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
  21 gettext.bindtextdomain('gonvert', '/usr/share/locale')
  22 gettext.textdomain('gonvert')
  23 _ = gettext.gettext
  24
  25
  26 def change_menu_label(widgets, labelname, newtext):
  27         item_label = widgets.get_widget(labelname).get_children()[0]
  28         item_label.set_text(newtext)
  29
  30
  31 class Gonvert(object):
  32
  33         _glade_files = [
  34                 os.path.join(os.path.dirname(__file__), "gonvert.glade"),
  35                 os.path.join(os.path.dirname(__file__), "../data/gonvert.glade"),
  36                 os.path.join(os.path.dirname(__file__), "../lib/gonvert.glade"),
  37                 '/usr/lib/gonvert/gonvert.glade',
  38         ]
  39
  40         def __init__(self):
  41                 self._unitDataInCategory = None
  42                 self._unit_sort_direction = False
  43                 self._value_sort_direction = False
  44                 self._units_sort_direction = False
  45                 self._isFullScreen = False
  46
  47                 self._find_result = [] # empty find result list
  48                 self._findIndex = 0 # default to find result number zero
  49
  50                 self._selectedCategoryName = '' # preset to no selected category
  51                 self._defaultUnitForCategory = {} # empty dictionary for later use
  52
  53                 #check to see if glade file is in current directory (user must be
  54                 # running from download untar directory)
  55                 for gladePath in self._glade_files:
  56                         if os.path.isfile(gladePath):
  57                                 homepath = os.path.dirname(gladePath)
  58                                 pixmapspath = "/".join((homepath, "pixmaps"))
  59                                 widgets = gtk.glade.XML(gladePath)
  60                                 break
  61                 else:
  62                         _moduleLogger.error("UI Descriptor not found!")
  63                         gtk.main_quit()
  64                         return
  65
  66                 self._mainWindow = widgets.get_widget('mainWindow')
  67
  68                 change_menu_label(widgets, 'fileMenuItem', _('File'))
  69                 change_menu_label(widgets, 'exitMenuItem', _('Exit'))
  70                 change_menu_label(widgets, 'toolsMenuItem', _('Tools'))
  71                 change_menu_label(widgets, 'clearSelectionMenuItem', _('Clear selections'))
  72                 change_menu_label(widgets, 'helpMenuItem', _('Help'))
  73                 change_menu_label(widgets, 'aboutMenuItem', _('About'))
  74                 change_menu_label(widgets, 'findButton', _('Find'))
  75
  76                 self._shortlistcheck = widgets.get_widget('shortlistcheck')
  77                 self._toggleShortList = widgets.get_widget('toggleShortList')
  78
  79                 self._categoryView = widgets.get_widget('categoryView')
  80
  81                 self._unitsView = widgets.get_widget('unitsView')
  82                 self._unitsView.set_property('rules_hint', 1)
  83                 self._unitsView_selection = self._unitsView.get_selection()
  84
  85                 self._unitName = widgets.get_widget('unitName')
  86                 self._unitValue = widgets.get_widget('unitValue')
  87                 self._previousUnitName = widgets.get_widget('previousUnitName')
  88                 self._previousUnitValue = widgets.get_widget('previousUnitValue')
  89
  90                 self._unitSymbol = widgets.get_widget('unitSymbol')
  91                 self._previousUnitSymbol = widgets.get_widget('previousUnitSymbol')
  92
  93                 self._unitDescription = widgets.get_widget('unitDescription')
  94
  95                 self._searchLayout = widgets.get_widget('searchLayout')
  96                 self._searchLayout.hide()
  97                 self._findEntry = widgets.get_widget('findEntry')
  98                 self._findLabel = widgets.get_widget('findLabel')
  99                 self._findButton = widgets.get_widget('findButton')
 100                 ToolTips = gtk.Tooltips()
 101                 ToolTips.set_tip(self._findButton, _(u'Find unit (F6)'))
 102
 103                 #insert a self._categoryColumnumn into the units list even though the heading will not be seen
 104                 renderer = gtk.CellRendererText()
 105                 self._unitNameColumn = gtk.TreeViewColumn(_('Unit Name'), renderer)
 106                 self._unitNameColumn.set_property('resizable', 1)
 107                 self._unitNameColumn.add_attribute(renderer, 'text', 0)
