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                 hildonize.set_cell_thumb_selectable(renderer)
 116                 self._unitNameColumn = gtk.TreeViewColumn(_('Unit Name'), renderer)
 117                 self._unitNameColumn.set_property('resizable', 1)
 118                 self._unitNameColumn.add_attribute(renderer, 'text', 0)
 119                 self._unitNameColumn.set_clickable(True)
 120                 self._unitNameColumn.connect("clicked", self._on_click_unit_column)
 121                 self._unitsView.append_column(self._unitNameColumn)
 122
 123                 self._unitValueColumn = gtk.TreeViewColumn(_('Value'), renderer)
 124                 self._unitValueColumn.set_property('resizable', 1)
 125                 self._unitValueColumn.add_attribute(renderer, 'text', 1)
 126                 self._unitValueColumn.set_clickable(True)
 127                 self._unitValueColumn.connect("clicked", self._on_click_unit_column)
 128                 self._unitsView.append_column(self._unitValueColumn)
 129
 130                 self._unitSymbolColumn = gtk.TreeViewColumn(_('Units'), renderer)
 131                 self._unitSymbolColumn.set_property('resizable', 1)
 132                 self._unitSymbolColumn.add_attribute(renderer, 'text', 2)
 133                 self._unitSymbolColumn.set_clickable(True)
 134                 self._unitSymbolColumn.connect("clicked", self._on_click_unit_column)
 135                 self._unitsView.append_column(self._unitSymbolColumn)
 136
 137                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 138                 self._sortedUnitModel = gtk.TreeModelSort(self._unitModel)
 139                 columns = self._get_column_sort_stuff()
 140                 for columnIndex, (column, sortDirection, col_cmp) in enumerate(columns):
 141                         self._sortedUnitModel.set_sort_func(columnIndex, col_cmp)
 142                 self._unitsView.set_model(self._sortedUnitModel)
 143
 144                 #Insert a column into the category list even though the heading will not be seen
 145                 renderer = gtk.CellRendererText()
 146                 self._categoryColumn = gtk.TreeViewColumn('Title', renderer)
 147                 self._categoryColumn.set_property('resizable', 1)
 148                 self._categoryColumn.add_attribute(renderer, 'text', 0)
 149                 self._categoryView.append_column(self._categoryColumn)
 150
 151                 self._categoryModel = gtk.ListStore(gobject.TYPE_STRING)
 152                 self._categoryView.set_model(self._categoryModel)
 153                 #colourize each row differently for easier reading
 154                 self._categoryView.set_property('rules_hint', 1)
 155
 156                 #Populate the catagories list
 157                 for key in unit_data.UNIT_CATEGORIES:
 158                         row = (key, )
 159                         self._categoryModel.append(row)
 160
 161                 #--------- connections to GUI ----------------
 162                 dic = {
 163                         "on_exit_menu_activate": self._on_user_exit,
 164                         "on_main_window_destroy": self._on_user_exit,
 165                         "on_categoryView_select_row": self._on_click_category,
 166                         "on_unitValue_changed": self._on_unit_value_changed,
 167                         "on_previousUnitValue_changed": self._on_previous_unit_value_changed,
 168                         "on_findButton_clicked": self._on_find_activate,
 169                         "on_findEntry_activated": self._on_find_activate,
 170                         "on_findEntry_changed": self._on_findEntry_changed,
 171                         "on_aboutMenuItem_activate": self._on_about_clicked,
 172                         "on_clearSelectionMenuItem_activate": self._on_user_clear_selections,
 173                         "on_unitsView_cursor_changed": self._on_click_unit,
 174                         "on_shortlistcheck_toggled": self._on_shortlist_changed,
 175                         "on_toggleShortList_activate": self._on_edit_shortlist,
 176                 }
 177                 widgets.signal_autoconnect(dic)
 178                 self._mainWindow.connect("key-press-event", self._on_key_press)
 179                 self._mainWindow.connect("window-state-event", self._on_window_state_change)
 180
 181                 replacementButtons = []
 182                 menu = hildonize.hildonize_menu(
 183                         self._mainWindow,
 184                         widgets.get_widget("mainMenuBar"),
 185                         replacementButtons
 186                 )
 187                 if not hildonize.IS_HILDON_SUPPORTED:
 188                         _moduleLogger.warning("No hildonization support")
 189
 190                 hildonize.set_application_title(
 191                         self._mainWindow, "%s - Unit Conversion Utility" % constants.__pretty_app_name__
 192                 )
 193                 iconPath = pixmapspath + '/gonvert.png'
 194                 if os.path.exists(iconPath):
 195                         self._mainWindow.set_icon(gtk.gdk.pixbuf_new_from_file(iconPath))
 196                 else:
 197                         _moduleLogger.warn("Error: Could not find gonvert icon: %s" % iconPath)
 198
 199                 self._load_settings()
 200
 201         def _load_settings(self):
 202                 #Restore window size from previously saved settings if it exists and is valid.
