src/ui/gui/psppire-selector.c

   1 /* PSPPIRE - a graphical user interface for PSPP.
   2    Copyright (C) 2007, 2009 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 /*
  19   This module provides a widget, PsppireSelector derived from
  20   GtkButton.
  21
  22   It contains a GtkArrow, and is used for selecting objects from a
  23   GtkTreeView and putting them into a destination widget (often
  24   another GtkTreeView).  Typically this is used in psppire for
  25   selecting variables, thus:
  26
  27
  28   +----------------------------------------------------------+
  29   |                                                          |
  30   |     Source Widget                       Dest Widget      |
  31   |   +----------------+                 +----------------+  |
  32   |   | Variable0      |                 | Variable2      |  |
  33   |   | Variable1      |                 |                |  |
  34   |   | Variable3      |                 |                |  |
  35   |   |                |    Selector     |                |  |
  36   |   |                |                 |                |  |
  37   |   |                |    +------+     |                |  |
  38   |   |                |    | |\   |     |                |  |
  39   |   |                |    | | \  |     |                |  |
  40   |   |                |    | | /  |     |                |  |
  41   |   |                |    | |/   |     |                |  |
  42   |   |                |    +------+     |                |  |
  43   |   |                |                 |                |  |
  44   |   |                |                 |                |  |
  45   |   |                |                 |                |  |
  46   |   |                |                 |                |  |
  47   |   +----------------+                 +----------------+  |
  48   |                                                          |
  49   +----------------------------------------------------------+
  50
  51   The Source Widget is always a GtkTreeView.  The Dest Widget may be a
  52   GtkTreeView or a GtkEntry (other destination widgets may be
  53   supported in the future).
  54
  55   Widgets may be source to more than one PsppireSelector.
  56 */
  57
  58
  59 #include <config.h>
  60
  61 #include "psppire-dictview.h"
  62 #include "psppire-var-view.h"
  63
  64
  65
  66 #include <gtk/gtksignal.h>
  67 #include <gtk/gtkbutton.h>
  68 #include <gtk/gtkentry.h>
  69
  70 #include "psppire-selector.h"
  71
  72 #include <gtk/gtktreeview.h>
  73 #include <gtk/gtktreeselection.h>
  74 #include <gtk/gtktextview.h>
  75 #include <gtk/gtkwidget.h>
  76
  77 static void psppire_selector_base_finalize (PsppireSelectorClass *, gpointer);
  78 static void psppire_selector_base_init     (PsppireSelectorClass *class);
  79 static void psppire_selector_class_init    (PsppireSelectorClass *class);
  80 static void psppire_selector_init          (PsppireSelector      *selector);
  81
  82
  83 static void set_direction (PsppireSelector *, enum psppire_selector_dir);
  84
  85
  86 enum  {SELECTED,    /* Emitted when an item is inserted into dest */
  87        DE_SELECTED, /* Emitted when an item is removed from dest */
  88        n_SIGNALS};
  89
  90 static guint signals [n_SIGNALS];
  91
  92
  93 GType
  94 psppire_selector_get_type (void)
  95 {
  96   static GType psppire_selector_type = 0;
  97
  98   if (!psppire_selector_type)
  99     {
 100       static const GTypeInfo psppire_selector_info =
 101       {
 102         sizeof (PsppireSelectorClass),
 103         (GBaseInitFunc) psppire_selector_base_init,
 104         (GBaseFinalizeFunc) psppire_selector_base_finalize,
 105         (GClassInitFunc)psppire_selector_class_init,
 106         (GClassFinalizeFunc) NULL,
 107         NULL,
 108         sizeof (PsppireSelector),
 109         0,
 110         (GInstanceInitFunc) psppire_selector_init,
 111       };
 112
 113       psppire_selector_type =
 114         g_type_register_static (GTK_TYPE_BUTTON, "PsppireSelector",
 115                                 &psppire_selector_info, 0);
 116     }
 117
 118   return psppire_selector_type;
 119 }
 120
 121 static GObjectClass * parent_class = NULL;
 122
