src/ui/gui/psppire-selector.c

   1 /* PSPPIRE - a graphical user interface for PSPP.
   2    Copyright (C) 2007  Free Software Foundation
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
  16
  17 /*
  18   This module provides a widget, PsppireSelector derived from
  19   GtkButton.
  20
  21   It contains a GtkArrow, and is used for selecting objects from a
  22   GtkTreeView and putting them into a destination widget (often
  23   another GtkTreeView).  Typically this is used in psppire for
  24   selecting variables, thus:
  25
  26
  27   +----------------------------------------------------------+
  28   |                                                          |
  29   |     Source Widget                       Dest Widget      |
  30   |   +----------------+                 +----------------+  |
  31   |   | Variable0      |                 | Variable2      |  |
  32   |   | Variable1      |                 |                |  |
  33   |   | Variable3      |                 |                |  |
  34   |   |                |    Selector     |                |  |
  35   |   |                |                 |                |  |
  36   |   |                |    +------+     |                |  |
  37   |   |                |    | |\   |     |                |  |
  38   |   |                |    | | \  |     |                |  |
  39   |   |                |    | | /  |     |                |  |
  40   |   |                |    | |/   |     |                |  |
  41   |   |                |    +------+     |                |  |
  42   |   |                |                 |                |  |
  43   |   |                |                 |                |  |
  44   |   |                |                 |                |  |
  45   |   |                |                 |                |  |
  46   |   +----------------+                 +----------------+  |
  47   |                                                          |
  48   +----------------------------------------------------------+
  49
  50   The Source Widget is always a GtkTreeView.  The Dest Widget may be a
  51   GtkTreeView or a GtkEntry (other destination widgets may be
  52   supported in the future).
  53
  54   Widgets may be source to more than one PsppireSelector.
  55 */
  56
  57
  58 #include <config.h>
  59
  60 #include <gtk/gtksignal.h>
  61 #include <gtk/gtkbutton.h>
  62 #include <gtk/gtkentry.h>
  63
  64 #include "psppire-selector.h"
  65
  66 #include <gtk/gtktreeview.h>
  67 #include <gtk/gtktreeselection.h>
  68 #include <gtk/gtktextview.h>
  69 #include <gtk/gtkwidget.h>
  70
  71 static void psppire_selector_base_finalize (PsppireSelectorClass *, gpointer);
  72 static void psppire_selector_base_init     (PsppireSelectorClass *class);
  73 static void psppire_selector_class_init    (PsppireSelectorClass *class);
  74 static void psppire_selector_init          (PsppireSelector      *selector);
  75
  76
  77 static void set_direction (PsppireSelector *, enum psppire_selector_dir);
  78
  79
  80 enum  {SELECTED,    /* Emitted when an item is inserted into dest */
  81        DE_SELECTED, /* Emitted when an item is removed from dest */
  82        n_SIGNALS};
  83
  84 static guint signals [n_SIGNALS];
  85
  86
  87 GType
  88 psppire_selector_get_type (void)
  89 {
  90   static GType psppire_selector_type = 0;
  91
  92   if (!psppire_selector_type)
  93     {
  94       static const GTypeInfo psppire_selector_info =
  95       {
  96         sizeof (PsppireSelectorClass),
  97         (GBaseInitFunc) psppire_selector_base_init,
  98         (GBaseFinalizeFunc) psppire_selector_base_finalize,
  99         (GClassInitFunc)psppire_selector_class_init,
 100         (GClassFinalizeFunc) NULL,
 101         NULL,
 102         sizeof (PsppireSelector),
 103         0,
 104         (GInstanceInitFunc) psppire_selector_init,
 105       };
 106
 107       psppire_selector_type =
 108         g_type_register_static (GTK_TYPE_BUTTON, "PsppireSelector",
 109                                 &psppire_selector_info, 0);
 110     }
 111
