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._selectedCategory = '' # 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, 'writeUnitsMenuItem', _('Write Units'))
  73                 change_menu_label(widgets, 'helpMenuItem', _('Help'))
  74                 change_menu_label(widgets, 'aboutMenuItem', _('About'))
  75                 change_menu_label(widgets, 'findButton', _('Find'))
  76
  77                 self._shortlistcheck = widgets.get_widget('shortlistcheck')
  78                 self._toggleShortList = widgets.get_widget('toggleShortList')
  79
  80                 self._categoryView = widgets.get_widget('categoryView')
  81
  82                 self._unitsView = widgets.get_widget('unitsView')
  83                 self._unitsView.set_property('rules_hint', 1)
  84                 self._unitsView_selection = self._unitsView.get_selection()
  85
  86                 self._unitName = widgets.get_widget('unitName')
  87                 self._unitValue = widgets.get_widget('unitValue')
  88                 self._previousUnitName = widgets.get_widget('previousUnitName')
  89                 self._previousUnitValue = widgets.get_widget('previousUnitValue')
  90                 messagebox = widgets.get_widget('msgbox')
  91                 messageboxtext = widgets.get_widget('msgboxtext')
  92
  93                 self._unitSymbol = widgets.get_widget('unitSymbol')
  94                 self._previousUnitSymbol = widgets.get_widget('previousUnitSymbol')
  95
  96                 self._unitDescription = widgets.get_widget('unitDescription')
  97
  98                 self._searchLayout = widgets.get_widget('searchLayout')
  99                 self._searchLayout.hide()
 100                 self._findEntry = widgets.get_widget('findEntry')
 101                 self._findLabel = widgets.get_widget('findLabel')
 102                 self._findButton = widgets.get_widget('findButton')
 103                 ToolTips = gtk.Tooltips()
 104                 ToolTips.set_tip(self._findButton, _(u'Find unit (F6)'))
 105
 106                 #insert a self._categoryColumnumn into the units list even though the heading will not be seen
 107                 renderer = gtk.CellRendererText()
 108                 self._unitNameColumn = gtk.TreeViewColumn(_('Unit Name'), renderer)
 109                 self._unitNameColumn.set_property('resizable', 1)
 110                 self._unitNameColumn.add_attribute(renderer, 'text', 0)
 111                 self._unitNameColumn.set_clickable(True)
 112                 self._unitNameColumn.connect("clicked", self._on_click_unit_column)
 113                 self._unitsView.append_column(self._unitNameColumn)
 114
 115                 self._unitValueColumn = gtk.TreeViewColumn(_('Value'), renderer)
 116                 self._unitValueColumn.set_property('resizable', 1)
 117                 self._unitValueColumn.add_attribute(renderer, 'text', 1)
 118                 self._unitValueColumn.set_clickable(True)
 119                 self._unitValueColumn.connect("clicked", self._on_click_unit_column)
 120                 self._unitsView.append_column(self._unitValueColumn)
 121
 122                 self._unitSymbolColumn = gtk.TreeViewColumn(_('Units'), renderer)
 123                 self._unitSymbolColumn.set_property('resizable', 1)
 124                 self._unitSymbolColumn.add_attribute(renderer, 'text', 2)
 125                 self._unitSymbolColumn.set_clickable(True)
 126                 self._unitSymbolColumn.connect("clicked", self._on_click_unit_column)
 127                 self._unitsView.append_column(self._unitSymbolColumn)
 128
 129                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 130                 self._sortedUnitModel = gtk.TreeModelSort(self._unitModel)
 131                 columns = self._get_column_sort_stuff()
 132                 for columnIndex, (column, sortDirection, col_cmp) in enumerate(columns):
 133                         self._sortedUnitModel.set_sort_func(columnIndex, col_cmp)
 134                 self._unitsView.set_model(self._sortedUnitModel)
 135
 136                 #Insert a column into the category list even though the heading will not be seen
 137                 renderer = gtk.CellRendererText()
 138                 self._categoryColumn = gtk.TreeViewColumn('Title', renderer)
 139                 self._categoryColumn.set_property('resizable', 1)
 140                 self._categoryColumn.add_attribute(renderer, 'text', 0)
