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