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 gettext
   7 import logging
   8
   9 import gobject
  10 import gtk
  11 import gtk.glade
  12 import gtk.gdk
  13
  14 import constants
  15 import hildonize
  16 import unit_data
  17
  18
  19 _moduleLogger = logging.getLogger("gonvert_glade")
  20 PROFILE_STARTUP = False
  21 FORCE_HILDON_LIKE = True
  22
  23 gettext.bindtextdomain('gonvert', '/usr/share/locale')
  24 gettext.textdomain('gonvert')
  25 _ = gettext.gettext
  26
  27
  28 def change_menu_label(widgets, labelname, newtext):
  29         item_label = widgets.get_widget(labelname).get_children()[0]
  30         item_label.set_text(newtext)
  31
  32
  33 class Gonvert(object):
  34
  35         _glade_files = [
  36                 os.path.join(os.path.dirname(__file__), "gonvert.glade"),
  37                 os.path.join(os.path.dirname(__file__), "../data/gonvert.glade"),
  38                 os.path.join(os.path.dirname(__file__), "../lib/gonvert.glade"),
  39                 '/usr/lib/gonvert/gonvert.glade',
  40         ]
  41
  42         def __init__(self):
  43                 self._unitDataInCategory = None
  44                 self._unit_sort_direction = False
  45                 self._value_sort_direction = False
  46                 self._units_sort_direction = False
  47                 self._isFullScreen = False
  48
  49                 self._find_result = [] # empty find result list
  50                 self._findIndex = 0 # default to find result number zero
  51
  52                 self._selectedCategoryName = '' # preset to no selected category
  53                 self._defaultUnitForCategory = {} # empty dictionary for later use
  54
  55                 #check to see if glade file is in current directory (user must be
  56                 # running from download untar directory)
  57                 for gladePath in self._glade_files:
  58                         if os.path.isfile(gladePath):
  59                                 homepath = os.path.dirname(gladePath)
  60                                 pixmapspath = "/".join((homepath, "pixmaps"))
  61                                 widgets = gtk.glade.XML(gladePath)
  62                                 break
  63                 else:
  64                         _moduleLogger.error("UI Descriptor not found!")
  65                         gtk.main_quit()
  66                         return
  67
  68                 self._mainWindow = widgets.get_widget('mainWindow')
  69                 self._app = hildonize.get_app_class()()
  70                 self._mainWindow = hildonize.hildonize_window(self._app, self._mainWindow)
  71
  72                 change_menu_label(widgets, 'fileMenuItem', _('File'))
  73                 change_menu_label(widgets, 'exitMenuItem', _('Exit'))
  74                 change_menu_label(widgets, 'toolsMenuItem', _('Tools'))
  75                 change_menu_label(widgets, 'clearSelectionMenuItem', _('Clear selections'))
  76                 change_menu_label(widgets, 'helpMenuItem', _('Help'))
  77                 change_menu_label(widgets, 'aboutMenuItem', _('About'))
  78                 change_menu_label(widgets, 'findButton', _('Find'))
  79
  80                 self._shortlistcheck = widgets.get_widget('shortlistcheck')
  81                 self._toggleShortList = widgets.get_widget('toggleShortList')
  82
  83                 self._categoryView = widgets.get_widget('categoryView')
  84
  85                 self._unitsView = widgets.get_widget('unitsView')
  86                 self._unitsView.set_property('rules_hint', 1)
  87                 self._unitsView_selection = self._unitsView.get_selection()
  88                 if hildonize.IS_HILDON_SUPPORTED or FORCE_HILDON_LIKE:
  89                         self._unitsView.set_headers_visible(False)
  90
  91                 self._unitName = widgets.get_widget('unitName')
  92                 self._unitValue = widgets.get_widget('unitValue')
  93                 self._previousUnitName = widgets.get_widget('previousUnitName')
  94                 self._previousUnitValue = widgets.get_widget('previousUnitValue')
  95                 if hildonize.IS_HILDON_SUPPORTED or FORCE_HILDON_LIKE:
  96                         self._previousUnitName.get_parent().hide()
  97
  98                 self._unitSymbol = widgets.get_widget('unitSymbol')
  99                 self._previousUnitSymbol = widgets.get_widget('previousUnitSymbol')
 100
 101                 self._unitDescription = widgets.get_widget('unitDescription')
 102                 if hildonize.IS_HILDON_SUPPORTED or FORCE_HILDON_LIKE:
 103                         self._unitDescription.get_parent().get_parent().hide()
 104
 105                 self._searchLayout = widgets.get_widget('searchLayout')
 106                 self._searchLayout.hide()
 107                 self._findEntry = widgets.get_widget('findEntry')
 108                 self._findLabel = widgets.get_widget('findLabel')
 109                 self._findButton = widgets.get_widget('findButton')
 110                 ToolTips = gtk.Tooltips()
 111                 ToolTips.set_tip(self._findButton, _(u'Find unit (F6)'))
 112
 113                 #insert a self._categoryColumnumn into the units list even though the heading will not be seen
 114                 renderer = gtk.CellRendererText()
 115                 self._unitNameColumn = gtk.TreeViewColumn(_('Unit Name'), renderer)
 116                 self._unitNameColumn.set_property('resizable', 1)
 117                 self._unitNameColumn.add_attribute(renderer, 'text', 0)
 118                 self._unitNameColumn.set_clickable(True)
 119                 self._unitNameColumn.connect("clicked", self._on_click_unit_column)
 120                 self._unitsView.append_column(self._unitNameColumn)
 121
 122                 self._unitValueColumn = gtk.TreeViewColumn(_('Value'), renderer)
 123                 self._unitValueColumn.set_property('resizable', 1)
 124                 self._unitValueColumn.add_attribute(renderer, 'text', 1)
 125                 self._unitValueColumn.set_clickable(True)
 126                 self._unitValueColumn.connect("clicked", self._on_click_unit_column)
 127                 self._unitsView.append_column(self._unitValueColumn)
 128
 129                 self._unitSymbolColumn = gtk.TreeViewColumn(_('Units'), renderer)
 130                 self._unitSymbolColumn.set_property('resizable', 1)
 131                 self._unitSymbolColumn.add_attribute(renderer, 'text', 2)
 132                 self._unitSymbolColumn.set_clickable(True)
 133                 self._unitSymbolColumn.connect("clicked", self._on_click_unit_column)
 134                 self._unitsView.append_column(self._unitSymbolColumn)
 135
 136                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 137                 self._sortedUnitModel = gtk.TreeModelSort(self._unitModel)
 138                 columns = self._get_column_sort_stuff()
 139                 for columnIndex, (column, sortDirection, col_cmp) in enumerate(columns):
 140                         self._sortedUnitModel.set_sort_func(columnIndex, col_cmp)
 141                 self._unitsView.set_model(self._sortedUnitModel)
 142
 143                 #Insert a column into the category list even though the heading will not be seen
 144                 renderer = gtk.CellRendererText()
 145                 self._categoryColumn = gtk.TreeViewColumn('Title', renderer)
 146                 self._categoryColumn.set_property('resizable', 1)
 147                 self._categoryColumn.add_attribute(renderer, 'text', 0)
 148                 self._categoryView.append_column(self._categoryColumn)
 149
 150                 self._categoryModel = gtk.ListStore(gobject.TYPE_STRING)
 151                 self._categoryView.set_model(self._categoryModel)
 152                 #colourize each row differently for easier reading
 153                 self._categoryView.set_property('rules_hint', 1)
 154
 155                 #Populate the catagories list
 156                 for key in unit_data.UNIT_CATEGORIES:
 157                         iter = self._categoryModel.append()
 158                         self._categoryModel.set(iter, 0, key)
 159
 160                 #--------- connections to GUI ----------------
 161                 dic = {
 162                         "on_exit_menu_activate": self._on_user_exit,
