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 sys
   8 import gettext
   9 import logging
  10
  11 import gobject
  12 import gtk
  13 import gtk.glade
  14 import gtk.gdk
  15
  16 import constants
  17 import unit_data
  18
  19
  20 _moduleLogger = logging.getLogger("gonvert_glade")
  21
  22 gettext.bindtextdomain('gonvert', '/usr/share/locale')
  23 gettext.textdomain('gonvert')
  24 _ = gettext.gettext
  25
  26
  27 def change_menu_label(widgets, labelname, newtext):
  28         item_label = widgets.get_widget(labelname).get_children()[0]
  29         item_label.set_text(newtext)
  30
  31
  32 class Gonvert(object):
  33
  34         _glade_files = [
  35                 os.path.join(os.path.dirname(__file__), "gonvert.glade"),
  36                 os.path.join(os.path.dirname(__file__), "../data/gonvert.glade"),
  37                 os.path.join(os.path.dirname(__file__), "../lib/gonvert.glade"),
  38                 '/usr/lib/gonvert/gonvert.glade',
  39         ]
  40
  41         def __init__(self):
  42                 self._unitDataInCategory = None
  43                 self._calcsuppress = False
  44                 self._unit_sort_direction = False
  45                 self._value_sort_direction = False
  46                 self._units_sort_direction = False
  47
  48                 self._find_result = [] # empty find result list
  49                 self._find_count = 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_selection = self._unitsView.get_selection()
  83
  84                 self._unitName = widgets.get_widget('unitName')
  85                 self._unitValue = widgets.get_widget('unitValue')
  86                 self._previousUnitName = widgets.get_widget('previousUnitName')
  87                 self._previousUnitValue = widgets.get_widget('previousUnitValue')
  88                 messagebox = widgets.get_widget('msgbox')
  89                 messageboxtext = widgets.get_widget('msgboxtext')
  90
  91                 self._unitSymbol = widgets.get_widget('unitSymbol')
  92                 self._previousUnitSymbol = widgets.get_widget('previousUnitSymbol')
  93
  94                 self._unitDescription = widgets.get_widget('unitDescription')
  95
  96                 self._findEntry = widgets.get_widget('findEntry')
  97                 self._findLabel = widgets.get_widget('findLabel')
  98                 findButton = widgets.get_widget('findButton')
  99                 ToolTips = gtk.Tooltips()
 100                 ToolTips.set_tip(findButton, _(u'Find unit (F6)'))
 101
 102                 #insert a self._categoryColumnumn into the units list even though the heading will not be seen
 103                 renderer = gtk.CellRendererText()
 104                 self._unitNameColumn = gtk.TreeViewColumn(_('Unit Name'), renderer)
 105                 self._unitNameColumn.set_property('resizable', 1)
 106                 self._unitNameColumn.add_attribute(renderer, 'text', 0)
 107                 self._unitNameColumn.set_clickable(True)
 108                 self._unitNameColumn.connect("clicked", self._on_click_unit_column)
 109                 self._unitsView.append_column(self._unitNameColumn)
 110
 111                 self._unitValueColumn = gtk.TreeViewColumn(_('Value'), renderer)
 112                 self._unitValueColumn.set_property('resizable', 1)
 113                 self._unitValueColumn.add_attribute(renderer, 'text', 1)
 114                 self._unitValueColumn.set_clickable(True)
 115                 self._unitValueColumn.connect("clicked", self._on_click_unit_column)
 116                 self._unitsView.append_column(self._unitValueColumn)
 117
 118                 self._unitSymbolColumn = gtk.TreeViewColumn(_('Units'), renderer)
 119                 self._unitSymbolColumn.set_property('resizable', 1)
 120                 self._unitSymbolColumn.add_attribute(renderer, 'text', 2)
 121                 self._unitSymbolColumn.set_clickable(True)
 122                 self._unitSymbolColumn.connect("clicked", self._on_click_unit_column)
 123                 self._unitsView.append_column(self._unitSymbolColumn)
 124
 125                 #Insert a column into the category list even though the heading will not be seen
 126                 renderer = gtk.CellRendererText()
 127                 self._categoryColumn = gtk.TreeViewColumn('Title', renderer)
 128                 self._categoryColumn.set_property('resizable', 1)
 129                 self._categoryColumn.add_attribute(renderer, 'text', 0)
 130                 self._categoryView.append_column(self._categoryColumn)
 131
 132                 self._categoryModel = gtk.ListStore(gobject.TYPE_STRING)
