src/viktreeview.c

   1 /*
   2  * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
   3  *
   4  * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <gtk/gtk.h>
  27 #include <glib/gi18n.h>
  28
  29 #include <string.h>
  30
  31 #include "viking.h"
  32 #include "config.h"
  33
  34 #define TREEVIEW_GET(model,iter,what,dest) gtk_tree_model_get(GTK_TREE_MODEL(model),(iter),(what),(dest),-1)
  35
  36 enum {
  37   VT_ITEM_EDITED_SIGNAL,
  38   VT_ITEM_TOGGLED_SIGNAL,
  39   VT_LAST_SIGNAL
  40 };
  41
  42 static guint treeview_signals[VT_LAST_SIGNAL] = { 0, 0 };
  43
  44 static GObjectClass *parent_class;
  45
  46 enum
  47 {
  48   NAME_COLUMN = 0,
  49   VISIBLE_COLUMN,
  50   ICON_COLUMN,
  51   /* invisible */
  52
  53   TYPE_COLUMN,
  54   ITEM_PARENT_COLUMN,
  55   ITEM_POINTER_COLUMN,
  56   ITEM_DATA_COLUMN,
  57   HAS_VISIBLE_COLUMN,
  58   EDITABLE_COLUMN,
  59   /* properties dialog, delete, rename, etc. */
  60   NUM_COLUMNS
  61 };
  62
  63 struct _VikTreeview {
  64   GtkTreeView treeview;
  65   GtkTreeModel *model;
  66
  67   GdkPixbuf *layer_type_icons[VIK_LAYER_NUM_TYPES];
  68
  69   gboolean was_a_toggle;
  70 };
  71
  72 /* TODO: find, make "static" and put up here all non-"a_" functions */
  73 static void treeview_class_init ( VikTreeviewClass *klass );
  74 static void treeview_init ( VikTreeview *vt );
  75 static void treeview_finalize ( GObject *gob );
  76 static void treeview_add_columns ( VikTreeview *vt );
  77
  78 static gboolean treeview_drag_data_received ( GtkTreeDragDest *drag_dest, GtkTreePath *dest, GtkSelectionData *selection_data );
  79 static gboolean treeview_drag_data_delete ( GtkTreeDragSource *drag_source, GtkTreePath *path );
  80
  81 GType vik_treeview_get_type (void)
  82 {
  83   static GType vt_type = 0;
  84
  85   if (!vt_type)
  86   {
  87     static const GTypeInfo vt_info =
  88     {
  89       sizeof (VikTreeviewClass),
  90       NULL, /* base_init */
  91       NULL, /* base_finalize */
  92       (GClassInitFunc) treeview_class_init,
  93       NULL, /* class_finalize */
  94       NULL, /* class_data */
  95       sizeof (VikTreeview),
  96       0,
  97       (GInstanceInitFunc) treeview_init,
  98     };
  99     vt_type = g_type_register_static ( GTK_TYPE_TREE_VIEW, "VikTreeview", &vt_info, 0 );
 100   }
 101
 102   return vt_type;
 103 }
 104
 105 static void treeview_class_init ( VikTreeviewClass *klass )
 106 {
 107   /* Destructor */
 108   GObjectClass *object_class;
 109
 110   object_class = G_OBJECT_CLASS (klass);
 111
 112   object_class->finalize =  treeview_finalize;
 113
 114   parent_class = g_type_class_peek_parent (klass);
 115
 116   treeview_signals[VT_ITEM_EDITED_SIGNAL] = g_signal_new ( "item_edited", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (VikTreeviewClass, item_edited), NULL, NULL,
 117     gtk_marshal_VOID__POINTER_POINTER, G_TYPE_NONE, 2, GTK_TYPE_POINTER, G_TYPE_POINTER);
 118   /* VOID__UINT_POINTER: kinda hack-ish, but it works. */
 119
 120   treeview_signals[VT_ITEM_TOGGLED_SIGNAL] = g_signal_new ( "item_toggled", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (VikTreeviewClass, item_toggled), NULL, NULL,
 121     g_cclosure_marshal_VOID__POINTER, G_TYPE_NONE, 1, GTK_TYPE_POINTER );
 122 }
 123
 124 static void treeview_edited_cb (GtkCellRendererText *cell, gchar *path_str, const gchar *new_name, VikTreeview *vt)
 125 {
 126   GtkTreeIter iter;
 127
 128   /* get type and data */
 129   vik_treeview_get_iter_from_path_str ( vt, &iter, path_str );
 130