 108                 self._unitNameColumn.set_clickable(True)
 109                 self._unitNameColumn.connect("clicked", self._on_click_unit_column)
 110                 self._unitsView.append_column(self._unitNameColumn)
 111
 112                 self._unitValueColumn = gtk.TreeViewColumn(_('Value'), renderer)
 113                 self._unitValueColumn.set_property('resizable', 1)
 114                 self._unitValueColumn.add_attribute(renderer, 'text', 1)
 115                 self._unitValueColumn.set_clickable(True)
 116                 self._unitValueColumn.connect("clicked", self._on_click_unit_column)
 117                 self._unitsView.append_column(self._unitValueColumn)
 118
 119                 self._unitSymbolColumn = gtk.TreeViewColumn(_('Units'), renderer)
 120                 self._unitSymbolColumn.set_property('resizable', 1)
 121                 self._unitSymbolColumn.add_attribute(renderer, 'text', 2)
 122                 self._unitSymbolColumn.set_clickable(True)
 123                 self._unitSymbolColumn.connect("clicked", self._on_click_unit_column)
 124                 self._unitsView.append_column(self._unitSymbolColumn)
 125
 126                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 127                 self._sortedUnitModel = gtk.TreeModelSort(self._unitModel)
 128                 columns = self._get_column_sort_stuff()
 129                 for columnIndex, (column, sortDirection, col_cmp) in enumerate(columns):
 130                         self._sortedUnitModel.set_sort_func(columnIndex, col_cmp)
 131                 self._unitsView.set_model(self._sortedUnitModel)
 132
 133                 #Insert a column into the category list even though the heading will not be seen
 134                 renderer = gtk.CellRendererText()
 135                 self._categoryColumn = gtk.TreeViewColumn('Title', renderer)
 136                 self._categoryColumn.set_property('resizable', 1)
 137                 self._categoryColumn.add_attribute(renderer, 'text', 0)
 138                 self._categoryView.append_column(self._categoryColumn)
 139
 140                 self._categoryModel = gtk.ListStore(gobject.TYPE_STRING)
 141                 self._categoryView.set_model(self._categoryModel)
 142                 #colourize each row differently for easier reading
 143                 self._categoryView.set_property('rules_hint', 1)
 144
 145                 #Populate the catagories list
 146                 for key in unit_data.UNIT_CATEGORIES:
 147                         iter = self._categoryModel.append()
 148                         self._categoryModel.set(iter, 0, key)
 149
 150                 #--------- connections to GUI ----------------
 151                 dic = {
 152                         "on_exit_menu_activate": self._on_user_exit,
 153                         "on_main_window_destroy": self._on_user_exit,
 154                         "on_categoryView_select_row": self._on_click_category,
 155                         "on_unitValue_changed": self._on_unit_value_changed,
 156                         "on_previousUnitValue_changed": self._on_previous_unit_value_changed,
 157                         "on_findButton_clicked": self._on_find_activate,
 158                         "on_findEntry_activated": self._on_find_activate,
 159                         "on_findEntry_changed": self._on_findEntry_changed,
 160                         "on_aboutMenuItem_activate": self._on_about_clicked,
 161                         "on_clearSelectionMenuItem_activate": self._on_user_clear_selections,
 162                         "on_unitsView_cursor_changed": self._on_click_unit,
 163                         "on_shortlistcheck_toggled": self._on_shortlist_changed,
 164                         "on_toggleShortList_activate": self._on_edit_shortlist,
 165                 }
 166                 widgets.signal_autoconnect(dic)
 167                 self._mainWindow.connect("key-press-event", self._on_key_press)
 168                 self._mainWindow.connect("window-state-event", self._on_window_state_change)
 169
 170                 self._mainWindow.set_title('gonvert- %s - Unit Conversion Utility' % constants.__version__)
 171                 iconPath = pixmapspath + '/gonvert.png'
 172                 if os.path.exists(iconPath):
 173                         self._mainWindow.set_icon(gtk.gdk.pixbuf_new_from_file(iconPath))
 174                 else:
 175                         _moduleLogger.warn("Error: Could not find gonvert icon: %s" % iconPath)
 176
 177                 self._load_settings()
 178
 179         def _load_settings(self):
 180                 #Restore window size from previously saved settings if it exists and is valid.
