git.maemo.org Git - gonvert/blob - src/gonvert_glade.py

   1 #!/usr/bin/env python
   2 # -*- coding: UTF8 -*-
   3
   4 import os
   5 import pickle
   6 import string
   7 import gettext
   8 import logging
   9
  10 import gobject
  11 import gtk
  12 import gtk.glade
  13 import gtk.gdk
  14
  15 import constants
  16 import unit_data
  17
  18
  19 _moduleLogger = logging.getLogger("gonvert_glade")
  20 PROFILE_STARTUP = False
  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._unit_sort_direction = False
  44                 self._value_sort_direction = False
  45                 self._units_sort_direction = False
  46                 self._isFullScreen = False
  47
  48                 self._find_result = [] # empty find result list
  49                 self._findIndex = 0 # default to find result number zero
  50
  51                 self._selectedCategoryName = '' # preset to no selected category
  52                 self._defaultUnitForCategory = {} # 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                         _moduleLogger.error("UI Descriptor not found!")
  64                         gtk.main_quit()
  65                         return
  66
  67                 self._mainWindow = widgets.get_widget('mainWindow')
  68
  69                 change_menu_label(widgets, 'fileMenuItem', _('File'))
  70                 change_menu_label(widgets, 'exitMenuItem', _('Exit'))
  71                 change_menu_label(widgets, 'toolsMenuItem', _('Tools'))
  72                 change_menu_label(widgets, 'clearSelectionMenuItem', _('Clear selections'))
  73                 change_menu_label(widgets, 'helpMenuItem', _('Help'))
  74                 change_menu_label(widgets, 'aboutMenuItem', _('About'))
  75                 change_menu_label(widgets, 'findButton', _('Find'))
  76
  77                 self._shortlistcheck = widgets.get_widget('shortlistcheck')
  78                 self._toggleShortList = widgets.get_widget('toggleShortList')
  79
  80                 self._categoryView = widgets.get_widget('categoryView')
  81
  82                 self._unitsView = widgets.get_widget('unitsView')
  83                 self._unitsView.set_property('rules_hint', 1)
  84                 self._unitsView_selection = self._unitsView.get_selection()
  85
  86                 self._unitName = widgets.get_widget('unitName')
  87                 self._unitValue = widgets.get_widget('unitValue')
  88                 self._previousUnitName = widgets.get_widget('previousUnitName')
  89                 self._previousUnitValue = widgets.get_widget('previousUnitValue')
  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._searchLayout = widgets.get_widget('searchLayout')
  97                 self._searchLayout.hide()
  98                 self._findEntry = widgets.get_widget('findEntry')
  99                 self._findLabel = widgets.get_widget('findLabel')
 100                 self._findButton = widgets.get_widget('findButton')
 101                 ToolTips = gtk.Tooltips()
 102                 ToolTips.set_tip(self._findButton, _(u'Find unit (F6)'))
 103
 104                 #insert a self._categoryColumnumn into the units list even though the heading will not be seen
 105                 renderer = gtk.CellRendererText()
 106                 self._unitNameColumn = gtk.TreeViewColumn(_('Unit Name'), renderer)
 107                 self._unitNameColumn.set_property('resizable', 1)
 108                 self._unitNameColumn.add_attribute(renderer, 'text', 0)
 109                 self._unitNameColumn.set_clickable(True)
 110                 self._unitNameColumn.connect("clicked", self._on_click_unit_column)
 111                 self._unitsView.append_column(self._unitNameColumn)
 112
 113                 self._unitValueColumn = gtk.TreeViewColumn(_('Value'), renderer)
 114                 self._unitValueColumn.set_property('resizable', 1)
 115                 self._unitValueColumn.add_attribute(renderer, 'text', 1)
 116                 self._unitValueColumn.set_clickable(True)
 117                 self._unitValueColumn.connect("clicked", self._on_click_unit_column)
 118                 self._unitsView.append_column(self._unitValueColumn)
 119
 120                 self._unitSymbolColumn = gtk.TreeViewColumn(_('Units'), renderer)
 121                 self._unitSymbolColumn.set_property('resizable', 1)
 122                 self._unitSymbolColumn.add_attribute(renderer, 'text', 2)
 123                 self._unitSymbolColumn.set_clickable(True)
 124                 self._unitSymbolColumn.connect("clicked", self._on_click_unit_column)
 125                 self._unitsView.append_column(self._unitSymbolColumn)
 126
 127                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 128                 self._sortedUnitModel = gtk.TreeModelSort(self._unitModel)
 129                 columns = self._get_column_sort_stuff()
 130                 for columnIndex, (column, sortDirection, col_cmp) in enumerate(columns):
 131                         self._sortedUnitModel.set_sort_func(columnIndex, col_cmp)
