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._selectedCategory = '' # preset to no selected category
  52                 self._defaultUnitForCategory = {} # 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                         _moduleLogger.error("UI Descriptor not found!")
  64                         gtk.main_quit()
  65                         return
  66
  67                 self._mainWindow = widgets.get_widget('mainWindow')
  68
  69                 change_menu_label(widgets, 'fileMenuItem', _('File'))
  70                 change_menu_label(widgets, 'exitMenuItem', _('Exit'))
  71                 change_menu_label(widgets, 'toolsMenuItem', _('Tools'))
  72                 change_menu_label(widgets, 'clearSelectionMenuItem', _('Clear selections'))
  73                 change_menu_label(widgets, 'writeUnitsMenuItem', _('Write Units'))
  74                 change_menu_label(widgets, 'helpMenuItem', _('Help'))
  75                 change_menu_label(widgets, 'aboutMenuItem', _('About'))
  76                 change_menu_label(widgets, 'findButton', _('Find'))
  77
  78                 self._shortlistcheck = widgets.get_widget('shortlistcheck')
  79                 self._toggleShortList = widgets.get_widget('toggleShortList')
  80
  81                 self._categoryView = widgets.get_widget('categoryView')
  82
  83                 self._unitsView = widgets.get_widget('unitsView')
  84                 self._unitsView.set_property('rules_hint', 1)
  85                 self._unitsView_selection = self._unitsView.get_selection()
  86
  87                 self._unitName = widgets.get_widget('unitName')
  88                 self._unitValue = widgets.get_widget('unitValue')
  89                 self._previousUnitName = widgets.get_widget('previousUnitName')
  90                 self._previousUnitValue = widgets.get_widget('previousUnitValue')
  91                 messagebox = widgets.get_widget('msgbox')
  92                 messageboxtext = widgets.get_widget('msgboxtext')
  93
  94                 self._unitSymbol = widgets.get_widget('unitSymbol')
  95                 self._previousUnitSymbol = widgets.get_widget('previousUnitSymbol')
  96
  97                 self._unitDescription = widgets.get_widget('unitDescription')
  98
  99                 self._searchLayout = widgets.get_widget('searchLayout')
 100                 self._searchLayout.hide()
 101                 self._findEntry = widgets.get_widget('findEntry')
 102                 self._findLabel = widgets.get_widget('findLabel')
 103                 self._findButton = widgets.get_widget('findButton')
 104                 ToolTips = gtk.Tooltips()
 105                 ToolTips.set_tip(self._findButton, _(u'Find unit (F6)'))
 106
 107                 #insert a self._categoryColumnumn into the units list even though the heading will not be seen
 108                 renderer = gtk.CellRendererText()
 109                 self._unitNameColumn = gtk.TreeViewColumn(_('Unit Name'), renderer)
 110                 self._unitNameColumn.set_property('resizable', 1)
 111                 self._unitNameColumn.add_attribute(renderer, 'text', 0)
 112                 self._unitNameColumn.set_clickable(True)
 113                 self._unitNameColumn.connect("clicked", self._on_click_unit_column)
 114                 self._unitsView.append_column(self._unitNameColumn)
 115
 116                 self._unitValueColumn = gtk.TreeViewColumn(_('Value'), renderer)
 117                 self._unitValueColumn.set_property('resizable', 1)
 118                 self._unitValueColumn.add_attribute(renderer, 'text', 1)
 119                 self._unitValueColumn.set_clickable(True)
 120                 self._unitValueColumn.connect("clicked", self._on_click_unit_column)
 121                 self._unitsView.append_column(self._unitValueColumn)
 122
 123                 self._unitSymbolColumn = gtk.TreeViewColumn(_('Units'), renderer)
 124                 self._unitSymbolColumn.set_property('resizable', 1)
 125                 self._unitSymbolColumn.add_attribute(renderer, 'text', 2)
 126                 self._unitSymbolColumn.set_clickable(True)
 127                 self._unitSymbolColumn.connect("clicked", self._on_click_unit_column)
 128                 self._unitsView.append_column(self._unitSymbolColumn)
 129
 130                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 131                 self._sortedUnitModel = gtk.TreeModelSort(self._unitModel)
 132                 columns = self._get_column_sort_stuff()
 133                 for columnIndex, (column, sortDirection, col_cmp) in enumerate(columns):
 134                         self._sortedUnitModel.set_sort_func(columnIndex, col_cmp)
 135                 self._unitsView.set_model(self._sortedUnitModel)
 136
 137                 #Insert a column into the category list even though the heading will not be seen
 138                 renderer = gtk.CellRendererText()
 139                 self._categoryColumn = gtk.TreeViewColumn('Title', renderer)
 140                 self._categoryColumn.set_property('resizable', 1)
 141                 self._categoryColumn.add_attribute(renderer, 'text', 0)
 142                 self._categoryView.append_column(self._categoryColumn)
