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_user_find_units,
 152                         "on_findEntry_key_press_event": self._on_find_key_press,
 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                 #Restore window size from previously saved settings if it exists and is valid.
 172                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 173                 if os.path.exists(windowDatPath):
 174                         #Retrieving previous window settings from ~/.gonvert/window.dat
 175                         saved_window = pickle.load(open(windowDatPath, "r"))
 176                         #If the 'size' has been stored, then extract size from saved_window.
 177                         if 'size' in saved_window:
 178                                 a, b = saved_window['size']
 179                                 self._mainWindow.resize(a, b)
 180                         else:
 181                                 #Maximize if no previous size was found
 182                                 #self._mainWindow.maximize()
 183                                 pass
 184                 else:
 185                         #Maximize if no previous window.dat file was found
 186                         #self._mainWindow.maximize()
 187                         pass
 188
 189                 #Restore selections from previously saved settings if it exists and is valid.
 190                 historical_catergory_found = False
 191                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 192                 if os.path.exists(selectionsDatPath):
 193                         #Retrieving previous selections from ~/.gonvert/selections.dat
 194                         selections = pickle.load(open(selectionsDatPath, 'r'))
 195                         #Restoring previous selections.
 196                         #If the 'selected_unts' has been stored, then extract self._selected_units from selections.
 197                         if 'selected_units' in selections:
 198                                 self._selected_units = selections['selected_units']
 199                         #Make sure that the 'self._selected_category' has been stored.
 200                         if 'selected_category' in selections:
 201                                 #Match an available category to the previously selected category.
 202                                 for counter in range(len(unit_data.UNIT_CATEGORIES)):
 203                                         if selections['selected_category'] == unit_data.UNIT_CATEGORIES[counter]:
 204                                                 # Restore the previously selected category.
 205                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
 206                                                 self._categoryView.grab_focus()
 207                                 historical_catergory_found = True
 208
 209                 if not historical_catergory_found:
 210                         print "Couldn't find saved category, using default."
 211                         #If historical records were not kept then default to
 212                         # put the focus on the first category
 213                         self._categoryView.set_cursor(0, self._categoryColumn, False)
 214                         self._categoryView.grab_focus()
 215
 216                 self.restore_units()
 217
 218         def _on_shortlist_changed(self, a):
 219                 raise NotImplementedError("%s" % self._shortlistcheck.get_active())
 220
 221         def _on_edit_shortlist(self, a):
 222                 raise NotImplementedError("%s" % self._toggleShortList.get_active())
 223
 224         def _on_user_clear_selections(self, a):
 225                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 226                 os.remove(selectionsDatPath)
 227                 self._selected_units = {}
 228
 229         def _on_user_exit(self, a):
 230                 """
 231                 This routine saves the selections to a file, and
 232                 should therefore only be called when exiting the program.
 233
 234                 Update selections dictionary which consists of the following keys:
 235                 'self._selected_category': full name of selected category
 236                 'self._selected_units': self._selected_units dictionary which contains:
 237                 [categoryname: #1 displayed unit, #2 displayed unit]
 238                 """
 239                 #Determine the contents of the selected category row
 240                 selected, iter = self._categoryView.get_selection().get_selected()
 241                 self._selected_category = self._categoryModel.get_value(iter, 0)
 242
 243                 selections = {
 244                         'selected_category': self._selected_category,
 245                         'selected_units': self._selected_units
 246                 }
 247                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 248                 pickle.dump(selections, open(selectionsDatPath, 'w'))
 249
 250                 #Get last size of app and save it
 251                 window_settings = {
 252                         'size': self._mainWindow.get_size()
 253                 }
 254                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 255                 pickle.dump(window_settings, open(windowDatPath, 'w'))
 256
 257                 gtk.mainquit
 258                 sys.exit()
 259
 260         def _on_findEntry_changed(self, a):
 261                 #Clear out find results since the user wants to look for something new
 262                 self._find_result = [] #empty find result list