 132                 self._unitsView.set_model(self._sortedUnitModel)
 133
 134                 #Insert a column into the category list even though the heading will not be seen
 135                 renderer = gtk.CellRendererText()
 136                 self._categoryColumn = gtk.TreeViewColumn('Title', renderer)
 137                 self._categoryColumn.set_property('resizable', 1)
 138                 self._categoryColumn.add_attribute(renderer, 'text', 0)
 139                 self._categoryView.append_column(self._categoryColumn)
 140
 141                 self._categoryModel = gtk.ListStore(gobject.TYPE_STRING)
 142                 self._categoryView.set_model(self._categoryModel)
 143                 #colourize each row differently for easier reading
 144                 self._categoryView.set_property('rules_hint', 1)
 145
 146                 #Populate the catagories list
 147                 for key in unit_data.UNIT_CATEGORIES:
 148                         iter = self._categoryModel.append()
 149                         self._categoryModel.set(iter, 0, key)
 150
 151                 #--------- connections to GUI ----------------
 152                 dic = {
 153                         "on_exit_menu_activate": self._on_user_exit,
 154                         "on_main_window_destroy": self._on_user_exit,
 155                         "on_categoryView_select_row": self._on_click_category,
 156                         "on_unitValue_changed": self._on_unit_value_changed,
 157                         "on_previousUnitValue_changed": self._on_previous_unit_value_changed,
 158                         "on_findButton_clicked": self._on_find_activate,
 159                         "on_findEntry_activated": self._on_find_activate,
 160                         "on_findEntry_changed": self._on_findEntry_changed,
 161                         "on_aboutMenuItem_activate": self._on_about_clicked,
 162                         "on_clearSelectionMenuItem_activate": self._on_user_clear_selections,
 163                         "on_unitsView_cursor_changed": self._on_click_unit,
 164                         "on_shortlistcheck_toggled": self._on_shortlist_changed,
 165                         "on_toggleShortList_activate": self._on_edit_shortlist,
 166                 }
 167                 widgets.signal_autoconnect(dic)
 168                 self._mainWindow.connect("key-press-event", self._on_key_press)
 169                 self._mainWindow.connect("window-state-event", self._on_window_state_change)
 170
 171                 self._mainWindow.set_title('gonvert- %s - Unit Conversion Utility' % constants.__version__)
 172                 iconPath = pixmapspath + '/gonvert.png'
 173                 if os.path.exists(iconPath):
 174                         self._mainWindow.set_icon(gtk.gdk.pixbuf_new_from_file(iconPath))
 175                 else:
 176                         _moduleLogger.warn("Error: Could not find gonvert icon: %s" % iconPath)
 177
 178                 self._load_settings()
 179
 180         def _load_settings(self):
 181                 #Restore window size from previously saved settings if it exists and is valid.
 182                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 183                 if os.path.exists(windowDatPath):
 184                         #Retrieving previous window settings from ~/.gonvert/window.dat
 185                         saved_window = pickle.load(open(windowDatPath, "r"))
 186                         #If the 'size' has been stored, then extract size from saved_window.
 187                         if 'size' in saved_window:
 188                                 a, b = saved_window['size']
 189                                 self._mainWindow.resize(a, b)
 190                         else:
 191                                 #Maximize if no previous size was found
 192                                 #self._mainWindow.maximize()
 193                                 pass
 194                 else:
 195                         #Maximize if no previous window.dat file was found
 196                         #self._mainWindow.maximize()
 197                         pass
 198
 199                 #Restore selections from previously saved settings if it exists and is valid.
 200                 historical_catergory_found = False
 201                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 202                 if os.path.exists(selectionsDatPath):
 203                         #Retrieving previous selections from ~/.gonvert/selections.dat
 204                         selections = pickle.load(open(selectionsDatPath, 'r'))
 205                         #Restoring previous selections.
 206                         #If the 'selected_unts' has been stored, then extract self._defaultUnitForCategory from selections.
 207                         if 'selected_units' in selections:
 208                                 self._defaultUnitForCategory = selections['selected_units']
 209                         #Make sure that the 'self._selectedCategoryName' has been stored.