 181                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 182                 if os.path.exists(windowDatPath):
 183                         #Retrieving previous window settings from ~/.gonvert/window.dat
 184                         saved_window = pickle.load(open(windowDatPath, "r"))
 185                         #If the 'size' has been stored, then extract size from saved_window.
 186                         if 'size' in saved_window:
 187                                 a, b = saved_window['size']
 188                                 self._mainWindow.resize(a, b)
 189                         else:
 190                                 #Maximize if no previous size was found
 191                                 #self._mainWindow.maximize()
 192                                 pass
 193                 else:
 194                         #Maximize if no previous window.dat file was found
 195                         #self._mainWindow.maximize()
 196                         pass
 197
 198                 #Restore selections from previously saved settings if it exists and is valid.
 199                 historical_catergory_found = False
 200                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 201                 if os.path.exists(selectionsDatPath):
 202                         #Retrieving previous selections from ~/.gonvert/selections.dat
 203                         selections = pickle.load(open(selectionsDatPath, 'r'))
 204                         #Restoring previous selections.
 205                         #If the 'selected_unts' has been stored, then extract self._defaultUnitForCategory from selections.
 206                         if 'selected_units' in selections:
 207                                 self._defaultUnitForCategory = selections['selected_units']
 208                         #Make sure that the 'self._selectedCategoryName' has been stored.
 209                         if 'selected_category' in selections:
 210                                 #Match an available category to the previously selected category.
 211                                 for counter in range(len(unit_data.UNIT_CATEGORIES)):
 212                                         if selections['selected_category'] == unit_data.UNIT_CATEGORIES[counter]:
 213                                                 # Restore the previously selected category.
 214                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
 215                                                 self._categoryView.grab_focus()
 216                                 historical_catergory_found = True
 217
 218                 if not historical_catergory_found:
 219                         print "Couldn't find saved category, using default."
 220                         #If historical records were not kept then default to
 221                         # put the focus on the first category
 222                         self._categoryView.set_cursor(0, self._categoryColumn, False)
 223                         self._categoryView.grab_focus()
 224
 225                 self._select_default_unit()
 226
 227         def _save_settings(self):
 228                 """
 229                 This routine saves the selections to a file, and
 230                 should therefore only be called when exiting the program.
 231
 232                 Update selections dictionary which consists of the following keys:
 233                 'self._selectedCategoryName': full name of selected category
 234                 'self._defaultUnitForCategory': self._defaultUnitForCategory dictionary which contains:
 235                 [categoryname: #1 displayed unit, #2 displayed unit]
 236                 """
 237                 #Determine the contents of the selected category row
 238                 selected, iter = self._categoryView.get_selection().get_selected()
 239                 self._selectedCategoryName = self._categoryModel.get_value(iter, 0)
 240
 241                 selections = {
 242                         'selected_category': self._selectedCategoryName,
 243                         'selected_units': self._defaultUnitForCategory
 244                 }
 245                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 246                 pickle.dump(selections, open(selectionsDatPath, 'w'))
 247
 248                 #Get last size of app and save it
 249                 window_settings = {
 250                         'size': self._mainWindow.get_size()
 251                 }
 252                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 253                 pickle.dump(window_settings, open(windowDatPath, 'w'))