 133                 self._categoryView.set_model(self._categoryModel)
 134                 #colourize each row differently for easier reading
 135                 self._categoryView.set_property('rules_hint', 1)
 136
 137                 #Populate the catagories list
 138                 for key in unit_data.UNIT_CATEGORIES:
 139                         iter = self._categoryModel.append()
 140                         self._categoryModel.set(iter, 0, key)
 141
 142                 #--------- connections to GUI ----------------
 143                 dic = {
 144                         "on_exit_menu_activate": self._on_user_exit,
 145                         "on_main_window_destroy": self._on_user_exit,
 146                         "on_categoryView_select_row": self._on_click_category,
 147                         "on_unitsView__on_click_unit_column": self._on_click_unit_column,
 148                         "on_unitValue_changed": self._on_unit_value_changed,
 149                         "on_previousUnitValue_changed": self._on_previous_unit_value_changed,
 150                         "on_writeUnitsMenuItem_activate": self._on_user_write_units,
 151                         "on_findButton_clicked": self._on_find_activate,
 152                         "on_findEntry_activated": self._on_find_activate,
 153                         "on_findEntry_changed": self._on_findEntry_changed,
 154                         "on_aboutMenuItem_activate": self._on_about_clicked,
 155                         "on_messagebox_ok_clicked": self.messagebox_ok_clicked,
 156                         "on_clearSelectionMenuItem_activate": self._on_user_clear_selections,
 157                         "on_unitsView_cursor_changed": self._on_click_unit,
 158                         "on_unitsView_button_released": self._on_button_released,
 159                         "on_shortlistcheck_toggled": self._on_shortlist_changed,
 160                         "on_toggleShortList_activate": self._on_edit_shortlist,
 161                 }
 162                 widgets.signal_autoconnect(dic)
 163
 164                 self._mainWindow.set_title('gonvert- %s - Unit Conversion Utility' % constants.__version__)
 165                 iconPath = pixmapspath + '/gonvert.png'
 166                 if os.path.exists(iconPath):
 167                         self._mainWindow.set_icon(gtk.gdk.pixbuf_new_from_file(iconPath))
 168                 else:
 169                         _moduleLogger.warn("Error: Could not find gonvert icon: %s" % iconPath)
 170
 171                 self._load_settings()
 172
 173         def _load_settings(self):
 174                 #Restore window size from previously saved settings if it exists and is valid.
 175                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 176                 if os.path.exists(windowDatPath):
 177                         #Retrieving previous window settings from ~/.gonvert/window.dat
 178                         saved_window = pickle.load(open(windowDatPath, "r"))
 179                         #If the 'size' has been stored, then extract size from saved_window.
 180                         if 'size' in saved_window:
 181                                 a, b = saved_window['size']
 182                                 self._mainWindow.resize(a, b)
 183                         else:
 184                                 #Maximize if no previous size was found
 185                                 #self._mainWindow.maximize()
 186                                 pass
 187                 else:
 188                         #Maximize if no previous window.dat file was found
 189                         #self._mainWindow.maximize()
 190                         pass
 191
 192                 #Restore selections from previously saved settings if it exists and is valid.
 193                 historical_catergory_found = False
 194                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 195                 if os.path.exists(selectionsDatPath):
 196                         #Retrieving previous selections from ~/.gonvert/selections.dat
 197                         selections = pickle.load(open(selectionsDatPath, 'r'))
 198                         #Restoring previous selections.
 199                         #If the 'selected_unts' has been stored, then extract self._selected_units from selections.
 200                         if 'selected_units' in selections:
 201                                 self._selected_units = selections['selected_units']
 202                         #Make sure that the 'self._selected_category' has been stored.