 210                         if 'selected_category' in selections:
 211                                 #Match an available category to the previously selected category.
 212                                 for counter in range(len(unit_data.UNIT_CATEGORIES)):
 213                                         if selections['selected_category'] == unit_data.UNIT_CATEGORIES[counter]:
 214                                                 # Restore the previously selected category.
 215                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
 216                                                 self._categoryView.grab_focus()
 217                                 historical_catergory_found = True
 218
 219                 if not historical_catergory_found:
 220                         print "Couldn't find saved category, using default."
 221                         #If historical records were not kept then default to
 222                         # put the focus on the first category
 223                         self._categoryView.set_cursor(0, self._categoryColumn, False)
 224                         self._categoryView.grab_focus()
 225
 226                 self._select_default_unit()
 227
 228         def _save_settings(self):
 229                 """
 230                 This routine saves the selections to a file, and
 231                 should therefore only be called when exiting the program.
 232
 233                 Update selections dictionary which consists of the following keys:
 234                 'self._selectedCategoryName': full name of selected category
 235                 'self._defaultUnitForCategory': self._defaultUnitForCategory dictionary which contains:
 236                 [categoryname: #1 displayed unit, #2 displayed unit]
 237                 """
 238                 #Determine the contents of the selected category row
 239                 selected, iter = self._categoryView.get_selection().get_selected()
 240                 self._selectedCategoryName = self._categoryModel.get_value(iter, 0)
 241
 242                 selections = {
 243                         'selected_category': self._selectedCategoryName,
 244                         'selected_units': self._defaultUnitForCategory
 245                 }
 246                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 247                 pickle.dump(selections, open(selectionsDatPath, 'w'))
 248
 249                 #Get last size of app and save it
 250                 window_settings = {
 251                         'size': self._mainWindow.get_size()
 252                 }
 253                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 254                 pickle.dump(window_settings, open(windowDatPath, 'w'))
 255
 256         def _clear_find(self):
 257                 # switch to "new find" state
 258                 self._find_result = []
 259                 self._findIndex = 0
 260
 261                 # Clear our user message
 262                 self._findLabel.set_text('')
 263
 264         def _find_first(self):
 265                 assert len(self._find_result) == 0
 266                 assert self._findIndex == 0
 267                 findString = string.lower(string.strip(self._findEntry.get_text()))
 268                 if not findString:
 269                         return
 270
 271                 # Gather info on all the matching units from all categories
 272                 for catIndex, category in enumerate(unit_data.UNIT_CATEGORIES):
 273                         units = unit_data.get_units(category)
 274                         for unitIndex, unit in enumerate(units):
 275                                 loweredUnit = unit.lower()
 276                                 if loweredUnit in findString or findString in loweredUnit:
 277                                         self._find_result.append((category, unit, catIndex, unitIndex))
 278
 279         def _update_find_selection(self):
 280                 assert 0 < len(self._find_result)
 281
 282                 #check if next find is in a new category (prevent category changes when unnecessary
 283                 if self._selectedCategoryName != self._find_result[self._findIndex][0]:
 284                         self._categoryView.set_cursor(
 285                                 self._find_result[self._findIndex][2], self._categoryColumn, False
 286                         )
 287
 288                 self._unitsView.set_cursor(
 289                         self._find_result[self._findIndex][3], self._unitNameColumn, True
 290                 )
 291
 292         def _find_next(self):
 293                 if len(self._find_result) == 0:
 294                         self._find_first()
 295                 else:
 296                         if self._findIndex == len(self._find_result)-1:
 297                                 self._findIndex = 0
 298                         else:
 299                                 self._findIndex += 1
 300
 301                 if not self._find_result:
 302                         self._findLabel.set_text('Text not found')
 303                 else:
 304                         self._update_find_selection()
 305                         resultsLeft = len(self._find_result) - self._findIndex - 1
 306                         self._findLabel.set_text(
 307                                 '%s result(s) left' % (resultsLeft, )