 123 static void
 124 psppire_selector_finalize (GObject *obj)
 125 {
 126    /* Chain up to the parent class */
 127    G_OBJECT_CLASS (parent_class)->finalize (obj);
 128 }
 129
 130
 131 static void
 132 psppire_selector_dispose (GObject *obj)
 133 {
 134   PsppireSelector *sel = PSPPIRE_SELECTOR (obj);
 135
 136   if (sel->dispose_has_run)
 137     return;
 138
 139   /* Make sure dispose does not run twice. */
 140   sel->dispose_has_run = TRUE;
 141
 142   g_object_unref (sel->dest);
 143   g_object_unref (sel->source);
 144
 145   /* Chain up to the parent class */
 146   G_OBJECT_CLASS (parent_class)->dispose (obj);
 147 }
 148
 149
 150 /* Properties */
 151 enum
 152 {
 153   PROP_0,
 154   PROP_ORIENTATION,
 155   PROP_PRIMARY,
 156   PROP_SOURCE_WIDGET,
 157   PROP_DEST_WIDGET
 158 };
 159
 160
 161 static void on_activate (PsppireSelector *selector, gpointer data);
 162
 163 static void update_subjects (PsppireSelector *selector);
 164
 165
 166 static void
 167 psppire_selector_set_property (GObject         *object,
 168                                guint            prop_id,
 169                                const GValue    *value,
 170                                GParamSpec      *pspec)
 171 {
 172   PsppireSelector *selector = PSPPIRE_SELECTOR (object);
 173
 174   switch (prop_id)
 175     {
 176     case PROP_ORIENTATION:
 177       selector->orientation = g_value_get_enum (value);
 178       set_direction (selector, selector->direction);
 179       break;
 180     case PROP_PRIMARY:
 181       selector->primary_requested = TRUE;
 182       update_subjects (selector);
 183       break;
 184     case PROP_SOURCE_WIDGET:
 185       selector->source = g_value_dup_object (value);
 186       update_subjects (selector);
 187       break;
 188     case PROP_DEST_WIDGET:
 189       selector->dest = g_value_dup_object (value);
 190       update_subjects (selector);
 191       break;
 192     default:
 193       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 194       break;
 195     };
 196 }
 197
 198
 199 static void
 200 psppire_selector_get_property (GObject         *object,
 201                                guint            prop_id,
 202                                GValue          *value,
 203                                GParamSpec      *pspec)
 204 {
 205   PsppireSelector *selector = PSPPIRE_SELECTOR (object);
 206
 207   switch (prop_id)
 208     {
 209     case PROP_ORIENTATION:
 210       g_value_set_enum (value, selector->orientation);
 211       break;
 212     case PROP_SOURCE_WIDGET:
 213       g_value_take_object (value, selector->source);
 214       break;
 215     case PROP_DEST_WIDGET:
 216       g_value_take_object (value, selector->dest);
 217       break;
 218     default:
 219       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 220       break;
 221     };
 222 }
 223
 224 static void
 225 psppire_selector_class_init (PsppireSelectorClass *class)
 226 {
 227   GObjectClass *object_class = G_OBJECT_CLASS (class);
 228   GParamSpec *orientation_spec =
 229     g_param_spec_enum ("orientation",
 230                        "Orientation",
 231                        "Where the selector is relative to its subjects",
 232                        PSPPIRE_TYPE_SELECTOR_ORIENTATION,
 233                        PSPPIRE_SELECT_SOURCE_BEFORE_DEST /* default value */,
 234                        G_PARAM_CONSTRUCT_ONLY |G_PARAM_READWRITE);
 235
 236
 237  /* Meaningfull only if more than one selector shares this selectors source */
 238   GParamSpec *primary_spec =
 239     g_param_spec_boolean ("primary",
 240                           "Primary",
 241                           "Whether this selector should be the primary selector for the source",
 242                           FALSE,
 243                           G_PARAM_READWRITE);
 244
 245   GParamSpec *source_widget_spec =
 246     g_param_spec_object ("source-widget",
 247                          "Source Widget",
 248                          "The widget to be used as the source for this selector",
 249                          GTK_TYPE_WIDGET,
 250                          G_PARAM_READWRITE);
 251
 252   GParamSpec *dest_widget_spec =
 253     g_param_spec_object ("dest-widget",