 254
 255         def _clear_find(self):
 256                 # switch to "new find" state
 257                 self._find_result = []
 258                 self._findIndex = 0
 259
 260                 # Clear our user message
 261                 self._findLabel.set_text('')
 262
 263         def _find_first(self):
 264                 assert len(self._find_result) == 0
 265                 assert self._findIndex == 0
 266                 findString = string.lower(string.strip(self._findEntry.get_text()))
 267                 if not findString:
 268                         return
 269
 270                 # Gather info on all the matching units from all categories
 271                 for catIndex, category in enumerate(unit_data.UNIT_CATEGORIES):
 272                         units = unit_data.get_units(category)
 273                         for unitIndex, unit in enumerate(units):
 274                                 loweredUnit = unit.lower()
 275                                 if loweredUnit in findString or findString in loweredUnit:
 276                                         self._find_result.append((category, unit, catIndex, unitIndex))
 277
 278         def _update_find_selection(self):
 279                 assert 0 < len(self._find_result)
 280
 281                 #check if next find is in a new category (prevent category changes when unnecessary
 282                 if self._selectedCategoryName != self._find_result[self._findIndex][0]:
 283                         self._categoryView.set_cursor(
 284                                 self._find_result[self._findIndex][2], self._categoryColumn, False
 285                         )
 286
 287                 self._unitsView.set_cursor(
 288                         self._find_result[self._findIndex][3], self._unitNameColumn, True
 289                 )
 290
 291         def _find_next(self):
 292                 """
 293                 check if 'new find' or 'last find' or 'next-find'
 294
 295                 new-find = run the find algorithm which also selects the first found unit
 296                          = self._findIndex = 0 and self._find_result = []
 297
 298                 last-find = restart from top again
 299                           = self._findIndex = len(self._find_result)
 300
 301                 next-find = continue to next found location
 302                            = self._findIndex = 0 and len(self._find_result)>0
 303                 """
 304                 if len(self._find_result) == 0:
 305                         self._find_first()
 306                 else:
 307                         if self._findIndex == len(self._find_result)-1:
 308                                 self._findIndex = 0
 309                         else:
 310                                 self._findIndex += 1
 311
 312                 if not self._find_result:
 313                         self._findLabel.set_text('Text not found')
 314                 else:
 315                         self._update_find_selection()
 316                         resultsLeft = len(self._find_result) - self._findIndex - 1
 317                         self._findLabel.set_text(
 318                                 '%s result(s) left' % (resultsLeft, )
 319                         )
 320
 321         def _find_previous(self):
 322                 """
 323                 check if 'new find' or 'last find' or 'next-find'
 324
 325                 new-find = run the find algorithm which also selects the first found unit
 326                          = self._findIndex = 0 and self._find_result = []
 327
 328                 last-find = restart from top again
 329                           = self._findIndex = len(self._find_result)
 330
 331                 next-find = continue to next found location
 332                            = self._findIndex = 0 and len(self._find_result)>0
 333                 """
 334                 if len(self._find_result) == 0:
 335                         self._find_first()
 336                 else:
 337                         if self._findIndex == 0:
 338                                 self._findIndex = len(self._find_result)-1
 339                         else:
 340                                 self._findIndex -= 1
 341
 342                 if not self._find_result:
 343                         self._findLabel.set_text('Text not found')
 344                 else:
 345                         self._update_find_selection()
 346                         resultsLeft = len(self._find_result) - self._findIndex - 1
 347                         self._findLabel.set_text(
