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._calcsuppress = False
  43                 self._unit_sort_direction = False
  44                 self._value_sort_direction = False
  45                 self._units_sort_direction = False
  46                 self._isFullScreen = False
  47
  48                 self._find_result = [] # empty find result list
  49                 self._findIndex = 0 # default to find result number zero
  50
  51                 self._selected_category = '' # preset to no selected category
  52                 self._selected_units = {} # empty dictionary for later use
  53
  54                 #check to see if glade file is in current directory (user must be
  55                 # running from download untar directory)
  56                 for gladePath in self._glade_files:
  57                         if os.path.isfile(gladePath):
  58                                 homepath = os.path.dirname(gladePath)
  59                                 pixmapspath = "/".join((homepath, "pixmaps"))
  60                                 widgets = gtk.glade.XML(gladePath)
  61                                 break
  62                 else:
  63                         return
  64
  65                 self._mainWindow = widgets.get_widget('mainWindow')
  66
  67                 change_menu_label(widgets, 'fileMenuItem', _('File'))
  68                 change_menu_label(widgets, 'exitMenuItem', _('Exit'))
  69                 change_menu_label(widgets, 'toolsMenuItem', _('Tools'))
  70                 change_menu_label(widgets, 'clearSelectionMenuItem', _('Clear selections'))
  71                 change_menu_label(widgets, 'writeUnitsMenuItem', _('Write Units'))
  72                 change_menu_label(widgets, 'helpMenuItem', _('Help'))
  73                 change_menu_label(widgets, 'aboutMenuItem', _('About'))
  74                 change_menu_label(widgets, 'findButton', _('Find'))
  75
  76                 self._shortlistcheck = widgets.get_widget('shortlistcheck')
  77                 self._toggleShortList = widgets.get_widget('toggleShortList')
  78
  79                 self._categoryView = widgets.get_widget('categoryView')
  80
  81                 self._unitsView = widgets.get_widget('unitsView')
  82                 self._unitsView.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                 messagebox = widgets.get_widget('msgbox')
  90                 messageboxtext = widgets.get_widget('msgboxtext')
  91
  92                 self._unitSymbol = widgets.get_widget('unitSymbol')
  93                 self._previousUnitSymbol = widgets.get_widget('previousUnitSymbol')
  94
  95                 self._unitDescription = widgets.get_widget('unitDescription')
  96
  97                 self._searchLayout = widgets.get_widget('searchLayout')
  98                 self._searchLayout.hide()
  99                 self._findEntry = widgets.get_widget('findEntry')
 100                 self._findLabel = widgets.get_widget('findLabel')
 101                 findButton = widgets.get_widget('findButton')
 102                 ToolTips = gtk.Tooltips()
 103                 ToolTips.set_tip(findButton, _(u'Find unit (F6)'))
 104
 105                 #insert a self._categoryColumnumn into the units list even though the heading will not be seen
 106                 renderer = gtk.CellRendererText()
 107                 self._unitNameColumn = gtk.TreeViewColumn(_('Unit Name'), renderer)
 108                 self._unitNameColumn.set_property('resizable', 1)
 109                 self._unitNameColumn.add_attribute(renderer, 'text', 0)
 110                 self._unitNameColumn.set_clickable(True)
 111                 self._unitNameColumn.connect("clicked", self._on_click_unit_column)
 112                 self._unitsView.append_column(self._unitNameColumn)
 113
 114                 self._unitValueColumn = gtk.TreeViewColumn(_('Value'), renderer)
 115                 self._unitValueColumn.set_property('resizable', 1)
 116                 self._unitValueColumn.add_attribute(renderer, 'text', 1)
 117                 self._unitValueColumn.set_clickable(True)
 118                 self._unitValueColumn.connect("clicked", self._on_click_unit_column)
 119                 self._unitsView.append_column(self._unitValueColumn)
 120
 121                 self._unitSymbolColumn = gtk.TreeViewColumn(_('Units'), renderer)
 122                 self._unitSymbolColumn.set_property('resizable', 1)
 123                 self._unitSymbolColumn.add_attribute(renderer, 'text', 2)
 124                 self._unitSymbolColumn.set_clickable(True)
 125                 self._unitSymbolColumn.connect("clicked", self._on_click_unit_column)
 126                 self._unitsView.append_column(self._unitSymbolColumn)
 127