 131   g_signal_emit ( G_OBJECT(vt), treeview_signals[VT_ITEM_EDITED_SIGNAL], 0, &iter, new_name );
 132 }
 133
 134 static void treeview_toggled_cb (GtkCellRendererToggle *cell, gchar *path_str, VikTreeview *vt)
 135 {
 136   GtkTreeIter iter;
 137
 138   /* get type and data */
 139   vik_treeview_get_iter_from_path_str ( vt, &iter, path_str );
 140   vt->was_a_toggle = TRUE;
 141
 142   g_signal_emit ( G_OBJECT(vt),
 143 treeview_signals[VT_ITEM_TOGGLED_SIGNAL], 0, &iter );
 144 }
 145
 146 VikTreeview *vik_treeview_new ()
 147 {
 148   return VIK_TREEVIEW ( g_object_new ( VIK_TREEVIEW_TYPE, NULL ) );
 149 }
 150
 151 gint vik_treeview_item_get_type ( VikTreeview *vt, GtkTreeIter *iter )
 152 {
 153   gint rv;
 154   TREEVIEW_GET ( vt->model, iter, TYPE_COLUMN, &rv );
 155   return rv;
 156 }
 157
 158 gint vik_treeview_item_get_data ( VikTreeview *vt, GtkTreeIter *iter )
 159 {
 160   gint rv;
 161   TREEVIEW_GET ( vt->model, iter, ITEM_DATA_COLUMN, &rv );
 162   return rv;
 163 }
 164
 165 gpointer vik_treeview_item_get_pointer ( VikTreeview *vt, GtkTreeIter *iter )
 166 {
 167   gpointer rv;
 168   TREEVIEW_GET ( vt->model, iter, ITEM_POINTER_COLUMN, &rv );
 169   return rv;
 170 }
 171
 172 void vik_treeview_item_set_pointer ( VikTreeview *vt, GtkTreeIter *iter, gpointer pointer )
 173 {
 174   gtk_tree_store_set ( GTK_TREE_STORE(vt->model), iter, ITEM_POINTER_COLUMN, pointer, -1 );
 175 }
 176
 177 gpointer vik_treeview_item_get_parent ( VikTreeview *vt, GtkTreeIter *iter )
 178 {
 179   gpointer rv;
 180   TREEVIEW_GET ( vt->model, iter, ITEM_PARENT_COLUMN, &rv );
 181   return rv;
 182 }
 183
 184 gboolean vik_treeview_get_iter_from_path_str ( VikTreeview *vt, GtkTreeIter *iter, const gchar *path_str )
 185 {
 186   return gtk_tree_model_get_iter_from_string ( GTK_TREE_MODEL(vt->model), iter, path_str );
 187 }
 188
 189 static void treeview_add_columns ( VikTreeview *vt )
 190 {
 191   gint col_offset;
 192   GtkCellRenderer *renderer;
 193   GtkTreeViewColumn *column;
 194
 195   /* Layer column */
 196   renderer = gtk_cell_renderer_text_new ();
 197   g_signal_connect (renderer, "edited",
 198                     G_CALLBACK (treeview_edited_cb), vt);
 199
 200   g_object_set (G_OBJECT (renderer), "xalign", 0.0, NULL);
 201
 202   col_offset = gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (vt),
 203                                                             -1, _("Layer Name"),
 204                                                             renderer, "text",
 205                                                             NAME_COLUMN,
 206                                                             "editable", EDITABLE_COLUMN,
 207                                                             NULL);
 208
 209   column = gtk_tree_view_get_column (GTK_TREE_VIEW (vt), col_offset - 1);
 210   gtk_tree_view_column_set_sizing (GTK_TREE_VIEW_COLUMN (column),
 211                                    GTK_TREE_VIEW_COLUMN_AUTOSIZE);
 212   gtk_tree_view_column_set_expand (GTK_TREE_VIEW_COLUMN (column), TRUE);
 213
 214   /* Layer type */
 215   renderer = gtk_cell_renderer_pixbuf_new ();
 216
 217   g_object_set (G_OBJECT (renderer), "xalign", 0.5, NULL);
 218
 219   col_offset = gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (vt),
 220                                                             -1, "",
 221                                                             renderer, "pixbuf",
 222                                                             ICON_COLUMN,
 223                                                             NULL);
