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
 100                 #insert a self._categoryColumnumn into the units list even though the heading will not be seen
 101                 renderer = gtk.CellRendererText()
 102                 self._unitNameColumn = gtk.TreeViewColumn(_('Unit Name'), renderer)
 103                 self._unitNameColumn.set_property('resizable', 1)
 104                 self._unitNameColumn.add_attribute(renderer, 'text', 0)
 105                 self._unitNameColumn.set_clickable(True)
 106                 self._unitNameColumn.connect("clicked", self._on_click_unit_column)
 107                 self._unitsView.append_column(self._unitNameColumn)
 108
 109                 self._unitValueColumn = gtk.TreeViewColumn(_('Value'), renderer)
 110                 self._unitValueColumn.set_property('resizable', 1)
 111                 self._unitValueColumn.add_attribute(renderer, 'text', 1)
 112                 self._unitValueColumn.set_clickable(True)
 113                 self._unitValueColumn.connect("clicked", self._on_click_unit_column)
 114                 self._unitsView.append_column(self._unitValueColumn)
 115
 116                 self._unitSymbolColumn = gtk.TreeViewColumn(_('Units'), renderer)
 117                 self._unitSymbolColumn.set_property('resizable', 1)
 118                 self._unitSymbolColumn.add_attribute(renderer, 'text', 2)
 119                 self._unitSymbolColumn.set_clickable(True)
 120                 self._unitSymbolColumn.connect("clicked", self._on_click_unit_column)
 121                 self._unitsView.append_column(self._unitSymbolColumn)
 122
 123                 #Insert a column into the category list even though the heading will not be seen
 124                 renderer = gtk.CellRendererText()
 125                 self._categoryColumn = gtk.TreeViewColumn('Title', renderer)
 126                 self._categoryColumn.set_property('resizable', 1)
 127                 self._categoryColumn.add_attribute(renderer, 'text', 0)
 128                 self._categoryView.append_column(self._categoryColumn)
 129
 130                 self._categoryModel = gtk.ListStore(gobject.TYPE_STRING)
 131                 self._categoryView.set_model(self._categoryModel)
 132                 #colourize each row differently for easier reading
 133                 self._categoryView.set_property('rules_hint', 1)
 134
 135                 #Populate the catagories list
 136                 keys = unit_data.list_dic.keys()
 137                 keys.sort()
 138                 for key in keys:
 139                         iter = self._categoryModel.append()
 140                         self._categoryModel.set(iter, 0, key)
 141
 142                 ToolTips = gtk.Tooltips()
 143                 ToolTips.set_tip(findButton, _(u'Find unit (F6)'))
 144
 145                 #--------- connections to GUI ----------------
 146                 dic = {
 147                         "on_exit_menu_activate": self._on_user_exit,
 148                         "on_main_window_destroy": self._on_user_exit,
 149                         "on_categoryView_select_row": self._on_click_category,
 150                         "on_unitsView__on_click_unit_column": self._on_click_unit_column,
 151                         "on_unitValue_changed": self.top,
 152                         "on_previousUnitValue_changed": self.bottom,
 153                         "on_writeUnitsMenuItem_activate": self._on_user_write_units,
 154                         "on_findButton_clicked": self._on_user_find_units,
 155                         "on_findEntry_key_press_event": self._on_find_key_press,
 156                         "on_findEntry_changed": self._findEntry_changed,
 157                         "on_aboutMenuItem_activate": self._on_about_clicked,
 158                         "on_messagebox_ok_clicked": self.messagebox_ok_clicked,
 159                         "on_clearSelectionMenuItem_activate": self._on_user_clear_selections,
 160                         "on_unitsView_cursor_changed": self._on_click_unit,
 161                         "on_unitsView_button_released": self._on_button_released,
 162                         "on_shortlistcheck_toggled": self._on_shortlist_changed,
 163                         "on_toggleShortList_activate": self._on_edit_shortlist,
 164                 }
 165                 widgets.signal_autoconnect(dic)
 166
 167                 self._mainWindow.set_title('gonvert- %s - Unit Conversion Utility' % constants.__version__)
 168                 iconPath = pixmapspath + '/gonvert.png'
 169                 if os.path.exists(iconPath):
 170                         self._mainWindow.set_icon(gtk.gdk.pixbuf_new_from_file(iconPath))
 171                 else:
 172                         _moduleLogger.warn("Error: Could not find gonvert icon: %s" % iconPath)
 173
 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                         #
 200                         #Make a list of categories to determine which one to select
 201                         categories = unit_data.list_dic.keys()
 202                         categories.sort()
 203                         #
 204                         #If the 'selected_unts' has been stored, then extract self._selected_units from selections.