 203                         if 'selected_category' in selections:
 204                                 #Match an available category to the previously selected category.
 205                                 for counter in range(len(unit_data.UNIT_CATEGORIES)):
 206                                         if selections['selected_category'] == unit_data.UNIT_CATEGORIES[counter]:
 207                                                 # Restore the previously selected category.
 208                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
 209                                                 self._categoryView.grab_focus()
 210                                 historical_catergory_found = True
 211
 212                 if not historical_catergory_found:
 213                         print "Couldn't find saved category, using default."
 214                         #If historical records were not kept then default to
 215                         # put the focus on the first category
 216                         self._categoryView.set_cursor(0, self._categoryColumn, False)
 217                         self._categoryView.grab_focus()
 218
 219                 self.restore_units()
 220
 221         def _save_settings(self):
 222                 """
 223                 This routine saves the selections to a file, and
 224                 should therefore only be called when exiting the program.
 225
 226                 Update selections dictionary which consists of the following keys:
 227                 'self._selected_category': full name of selected category
 228                 'self._selected_units': self._selected_units dictionary which contains:
 229                 [categoryname: #1 displayed unit, #2 displayed unit]
 230                 """
 231                 #Determine the contents of the selected category row
 232                 selected, iter = self._categoryView.get_selection().get_selected()
 233                 self._selected_category = self._categoryModel.get_value(iter, 0)
 234
 235                 selections = {
 236                         'selected_category': self._selected_category,
 237                         'selected_units': self._selected_units
 238                 }
 239                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 240                 pickle.dump(selections, open(selectionsDatPath, 'w'))
 241
 242                 #Get last size of app and save it
 243                 window_settings = {
 244                         'size': self._mainWindow.get_size()
 245                 }
 246                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 247                 pickle.dump(window_settings, open(windowDatPath, 'w'))
 248
 249         def _clear_find(self):
 250                 # switch to "new find" state
 251                 self._find_result = []
 252                 self._find_count = 0
 253
 254                 # Clear our user message
 255                 self._findLabel.set_text('')
 256
 257         def _find_first(self):
 258                 assert len(self._find_result) == 0
 259                 assert self._find_count == 0
 260                 findString = string.lower(string.strip(self._findEntry.get_text()))
 261                 if not findString:
 262                         return
 263
 264                 # Gather info on all the matching units from all categories
 265                 for catIndex, category in enumerate(unit_data.UNIT_CATEGORIES):
 266                         units = unit_data.get_units(category)
 267                         for unitIndex, unit in enumerate(units):
 268                                 loweredUnit = unit.lower()
 269                                 if loweredUnit in findString or findString in loweredUnit:
 270                                         self._find_result.append((category, unit, catIndex, unitIndex))
 271
 272                 if not self._find_result:
 273                         return
 274
 275                 self._select_found_unit()
 276
 277         def _find_wrap_around(self):
 278                 assert 0 < len(self._find_result)
 279                 assert self._find_count + 1 == len(self._find_result)
 280                 #select first result
 281                 self._find_count = 0
 282                 self._select_found_unit()
 283
 284         def _find_next(self):
 285                 assert 0 < len(self._find_result)
 286                 assert self._find_count + 1 < len(self._find_result)
 287                 self._find_count += 1
 288                 self._select_found_unit()
 289
 290         def _select_found_unit(self):
 291                 assert 0 < len(self._find_result)
 292
 293                 #check if next find is in a new category (prevent category changes when unnecessary
 294                 if self._selected_category != self._find_result[self._find_count][0]:
 295                         self._categoryView.set_cursor(
 296                                 self._find_result[self._find_count][2], self._categoryColumn, False
 297                         )
 298
 299                 self._unitsView.set_cursor(
 300                         self._find_result[self._find_count][3], self._unitNameColumn, True
 301                 )
 302
 303         def _on_findEntry_changed(self, *args):
 304                 """
 305                 Clear out find results since the user wants to look for something new
 306                 """
 307                 try:
 308                         self._clear_find()
 309                 except Exception:
 310                         _moduleLogger.exception()
 311
 312         def _on_shortlist_changed(self, *args):
 313                 try:
 314                         raise NotImplementedError("%s" % self._shortlistcheck.get_active())