 308                         )
 309
 310         def _find_previous(self):
 311                 if len(self._find_result) == 0:
 312                         self._find_first()
 313                 else:
 314                         if self._findIndex == 0:
 315                                 self._findIndex = len(self._find_result)-1
 316                         else:
 317                                 self._findIndex -= 1
 318
 319                 if not self._find_result:
 320                         self._findLabel.set_text('Text not found')
 321                 else:
 322                         self._update_find_selection()
 323                         resultsLeft = len(self._find_result) - self._findIndex - 1
 324                         self._findLabel.set_text(
 325                                 '%s result(s) left' % (resultsLeft, )
 326                         )
 327
 328         def _toggle_find(self):
 329                 if self._searchLayout.get_property("visible"):
 330                         self._searchLayout.hide()
 331                 else:
 332                         self._searchLayout.show()
 333
 334         def _unit_model_cmp(self, sortedModel, leftItr, rightItr):
 335                 leftUnitText = self._unitModel.get_value(leftItr, 0)
 336                 rightUnitText = self._unitModel.get_value(rightItr, 0)
 337                 return cmp(leftUnitText, rightUnitText)
 338
 339         def _symbol_model_cmp(self, sortedModel, leftItr, rightItr):
 340                 leftSymbolText = self._unitModel.get_value(leftItr, 2)
 341                 rightSymbolText = self._unitModel.get_value(rightItr, 2)
 342                 return cmp(leftSymbolText, rightSymbolText)
 343
 344         def _value_model_cmp(self, sortedModel, leftItr, rightItr):
 345                 #special sorting exceptions for ascii values (instead of float values)
 346                 if self._selectedCategoryName == "Computer Numbers":
 347                         leftValue = self._unitModel.get_value(leftItr, 1)
 348                         rightValue = self._unitModel.get_value(rightItr, 1)
 349                 else:
 350                         leftValueText = self._unitModel.get_value(leftItr, 1)
 351                         leftValue = float(leftValueText) if leftValueText else 0.0
 352
 353                         rightValueText = self._unitModel.get_value(rightItr, 1)
 354                         rightValue = float(rightValueText) if rightValueText else 0.0
 355                 return cmp(leftValue, rightValue)
 356
 357         def _get_column_sort_stuff(self):
 358                 columns = (
 359                         (self._unitNameColumn, "_unit_sort_direction", self._unit_model_cmp),
 360                         (self._unitValueColumn, "_value_sort_direction", self._value_model_cmp),
 361                         (self._unitSymbolColumn, "_units_sort_direction", self._symbol_model_cmp),
 362                 )
 363                 return columns
 364
 365         def _switch_category(self, category):
 366                 self._selectedCategoryName = category
 367                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[self._selectedCategoryName]
 368
 369                 #Fill up the units descriptions and clear the value cells
 370                 self._clear_visible_unit_data()
 371                 for key in unit_data.get_units(self._selectedCategoryName):
 372                         iter = self._unitModel.append()
 373                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
 374                 self._sortedUnitModel.sort_column_changed()
 375
 376                 self._select_default_unit()
 377
 378         def _clear_visible_unit_data(self):
 379                 self._unitDescription.get_buffer().set_text("")
 380                 self._unitName.set_text('')
 381                 self._unitValue.set_text('')
 382                 self._unitSymbol.set_text('')
 383
 384                 self._previousUnitName.set_text('')
 385                 self._previousUnitValue.set_text('')
 386                 self._previousUnitSymbol.set_text('')
 387
 388                 self._unitModel.clear()
 389
 390         def _select_default_unit(self):
 391                 # Restore the previous historical settings of previously selected units
 392                 # in this newly selected category
 393                 defaultPrimary = unit_data.get_base_unit(self._selectedCategoryName)
 394                 defaultSecondary = ""
 395                 if self._selectedCategoryName in self._defaultUnitForCategory:
 396                         if self._defaultUnitForCategory[self._selectedCategoryName][0]:
 397                                 defaultPrimary = self._defaultUnitForCategory[self._selectedCategoryName][0]
 398                         if self._defaultUnitForCategory[self._selectedCategoryName][1]:
 399                                 defaultSecondary = self._defaultUnitForCategory[self._selectedCategoryName][1]
 400
 401                 units = unit_data.get_units(self._selectedCategoryName)
 402
 403                 #Restore oldest selection first.
 404                 if defaultPrimary:
 405                         unitIndex = units.index(defaultPrimary)
 406                         self._unitsView.set_cursor(unitIndex, self._unitNameColumn, True)
 407
 408                 #Restore newest selection second.