 224
 225   column = gtk_tree_view_get_column (GTK_TREE_VIEW (vt), col_offset - 1);
 226   gtk_tree_view_column_set_sizing (GTK_TREE_VIEW_COLUMN (column),
 227                                    GTK_TREE_VIEW_COLUMN_AUTOSIZE);
 228
 229   /* Layer visible */
 230   renderer = gtk_cell_renderer_toggle_new ();
 231   g_object_set (G_OBJECT (renderer), "xalign", 0.5, NULL);
 232
 233   g_signal_connect (renderer, "toggled", G_CALLBACK (treeview_toggled_cb), vt);
 234
 235   col_offset = gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (vt),
 236                                                             -1, "",
 237                                                             renderer,
 238                                                             "active",
 239                                                             VISIBLE_COLUMN,
 240                                                             "visible",
 241                                                             HAS_VISIBLE_COLUMN,
 242                                                             "activatable",
 243                                                             HAS_VISIBLE_COLUMN,
 244                                                             NULL);
 245
 246   column = gtk_tree_view_get_column (GTK_TREE_VIEW (vt), col_offset - 1);
 247   gtk_tree_view_column_set_sizing (GTK_TREE_VIEW_COLUMN (column),
 248                                    GTK_TREE_VIEW_COLUMN_AUTOSIZE);
 249
 250 }
 251
 252 static void select_cb(GtkTreeSelection *selection, gpointer data)
 253 {
 254   VikTreeview *vt = data;
 255   gint type;
 256   GtkTreeIter iter, parent;
 257   VikLayer *vl;
 258   VikWindow * vw;
 259
 260   if (!gtk_tree_selection_get_selected(selection, NULL, &iter)) return;
 261   type = vik_treeview_item_get_type( vt, &iter);
 262
 263   while ( type != VIK_TREEVIEW_TYPE_LAYER ) {
 264     if ( ! vik_treeview_item_get_parent_iter ( vt, &iter, &parent ) )
 265       return;
 266     iter = parent;
 267     type = vik_treeview_item_get_type (vt, &iter );
 268   }
 269
 270   vl = VIK_LAYER( vik_treeview_item_get_pointer ( vt, &iter ) );
 271
 272   vw = VIK_WINDOW(VIK_GTK_WINDOW_FROM_LAYER(vl));
 273   vik_window_selected_layer(vw, vl);
 274 }
 275
 276 static gboolean treeview_selection_filter(GtkTreeSelection *selection, GtkTreeModel *model, GtkTreePath *path, gboolean path_currently_selected, gpointer data)
 277 {
 278   VikTreeview *vt = data;
 279
 280   if (vt->was_a_toggle) {
 281     vt->was_a_toggle = FALSE;
 282     return FALSE;
 283   }
 284
 285   return TRUE;
 286 }
 287
 288 void treeview_init ( VikTreeview *vt )
 289 {
 290   guint16 i;
 291
 292   vt->was_a_toggle = FALSE;
 293
 294   vt->model = GTK_TREE_MODEL(gtk_tree_store_new ( NUM_COLUMNS, G_TYPE_STRING, G_TYPE_BOOLEAN, GDK_TYPE_PIXBUF, G_TYPE_INT, G_TYPE_POINTER, G_TYPE_POINTER, G_TYPE_INT, G_TYPE_BOOLEAN, G_TYPE_BOOLEAN ));
 295
 296   /* create tree view */
 297   gtk_tree_selection_set_select_function(gtk_tree_view_get_selection (GTK_TREE_VIEW(vt)), treeview_selection_filter, vt, NULL);
 298
 299   gtk_tree_view_set_model ( GTK_TREE_VIEW(vt), vt->model );
 300   treeview_add_columns ( vt );
 301   g_object_unref (vt->model);
 302
 303   gtk_tree_view_set_rules_hint (GTK_TREE_VIEW (vt), TRUE);
 304   gtk_tree_selection_set_mode (gtk_tree_view_get_selection (GTK_TREE_VIEW (vt)),
 305                                GTK_SELECTION_SINGLE);
 306
 307   /* Override treestore's dnd methods only; this is easier than deriving from GtkTreeStore.