 143
 144                 self._categoryModel = gtk.ListStore(gobject.TYPE_STRING)
 145                 self._categoryView.set_model(self._categoryModel)
 146                 #colourize each row differently for easier reading
 147                 self._categoryView.set_property('rules_hint', 1)
 148
 149                 #Populate the catagories list
 150                 for key in unit_data.UNIT_CATEGORIES:
 151                         iter = self._categoryModel.append()
 152                         self._categoryModel.set(iter, 0, key)
 153
 154                 #--------- connections to GUI ----------------
 155                 dic = {
 156                         "on_exit_menu_activate": self._on_user_exit,
 157                         "on_main_window_destroy": self._on_user_exit,
 158                         "on_categoryView_select_row": self._on_click_category,
 159                         "on_unitValue_changed": self._on_unit_value_changed,
 160                         "on_previousUnitValue_changed": self._on_previous_unit_value_changed,
 161                         "on_writeUnitsMenuItem_activate": self._on_user_write_units,
 162                         "on_findButton_clicked": self._on_find_activate,
 163                         "on_findEntry_activated": self._on_find_activate,
 164                         "on_findEntry_changed": self._on_findEntry_changed,
 165                         "on_aboutMenuItem_activate": self._on_about_clicked,
 166                         "on_messagebox_ok_clicked": self.messagebox_ok_clicked,
 167                         "on_clearSelectionMenuItem_activate": self._on_user_clear_selections,
 168                         "on_unitsView_cursor_changed": self._on_click_unit,
 169                         "on_shortlistcheck_toggled": self._on_shortlist_changed,
 170                         "on_toggleShortList_activate": self._on_edit_shortlist,
 171                 }
 172                 widgets.signal_autoconnect(dic)
 173                 self._mainWindow.connect("key-press-event", self._on_key_press)
 174                 self._mainWindow.connect("window-state-event", self._on_window_state_change)
 175
 176                 self._mainWindow.set_title('gonvert- %s - Unit Conversion Utility' % constants.__version__)
 177                 iconPath = pixmapspath + '/gonvert.png'
 178                 if os.path.exists(iconPath):
 179                         self._mainWindow.set_icon(gtk.gdk.pixbuf_new_from_file(iconPath))
 180                 else:
 181                         _moduleLogger.warn("Error: Could not find gonvert icon: %s" % iconPath)
 182
 183                 self._load_settings()
 184
 185         def _load_settings(self):
 186                 #Restore window size from previously saved settings if it exists and is valid.
 187                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 188                 if os.path.exists(windowDatPath):
 189                         #Retrieving previous window settings from ~/.gonvert/window.dat
 190                         saved_window = pickle.load(open(windowDatPath, "r"))
 191                         #If the 'size' has been stored, then extract size from saved_window.
 192                         if 'size' in saved_window:
 193                                 a, b = saved_window['size']
 194                                 self._mainWindow.resize(a, b)
 195                         else:
 196                                 #Maximize if no previous size was found
 197                                 #self._mainWindow.maximize()
 198                                 pass
 199                 else:
 200                         #Maximize if no previous window.dat file was found
 201                         #self._mainWindow.maximize()
 202                         pass
 203
 204                 #Restore selections from previously saved settings if it exists and is valid.
 205                 historical_catergory_found = False
 206                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 207                 if os.path.exists(selectionsDatPath):
 208                         #Retrieving previous selections from ~/.gonvert/selections.dat
 209                         selections = pickle.load(open(selectionsDatPath, 'r'))
 210                         #Restoring previous selections.
 211                         #If the 'selected_unts' has been stored, then extract self._defaultUnitForCategory from selections.
 212                         if 'selected_units' in selections:
 213                                 self._defaultUnitForCategory = selections['selected_units']
 214                         #Make sure that the 'self._selectedCategory' has been stored.
 215                         if 'selected_category' in selections:
 216                                 #Match an available category to the previously selected category.
 217                                 for counter in range(len(unit_data.UNIT_CATEGORIES)):
 218                                         if selections['selected_category'] == unit_data.UNIT_CATEGORIES[counter]:
 219                                                 # Restore the previously selected category.