 163                         "on_main_window_destroy": self._on_user_exit,
 164                         "on_categoryView_select_row": self._on_click_category,
 165                         "on_unitValue_changed": self._on_unit_value_changed,
 166                         "on_previousUnitValue_changed": self._on_previous_unit_value_changed,
 167                         "on_findButton_clicked": self._on_find_activate,
 168                         "on_findEntry_activated": self._on_find_activate,
 169                         "on_findEntry_changed": self._on_findEntry_changed,
 170                         "on_aboutMenuItem_activate": self._on_about_clicked,
 171                         "on_clearSelectionMenuItem_activate": self._on_user_clear_selections,
 172                         "on_unitsView_cursor_changed": self._on_click_unit,
 173                         "on_shortlistcheck_toggled": self._on_shortlist_changed,
 174                         "on_toggleShortList_activate": self._on_edit_shortlist,
 175                 }
 176                 widgets.signal_autoconnect(dic)
 177                 self._mainWindow.connect("key-press-event", self._on_key_press)
 178                 self._mainWindow.connect("window-state-event", self._on_window_state_change)
 179
 180                 self._mainWindow.set_title('gonvert- %s - Unit Conversion Utility' % constants.__version__)
 181                 iconPath = pixmapspath + '/gonvert.png'
 182                 if os.path.exists(iconPath):
 183                         self._mainWindow.set_icon(gtk.gdk.pixbuf_new_from_file(iconPath))
 184                 else:
 185                         _moduleLogger.warn("Error: Could not find gonvert icon: %s" % iconPath)
 186
 187                 self._load_settings()
 188
 189         def _load_settings(self):
 190                 #Restore window size from previously saved settings if it exists and is valid.
 191                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 192                 if os.path.exists(windowDatPath):
 193                         #Retrieving previous window settings from ~/.gonvert/window.dat
 194                         saved_window = pickle.load(open(windowDatPath, "r"))
 195                         #If the 'size' has been stored, then extract size from saved_window.
 196                         if 'size' in saved_window:
 197                                 a, b = saved_window['size']
 198                                 self._mainWindow.resize(a, b)
 199
 200                 #Restore selections from previously saved settings if it exists and is valid.
 201                 historical_catergory_found = False
 202                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 203                 if os.path.exists(selectionsDatPath):
 204                         #Retrieving previous selections from ~/.gonvert/selections.dat
 205                         selections = pickle.load(open(selectionsDatPath, 'r'))
 206                         #Restoring previous selections.
 207                         #If the 'selected_unts' has been stored, then extract self._defaultUnitForCategory from selections.
 208                         if 'selected_units' in selections:
 209                                 self._defaultUnitForCategory = selections['selected_units']
 210                         #Make sure that the 'self._selectedCategoryName' has been stored.
 211                         if 'selected_category' in selections:
 212                                 #Match an available category to the previously selected category.
 213                                 for counter in range(len(unit_data.UNIT_CATEGORIES)):
 214                                         if selections['selected_category'] == unit_data.UNIT_CATEGORIES[counter]:
 215                                                 # Restore the previously selected category.
 216                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
 217                                                 self._categoryView.grab_focus()
 218                                 historical_catergory_found = True
 219
 220                 if not historical_catergory_found:
 221                         print "Couldn't find saved category, using default."