 308    * The downside is that all treestores will have this behavior, so this needs to be
 309    * changed if we add more treeviews in the future.  //Alex
 310    */
 311   if (1) {
 312     GtkTreeDragSourceIface *isrc;
 313     GtkTreeDragDestIface *idest;
 314
 315     isrc = g_type_interface_peek (g_type_class_peek(G_OBJECT_TYPE(vt->model)), GTK_TYPE_TREE_DRAG_SOURCE);
 316     isrc->drag_data_delete = treeview_drag_data_delete;
 317
 318     idest = g_type_interface_peek (g_type_class_peek(G_OBJECT_TYPE(vt->model)), GTK_TYPE_TREE_DRAG_DEST);
 319     idest->drag_data_received = treeview_drag_data_received;
 320   }
 321
 322   for ( i = 0; i < VIK_LAYER_NUM_TYPES; i++ )
 323     vt->layer_type_icons[i] = vik_layer_load_icon ( i ); /* if icon can't be loaded, it will be null and simply not be shown. */
 324
 325   gtk_tree_view_set_reorderable (GTK_TREE_VIEW(vt), TRUE);
 326   g_signal_connect(gtk_tree_view_get_selection (GTK_TREE_VIEW (vt)), "changed",
 327       G_CALLBACK(select_cb), vt);
 328
 329 }
 330
 331 gboolean vik_treeview_item_get_parent_iter ( VikTreeview *vt, GtkTreeIter *iter,  GtkTreeIter *parent )
 332 {
 333   return gtk_tree_model_iter_parent ( GTK_TREE_MODEL(vt->model), parent, iter );
 334 }
 335
 336 gboolean vik_treeview_move_item ( VikTreeview *vt, GtkTreeIter *iter, gboolean up )
 337 {
 338   gint t = vik_treeview_item_get_type ( vt, iter );
 339   if ( t == VIK_TREEVIEW_TYPE_LAYER )
 340   {
 341     GtkTreeIter switch_iter;
 342     if (up)
 343     {
 344       /* iter to path to iter */
 345       GtkTreePath *path = gtk_tree_model_get_path ( vt->model, iter );
 346       if ( !gtk_tree_path_prev ( path ) || !gtk_tree_model_get_iter ( vt->model, &switch_iter, path ) )
 347       {
 348         gtk_tree_path_free ( path );
 349         return FALSE;
 350       }
 351       gtk_tree_path_free ( path );
 352     }
 353     else
 354     {
 355       switch_iter = *iter;
 356       if ( !gtk_tree_model_iter_next ( vt->model, &switch_iter ) )
 357         return FALSE;
 358     }
 359     gtk_tree_store_swap ( GTK_TREE_STORE(vt->model), iter, &switch_iter );
 360     return TRUE;
 361     /* now, the easy part. actually switching them, not the GUI */
 362   } /* if item is map */
 363   return FALSE;
 364 }
 365
 366 gboolean vik_treeview_get_iter_at_pos ( VikTreeview *vt, GtkTreeIter *iter, gint x, gint y )
 367 {
 368   GtkTreePath *path;
 369   gtk_tree_view_get_path_at_pos ( GTK_TREE_VIEW(vt), x, y, &path, NULL, NULL, NULL );
 370   if ( ! path )
 371     return FALSE;
 372
 373   gtk_tree_model_get_iter (GTK_TREE_MODEL(vt->model), iter, path);
 374   gtk_tree_path_free ( path );
 375   return TRUE;
 376 }
 377
 378 void vik_treeview_select_iter ( VikTreeview *vt, GtkTreeIter *iter )
 379 {
 380   gtk_tree_selection_select_iter ( gtk_tree_view_get_selection ( GTK_TREE_VIEW ( vt ) ), iter );
 381 }
 382
 383 gboolean vik_treeview_get_selected_iter ( VikTreeview *vt, GtkTreeIter *iter )
 384 {
 385   return gtk_tree_selection_get_selected ( gtk_tree_view_get_selection ( GTK_TREE_VIEW ( vt ) ), NULL, iter );
 386 }
 387
 388 void vik_treeview_item_delete ( VikTreeview *vt, GtkTreeIter *iter )
 389 {
 390   gtk_tree_store_remove ( GTK_TREE_STORE(vt->model), iter );
 391 }
 392
 393 /* Treeview Reform Project */
 394
 395 void vik_treeview_item_set_name ( VikTreeview *vt, GtkTreeIter *iter, const gchar *to )
 396 {
 397   g_return_if_fail ( iter != NULL && to != NULL );
 398   gtk_tree_store_set ( GTK_TREE_STORE(vt->model), iter, NAME_COLUMN, to, -1);