 263                 self._find_count = 0 #default to find result number zero
 264                 self._findLabel.set_text('') #clear result
 265
 266         def _on_find_key_press(self, a, b):
 267                 #Check if the key pressed was an ASCII key
 268                 if len(b.string)>0:
 269                         #Check if the key pressed was the 'Enter' key
 270                         if ord(b.string[0]) == 13:
 271                                 #Execute the find units function
 272                                 self._on_user_find_units(1)
 273
 274         def _on_about_clicked(self, a):
 275                 dlg = gtk.AboutDialog()
 276                 dlg.set_name(constants.__pretty_app_name__)
 277                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
 278                 dlg.set_copyright("Copyright 2009 - GPL")
 279                 dlg.set_comments("")
 280                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
 281                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
 282                 dlg.run()
 283                 dlg.destroy()
 284
 285         def messagebox_ok_clicked(self, a):
 286                 messagebox.hide()
 287
 288         def _on_user_find_units(self, a):
 289                 #check if 'new find' or 'last find' or 'next-find'
 290
 291                 #new-find = run the find algorithm which also selects the first found unit
 292                 #         = self._find_count = 0 and self._find_result = []
 293
 294                 #last-find = restart from top again
 295                 #          = self._find_count = len(self._find_result)
 296
 297                 #next-find = continue to next found location
 298                 #           = self._find_count = 0 and len(self._find_result)>0
 299
 300                 #check for new-find
 301                 if len(self._find_result) == 0:
 302                         find_string = string.lower(string.strip(self._findEntry.get_text()))
 303                         #Make sure that a valid find string has been requested
 304                         if len(find_string)>0:
 305                                 found_a_unit = 0 #reset the 'found-a-unit' flag
 306                                 cat_no = 0
 307                                 for category in unit_data.UNIT_CATEGORIES:
 308                                         units = unit_data.UNIT_DESCRIPTIONS[category].keys()
 309                                         units.sort()
 310                                         del units[0] # do not display .base_unit description key
 311                                         unit_no = 0
 312                                         for unit in units:
 313                                                 if string.find(string.lower(unit), find_string) >= 0:
 314                                                         found_a_unit = 1 #indicate that a unit was found
 315                                                         #print "'", find_string, "'", " found at category = ", category, " unit = ", unit
 316                                                         self._find_result.append((category, unit, cat_no, unit_no))
 317                                                 unit_no = unit_no+1
 318                                         cat_no = cat_no+1
 319
 320                                 if found_a_unit == 1:
 321                                         #select the first found unit
 322                                         self._find_count = 0
 323                                         #check if next find is in a new category (prevent category changes when unnecessary
 324                                         if self._selected_category != self._find_result[self._find_count][0]:
 325                                                 self._categoryView.set_cursor(self._find_result[0][2], self._categoryColumn, False)
 326                                                 self._unitsView.set_cursor(self._find_result[0][3], self._unitNameColumn, True)
 327                                                 if len(self._find_result)>1:
 328                                                         self._findLabel.set_text(('Press Find for next unit. '+ str(len(self._find_result))+' result(s).'))
 329                                                 else:
 330                                                         self._findLabel.set_text('Text not found') #Display error
 331                 else: #must be next-find or last-find
 332                         #check for last-find
 333                         if self._find_count == len(self._find_result)-1:
 334                                 #select first result
 335                                 self._find_count = 0
 336                                 self._categoryView.set_cursor(self._find_result[self._find_count][2], self._categoryColumn, False)
 337                                 self._unitsView.set_cursor(self._find_result[self._find_count][3], self._unitNameColumn, True)
 338                         else: #must be next-find
 339                                 self._find_count = self._find_count+1
 340                                 #check if next find is in a new category (prevent category changes when unnecessary
 341                                 if self._selected_category != self._find_result[self._find_count][0]:
 342                                         self._categoryView.set_cursor(self._find_result[self._find_count][2], self._categoryColumn, False)
 343                                 self._unitsView.set_cursor(self._find_result[self._find_count][3], self._unitNameColumn, True)
 344
 345         def _on_click_unit_column(self, col):
 346                 """