 128                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 129                 self._sortedUnitModel = gtk.TreeModelSort(self._unitModel)
 130                 columns = self._get_column_sort_stuff()
 131                 for columnIndex, (column, sortDirection, col_cmp) in enumerate(columns):
 132                         self._sortedUnitModel.set_sort_func(columnIndex, col_cmp)
 133                 self._unitsView.set_model(self._sortedUnitModel)
 134
 135                 #Insert a column into the category list even though the heading will not be seen
 136                 renderer = gtk.CellRendererText()
 137                 self._categoryColumn = gtk.TreeViewColumn('Title', renderer)
 138                 self._categoryColumn.set_property('resizable', 1)
 139                 self._categoryColumn.add_attribute(renderer, 'text', 0)
 140                 self._categoryView.append_column(self._categoryColumn)
 141
 142                 self._categoryModel = gtk.ListStore(gobject.TYPE_STRING)
 143                 self._categoryView.set_model(self._categoryModel)
 144                 #colourize each row differently for easier reading
 145                 self._categoryView.set_property('rules_hint', 1)
 146
 147                 #Populate the catagories list
 148                 for key in unit_data.UNIT_CATEGORIES:
 149                         iter = self._categoryModel.append()
 150                         self._categoryModel.set(iter, 0, key)
 151
 152                 #--------- connections to GUI ----------------
 153                 dic = {
 154                         "on_exit_menu_activate": self._on_user_exit,
 155                         "on_main_window_destroy": self._on_user_exit,
 156                         "on_categoryView_select_row": self._on_click_category,
 157                         "on_unitValue_changed": self._on_unit_value_changed,
 158                         "on_previousUnitValue_changed": self._on_previous_unit_value_changed,
 159                         "on_writeUnitsMenuItem_activate": self._on_user_write_units,
 160                         "on_findButton_clicked": self._on_find_activate,
 161                         "on_findEntry_activated": self._on_find_activate,
 162                         "on_findEntry_changed": self._on_findEntry_changed,
 163                         "on_aboutMenuItem_activate": self._on_about_clicked,
 164                         "on_messagebox_ok_clicked": self.messagebox_ok_clicked,
 165                         "on_clearSelectionMenuItem_activate": self._on_user_clear_selections,
 166                         "on_unitsView_cursor_changed": self._on_click_unit,
 167                         "on_shortlistcheck_toggled": self._on_shortlist_changed,
 168                         "on_toggleShortList_activate": self._on_edit_shortlist,
 169                 }
 170                 widgets.signal_autoconnect(dic)
 171                 self._mainWindow.connect("key-press-event", self._on_key_press)
 172                 self._mainWindow.connect("window-state-event", self._on_window_state_change)
 173
 174                 self._mainWindow.set_title('gonvert- %s - Unit Conversion Utility' % constants.__version__)
 175                 iconPath = pixmapspath + '/gonvert.png'
 176                 if os.path.exists(iconPath):
 177                         self._mainWindow.set_icon(gtk.gdk.pixbuf_new_from_file(iconPath))
 178                 else:
 179                         _moduleLogger.warn("Error: Could not find gonvert icon: %s" % iconPath)
 180
 181                 self._load_settings()
 182
 183         def _load_settings(self):
 184                 #Restore window size from previously saved settings if it exists and is valid.
 185                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 186                 if os.path.exists(windowDatPath):
 187                         #Retrieving previous window settings from ~/.gonvert/window.dat
 188                         saved_window = pickle.load(open(windowDatPath, "r"))
 189                         #If the 'size' has been stored, then extract size from saved_window.
 190                         if 'size' in saved_window:
 191                                 a, b = saved_window['size']
 192                                 self._mainWindow.resize(a, b)
 193                         else:
 194                                 #Maximize if no previous size was found
 195                                 #self._mainWindow.maximize()
 196                                 pass
 197                 else:
 198                         #Maximize if no previous window.dat file was found
 199                         #self._mainWindow.maximize()
 200                         pass
 201
 202                 #Restore selections from previously saved settings if it exists and is valid.