 399 }
 400
 401 void vik_treeview_item_set_visible ( VikTreeview *vt, GtkTreeIter *iter, gboolean to )
 402 {
 403   g_return_if_fail ( iter != NULL );
 404   gtk_tree_store_set ( GTK_TREE_STORE(vt->model), iter, VISIBLE_COLUMN, to, -1 );
 405 }
 406
 407 void vik_treeview_expand ( VikTreeview *vt, GtkTreeIter *iter )
 408 {
 409   GtkTreePath *path;
 410   path = gtk_tree_model_get_path ( vt->model, iter );
 411   gtk_tree_view_expand_row ( GTK_TREE_VIEW(vt), path, FALSE );
 412   gtk_tree_path_free ( path );
 413 }
 414
 415 void vik_treeview_item_select ( VikTreeview *vt, GtkTreeIter *iter )
 416 {
 417   gtk_tree_selection_select_iter ( gtk_tree_view_get_selection ( GTK_TREE_VIEW ( vt ) ), iter );
 418 }
 419
 420 void vik_treeview_add_layer ( VikTreeview *vt, GtkTreeIter *parent_iter, GtkTreeIter *iter, const gchar *name, gpointer parent,
 421                               gpointer item, gint data, gint icon_type )
 422 {
 423   g_assert ( iter != NULL );
 424   g_assert ( icon_type < VIK_LAYER_NUM_TYPES );
 425   gtk_tree_store_prepend ( GTK_TREE_STORE(vt->model), iter, parent_iter );
 426   gtk_tree_store_set ( GTK_TREE_STORE(vt->model), iter, NAME_COLUMN, name, VISIBLE_COLUMN, TRUE,
 427     TYPE_COLUMN, VIK_TREEVIEW_TYPE_LAYER, ITEM_PARENT_COLUMN, parent, ITEM_POINTER_COLUMN, item,
 428     ITEM_DATA_COLUMN, data, HAS_VISIBLE_COLUMN, TRUE, EDITABLE_COLUMN, TRUE,
 429     ICON_COLUMN, icon_type >= 0 ? vt->layer_type_icons[icon_type] : NULL, -1 );
 430 }
 431
 432 void vik_treeview_insert_layer ( VikTreeview *vt, GtkTreeIter *parent_iter, GtkTreeIter *iter, const gchar *name, gpointer parent,
 433                               gpointer item, gint data, gint icon_type, GtkTreeIter *sibling )
 434 {
 435   g_assert ( iter != NULL );
 436   g_assert ( icon_type < VIK_LAYER_NUM_TYPES );
 437   if (sibling) {
 438     gtk_tree_store_insert_before ( GTK_TREE_STORE(vt->model), iter, parent_iter, sibling );
 439   } else {
 440     gtk_tree_store_append ( GTK_TREE_STORE(vt->model), iter, parent_iter );
 441   }
 442
 443   gtk_tree_store_set ( GTK_TREE_STORE(vt->model), iter, NAME_COLUMN, name, VISIBLE_COLUMN, TRUE,
 444     TYPE_COLUMN, VIK_TREEVIEW_TYPE_LAYER, ITEM_PARENT_COLUMN, parent, ITEM_POINTER_COLUMN, item,
 445     ITEM_DATA_COLUMN, data, HAS_VISIBLE_COLUMN, TRUE, EDITABLE_COLUMN, TRUE,
 446     ICON_COLUMN, icon_type >= 0 ? vt->layer_type_icons[icon_type] : NULL, -1 );
 447 }
 448
 449 void vik_treeview_add_sublayer ( VikTreeview *vt, GtkTreeIter *parent_iter, GtkTreeIter *iter, const gchar *name, gpointer parent, gpointer item,
 450                                  gint data, GdkPixbuf *icon, gboolean has_visible, gboolean editable )
 451 {
 452   g_assert ( iter != NULL );
 453
 454   gtk_tree_store_prepend ( GTK_TREE_STORE(vt->model), iter, parent_iter );
 455   gtk_tree_store_set ( GTK_TREE_STORE(vt->model), iter, NAME_COLUMN, name, VISIBLE_COLUMN, TRUE, TYPE_COLUMN, VIK_TREEVIEW_TYPE_SUBLAYER, ITEM_PARENT_COLUMN, parent, ITEM_POINTER_COLUMN, item, ITEM_DATA_COLUMN, data, HAS_VISIBLE_COLUMN, has_visible, EDITABLE_COLUMN, editable, ICON_COLUMN, icon, -1 );
 456 }
 457
 458
 459 #ifdef VIK_CONFIG_ALPHABETIZED_TRW
 460
 461 void vik_treeview_sublayer_realphabetize ( VikTreeview *vt, GtkTreeIter *iter, const gchar *newname )
 462 {
 463   GtkTreeIter search_iter, parent_iter;
 464   gchar *search_name = NULL;
 465   g_assert ( iter != NULL );
 466
 467   gtk_tree_model_iter_parent ( vt->model, &parent_iter, iter );
 468
 469   g_assert ( gtk_tree_model_iter_children ( vt->model, &search_iter, &parent_iter ) );