 141                 self._categoryView.append_column(self._categoryColumn)
 142
 143                 self._categoryModel = gtk.ListStore(gobject.TYPE_STRING)
 144                 self._categoryView.set_model(self._categoryModel)
 145                 #colourize each row differently for easier reading
 146                 self._categoryView.set_property('rules_hint', 1)
 147
 148                 #Populate the catagories list
 149                 for key in unit_data.UNIT_CATEGORIES:
 150                         iter = self._categoryModel.append()
 151                         self._categoryModel.set(iter, 0, key)
 152
 153                 #--------- connections to GUI ----------------
 154                 dic = {
 155                         "on_exit_menu_activate": self._on_user_exit,
 156                         "on_main_window_destroy": self._on_user_exit,
 157                         "on_categoryView_select_row": self._on_click_category,
 158                         "on_unitValue_changed": self._on_unit_value_changed,
 159                         "on_previousUnitValue_changed": self._on_previous_unit_value_changed,
 160                         "on_writeUnitsMenuItem_activate": self._on_user_write_units,
 161                         "on_findButton_clicked": self._on_find_activate,
 162                         "on_findEntry_activated": self._on_find_activate,
 163                         "on_findEntry_changed": self._on_findEntry_changed,
 164                         "on_aboutMenuItem_activate": self._on_about_clicked,
 165                         "on_messagebox_ok_clicked": self.messagebox_ok_clicked,
 166                         "on_clearSelectionMenuItem_activate": self._on_user_clear_selections,
 167                         "on_unitsView_cursor_changed": self._on_click_unit,
 168                         "on_shortlistcheck_toggled": self._on_shortlist_changed,
 169                         "on_toggleShortList_activate": self._on_edit_shortlist,
 170                 }
 171                 widgets.signal_autoconnect(dic)
 172                 self._mainWindow.connect("key-press-event", self._on_key_press)
 173                 self._mainWindow.connect("window-state-event", self._on_window_state_change)
 174
 175                 self._mainWindow.set_title('gonvert- %s - Unit Conversion Utility' % constants.__version__)
 176                 iconPath = pixmapspath + '/gonvert.png'
 177                 if os.path.exists(iconPath):
 178                         self._mainWindow.set_icon(gtk.gdk.pixbuf_new_from_file(iconPath))
 179                 else:
 180                         _moduleLogger.warn("Error: Could not find gonvert icon: %s" % iconPath)
 181
 182                 self._load_settings()
 183
 184         def _load_settings(self):
 185                 #Restore window size from previously saved settings if it exists and is valid.
 186                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 187                 if os.path.exists(windowDatPath):
 188                         #Retrieving previous window settings from ~/.gonvert/window.dat
 189                         saved_window = pickle.load(open(windowDatPath, "r"))
 190                         #If the 'size' has been stored, then extract size from saved_window.
 191                         if 'size' in saved_window:
 192                                 a, b = saved_window['size']
 193                                 self._mainWindow.resize(a, b)
 194                         else:
 195                                 #Maximize if no previous size was found
 196                                 #self._mainWindow.maximize()
 197                                 pass
 198                 else:
 199                         #Maximize if no previous window.dat file was found
 200                         #self._mainWindow.maximize()
 201                         pass
 202
 203                 #Restore selections from previously saved settings if it exists and is valid.
 204                 historical_catergory_found = False
 205                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 206                 if os.path.exists(selectionsDatPath):
 207                         #Retrieving previous selections from ~/.gonvert/selections.dat
 208                         selections = pickle.load(open(selectionsDatPath, 'r'))
 209                         #Restoring previous selections.