 112   return psppire_selector_type;
 113 }
 114
 115
 116 static void
 117 psppire_selector_finalize (GObject *object)
 118 {
 119 }
 120
 121 /* Properties */
 122 enum
 123 {
 124   PROP_0,
 125   PROP_ORIENTATION
 126 };
 127
 128
 129 static void on_activate (PsppireSelector *selector, gpointer data);
 130
 131
 132 static void
 133 psppire_selector_set_property (GObject         *object,
 134                                guint            prop_id,
 135                                const GValue    *value,
 136                                GParamSpec      *pspec)
 137 {
 138   PsppireSelector *selector = PSPPIRE_SELECTOR (object);
 139
 140   switch (prop_id)
 141     {
 142     case PROP_ORIENTATION:
 143       selector->orientation = g_value_get_enum (value);
 144       set_direction (selector, selector->direction);
 145       break;
 146     default:
 147       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 148       break;
 149     };
 150 }
 151
 152
 153 static void
 154 psppire_selector_get_property (GObject         *object,
 155                                guint            prop_id,
 156                                GValue          *value,
 157                                GParamSpec      *pspec)
 158 {
 159   PsppireSelector *selector = PSPPIRE_SELECTOR (object);
 160
 161   switch (prop_id)
 162     {
 163     case PROP_ORIENTATION:
 164       g_value_set_enum (value, selector->orientation);
 165       break;
 166     default:
 167       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 168       break;
 169     };
 170 }
 171
 172
 173
 174 static void
 175 psppire_selector_class_init (PsppireSelectorClass *class)
 176 {
 177   GObjectClass *object_class = G_OBJECT_CLASS (class);
 178   GParamSpec *orientation_spec =
 179     g_param_spec_enum ("orientation",
 180                        "Orientation",
 181                        "Where the selector is relative to its subjects",
 182                        PSPPIRE_TYPE_SELECTOR_ORIENTATION,
 183                        PSPPIRE_SELECT_SOURCE_BEFORE_DEST /* default value */,
 184                        G_PARAM_CONSTRUCT_ONLY |G_PARAM_READWRITE);
 185
 186
 187   object_class->set_property = psppire_selector_set_property;
 188   object_class->get_property = psppire_selector_get_property;
 189
 190   g_object_class_install_property (object_class,
 191                                    PROP_ORIENTATION,
 192                                    orientation_spec);
 193
 194   signals [SELECTED] =
 195     g_signal_new ("selected",
 196                   G_TYPE_FROM_CLASS (class),
 197                   G_SIGNAL_RUN_FIRST,
 198                   0,
 199                   NULL, NULL,
 200                   g_cclosure_marshal_VOID__VOID,
 201                   G_TYPE_NONE,
 202                   0);
 203
 204   signals [DE_SELECTED] =
 205     g_signal_new ("de-selected",
 206                   G_TYPE_FROM_CLASS (class),
 207                   G_SIGNAL_RUN_FIRST,
 208                   0,
 209                   NULL, NULL,
 210                   g_cclosure_marshal_VOID__VOID,
 211                   G_TYPE_NONE,
 212                   0);
 213 }
 214
 215
 216 static void
 217 psppire_selector_base_init (PsppireSelectorClass *class)
 218 {
 219   GObjectClass *object_class = G_OBJECT_CLASS (class);
 220
 221   object_class->finalize = psppire_selector_finalize;
 222
 223   class->source_hash = g_hash_table_new (g_direct_hash, g_direct_equal);
 224 }
 225
 226
 227
 228 static void
 229 psppire_selector_base_finalize(PsppireSelectorClass *class,
 230                                 gpointer class_data)
 231 {
 232   g_hash_table_destroy (class->source_hash);
 233 }
 234
 235
 236
 237 static void
 238 psppire_selector_init (PsppireSelector *selector)
 239 {
 240   selector->arrow = gtk_arrow_new (GTK_ARROW_LEFT, GTK_SHADOW_NONE);
 241   selector->filtered_source = NULL;
 242
 243   selector->action = gtk_action_new ("select", NULL, NULL, "pspp-stock-select");
 244
 245   gtk_action_connect_proxy (selector->action, GTK_WIDGET (selector));
 246