 203                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 204                 if os.path.exists(windowDatPath):
 205                         #Retrieving previous window settings from ~/.gonvert/window.dat
 206                         saved_window = pickle.load(open(windowDatPath, "r"))
 207                         #If the 'size' has been stored, then extract size from saved_window.
 208                         if 'size' in saved_window:
 209                                 a, b = saved_window['size']
 210                                 self._mainWindow.resize(a, b)
 211
 212                 #Restore selections from previously saved settings if it exists and is valid.
 213                 historical_catergory_found = False
 214                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 215                 if os.path.exists(selectionsDatPath):
 216                         #Retrieving previous selections from ~/.gonvert/selections.dat
 217                         selections = pickle.load(open(selectionsDatPath, 'r'))
 218                         #Restoring previous selections.
 219                         #If the 'selected_unts' has been stored, then extract self._defaultUnitForCategory from selections.
 220                         if 'selected_units' in selections:
 221                                 self._defaultUnitForCategory = selections['selected_units']
 222                         #Make sure that the 'self._selectedCategoryName' has been stored.
 223                         if 'selected_category' in selections:
 224                                 #Match an available category to the previously selected category.
 225                                 for counter in range(len(unit_data.UNIT_CATEGORIES)):
 226                                         if selections['selected_category'] == unit_data.UNIT_CATEGORIES[counter]:
 227                                                 # Restore the previously selected category.
 228                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
 229                                                 self._categoryView.grab_focus()
 230                                 historical_catergory_found = True
 231
 232                 if not historical_catergory_found:
 233                         print "Couldn't find saved category, using default."
 234                         #If historical records were not kept then default to
 235                         # put the focus on the first category
 236                         self._categoryView.set_cursor(0, self._categoryColumn, False)
 237                         self._categoryView.grab_focus()
 238
 239                 self._select_default_unit()
 240
 241         def _save_settings(self):
 242                 """
 243                 This routine saves the selections to a file, and
 244                 should therefore only be called when exiting the program.
