src/viklayer.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 #include "viking.h"
  23 #include "vikradiogroup.h"
  24 #include <string.h>
  25
  26 /* functions common to all layers. */
  27 /* TODO longone: rename interface free -> finalize */
  28
  29 extern VikLayerInterface vik_aggregate_layer_interface;
  30 extern VikLayerInterface vik_trw_layer_interface;
  31 extern VikLayerInterface vik_maps_layer_interface;
  32 extern VikLayerInterface vik_coord_layer_interface;
  33 extern VikLayerInterface vik_georef_layer_interface;
  34 extern VikLayerInterface vik_gps_layer_interface;
  35
  36 enum {
  37   VL_UPDATE_SIGNAL,
  38   VL_LAST_SIGNAL
  39 };
  40 static guint layer_signals[VL_LAST_SIGNAL] = { 0 };
  41
  42 static GObjectClass *parent_class;
  43
  44 static void layer_class_init ( VikLayerClass *klass );
  45 static void layer_init ( VikLayer *vl );
  46 static void layer_finalize ( VikLayer *vl );
  47 static gboolean layer_properties_factory ( VikLayer *vl, gpointer vp );
  48
  49
  50 /* TODO longone: rename vik_layer_init -> set_type */
  51
  52 GType vik_layer_get_type ()
  53 {
  54   static GType vl_type = 0;
  55
  56   if (!vl_type)
  57   {
  58     static const GTypeInfo vl_info =
  59     {
  60       sizeof (VikLayerClass),
  61       NULL, /* base_init */
  62       NULL, /* base_finalize */
  63       (GClassInitFunc) layer_class_init, /* class init */
  64       NULL, /* class_finalize */
  65       NULL, /* class_data */
  66       sizeof (VikLayer),
  67       0,
  68       (GInstanceInitFunc) layer_init /* instance init */
  69     };
  70     vl_type = g_type_register_static ( G_TYPE_OBJECT, "VikLayer", &vl_info, 0 );
  71   }
  72
  73   return vl_type;
  74 }
  75
  76 static void layer_class_init (VikLayerClass *klass)
  77 {
  78   GObjectClass *object_class;
  79
  80   object_class = G_OBJECT_CLASS (klass);
  81
  82   object_class->finalize = (GObjectFinalizeFunc) layer_finalize;
  83
  84   parent_class = g_type_class_peek_parent (klass);
  85
  86   layer_signals[VL_UPDATE_SIGNAL] = g_signal_new ( "update", G_TYPE_FROM_CLASS (klass),
  87       G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (VikLayerClass, update), NULL, NULL,
  88       g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
  89 }
  90
  91 void vik_layer_emit_update ( VikLayer *vl )
  92 {
  93   if ( vl->visible )
  94     g_signal_emit ( G_OBJECT(vl), layer_signals[VL_UPDATE_SIGNAL], 0 );
  95 }
  96
  97 static VikLayerInterface *vik_layer_interfaces[VIK_LAYER_NUM_TYPES] = {
  98   &vik_aggregate_layer_interface,
  99   &vik_trw_layer_interface,
 100   &vik_coord_layer_interface,
 101   &vik_georef_layer_interface,
 102   &vik_gps_layer_interface,
 103   &vik_maps_layer_interface,
 104 };
 105
 106 VikLayerInterface *vik_layer_get_interface ( gint type )
 107 {
 108   g_assert ( type < VIK_LAYER_NUM_TYPES );
 109   return vik_layer_interfaces[type];
 110 }
 111
 112 static void layer_init ( VikLayer *vl )
 113 {
 114   vl->visible = TRUE;
 115   vl->name = NULL;
 116   vl->realized = FALSE;
 117 }
 118
 119 void vik_layer_init ( VikLayer *vl, gint type )
 120 {
 121   vl->type = type;
 122 }
 123
 124 /* frees old name */
 125 void vik_layer_rename ( VikLayer *l, const gchar *new_name )
 126 {
 127   g_assert ( l != NULL);
 128   if ( l->name )
 129     g_free ( l->name );
 130   l->name = g_strdup ( new_name );
 131 }
 132
 133 void vik_layer_rename_no_copy ( VikLayer *l, gchar *new_name )
 134 {
 135   g_assert ( l != NULL);
 136   if ( l->name )
 137     g_free ( l->name );
 138   l->name = new_name;
 139 }
 140