 470
 471   do {
 472     gtk_tree_model_get ( vt->model, &search_iter, NAME_COLUMN, &search_name, -1 );
 473     if ( strcmp ( search_name, newname ) > 0 ) /* not >= or would trip on itself */
 474     {
 475       gtk_tree_store_move_before ( GTK_TREE_STORE(vt->model), iter, &search_iter );
 476       g_free (search_name);
 477       search_name = NULL;
 478       return;
 479     }
 480     g_free (search_name);
 481     search_name = NULL;
 482   } while ( gtk_tree_model_iter_next ( vt->model, &search_iter ) );
 483
 484   gtk_tree_store_move_before ( GTK_TREE_STORE(vt->model), iter, NULL );
 485 }
 486
 487 void vik_treeview_add_sublayer_alphabetized
 488                  ( VikTreeview *vt, GtkTreeIter *parent_iter, GtkTreeIter *iter, const gchar *name, gpointer parent, gpointer item,
 489                    gint data, GdkPixbuf *icon, gboolean has_visible, gboolean editable )
 490 {
 491   GtkTreeIter search_iter;
 492   gchar *search_name = NULL;
 493   g_assert ( iter != NULL );
 494
 495   if ( gtk_tree_model_iter_children ( vt->model, &search_iter, parent_iter ) )
 496   {
 497     gboolean found_greater_string = FALSE;
 498     do {
 499       gtk_tree_model_get ( vt->model, &search_iter, NAME_COLUMN, &search_name, -1 );
 500       if ( strcmp ( search_name, name ) >= 0 )
 501       {
 502         gtk_tree_store_insert_before ( GTK_TREE_STORE(vt->model), iter, parent_iter, &search_iter );
 503         found_greater_string = TRUE;
 504         g_free (search_name);
 505         search_name = NULL;
 506         break;
 507       }
 508       g_free (search_name);
 509       search_name = NULL;
 510     } while ( gtk_tree_model_iter_next ( vt->model, &search_iter ) );
 511
 512     if ( ! found_greater_string )
 513       gtk_tree_store_append ( GTK_TREE_STORE(vt->model), iter, parent_iter );
 514   }
 515   else
 516     gtk_tree_store_prepend ( GTK_TREE_STORE(vt->model), iter, parent_iter );
 517
 518   gtk_tree_store_set ( GTK_TREE_STORE(vt->model), iter, NAME_COLUMN, name, VISIBLE_COLUMN, TRUE, TYPE_COLUMN, VIK_TREEVIEW_TYPE_SUBLAYER, ITEM_PARENT_COLUMN, parent, ITEM_POINTER_COLUMN, item, ITEM_DATA_COLUMN, data, HAS_VISIBLE_COLUMN, has_visible, EDITABLE_COLUMN, editable, ICON_COLUMN, icon, -1 );
 519 }
 520
 521 #endif
 522
 523 static void treeview_finalize ( GObject *gob )
 524 {
 525   VikTreeview *vt = VIK_TREEVIEW ( gob );
 526   guint16 i;
 527
 528   for ( i = 0; i < VIK_LAYER_NUM_TYPES; i++ )
 529     if ( vt->layer_type_icons[i] != NULL )
 530       g_object_unref ( G_OBJECT(vt->layer_type_icons[i]) );
 531
 532   G_OBJECT_CLASS(parent_class)->finalize(gob);
 533 }
 534
 535 static gboolean treeview_drag_data_received (GtkTreeDragDest *drag_dest, GtkTreePath *dest, GtkSelectionData *selection_data)
 536 {
 537   GtkTreeModel *tree_model;
 538   GtkTreeStore *tree_store;
 539   GtkTreeModel *src_model = NULL;
 540   GtkTreePath *src_path = NULL, *dest_cp = NULL;
 541   gboolean retval = FALSE;
 542   GtkTreeIter src_iter, root_iter, dest_iter, dest_parent;
 543   gint *i_src = NULL;
 544   VikTreeview *vt;
 545   VikLayer *vl;
 546
 547   g_return_val_if_fail (GTK_IS_TREE_STORE (drag_dest), FALSE);
 548
 549   tree_model = GTK_TREE_MODEL (drag_dest);
 550   tree_store = GTK_TREE_STORE (drag_dest);
 551
 552   if (gtk_tree_get_row_drag_data (selection_data, &src_model, &src_path) && src_model == tree_model) {
 553     /*
 554      * Copy src_path to dest.  There are two subcases here, depending on what
 555      * is being dragged.