 348                                 '%s result(s) left' % (resultsLeft, )
 349                         )
 350
 351         def _toggle_find(self):
 352                 if self._searchLayout.get_property("visible"):
 353                         self._searchLayout.hide()
 354                 else:
 355                         self._searchLayout.show()
 356
 357         def _unit_model_cmp(self, sortedModel, leftItr, rightItr):
 358                 leftUnitText = self._unitModel.get_value(leftItr, 0)
 359                 rightUnitText = self._unitModel.get_value(rightItr, 0)
 360                 return cmp(leftUnitText, rightUnitText)
 361
 362         def _symbol_model_cmp(self, sortedModel, leftItr, rightItr):
 363                 leftSymbolText = self._unitModel.get_value(leftItr, 2)
 364                 rightSymbolText = self._unitModel.get_value(rightItr, 2)
 365                 return cmp(leftSymbolText, rightSymbolText)
 366
 367         def _value_model_cmp(self, sortedModel, leftItr, rightItr):
 368                 #special sorting exceptions for ascii values (instead of float values)
 369                 if self._selectedCategoryName == "Computer Numbers":
 370                         leftValue = self._unitModel.get_value(leftItr, 1)
 371                         rightValue = self._unitModel.get_value(rightItr, 1)
 372                 else:
 373                         leftValueText = self._unitModel.get_value(leftItr, 1)
 374                         leftValue = float(leftValueText) if leftValueText else 0.0
 375
 376                         rightValueText = self._unitModel.get_value(rightItr, 1)
 377                         rightValue = float(rightValueText) if rightValueText else 0.0
 378                 return cmp(leftValue, rightValue)
 379
 380         def _get_column_sort_stuff(self):
 381                 columns = (
 382                         (self._unitNameColumn, "_unit_sort_direction", self._unit_model_cmp),
 383                         (self._unitValueColumn, "_value_sort_direction", self._value_model_cmp),
 384                         (self._unitSymbolColumn, "_units_sort_direction", self._symbol_model_cmp),
 385                 )
 386                 return columns
 387
 388         def _switch_category(self, category):
 389                 self._selectedCategoryName = category
 390                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[self._selectedCategoryName]
 391
 392                 #Fill up the units descriptions and clear the value cells
 393                 self._clear_visible_unit_data()
 394                 for key in unit_data.get_units(self._selectedCategoryName):
 395                         iter = self._unitModel.append()
 396                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
 397                 self._sortedUnitModel.sort_column_changed()
 398
 399                 self._select_default_unit()
 400
 401         def _clear_visible_unit_data(self):
 402                 self._unitDescription.get_buffer().set_text("")
 403                 self._unitName.set_text('')
 404                 self._unitValue.set_text('')
 405                 self._unitSymbol.set_text('')
 406
 407                 self._previousUnitName.set_text('')
 408                 self._previousUnitValue.set_text('')
 409                 self._previousUnitSymbol.set_text('')
 410
 411                 self._unitModel.clear()
 412
 413         def _select_default_unit(self):
 414                 # Restore the previous historical settings of previously selected units
 415                 # in this newly selected category
 416                 defaultPrimary = unit_data.get_base_unit(self._selectedCategoryName)
 417                 defaultSecondary = ""
 418                 if self._selectedCategoryName in self._defaultUnitForCategory:
 419                         if self._defaultUnitForCategory[self._selectedCategoryName][0]:
 420                                 defaultPrimary = self._defaultUnitForCategory[self._selectedCategoryName][0]
 421                         if self._defaultUnitForCategory[self._selectedCategoryName][1]:
 422                                 defaultSecondary = self._defaultUnitForCategory[self._selectedCategoryName][1]
 423
 424                 units = unit_data.get_units(self._selectedCategoryName)
 425
 426                 #Restore oldest selection first.
 427                 if defaultPrimary:
 428                         unitIndex = units.index(defaultPrimary)
 429                         self._unitsView.set_cursor(unitIndex, self._unitNameColumn, True)
 430
 431                 #Restore newest selection second.