 254                          "Destination Widget",
 255                          "The widget to be used as the destination for this selector",
 256                          GTK_TYPE_WIDGET,
 257                          G_PARAM_READWRITE);
 258
 259
 260   object_class->set_property = psppire_selector_set_property;
 261   object_class->get_property = psppire_selector_get_property;
 262
 263   g_object_class_install_property (object_class,
 264                                    PROP_ORIENTATION,
 265                                    orientation_spec);
 266
 267   g_object_class_install_property (object_class,
 268                                    PROP_PRIMARY,
 269                                    primary_spec);
 270
 271   g_object_class_install_property (object_class,
 272                                    PROP_SOURCE_WIDGET,
 273                                    source_widget_spec);
 274
 275   g_object_class_install_property (object_class,
 276                                    PROP_DEST_WIDGET,
 277                                    dest_widget_spec);
 278
 279   parent_class = g_type_class_peek_parent (class);
 280
 281   signals [SELECTED] =
 282     g_signal_new ("selected",
 283                   G_TYPE_FROM_CLASS (class),
 284                   G_SIGNAL_RUN_FIRST,
 285                   0,
 286                   NULL, NULL,
 287                   g_cclosure_marshal_VOID__VOID,
 288                   G_TYPE_NONE,
 289                   0);
 290
 291   signals [DE_SELECTED] =
 292     g_signal_new ("de-selected",
 293                   G_TYPE_FROM_CLASS (class),
 294                   G_SIGNAL_RUN_FIRST,
 295                   0,
 296                   NULL, NULL,
 297                   g_cclosure_marshal_VOID__VOID,
 298                   G_TYPE_NONE,
 299                   0);
 300
 301   class->default_selection_funcs = g_hash_table_new (g_direct_hash, g_direct_equal);
 302 }
 303
 304
 305 static void
 306 psppire_selector_base_init (PsppireSelectorClass *class)
 307 {
 308   GObjectClass *object_class = G_OBJECT_CLASS (class);
 309
 310   object_class->finalize = psppire_selector_finalize;
 311   object_class->dispose = psppire_selector_dispose;
 312
 313   class->source_hash = g_hash_table_new (g_direct_hash, g_direct_equal);
 314 }
 315
 316
 317
 318 static void
 319 psppire_selector_base_finalize(PsppireSelectorClass *class,
 320                                 gpointer class_data)
 321 {
 322   g_hash_table_destroy (class->source_hash);
 323   g_hash_table_destroy (class->default_selection_funcs);
 324 }
 325
 326 /* Callback for when the source treeview is activated (double clicked) */
 327 static void
 328 on_row_activate (GtkTreeView       *tree_view,
 329                  GtkTreePath       *path,
 330                  GtkTreeViewColumn *column,
 331                  gpointer           data)
 332 {
 333   PsppireSelector *selector  = data;
 334
 335   gtk_action_activate (selector->action);
 336 }
 337
 338 /* Callback for when the source selection changes */
 339 static void
 340 on_source_select (GtkTreeSelection *treeselection, gpointer data)
 341 {
 342   PsppireSelector *selector = data;
 343
 344   set_direction (selector, PSPPIRE_SELECTOR_SOURCE_TO_DEST);
 345
 346   if ( selector->allow_selection )
 347     {
 348       gtk_action_set_sensitive (selector->action,
 349                                 selector->allow_selection (selector->source, selector->dest));
 350     }
 351   else if ( GTK_IS_ENTRY (selector->dest) )
 352     {
 353       gtk_action_set_sensitive (selector->action,
 354                                 gtk_tree_selection_count_selected_rows
 355                                 (treeselection) <= 1 );
 356     }
 357 }
 358
 359
 360 static void
 361 on_realize (PsppireSelector *selector)
 362 {
 363   PsppireSelectorClass *class = g_type_class_peek (PSPPIRE_SELECTOR_TYPE);
 364   GtkTreeSelection* selection ;
 365
 366   GList *list = g_hash_table_lookup (class->source_hash, selector->source);
 367
 368   if ( NULL == list)
 369     return;
 370
 371   if ( g_list_first (list)->data == selector)
 372     {
 373       if ( selector->row_activate_id )
 374         g_signal_handler_disconnect (selector->source, selector->row_activate_id);