 315                 except Exception:
 316                         _moduleLogger.exception()
 317
 318         def _on_edit_shortlist(self, *args):
 319                 try:
 320                         raise NotImplementedError("%s" % self._toggleShortList.get_active())
 321                 except Exception:
 322                         _moduleLogger.exception()
 323
 324         def _on_user_clear_selections(self, *args):
 325                 try:
 326                         selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 327                         os.remove(selectionsDatPath)
 328                         self._selected_units = {}
 329                 except Exception:
 330                         _moduleLogger.exception()
 331
 332         def _on_find_activate(self, a):
 333                 """
 334                 check if 'new find' or 'last find' or 'next-find'
 335
 336                 new-find = run the find algorithm which also selects the first found unit
 337                          = self._find_count = 0 and self._find_result = []
 338
 339                 last-find = restart from top again
 340                           = self._find_count = len(self._find_result)
 341
 342                 next-find = continue to next found location
 343                            = self._find_count = 0 and len(self._find_result)>0
 344                 """
 345                 try:
 346                         if len(self._find_result) == 0:
 347                                 self._find_first()
 348                         else:
 349                                 if self._find_count == len(self._find_result)-1:
 350                                         self._find_wrap_around()
 351                                 else:
 352                                         self._find_next()
 353
 354                         if not self._find_result:
 355                                 self._findLabel.set_text('Text not found')
 356                         else:
 357                                 resultsLeft = len(self._find_result) - self._find_count - 1
 358                                 self._findLabel.set_text(
 359                                         '%s result(s) left' % (resultsLeft, )
 360                                 )
 361                 except Exception:
 362                         _moduleLogger.exception()
 363
 364         def _on_click_unit_column(self, col):
 365                 """
 366                 Sort the contents of the col when the user clicks on the title.
 367                 """
 368                 #Determine which column requires sorting
 369                 if col is self._unitNameColumn:
 370                         selectedUnitColumn = 0
 371                         self._unitNameColumn.set_sort_indicator(True)
 372                         self._unitValueColumn.set_sort_indicator(False)
 373                         self._unitSymbolColumn.set_sort_indicator(False)
 374                         self._unitNameColumn.set_sort_order(not self._unit_sort_direction)
 375                 elif col is self._unitValueColumn:
 376                         selectedUnitColumn = 1
 377                         self._unitNameColumn.set_sort_indicator(False)
 378                         self._unitValueColumn.set_sort_indicator(True)
 379                         self._unitSymbolColumn.set_sort_indicator(False)
 380                         self._unitValueColumn.set_sort_order(not self._value_sort_direction)
 381                 elif col is self._unitSymbolColumn:
 382                         selectedUnitColumn = 2
 383                         self._unitNameColumn.set_sort_indicator(False)
 384                         self._unitValueColumn.set_sort_indicator(False)
 385                         self._unitSymbolColumn.set_sort_indicator(True)
 386                         self._unitSymbolColumn.set_sort_order(not self._units_sort_direction)
 387                 else:
 388                         assert False, "Unknown column: %s" % (col.get_title(), )
 389
 390                 #declare a spot to hold the sorted list
 391                 sorted_list = []
 392
 393                 #point to the first row
 394                 iter = self._unitModel.get_iter_first()
 395                 row = 0
 396
 397                 while iter:
 398                         #grab all text from columns for sorting
 399
 400                         #get the text from each column
 401                         unit_text = self._unitModel.get_value(iter, 0)
 402                         units_text = self._unitModel.get_value(iter, 2)
 403
 404                         #do not bother sorting if the value column is empty
 405                         if self._unitModel.get_value(iter, 1) == '' and selectedUnitColumn == 1:
 406                                 return
 407
 408                         #special sorting exceptions for ascii values (instead of float values)
 409                         if self._selected_category == "Computer Numbers":
 410                                 value_text = self._unitModel.get_value(iter, 1)
 411                         else:
 412                                 if self._unitModel.get_value(iter, 1) == None or self._unitModel.get_value(iter, 1) == '':
 413                                         value_text = ''
 414                                 else:
 415                                         value_text = float(self._unitModel.get_value(iter, 1))
 416
 417                         if selectedUnitColumn == 0:
 418                                 sorted_list.append((unit_text, value_text, units_text))
 419                         elif selectedUnitColumn == 1:
 420                                 sorted_list.append((value_text, unit_text, units_text))