 203                 historical_catergory_found = False
 204                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 205                 if os.path.exists(selectionsDatPath):
 206                         #Retrieving previous selections from ~/.gonvert/selections.dat
 207                         selections = pickle.load(open(selectionsDatPath, 'r'))
 208                         #Restoring previous selections.
 209                         #If the 'selected_unts' has been stored, then extract self._selected_units from selections.
 210                         if 'selected_units' in selections:
 211                                 self._selected_units = selections['selected_units']
 212                         #Make sure that the 'self._selected_category' has been stored.
 213                         if 'selected_category' in selections:
 214                                 #Match an available category to the previously selected category.
 215                                 for counter in range(len(unit_data.UNIT_CATEGORIES)):
 216                                         if selections['selected_category'] == unit_data.UNIT_CATEGORIES[counter]:
 217                                                 # Restore the previously selected category.
 218                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
 219                                                 self._categoryView.grab_focus()
 220                                 historical_catergory_found = True
 221
 222                 if not historical_catergory_found:
 223                         print "Couldn't find saved category, using default."
 224                         #If historical records were not kept then default to
 225                         # put the focus on the first category
 226                         self._categoryView.set_cursor(0, self._categoryColumn, False)
 227                         self._categoryView.grab_focus()
 228
 229                 self.restore_units()
 230
 231         def _save_settings(self):
 232                 """
 233                 This routine saves the selections to a file, and
 234                 should therefore only be called when exiting the program.
 235
 236                 Update selections dictionary which consists of the following keys:
 237                 'self._selected_category': full name of selected category
 238                 'self._selected_units': self._selected_units dictionary which contains:
 239                 [categoryname: #1 displayed unit, #2 displayed unit]
 240                 """
 241                 #Determine the contents of the selected category row
 242                 selected, iter = self._categoryView.get_selection().get_selected()
 243                 self._selected_category = self._categoryModel.get_value(iter, 0)
 244
 245                 selections = {
 246                         'selected_category': self._selected_category,
 247                         'selected_units': self._selected_units
 248                 }
 249                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 250                 pickle.dump(selections, open(selectionsDatPath, 'w'))
 251
 252                 #Get last size of app and save it
 253                 window_settings = {
 254                         'size': self._mainWindow.get_size()
 255                 }
 256                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 257                 pickle.dump(window_settings, open(windowDatPath, 'w'))
 258
 259         def _clear_find(self):
 260                 # switch to "new find" state
 261                 self._find_result = []
 262                 self._findIndex = 0
 263
 264                 # Clear our user message
 265                 self._findLabel.set_text('')
 266
 267         def _find_first(self):
 268                 assert len(self._find_result) == 0
 269                 assert self._findIndex == 0
 270                 findString = string.lower(string.strip(self._findEntry.get_text()))
 271                 if not findString:
 272                         return
 273
 274                 # Gather info on all the matching units from all categories
 275                 for catIndex, category in enumerate(unit_data.UNIT_CATEGORIES):
 276                         units = unit_data.get_units(category)
 277                         for unitIndex, unit in enumerate(units):
 278                                 loweredUnit = unit.lower()
 279                                 if loweredUnit in findString or findString in loweredUnit:
 280                                         self._find_result.append((category, unit, catIndex, unitIndex))
 281
 282         def _update_find_selection(self):
 283                 assert 0 < len(self._find_result)
 284
 285                 #check if next find is in a new category (prevent category changes when unnecessary
 286                 if self._selected_category != self._find_result[self._findIndex][0]:
 287                         self._categoryView.set_cursor(
 288                                 self._find_result[self._findIndex][2], self._categoryColumn, False
 289                         )
 290
 291                 self._unitsView.set_cursor(
 292                         self._find_result[self._findIndex][3], self._unitNameColumn, True
 293                 )
 294
 295         def _find_next(self):
 296                 """
 297                 check if 'new find' or 'last find' or 'next-find'
 298
 299                 new-find = run the find algorithm which also selects the first found unit
 300                          = self._findIndex = 0 and self._find_result = []
 301