 347                 Sort the contents of the col when the user clicks on the title.
 348                 """
 349                 #Determine which column requires sorting
 350                 if col is self._unitNameColumn:
 351                         selectedUnitColumn = 0
 352                         self._unitNameColumn.set_sort_indicator(True)
 353                         self._unitValueColumn.set_sort_indicator(False)
 354                         self._unitSymbolColumn.set_sort_indicator(False)
 355                         self._unitNameColumn.set_sort_order(not self._unit_sort_direction)
 356                 elif col is self._unitValueColumn:
 357                         selectedUnitColumn = 1
 358                         self._unitNameColumn.set_sort_indicator(False)
 359                         self._unitValueColumn.set_sort_indicator(True)
 360                         self._unitSymbolColumn.set_sort_indicator(False)
 361                         self._unitValueColumn.set_sort_order(not self._value_sort_direction)
 362                 elif col is self._unitSymbolColumn:
 363                         selectedUnitColumn = 2
 364                         self._unitNameColumn.set_sort_indicator(False)
 365                         self._unitValueColumn.set_sort_indicator(False)
 366                         self._unitSymbolColumn.set_sort_indicator(True)
 367                         self._unitSymbolColumn.set_sort_order(not self._units_sort_direction)
 368                 else:
 369                         assert False, "Unknown column: %s" % (col.get_title(), )
 370
 371                 #declare a spot to hold the sorted list
 372                 sorted_list = []
 373
 374                 #point to the first row
 375                 iter = self._unitModel.get_iter_first()
 376                 row = 0
 377
 378                 while iter:
 379                         #grab all text from columns for sorting
 380
 381                         #get the text from each column
 382                         unit_text = self._unitModel.get_value(iter, 0)
 383                         units_text = self._unitModel.get_value(iter, 2)
 384
 385                         #do not bother sorting if the value column is empty
 386                         if self._unitModel.get_value(iter, 1) == '' and selectedUnitColumn == 1:
 387                                 return
 388
 389                         #special sorting exceptions for ascii values (instead of float values)
 390                         if self._selected_category == "Computer Numbers":
 391                                 value_text = self._unitModel.get_value(iter, 1)
 392                         else:
 393                                 if self._unitModel.get_value(iter, 1) == None or self._unitModel.get_value(iter, 1) == '':
 394                                         value_text = ''
 395                                 else:
 396                                         value_text = float(self._unitModel.get_value(iter, 1))
 397
 398                         if selectedUnitColumn == 0:
 399                                 sorted_list.append((unit_text, value_text, units_text))
 400                         elif selectedUnitColumn == 1:
 401                                 sorted_list.append((value_text, unit_text, units_text))
 402                         else:
 403                                 sorted_list.append((units_text, value_text, unit_text))
 404
 405                         #point to the next row in the self._unitModel
 406                         iter = self._unitModel.iter_next(iter)
 407                         row = row+1
 408
 409                 #check if no calculations have been made yet (don't bother sorting)
 410                 if row == 0:
 411                         return
 412                 else:
 413                         if selectedUnitColumn == 0:
 414                                 if not self._unit_sort_direction:
 415                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(x), string.lower(y)))
 416                                         self._unit_sort_direction = True
 417                                 else:
 418                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(y), string.lower(x)))
 419                                         self._unit_sort_direction = False
 420                         elif selectedUnitColumn == 1:
 421                                 sorted_list.sort()
 422                                 if not self._value_sort_direction:
 423                                         self._value_sort_direction = True
 424                                 else:
 425                                         sorted_list.reverse()
 426                                         self._value_sort_direction = False
 427                         else:
 428                                 if not self._units_sort_direction:
 429                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(x), string.lower(y)))
 430                                         self._units_sort_direction = True
 431                                 else:
 432                                         sorted_list.sort(lambda (x, xx, xxx), (y, yy, yyy): cmp(string.lower(y), string.lower(x)))
 433                                         self._units_sort_direction = False
 434
 435                         #Clear out the previous list of units
 436                         self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 437                         self._unitsView.set_model(self._unitModel)
 438
 439                         #colourize each row differently for easier reading
 440                         self._unitsView.set_property('rules_hint', 1)
 441
 442                         #Clear out the description
 443                         text_model = gtk.TextBuffer(None)
 444                         self._unitDescription.set_buffer(text_model)
 445
 446                         if selectedUnitColumn == 0:
 447                                 for unit, value, units in sorted_list:
 448                                         iter = self._unitModel.append()
 449                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
 450                         elif selectedUnitColumn == 1:
 451                                 for value, unit, units in sorted_list:
 452                                         iter = self._unitModel.append()
 453                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
 454                         else:
 455                                 for units, value, unit in sorted_list:
 456                                         iter = self._unitModel.append()
 457                                         self._unitModel.set(iter, 0, unit, 1, str(value), 2, units)
 458                 return
 459
 460         def _on_click_category(self, row):
 461                 #Clear out the previous list of units