 210                         #If the 'selected_unts' has been stored, then extract self._defaultUnitForCategory from selections.
 211                         if 'selected_units' in selections:
 212                                 self._defaultUnitForCategory = selections['selected_units']
 213                         #Make sure that the 'self._selectedCategory' has been stored.
 214                         if 'selected_category' in selections:
 215                                 #Match an available category to the previously selected category.
 216                                 for counter in range(len(unit_data.UNIT_CATEGORIES)):
 217                                         if selections['selected_category'] == unit_data.UNIT_CATEGORIES[counter]:
 218                                                 # Restore the previously selected category.
 219                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
 220                                                 self._categoryView.grab_focus()
 221                                 historical_catergory_found = True
 222
 223                 if not historical_catergory_found:
 224                         print "Couldn't find saved category, using default."
 225                         #If historical records were not kept then default to
 226                         # put the focus on the first category
 227                         self._categoryView.set_cursor(0, self._categoryColumn, False)
 228                         self._categoryView.grab_focus()
 229
 230                 self._select_default_unit()
 231
 232         def _save_settings(self):
 233                 """
 234                 This routine saves the selections to a file, and
 235                 should therefore only be called when exiting the program.
 236
 237                 Update selections dictionary which consists of the following keys:
 238                 'self._selectedCategory': full name of selected category
 239                 'self._defaultUnitForCategory': self._defaultUnitForCategory dictionary which contains:
 240                 [categoryname: #1 displayed unit, #2 displayed unit]
 241                 """
 242                 #Determine the contents of the selected category row
 243                 selected, iter = self._categoryView.get_selection().get_selected()
 244                 self._selectedCategory = self._categoryModel.get_value(iter, 0)
 245
 246                 selections = {
 247                         'selected_category': self._selectedCategory,
 248                         'selected_units': self._defaultUnitForCategory
 249                 }
 250                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 251                 pickle.dump(selections, open(selectionsDatPath, 'w'))
 252
 253                 #Get last size of app and save it
 254                 window_settings = {
 255                         'size': self._mainWindow.get_size()
 256                 }
 257                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 258                 pickle.dump(window_settings, open(windowDatPath, 'w'))
 259
 260         def _clear_find(self):
 261                 # switch to "new find" state
 262                 self._find_result = []
 263                 self._findIndex = 0
 264
 265                 # Clear our user message
 266                 self._findLabel.set_text('')
 267
 268         def _find_first(self):
 269                 assert len(self._find_result) == 0
 270                 assert self._findIndex == 0
 271                 findString = string.lower(string.strip(self._findEntry.get_text()))
 272                 if not findString:
 273                         return
 274
 275                 # Gather info on all the matching units from all categories
 276                 for catIndex, category in enumerate(unit_data.UNIT_CATEGORIES):
 277                         units = unit_data.get_units(category)
 278                         for unitIndex, unit in enumerate(units):
 279                                 loweredUnit = unit.lower()
 280                                 if loweredUnit in findString or findString in loweredUnit:
 281                                         self._find_result.append((category, unit, catIndex, unitIndex))
 282
 283         def _update_find_selection(self):
 284                 assert 0 < len(self._find_result)
 285
 286                 #check if next find is in a new category (prevent category changes when unnecessary
 287                 if self._selectedCategory != self._find_result[self._findIndex][0]:
 288                         self._categoryView.set_cursor(
 289                                 self._find_result[self._findIndex][2], self._categoryColumn, False
 290                         )
 291
 292                 self._unitsView.set_cursor(
 293                         self._find_result[self._findIndex][3], self._unitNameColumn, True
 294                 )
 295
 296         def _find_next(self):
 297                 """
 298                 check if 'new find' or 'last find' or 'next-find'
 299
 300                 new-find = run the find algorithm which also selects the first found unit
 301                          = self._findIndex = 0 and self._find_result = []
 302
 303                 last-find = restart from top again
 304                           = self._findIndex = len(self._find_result)
 305
 306                 next-find = continue to next found location
 307                            = self._findIndex = 0 and len(self._find_result)>0
 308                 """
 309                 if len(self._find_result) == 0:
 310                         self._find_first()
 311                 else:
 312                         if self._findIndex == len(self._find_result)-1:
 313                                 self._findIndex = 0
 314                         else:
 315                                 self._findIndex += 1
 316
 317                 if not self._find_result:
 318                         self._findLabel.set_text('Text not found')
 319                 else:
 320                         self._update_find_selection()
 321                         resultsLeft = len(self._find_result) - self._findIndex - 1
 322                         self._findLabel.set_text(
 323                                 '%s result(s) left' % (resultsLeft, )
 324                         )
 325
 326         def _find_previous(self):
 327                 """
 328                 check if 'new find' or 'last find' or 'next-find'
 329
 330                 new-find = run the find algorithm which also selects the first found unit
 331                          = self._findIndex = 0 and self._find_result = []
 332
 333                 last-find = restart from top again
 334                           = self._findIndex = len(self._find_result)
 335
 336                 next-find = continue to next found location
 337                            = self._findIndex = 0 and len(self._find_result)>0
 338                 """
 339                 if len(self._find_result) == 0:
 340                         self._find_first()
 341                 else:
 342                         if self._findIndex == 0:
 343                                 self._findIndex = len(self._find_result)-1
 344                         else:
 345                                 self._findIndex -= 1
 346
 347                 if not self._find_result:
 348                         self._findLabel.set_text('Text not found')
 349                 else:
 350                         self._update_find_selection()
 351                         resultsLeft = len(self._find_result) - self._findIndex - 1
 352                         self._findLabel.set_text(
 353                                 '%s result(s) left' % (resultsLeft, )
 354                         )
 355
 356         def _toggle_find(self):
 357                 if self._searchLayout.get_property("visible"):
 358                         self._searchLayout.hide()
 359                 else:
 360                         self._searchLayout.show()
 361
 362         def _unit_model_cmp(self, sortedModel, leftItr, rightItr):
 363                 leftUnitText = self._unitModel.get_value(leftItr, 0)
 364                 rightUnitText = self._unitModel.get_value(rightItr, 0)
 365                 return cmp(leftUnitText, rightUnitText)
 366
 367         def _symbol_model_cmp(self, sortedModel, leftItr, rightItr):
 368                 leftSymbolText = self._unitModel.get_value(leftItr, 2)
 369                 rightSymbolText = self._unitModel.get_value(rightItr, 2)
 370                 return cmp(leftSymbolText, rightSymbolText)
 371
 372         def _value_model_cmp(self, sortedModel, leftItr, rightItr):
 373                 #special sorting exceptions for ascii values (instead of float values)
 374                 if self._selectedCategory == "Computer Numbers":
 375                         leftValue = self._unitModel.get_value(leftItr, 1)
 376                         rightValue = self._unitModel.get_value(rightItr, 1)
 377                 else:
 378                         leftValueText = self._unitModel.get_value(leftItr, 1)
 379                         leftValue = float(leftValueText) if leftValueText else 0.0
 380
 381                         rightValueText = self._unitModel.get_value(rightItr, 1)
 382                         rightValue = float(rightValueText) if rightValueText else 0.0
 383                 return cmp(leftValue, rightValue)
 384
 385         def _get_column_sort_stuff(self):
 386                 columns = (
 387                         (self._unitNameColumn, "_unit_sort_direction", self._unit_model_cmp),
 388                         (self._unitValueColumn, "_value_sort_direction", self._value_model_cmp),
 389                         (self._unitSymbolColumn, "_units_sort_direction", self._symbol_model_cmp),
 390                 )
 391                 return columns
 392
 393         def _switch_category(self, category):
 394                 self._selectedCategory = category
 395                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[self._selectedCategory]
 396
 397                 #Fill up the units descriptions and clear the value cells
 398                 self._clear_visible_unit_data()
 399                 for key in unit_data.get_units(self._selectedCategory):
 400                         iter = self._unitModel.append()
 401                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
 402                 self._sortedUnitModel.sort_column_changed()
 403
 404                 self._select_default_unit()
 405
 406         def _clear_visible_unit_data(self):
 407                 self._unitDescription.get_buffer().set_text("")
 408                 self._unitName.set_text('')
 409                 self._unitValue.set_text('')
 410                 self._unitSymbol.set_text('')
 411
 412                 self._previousUnitName.set_text('')
 413                 self._previousUnitValue.set_text('')
 414                 self._previousUnitSymbol.set_text('')
 415
 416                 self._unitModel.clear()
 417
 418         def _select_default_unit(self):
 419                 # Restore the previous historical settings of previously selected units
 420                 # in this newly selected category
 421                 if self._selectedCategory in self._defaultUnitForCategory:
 422                         units = unit_data.get_units(self._selectedCategory)
 423
 424                         #Restore oldest selection first.