 375
 376       selector->row_activate_id =
 377         g_signal_connect (selector->source, "row-activated", G_CALLBACK (on_row_activate), selector);
 378     }
 379
 380   selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (selector->source));
 381
 382   if ( selector->source_select_id )
 383     g_signal_handler_disconnect (selection, selector->source_select_id);
 384
 385   selector->source_select_id =
 386     g_signal_connect (selection, "changed", G_CALLBACK (on_source_select), selector);
 387 }
 388
 389
 390 static void
 391 psppire_selector_init (PsppireSelector *selector)
 392 {
 393   selector->primary_requested = FALSE;
 394   selector->select_user_data = NULL;
 395   selector->select_items = NULL;
 396   selector->allow_selection = NULL;
 397   selector->filter = NULL;
 398
 399   selector->arrow = gtk_arrow_new (GTK_ARROW_LEFT, GTK_SHADOW_NONE);
 400   selector->filtered_source = NULL;
 401
 402   selector->action = gtk_action_new ("select", NULL, NULL, "pspp-stock-select");
 403
 404   gtk_action_connect_proxy (selector->action, GTK_WIDGET (selector));
 405
 406   gtk_container_add (GTK_CONTAINER (selector), selector->arrow);
 407
 408   gtk_widget_show (selector->arrow);
 409
 410   g_signal_connect_swapped (selector->action, "activate", G_CALLBACK (on_activate), selector);
 411
 412   selector->selecting = FALSE;
 413
 414   selector->source = NULL;
 415   selector->dest = NULL;
 416   selector->dispose_has_run = FALSE;
 417
 418
 419   selector->row_activate_id = 0;
 420   selector->source_select_id  = 0;
 421
 422   g_signal_connect (selector, "realize",
 423                     G_CALLBACK (on_realize), NULL);
 424
 425 }
 426
 427
 428 GtkWidget*
 429 psppire_selector_new (void)
 430 {
 431   return GTK_WIDGET (g_object_new (psppire_selector_get_type (), NULL));
 432 }
 433
 434
 435 static void
 436 set_direction (PsppireSelector *selector, enum psppire_selector_dir d)
 437 {
 438   selector->direction = d;
 439
 440   /* FIXME: Need to reverse the arrow direction if an RTL locale is in
 441      effect */
 442   if ( d == PSPPIRE_SELECTOR_SOURCE_TO_DEST )
 443     {
 444       switch (selector->orientation)
 445         {
 446         case   PSPPIRE_SELECT_SOURCE_BEFORE_DEST:
 447           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_RIGHT, NULL);
 448           break;
 449         case   PSPPIRE_SELECT_SOURCE_AFTER_DEST:
 450           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_LEFT, NULL);
 451           break;
 452         case   PSPPIRE_SELECT_SOURCE_ABOVE_DEST:
 453           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_DOWN, NULL);
 454           break;
 455         case   PSPPIRE_SELECT_SOURCE_BELOW_DEST:
 456           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_UP, NULL);
 457           break;
 458         default:
 459           g_assert_not_reached ();
 460           break;
 461         };
 462     }
 463   else
 464     {
 465       switch (selector->orientation)
 466         {
 467         case   PSPPIRE_SELECT_SOURCE_BEFORE_DEST:
 468           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_LEFT, NULL);
 469           break;
 470         case   PSPPIRE_SELECT_SOURCE_AFTER_DEST:
 471           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_RIGHT, NULL);
 472           break;
 473         case   PSPPIRE_SELECT_SOURCE_ABOVE_DEST:
 474           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_UP, NULL);
 475           break;
 476         case   PSPPIRE_SELECT_SOURCE_BELOW_DEST:
 477           g_object_set (selector->arrow, "arrow-type", GTK_ARROW_DOWN, NULL);
 478           break;
 479         default:
 480           g_assert_not_reached ();
 481           break;
 482         };
 483
 484     }
 485 }
 486
 487 /* Callback for when the destination treeview selection changes */
 488 static void
 489 on_dest_treeview_select (GtkTreeSelection *treeselection, gpointer data)
 490 {
 491   PsppireSelector *selector = data;
 492
 493   gtk_tree_selection_unselect_all (gtk_tree_view_get_selection (GTK_TREE_VIEW (selector->source)));
 494
 495   set_direction (selector, PSPPIRE_SELECTOR_DEST_TO_SOURCE);
 496 }
 497
 498 /* Callback for source deselection, when the dest is GtkEntry */