 141 VikLayer *vik_layer_create ( gint type, gpointer vp, GtkWindow *w, gboolean interactive )
 142 {
 143   VikLayer *new_layer = NULL;
 144   g_assert ( type < VIK_LAYER_NUM_TYPES );
 145
 146   new_layer = vik_layer_interfaces[type]->create ( vp );
 147
 148   g_assert ( new_layer != NULL );
 149
 150   if ( interactive )
 151   {
 152     if ( vik_layer_properties ( new_layer, vp ) )
 153       vik_layer_rename ( VIK_LAYER(new_layer), vik_layer_interfaces[type]->name );
 154     else
 155     {
 156       g_object_unref ( G_OBJECT(new_layer) ); /* cancel that */
 157       new_layer = NULL;
 158     }
 159   }
 160   return new_layer;
 161 }
 162
 163 /* returns TRUE if OK was pressed */
 164 gboolean vik_layer_properties ( VikLayer *layer, gpointer vp )
 165 {
 166   if ( vik_layer_interfaces[layer->type]->properties )
 167     return vik_layer_interfaces[layer->type]->properties ( layer, vp );
 168   return layer_properties_factory ( layer, vp );
 169 }
 170
 171 void vik_layer_draw ( VikLayer *l, gpointer data )
 172 {
 173   if ( l->visible )
 174     if ( vik_layer_interfaces[l->type]->draw )
 175       vik_layer_interfaces[l->type]->draw ( l, data );
 176 }
 177
 178 void vik_layer_change_coord_mode ( VikLayer *l, VikCoordMode mode )
 179 {
 180   if ( vik_layer_interfaces[l->type]->change_coord_mode )
 181     vik_layer_interfaces[l->type]->change_coord_mode ( l, mode );
 182 }
 183
 184 VikLayer *vik_layer_copy ( VikLayer *vl, gpointer vp )
 185 {
 186   if ( vik_layer_interfaces[vl->type]->copy )
 187   {
 188     VikLayer *rv = vik_layer_interfaces[vl->type]->copy ( vl, vp );
 189     if ( rv )
 190     {
 191       vik_layer_rename ( rv, vl->name );
 192       rv->visible = vl->visible;
 193     }
 194     return rv;
 195   }
 196   else
 197     return NULL;
 198 }
 199
 200 typedef struct {
 201   gint layer_type;
 202   gint len;
 203   guint8 data[0];
 204 } header_t;
 205
 206 void vik_layer_marshall ( VikLayer *vl, guint8 **data, gint *len )
 207 {
 208   header_t *header;
 209   if ( vl && vik_layer_interfaces[vl->type]->marshall ) {
 210     vik_layer_interfaces[vl->type]->marshall ( vl, data, len );
 211     if (*data) {
 212       header = g_malloc(*len + sizeof(*header));
 213       header->layer_type = vl->type;
 214       header->len = *len;
 215       memcpy(header->data, *data, *len);
 216       g_free(*data);
 217       *data = (guint8 *)header;
 218       *len = *len + sizeof(*header);
 219     }
 220   } else {
 221     *data = NULL;
 222   }
 223 }
 224
 225 void vik_layer_marshall_params ( VikLayer *vl, guint8 **data, gint *datalen )
 226 {
 227   VikLayerParam *params = vik_layer_get_interface(vl->type)->params;
 228   VikLayerFuncGetParam get_param = vik_layer_get_interface(vl->type)->get_param;
 229   GByteArray* b = g_byte_array_new ();
 230   gint len;
 231
 232 #define vlm_append(obj, sz)     \
 233   len = (sz);                   \
 234   g_byte_array_append ( b, (guint8 *)&len, sizeof(len) );       \
 235   g_byte_array_append ( b, (guint8 *)(obj), len );
 236
 237   vlm_append(vl->name, strlen(vl->name));
 238
 239   if ( params && get_param )
 240   {
 241     VikLayerParamData d;
 242     guint16 i, params_count = vik_layer_get_interface(vl->type)->params_count;
 243     for ( i = 0; i < params_count; i++ )
 244     {
 245       d = get_param(vl, i);
 246       switch ( params[i].type )
 247       {
 248       case VIK_LAYER_PARAM_STRING:
 249         vlm_append(d.s, strlen(d.s));
 250         break;
 251       default:
 252         vlm_append(&d, sizeof(d));
 253         break;
 254       }
 255     }
 256   }
 257