 220                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
 221                                                 self._categoryView.grab_focus()
 222                                 historical_catergory_found = True
 223
 224                 if not historical_catergory_found:
 225                         print "Couldn't find saved category, using default."
 226                         #If historical records were not kept then default to
 227                         # put the focus on the first category
 228                         self._categoryView.set_cursor(0, self._categoryColumn, False)
 229                         self._categoryView.grab_focus()
 230
 231                 self._select_default_unit()
 232
 233         def _save_settings(self):
 234                 """
 235                 This routine saves the selections to a file, and
 236                 should therefore only be called when exiting the program.
 237
 238                 Update selections dictionary which consists of the following keys:
 239                 'self._selectedCategory': full name of selected category
 240                 'self._defaultUnitForCategory': self._defaultUnitForCategory dictionary which contains:
 241                 [categoryname: #1 displayed unit, #2 displayed unit]
 242                 """
 243                 #Determine the contents of the selected category row
 244                 selected, iter = self._categoryView.get_selection().get_selected()
 245                 self._selectedCategory = self._categoryModel.get_value(iter, 0)
 246
 247                 selections = {
 248                         'selected_category': self._selectedCategory,
 249                         'selected_units': self._defaultUnitForCategory
 250                 }
 251                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 252                 pickle.dump(selections, open(selectionsDatPath, 'w'))
 253
 254                 #Get last size of app and save it
 255                 window_settings = {
 256                         'size': self._mainWindow.get_size()
 257                 }
 258                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 259                 pickle.dump(window_settings, open(windowDatPath, 'w'))
 260
 261         def _clear_find(self):
 262                 # switch to "new find" state
 263                 self._find_result = []
 264                 self._findIndex = 0
 265
 266                 # Clear our user message
 267                 self._findLabel.set_text('')
 268
 269         def _find_first(self):
 270                 assert len(self._find_result) == 0
 271                 assert self._findIndex == 0
 272                 findString = string.lower(string.strip(self._findEntry.get_text()))
 273                 if not findString:
 274                         return
 275
 276                 # Gather info on all the matching units from all categories
 277                 for catIndex, category in enumerate(unit_data.UNIT_CATEGORIES):
 278                         units = unit_data.get_units(category)
 279                         for unitIndex, unit in enumerate(units):
 280                                 loweredUnit = unit.lower()
 281                                 if loweredUnit in findString or findString in loweredUnit:
 282                                         self._find_result.append((category, unit, catIndex, unitIndex))
 283
 284         def _update_find_selection(self):
 285                 assert 0 < len(self._find_result)
 286
 287                 #check if next find is in a new category (prevent category changes when unnecessary
 288                 if self._selectedCategory != self._find_result[self._findIndex][0]:
 289                         self._categoryView.set_cursor(
 290                                 self._find_result[self._findIndex][2], self._categoryColumn, False
 291                         )
 292
 293                 self._unitsView.set_cursor(
 294                         self._find_result[self._findIndex][3], self._unitNameColumn, True
 295                 )
 296
 297         def _find_next(self):
 298                 """
 299                 check if 'new find' or 'last find' or 'next-find'
 300
 301                 new-find = run the find algorithm which also selects the first found unit
 302                          = self._findIndex = 0 and self._find_result = []
 303
 304                 last-find = restart from top again
 305                           = self._findIndex = len(self._find_result)
 306
 307                 next-find = continue to next found location
 308                            = self._findIndex = 0 and len(self._find_result)>0
 309                 """
 310                 if len(self._find_result) == 0:
 311                         self._find_first()
 312                 else:
 313                         if self._findIndex == len(self._find_result)-1:
 314                                 self._findIndex = 0
 315                         else:
 316                                 self._findIndex += 1
 317
 318                 if not self._find_result:
 319                         self._findLabel.set_text('Text not found')
 320                 else:
 321                         self._update_find_selection()
 322                         resultsLeft = len(self._find_result) - self._findIndex - 1
 323                         self._findLabel.set_text(
 324                                 '%s result(s) left' % (resultsLeft, )
 325                         )