 499 static void
 500 de_select_selection_entry (PsppireSelector *selector)
 501 {
 502   gtk_entry_set_text (GTK_ENTRY (selector->dest), "");
 503 }
 504
 505 /* Callback for source deselection, when the dest is GtkTreeView */
 506 static void
 507 de_select_selection_tree_view (PsppireSelector *selector)
 508 {
 509   GList *item;
 510
 511   GtkTreeSelection* selection =
 512     gtk_tree_view_get_selection ( GTK_TREE_VIEW (selector->dest));
 513
 514   GtkTreeModel *model =
 515     gtk_tree_view_get_model (GTK_TREE_VIEW (selector->dest));
 516
 517   GList *selected_rows =
 518     gtk_tree_selection_get_selected_rows (selection, NULL);
 519
 520   g_return_if_fail (selector->select_items);
 521
 522   /* Convert paths to RowRefs */
 523   for (item = g_list_first (selected_rows);
 524        item != NULL;
 525        item = g_list_next (item))
 526     {
 527       GtkTreeRowReference* rowref;
 528       GtkTreePath *path  = item->data;
 529
 530       rowref = gtk_tree_row_reference_new (GTK_TREE_MODEL (model), path);
 531
 532       item->data = rowref ;
 533       gtk_tree_path_free (path);
 534     }
 535
 536   /* Remove each selected row from the dest widget */
 537   for (item = g_list_first (selected_rows);
 538        item != NULL;
 539        item = g_list_next (item))
 540     {
 541       GtkTreeIter iter;
 542       GtkTreeRowReference *rr = item->data;
 543
 544       GtkTreePath *path = gtk_tree_row_reference_get_path (rr);
 545
 546       gtk_tree_model_get_iter (GTK_TREE_MODEL (model), &iter, path);
 547
 548       gtk_list_store_remove (GTK_LIST_STORE (model), &iter);
 549
 550       gtk_tree_path_free (path);
 551     }
 552
 553   /* Delete list of RowRefs and its contents */
 554   g_list_foreach (selected_rows, (GFunc) gtk_tree_row_reference_free, NULL);
 555   g_list_free (selected_rows);
 556 }
 557
 558
 559 /* Removes something from the DEST widget */
 560 static void
 561 de_select_selection (PsppireSelector *selector)
 562 {
 563   selector->selecting = TRUE;
 564
 565   if ( GTK_IS_TREE_VIEW (selector->dest ) )
 566     de_select_selection_tree_view (selector);
 567
 568   else if ( GTK_IS_ENTRY (selector->dest))
 569     de_select_selection_entry (selector);
 570
 571   else
 572     g_assert_not_reached ();
 573
 574   selector->selecting = FALSE;
 575
 576   gtk_tree_model_filter_refilter (selector->filtered_source);
 577
 578   g_signal_emit (selector, signals [DE_SELECTED], 0);
 579 }
 580
 581
 582 /* Puts something into the DEST widget */
 583 static void
 584 select_selection (PsppireSelector *selector)
 585 {
 586   GList *item ;
 587   GtkTreeSelection* selection =
 588     gtk_tree_view_get_selection ( GTK_TREE_VIEW (selector->source));
 589
 590   GList *selected_rows =
 591     gtk_tree_selection_get_selected_rows (selection, NULL);
 592
 593   GtkTreeModel *childmodel  = gtk_tree_model_filter_get_model
 594     (selector->filtered_source);
 595
 596   g_return_if_fail (selector->select_items);
 597
 598   selector->selecting = TRUE;
 599
 600   for (item = g_list_first (selected_rows);
 601        item != NULL;
 602        item = g_list_next (item))
 603     {
 604       GtkTreeIter child_iter;
 605       GtkTreeIter iter;
 606       GtkTreePath *path  = item->data;
 607
 608       gtk_tree_model_get_iter (GTK_TREE_MODEL (selector->filtered_source),
 609                                &iter, path);
 610
 611       gtk_tree_model_filter_convert_iter_to_child_iter
 612         (selector->filtered_source,
 613          &child_iter,
 614          &iter);
 615
 616       selector->select_items (child_iter,
 617                               selector->dest,
 618                               childmodel,
 619                               selector->select_user_data
 620                               );
 621     }
 622
 623   g_list_foreach (selected_rows, (GFunc) gtk_tree_path_free, NULL);
 624   g_list_free (selected_rows);
 625
 626   gtk_tree_model_filter_refilter (selector->filtered_source);
 627
 628   g_signal_emit (selector, signals [SELECTED], 0);
 629
 630   selector->selecting = FALSE;
 631 }
 632
 633 /* Callback for when the selector button is clicked,
 634    or other event which causes the selector's action to occur.