 247   gtk_container_add (GTK_CONTAINER (selector), selector->arrow);
 248
 249   gtk_widget_show (selector->arrow);
 250
 251   g_signal_connect_swapped (selector->action, "activate", G_CALLBACK (on_activate), selector);
 252
 253   selector->selecting = FALSE;
 254 }
 255
 256
 257 GtkWidget*
 258 psppire_selector_new (void)
 259 {
 260   return GTK_WIDGET (g_object_new (psppire_selector_get_type (), NULL));
 261 }
 262
 263
 264 static void
 265 set_direction (PsppireSelector *selector, enum psppire_selector_dir d)
 266 {
 267   selector->direction = d;
 268
 269   /* FIXME: Need to reverse the arrow direction if an RTL locale is in
 270      effect */
 271   if ( d == PSPPIRE_SELECTOR_SOURCE_TO_DEST )
 272     {
 273       switch (selector->orientation)
 274         {
 275         case   PSPPIRE_SELECT_SOURCE_BEFORE_DEST:
 276           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_RIGHT, NULL);
 277           break;
 278         case   PSPPIRE_SELECT_SOURCE_AFTER_DEST:
 279           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_LEFT, NULL);
 280           break;
 281         case   PSPPIRE_SELECT_SOURCE_ABOVE_DEST:
 282           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_DOWN, NULL);
 283           break;
 284         case   PSPPIRE_SELECT_SOURCE_BELOW_DEST:
 285           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_UP, NULL);
 286           break;
 287         default:
 288           g_assert_not_reached ();
 289           break;
 290         };
 291     }
 292   else
 293     {
 294       switch (selector->orientation)
 295         {
 296         case   PSPPIRE_SELECT_SOURCE_BEFORE_DEST:
 297           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_LEFT, NULL);
 298           break;
 299         case   PSPPIRE_SELECT_SOURCE_AFTER_DEST:
 300           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_RIGHT, NULL);
 301           break;
 302         case   PSPPIRE_SELECT_SOURCE_ABOVE_DEST:
 303           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_UP, NULL);
 304           break;
 305         case   PSPPIRE_SELECT_SOURCE_BELOW_DEST:
 306           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_DOWN, NULL);
 307           break;
 308         default:
 309           g_assert_not_reached ();
 310           break;
 311         };
 312
 313     }
 314 }
 315
 316 /* Callback for when the source selection changes */
 317 static void
 318 on_source_select (GtkTreeSelection *treeselection, gpointer data)
 319 {
 320   PsppireSelector *selector = data;
 321
 322   set_direction (selector, PSPPIRE_SELECTOR_SOURCE_TO_DEST);
 323
 324   if ( selector->allow_selection )
 325     {
 326       gtk_action_set_sensitive (selector->action,
 327                                 selector->allow_selection (selector->source, selector->dest));
 328     }
 329   else if ( GTK_IS_ENTRY (selector->dest) )
 330     {
 331       gtk_action_set_sensitive (selector->action,
 332                                 gtk_tree_selection_count_selected_rows
 333                                 (treeselection) <= 1 );
 334     }
 335 }
 336
 337 /* Callback for when the destination treeview selection changes */
 338 static void
 339 on_dest_treeview_select (GtkTreeSelection *treeselection, gpointer data)
 340 {
 341   PsppireSelector *selector = data;
 342
 343   gtk_tree_selection_unselect_all (gtk_tree_view_get_selection (GTK_TREE_VIEW (selector->source)));
 344
 345   set_direction (selector, PSPPIRE_SELECTOR_DEST_TO_SOURCE);
 346 }
 347
 348 /* Callback for source deselection, when the dest is GtkEntry */
 349 static void
 350 de_select_selection_entry (PsppireSelector *selector)
 351 {
 352   gtk_entry_set_text (GTK_ENTRY (selector->dest), "");
 353 }
 354
 355 /* Callback for source deselection, when the dest is GtkTreeView */
 356 static void
 357 de_select_selection_tree_view (PsppireSelector *selector)
 358 {
 359   GList *item;
 360
 361   GtkTreeSelection* selection =
 362     gtk_tree_view_get_selection ( GTK_TREE_VIEW (selector->dest));
 363
 364   GtkTreeModel *model =
 365     gtk_tree_view_get_model (GTK_TREE_VIEW (selector->dest));