 205                         if 'selected_units' in selections:
 206                                 self._selected_units = selections['selected_units']
 207                         #Make sure that the 'self._selected_category' has been stored.
 208                         if 'selected_category' in selections:
 209                                 #Match an available category to the previously selected category.
 210                                 for counter in range(len(categories)):
 211                                         if selections['selected_category'] == categories[counter]:
 212                                                 # Restore the previously selected category.
 213                                                 self._categoryView.set_cursor(counter, self._categoryColumn, False)
 214                                                 self._categoryView.grab_focus()
 215                                 historical_catergory_found = True
 216
 217                 if not historical_catergory_found:
 218                         print "Couldn't find saved category, using default."
 219                         #If historical records were not kept then default to
 220                         # put the focus on the first category
 221                         self._categoryView.set_cursor(0, self._categoryColumn, False)
 222                         self._categoryView.grab_focus()
 223
 224                 self.restore_units()
 225
 226         def _on_shortlist_changed(self, a):
 227                 print "shortlist"
 228                 if self._shortlistcheck.get_active():
 229                         print "1"
 230                 else:
 231                         print "0"
 232
 233         def _on_edit_shortlist(self, a):
 234                 print "edit shortlist"
 235                 if self._toggleShortList.get_active():
 236                         print "1"
 237                 else:
 238                         print "0"
 239
 240         def _on_user_clear_selections(self, a):
 241                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 242                 os.remove(selectionsDatPath)
 243                 self._selected_units = {}
 244
 245         def _on_user_exit(self, a):
 246                 """
 247                 This routine saves the selections to a file, and
 248                 should therefore only be called when exiting the program.
 249
 250                 Update selections dictionary which consists of the following keys:
 251                 'self._selected_category': full name of selected category
 252                 'self._selected_units': self._selected_units dictionary which contains:
 253                 [categoryname: #1 displayed unit, #2 displayed unit]
 254                 """
 255                 #Determine the contents of the selected category row
 256                 selected, iter = self._categoryView.get_selection().get_selected()
 257                 self._selected_category = self._categoryModel.get_value(iter, 0)
 258
 259                 selections = {
 260                         'selected_category': self._selected_category,
 261                         'selected_units': self._selected_units
 262                 }
 263                 selectionsDatPath = "/".join((constants._data_path_, "selections.dat"))
 264                 pickle.dump(selections, open(selectionsDatPath, 'w'))
 265
 266                 #Get last size of app and save it
 267                 window_settings = {
 268                         'size': self._mainWindow.get_size()
 269                 }
 270                 windowDatPath = "/".join((constants._data_path_, "window.dat"))
 271                 pickle.dump(window_settings, open(windowDatPath, 'w'))
 272
 273                 gtk.mainquit
 274                 sys.exit()
 275
 276         def _findEntry_changed(self, a):
 277                 #Clear out find results since the user wants to look for something new
 278                 self._find_result = [] #empty find result list
 279                 self._find_count = 0 #default to find result number zero
 280                 self._findLabel.set_text('') #clear result
 281
 282         def _on_find_key_press(self, a, b):
 283                 #Check if the key pressed was an ASCII key
 284                 if len(b.string)>0:
 285                         #Check if the key pressed was the 'Enter' key
 286                         if ord(b.string[0]) == 13:
 287                                 #Execute the find units function
 288                                 self._on_user_find_units(1)
 289
 290         def _on_about_clicked(self, a):
 291                 dlg = gtk.AboutDialog()
 292                 dlg.set_name(constants.__pretty_app_name__)
 293                 dlg.set_version("%s-%d" % (constants.__version__, constants.__build__))
 294                 dlg.set_copyright("Copyright 2009 - GPL")
 295                 dlg.set_comments("")
 296                 dlg.set_website("http://unihedron.com/projects/gonvert/gonvert.php")
 297                 dlg.set_authors(["Anthony Tekatch <anthony@unihedron.com>", "Ed Page <edpage@byu.net>"])
 298                 dlg.run()
 299                 dlg.destroy()
 300
 301         def messagebox_ok_clicked(self, a):