 245
 246                 Update selections dictionary which consists of the following keys:
 247                 'self._selectedCategoryName': full name of selected category
 248                 'self._defaultUnitForCategory': self._defaultUnitForCategory dictionary which contains:
 249                 [categoryname: #1 displayed unit, #2 displayed unit]
 250                 """
 251                 #Determine the contents of the selected category row
 252                 selected, iter = self._categoryView.get_selection().get_selected()
 253                 self._selectedCategoryName = self._categoryModel.get_value(iter, 0)
 254
 255                 selections = {
 256                         'selected_category': self._selectedCategoryName,
 257                         'selected_units': self._defaultUnitForCategory
 258                 }
 259                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 260                 pickle.dump(selections, open(selectionsDatPath, 'w'))
 261
 262                 #Get last size of app and save it
 263                 window_settings = {
 264                         'size': self._mainWindow.get_size()
 265                 }
 266                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 267                 pickle.dump(window_settings, open(windowDatPath, 'w'))
 268
 269         def _clear_find(self):
 270                 # switch to "new find" state
 271                 self._find_result = []
 272                 self._findIndex = 0
 273
 274                 # Clear our user message
 275                 self._findLabel.set_text('')
 276
 277         def _find_first(self):
 278                 assert len(self._find_result) == 0
 279                 assert self._findIndex == 0
 280                 findString = self._findEntry.get_text().strip().lower()
 281                 if not findString:
 282                         return
 283
 284                 # Gather info on all the matching units from all categories
 285                 for catIndex, category in enumerate(unit_data.UNIT_CATEGORIES):
 286                         units = unit_data.get_units(category)
 287                         for unitIndex, unit in enumerate(units):
 288                                 loweredUnit = unit.lower()
 289                                 if loweredUnit in findString or findString in loweredUnit:
 290                                         self._find_result.append((category, unit, catIndex, unitIndex))
 291
 292         def _update_find_selection(self):
 293                 assert 0 < len(self._find_result)
 294
 295                 #check if next find is in a new category (prevent category changes when unnecessary
 296                 if self._selectedCategoryName != self._find_result[self._findIndex][0]:
 297                         self._categoryView.set_cursor(
 298                                 self._find_result[self._findIndex][2], self._categoryColumn, False
 299                         )
 300
 301                 self._unitsView.set_cursor(
 302                         self._find_result[self._findIndex][3], self._unitNameColumn, True
 303                 )
 304
 305         def _find_next(self):
 306                 if len(self._find_result) == 0:
 307                         self._find_first()
 308                 else:
 309                         if self._findIndex == len(self._find_result)-1:
 310                                 self._findIndex = 0
 311                         else:
 312                                 self._findIndex += 1
 313
 314                 if not self._find_result:
 315                         self._findLabel.set_text('Text not found')
 316                 else:
 317                         self._update_find_selection()
 318                         resultsLeft = len(self._find_result) - self._findIndex - 1
 319                         self._findLabel.set_text(
 320                                 '%s result(s) left' % (resultsLeft, )
 321                         )
 322
 323         def _find_previous(self):
 324                 if len(self._find_result) == 0:
 325                         self._find_first()
 326                 else:
 327                         if self._findIndex == 0:
 328                                 self._findIndex = len(self._find_result)-1
 329                         else:
 330                                 self._findIndex -= 1
 331
 332                 if not self._find_result:
 333                         self._findLabel.set_text('Text not found')
 334                 else:
 335                         self._update_find_selection()
 336                         resultsLeft = len(self._find_result) - self._findIndex - 1
 337                         self._findLabel.set_text(
 338                                 '%s result(s) left' % (resultsLeft, )
 339                         )
 340
 341         def _toggle_find(self):
 342                 if self._searchLayout.get_property("visible"):
 343                         self._searchLayout.hide()
 344                 else:
 345                         self._searchLayout.show()
 346
 347         def _unit_model_cmp(self, sortedModel, leftItr, rightItr):
 348                 leftUnitText = self._unitModel.get_value(leftItr, 0)
 349                 rightUnitText = self._unitModel.get_value(rightItr, 0)
 350                 return cmp(leftUnitText, rightUnitText)
 351
 352         def _symbol_model_cmp(self, sortedModel, leftItr, rightItr):
 353                 leftSymbolText = self._unitModel.get_value(leftItr, 2)