 326
 327         def _find_previous(self):
 328                 """
 329                 check if 'new find' or 'last find' or 'next-find'
 330
 331                 new-find = run the find algorithm which also selects the first found unit
 332                          = self._findIndex = 0 and self._find_result = []
 333
 334                 last-find = restart from top again
 335                           = self._findIndex = len(self._find_result)
 336
 337                 next-find = continue to next found location
 338                            = self._findIndex = 0 and len(self._find_result)>0
 339                 """
 340                 if len(self._find_result) == 0:
 341                         self._find_first()
 342                 else:
 343                         if self._findIndex == 0:
 344                                 self._findIndex = len(self._find_result)-1
 345                         else:
 346                                 self._findIndex -= 1
 347
 348                 if not self._find_result:
 349                         self._findLabel.set_text('Text not found')
 350                 else:
 351                         self._update_find_selection()
 352                         resultsLeft = len(self._find_result) - self._findIndex - 1
 353                         self._findLabel.set_text(
 354                                 '%s result(s) left' % (resultsLeft, )
 355                         )
 356
 357         def _toggle_find(self):
 358                 if self._searchLayout.get_property("visible"):
 359                         self._searchLayout.hide()
 360                 else:
 361                         self._searchLayout.show()
 362
 363         def _unit_model_cmp(self, sortedModel, leftItr, rightItr):
 364                 leftUnitText = self._unitModel.get_value(leftItr, 0)
 365                 rightUnitText = self._unitModel.get_value(rightItr, 0)
 366                 return cmp(leftUnitText, rightUnitText)
 367
 368         def _symbol_model_cmp(self, sortedModel, leftItr, rightItr):
 369                 leftSymbolText = self._unitModel.get_value(leftItr, 2)
 370                 rightSymbolText = self._unitModel.get_value(rightItr, 2)
 371                 return cmp(leftSymbolText, rightSymbolText)
 372
 373         def _value_model_cmp(self, sortedModel, leftItr, rightItr):
 374                 #special sorting exceptions for ascii values (instead of float values)
 375                 if self._selectedCategory == "Computer Numbers":
 376                         leftValue = self._unitModel.get_value(leftItr, 1)
 377                         rightValue = self._unitModel.get_value(rightItr, 1)
 378                 else:
 379                         leftValueText = self._unitModel.get_value(leftItr, 1)
 380                         leftValue = float(leftValueText) if leftValueText else 0.0
 381
 382                         rightValueText = self._unitModel.get_value(rightItr, 1)
 383                         rightValue = float(rightValueText) if rightValueText else 0.0
 384                 return cmp(leftValue, rightValue)
 385
 386         def _get_column_sort_stuff(self):
 387                 columns = (
 388                         (self._unitNameColumn, "_unit_sort_direction", self._unit_model_cmp),
 389                         (self._unitValueColumn, "_value_sort_direction", self._value_model_cmp),
 390                         (self._unitSymbolColumn, "_units_sort_direction", self._symbol_model_cmp),
 391                 )
 392                 return columns
 393
 394         def _switch_category(self, category):
 395                 self._selectedCategory = category
 396                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[self._selectedCategory]
 397
 398                 #Fill up the units descriptions and clear the value cells
 399                 self._clear_visible_unit_data()
 400                 for key in unit_data.get_units(self._selectedCategory):
 401                         iter = self._unitModel.append()
 402                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
 403                 self._sortedUnitModel.sort_column_changed()
 404
 405                 self._select_default_unit()
 406
 407         def _clear_visible_unit_data(self):
 408                 self._unitDescription.get_buffer().set_text("")
 409                 self._unitName.set_text('')
 410                 self._unitValue.set_text('')
 411                 self._unitSymbol.set_text('')
 412
 413                 self._previousUnitName.set_text('')
 414                 self._previousUnitValue.set_text('')
 415                 self._previousUnitSymbol.set_text('')
 416
 417                 self._unitModel.clear()
 418
 419         def _select_default_unit(self):
 420                 # Restore the previous historical settings of previously selected units
 421                 # in this newly selected category
 422                 if self._selectedCategory in self._defaultUnitForCategory:
 423                         units = unit_data.get_units(self._selectedCategory)
 424
 425                         #Restore oldest selection first.
 426                         if self._defaultUnitForCategory[self._selectedCategory][1]:
 427                                 unitIndex = units.index(self._defaultUnitForCategory[self._selectedCategory][1])
 428                                 self._unitsView.set_cursor(unitIndex, self._unitNameColumn, True)
 429
 430                         #Restore newest selection second.