 635  */
 636 static void
 637 on_activate (PsppireSelector *selector, gpointer data)
 638 {
 639   switch (selector->direction)
 640     {
 641     case PSPPIRE_SELECTOR_SOURCE_TO_DEST:
 642       select_selection (selector);
 643       break;
 644     case PSPPIRE_SELECTOR_DEST_TO_SOURCE:
 645       de_select_selection (selector);
 646       break;
 647     default:
 648       g_assert_not_reached ();
 649       break;
 650     }
 651 }
 652
 653 static gboolean
 654 permissive_filter (GtkTreeModel *model, GtkTreeIter *iter,
 655                  PsppireSelector *selector)
 656 {
 657   return FALSE;
 658 }
 659
 660 /* Default visibility filter for GtkTreeView DEST widget */
 661 static gboolean
 662 is_item_in_dest (GtkTreeModel *model, GtkTreeIter *iter,
 663                  PsppireSelector *selector)
 664 {
 665   GtkTreeModel *dest_model;
 666   GtkTreeIter dest_iter;
 667   GtkTreeIter source_iter;
 668   gint index;
 669   GtkTreePath *path ;
 670   GtkTreeModel *source_model;
 671
 672   if ( GTK_IS_TREE_MODEL_FILTER (model) )
 673     {
 674       source_model = gtk_tree_model_filter_get_model
 675         (GTK_TREE_MODEL_FILTER (model));
 676
 677       gtk_tree_model_filter_convert_iter_to_child_iter
 678         ( GTK_TREE_MODEL_FILTER (model),  &source_iter,  iter  );
 679     }
 680   else
 681     {
 682       source_model = model;
 683       source_iter = *iter;
 684     }
 685
 686   dest_model = gtk_tree_view_get_model (GTK_TREE_VIEW (selector->dest));
 687
 688   path = gtk_tree_model_get_path (source_model, &source_iter);
 689
 690   index = *gtk_tree_path_get_indices (path);
 691
 692   gtk_tree_path_free (path);
 693
 694   if ( ! gtk_tree_model_get_iter_first (dest_model, &dest_iter) )
 695     return FALSE;
 696
 697   do
 698     {
 699       int x;
 700       GValue value = {0};
 701       GValue int_value = {0};
 702       gtk_tree_model_get_value (dest_model, &dest_iter, 0, &value);
 703
 704       g_value_init (&int_value, G_TYPE_INT);
 705
 706       g_value_transform (&value, &int_value);
 707
 708       x = g_value_get_int (&int_value);
 709
 710       g_value_unset (&int_value);
 711       g_value_unset (&value);
 712
 713       if ( x == index )
 714         return TRUE;
 715     }
 716   while (gtk_tree_model_iter_next (dest_model, &dest_iter));
 717
 718   return FALSE;
 719 }
 720
 721 /* Visibility function for items in the SOURCE widget.
 722    Returns TRUE iff *all* the selectors for which SOURCE is associated
 723    are visible */
 724 static gboolean
 725 is_source_item_visible (GtkTreeModel *childmodel,
 726                         GtkTreeIter *iter, gpointer data)
 727 {
 728   PsppireSelector *selector = data;
 729   PsppireSelectorClass *class = g_type_class_peek (PSPPIRE_SELECTOR_TYPE);
 730
 731   GList *list = NULL;
 732
 733   list = g_hash_table_lookup (class->source_hash, selector->source);
 734
 735   while (list)
 736     {
 737       PsppireSelector *selector = list->data;
 738
 739       if ( selector->filter && selector->filter (childmodel, iter, selector))
 740         return FALSE;
 741
 742       list = list->next;
 743     }
 744
 745
 746   return TRUE;
 747 }
 748
 749 /* set the source widget to SOURCE */
 750 static void
 751 set_tree_view_source (PsppireSelector *selector,
 752                       GtkTreeView *source)
 753 {
 754
 755   GList *list = NULL;
 756
 757   PsppireSelectorClass *class = g_type_class_peek (PSPPIRE_SELECTOR_TYPE);
 758
 759   GtkTreeModel *model = gtk_tree_view_get_model (source);
 760
 761   if ( ! (list = g_hash_table_lookup (class->source_hash, source)))
 762     {
 763       selector->filtered_source =
 764         GTK_TREE_MODEL_FILTER (gtk_tree_model_filter_new (model, NULL));
 765
 766       gtk_tree_view_set_model (source,
 767                                GTK_TREE_MODEL (selector->filtered_source));
 768
 769       list = g_list_append (list, selector);
 770       g_hash_table_insert (class->source_hash, source, list);
 771
 772
 773       gtk_tree_model_filter_set_visible_func (selector->filtered_source,
 774                                               is_source_item_visible,
 775                                               selector,
 776                                               NULL);
 777     }
 778   else
 779     {  /* Append this selector to the list and push the <source,list>
 780           pair onto the hash table */