 366
 367   GList *selected_rows =
 368     gtk_tree_selection_get_selected_rows (selection, NULL);
 369
 370   g_return_if_fail (selector->select_items);
 371
 372   /* Convert paths to RowRefs */
 373   for (item = g_list_first (selected_rows);
 374        item != NULL;
 375        item = g_list_next (item))
 376     {
 377       GtkTreeRowReference* rowref;
 378       GtkTreePath *path  = item->data;
 379
 380       rowref = gtk_tree_row_reference_new (GTK_TREE_MODEL (model), path);
 381
 382       item->data = rowref ;
 383       gtk_tree_path_free (path);
 384     }
 385
 386   /* Remove each selected row from the dest widget */
 387   for (item = g_list_first (selected_rows);
 388        item != NULL;
 389        item = g_list_next (item))
 390     {
 391       GtkTreeIter iter;
 392       GtkTreeRowReference *rr = item->data;
 393
 394       GtkTreePath *path = gtk_tree_row_reference_get_path (rr);
 395
 396       gtk_tree_model_get_iter (GTK_TREE_MODEL (model), &iter, path);
 397
 398       gtk_list_store_remove (GTK_LIST_STORE (model), &iter);
 399
 400       gtk_tree_path_free (path);
 401     }
 402
 403   /* Delete list of RowRefs and its contents */
 404   g_list_foreach (selected_rows, (GFunc) gtk_tree_row_reference_free, NULL);
 405   g_list_free (selected_rows);
 406 }
 407
 408
 409 /* Removes something from the DEST widget */
 410 static void
 411 de_select_selection (PsppireSelector *selector)
 412 {
 413   selector->selecting = TRUE;
 414
 415   if ( GTK_IS_TREE_VIEW (selector->dest ) )
 416     de_select_selection_tree_view (selector);
 417
 418   else if ( GTK_IS_ENTRY (selector->dest))
 419     de_select_selection_entry (selector);
 420
 421   else
 422     g_assert_not_reached ();
 423
 424   selector->selecting = FALSE;
 425
 426   gtk_tree_model_filter_refilter (selector->filtered_source);
 427
 428   g_signal_emit (selector, signals [DE_SELECTED], 0);
 429 }
 430
 431
 432 /* Puts something into the DEST widget */
 433 static void
 434 select_selection (PsppireSelector *selector)
 435 {
 436   GList *item ;
 437   GtkTreeSelection* selection =
 438     gtk_tree_view_get_selection ( GTK_TREE_VIEW (selector->source));
 439
 440   GList *selected_rows =
 441     gtk_tree_selection_get_selected_rows (selection, NULL);
 442
 443   GtkTreeModel *childmodel  = gtk_tree_model_filter_get_model
 444     (selector->filtered_source);
 445
 446   g_return_if_fail (selector->select_items);
 447
 448   selector->selecting = TRUE;
 449
 450   for (item = g_list_first (selected_rows);
 451        item != NULL;
 452        item = g_list_next (item))
 453     {
 454       GtkTreeIter child_iter;
 455       GtkTreeIter iter;
 456       GtkTreePath *path  = item->data;
 457
 458       gtk_tree_model_get_iter (GTK_TREE_MODEL (selector->filtered_source),
 459                                &iter, path);
 460
 461       gtk_tree_model_filter_convert_iter_to_child_iter
 462         (selector->filtered_source,
 463          &child_iter,
 464          &iter);
 465
 466       selector->select_items (child_iter,
 467                               selector->dest,
 468                               childmodel,
 469                               selector->select_user_data
 470                               );
 471     }
 472
 473   g_list_foreach (selected_rows, (GFunc) gtk_tree_path_free, NULL);
 474   g_list_free (selected_rows);
 475
 476   gtk_tree_model_filter_refilter (selector->filtered_source);
 477
 478   g_signal_emit (selector, signals [SELECTED], 0);
 479
 480   selector->selecting = FALSE;
 481 }
 482
 483 /* Callback for when the source treeview is activated (double clicked) */
 484 static void
 485 on_row_activate (GtkTreeView       *tree_view,
 486                  GtkTreePath       *path,
 487                  GtkTreeViewColumn *column,
 488                  gpointer           data)
 489 {
 490   PsppireSelector *selector  = data;
 491
 492   gtk_action_activate (selector->action);
 493 }
 494
 495 /* Callback for when the selector button is clicked,
 496    or other event which causes the selector's action to occur.
