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