 302                 messagebox.hide()
 303
 304         def _on_user_find_units(self, a):
 305                 #check if 'new find' or 'last find' or 'next-find'
 306
 307                 #new-find = run the find algorithm which also selects the first found unit
 308                 #         = self._find_count = 0 and self._find_result = []
 309
 310                 #last-find = restart from top again
 311                 #          = self._find_count = len(self._find_result)
 312
 313                 #next-find = continue to next found location
 314                 #           = self._find_count = 0 and len(self._find_result)>0
 315
 316                 #check for new-find
 317                 if len(self._find_result) == 0:
 318                         find_string = string.lower(string.strip(self._findEntry.get_text()))
 319                         #Make sure that a valid find string has been requested
 320                         if len(find_string)>0:
 321                                 categories = unit_data.list_dic.keys()
 322                                 categories.sort()
 323                                 found_a_unit = 0 #reset the 'found-a-unit' flag
 324                                 cat_no = 0
 325                                 for category in categories:
 326                                         units = unit_data.list_dic[category].keys()
 327                                         units.sort()
 328                                         del units[0] # do not display .base_unit description key
 329                                         unit_no = 0
 330                                         for unit in units:
 331                                                 if string.find(string.lower(unit), find_string) >= 0:
 332                                                         found_a_unit = 1 #indicate that a unit was found
 333                                                         #print "'", find_string, "'", " found at category = ", category, " unit = ", unit
 334                                                         self._find_result.append((category, unit, cat_no, unit_no))
 335                                                 unit_no = unit_no+1
 336                                         cat_no = cat_no+1
 337
 338                                 if found_a_unit == 1:
 339                                         #select the first found unit
 340                                         self._find_count = 0
 341                                         #check if next find is in a new category (prevent category changes when unnecessary
 342                                         if self._selected_category != self._find_result[self._find_count][0]:
 343                                                 self._categoryView.set_cursor(self._find_result[0][2], self._categoryColumn, False)
 344                                                 self._unitsView.set_cursor(self._find_result[0][3], self._unitNameColumn, True)
 345                                                 if len(self._find_result)>1:
 346                                                         self._findLabel.set_text(('Press Find for next unit. '+ str(len(self._find_result))+' result(s).'))
 347                                                 else:
 348                                                         self._findLabel.set_text('Text not found') #Display error
 349                 else: #must be next-find or last-find
 350                         #check for last-find
 351                         if self._find_count == len(self._find_result)-1:
 352                                 #select first result
 353                                 self._find_count = 0
 354                                 self._categoryView.set_cursor(self._find_result[self._find_count][2], self._categoryColumn, False)
 355                                 self._unitsView.set_cursor(self._find_result[self._find_count][3], self._unitNameColumn, True)
 356                         else: #must be next-find
 357                                 self._find_count = self._find_count+1
 358                                 #check if next find is in a new category (prevent category changes when unnecessary
 359                                 if self._selected_category != self._find_result[self._find_count][0]:
 360                                         self._categoryView.set_cursor(self._find_result[self._find_count][2], self._categoryColumn, False)
 361                                 self._unitsView.set_cursor(self._find_result[self._find_count][3], self._unitNameColumn, True)
 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 unit_model.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.list_dic[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                                 ''"debug ''"
 527                                 #self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
 528
 529                                 units = unit_data.list_dic[self._selected_category].keys()
 530                                 units.sort()
 531                                 del units[0] # do not display .base_unit description key
 532
 533                                 #Restore oldest selection first.