 409                 if defaultSecondary:
 410                         unitIndex = units.index(defaultSecondary)
 411                         self._unitsView.set_cursor(unitIndex, self._unitNameColumn, True)
 412
 413                 # select the text so user can start typing right away
 414                 self._unitValue.grab_focus()
 415                 self._unitValue.select_region(0, -1)
 416
 417         def _sanitize_value(self, userEntry):
 418                 if self._selectedCategoryName == "Computer Numbers":
 419                         if userEntry == '':
 420                                 value = '0'
 421                         else:
 422                                 value = userEntry
 423                 else:
 424                         if userEntry == '':
 425                                 value = 0.0
 426                         else:
 427                                 value = float(userEntry)
 428                 return value
 429
 430         def _on_shortlist_changed(self, *args):
 431                 try:
 432                         raise NotImplementedError("%s" % self._shortlistcheck.get_active())
 433                 except Exception:
 434                         _moduleLogger.exception("")
 435
 436         def _on_edit_shortlist(self, *args):
 437                 try:
 438                         raise NotImplementedError("%s" % self._toggleShortList.get_active())
 439                 except Exception:
 440                         _moduleLogger.exception("")
 441
 442         def _on_user_clear_selections(self, *args):
 443                 try:
 444                         selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 445                         os.remove(selectionsDatPath)
 446                         self._defaultUnitForCategory = {}
 447                 except Exception:
 448                         _moduleLogger.exception("")
 449
 450         def _on_key_press(self, widget, event, *args):
 451                 """
 452                 @note Hildon specific
 453                 """
 454                 RETURN_TYPES = (gtk.keysyms.Return, gtk.keysyms.ISO_Enter, gtk.keysyms.KP_Enter)
 455                 try:
 456                         if (
 457                                 event.keyval == gtk.keysyms.F6 or
 458                                 event.keyval in RETURN_TYPES and event.get_state() & gtk.gdk.CONTROL_MASK
 459                         ):
 460                                 if self._isFullScreen:
 461                                         self._mainWindow.unfullscreen()
 462                                 else:
 463                                         self._mainWindow.fullscreen()
 464                         elif event.keyval == gtk.keysyms.f and event.get_state() & gtk.gdk.CONTROL_MASK:
 465                                 self._toggle_find()
 466                         elif event.keyval == gtk.keysyms.p and event.get_state() & gtk.gdk.CONTROL_MASK:
 467                                 self._find_previous()
 468                         elif event.keyval == gtk.keysyms.n and event.get_state() & gtk.gdk.CONTROL_MASK:
 469                                 self._find_next()
 470                 except Exception, e:
 471                         _moduleLogger.exception("")
 472
 473         def _on_window_state_change(self, widget, event, *args):
 474                 """
 475                 @note Hildon specific
 476                 """
 477                 try:
 478                         if event.new_window_state & gtk.gdk.WINDOW_STATE_FULLSCREEN:
 479                                 self._isFullScreen = True
 480                         else:
 481                                 self._isFullScreen = False
 482                 except Exception, e:
 483                         _moduleLogger.exception("")
 484
 485         def _on_findEntry_changed(self, *args):
 486                 """
 487                 Clear out find results since the user wants to look for something new
 488                 """
 489                 try:
 490                         self._clear_find()
 491                 except Exception:
 492                         _moduleLogger.exception("")
 493
 494         def _on_find_activate(self, *args):
 495                 try:
 496                         self._find_next()
 497                         self._findButton.grab_focus()
 498                 except Exception:
 499                         _moduleLogger.exception("")
 500
 501         def _on_click_unit_column(self, col):
 502                 """