 258   *data = b->data;
 259   *datalen = b->len;
 260   g_byte_array_free ( b, FALSE );
 261
 262 #undef vlm_append
 263 }
 264
 265 void vik_layer_unmarshall_params ( VikLayer *vl, guint8 *data, gint datalen, VikViewport *vvp )
 266 {
 267   VikLayerParam *params = vik_layer_get_interface(vl->type)->params;
 268   VikLayerFuncSetParam set_param = vik_layer_get_interface(vl->type)->set_param;
 269   gchar *s;
 270   guint8 *b = (guint8 *)data;
 271
 272 #define vlm_size (*(gint *)b)
 273 #define vlm_read(obj)                           \
 274   memcpy((obj), b+sizeof(gint), vlm_size);      \
 275   b += sizeof(gint) + vlm_size;
 276
 277   s = g_malloc(vlm_size + 1);
 278   s[vlm_size]=0;
 279   vlm_read(s);
 280
 281   vik_layer_rename(vl, s);
 282
 283   g_free(s);
 284
 285   if ( params && set_param )
 286   {
 287     VikLayerParamData d;
 288     guint16 i, params_count = vik_layer_get_interface(vl->type)->params_count;
 289     for ( i = 0; i < params_count; i++ )
 290     {
 291       switch ( params[i].type )
 292       {
 293       case VIK_LAYER_PARAM_STRING:
 294         s = g_malloc(vlm_size + 1);
 295         s[vlm_size]=0;
 296         vlm_read(s);
 297         d.s = s;
 298         set_param(vl, i, d, vvp);
 299         g_free(s);
 300         break;
 301       default:
 302         vlm_read(&d);
 303         set_param(vl, i, d, vvp);
 304         break;
 305       }
 306     }
 307   }
 308 }
 309
 310 VikLayer *vik_layer_unmarshall ( guint8 *data, gint len, VikViewport *vvp )
 311 {
 312   header_t *header;
 313
 314   header = (header_t *)data;
 315
 316   if ( vik_layer_interfaces[header->layer_type]->unmarshall ) {
 317     return vik_layer_interfaces[header->layer_type]->unmarshall ( header->data, header->len, vvp );
 318   } else {
 319     return NULL;
 320   }
 321 }
 322
 323 static void layer_finalize ( VikLayer *vl )
 324 {
 325   g_assert ( vl != NULL );
 326   if ( vik_layer_interfaces[vl->type]->free )
 327     vik_layer_interfaces[vl->type]->free ( vl );
 328   if ( vl->name )
 329     g_free ( vl->name );
 330   G_OBJECT_CLASS(parent_class)->finalize(G_OBJECT(vl));
 331 }
 332
 333 /* sublayer switching */
 334 gboolean vik_layer_sublayer_toggle_visible ( VikLayer *l, gint subtype, gpointer sublayer )
 335 {
 336   if ( vik_layer_interfaces[l->type]->sublayer_toggle_visible )
 337     return vik_layer_interfaces[l->type]->sublayer_toggle_visible ( l, subtype, sublayer );
 338   return TRUE; /* if unknown, will always be visible */
 339 }
 340
 341 void vik_layer_realize ( VikLayer *l, VikTreeview *vt, GtkTreeIter *layer_iter )
 342 {
 343   l->vt = vt;
 344   l->iter = *layer_iter;
 345   l->realized = TRUE;
 346   if ( vik_layer_interfaces[l->type]->realize )
 347     vik_layer_interfaces[l->type]->realize ( l, vt, layer_iter );
 348 }
 349
 350 void vik_layer_set_menu_items_selection(VikLayer *l, guint16 selection)
 351 {
 352   if ( vik_layer_interfaces[l->type]->set_menu_selection )
 353     vik_layer_interfaces[l->type]->set_menu_selection ( l, selection );
 354 }
 355
 356 guint16 vik_layer_get_menu_items_selection(VikLayer *l)
 357 {
 358   if ( vik_layer_interfaces[l->type]->get_menu_selection )
 359     return(vik_layer_interfaces[l->type]->get_menu_selection (l));
 360   else
 361     return(vik_layer_interfaces[l->type]->menu_items_selection);
 362 }
 363
 364 void vik_layer_add_menu_items ( VikLayer *l, GtkMenu *menu, gpointer vlp )
 365 {
 366   if ( vik_layer_interfaces[l->type]->add_menu_items )
 367     vik_layer_interfaces[l->type]->add_menu_items ( l, menu, vlp );
 368 }
 369