 222                         #If historical records were not kept then default to
 223                         # put the focus on the first category
 224                         self._categoryView.set_cursor(0, self._categoryColumn, False)
 225                         self._categoryView.grab_focus()
 226
 227                 self._select_default_unit()
 228
 229         def _save_settings(self):
 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._selectedCategoryName': full name of selected category
 236                 'self._defaultUnitForCategory': self._defaultUnitForCategory 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._selectedCategoryName = self._categoryModel.get_value(iter, 0)
 242
 243                 selections = {
 244                         'selected_category': self._selectedCategoryName,
 245                         'selected_units': self._defaultUnitForCategory
 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         def _clear_find(self):
 258                 # switch to "new find" state
 259                 self._find_result = []
 260                 self._findIndex = 0
 261
 262                 # Clear our user message
 263                 self._findLabel.set_text('')
 264
 265         def _find_first(self):
 266                 assert len(self._find_result) == 0
 267                 assert self._findIndex == 0
 268                 findString = self._findEntry.get_text().strip().lower()
 269                 if not findString:
 270                         return
 271
 272                 # Gather info on all the matching units from all categories
 273                 for catIndex, category in enumerate(unit_data.UNIT_CATEGORIES):
 274                         units = unit_data.get_units(category)
 275                         for unitIndex, unit in enumerate(units):
 276                                 loweredUnit = unit.lower()
 277                                 if loweredUnit in findString or findString in loweredUnit:
 278                                         self._find_result.append((category, unit, catIndex, unitIndex))
 279
 280         def _update_find_selection(self):
 281                 assert 0 < len(self._find_result)
 282
 283                 #check if next find is in a new category (prevent category changes when unnecessary
 284                 if self._selectedCategoryName != self._find_result[self._findIndex][0]:
 285                         self._categoryView.set_cursor(
 286                                 self._find_result[self._findIndex][2], self._categoryColumn, False
 287                         )
 288
 289                 self._unitsView.set_cursor(
 290                         self._find_result[self._findIndex][3], self._unitNameColumn, True
 291                 )
 292
 293         def _find_next(self):
 294                 if len(self._find_result) == 0:
 295                         self._find_first()
 296                 else:
 297                         if self._findIndex == len(self._find_result)-1:
 298                                 self._findIndex = 0
 299                         else:
 300                                 self._findIndex += 1
 301
 302                 if not self._find_result:
 303                         self._findLabel.set_text('Text not found')
 304                 else:
 305                         self._update_find_selection()
 306                         resultsLeft = len(self._find_result) - self._findIndex - 1
 307                         self._findLabel.set_text(
 308                                 '%s result(s) left' % (resultsLeft, )
 309                         )
 310
 311         def _find_previous(self):
 312                 if len(self._find_result) == 0:
 313                         self._find_first()
 314                 else:
 315                         if self._findIndex == 0:
 316                                 self._findIndex = len(self._find_result)-1
 317                         else:
 318                                 self._findIndex -= 1
 319
 320                 if not self._find_result:
 321                         self._findLabel.set_text('Text not found')
 322                 else:
 323                         self._update_find_selection()
 324                         resultsLeft = len(self._find_result) - self._findIndex - 1
 325                         self._findLabel.set_text(
 326                                 '%s result(s) left' % (resultsLeft, )
 327                         )
 328
 329         def _toggle_find(self):
 330                 if self._searchLayout.get_property("visible"):
 331                         self._searchLayout.hide()
 332                 else:
 333                         self._searchLayout.show()
 334
 335         def _unit_model_cmp(self, sortedModel, leftItr, rightItr):
 336                 leftUnitText = self._unitModel.get_value(leftItr, 0)
 337                 rightUnitText = self._unitModel.get_value(rightItr, 0)
 338                 return cmp(leftUnitText, rightUnitText)
 339
 340         def _symbol_model_cmp(self, sortedModel, leftItr, rightItr):
 341                 leftSymbolText = self._unitModel.get_value(leftItr, 2)
 342                 rightSymbolText = self._unitModel.get_value(rightItr, 2)
 343                 return cmp(leftSymbolText, rightSymbolText)
 344
 345         def _value_model_cmp(self, sortedModel, leftItr, rightItr):