 556      *
 557      * 1. src_path is a layer. In this case, interpret the drop
 558      *    as a request to move the layer to a different aggregate layer.
 559      *    If the destination is not an aggregate layer, use the first
 560      *    ancestor that is.
 561      *
 562      * 2. src_path is a sublayer.  In this case, find ancestors of
 563      *    both source and destination nodes who are full layers,
 564      *    and call the move method of that layer type.
 565      *
 566      */
 567     if (!gtk_tree_model_get_iter (src_model, &src_iter, src_path)) {
 568       goto out;
 569     }
 570     if (!gtk_tree_path_compare(src_path, dest)) {
 571       goto out;
 572     }
 573
 574     i_src = gtk_tree_path_get_indices (src_path);
 575     dest_cp = gtk_tree_path_copy (dest);
 576
 577     gtk_tree_model_get_iter_first(tree_model, &root_iter);
 578     TREEVIEW_GET(tree_model, &root_iter, ITEM_POINTER_COLUMN, &vl);
 579     vt = vl->vt;
 580
 581
 582     if (gtk_tree_path_get_depth(dest_cp)>1) { /* can't be sibling of top layer */
 583       VikLayer *vl_src, *vl_dest;
 584
 585       /* Find the first ancestor that is a full layer, and store in dest_parent.
 586        * In addition, put in dest_iter where Gtk wants us to insert the dragged object.
 587        * (Note that this may end up being an invalid iter).
 588        */
 589       do {
 590         gtk_tree_path_up(dest_cp);
 591         dest_iter = dest_parent;
 592         gtk_tree_model_get_iter (src_model, &dest_parent, dest_cp);
 593       } while (gtk_tree_path_get_depth(dest_cp)>1 &&
 594                vik_treeview_item_get_type(vt, &dest_parent) != VIK_TREEVIEW_TYPE_LAYER);
 595
 596
 597       g_assert ( vik_treeview_item_get_parent(vt, &src_iter) );
 598       vl_src = vik_treeview_item_get_parent(vt, &src_iter);
 599       vl_dest = vik_treeview_item_get_pointer(vt, &dest_parent);
 600
 601       /* TODO: might want to allow different types, and let the clients handle how they want */
 602       if (vl_src->type == vl_dest->type && vik_layer_get_interface(vl_dest->type)->drag_drop_request) {
 603         //      g_print("moving an item from layer '%s' into layer '%s'\n", vl_src->name, vl_dest->name);
 604         vik_layer_get_interface(vl_dest->type)->drag_drop_request(vl_src, vl_dest, &src_iter, dest);
 605       }
 606     }
 607   }
 608
 609  out:
 610   if (dest_cp)
 611     gtk_tree_path_free(dest_cp);
 612   if (src_path)
 613     gtk_tree_path_free (src_path);
 614
 615   return retval;
 616 }
 617
 618 /*
 619  * This may not be necessary.
 620  */
 621 static gboolean treeview_drag_data_delete ( GtkTreeDragSource *drag_source, GtkTreePath *path )
 622 {
 623   gchar *s_dest = gtk_tree_path_to_string(path);
 624   g_print(_("delete data from %s\n"), s_dest);
 625   g_free(s_dest);
 626   return FALSE;
 627 }
 628