 370 gboolean vik_layer_sublayer_add_menu_items ( VikLayer *l, GtkMenu *menu, gpointer vlp, gint subtype, gpointer sublayer, GtkTreeIter *iter )
 371 {
 372   if ( vik_layer_interfaces[l->type]->sublayer_add_menu_items )
 373     return vik_layer_interfaces[l->type]->sublayer_add_menu_items ( l, menu, vlp, subtype, sublayer, iter );
 374   return FALSE;
 375 }
 376
 377
 378 const gchar *vik_layer_sublayer_rename_request ( VikLayer *l, const gchar *newname, gpointer vlp, gint subtype, gpointer sublayer, GtkTreeIter *iter )
 379 {
 380   if ( vik_layer_interfaces[l->type]->sublayer_rename_request )
 381     return vik_layer_interfaces[l->type]->sublayer_rename_request ( l, newname, vlp, subtype, sublayer, iter );
 382   return NULL;
 383 }
 384
 385 GdkPixbuf *vik_layer_load_icon ( gint type )
 386 {
 387   g_assert ( type < VIK_LAYER_NUM_TYPES );
 388   if ( vik_layer_interfaces[type]->icon )
 389     return gdk_pixbuf_from_pixdata ( vik_layer_interfaces[type]->icon, FALSE, NULL );
 390   return NULL;
 391 }
 392
 393 gboolean vik_layer_set_param ( VikLayer *layer, guint16 id, VikLayerParamData data, gpointer vp )
 394 {
 395   if ( vik_layer_interfaces[layer->type]->set_param )
 396     return vik_layer_interfaces[layer->type]->set_param ( layer, id, data, vp );
 397   return FALSE;
 398 }
 399
 400 void vik_layer_post_read ( VikLayer *layer, gpointer vp )
 401 {
 402   if ( vik_layer_interfaces[layer->type]->post_read )
 403     vik_layer_interfaces[layer->type]->post_read ( layer, vp );
 404 }
 405
 406 static GtkWidget *properties_widget_new_widget ( VikLayerParam *param, VikLayerParamData data )
 407 {
 408   GtkWidget *rv = NULL;
 409   switch ( param->widget_type )
 410   {
 411     case VIK_LAYER_WIDGET_COLOR:
 412       if ( param->type == VIK_LAYER_PARAM_COLOR )
 413         rv = gtk_color_button_new_with_color ( &(data.c) );
 414       break;
 415     case VIK_LAYER_WIDGET_CHECKBUTTON:
 416       if ( param->type == VIK_LAYER_PARAM_BOOLEAN )
 417       {
 418         //rv = gtk_check_button_new_with_label ( //param->title );
 419         rv = gtk_check_button_new ();
 420         if ( data.b )
 421           gtk_toggle_button_set_active ( GTK_TOGGLE_BUTTON(rv), TRUE );
 422       }
 423       break;
 424     case VIK_LAYER_WIDGET_COMBOBOX:
 425 #ifndef GTK_2_2
 426       if ( param->type == VIK_LAYER_PARAM_UINT && param->widget_data )
 427       {
 428         gchar **pstr = param->widget_data;
 429         rv = gtk_combo_box_new_text ();
 430         while ( *pstr )
 431           gtk_combo_box_append_text ( GTK_COMBO_BOX ( rv ), *(pstr++) );
 432         if ( param->extra_widget_data ) /* map of alternate uint values for options */
 433         {
 434           int i;
 435           for ( i = 0; ((const char **)param->widget_data)[i]; i++ )
 436             if ( ((guint *)param->extra_widget_data)[i] == data.u )
 437             {
 438               gtk_combo_box_set_active ( GTK_COMBO_BOX(rv), i );
 439               break;
 440             }
 441         }
 442         gtk_combo_box_set_active ( GTK_COMBO_BOX ( rv ), data.u );
 443       }
 444       break;
 445 #endif
 446     case VIK_LAYER_WIDGET_RADIOGROUP:
 447       /* widget_data and extra_widget_data are GList */
 448       if ( param->type == VIK_LAYER_PARAM_UINT && param->widget_data )
 449       {
 450         rv = vik_radio_group_new ( param->widget_data );
 451         if ( param->extra_widget_data ) /* map of alternate uint values for options */
 452         {
 453           int i;
 454           int nb_elem = g_list_length(param->widget_data);
 455           for ( i = 0; i < nb_elem; i++ )