 421                         else:
 422                                 sorted_list.append((units_text, value_text, unit_text))
 423
 424                         #point to the next row in the self._unitModel
 425                         iter = self._unitModel.iter_next(iter)
 426                         row = row+1
 427
 428                 #check if no calculations have been made yet (don't bother sorting)
 429                 if row == 0:
 430                         return
 431                 else:
 432                         if selectedUnitColumn == 0:
 433                                 if not self._unit_sort_direction:
 434                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(x), string.lower(y)))
 435                                         self._unit_sort_direction = True
 436                                 else:
 437                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(y), string.lower(x)))
 438                                         self._unit_sort_direction = False
 439                         elif selectedUnitColumn == 1:
 440                                 sorted_list.sort()
 441                                 if not self._value_sort_direction:
 442                                         self._value_sort_direction = True
 443                                 else:
 444                                         sorted_list.reverse()
 445                                         self._value_sort_direction = False
 446                         else:
 447                                 if not self._units_sort_direction:
 448                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(x), string.lower(y)))
 449                                         self._units_sort_direction = True
 450                                 else:
 451                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(y), string.lower(x)))
 452                                         self._units_sort_direction = False
 453
 454                         #Clear out the previous list of units
 455                         self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 456                         self._unitsView.set_model(self._unitModel)
 457
 458                         #colourize each row differently for easier reading
 459                         self._unitsView.set_property('rules_hint', 1)
 460
 461                         #Clear out the description
 462                         text_model = gtk.TextBuffer(None)
 463                         self._unitDescription.set_buffer(text_model)
 464
 465                         if selectedUnitColumn == 0:
 466                                 for unit, value, units in sorted_list:
 467                                         iter = self._unitModel.append()
 468                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
 469                         elif selectedUnitColumn == 1:
 470                                 for value, unit, units in sorted_list:
 471                                         iter = self._unitModel.append()
 472                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
 473                         else:
 474                                 for units, value, unit in sorted_list:
 475                                         iter = self._unitModel.append()
 476                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
 477                 return
 478
 479         def _on_click_category(self, row):
 480                 #Clear out the previous list of units
 481                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 482                 self._unitsView.set_model(self._unitModel)
 483
 484                 #Colourize each row alternately for easier reading
 485                 self._unitsView.set_property('rules_hint', 1)
 486
 487                 #Clear out the description
 488                 text_model = gtk.TextBuffer(None)
 489                 self._unitDescription.set_buffer(text_model)
 490
 491                 #Determine the contents of the selected category row
 492                 selected, iter = row.get_selection().get_selected()
 493
 494                 self._selected_category = self._categoryModel.get_value(iter, 0)
 495
 496                 self._unit_sort_direction = False
 497                 self._value_sort_direction = False
 498                 self._units_sort_direction = False
 499                 self._unitNameColumn.set_sort_indicator(False)
 500                 self._unitValueColumn.set_sort_indicator(False)
 501                 self._unitSymbolColumn.set_sort_indicator(False)
 502
 503                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[selected.get_value(iter, 0)]
 504                 keys = self._unitDataInCategory.keys()
 505                 keys.sort()
 506                 del keys[0] # do not display .base_unit description key
 507
 508                 #Fill up the units descriptions and clear the value cells
 509                 for key in keys:
 510                         iter = self._unitModel.append()
 511                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
 512
 513                 self._unitName.set_text('')
 514                 self._unitValue.set_text('')
 515                 self._previousUnitName.set_text('')
 516                 self._previousUnitValue.set_text('')
 517                 self._unitSymbol.set_text('')
 518                 self._previousUnitSymbol.set_text('')
 519
 520                 self.restore_units()
 521
 522         def restore_units(self):
 523                 # Restore the previous historical settings of previously selected units in this newly selected category
 524                 #Since category has just been clicked, the list will be sorted already.