 781
 782       selector->filtered_source = GTK_TREE_MODEL_FILTER (model);
 783
 784       if ( NULL == g_list_find (list, selector) )
 785         {
 786           if ( selector->primary_requested )
 787             list = g_list_prepend (list, selector);
 788           else
 789             list = g_list_append (list, selector);
 790           g_hash_table_replace (class->source_hash, source, list);
 791         }
 792     }
 793
 794
 795 }
 796
 797
 798 /*
 799    Callback for when the destination treeview's data changes
 800  */
 801 static void
 802 on_dest_data_change (GtkTreeModel *tree_model,
 803                      GtkTreePath  *path,
 804                      GtkTreeIter  *iter,
 805                      gpointer      user_data)
 806 {
 807   PsppireSelector *selector = user_data;
 808
 809   if ( selector->selecting) return;
 810
 811   gtk_tree_model_filter_refilter (selector->filtered_source);
 812 }
 813
 814
 815 static void
 816 on_dest_data_delete (GtkTreeModel *tree_model,
 817                      GtkTreePath  *path,
 818                      gpointer      user_data)
 819 {
 820   PsppireSelector *selector = user_data;
 821
 822   if ( selector->selecting ) return;
 823
 824   gtk_tree_model_filter_refilter (selector->filtered_source);
 825 }
 826
 827
 828 static void
 829 xxx (PsppireSelector *selector)
 830 {
 831   GtkTreeModel *model = gtk_tree_view_get_model (GTK_TREE_VIEW (selector->dest));
 832
 833   g_signal_connect (model, "row-changed", G_CALLBACK (on_dest_data_change),
 834                     selector);
 835
 836   g_signal_connect (model, "row-deleted", G_CALLBACK (on_dest_data_delete),
 837                     selector);
 838 }
 839
 840 /* Set the destination widget to DEST */
 841 static void
 842 set_tree_view_dest (PsppireSelector *selector,
 843                     GtkTreeView *dest)
 844 {
 845   GtkTreeSelection* selection = gtk_tree_view_get_selection (dest);
 846
 847
 848   gtk_tree_selection_set_mode (selection, GTK_SELECTION_MULTIPLE);
 849
 850   g_signal_connect (selection, "changed", G_CALLBACK (on_dest_treeview_select),
 851                     selector);
 852
 853
 854   g_signal_connect_swapped (dest, "notify::model",
 855                             G_CALLBACK (xxx), selector);
 856
 857 }
 858
 859 /* Callback which causes the filter to be refiltered.
 860    Called when the DEST GtkEntry is activated (Enter is pressed), or when it
 861    looses focus.
 862 */
 863 static gboolean
 864 refilter (PsppireSelector *selector)
 865 {
 866   gtk_tree_model_filter_refilter (selector->filtered_source);
 867   return FALSE;
 868 }
 869
 870 /* Callback for when the DEST GtkEntry is selected (clicked) */
 871 static gboolean
 872 on_entry_dest_select (GtkWidget *widget, GdkEventFocus *event, gpointer data)
 873 {
 874   PsppireSelector * selector = data;
 875
 876   gtk_tree_selection_unselect_all (gtk_tree_view_get_selection (GTK_TREE_VIEW (selector->source)));
 877   set_direction (selector, PSPPIRE_SELECTOR_DEST_TO_SOURCE);
 878
 879   return FALSE;
 880 }
 881
 882
 883
 884 /* Callback for when an item disappears from the source list.
 885    By implication, this means that the item has been inserted into the
 886    destination.
 887  */
 888 static void
 889 on_row_deleted (PsppireSelector *selector)
 890 {
 891   g_signal_emit (selector, signals [SELECTED], 0);
 892 }
 893
 894 /* Callback for when a new item appears in the source list.
 895    By implication, this means that an item has been deleted from the
 896    destination.
 897  */
 898 static void
 899 on_row_inserted (PsppireSelector *selector)
 900 {
 901   g_signal_emit (selector, signals [DE_SELECTED], 0);
 902 }
 903
 904
 905
 906 /* Set DEST to be the destination GtkEntry widget */
 907 static void
 908 set_entry_dest (PsppireSelector *selector,
 909                 GtkEntry *dest)
 910 {
 911   g_signal_connect_swapped (dest, "activate", G_CALLBACK (refilter),
 912                     selector);
 913
 914   g_signal_connect_swapped (dest, "changed", G_CALLBACK (refilter),
 915                     selector);
 916
 917   g_signal_connect (dest, "focus-in-event", G_CALLBACK (on_entry_dest_select),
 918                     selector);
 919
 920   g_signal_connect_swapped (dest, "focus-out-event", G_CALLBACK (refilter),
 921                     selector);
 922
 923