 302                 last-find = restart from top again
 303                           = self._findIndex = len(self._find_result)
 304
 305                 next-find = continue to next found location
 306                            = self._findIndex = 0 and len(self._find_result)>0
 307                 """
 308                 if len(self._find_result) == 0:
 309                         self._find_first()
 310                 else:
 311                         if self._findIndex == len(self._find_result)-1:
 312                                 self._findIndex = 0
 313                         else:
 314                                 self._findIndex += 1
 315
 316                 if not self._find_result:
 317                         self._findLabel.set_text('Text not found')
 318                 else:
 319                         self._update_find_selection()
 320                         resultsLeft = len(self._find_result) - self._findIndex - 1
 321                         self._findLabel.set_text(
 322                                 '%s result(s) left' % (resultsLeft, )
 323                         )
 324
 325         def _find_previous(self):
 326                 """
 327                 check if 'new find' or 'last find' or 'next-find'
 328
 329                 new-find = run the find algorithm which also selects the first found unit
 330                          = self._findIndex = 0 and self._find_result = []
 331
 332                 last-find = restart from top again
 333                           = self._findIndex = len(self._find_result)
 334
 335                 next-find = continue to next found location
 336                            = self._findIndex = 0 and len(self._find_result)>0
 337                 """
 338                 if len(self._find_result) == 0:
 339                         self._find_first()
 340                 else:
 341                         if self._findIndex == 0:
 342                                 self._findIndex = len(self._find_result)-1
 343                         else:
 344                                 self._findIndex -= 1
 345
 346                 if not self._find_result:
 347                         self._findLabel.set_text('Text not found')
 348                 else:
 349                         self._update_find_selection()
 350                         resultsLeft = len(self._find_result) - self._findIndex - 1
 351                         self._findLabel.set_text(
 352                                 '%s result(s) left' % (resultsLeft, )
 353                         )
 354
 355         def _toggle_find(self):
 356                 if self._searchLayout.get_property("visible"):
 357                         self._searchLayout.hide()
 358                 else:
 359                         self._searchLayout.show()
 360
 361         def _on_shortlist_changed(self, *args):
 362                 try:
 363                         raise NotImplementedError("%s" % self._shortlistcheck.get_active())
 364                 except Exception:
 365                         _moduleLogger.exception("")
 366
 367         def _on_edit_shortlist(self, *args):
 368                 try:
 369                         raise NotImplementedError("%s" % self._toggleShortList.get_active())
 370                 except Exception:
 371                         _moduleLogger.exception("")
 372
 373         def _on_user_clear_selections(self, *args):
 374                 try:
 375                         selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 376                         os.remove(selectionsDatPath)
 377                         self._selected_units = {}
 378                 except Exception:
 379                         _moduleLogger.exception("")
 380
 381         def _on_key_press(self, widget, event, *args):
 382                 """
 383                 @note Hildon specific
 384                 """
 385                 RETURN_TYPES = (gtk.keysyms.Return, gtk.keysyms.ISO_Enter, gtk.keysyms.KP_Enter)
 386                 try:
 387                         if (
 388                                 event.keyval == gtk.keysyms.F6 or
 389                                 event.keyval in RETURN_TYPES and event.get_state() & gtk.gdk.CONTROL_MASK
 390                         ):
 391                                 if self._isFullScreen:
 392                                         self._mainWindow.unfullscreen()
 393                                 else:
 394                                         self._mainWindow.fullscreen()
 395                         elif event.keyval == gtk.keysyms.f and event.get_state() & gtk.gdk.CONTROL_MASK:
 396                                 self._toggle_find()
 397                         elif event.keyval == gtk.keysyms.p and event.get_state() & gtk.gdk.CONTROL_MASK:
 398                                 self._find_previous()
 399                         elif event.keyval == gtk.keysyms.n and event.get_state() & gtk.gdk.CONTROL_MASK:
 400                                 self._find_next()
 401                 except Exception, e:
 402                         _moduleLogger.exception("")
 403
 404         def _on_window_state_change(self, widget, event, *args):
 405                 """
 406                 @note Hildon specific
 407                 """
 408                 try:
 409                         if event.new_window_state & gtk.gdk.WINDOW_STATE_FULLSCREEN:
 410                                 self._isFullScreen = True
 411                         else:
 412                                 self._isFullScreen = False
 413                 except Exception, e:
 414                         _moduleLogger.exception("")