 534                                 if self._selected_units[self._selected_category][1]:
 535                                         unit_no = 0
 536                                         for unit in units:
 537                                                 if unit == self._selected_units[self._selected_category][1]:
 538                                                         self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
 539                                                 unit_no = unit_no+1
 540
 541                                 #Restore newest selection second.
 542                                 unit_no = 0
 543                                 for unit in units:
 544                                         if unit == self._selected_units[self._selected_category][0]:
 545                                                 self._unitsView.set_cursor(unit_no, self._unitNameColumn, True)
 546                                         unit_no = unit_no+1
 547
 548                 # select the text so user can start typing right away
 549                 self._unitValue.grab_focus()
 550                 self._unitValue.select_region(0, -1)
 551
 552         def _on_button_released(self, row, a):
 553                 self._on_click_unit(row)
 554
 555         def _on_click_unit(self, row):
 556                 self._calcsuppress = True #suppress calculations
 557
 558                 #Determine the contents of the selected row.
 559                 selected, iter = self._unitsView.get_selection().get_selected()
 560
 561                 selected_unit = selected.get_value(iter, 0)
 562
 563                 unit_spec = self._unitDataInCategory[selected_unit]
 564
 565                 #Clear out the description
 566                 text_model = gtk.TextBuffer(None)
 567                 self._unitDescription.set_buffer(text_model)
 568
 569                 enditer = text_model.get_end_iter()
 570                 text_model.insert(enditer, unit_spec[2])
 571
 572                 if self._unitName.get_text() != selected_unit:
 573                         self._previousUnitName.set_text(self._unitName.get_text())
 574                         self._previousUnitValue.set_text(self._unitValue.get_text())
 575                         if self._unitSymbol.get() == None:
 576                                 self._previousUnitSymbol.set_text('')
 577                         else:
 578                                 self._previousUnitSymbol.set_text(self._unitSymbol.get())
 579                 self._unitName.set_text(selected_unit)
 580
 581                 self._unitValue.set_text(selected.get_value(iter, 1))
 582
 583                 self._unitSymbol.set_text(unit_spec[1]) # put units into label text
 584                 if self._unitValue.get_text() == '':
 585                         if self._selected_category == "Computer Numbers":
 586                                 self._unitValue.set_text("0")
 587                         else:
 588                                 self._unitValue.set_text("0.0")
 589
 590                 #For historical purposes, record this unit as the most recent one in this category.
 591                 # Also, if a previous unit exists, then shift that previous unit to oldest unit.
 592                 if self._selected_category in self._selected_units:
 593                         if self._selected_units[self._selected_category][0]:
 594                                 self._selected_units[self._selected_category] = [selected_unit, self._selected_units[self._selected_category][0]]
 595                 else:
 596                         self._selected_units[self._selected_category] = [selected_unit, '']
 597
 598                 # select the text so user can start typing right away
 599                 self._unitValue.grab_focus()
 600                 self._unitValue.select_region(0, -1)
 601
 602                 self._calcsuppress = False #enable calculations
 603
 604         def _on_user_write_units(self, a):
 605                 ''"Write the list of categories and units to stdout for documentation purposes.''"