 346                 #special sorting exceptions for ascii values (instead of float values)
 347                 if self._selectedCategoryName == "Computer Numbers":
 348                         leftValue = self._unitModel.get_value(leftItr, 1)
 349                         rightValue = self._unitModel.get_value(rightItr, 1)
 350                 else:
 351                         leftValueText = self._unitModel.get_value(leftItr, 1)
 352                         leftValue = float(leftValueText) if leftValueText else 0.0
 353
 354                         rightValueText = self._unitModel.get_value(rightItr, 1)
 355                         rightValue = float(rightValueText) if rightValueText else 0.0
 356                 return cmp(leftValue, rightValue)
 357
 358         def _get_column_sort_stuff(self):
 359                 columns = (
 360                         (self._unitNameColumn, "_unit_sort_direction", self._unit_model_cmp),
 361                         (self._unitValueColumn, "_value_sort_direction", self._value_model_cmp),
 362                         (self._unitSymbolColumn, "_units_sort_direction", self._symbol_model_cmp),
 363                 )
 364                 return columns
 365
 366         def _switch_category(self, category):
 367                 self._selectedCategoryName = category
 368                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[self._selectedCategoryName]
 369
 370                 #Fill up the units descriptions and clear the value cells
 371                 self._clear_visible_unit_data()
 372                 for key in unit_data.get_units(self._selectedCategoryName):
 373                         iter = self._unitModel.append()
 374                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
 375                 self._sortedUnitModel.sort_column_changed()
 376
 377                 self._select_default_unit()
 378
 379         def _clear_visible_unit_data(self):
 380                 self._unitDescription.get_buffer().set_text("")
 381                 self._unitName.set_text('')
 382                 self._unitValue.set_text('')
 383                 self._unitSymbol.set_text('')
 384
 385                 self._previousUnitName.set_text('')
 386                 self._previousUnitValue.set_text('')
 387                 self._previousUnitSymbol.set_text('')
 388
 389                 self._unitModel.clear()
 390
 391         def _select_default_unit(self):
 392                 # Restore the previous historical settings of previously selected units
 393                 # in this newly selected category
 394                 defaultPrimary = unit_data.get_base_unit(self._selectedCategoryName)
 395                 defaultSecondary = ""
 396                 if self._selectedCategoryName in self._defaultUnitForCategory:
 397                         if self._defaultUnitForCategory[self._selectedCategoryName][0]:
 398                                 defaultPrimary = self._defaultUnitForCategory[self._selectedCategoryName][0]
 399                         if self._defaultUnitForCategory[self._selectedCategoryName][1]:
 400                                 defaultSecondary = self._defaultUnitForCategory[self._selectedCategoryName][1]
 401
 402                 units = unit_data.get_units(self._selectedCategoryName)
 403
 404                 #Restore oldest selection first.
 405                 if defaultPrimary:
 406                         unitIndex = units.index(defaultPrimary)
 407                         self._unitsView.set_cursor(unitIndex, self._unitNameColumn, True)
 408
 409                 #Restore newest selection second.
 410                 if defaultSecondary:
 411                         unitIndex = units.index(defaultSecondary)
 412                         self._unitsView.set_cursor(unitIndex, self._unitNameColumn, True)
 413
 414                 # select the text so user can start typing right away
 415                 self._unitValue.grab_focus()
 416                 self._unitValue.select_region(0, -1)
 417
 418         def _sanitize_value(self, userEntry):
 419                 if self._selectedCategoryName == "Computer Numbers":
 420                         if userEntry == '':
 421                                 value = '0'
 422                         else:
 423                                 value = userEntry
 424                 else:
 425                         if userEntry == '':
 426                                 value = 0.0
 427                         else:
 428                                 value = float(userEntry)
 429                 return value
 430
 431         def _on_shortlist_changed(self, *args):
 432                 try:
 433                         raise NotImplementedError("%s" % self._shortlistcheck.get_active())
 434                 except Exception:
 435                         _moduleLogger.exception("")
 436
 437         def _on_edit_shortlist(self, *args):
 438                 try:
 439                         raise NotImplementedError("%s" % self._toggleShortList.get_active())
 440                 except Exception:
 441                         _moduleLogger.exception("")
 442
 443         def _on_user_clear_selections(self, *args):
 444                 try:
 445                         selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 446                         os.remove(selectionsDatPath)