 503                 Sort the contents of the col when the user clicks on the title.
 504                 """
 505                 try:
 506                         #Determine which column requires sorting
 507                         columns = self._get_column_sort_stuff()
 508                         for columnIndex, (maybeCol, directionName, col_cmp) in enumerate(columns):
 509                                 if col is maybeCol:
 510                                         direction = getattr(self, directionName)
 511                                         gtkDirection = gtk.SORT_ASCENDING if direction else gtk.SORT_DESCENDING
 512
 513                                         # cause a sort
 514                                         self._sortedUnitModel.set_sort_column_id(columnIndex, gtkDirection)
 515
 516                                         # set the visual for sorting
 517                                         col.set_sort_indicator(True)
 518                                         col.set_sort_order(not direction)
 519
 520                                         setattr(self, directionName, not direction)
 521                                         break
 522                                 else:
 523                                         maybeCol.set_sort_indicator(False)
 524                         else:
 525                                 assert False, "Unknown column: %s" % (col.get_title(), )
 526                 except Exception:
 527                         _moduleLogger.exception("")
 528
 529         def _on_click_category(self, *args):
 530                 try:
 531                         selected, iter = self._categoryView.get_selection().get_selected()
 532                         if iter is None:
 533                                 # User is typing in an invalid string, not selecting any category
 534                                 return
 535                         selectedCategory = self._categoryModel.get_value(iter, 0)
 536                         self._switch_category(selectedCategory)
 537                 except Exception:
 538                         _moduleLogger.exception("")
 539
 540         def _on_click_unit(self, *args):
 541                 try:
 542                         selected, iter = self._unitsView.get_selection().get_selected()
 543                         selected_unit = selected.get_value(iter, 0)
 544                         unit_spec = self._unitDataInCategory[selected_unit]
 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                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
 550
 551                         self._unitName.set_text(selected_unit)
 552                         self._unitValue.set_text(selected.get_value(iter, 1))
 553                         buffer = self._unitDescription.get_buffer()
 554                         buffer.set_text(unit_spec[2])
 555                         self._unitSymbol.set_text(unit_spec[1]) # put units into label text
 556
 557                         if self._unitValue.get_text() == '':
 558                                 if self._selectedCategoryName == "Computer Numbers":
 559                                         self._unitValue.set_text("0")
 560                                 else:
 561                                         self._unitValue.set_text("0.0")
 562
 563                         self._defaultUnitForCategory[self._selectedCategoryName] = [
 564                                 self._unitName.get_text(), self._previousUnitName.get_text()
 565                         ]
 566
 567                         # select the text so user can start typing right away
 568                         self._unitValue.grab_focus()
 569                         self._unitValue.select_region(0, -1)
 570                 except Exception:
 571                         _moduleLogger.exception("")
 572
 573         def _on_unit_value_changed(self, *args):
 574                 try:
 575                         if self._unitName.get_text() == '':
 576                                 return
 577                         if not self._unitValue.is_focus():
 578                                 return
 579
 580                         #retrieve the conversion function and value from the selected unit
 581                         value = self._sanitize_value(self._unitValue.get_text())
 582                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 583                         base = func.to_base(value, arg)
 584
 585                         #point to the first row
 586                         for row in self._unitModel:
 587                                 func, arg = self._unitDataInCategory[row[0]][0]
 588                                 row[1] = str(func.from_base(base, arg))
 589
 590                         # Update the secondary unit entry
 591                         if self._previousUnitName.get_text() != '':
 592                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 593                                 self._previousUnitValue.set_text(str(func.from_base(base, arg, )))
 594                 except Exception:
 595                         _moduleLogger.exception("")
 596
 597         def _on_previous_unit_value_changed(self, *args):
 598                 try:
 599                         if self._previousUnitName.get_text() == '':
 600                                 return
 601                         if not self._previousUnitValue.is_focus():
 602                                 return
 603
 604                         #retrieve the conversion function and value from the selected unit
 605                         value = self._sanitize_value(self._previousUnitValue.get_text())
 606                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 607                         base = func.to_base(value, arg)
 608
 609                         #point to the first row
 610                         for row in self._unitModel:
 611                                 func, arg = self._unitDataInCategory[row[0]][0]
 612                                 row[1] = str(func.from_base(base, arg))
 613
 614                         # Update the primary unit entry
 615                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 616                         self._unitValue.set_text(str(func.from_base(base, arg, )))
 617                 except Exception:
 618                         _moduleLogger.exception("")
 619
 620         def _on_about_clicked(self, a):
 621                 dlg = gtk.AboutDialog()
 622                 dlg.set_name(constants.__pretty_app_name__)
 623                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
 624                 dlg.set_copyright("Copyright 2009 - GPL")
 625                 dlg.set_comments("")
 626                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
 627                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
 628                 dlg.run()
 629                 dlg.destroy()
 630
 631         def _on_user_exit(self, *args):
 632                 try:
 633                         self._save_settings()
 634                 except Exception:
 635                         _moduleLogger.exception("")
 636                 finally:
 637                         gtk.main_quit()
 638
 639
 640 def main():
 641         logging.basicConfig(level = logging.DEBUG)
 642         try:
 643                 os.makedirs(constants._data_path_)
 644         except OSError, e:
 645                 if e.errno != 17:
 646                         raise
 647
 648         gonvert = Gonvert()
 649         if not PROFILE_STARTUP:
 650                 gtk.main()
 651
 652
 653 if __name__ == "__main__":
 654         main()