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 _on_shortlist_changed(self, a):
 250                 try:
 251                         raise NotImplementedError("%s" % self._shortlistcheck.get_active())
 252                 except Exception:
 253                         _moduleLogger.exception()
 254
 255         def _on_edit_shortlist(self, a):
 256                 try:
 257                         raise NotImplementedError("%s" % self._toggleShortList.get_active())
 258                 except Exception:
 259                         _moduleLogger.exception()
 260
 261         def _on_user_clear_selections(self, a):
 262                 try:
 263                         selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 264                         os.remove(selectionsDatPath)
 265                         self._selected_units = {}
 266                 except Exception:
 267                         _moduleLogger.exception()
 268
 269         def _on_user_exit(self, a):
 270                 try:
 271                         self._save_settings()
 272                 except Exception:
 273                         _moduleLogger.exception()
 274                 finally:
 275                         gtk.main_quit()
 276
 277         def _on_findEntry_changed(self, a):
 278                 """
 279                 Clear out find results since the user wants to look for something new
 280                 """
 281                 try:
 282                         # switch to "new find" state
 283                         self._find_result = []
 284                         self._find_count = 0
 285
 286                         # Clear our user message
 287                         self._findLabel.set_text('')
 288                 except Exception:
 289                         _moduleLogger.exception()
 290
 291         def _find_first(self):
 292                 assert len(self._find_result) == 0
 293                 assert self._find_count == 0
 294                 findString = string.lower(string.strip(self._findEntry.get_text()))
 295                 if not findString:
 296                         return
 297
 298                 # Gather info on all the matching units from all categories
 299                 for catIndex, category in enumerate(unit_data.UNIT_CATEGORIES):
 300                         units = unit_data.get_units(category)
 301                         for unitIndex, unit in enumerate(units):
 302                                 loweredUnit = unit.lower()
 303                                 if loweredUnit in findString or findString in loweredUnit:
 304                                         self._find_result.append((category, unit, catIndex, unitIndex))
 305
 306                 if not self._find_result:
 307                         return
 308
 309                 self._select_found_unit()
 310
 311         def _find_wrap_around(self):
 312                 assert 0 < len(self._find_result)
 313                 assert self._find_count + 1 == len(self._find_result)
 314                 #select first result
 315                 self._find_count = 0
 316                 self._select_found_unit()
 317
 318         def _find_next(self):
 319                 assert 0 < len(self._find_result)
 320                 assert self._find_count + 1 < len(self._find_result)
 321                 self._find_count += 1
 322                 self._select_found_unit()
 323
 324         def _select_found_unit(self):
 325                 assert 0 < len(self._find_result)
 326                 #check if next find is in a new category (prevent category changes when unnecessary
 327                 if self._selected_category != self._find_result[self._find_count][0]:
 328                         self._categoryView.set_cursor(self._find_result[self._find_count][2], self._categoryColumn, False)
 329                 self._unitsView.set_cursor(self._find_result[self._find_count][3], self._unitNameColumn, True)
 330
 331         def _on_find_activate(self, a):
 332                 """
 333                 check if 'new find' or 'last find' or 'next-find'
 334
 335                 new-find = run the find algorithm which also selects the first found unit
 336                          = self._find_count = 0 and self._find_result = []
 337
 338                 last-find = restart from top again
 339                           = self._find_count = len(self._find_result)
 340
 341                 next-find = continue to next found location
 342                            = self._find_count = 0 and len(self._find_result)>0
 343                 """
 344                 try:
 345                         if len(self._find_result) == 0:
 346                                 self._find_first()
 347                         else:
 348                                 if self._find_count == len(self._find_result)-1:
 349                                         self._find_wrap_around()
 350                                 else:
 351                                         self._find_next()
 352
 353                         if not self._find_result:
 354                                 self._findLabel.set_text('Text not found')
 355                         else:
 356                                 resultsLeft = len(self._find_result) - self._find_count - 1
 357                                 self._findLabel.set_text(
 358                                         '%s result(s) left' % (resultsLeft, )
 359                                 )
 360                 except Exception:
 361                         _moduleLogger.exception()
 362
 363         def _on_click_unit_column(self, col):
 364                 """