 606                 messagebox_model = gtk.TextBuffer(None)
 607                 messageboxtext.set_buffer(messagebox_model)
 608                 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)
 609                 messagebox.show()
 610                 while gtk.events_pending():
 611                         gtk.mainiteration(False)
 612                 category_keys = unit_data.list_dic.keys()
 613                 category_keys.sort()
 614                 total_categories = 0
 615                 total_units = 0
 616                 print 'gonvert-%s%s' % (
 617                         constants.__version__,
 618                         _(u' - Unit Conversion Utility  - Convertible units listing: ')
 619                 )
 620                 for category_key in category_keys:
 621                         total_categories = total_categories + 1
 622                         print category_key, ": "
 623                         self._unitDataInCategory = unit_data.list_dic[category_key]
 624                         unit_keys = self._unitDataInCategory.keys()
 625                         unit_keys.sort()
 626                         del unit_keys[0] # do not display .base_unit description key
 627                         for unit_key in unit_keys:
 628                                 total_units = total_units + 1
 629                                 print "\t", unit_key
 630                 print total_categories, ' categories'
 631                 print total_units, ' units'
 632                 messagebox_model = gtk.TextBuffer(None)
 633                 messageboxtext.set_buffer(messagebox_model)
 634                 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)
 635
 636         def top(self, a):
 637                 if self._calcsuppress:
 638                         #self._calcsuppress = False
 639                         return
 640                 # determine if value to be calculated is empty
 641                 if self._selected_category == "Computer Numbers":
 642                         if self._unitValue.get_text() == '':
 643                                 value = '0'
 644                         else:
 645                                 value = self._unitValue.get_text()
 646                 else:
 647                         if self._unitValue.get_text() == '':
 648                                 value = 0.0
 649                         else:
 650                                 value = float(self._unitValue.get_text())
 651
 652                 if self._unitName.get_text() != '':
 653                         func, arg = self._unitDataInCategory[self._unitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 654                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 655
 656                         keys = self._unitDataInCategory.keys()
 657                         keys.sort()
 658                         del keys[0]
 659                         row = 0
 660
 661                         #point to the first row
 662                         iter = self._unitModel.get_iter_first()
 663
 664                         while iter:
 665                                 #get the formula from the name at the row
 666                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 667
 668                                 #set the result in the value column
 669                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 670
 671                                 #point to the next row in the self._unitModel
 672                                 iter = self._unitModel.iter_next(iter)
 673
 674                         # if the second row has a unit then update its value
 675                         if self._previousUnitName.get_text() != '':
 676                                 self._calcsuppress = True
 677                                 func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0]
 678                                 self._previousUnitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 679                                 self._calcsuppress = False
 680
 681         def bottom(self, a):
 682                 if self._calcsuppress == True:
 683                         #self._calcsuppress = False
 684                         return
 685                 # determine if value to be calculated is empty
 686                 if self._selected_category == "Computer Numbers":
 687                         if self._previousUnitValue.get_text() == '':
 688                                 value = '0'
 689                         else:
 690                                 value = self._previousUnitValue.get_text()
 691                 else:
 692                         if self._previousUnitValue.get_text() == '':
 693                                 value = 0.0
 694                         else:
 695                                 value = float(self._previousUnitValue.get_text())
 696
 697                 if self._previousUnitName.get_text() != '':
 698                         func, arg = self._unitDataInCategory[self._previousUnitName.get_text()][0] #retrieve the conversion function and value from the selected unit
 699                         base = apply(func.to_base, (value, arg, )) #determine the base unit value
 700
 701                         keys = self._unitDataInCategory.keys()
 702                         keys.sort()
 703                         del keys[0]
 704                         row = 0
 705
 706                         #point to the first row
 707                         iter = self._unitModel.get_iter_first()
 708
 709                         while iter:
 710                                 #get the formula from the name at the row
 711                                 func, arg = self._unitDataInCategory[self._unitModel.get_value(iter, 0)][0]
 712
 713                                 #set the result in the value column
 714                                 self._unitModel.set(iter, 1, str(apply(func.from_base, (base, arg, ))))
 715
 716                                 #point to the next row in the self._unitModel
 717                                 iter = self._unitModel.iter_next(iter)
 718
 719                         # if the second row has a unit then update its value
 720                         if self._unitName.get_text() != '':
 721                                 self._calcsuppress = True
 722                                 func, arg = self._unitDataInCategory[self._unitName.get_text()][0]
 723                                 self._unitValue.set_text(str(apply(func.from_base, (base, arg, ))))
 724                                 self._calcsuppress = False
 725
 726
 727 def main():
 728         logging.basicConfig(level = logging.DEBUG)
 729         try:
 730                 os.makedirs(constants._data_path_)
 731         except OSError, e:
 732                 if e.errno != 17:
 733                         raise
 734
 735         gonvert = Gonvert()
 736         gtk.main()
 737
 738
 739 if __name__ == "__main__":
 740         main()