 525                 if self._selected_category in self._selected_units:
 526                         if self._selected_units[self._selected_category][0]:
 527                                 #self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
 528
 529                                 units = unit_data.UNIT_DESCRIPTIONS[self._selected_category].keys()
 530                                 units.sort()
 531                                 del units[0] # do not display .base_unit description key
 532
 533                                 #Restore oldest selection first.
 534                                 if self._selected_units[self._selected_category][1]:
 535                                         unit_no = 0
 536                                         for unit in units:
 537                                                 if unit == self._selected_units[self._selected_category][1]:
 538                                                         self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
 539                                                 unit_no = unit_no+1
 540
 541                                 #Restore newest selection second.
 542                                 unit_no = 0
 543                                 for unit in units:
 544                                         if unit == self._selected_units[self._selected_category][0]:
 545                                                 self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
 546                                         unit_no = unit_no+1
 547
 548                 # select the text so user can start typing right away
 549                 self._unitValue.grab_focus()
 550                 self._unitValue.select_region(0, -1)
 551
 552         def _on_button_released(self, row, a):
 553                 self._on_click_unit(row)
 554
 555         def _on_click_unit(self, row):
 556                 self._calcsuppress = True #suppress calculations
 557
 558                 #Determine the contents of the selected row.
 559                 selected, iter = self._unitsView.get_selection().get_selected()
 560
 561                 selected_unit = selected.get_value(iter, 0)
 562
 563                 unit_spec = self._unitDataInCategory[selected_unit]
 564
 565                 #Clear out the description
 566                 text_model = gtk.TextBuffer(None)
 567                 self._unitDescription.set_buffer(text_model)
 568
 569                 enditer = text_model.get_end_iter()
 570                 text_model.insert(enditer, unit_spec[2])
 571
 572                 if self._unitName.get_text() != selected_unit:
 573                         self._previousUnitName.set_text(self._unitName.get_text())
 574                         self._previousUnitValue.set_text(self._unitValue.get_text())
 575                         if self._unitSymbol.get() == None:
 576                                 self._previousUnitSymbol.set_text('')
 577                         else:
 578                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
 579                 self._unitName.set_text(selected_unit)
 580
 581                 self._unitValue.set_text(selected.get_value(iter, 1))
 582
 583                 self._unitSymbol.set_text(unit_spec[1]) # put units into label text
 584                 if self._unitValue.get_text() == '':
 585                         if self._selected_category == "Computer Numbers":
 586                                 self._unitValue.set_text("0")
 587                         else:
 588                                 self._unitValue.set_text("0.0")
 589
 590                 #For historical purposes, record this unit as the most recent one in this category.
 591                 # Also, if a previous unit exists, then shift that previous unit to oldest unit.
 592                 if self._selected_category in self._selected_units:
 593                         if self._selected_units[self._selected_category][0]:
 594                                 self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
 595                 else:
 596                         self._selected_units[self._selected_category] = [selected_unit, '']
 597
 598                 # select the text so user can start typing right away
 599                 self._unitValue.grab_focus()
 600                 self._unitValue.select_region(0, -1)
 601
 602                 self._calcsuppress = False #enable calculations
 603
 604         def messagebox_ok_clicked(self, a):
 605                 messagebox.hide()
 606
 607         def _on_user_write_units(self, a):
 608                 ''"Write the list of categories and units to stdout for documentation purposes.''"