 425                         if self._defaultUnitForCategory[self._selectedCategory][1]:
 426                                 unitIndex = units.index(self._defaultUnitForCategory[self._selectedCategory][1])
 427                                 self._unitsView.set_cursor(unitIndex, self._unitNameColumn, True)
 428
 429                         #Restore newest selection second.
 430                         if self._defaultUnitForCategory[self._selectedCategory][0]:
 431                                 unitIndex = units.index(self._defaultUnitForCategory[self._selectedCategory][0])
 432                                 self._unitsView.set_cursor(unitIndex, self._unitNameColumn, True)
 433
 434                 # select the text so user can start typing right away
 435                 self._unitValue.grab_focus()
 436                 self._unitValue.select_region(0, -1)
 437
 438         def _sanitize_value(self, userEntry):
 439                 if self._selectedCategory == "Computer Numbers":
 440                         if userEntry == '':
 441                                 value = '0'
 442                         else:
 443                                 value = userEntry
 444                 else:
 445                         if userEntry == '':
 446                                 value = 0.0
 447                         else:
 448                                 value = float(userEntry)
 449                 return value
 450
 451         def _on_shortlist_changed(self, *args):
 452                 try:
 453                         raise NotImplementedError("%s" % self._shortlistcheck.get_active())
 454                 except Exception:
 455                         _moduleLogger.exception("")
 456
 457         def _on_edit_shortlist(self, *args):
 458                 try:
 459                         raise NotImplementedError("%s" % self._toggleShortList.get_active())
 460                 except Exception:
 461                         _moduleLogger.exception("")
 462
 463         def _on_user_clear_selections(self, *args):
 464                 try:
 465                         selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 466                         os.remove(selectionsDatPath)
 467                         self._defaultUnitForCategory = {}
 468                 except Exception:
 469                         _moduleLogger.exception("")
 470
 471         def _on_key_press(self, widget, event, *args):
 472                 """
 473                 @note Hildon specific
 474                 """
 475                 RETURN_TYPES = (gtk.keysyms.Return, gtk.keysyms.ISO_Enter, gtk.keysyms.KP_Enter)
 476                 try:
 477                         if (
 478                                 event.keyval == gtk.keysyms.F6 or
 479                                 event.keyval in RETURN_TYPES and event.get_state() & gtk.gdk.CONTROL_MASK
 480                         ):
 481                                 if self._isFullScreen:
 482                                         self._mainWindow.unfullscreen()
 483                                 else:
 484                                         self._mainWindow.fullscreen()
 485                         elif event.keyval == gtk.keysyms.f and event.get_state() & gtk.gdk.CONTROL_MASK:
 486                                 self._toggle_find()
 487                         elif event.keyval == gtk.keysyms.p and event.get_state() & gtk.gdk.CONTROL_MASK:
 488                                 self._find_previous()
 489                         elif event.keyval == gtk.keysyms.n and event.get_state() & gtk.gdk.CONTROL_MASK:
 490                                 self._find_next()
 491                 except Exception, e:
 492                         _moduleLogger.exception("")
 493
 494         def _on_window_state_change(self, widget, event, *args):
 495                 """
 496                 @note Hildon specific
 497                 """
 498                 try:
 499                         if event.new_window_state & gtk.gdk.WINDOW_STATE_FULLSCREEN:
 500                                 self._isFullScreen = True
 501                         else:
 502                                 self._isFullScreen = False
 503                 except Exception, e:
 504                         _moduleLogger.exception("")
 505
 506         def _on_findEntry_changed(self, *args):
 507                 """
 508                 Clear out find results since the user wants to look for something new
 509                 """
 510                 try:
 511                         self._clear_find()
 512                 except Exception:
 513                         _moduleLogger.exception("")
 514
 515         def _on_find_activate(self, *args):