 447                         self._defaultUnitForCategory = {}
 448                 except Exception:
 449                         _moduleLogger.exception("")
 450
 451         def _on_key_press(self, widget, event, *args):
 452                 """
 453                 @note Hildon specific
 454                 """
 455                 RETURN_TYPES = (gtk.keysyms.Return, gtk.keysyms.ISO_Enter, gtk.keysyms.KP_Enter)
 456                 try:
 457                         if (
 458                                 event.keyval == gtk.keysyms.F6 or
 459                                 event.keyval in RETURN_TYPES and event.get_state() & gtk.gdk.CONTROL_MASK
 460                         ):
 461                                 if self._isFullScreen:
 462                                         self._mainWindow.unfullscreen()
 463                                 else:
 464                                         self._mainWindow.fullscreen()
 465                         elif event.keyval == gtk.keysyms.f and event.get_state() & gtk.gdk.CONTROL_MASK:
 466                                 self._toggle_find()
 467                         elif event.keyval == gtk.keysyms.p and event.get_state() & gtk.gdk.CONTROL_MASK:
 468                                 self._find_previous()
 469                         elif event.keyval == gtk.keysyms.n and event.get_state() & gtk.gdk.CONTROL_MASK:
 470                                 self._find_next()
 471                 except Exception, e:
 472                         _moduleLogger.exception("")
 473
 474         def _on_window_state_change(self, widget, event, *args):
 475                 """
 476                 @note Hildon specific
 477                 """
 478                 try:
 479                         if event.new_window_state & gtk.gdk.WINDOW_STATE_FULLSCREEN:
 480                                 self._isFullScreen = True
 481                         else:
 482                                 self._isFullScreen = False
 483                 except Exception, e:
 484                         _moduleLogger.exception("")
 485
 486         def _on_findEntry_changed(self, *args):
 487                 """
 488                 Clear out find results since the user wants to look for something new
 489                 """
 490                 try:
 491                         self._clear_find()
 492                 except Exception:
 493                         _moduleLogger.exception("")
 494
 495         def _on_find_activate(self, *args):
 496                 try:
 497                         self._find_next()
 498                         self._findButton.grab_focus()
 499                 except Exception:
 500                         _moduleLogger.exception("")
 501
 502         def _on_click_unit_column(self, col):
 503                 """
 504                 Sort the contents of the col when the user clicks on the title.
 505                 """
 506                 try:
 507                         #Determine which column requires sorting
 508                         columns = self._get_column_sort_stuff()
 509                         for columnIndex, (maybeCol, directionName, col_cmp) in enumerate(columns):
 510                                 if col is maybeCol:
 511                                         direction = getattr(self, directionName)
 512                                         gtkDirection = gtk.SORT_ASCENDING if direction else gtk.SORT_DESCENDING
 513
 514                                         # cause a sort
 515                                         self._sortedUnitModel.set_sort_column_id(columnIndex, gtkDirection)
 516
 517                                         # set the visual for sorting
 518                                         col.set_sort_indicator(True)
 519                                         col.set_sort_order(not direction)
 520
 521                                         setattr(self, directionName, not direction)
 522                                         break
 523                                 else:
 524                                         maybeCol.set_sort_indicator(False)
 525                         else:
 526                                 assert False, "Unknown column: %s" % (col.get_title(), )
 527                 except Exception:
 528                         _moduleLogger.exception("")
 529
 530         def _on_click_category(self, *args):
 531                 try:
 532                         selected, iter = self._categoryView.get_selection().get_selected()
 533                         if iter is None:
 534                                 # User is typing in an invalid string, not selecting any category
 535                                 return
 536                         selectedCategory = self._categoryModel.get_value(iter, 0)
 537                         self._switch_category(selectedCategory)
 538                 except Exception:
 539                         _moduleLogger.exception("")
 540
 541         def _on_click_unit(self, *args):
 542                 try:
 543                         selected, iter = self._unitsView.get_selection().get_selected()
 544                         selected_unit = selected.get_value(iter, 0)
 545                         unit_spec = self._unitDataInCategory[selected_unit]
 546
 547                         if self._unitName.get_text() != selected_unit:
 548                                 self._previousUnitName.set_text(self._unitName.get_text())
 549                                 self._previousUnitValue.set_text(self._unitValue.get_text())
 550                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
 551
 552                         self._unitName.set_text(selected_unit)
 553                         self._unitValue.set_text(selected.get_value(iter, 1))
 554                         buffer = self._unitDescription.get_buffer()
 555                         buffer.set_text(unit_spec[2])
 556                         self._unitSymbol.set_text(unit_spec[1]) # put units into label text
 557                         if unit_spec[1]:
 558                                 self._unitSymbol.show()
 559                         else:
 560                                 self._unitSymbol.hide()
 561
 562                         if self._unitValue.get_text() == '':
 563                                 if self._selectedCategoryName == "Computer Numbers":
 564                                         self._unitValue.set_text("0")
 565                                 else:
 566                                         self._unitValue.set_text("0.0")
 567
 568                         self._defaultUnitForCategory[self._selectedCategoryName] = [
 569                                 self._unitName.get_text(), self._previousUnitName.get_text()
 570                         ]
 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                 except Exception:
 576                         _moduleLogger.exception("")
 577
 578         def _on_unit_value_changed(self, *args):
 579                 try:
 580                         if self._unitName.get_text() == '':
 581                                 return
 582                         if not self._unitValue.is_focus():
 583                                 return
 584
 585                         #retrieve the conversion function and value from the selected unit
 586                         value = self._sanitize_value(self._unitValue.get_text())
 587                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 588                         base = func.to_base(value, arg)
 589
 590                         #point to the first row
 591                         for row in self._unitModel:
 592                                 func, arg = self._unitDataInCategory[row[0]][0]
 593                                 row[1] = str(func.from_base(base, arg))
 594
 595                         # Update the secondary unit entry
 596                         if self._previousUnitName.get_text() != '':
 597                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 598                                 self._previousUnitValue.set_text(str(func.from_base(base, arg, )))
 599                 except Exception:
 600                         _moduleLogger.exception("")
 601
 602         def _on_previous_unit_value_changed(self, *args):
 603                 try:
 604                         if self._previousUnitName.get_text() == '':
 605                                 return
 606                         if not self._previousUnitValue.is_focus():
 607                                 return
 608
 609                         #retrieve the conversion function and value from the selected unit
 610                         value = self._sanitize_value(self._previousUnitValue.get_text())
 611                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 612                         base = func.to_base(value, arg)
 613
 614                         #point to the first row
 615                         for row in self._unitModel:
 616                                 func, arg = self._unitDataInCategory[row[0]][0]
 617                                 row[1] = str(func.from_base(base, arg))
 618
 619                         # Update the primary unit entry
 620                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 621                         self._unitValue.set_text(str(func.from_base(base, arg, )))
 622                 except Exception:
 623                         _moduleLogger.exception("")
 624
 625         def _on_about_clicked(self, a):
 626                 dlg = gtk.AboutDialog()
 627                 dlg.set_name(constants.__pretty_app_name__)
 628                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
 629                 dlg.set_copyright("Copyright 2009 - GPL")
 630                 dlg.set_comments("")
 631                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
 632                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
 633                 dlg.run()
 634                 dlg.destroy()
 635
 636         def _on_user_exit(self, *args):
 637                 try:
 638                         self._save_settings()
 639                 except Exception:
 640                         _moduleLogger.exception("")
 641                 finally:
 642                         gtk.main_quit()
 643
 644
 645 def main():
 646         logging.basicConfig(level = logging.DEBUG)
 647         try:
 648                 os.makedirs(constants._data_path_)
 649         except OSError, e:
 650                 if e.errno != 17:
 651                         raise
 652
 653         gonvert = Gonvert()
 654         if not PROFILE_STARTUP:
 655                 gtk.main()
 656
 657
 658 if __name__ == "__main__":
 659         main()