 609                 messagebox_model = gtk.TextBuffer(None)
 610                 messageboxtext.set_buffer(messagebox_model)
 611                 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)
 612                 messagebox.show()
 613                 while gtk.events_pending():
 614                         gtk.mainiteration(False)
 615
 616                 total_categories = 0
 617                 total_units = 0
 618                 print 'gonvert-%s%s' % (
 619                         constants.__version__,
 620                         _(u' - Unit Conversion Utility  - Convertible units listing: ')
 621                 )
 622                 for category_key in unit_data.UNIT_CATEGORIES:
 623                         total_categories = total_categories + 1
 624                         print category_key, ": "
 625                         self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[category_key]
 626                         unit_keys = self._unitDataInCategory.keys()
 627                         unit_keys.sort()
 628                         del unit_keys[0] # do not display .base_unit description key
 629                         for unit_key in unit_keys:
 630                                 total_units = total_units + 1
 631                                 print "\t", unit_key
 632                 print total_categories, ' categories'
 633                 print total_units, ' units'
 634
 635         def _on_unit_value_changed(self, a):
 636                 if self._calcsuppress:
 637                         #self._calcsuppress = False
 638                         return
 639                 # determine if value to be calculated is empty
 640                 if self._selected_category == "Computer Numbers":
 641                         if self._unitValue.get_text() == '':
 642                                 value = '0'
 643                         else:
 644                                 value = self._unitValue.get_text()
 645                 else:
 646                         if self._unitValue.get_text() == '':
 647                                 value = 0.0
 648                         else:
 649                                 value = float(self._unitValue.get_text())
 650
 651                 if self._unitName.get_text() != '':
 652                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 653                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 654
 655                         keys = self._unitDataInCategory.keys()
 656                         keys.sort()
 657                         del keys[0]
 658                         row = 0
 659
 660                         #point to the first row
 661                         iter = self._unitModel.get_iter_first()
 662
 663                         while iter:
 664                                 #get the formula from the name at the row
 665                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 666
 667                                 #set the result in the value column
 668                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 669
 670                                 #point to the next row in the self._unitModel
 671                                 iter = self._unitModel.iter_next(iter)
 672
 673                         # if the second row has a unit then update its value
 674                         if self._previousUnitName.get_text() != '':
 675                                 self._calcsuppress = True
 676                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 677                                 self._previousUnitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 678                                 self._calcsuppress = False
 679
 680         def _on_previous_unit_value_changed(self, a):
 681                 if self._calcsuppress == True:
 682                         #self._calcsuppress = False
 683                         return
 684                 # determine if value to be calculated is empty
 685                 if self._selected_category == "Computer Numbers":
 686                         if self._previousUnitValue.get_text() == '':
 687                                 value = '0'
 688                         else:
 689                                 value = self._previousUnitValue.get_text()
 690                 else:
 691                         if self._previousUnitValue.get_text() == '':
 692                                 value = 0.0
 693                         else:
 694                                 value = float(self._previousUnitValue.get_text())
 695
 696                 if self._previousUnitName.get_text() != '':
 697                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 698                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 699
 700                         keys = self._unitDataInCategory.keys()
 701                         keys.sort()
 702                         del keys[0]
 703                         row = 0
 704
 705                         #point to the first row
 706                         iter = self._unitModel.get_iter_first()
 707
 708                         while iter:
 709                                 #get the formula from the name at the row
 710                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 711
 712                                 #set the result in the value column
 713                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 714
 715                                 #point to the next row in the self._unitModel
 716                                 iter = self._unitModel.iter_next(iter)
 717
 718                         # if the second row has a unit then update its value
 719                         if self._unitName.get_text() != '':
 720                                 self._calcsuppress = True
 721                                 func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 722                                 self._unitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 723                                 self._calcsuppress = False
 724
 725         def _on_about_clicked(self, a):
 726                 dlg = gtk.AboutDialog()
 727                 dlg.set_name(constants.__pretty_app_name__)
 728                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
 729                 dlg.set_copyright("Copyright 2009 - GPL")
 730                 dlg.set_comments("")
 731                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
 732                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
 733                 dlg.run()
 734                 dlg.destroy()
 735
 736         def _on_user_exit(self, *args):
 737                 try:
 738                         self._save_settings()
 739                 except Exception:
 740                         _moduleLogger.exception()
 741                 finally:
 742                         gtk.main_quit()
 743
 744
 745 def main():
 746         logging.basicConfig(level = logging.DEBUG)
 747         try:
 748                 os.makedirs(constants._data_path_)
 749         except OSError, e:
 750                 if e.errno != 17:
 751                         raise
 752
 753         gonvert = Gonvert()
 754         gtk.main()
 755
 756
 757 if __name__ == "__main__":
 758         main()