 462                 self._unitModel = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_STRING, gobject.TYPE_STRING)
 463                 self._unitsView.set_model(self._unitModel)
 464
 465                 #Colourize each row alternately for easier reading
 466                 self._unitsView.set_property('rules_hint', 1)
 467
 468                 #Clear out the description
 469                 text_model = gtk.TextBuffer(None)
 470                 self._unitDescription.set_buffer(text_model)
 471
 472                 #Determine the contents of the selected category row
 473                 selected, iter = row.get_selection().get_selected()
 474
 475                 self._selected_category = self._categoryModel.get_value(iter, 0)
 476
 477                 self._unit_sort_direction = False
 478                 self._value_sort_direction = False
 479                 self._units_sort_direction = False
 480                 self._unitNameColumn.set_sort_indicator(False)
 481                 self._unitValueColumn.set_sort_indicator(False)
 482                 self._unitSymbolColumn.set_sort_indicator(False)
 483
 484                 self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[selected.get_value(iter, 0)]
 485                 keys = self._unitDataInCategory.keys()
 486                 keys.sort()
 487                 del keys[0] # do not display .base_unit description key
 488
 489                 #Fill up the units descriptions and clear the value cells
 490                 for key in keys:
 491                         iter = self._unitModel.append()
 492                         self._unitModel.set(iter, 0, key, 1, '', 2, self._unitDataInCategory[key][1])
 493
 494                 self._unitName.set_text('')
 495                 self._unitValue.set_text('')
 496                 self._previousUnitName.set_text('')
 497                 self._previousUnitValue.set_text('')
 498                 self._unitSymbol.set_text('')
 499                 self._previousUnitSymbol.set_text('')
 500
 501                 self.restore_units()
 502
 503         def restore_units(self):
 504                 # Restore the previous historical settings of previously selected units in this newly selected category
 505                 #Since category has just been clicked, the list will be sorted already.
 506                 if self._selected_category in self._selected_units:
 507                         if self._selected_units[self._selected_category][0]:
 508                                 ''"debug ''"
 509                                 #self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
 510
 511                                 units = unit_data.UNIT_DESCRIPTIONS[self._selected_category].keys()
 512                                 units.sort()
 513                                 del units[0] # do not display .base_unit description key
 514
 515                                 #Restore oldest selection first.
 516                                 if self._selected_units[self._selected_category][1]:
 517                                         unit_no = 0
 518                                         for unit in units:
 519                                                 if unit == self._selected_units[self._selected_category][1]:
 520                                                         self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
 521                                                 unit_no = unit_no+1
 522
 523                                 #Restore newest selection second.
 524                                 unit_no = 0
 525                                 for unit in units:
 526                                         if unit == self._selected_units[self._selected_category][0]:
 527                                                 self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
 528                                         unit_no = unit_no+1
 529
 530                 # select the text so user can start typing right away
 531                 self._unitValue.grab_focus()
 532                 self._unitValue.select_region(0, -1)
 533
 534         def _on_button_released(self, row, a):
 535                 self._on_click_unit(row)
 536
 537         def _on_click_unit(self, row):
 538                 self._calcsuppress = True #suppress calculations
 539
 540                 #Determine the contents of the selected row.
 541                 selected, iter = self._unitsView.get_selection().get_selected()
 542
 543                 selected_unit = selected.get_value(iter, 0)
 544
 545                 unit_spec = self._unitDataInCategory[selected_unit]
 546
 547                 #Clear out the description
 548                 text_model = gtk.TextBuffer(None)
 549                 self._unitDescription.set_buffer(text_model)
 550
 551                 enditer = text_model.get_end_iter()
 552                 text_model.insert(enditer, unit_spec[2])
 553
 554                 if self._unitName.get_text() != selected_unit:
 555                         self._previousUnitName.set_text(self._unitName.get_text())
 556                         self._previousUnitValue.set_text(self._unitValue.get_text())
 557                         if self._unitSymbol.get() == None:
 558                                 self._previousUnitSymbol.set_text('')
 559                         else:
 560                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
 561                 self._unitName.set_text(selected_unit)
 562
 563                 self._unitValue.set_text(selected.get_value(iter, 1))
 564
 565                 self._unitSymbol.set_text(unit_spec[1]) # put units into label text
 566                 if self._unitValue.get_text() == '':
 567                         if self._selected_category == "Computer Numbers":
 568                                 self._unitValue.set_text("0")
 569                         else:
 570                                 self._unitValue.set_text("0.0")
 571
 572                 #For historical purposes, record this unit as the most recent one in this category.
 573                 # Also, if a previous unit exists, then shift that previous unit to oldest unit.
 574                 if self._selected_category in self._selected_units:
 575                         if self._selected_units[self._selected_category][0]:
 576                                 self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
 577                 else:
 578                         self._selected_units[self._selected_category] = [selected_unit, '']
 579
 580                 # select the text so user can start typing right away
 581                 self._unitValue.grab_focus()
 582                 self._unitValue.select_region(0, -1)
 583
 584                 self._calcsuppress = False #enable calculations
 585
 586         def _on_user_write_units(self, a):
 587                 ''"Write the list of categories and units to stdout for documentation purposes.''"