 354                 rightSymbolText = self._unitModel.get_value(rightItr, 2)
 355                 return cmp(leftSymbolText, rightSymbolText)
 356
 357         def _value_model_cmp(self, sortedModel, leftItr, rightItr):
 358                 #special sorting exceptions for ascii values (instead of float values)
 359                 if self._selectedCategoryName == "Computer Numbers":
 360                         leftValue = self._unitModel.get_value(leftItr, 1)
 361                         rightValue = self._unitModel.get_value(rightItr, 1)
 362                 else:
 363                         leftValueText = self._unitModel.get_value(leftItr, 1)
 364                         leftValue = float(leftValueText) if leftValueText else 0.0
 365
 366                         rightValueText = self._unitModel.get_value(rightItr, 1)
 367                         rightValue = float(rightValueText) if rightValueText else 0.0
 368                 return cmp(leftValue, rightValue)
 369
 370         def _get_column_sort_stuff(self):
 371                 columns = (
 372                         (self._unitNameColumn, "_unit_sort_direction", self._unit_model_cmp),
 373                         (self._unitValueColumn, "_value_sort_direction", self._value_model_cmp),
 374                         (self._unitSymbolColumn, "_units_sort_direction", self._symbol_model_cmp),
 375                 )
 376                 return columns
 377
 378         def _switch_category(self, category):
 379                 self._selectedCategoryName = category
 380                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[self._selectedCategoryName]
 381
 382                 #Fill up the units descriptions and clear the value cells
 383                 self._clear_visible_unit_data()
 384                 for key in unit_data.get_units(self._selectedCategoryName):
 385                         iter = self._unitModel.append()
 386                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
 387                 self._sortedUnitModel.sort_column_changed()
 388
 389                 self._select_default_unit()
 390
 391         def _clear_visible_unit_data(self):
 392                 self._unitDescription.get_buffer().set_text("")
 393                 self._unitName.set_text('')
 394                 self._unitValue.set_text('')
 395                 self._unitSymbol.set_text('')
 396
 397                 self._previousUnitName.set_text('')
 398                 self._previousUnitValue.set_text('')
 399                 self._previousUnitSymbol.set_text('')
 400
 401                 self._unitModel.clear()
 402
 403         def _select_default_unit(self):
 404                 # Restore the previous historical settings of previously selected units
 405                 # in this newly selected category
 406                 defaultPrimary = unit_data.get_base_unit(self._selectedCategoryName)
 407                 defaultSecondary = ""
 408                 if self._selectedCategoryName in self._defaultUnitForCategory:
 409                         if self._defaultUnitForCategory[self._selectedCategoryName][0]:
 410                                 defaultPrimary = self._defaultUnitForCategory[self._selectedCategoryName][0]
 411                         if self._defaultUnitForCategory[self._selectedCategoryName][1]:
 412                                 defaultSecondary = self._defaultUnitForCategory[self._selectedCategoryName][1]
 413
 414                 units = unit_data.get_units(self._selectedCategoryName)
 415
 416                 #Restore oldest selection first.
 417                 if defaultPrimary:
 418                         unitIndex = units.index(defaultPrimary)
 419                         self._unitsView.set_cursor(unitIndex, self._unitNameColumn, True)
 420
 421                 #Restore newest selection second.
 422                 if defaultSecondary:
 423                         unitIndex = units.index(defaultSecondary)
 424                         self._unitsView.set_cursor(unitIndex, self._unitNameColumn, True)
 425
 426                 # select the text so user can start typing right away
 427                 self._unitValue.grab_focus()
 428                 self._unitValue.select_region(0, -1)
 429
 430         def _sanitize_value(self, userEntry):
 431                 if self._selectedCategoryName == "Computer Numbers":
 432                         if userEntry == '':
 433                                 value = '0'
 434                         else:
 435                                 value = userEntry
 436                 else:
 437                         if userEntry == '':
 438                                 value = 0.0
 439                         else:
 440                                 value = float(userEntry)
 441                 return value
 442
 443         def _on_shortlist_changed(self, *args):
 444                 try:
 445                         raise NotImplementedError("%s" % self._shortlistcheck.get_active())
 446                 except Exception:
 447                         _moduleLogger.exception("")
 448
 449         def _on_edit_shortlist(self, *args):
 450                 try:
 451                         raise NotImplementedError("%s" % self._toggleShortList.get_active())
 452                 except Exception:
 453                         _moduleLogger.exception("")
 454
 455         def _on_user_clear_selections(self, *args):
 456                 try:
 457                         selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 458                         os.remove(selectionsDatPath)
 459                         self._defaultUnitForCategory = {}
 460                 except Exception:
 461                         _moduleLogger.exception("")
 462
 463         def _on_key_press(self, widget, event, *args):
 464                 """
 465                 @note Hildon specific
 466                 """
 467                 RETURN_TYPES = (gtk.keysyms.Return, gtk.keysyms.ISO_Enter, gtk.keysyms.KP_Enter)
 468                 try:
 469                         if (
 470                                 event.keyval == gtk.keysyms.F6 or
 471                                 event.keyval in RETURN_TYPES and event.get_state() & gtk.gdk.CONTROL_MASK
 472                         ):
 473                                 if self._isFullScreen:
 474                                         self._mainWindow.unfullscreen()
 475                                 else:
 476                                         self._mainWindow.fullscreen()
 477                         elif event.keyval == gtk.keysyms.f and event.get_state() & gtk.gdk.CONTROL_MASK:
 478                                 self._toggle_find()
 479                         elif event.keyval == gtk.keysyms.p and event.get_state() & gtk.gdk.CONTROL_MASK:
 480                                 self._find_previous()
 481                         elif event.keyval == gtk.keysyms.n and event.get_state() & gtk.gdk.CONTROL_MASK:
 482                                 self._find_next()
 483                 except Exception, e:
 484                         _moduleLogger.exception("")
 485
 486         def _on_window_state_change(self, widget, event, *args):
 487                 """
 488                 @note Hildon specific
 489                 """
 490                 try:
 491                         if event.new_window_state & gtk.gdk.WINDOW_STATE_FULLSCREEN:
 492                                 self._isFullScreen = True
 493                         else:
 494                                 self._isFullScreen = False
 495                 except Exception, e:
 496                         _moduleLogger.exception("")
 497
 498         def _on_findEntry_changed(self, *args):
 499                 """
 500                 Clear out find results since the user wants to look for something new
 501                 """
 502                 try:
 503                         self._clear_find()
 504                 except Exception:
 505                         _moduleLogger.exception("")
 506
 507         def _on_find_activate(self, *args):
 508                 try:
 509                         self._find_next()
 510                         self._findButton.grab_focus()
 511                 except Exception:
 512                         _moduleLogger.exception("")
 513
 514         def _on_click_unit_column(self, col):
 515                 """
 516                 Sort the contents of the col when the user clicks on the title.
 517                 """
 518                 try:
 519                         #Determine which column requires sorting
 520                         columns = self._get_column_sort_stuff()
 521                         for columnIndex, (maybeCol, directionName, col_cmp) in enumerate(columns):
 522                                 if col is maybeCol:
 523                                         direction = getattr(self, directionName)
 524                                         gtkDirection = gtk.SORT_ASCENDING if direction else gtk.SORT_DESCENDING
 525
 526                                         # cause a sort
 527                                         self._sortedUnitModel.set_sort_column_id(columnIndex, gtkDirection)
 528
 529                                         # set the visual for sorting
 530                                         col.set_sort_indicator(True)
 531                                         col.set_sort_order(not direction)
 532
 533                                         setattr(self, directionName, not direction)
 534                                         break
 535                                 else:
 536                                         maybeCol.set_sort_indicator(False)
 537                         else:
 538                                 assert False, "Unknown column: %s" % (col.get_title(), )
 539                 except Exception:
 540                         _moduleLogger.exception("")
 541
 542         def _on_click_category(self, *args):
 543                 try:
 544                         selected, iter = self._categoryView.get_selection().get_selected()
 545                         if iter is None:
 546                                 # User is typing in an invalid string, not selecting any category
 547                                 return
 548                         selectedCategory = self._categoryModel.get_value(iter, 0)
 549                         self._switch_category(selectedCategory)
 550                 except Exception:
 551                         _moduleLogger.exception("")
 552
 553         def _on_click_unit(self, *args):
 554                 try:
 555                         selected, iter = self._unitsView.get_selection().get_selected()
 556                         selected_unit = selected.get_value(iter, 0)
 557                         unit_spec = self._unitDataInCategory[selected_unit]
 558
 559                         if self._unitName.get_text() != selected_unit:
 560                                 self._previousUnitName.set_text(self._unitName.get_text())