 431                         if self._defaultUnitForCategory[self._selectedCategory][0]:
 432                                 unitIndex = units.index(self._defaultUnitForCategory[self._selectedCategory][0])
 433                                 self._unitsView.set_cursor(unitIndex, self._unitNameColumn, True)
 434
 435                 # select the text so user can start typing right away
 436                 self._unitValue.grab_focus()
 437                 self._unitValue.select_region(0, -1)
 438
 439         def _on_shortlist_changed(self, *args):
 440                 try:
 441                         raise NotImplementedError("%s" % self._shortlistcheck.get_active())
 442                 except Exception:
 443                         _moduleLogger.exception("")
 444
 445         def _on_edit_shortlist(self, *args):
 446                 try:
 447                         raise NotImplementedError("%s" % self._toggleShortList.get_active())
 448                 except Exception:
 449                         _moduleLogger.exception("")
 450
 451         def _on_user_clear_selections(self, *args):
 452                 try:
 453                         selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 454                         os.remove(selectionsDatPath)
 455                         self._defaultUnitForCategory = {}
 456                 except Exception:
 457                         _moduleLogger.exception("")
 458
 459         def _on_key_press(self, widget, event, *args):
 460                 """
 461                 @note Hildon specific
 462                 """
 463                 RETURN_TYPES = (gtk.keysyms.Return, gtk.keysyms.ISO_Enter, gtk.keysyms.KP_Enter)
 464                 try:
 465                         if (
 466                                 event.keyval == gtk.keysyms.F6 or
 467                                 event.keyval in RETURN_TYPES and event.get_state() & gtk.gdk.CONTROL_MASK
 468                         ):
 469                                 if self._isFullScreen:
 470                                         self._mainWindow.unfullscreen()
 471                                 else:
 472                                         self._mainWindow.fullscreen()
 473                         elif event.keyval == gtk.keysyms.f and event.get_state() & gtk.gdk.CONTROL_MASK:
 474                                 self._toggle_find()
 475                         elif event.keyval == gtk.keysyms.p and event.get_state() & gtk.gdk.CONTROL_MASK:
 476                                 self._find_previous()
 477                         elif event.keyval == gtk.keysyms.n and event.get_state() & gtk.gdk.CONTROL_MASK:
 478                                 self._find_next()
 479                 except Exception, e:
 480                         _moduleLogger.exception("")
 481
 482         def _on_window_state_change(self, widget, event, *args):
 483                 """
 484                 @note Hildon specific
 485                 """
 486                 try:
 487                         if event.new_window_state & gtk.gdk.WINDOW_STATE_FULLSCREEN:
 488                                 self._isFullScreen = True
 489                         else:
 490                                 self._isFullScreen = False
 491                 except Exception, e:
 492                         _moduleLogger.exception("")
 493
 494         def _on_findEntry_changed(self, *args):
 495                 """
 496                 Clear out find results since the user wants to look for something new
 497                 """
 498                 try:
 499                         self._clear_find()
 500                 except Exception:
 501                         _moduleLogger.exception("")
 502
 503         def _on_find_activate(self, a):
 504                 try:
 505                         self._find_next()
 506                         self._findButton.grab_focus()
 507                 except Exception:
 508                         _moduleLogger.exception("")
 509
 510         def _on_click_unit_column(self, col):
 511                 """