 365                 Sort the contents of the col when the user clicks on the title.
 366                 """
 367                 #Determine which column requires sorting
 368                 if col is self._unitNameColumn:
 369                         selectedUnitColumn = 0
 370                         self._unitNameColumn.set_sort_indicator(True)
 371                         self._unitValueColumn.set_sort_indicator(False)
 372                         self._unitSymbolColumn.set_sort_indicator(False)
 373                         self._unitNameColumn.set_sort_order(not self._unit_sort_direction)
 374                 elif col is self._unitValueColumn:
 375                         selectedUnitColumn = 1
 376                         self._unitNameColumn.set_sort_indicator(False)
 377                         self._unitValueColumn.set_sort_indicator(True)
 378                         self._unitSymbolColumn.set_sort_indicator(False)
 379                         self._unitValueColumn.set_sort_order(not self._value_sort_direction)
 380                 elif col is self._unitSymbolColumn:
 381                         selectedUnitColumn = 2
 382                         self._unitNameColumn.set_sort_indicator(False)
 383                         self._unitValueColumn.set_sort_indicator(False)
 384                         self._unitSymbolColumn.set_sort_indicator(True)
 385                         self._unitSymbolColumn.set_sort_order(not self._units_sort_direction)
 386                 else:
 387                         assert False, "Unknown column: %s" % (col.get_title(), )
 388
 389                 #declare a spot to hold the sorted list
 390                 sorted_list = []
 391
 392                 #point to the first row
 393                 iter = self._unitModel.get_iter_first()
 394                 row = 0
 395
 396                 while iter:
 397                         #grab all text from columns for sorting
 398
 399                         #get the text from each column
 400                         unit_text = self._unitModel.get_value(iter, 0)
 401                         units_text = self._unitModel.get_value(iter, 2)
 402
 403                         #do not bother sorting if the value column is empty
 404                         if self._unitModel.get_value(iter, 1) == '' and selectedUnitColumn == 1:
 405                                 return
 406
 407                         #special sorting exceptions for ascii values (instead of float values)
 408                         if self._selected_category == "Computer Numbers":
 409                                 value_text = self._unitModel.get_value(iter, 1)
 410                         else:
 411                                 if self._unitModel.get_value(iter, 1) == None or self._unitModel.get_value(iter, 1) == '':
 412                                         value_text = ''
 413                                 else:
 414                                         value_text = float(self._unitModel.get_value(iter, 1))
 415
 416                         if selectedUnitColumn == 0:
 417                                 sorted_list.append((unit_text, value_text, units_text))
 418                         elif selectedUnitColumn == 1:
 419                                 sorted_list.append((value_text, unit_text, units_text))
 420                         else:
 421                                 sorted_list.append((units_text, value_text, unit_text))
 422
 423                         #point to the next row in the self._unitModel
 424                         iter = self._unitModel.iter_next(iter)
 425                         row = row+1
 426
 427                 #check if no calculations have been made yet (don't bother sorting)
 428                 if row == 0:
 429                         return
 430                 else:
 431                         if selectedUnitColumn == 0:
 432                                 if not self._unit_sort_direction:
 433                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(x), string.lower(y)))
 434                                         self._unit_sort_direction = True
 435                                 else:
 436                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(y), string.lower(x)))
 437                                         self._unit_sort_direction = False
 438                         elif selectedUnitColumn == 1:
 439                                 sorted_list.sort()
 440                                 if not self._value_sort_direction:
 441                                         self._value_sort_direction = True
 442                                 else:
 443                                         sorted_list.reverse()
 444                                         self._value_sort_direction = False
 445                         else:
 446                                 if not self._units_sort_direction:
 447                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(x), string.lower(y)))
 448                                         self._units_sort_direction = True
 449                                 else:
 450                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(y), string.lower(x)))
 451                                         self._units_sort_direction = False
 452
 453                         #Clear out the previous list of units
 454                         self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 455                         self._unitsView.set_model(self._unitModel)
 456
 457                         #colourize each row differently for easier reading
 458                         self._unitsView.set_property('rules_hint', 1)
 459
 460                         #Clear out the description
 461                         text_model = gtk.TextBuffer(None)
 462                         self._unitDescription.set_buffer(text_model)
 463
 464                         if selectedUnitColumn == 0:
 465                                 for unit, value, units in sorted_list:
 466                                         iter = self._unitModel.append()
 467                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
 468                         elif selectedUnitColumn == 1:
 469                                 for value, unit, units in sorted_list:
 470                                         iter = self._unitModel.append()
 471                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