 924   g_signal_connect_swapped (selector->filtered_source, "row-deleted",
 925                     G_CALLBACK (on_row_deleted), selector);
 926
 927   g_signal_connect_swapped (selector->filtered_source, "row-inserted",
 928                     G_CALLBACK (on_row_inserted), selector);
 929 }
 930
 931 static void
 932 set_default_filter (PsppireSelector *selector)
 933 {
 934   if ( selector->filter == NULL)
 935     {
 936       if  (GTK_IS_TREE_VIEW (selector->dest))
 937         selector->filter = permissive_filter;
 938     }
 939 }
 940
 941 static void
 942 update_subjects (PsppireSelector *selector)
 943 {
 944   GtkTreeModel *model = NULL;
 945
 946   if ( NULL == selector->dest )
 947     return;
 948
 949   set_default_filter (selector);
 950
 951   if ( NULL == selector->source )
 952     return;
 953
 954   g_signal_connect_swapped (selector->source, "notify::model",
 955                             G_CALLBACK (update_subjects), selector);
 956
 957   model = gtk_tree_view_get_model (GTK_TREE_VIEW (selector->source));
 958
 959   if ( NULL == model)
 960     return;
 961
 962
 963   if ( GTK_IS_TREE_VIEW (selector->source))
 964     set_tree_view_source (selector, GTK_TREE_VIEW (selector->source) );
 965   else
 966     g_error ("Unsupported source widget: %s", G_OBJECT_TYPE_NAME (selector->source));
 967
 968   if ( NULL == selector->dest)
 969     ;
 970   else if  ( GTK_IS_TREE_VIEW (selector->dest))
 971     {
 972       set_tree_view_dest (selector, GTK_TREE_VIEW (selector->dest));
 973     }
 974
 975   else if ( GTK_IS_ENTRY (selector->dest))
 976     set_entry_dest (selector, GTK_ENTRY (selector->dest));
 977
 978   else if (GTK_IS_TEXT_VIEW (selector->dest))
 979     {
 980       /* Nothing to be done */
 981     }
 982   else
 983     g_error ("Unsupported destination widget: %s", G_OBJECT_TYPE_NAME (selector->dest));
 984
 985
 986   /* FIXME: Remove this dependency */
 987   if ( PSPPIRE_IS_DICT_VIEW (selector->source) )
 988     {
 989       GObjectClass *class = G_OBJECT_GET_CLASS (selector);
 990       GType type = G_OBJECT_TYPE (selector->dest);
 991
 992       SelectItemsFunc *func  =
 993         g_hash_table_lookup (PSPPIRE_SELECTOR_CLASS (class)->default_selection_funcs, (gpointer) type);
 994
 995       if ( func )
 996         psppire_selector_set_select_func (PSPPIRE_SELECTOR (selector),
 997                                           func, NULL);
 998     }
 999 }
1000
1001
1002 void
1003 psppire_selector_set_default_selection_func (GType type, SelectItemsFunc *func)
1004 {
1005   GObjectClass *class = g_type_class_ref (PSPPIRE_SELECTOR_TYPE);
1006
1007   g_hash_table_insert (PSPPIRE_SELECTOR_CLASS (class)->default_selection_funcs, (gpointer) type, func);
1008
1009   g_type_class_unref (class);
1010 }
1011
1012
1013
1014
1015 /* Set FILTER_FUNC for this selector */
1016 void
1017 psppire_selector_set_filter_func (PsppireSelector *selector,
1018                                   FilterItemsFunc *filter_func)
1019 {
1020   selector->filter = filter_func ;
1021
1022   set_default_filter (selector);
1023 }
1024
1025
1026 /* Set SELECT_FUNC for this selector */
1027 void
1028 psppire_selector_set_select_func (PsppireSelector *selector,
1029                                SelectItemsFunc *select_func,
1030                                gpointer user_data)
1031 {
1032   selector->select_user_data = user_data;
1033   selector->select_items = select_func;
1034 }
1035
1036
1037
1038 void
1039 psppire_selector_set_allow (PsppireSelector *selector, AllowSelectionFunc *allow)
1040 {
1041   selector->allow_selection = allow;
1042 }
1043
1044
1045 GType
1046 psppire_selector_orientation_get_type (void)
1047 {
1048   static GType etype = 0;
1049   if (etype == 0) {
1050     static const GEnumValue values[] = {
1051       { PSPPIRE_SELECT_SOURCE_BEFORE_DEST, "PSPPIRE_SELECT_SOURCE_BEFORE_DEST", "source before destination" },
1052       { PSPPIRE_SELECT_SOURCE_AFTER_DEST, "PSPPIRE_SELECT_SOURCE_AFTER_DEST", "source after destination" },
1053       { PSPPIRE_SELECT_SOURCE_ABOVE_DEST, "PSPPIRE_SELECT_SOURCE_ABOVE_DEST", "source above destination" },
1054       { PSPPIRE_SELECT_SOURCE_BELOW_DEST, "PSPPIRE_SELECT_SOURCE_BELOW_DEST", "source below destination" },
1055       { 0, NULL, NULL }
1056     };
1057     etype = g_enum_register_static (g_intern_static_string ("PsppireSelectorOrientation"), values);
1058   }
1059   return etype;
1060 }