 516                 try:
 517                         self._find_next()
 518                         self._findButton.grab_focus()
 519                 except Exception:
 520                         _moduleLogger.exception("")
 521
 522         def _on_click_unit_column(self, col):
 523                 """
 524                 Sort the contents of the col when the user clicks on the title.
 525                 """
 526                 try:
 527                         #Determine which column requires sorting
 528                         columns = self._get_column_sort_stuff()
 529                         for columnIndex, (maybeCol, directionName, col_cmp) in enumerate(columns):
 530                                 if col is maybeCol:
 531                                         direction = getattr(self, directionName)
 532                                         gtkDirection = gtk.SORT_ASCENDING if direction else gtk.SORT_DESCENDING
 533
 534                                         # cause a sort
 535                                         self._sortedUnitModel.set_sort_column_id(columnIndex, gtkDirection)
 536
 537                                         # set the visual for sorting
 538                                         col.set_sort_indicator(True)
 539                                         col.set_sort_order(not direction)
 540
 541                                         setattr(self, directionName, not direction)
 542                                         break
 543                                 else:
 544                                         maybeCol.set_sort_indicator(False)
 545                         else:
 546                                 assert False, "Unknown column: %s" % (col.get_title(), )
 547                 except Exception:
 548                         _moduleLogger.exception("")
 549
 550         def _on_click_category(self, *args):
 551                 try:
 552                         selected, iter = self._categoryView.get_selection().get_selected()
 553                         selectedCategory = self._categoryModel.get_value(iter, 0)
 554                         self._switch_category(selectedCategory)
 555                 except Exception:
 556                         _moduleLogger.exception("")
 557
 558         def _on_click_unit(self, *args):
 559                 try:
 560                         selected, iter = self._unitsView.get_selection().get_selected()
 561                         selected_unit = selected.get_value(iter, 0)
 562                         unit_spec = self._unitDataInCategory[selected_unit]
 563
 564                         if self._unitName.get_text() != selected_unit:
 565                                 self._previousUnitName.set_text(self._unitName.get_text())
 566                                 self._previousUnitValue.set_text(self._unitValue.get_text())
 567                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
 568
 569                         self._unitName.set_text(selected_unit)
 570                         self._unitValue.set_text(selected.get_value(iter, 1))
 571                         buffer = self._unitDescription.get_buffer()
 572                         buffer.set_text(unit_spec[2])
 573                         self._unitSymbol.set_text(unit_spec[1]) # put units into label text
 574
 575                         if self._unitValue.get_text() == '':
 576                                 if self._selectedCategory == "Computer Numbers":
 577                                         self._unitValue.set_text("0")
 578                                 else:
 579                                         self._unitValue.set_text("0.0")
 580
 581                         self._defaultUnitForCategory[self._selectedCategory] = [
 582                                 self._unitName.get_text(), self._previousUnitName.get_text()
 583                         ]
 584
 585                         # select the text so user can start typing right away
 586                         self._unitValue.grab_focus()
 587                         self._unitValue.select_region(0, -1)
 588                 except Exception:
 589                         _moduleLogger.exception("")
 590
 591         def _on_unit_value_changed(self, *args):
 592                 try:
 593                         if self._unitName.get_text() == '':
 594                                 return
 595                         if not self._unitValue.is_focus():
 596                                 return
 597
 598                         value = self._sanitize_value(self._unitValue.get_text())
 599
 600                         #retrieve the conversion function and value from the selected unit