 472                         else:
 473                                 for units, value, unit in sorted_list:
 474                                         iter = self._unitModel.append()
 475                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
 476                 return
 477
 478         def _on_click_category(self, row):
 479                 #Clear out the previous list of units
 480                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 481                 self._unitsView.set_model(self._unitModel)
 482
 483                 #Colourize each row alternately for easier reading
 484                 self._unitsView.set_property('rules_hint', 1)
 485
 486                 #Clear out the description
 487                 text_model = gtk.TextBuffer(None)
 488                 self._unitDescription.set_buffer(text_model)
 489
 490                 #Determine the contents of the selected category row
 491                 selected, iter = row.get_selection().get_selected()
 492
 493                 self._selected_category = self._categoryModel.get_value(iter, 0)
 494
 495                 self._unit_sort_direction = False
 496                 self._value_sort_direction = False
 497                 self._units_sort_direction = False
 498                 self._unitNameColumn.set_sort_indicator(False)
 499                 self._unitValueColumn.set_sort_indicator(False)
 500                 self._unitSymbolColumn.set_sort_indicator(False)
 501
 502                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[selected.get_value(iter, 0)]
 503                 keys = self._unitDataInCategory.keys()
 504                 keys.sort()
 505                 del keys[0] # do not display .base_unit description key
 506
 507                 #Fill up the units descriptions and clear the value cells
 508                 for key in keys:
 509                         iter = self._unitModel.append()
 510                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
 511
 512                 self._unitName.set_text('')
 513                 self._unitValue.set_text('')
 514                 self._previousUnitName.set_text('')
 515                 self._previousUnitValue.set_text('')
 516                 self._unitSymbol.set_text('')
 517                 self._previousUnitSymbol.set_text('')
 518
 519                 self.restore_units()
 520
 521         def restore_units(self):
 522                 # Restore the previous historical settings of previously selected units in this newly selected category
 523                 #Since category has just been clicked, the list will be sorted already.
 524                 if self._selected_category in self._selected_units:
 525                         if self._selected_units[self._selected_category][0]:
 526                                 #self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
 527
 528                                 units = unit_data.UNIT_DESCRIPTIONS[self._selected_category].keys()
 529                                 units.sort()
 530                                 del units[0] # do not display .base_unit description key
 531
 532                                 #Restore oldest selection first.
 533                                 if self._selected_units[self._selected_category][1]:
 534                                         unit_no = 0
 535                                         for unit in units:
 536                                                 if unit == self._selected_units[self._selected_category][1]:
 537                                                         self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
 538                                                 unit_no = unit_no+1
 539
 540                                 #Restore newest selection second.
 541                                 unit_no = 0
 542                                 for unit in units:
 543                                         if unit == self._selected_units[self._selected_category][0]:
 544                                                 self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
 545                                         unit_no = unit_no+1
 546
 547                 # select the text so user can start typing right away
 548                 self._unitValue.grab_focus()
 549                 self._unitValue.select_region(0, -1)
 550
 551         def _on_button_released(self, row, a):
 552                 self._on_click_unit(row)
 553
 554         def _on_click_unit(self, row):
 555                 self._calcsuppress = True #suppress calculations
 556
 557                 #Determine the contents of the selected row.
 558                 selected, iter = self._unitsView.get_selection().get_selected()
 559
 560                 selected_unit = selected.get_value(iter, 0)
 561
 562                 unit_spec = self._unitDataInCategory[selected_unit]
 563
 564                 #Clear out the description
 565                 text_model = gtk.TextBuffer(None)
 566                 self._unitDescription.set_buffer(text_model)
 567
 568                 enditer = text_model.get_end_iter()
 569                 text_model.insert(enditer, unit_spec[2])
 570
 571                 if self._unitName.get_text() != selected_unit:
 572                         self._previousUnitName.set_text(self._unitName.get_text())
 573                         self._previousUnitValue.set_text(self._unitValue.get_text())
 574                         if self._unitSymbol.get() == None:
 575                                 self._previousUnitSymbol.set_text('')
 576                         else:
 577                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
 578                 self._unitName.set_text(selected_unit)
 579
 580                 self._unitValue.set_text(selected.get_value(iter, 1))
 581
 582                 self._unitSymbol.set_text(unit_spec[1]) # put units into label text
 583                 if self._unitValue.get_text() == '':
 584                         if self._selected_category == "Computer Numbers":
 585                                 self._unitValue.set_text("0")
 586                         else:
 587                                 self._unitValue.set_text("0.0")
 588
 589                 #For historical purposes, record this unit as the most recent one in this category.
 590                 # Also, if a previous unit exists, then shift that previous unit to oldest unit.