 512                 Sort the contents of the col when the user clicks on the title.
 513                 """
 514                 try:
 515                         #Determine which column requires sorting
 516                         columns = self._get_column_sort_stuff()
 517                         for columnIndex, (maybeCol, directionName, col_cmp) in enumerate(columns):
 518                                 if col is maybeCol:
 519                                         direction = getattr(self, directionName)
 520                                         gtkDirection = gtk.SORT_ASCENDING if direction else gtk.SORT_DESCENDING
 521
 522                                         # cause a sort
 523                                         self._sortedUnitModel.set_sort_column_id(columnIndex, gtkDirection)
 524
 525                                         # set the visual for sorting
 526                                         col.set_sort_indicator(True)
 527                                         col.set_sort_order(not direction)
 528
 529                                         setattr(self, directionName, not direction)
 530                                         break
 531                                 else:
 532                                         maybeCol.set_sort_indicator(False)
 533                         else:
 534                                 assert False, "Unknown column: %s" % (col.get_title(), )
 535                 except Exception:
 536                         _moduleLogger.exception("")
 537
 538         def _on_click_category(self, *args):
 539                 try:
 540                         selected, iter = self._categoryView.get_selection().get_selected()
 541                         selectedCategory = self._categoryModel.get_value(iter, 0)
 542                         self._switch_category(selectedCategory)
 543                 except Exception:
 544                         _moduleLogger.exception("")
 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._selectedCategory == "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._selectedCategory in self._defaultUnitForCategory:
 584                         if self._defaultUnitForCategory[self._selectedCategory][0]:
 585                                 self._defaultUnitForCategory[self._selectedCategory] = [selected_unit, self._defaultUnitForCategory[self._selectedCategory][0]]
 586                 else:
 587                         self._defaultUnitForCategory[self._selectedCategory] = [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 _on_unit_value_changed(self, a):
 596                 if self._calcsuppress:
 597                         #self._calcsuppress = False
 598                         return
 599                 # determine if value to be calculated is empty
 600                 if self._selectedCategory == "Computer Numbers":
 601                         if self._unitValue.get_text() == '':
 602                                 value = '0'
 603                         else:
 604                                 value = self._unitValue.get_text()
 605                 else:
 606                         if self._unitValue.get_text() == '':
 607                                 value = 0.0
 608                         else:
 609                                 value = float(self._unitValue.get_text())
 610
 611                 if self._unitName.get_text() != '':
 612                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 613                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 614
 615                         keys = self._unitDataInCategory.keys()
 616                         keys.sort()
 617                         del keys[0]
 618                         row = 0
 619
 620                         #point to the first row
 621                         iter = self._unitModel.get_iter_first()
 622
 623                         while iter:
 624                                 #get the formula from the name at the row
 625                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 626
 627                                 #set the result in the value column
 628                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 629
 630                                 #point to the next row in the self._unitModel
 631                                 iter = self._unitModel.iter_next(iter)
 632
 633                         # if the second row has a unit then update its value
 634                         if self._previousUnitName.get_text() != '':
 635                                 self._calcsuppress = True
 636                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 637                                 self._previousUnitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 638                                 self._calcsuppress = False
 639
 640         def _on_previous_unit_value_changed(self, a):
 641                 if self._calcsuppress == True:
 642                         #self._calcsuppress = False
 643                         return
 644                 # determine if value to be calculated is empty
 645                 if self._selectedCategory == "Computer Numbers":
 646                         if self._previousUnitValue.get_text() == '':
 647                                 value = '0'
 648                         else:
 649                                 value = self._previousUnitValue.get_text()
 650                 else:
 651                         if self._previousUnitValue.get_text() == '':
 652                                 value = 0.0
 653                         else:
 654                                 value = float(self._previousUnitValue.get_text())
 655
 656                 if self._previousUnitName.get_text() != '':
 657                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 658                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 659
 660                         keys = self._unitDataInCategory.keys()
 661                         keys.sort()
 662                         del keys[0]
 663                         row = 0
 664
 665                         #point to the first row
 666                         iter = self._unitModel.get_iter_first()
 667
 668                         while iter:
 669                                 #get the formula from the name at the row
 670                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 671
 672                                 #set the result in the value column
 673                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 674
 675                                 #point to the next row in the self._unitModel
 676                                 iter = self._unitModel.iter_next(iter)
 677
 678                         # if the second row has a unit then update its value
 679                         if self._unitName.get_text() != '':
 680                                 self._calcsuppress = True
 681                                 func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 682                                 self._unitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 683                                 self._calcsuppress = False
 684
 685         def messagebox_ok_clicked(self, a):
 686                 messagebox.hide()
 687
 688         def _on_user_write_units(self, a):
 689                 ''"Write the list of categories and units to stdout for documentation purposes.''"
 690                 messagebox_model = gtk.TextBuffer(None)
 691                 messageboxtext.set_buffer(messagebox_model)
 692                 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)
 693                 messagebox.show()
 694                 while gtk.events_pending():
 695                         gtk.mainiteration(False)
 696
 697                 total_categories = 0
 698                 total_units = 0
 699                 print 'gonvert-%s%s' % (
 700                         constants.__version__,
 701                         _(u' - Unit Conversion Utility  - Convertible units listing: ')
 702                 )
 703                 for category_key in unit_data.UNIT_CATEGORIES:
 704                         total_categories = total_categories + 1
 705                         print category_key, ": "
 706                         self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[category_key]
 707                         unit_keys = self._unitDataInCategory.keys()
 708                         unit_keys.sort()
 709                         del unit_keys[0] # do not display .base_unit description key
 710                         for unit_key in unit_keys:
 711                                 total_units = total_units + 1
 712                                 print "\t", unit_key
 713                 print total_categories, ' categories'
 714                 print total_units, ' units'
 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()