 588                 messagebox_model = gtk.TextBuffer(None)
 589                 messageboxtext.set_buffer(messagebox_model)
 590                 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)
 591                 messagebox.show()
 592                 while gtk.events_pending():
 593                         gtk.mainiteration(False)
 594
 595                 total_categories = 0
 596                 total_units = 0
 597                 print 'gonvert-%s%s' % (
 598                         constants.__version__,
 599                         _(u' - Unit Conversion Utility  - Convertible units listing: ')
 600                 )
 601                 for category_key in unit_data.UNIT_CATEGORIES:
 602                         total_categories = total_categories + 1
 603                         print category_key, ": "
 604                         self._unitDataInCategory = unit_data.UNIT_DESCRIPTIONS[category_key]
 605                         unit_keys = self._unitDataInCategory.keys()
 606                         unit_keys.sort()
 607                         del unit_keys[0] # do not display .base_unit description key
 608                         for unit_key in unit_keys:
 609                                 total_units = total_units + 1
 610                                 print "\t", unit_key
 611                 print total_categories, ' categories'
 612                 print total_units, ' units'
 613
 614         def _on_unit_value_changed(self, a):
 615                 if self._calcsuppress:
 616                         #self._calcsuppress = False
 617                         return
 618                 # determine if value to be calculated is empty
 619                 if self._selected_category == "Computer Numbers":
 620                         if self._unitValue.get_text() == '':
 621                                 value = '0'
 622                         else:
 623                                 value = self._unitValue.get_text()
 624                 else:
 625                         if self._unitValue.get_text() == '':
 626                                 value = 0.0
 627                         else:
 628                                 value = float(self._unitValue.get_text())
 629
 630                 if self._unitName.get_text() != '':
 631                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 632                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 633
 634                         keys = self._unitDataInCategory.keys()
 635                         keys.sort()
 636                         del keys[0]
 637                         row = 0
 638
 639                         #point to the first row
 640                         iter = self._unitModel.get_iter_first()
 641
 642                         while iter:
 643                                 #get the formula from the name at the row
 644                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 645
 646                                 #set the result in the value column
 647                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 648
 649                                 #point to the next row in the self._unitModel
 650                                 iter = self._unitModel.iter_next(iter)
 651
 652                         # if the second row has a unit then update its value
 653                         if self._previousUnitName.get_text() != '':
 654                                 self._calcsuppress = True
 655                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 656                                 self._previousUnitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 657                                 self._calcsuppress = False
 658
 659         def _on_previous_unit_value_changed(self, a):
 660                 if self._calcsuppress == True:
 661                         #self._calcsuppress = False
 662                         return
 663                 # determine if value to be calculated is empty
 664                 if self._selected_category == "Computer Numbers":
 665                         if self._previousUnitValue.get_text() == '':
 666                                 value = '0'
 667                         else:
 668                                 value = self._previousUnitValue.get_text()
 669                 else:
 670                         if self._previousUnitValue.get_text() == '':
 671                                 value = 0.0
 672                         else:
 673                                 value = float(self._previousUnitValue.get_text())
 674
 675                 if self._previousUnitName.get_text() != '':
 676                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 677                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 678
 679                         keys = self._unitDataInCategory.keys()
 680                         keys.sort()
 681                         del keys[0]
 682                         row = 0
 683
 684                         #point to the first row
 685                         iter = self._unitModel.get_iter_first()
 686
 687                         while iter:
 688                                 #get the formula from the name at the row
 689                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 690
 691                                 #set the result in the value column
 692                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 693
 694                                 #point to the next row in the self._unitModel
 695                                 iter = self._unitModel.iter_next(iter)
 696
 697                         # if the second row has a unit then update its value
 698                         if self._unitName.get_text() != '':
 699                                 self._calcsuppress = True
 700                                 func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 701                                 self._unitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 702                                 self._calcsuppress = False
 703
 704
 705 def main():
 706         logging.basicConfig(level = logging.DEBUG)
 707         try:
 708                 os.makedirs(constants._data_path_)
 709         except OSError, e:
 710                 if e.errno != 17:
 711                         raise
 712
 713         gonvert = Gonvert()
 714         gtk.main()
 715
 716
 717 if __name__ == "__main__":
 718         main()