 561                                 self._previousUnitValue.set_text(self._unitValue.get_text())
 562                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
 563
 564                         self._unitName.set_text(selected_unit)
 565                         self._unitValue.set_text(selected.get_value(iter, 1))
 566                         buffer = self._unitDescription.get_buffer()
 567                         buffer.set_text(unit_spec[2])
 568                         self._unitSymbol.set_text(unit_spec[1]) # put units into label text
 569                         if unit_spec[1]:
 570                                 self._unitSymbol.show()
 571                         else:
 572                                 self._unitSymbol.hide()
 573
 574                         if self._unitValue.get_text() == '':
 575                                 if self._selectedCategoryName == "Computer Numbers":
 576                                         self._unitValue.set_text("0")
 577                                 else:
 578                                         self._unitValue.set_text("0.0")
 579
 580                         self._defaultUnitForCategory[self._selectedCategoryName] = [
 581                                 self._unitName.get_text(), self._previousUnitName.get_text()
 582                         ]
 583
 584                         # select the text so user can start typing right away
 585                         self._unitValue.grab_focus()
 586                         self._unitValue.select_region(0, -1)
 587                 except Exception:
 588                         _moduleLogger.exception("")
 589
 590         def _on_unit_value_changed(self, *args):
 591                 try:
 592                         if self._unitName.get_text() == '':
 593                                 return
 594                         if not self._unitValue.is_focus():
 595                                 return
 596
 597                         #retrieve the conversion function and value from the selected unit
 598                         value = self._sanitize_value(self._unitValue.get_text())
 599                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 600                         base = func.to_base(value, arg)
 601
 602                         #point to the first row
 603                         for row in self._unitModel:
 604                                 func, arg = self._unitDataInCategory[row[0]][0]
 605                                 row[1] = str(func.from_base(base, arg))
 606
 607                         # Update the secondary unit entry
 608                         if self._previousUnitName.get_text() != '':
 609                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 610                                 self._previousUnitValue.set_text(str(func.from_base(base, arg, )))
 611                 except Exception:
 612                         _moduleLogger.exception("")
 613
 614         def _on_previous_unit_value_changed(self, *args):
 615                 try:
 616                         if self._previousUnitName.get_text() == '':
 617                                 return
 618                         if not self._previousUnitValue.is_focus():
 619                                 return
 620
 621                         #retrieve the conversion function and value from the selected unit
 622                         value = self._sanitize_value(self._previousUnitValue.get_text())
 623                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 624                         base = func.to_base(value, arg)
 625
 626                         #point to the first row
 627                         for row in self._unitModel:
 628                                 func, arg = self._unitDataInCategory[row[0]][0]
 629                                 row[1] = str(func.from_base(base, arg))
 630
 631                         # Update the primary unit entry
 632                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 633                         self._unitValue.set_text(str(func.from_base(base, arg, )))
 634                 except Exception:
 635                         _moduleLogger.exception("")
 636
 637         def _on_about_clicked(self, a):
 638                 dlg = gtk.AboutDialog()
 639                 dlg.set_name(constants.__pretty_app_name__)
 640                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
 641                 dlg.set_copyright("Copyright 2009 - GPL")
 642                 dlg.set_comments("")
 643                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
 644                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
 645                 dlg.run()
 646                 dlg.destroy()
 647
 648         def _on_user_exit(self, *args):
 649                 try:
 650                         self._save_settings()
 651                 except Exception:
 652                         _moduleLogger.exception("")
 653                 finally:
 654                         gtk.main_quit()
 655
 656
 657 def main():
 658         logging.basicConfig(level = logging.DEBUG)
 659         try:
 660                 os.makedirs(constants._data_path_)
 661         except OSError, e:
 662                 if e.errno != 17:
 663                         raise
 664
 665         gonvert = Gonvert()
 666         if not PROFILE_STARTUP:
 667                 gtk.main()
 668
 669
 670 if __name__ == "__main__":
 671         main()