 497  */
 498 static void
 499 on_activate (PsppireSelector *selector, gpointer data)
 500 {
 501   switch (selector->direction)
 502     {
 503     case PSPPIRE_SELECTOR_SOURCE_TO_DEST:
 504       select_selection (selector);
 505       break;
 506     case PSPPIRE_SELECTOR_DEST_TO_SOURCE:
 507       de_select_selection (selector);
 508       break;
 509     default:
 510       g_assert_not_reached ();
 511       break;
 512     }
 513 }
 514
 515 /* Default visibility filter for GtkTreeView DEST widget */
 516 static gboolean
 517 is_item_in_dest (GtkTreeModel *model, GtkTreeIter *iter,
 518                  PsppireSelector *selector)
 519 {
 520   GtkTreeModel *dest_model;
 521   GtkTreeIter dest_iter;
 522   GtkTreeIter source_iter;
 523   gint index;
 524   GtkTreePath *path ;
 525   GtkTreeModel *source_model;
 526
 527   if ( GTK_IS_TREE_MODEL_FILTER (model) )
 528     {
 529       source_model = gtk_tree_model_filter_get_model
 530         (GTK_TREE_MODEL_FILTER (model));
 531
 532       gtk_tree_model_filter_convert_iter_to_child_iter
 533         ( GTK_TREE_MODEL_FILTER (model),  &source_iter,  iter  );
 534     }
 535   else
 536     {
 537       source_model = model;
 538       source_iter = *iter;
 539     }
 540
 541   dest_model = gtk_tree_view_get_model (GTK_TREE_VIEW (selector->dest));
 542
 543   path = gtk_tree_model_get_path (source_model, &source_iter);
 544
 545   index = *gtk_tree_path_get_indices (path);
 546
 547   gtk_tree_path_free (path);
 548
 549   if ( ! gtk_tree_model_get_iter_first (dest_model, &dest_iter) )
 550     return FALSE;
 551
 552   do
 553     {
 554       int x;
 555       GValue value = {0};
 556       GValue int_value = {0};
 557       gtk_tree_model_get_value (dest_model, &dest_iter, 0, &value);
 558
 559       g_value_init (&int_value, G_TYPE_INT);
 560
 561       g_value_transform (&value, &int_value);
 562
 563       x = g_value_get_int (&int_value);
 564
 565       g_value_unset (&int_value);
 566       g_value_unset (&value);
 567
 568       if ( x == index )
 569         return TRUE;
 570     }
 571   while (gtk_tree_model_iter_next (dest_model, &dest_iter));
 572
 573   return FALSE;
 574 }
 575
 576 /* Visibility function for items in the SOURCE widget.
 577    Returns TRUE iff *all* the selectors for which SOURCE is associated
 578    are visible */
 579 static gboolean
 580 is_source_item_visible (GtkTreeModel *childmodel,
 581                         GtkTreeIter *iter, gpointer data)
 582 {
 583   PsppireSelector *selector = data;
 584   PsppireSelectorClass *class = g_type_class_peek (PSPPIRE_SELECTOR_TYPE);
 585
 586   GList *list = NULL;
 587
 588   list = g_hash_table_lookup (class->source_hash, selector->source);
 589
 590   while (list)
 591     {
 592       PsppireSelector *selector = list->data;
 593
 594       if ( selector->filter && selector->filter (childmodel, iter, selector))
 595         return FALSE;
 596
 597       list = list->next;
 598     }
 599
 600
 601   return TRUE;
 602 }
 603
 604 /* set the source widget to SOURCE */
 605 static void
 606 set_tree_view_source (PsppireSelector *selector,
 607                       GtkTreeView *source)
 608 {
 609   GtkTreeSelection* selection ;
 610   GList *list = NULL;
 611
 612   PsppireSelectorClass *class = g_type_class_peek (PSPPIRE_SELECTOR_TYPE);
 613
 614   if ( ! (list = g_hash_table_lookup (class->source_hash, source)))
 615     {
 616       selector->filtered_source =
 617         GTK_TREE_MODEL_FILTER (gtk_tree_model_filter_new
 618                                (gtk_tree_view_get_model (source),  NULL));
 619
 620       gtk_tree_view_set_model (source, NULL);
 621
 622       gtk_tree_view_set_model (source,
 623                                GTK_TREE_MODEL (selector->filtered_source));
 624
 625       list = g_list_append (list, selector);
 626       g_hash_table_insert (class->source_hash, source, list);