 415
 416         def _on_findEntry_changed(self, *args):
 417                 """
 418                 Clear out find results since the user wants to look for something new
 419                 """
 420                 try:
 421                         self._clear_find()
 422                 except Exception:
 423                         _moduleLogger.exception("")
 424
 425         def _on_find_activate(self, a):
 426                 try:
 427                         self._find_next()
 428                 except Exception:
 429                         _moduleLogger.exception("")
 430
 431         def _unit_model_cmp(self, sortedModel, leftItr, rightItr):
 432                 leftUnitText = self._unitModel.get_value(leftItr, 0)
 433                 rightUnitText = self._unitModel.get_value(rightItr, 0)
 434                 return cmp(leftUnitText, rightUnitText)
 435
 436         def _symbol_model_cmp(self, sortedModel, leftItr, rightItr):
 437                 leftSymbolText = self._unitModel.get_value(leftItr, 2)
 438                 rightSymbolText = self._unitModel.get_value(rightItr, 2)
 439                 return cmp(leftSymbolText, rightSymbolText)
 440
 441         def _value_model_cmp(self, sortedModel, leftItr, rightItr):
 442                 #special sorting exceptions for ascii values (instead of float values)
 443                 if self._selected_category == "Computer Numbers":
 444                         leftValue = self._unitModel.get_value(leftItr, 1)
 445                         rightValue = self._unitModel.get_value(rightItr, 1)
 446                 else:
 447                         leftValueText = self._unitModel.get_value(leftItr, 1)
 448                         leftValue = float(leftValueText) if leftValueText else 0.0
 449
 450                         rightValueText = self._unitModel.get_value(rightItr, 1)
 451                         rightValue = float(rightValueText) if rightValueText else 0.0
 452                 return cmp(leftValue, rightValue)
 453
 454         def _get_column_sort_stuff(self):
 455                 columns = (
 456                         (self._unitNameColumn, "_unit_sort_direction", self._unit_model_cmp),
 457                         (self._unitValueColumn, "_value_sort_direction", self._value_model_cmp),
 458                         (self._unitSymbolColumn, "_units_sort_direction", self._symbol_model_cmp),
 459                 )
 460                 return columns
 461
 462         def _on_click_unit_column(self, col):
 463                 """
 464                 Sort the contents of the col when the user clicks on the title.
 465                 """
 466                 try:
 467                         #Determine which column requires sorting
 468                         columns = self._get_column_sort_stuff()
 469                         for column, directionName, col_cmp in columns:
 470                                 column.set_sort_indicator(False)
 471                         for columnIndex, (maybeCol, directionName, col_cmp) in enumerate(columns):
 472                                 if col is maybeCol:
 473                                         direction = getattr(self, directionName)
 474                                         gtkDirection = gtk.SORT_ASCENDING if direction else gtk.SORT_DESCENDING
 475
 476                                         # cause a sort
 477                                         self._sortedUnitModel.set_sort_column_id(columnIndex, gtkDirection)
 478
 479                                         # set the visual for sorting
 480                                         col.set_sort_indicator(True)
 481                                         col.set_sort_order(not direction)
 482
 483                                         setattr(self, directionName, not direction)
 484                                         break
 485                         else:
 486                                 assert False, "Unknown column: %s" % (col.get_title(), )
 487                 except Exception:
 488                         _moduleLogger.exception("")
 489
 490         def _on_click_category(self, *args):
 491                 #Clear out the description
 492                 self._unitDescription.get_buffer().set_text("")
 493
 494                 #Determine the contents of the selected category row
 495                 selected, iter = self._categoryView.get_selection().get_selected()
 496                 self._selected_category = self._categoryModel.get_value(iter, 0)
 497
 498                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[self._selected_category]
 499
 500                 #Fill up the units descriptions and clear the value cells
 501                 self._unitModel.clear()
 502                 for key in unit_data.get_units(self._selected_category):
 503                         iter = self._unitModel.append()
 504                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
 505                 self._sortedUnitModel.sort_column_changed()
 506
 507                 self._unitName.set_text('')
 508                 self._unitValue.set_text('')
 509                 self._previousUnitName.set_text('')
 510                 self._previousUnitValue.set_text('')
 511                 self._unitSymbol.set_text('')
 512                 self._previousUnitSymbol.set_text('')
 513
 514                 self.restore_units()
 515
 516         def restore_units(self):
 517                 # Restore the previous historical settings of previously selected units in this newly selected category
 518                 #Since category has just been clicked, the list will be sorted already.