 432                 if defaultSecondary:
 433                         unitIndex = units.index(defaultSecondary)
 434                         self._unitsView.set_cursor(unitIndex, self._unitNameColumn, True)
 435
 436                 # select the text so user can start typing right away
 437                 self._unitValue.grab_focus()
 438                 self._unitValue.select_region(0, -1)
 439
 440         def _sanitize_value(self, userEntry):
 441                 if self._selectedCategoryName == "Computer Numbers":
 442                         if userEntry == '':
 443                                 value = '0'
 444                         else:
 445                                 value = userEntry
 446                 else:
 447                         if userEntry == '':
 448                                 value = 0.0
 449                         else:
 450                                 value = float(userEntry)
 451                 return value
 452
 453         def _on_shortlist_changed(self, *args):
 454                 try:
 455                         raise NotImplementedError("%s" % self._shortlistcheck.get_active())
 456                 except Exception:
 457                         _moduleLogger.exception("")
 458
 459         def _on_edit_shortlist(self, *args):
 460                 try:
 461                         raise NotImplementedError("%s" % self._toggleShortList.get_active())
 462                 except Exception:
 463                         _moduleLogger.exception("")
 464
 465         def _on_user_clear_selections(self, *args):
 466                 try:
 467                         selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 468                         os.remove(selectionsDatPath)
 469                         self._defaultUnitForCategory = {}
 470                 except Exception:
 471                         _moduleLogger.exception("")
 472
 473         def _on_key_press(self, widget, event, *args):
 474                 """
 475                 @note Hildon specific
 476                 """
 477                 RETURN_TYPES = (gtk.keysyms.Return, gtk.keysyms.ISO_Enter, gtk.keysyms.KP_Enter)
 478                 try:
 479                         if (
 480                                 event.keyval == gtk.keysyms.F6 or
 481                                 event.keyval in RETURN_TYPES and event.get_state() & gtk.gdk.CONTROL_MASK
 482                         ):
 483                                 if self._isFullScreen:
 484                                         self._mainWindow.unfullscreen()
 485                                 else:
 486                                         self._mainWindow.fullscreen()
 487                         elif event.keyval == gtk.keysyms.f and event.get_state() & gtk.gdk.CONTROL_MASK:
 488                                 self._toggle_find()
 489                         elif event.keyval == gtk.keysyms.p and event.get_state() & gtk.gdk.CONTROL_MASK:
 490                                 self._find_previous()
 491                         elif event.keyval == gtk.keysyms.n and event.get_state() & gtk.gdk.CONTROL_MASK:
 492                                 self._find_next()
 493                 except Exception, e:
 494                         _moduleLogger.exception("")
 495
 496         def _on_window_state_change(self, widget, event, *args):
 497                 """
 498                 @note Hildon specific
 499                 """
 500                 try:
 501                         if event.new_window_state & gtk.gdk.WINDOW_STATE_FULLSCREEN:
 502                                 self._isFullScreen = True
 503                         else:
 504                                 self._isFullScreen = False
 505                 except Exception, e:
 506                         _moduleLogger.exception("")
 507
 508         def _on_findEntry_changed(self, *args):
 509                 """
 510                 Clear out find results since the user wants to look for something new
 511                 """
 512                 try:
 513                         self._clear_find()
 514                 except Exception:
 515                         _moduleLogger.exception("")
 516
 517         def _on_find_activate(self, *args):
 518                 try:
 519                         self._find_next()
 520                         self._findButton.grab_focus()
 521                 except Exception:
 522                         _moduleLogger.exception("")
 523
 524         def _on_click_unit_column(self, col):
 525                 """
 526                 Sort the contents of the col when the user clicks on the title.
 527                 """
 528                 try:
 529                         #Determine which column requires sorting
 530                         columns = self._get_column_sort_stuff()
 531                         for columnIndex, (maybeCol, directionName, col_cmp) in enumerate(columns):
 532                                 if col is maybeCol:
 533                                         direction = getattr(self, directionName)
 534                                         gtkDirection = gtk.SORT_ASCENDING if direction else gtk.SORT_DESCENDING
 535
 536                                         # cause a sort
 537                                         self._sortedUnitModel.set_sort_column_id(columnIndex, gtkDirection)
 538
 539                                         # set the visual for sorting
 540                                         col.set_sort_indicator(True)
 541                                         col.set_sort_order(not direction)
 542
 543                                         setattr(self, directionName, not direction)
 544                                         break
 545                                 else:
 546                                         maybeCol.set_sort_indicator(False)
 547                         else:
 548                                 assert False, "Unknown column: %s" % (col.get_title(), )
 549                 except Exception:
 550                         _moduleLogger.exception("")
 551
 552         def _on_click_category(self, *args):
 553                 try:
 554                         selected, iter = self._categoryView.get_selection().get_selected()
 555                         if iter is None:
 556                                 # User is typing in an invalid string, not selecting any category
 557                                 return
 558                         selectedCategory = self._categoryModel.get_value(iter, 0)
 559                         self._switch_category(selectedCategory)
 560                 except Exception:
 561                         _moduleLogger.exception("")
 562
 563         def _on_click_unit(self, *args):
 564                 try:
 565                         selected, iter = self._unitsView.get_selection().get_selected()
 566                         selected_unit = selected.get_value(iter, 0)
 567                         unit_spec = self._unitDataInCategory[selected_unit]
 568
 569                         if self._unitName.get_text() != selected_unit:
 570                                 self._previousUnitName.set_text(self._unitName.get_text())
 571                                 self._previousUnitValue.set_text(self._unitValue.get_text())
 572                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
 573
 574                         self._unitName.set_text(selected_unit)
 575                         self._unitValue.set_text(selected.get_value(iter, 1))
 576                         buffer = self._unitDescription.get_buffer()
 577                         buffer.set_text(unit_spec[2])
 578                         self._unitSymbol.set_text(unit_spec[1]) # put units into label text
 579
 580                         if self._unitValue.get_text() == '':
 581                                 if self._selectedCategoryName == "Computer Numbers":
 582                                         self._unitValue.set_text("0")
 583                                 else:
 584                                         self._unitValue.set_text("0.0")
 585
 586                         self._defaultUnitForCategory[self._selectedCategoryName] = [
 587                                 self._unitName.get_text(), self._previousUnitName.get_text()
 588                         ]
 589
 590                         # select the text so user can start typing right away
 591                         self._unitValue.grab_focus()
 592                         self._unitValue.select_region(0, -1)
 593                 except Exception:
 594                         _moduleLogger.exception("")
 595
 596         def _on_unit_value_changed(self, *args):
 597                 try:
 598                         if self._unitName.get_text() == '':
 599                                 return
 600                         if not self._unitValue.is_focus():
 601                                 return
 602
 603                         #retrieve the conversion function and value from the selected unit
 604                         value = self._sanitize_value(self._unitValue.get_text())
 605                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 606                         base = func.to_base(value, arg)
 607
 608                         #point to the first row
 609                         for row in self._unitModel:
 610                                 func, arg = self._unitDataInCategory[row[0]][0]
 611                                 row[1] = str(func.from_base(base, arg))
 612
 613                         # Update the secondary unit entry
 614                         if self._previousUnitName.get_text() != '':
 615                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 616                                 self._previousUnitValue.set_text(str(func.from_base(base, arg, )))
 617                 except Exception:
 618                         _moduleLogger.exception("")
 619
 620         def _on_previous_unit_value_changed(self, *args):
 621                 try:
 622                         if self._previousUnitName.get_text() == '':
 623                                 return
 624                         if not self._previousUnitValue.is_focus():
 625                                 return
 626
 627                         #retrieve the conversion function and value from the selected unit
 628                         value = self._sanitize_value(self._previousUnitValue.get_text())
 629                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 630                         base = func.to_base(value, arg)
 631
 632                         #point to the first row
 633                         for row in self._unitModel:
 634                                 func, arg = self._unitDataInCategory[row[0]][0]
 635                                 row[1] = str(func.from_base(base, arg))
 636
 637                         # Update the primary unit entry
 638                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 639                         self._unitValue.set_text(str(func.from_base(base, arg, )))
 640                 except Exception:
 641                         _moduleLogger.exception("")
 642
 643         def _on_about_clicked(self, a):
 644                 dlg = gtk.AboutDialog()
 645                 dlg.set_name(constants.__pretty_app_name__)
 646                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
 647                 dlg.set_copyright("Copyright 2009 - GPL")
 648                 dlg.set_comments("")
 649                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
 650                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
 651                 dlg.run()
 652                 dlg.destroy()
 653
 654         def _on_user_exit(self, *args):
 655                 try:
 656                         self._save_settings()
 657                 except Exception:
 658                         _moduleLogger.exception("")
 659                 finally:
 660                         gtk.main_quit()
 661
 662
 663 def main():
 664         logging.basicConfig(level = logging.DEBUG)
 665         try:
 666                 os.makedirs(constants._data_path_)
 667         except OSError, e:
 668                 if e.errno != 17:
 669                         raise
 670
 671         gonvert = Gonvert()
 672         gtk.main()
 673
 674
 675 if __name__ == "__main__":
 676         main()