 627
 628
 629       gtk_tree_model_filter_set_visible_func (selector->filtered_source,
 630                                               is_source_item_visible,
 631                                               selector,
 632                                               NULL);
 633     }
 634   else
 635     {  /* Append this selector to the list and push the <source,list>
 636           pair onto the hash table */
 637
 638       selector->filtered_source = GTK_TREE_MODEL_FILTER (
 639         gtk_tree_view_get_model (source));
 640
 641       list = g_list_append (list, selector);
 642       g_hash_table_replace (class->source_hash, source, list);
 643     }
 644
 645   selection = gtk_tree_view_get_selection (source);
 646
 647   g_signal_connect (source, "row-activated", G_CALLBACK (on_row_activate),
 648                     selector);
 649
 650   g_signal_connect (selection, "changed", G_CALLBACK (on_source_select),
 651                     selector);
 652 }
 653
 654
 655 /*
 656    Callback for when the destination treeview's data changes
 657  */
 658 static void
 659 on_dest_data_change (GtkTreeModel *tree_model,
 660                      GtkTreePath  *path,
 661                      GtkTreeIter  *iter,
 662                      gpointer      user_data)
 663 {
 664   PsppireSelector *selector = user_data;
 665
 666   if ( selector->selecting) return;
 667
 668   gtk_tree_model_filter_refilter (selector->filtered_source);
 669 }
 670
 671
 672 static void
 673 on_dest_data_delete (GtkTreeModel *tree_model,
 674                      GtkTreePath  *path,
 675                      gpointer      user_data)
 676 {
 677   PsppireSelector *selector = user_data;
 678
 679   if ( selector->selecting ) return;
 680
 681   gtk_tree_model_filter_refilter (selector->filtered_source);
 682 }
 683
 684
 685
 686
 687 /* Set the destination widget to DEST */
 688 static void
 689 set_tree_view_dest (PsppireSelector *selector,
 690                     GtkTreeView *dest)
 691 {
 692   GtkTreeSelection* selection = gtk_tree_view_get_selection (dest);
 693   GtkTreeModel *model = gtk_tree_view_get_model (dest);
 694
 695   gtk_tree_selection_set_mode (selection, GTK_SELECTION_MULTIPLE);
 696
 697   g_signal_connect (selection, "changed", G_CALLBACK (on_dest_treeview_select),
 698                     selector);
 699
 700   g_signal_connect (model, "row-changed", G_CALLBACK (on_dest_data_change),
 701                       selector);
 702
 703   g_signal_connect (model, "row-deleted", G_CALLBACK (on_dest_data_delete),
 704                       selector);
 705
 706 }
 707
 708 /* Callback which causes the filter to be refiltered.
 709    Called when the DEST GtkEntry is activated (Enter is pressed), or when it
 710    looses focus.
 711 */
 712 static gboolean
 713 refilter (PsppireSelector *selector)
 714 {
 715   gtk_tree_model_filter_refilter (selector->filtered_source);
 716   return FALSE;
 717 }
 718
 719 /* Callback for when the DEST GtkEntry is selected (clicked) */
 720 static gboolean
 721 on_entry_dest_select (GtkWidget *widget, GdkEventFocus *event, gpointer data)
 722 {
 723   PsppireSelector * selector = data;
 724
 725   gtk_tree_selection_unselect_all (gtk_tree_view_get_selection (GTK_TREE_VIEW (selector->source)));
 726   set_direction (selector, PSPPIRE_SELECTOR_DEST_TO_SOURCE);
 727
 728   return FALSE;
 729 }
 730
 731
 732
 733 /* Callback for when an item disappears from the source list.
 734    By implication, this means that the item has been inserted into the
 735    destination.
 736  */
 737 static void
 738 on_row_deleted (PsppireSelector *selector)
 739 {
 740   g_signal_emit (selector, signals [SELECTED], 0);
 741 }
 742
 743 /* Callback for when a new item appears in the source list.
 744    By implication, this means that an item has been deleted from the
 745    destination.