 601                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 602                         base = func.to_base(value, arg)
 603
 604                         #point to the first row
 605                         for row in self._unitModel:
 606                                 func, arg = self._unitDataInCategory[row[0]][0]
 607                                 row[1] = str(func.from_base(base, arg))
 608
 609                         if self._previousUnitName.get_text() != '':
 610                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 611                                 self._previousUnitValue.set_text(str(func.from_base(base, arg, )))
 612                 except Exception:
 613                         _moduleLogger.exception("")
 614
 615         def _on_previous_unit_value_changed(self, *args):
 616                 try:
 617                         if self._previousUnitName.get_text() == '':
 618                                 return
 619                         if not self._previousUnitValue.is_focus():
 620                                 return
 621
 622                         value = self._sanitize_value(self._previousUnitValue.get_text())
 623
 624                         #retrieve the conversion function and value from the selected unit
 625                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 626                         base = func.to_base(value, arg)
 627
 628                         #point to the first row
 629                         for row in self._unitModel:
 630                                 func, arg = self._unitDataInCategory[row[0]][0]
 631                                 row[1] = str(func.from_base(base, arg))
 632
 633                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 634                         self._unitValue.set_text(str(func.from_base(base, arg, )))
 635                 except Exception:
 636                         _moduleLogger.exception("")
 637
 638         def messagebox_ok_clicked(self, a):
 639                 messagebox.hide()
 640
 641         def _on_user_write_units(self, a):
 642                 ''"Write the list of categories and units to stdout for documentation purposes.''"
 643                 messagebox_model = gtk.TextBuffer(None)
 644                 messageboxtext.set_buffer(messagebox_model)
 645                 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)
 646                 messagebox.show()
 647                 while gtk.events_pending():
 648                         gtk.mainiteration(False)
 649
 650                 total_categories = 0
 651                 total_units = 0
 652                 print 'gonvert-%s%s' % (
 653                         constants.__version__,
 654                         _(u' - Unit Conversion Utility  - Convertible units listing: ')
 655                 )
 656                 for category_key in unit_data.UNIT_CATEGORIES:
 657                         total_categories = total_categories + 1
 658                         print category_key, ": "
 659                         self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[category_key]
 660                         unit_keys = unit_data.get_units_from_category(self._unitDataInCategory)
 661                         for unit_key in unit_keys:
 662                                 total_units = total_units + 1
 663                                 print "\t", unit_key
 664                 print total_categories, ' categories'
 665                 print total_units, ' units'
 666
 667         def _on_about_clicked(self, a):
 668                 dlg = gtk.AboutDialog()
 669                 dlg.set_name(constants.__pretty_app_name__)
 670                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
 671                 dlg.set_copyright("Copyright 2009 - GPL")
 672                 dlg.set_comments("")
 673                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
 674                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
 675                 dlg.run()
 676                 dlg.destroy()
 677
 678         def _on_user_exit(self, *args):
 679                 try:
 680                         self._save_settings()
 681                 except Exception:
 682                         _moduleLogger.exception("")
 683                 finally:
 684                         gtk.main_quit()
 685
 686
 687 def main():
 688         logging.basicConfig(level = logging.DEBUG)
 689         try:
 690                 os.makedirs(constants._data_path_)
 691         except OSError, e:
 692                 if e.errno != 17:
 693                         raise
 694
 695         gonvert = Gonvert()
 696         gtk.main()
 697
 698
 699 if __name__ == "__main__":
 700         main()