 591                 if self._selected_category in self._selected_units:
 592                         if self._selected_units[self._selected_category][0]:
 593                                 self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
 594                 else:
 595                         self._selected_units[self._selected_category] = [selected_unit, '']
 596
 597                 # select the text so user can start typing right away
 598                 self._unitValue.grab_focus()
 599                 self._unitValue.select_region(0, -1)
 600
 601                 self._calcsuppress = False #enable calculations
 602
 603         def messagebox_ok_clicked(self, a):
 604                 messagebox.hide()
 605
 606         def _on_user_write_units(self, a):
 607                 ''"Write the list of categories and units to stdout for documentation purposes.''"
 608                 messagebox_model = gtk.TextBuffer(None)
 609                 messageboxtext.set_buffer(messagebox_model)
 610                 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)
 611                 messagebox.show()
 612                 while gtk.events_pending():
 613                         gtk.mainiteration(False)
 614
 615                 total_categories = 0
 616                 total_units = 0
 617                 print 'gonvert-%s%s' % (
 618                         constants.__version__,
 619                         _(u' - Unit Conversion Utility  - Convertible units listing: ')
 620                 )
 621                 for category_key in unit_data.UNIT_CATEGORIES:
 622                         total_categories = total_categories + 1
 623                         print category_key, ": "
 624                         self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[category_key]
 625                         unit_keys = self._unitDataInCategory.keys()
 626                         unit_keys.sort()
 627                         del unit_keys[0] # do not display .base_unit description key
 628                         for unit_key in unit_keys:
 629                                 total_units = total_units + 1
 630                                 print "\t", unit_key
 631                 print total_categories, ' categories'
 632                 print total_units, ' units'
 633
 634         def _on_unit_value_changed(self, a):
 635                 if self._calcsuppress:
 636                         #self._calcsuppress = False
 637                         return
 638                 # determine if value to be calculated is empty
 639                 if self._selected_category == "Computer Numbers":
 640                         if self._unitValue.get_text() == '':
 641                                 value = '0'
 642                         else:
 643                                 value = self._unitValue.get_text()
 644                 else:
 645                         if self._unitValue.get_text() == '':
 646                                 value = 0.0
 647                         else:
 648                                 value = float(self._unitValue.get_text())
 649
 650                 if self._unitName.get_text() != '':
 651                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 652                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 653
 654                         keys = self._unitDataInCategory.keys()
 655                         keys.sort()
 656                         del keys[0]
 657                         row = 0
 658
 659                         #point to the first row
 660                         iter = self._unitModel.get_iter_first()
 661
 662                         while iter:
 663                                 #get the formula from the name at the row
 664                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 665
 666                                 #set the result in the value column
 667                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 668
 669                                 #point to the next row in the self._unitModel
 670                                 iter = self._unitModel.iter_next(iter)
 671
 672                         # if the second row has a unit then update its value
 673                         if self._previousUnitName.get_text() != '':
 674                                 self._calcsuppress = True
 675                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 676                                 self._previousUnitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 677                                 self._calcsuppress = False
 678
 679         def _on_previous_unit_value_changed(self, a):
 680                 if self._calcsuppress == True:
 681                         #self._calcsuppress = False
 682                         return
 683                 # determine if value to be calculated is empty
 684                 if self._selected_category == "Computer Numbers":
 685                         if self._previousUnitValue.get_text() == '':
 686                                 value = '0'
 687                         else:
 688                                 value = self._previousUnitValue.get_text()
 689                 else:
 690                         if self._previousUnitValue.get_text() == '':
 691                                 value = 0.0
 692                         else:
 693                                 value = float(self._previousUnitValue.get_text())
 694
 695                 if self._previousUnitName.get_text() != '':
 696                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 697                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 698
 699                         keys = self._unitDataInCategory.keys()
 700                         keys.sort()
 701                         del keys[0]
 702                         row = 0
 703
 704                         #point to the first row
 705                         iter = self._unitModel.get_iter_first()
 706
 707                         while iter:
 708                                 #get the formula from the name at the row
 709                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 710
 711                                 #set the result in the value column
 712                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 713
 714                                 #point to the next row in the self._unitModel
 715                                 iter = self._unitModel.iter_next(iter)
 716
 717                         # if the second row has a unit then update its value
 718                         if self._unitName.get_text() != '':
 719                                 self._calcsuppress = True
 720                                 func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 721                                 self._unitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 722                                 self._calcsuppress = False
 723
 724         def _on_about_clicked(self, a):
 725                 dlg = gtk.AboutDialog()
 726                 dlg.set_name(constants.__pretty_app_name__)
 727                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
 728                 dlg.set_copyright("Copyright 2009 - GPL")
 729                 dlg.set_comments("")
 730                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
 731                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
 732                 dlg.run()
 733                 dlg.destroy()
 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()