 746  */
 747 static void
 748 on_row_inserted (PsppireSelector *selector)
 749 {
 750   g_signal_emit (selector, signals [DE_SELECTED], 0);
 751 }
 752
 753
 754
 755 /* Set DEST to be the destination GtkEntry widget */
 756 static void
 757 set_entry_dest (PsppireSelector *selector,
 758                 GtkEntry *dest)
 759 {
 760   g_signal_connect_swapped (dest, "activate", G_CALLBACK (refilter),
 761                     selector);
 762
 763   g_signal_connect_swapped (dest, "changed", G_CALLBACK (refilter),
 764                     selector);
 765
 766   g_signal_connect (dest, "focus-in-event", G_CALLBACK (on_entry_dest_select),
 767                     selector);
 768
 769   g_signal_connect_swapped (dest, "focus-out-event", G_CALLBACK (refilter),
 770                     selector);
 771
 772
 773   g_signal_connect_swapped (selector->filtered_source, "row-deleted",
 774                     G_CALLBACK (on_row_deleted), selector);
 775
 776   g_signal_connect_swapped (selector->filtered_source, "row-inserted",
 777                     G_CALLBACK (on_row_inserted), selector);
 778 }
 779
 780
 781 /* Set SOURCE and DEST for this selector, and
 782    set SELECT_FUNC and FILTER_FUNC */
 783 void
 784 psppire_selector_set_subjects (PsppireSelector *selector,
 785                                GtkWidget *source,
 786                                GtkWidget *dest,
 787                                SelectItemsFunc *select_func,
 788                                FilterItemsFunc *filter_func,
 789                                gpointer user_data)
 790 {
 791   g_assert(selector);
 792
 793   selector->filter = filter_func ;
 794
 795   selector->source = source;
 796   selector->dest = dest;
 797   selector->select_user_data = user_data;
 798
 799   if ( filter_func == NULL)
 800     {
 801       if  (GTK_IS_TREE_VIEW (dest))
 802         selector->filter = is_item_in_dest;
 803     }
 804
 805   if ( GTK_IS_TREE_VIEW (source))
 806     set_tree_view_source (selector, GTK_TREE_VIEW (source) );
 807   else
 808     g_error ("Unsupported source widget: %s", G_OBJECT_TYPE_NAME (source));
 809
 810   g_assert ( GTK_IS_TREE_MODEL_FILTER (selector->filtered_source));
 811
 812   if ( NULL == dest)
 813     ;
 814   else if  ( GTK_IS_TREE_VIEW (dest))
 815     set_tree_view_dest (selector, GTK_TREE_VIEW (dest));
 816
 817   else if ( GTK_IS_ENTRY (dest))
 818     set_entry_dest (selector, GTK_ENTRY (dest));
 819
 820   else if (GTK_IS_TEXT_VIEW (dest))
 821     {
 822       /* Nothing to be done */
 823     }
 824
 825   else
 826     g_error ("Unsupported destination widget: %s", G_OBJECT_TYPE_NAME (dest));
 827
 828   selector->select_items = select_func;
 829 }
 830
 831
 832
 833 void
 834 psppire_selector_set_allow        (PsppireSelector *selector , AllowSelectionFunc *allow)
 835 {
 836   selector->allow_selection = allow;
 837 }
 838
 839
 840
 841 GType
 842 psppire_selector_orientation_get_type (void)
 843 {
 844   static GType etype = 0;
 845   if (etype == 0) {
 846     static const GEnumValue values[] = {
 847       { PSPPIRE_SELECT_SOURCE_BEFORE_DEST, "PSPPIRE_SELECT_SOURCE_BEFORE_DEST", "source before destination" },
 848       { PSPPIRE_SELECT_SOURCE_AFTER_DEST, "PSPPIRE_SELECT_SOURCE_AFTER_DEST", "source after destination" },
 849       { PSPPIRE_SELECT_SOURCE_ABOVE_DEST, "PSPPIRE_SELECT_SOURCE_ABOVE_DEST", "source above destination" },
 850       { PSPPIRE_SELECT_SOURCE_BELOW_DEST, "PSPPIRE_SELECT_SOURCE_BELOW_DEST", "source below destination" },
 851       { 0, NULL, NULL }
 852     };
 853     etype = g_enum_register_static (g_intern_static_string ("PsppireSelectorOrientation"), values);
 854   }
 855   return etype;
 856 }