg, ))))
722                                 self._calcsuppress = False
723
724         def _on_about_clicked(self, a):
725                 dlg = gtk.AboutDialog()
726                 dlg.set_name(constants.__pretty_app_name__)
727                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
728                 dlg.set_copyright("Copyright 2009 - GPL")
729                 dlg.set_comments("")
730                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
731                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
732                 dlg.run()
733                 dlg.destroy()
734
735
736 def main():
737         logging.basicConfig(level = logging.DEBUG)
738         try:
739                 os.makedirs(constants._data_path_)
740         except OSError, e:
741                 if e.errno != 17:
742                         raise
743
744         gonvert = Gonvert()
745         gtk.main()
746
747
748 if __name__ == "__main__":
749         main()