 519                 if self._selected_category in self._selected_units:
 520                         if self._selected_units[self._selected_category][0]:
 521                                 #self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
 522
 523                                 units = unit_data.UNIT_DESCRIPTIONS[self._selected_category].keys()
 524                                 units.sort()
 525                                 del units[0] # do not display .base_unit description key
 526
 527                                 #Restore oldest selection first.
 528                                 if self._selected_units[self._selected_category][1]:
 529                                         unit_no = 0
 530                                         for unit in units:
 531                                                 if unit == self._selected_units[self._selected_category][1]:
 532                                                         self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
 533                                                 unit_no = unit_no+1
 534
 535                                 #Restore newest selection second.
 536                                 unit_no = 0
 537                                 for unit in units:
 538                                         if unit == self._selected_units[self._selected_category][0]:
 539                                                 self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
 540                                         unit_no = unit_no+1
 541
 542                 # select the text so user can start typing right away
 543                 self._unitValue.grab_focus()
 544                 self._unitValue.select_region(0, -1)
 545
 546         def _on_click_unit(self, row):
 547                 self._calcsuppress = True #suppress calculations
 548
 549                 #Determine the contents of the selected row.
 550                 selected, iter = self._unitsView.get_selection().get_selected()
 551
 552                 selected_unit = selected.get_value(iter, 0)
 553
 554                 unit_spec = self._unitDataInCategory[selected_unit]
 555
 556                 #Clear out the description
 557                 text_model = gtk.TextBuffer(None)
 558                 self._unitDescription.set_buffer(text_model)
 559
 560                 enditer = text_model.get_end_iter()
 561                 text_model.insert(enditer, unit_spec[2])
 562
 563                 if self._unitName.get_text() != selected_unit:
 564                         self._previousUnitName.set_text(self._unitName.get_text())
 565                         self._previousUnitValue.set_text(self._unitValue.get_text())
 566                         if self._unitSymbol.get() == None:
 567                                 self._previousUnitSymbol.set_text('')
 568                         else:
 569                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
 570                 self._unitName.set_text(selected_unit)
 571
 572                 self._unitValue.set_text(selected.get_value(iter, 1))
 573
 574                 self._unitSymbol.set_text(unit_spec[1]) # put units into label text
 575                 if self._unitValue.get_text() == '':
 576                         if self._selected_category == "Computer Numbers":
 577                                 self._unitValue.set_text("0")
 578                         else:
 579                                 self._unitValue.set_text("0.0")
 580
 581                 #For historical purposes, record this unit as the most recent one in this category.
 582                 # Also, if a previous unit exists, then shift that previous unit to oldest unit.
 583                 if self._selected_category in self._selected_units:
 584                         if self._selected_units[self._selected_category][0]:
 585                                 self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
 586                 else:
 587                         self._selected_units[self._selected_category] = [selected_unit, '']
 588
 589                 # select the text so user can start typing right away
 590                 self._unitValue.grab_focus()
 591                 self._unitValue.select_region(0, -1)
 592
 593                 self._calcsuppress = False #enable calculations
 594
 595         def messagebox_ok_clicked(self, a):
 596                 messagebox.hide()
 597
 598         def _on_user_write_units(self, a):
 599                 ''"Write the list of categories and units to stdout for documentation purposes.''"
 600                 messagebox_model = gtk.TextBuffer(None)
 601                 messageboxtext.set_buffer(messagebox_model)
 602                 messagebox_model.insert_at_cursor(_(u'The units are being written to stdout. You can capture this printout by starting gonvert from the command line as follows: \n$ gonvert > file.txt'), -1)
 603                 messagebox.show()
 604                 while gtk.events_pending():
 605                         gtk.mainiteration(False)
 606
 607                 total_categories = 0
 608                 total_units = 0
 609                 print 'gonvert-%s%s' % (
 610                         constants.__version__,
 611                         _(u' - Unit Conversion Utility  - Convertible units listing: ')
 612                 )
 613                 for category_key in unit_data.UNIT_CATEGORIES:
 614                         total_categories = total_categories + 1
 615                         print category_key, ": "
 616                         self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[category_key]
 617                         unit_keys = self._unitDataInCategory.keys()
 618                         unit_keys.sort()
 619                         del unit_keys[0] # do not display .base_unit description key
 620                         for unit_key in unit_keys:
 621                                 total_units = total_units + 1
 622                                 print "\t", unit_key
 623                 print total_categories, ' categories'
 624                 print total_units, ' units'
 625
 626         def _on_unit_value_changed(self, a):
 627                 if self._calcsuppress:
 628                         #self._calcsuppress = False
 629                         return
 630                 # determine if value to be calculated is empty
 631                 if self._selected_category == "Computer Numbers":
 632                         if self._unitValue.get_text() == '':
 633                                 value = '0'
 634                         else:
 635                                 value = self._unitValue.get_text()
 636                 else:
 637                         if self._unitValue.get_text() == '':
 638                                 value = 0.0
 639                         else:
 640                                 value = float(self._unitValue.get_text())
 641
 642                 if self._unitName.get_text() != '':
 643                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 644                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 645
 646                         keys = self._unitDataInCategory.keys()
 647                         keys.sort()
 648                         del keys[0]
 649                         row = 0
 650
 651                         #point to the first row
 652                         iter = self._unitModel.get_iter_first()
 653
 654                         while iter:
 655                                 #get the formula from the name at the row
 656                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 657
 658                                 #set the result in the value column
 659                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 660
 661                                 #point to the next row in the self._unitModel
 662                                 iter = self._unitModel.iter_next(iter)
 663
 664                         # if the second row has a unit then update its value
 665                         if self._previousUnitName.get_text() != '':
 666                                 self._calcsuppress = True
 667                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 668                                 self._previousUnitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 669                                 self._calcsuppress = False
 670
 671         def _on_previous_unit_value_changed(self, a):
 672                 if self._calcsuppress == True:
 673                         #self._calcsuppress = False
 674                         return
 675                 # determine if value to be calculated is empty
 676                 if self._selected_category == "Computer Numbers":
 677                         if self._previousUnitValue.get_text() == '':
 678                                 value = '0'
 679                         else:
 680                                 value = self._previousUnitValue.get_text()
 681                 else:
 682                         if self._previousUnitValue.get_text() == '':
 683                                 value = 0.0
 684                         else:
 685                                 value = float(self._previousUnitValue.get_text())
 686
 687                 if self._previousUnitName.get_text() != '':
 688                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 689                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 690
 691                         keys = self._unitDataInCategory.keys()
 692                         keys.sort()
 693                         del keys[0]
 694                         row = 0
 695
 696                         #point to the first row
 697                         iter = self._unitModel.get_iter_first()
 698
 699                         while iter:
 700                                 #get the formula from the name at the row
 701                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 702
 703                                 #set the result in the value column
 704                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 705
 706                                 #point to the next row in the self._unitModel
 707                                 iter = self._unitModel.iter_next(iter)
 708
 709                         # if the second row has a unit then update its value
 710                         if self._unitName.get_text() != '':
 711                                 self._calcsuppress = True
 712                                 func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 713                                 self._unitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 714                                 self._calcsuppress = False
 715
 716         def _on_about_clicked(self, a):
 717                 dlg = gtk.AboutDialog()
 718                 dlg.set_name(constants.__pretty_app_name__)
 719                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
 720                 dlg.set_copyright("Copyright 2009 - GPL")
 721                 dlg.set_comments("")
 722                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
 723                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
 724                 dlg.run()
 725                 dlg.destroy()
 726
 727         def _on_user_exit(self, *args):
 728                 try:
 729                         self._save_settings()
 730                 except Exception:
 731                         _moduleLogger.exception("")
 732                 finally:
 733                         gtk.main_quit()
 734
 735
 736 def main():
 737         logging.basicConfig(level = logging.DEBUG)
 738         try:
 739                 os.makedirs(constants._data_path_)
 740         except OSError, e:
 741                 if e.errno != 17:
 742                         raise
 743
 744         gonvert = Gonvert()
 745         gtk.main()
 746
 747
 748 if __name__ == "__main__":
 749         main()