 456             if ( g_list_nth_data(param->extra_widget_data, i) == data.u )
 457             {
 458               vik_radio_group_set_selected ( VIK_RADIO_GROUP(rv), i );
 459               break;
 460             }
 461         }
 462         else if ( data.u ) /* zero is already default */
 463           vik_radio_group_set_selected ( VIK_RADIO_GROUP(rv), data.u );
 464       }
 465       break;
 466     case VIK_LAYER_WIDGET_SPINBUTTON:
 467       if ( (param->type == VIK_LAYER_PARAM_DOUBLE || param->type == VIK_LAYER_PARAM_UINT
 468            || param->type == VIK_LAYER_PARAM_INT)  && param->widget_data )
 469       {
 470         gdouble init_val = (param->type == VIK_LAYER_PARAM_DOUBLE) ? data.d : (param->type == VIK_LAYER_PARAM_UINT ? data.u : data.i);
 471         VikLayerParamScale *scale = (VikLayerParamScale *) param->widget_data;
 472         rv = gtk_spin_button_new ( GTK_ADJUSTMENT(gtk_adjustment_new( init_val, scale->min, scale->max, scale->step, scale->step, scale->step )), scale->step, scale->digits );
 473       }
 474     break;
 475     case VIK_LAYER_WIDGET_ENTRY:
 476       if ( param->type == VIK_LAYER_PARAM_STRING )
 477       {
 478         rv = gtk_entry_new ();
 479         gtk_entry_set_text ( GTK_ENTRY(rv), data.s );
 480       }
 481       break;
 482     case VIK_LAYER_WIDGET_FILEENTRY:
 483       if ( param->type == VIK_LAYER_PARAM_STRING )
 484       {
 485         rv = vik_file_entry_new ();
 486         vik_file_entry_set_filename ( VIK_FILE_ENTRY(rv), data.s );
 487       }
 488       break;
 489     case VIK_LAYER_WIDGET_HSCALE:
 490       if ( (param->type == VIK_LAYER_PARAM_DOUBLE || param->type == VIK_LAYER_PARAM_UINT
 491            || param->type == VIK_LAYER_PARAM_INT)  && param->widget_data )
 492       {
 493         gdouble init_val = (param->type == VIK_LAYER_PARAM_DOUBLE) ? data.d : (param->type == VIK_LAYER_PARAM_UINT ? data.u : data.i);
 494         VikLayerParamScale *scale = (VikLayerParamScale *) param->widget_data;
 495         rv = gtk_hscale_new_with_range ( scale->min, scale->max, scale->step );
 496         gtk_scale_set_digits ( GTK_SCALE(rv), scale->digits );
 497         gtk_range_set_value ( GTK_RANGE(rv), init_val );
 498       }
 499   }
 500   return rv;
 501 }
 502
 503 static VikLayerParamData properties_widget_get_value ( GtkWidget *widget, VikLayerParam *param )
 504 {
 505   VikLayerParamData rv;
 506   switch ( param->widget_type )
 507   {
 508     case VIK_LAYER_WIDGET_COLOR:
 509       gtk_color_button_get_color ( GTK_COLOR_BUTTON(widget), &(rv.c) );
 510       break;
 511     case VIK_LAYER_WIDGET_CHECKBUTTON:
 512       rv.b = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget));
 513       break;
 514     case VIK_LAYER_WIDGET_COMBOBOX:
 515 #ifndef GTK_2_2
 516       rv.i = gtk_combo_box_get_active ( GTK_COMBO_BOX(widget) );
 517       if ( rv.i == -1 ) rv.i = 0;
 518       rv.u = rv.i;
 519       if ( param->extra_widget_data )
 520         rv.u = ((guint *)param->extra_widget_data)[rv.u];
 521       break;
 522 #endif
 523     case VIK_LAYER_WIDGET_RADIOGROUP:
 524       rv.u = vik_radio_group_get_selected(VIK_RADIO_GROUP(widget));
 525       if ( param->extra_widget_data )
 526         rv.u = (guint *)g_list_nth_data(param->extra_widget_data, rv.u);
 527       break;
 528     case VIK_LAYER_WIDGET_SPINBUTTON:
 529       if ( param->type == VIK_LAYER_PARAM_UINT )
 530         rv.u = gtk_spin_button_get_value_as_int ( GTK_SPIN_BUTTON(widget) );
 531       else if ( param->type == VIK_LAYER_PARAM_INT )
 532         rv.i = gtk_spin_button_get_value_as_int ( GTK_SPIN_BUTTON(widget) );
 533       else
 534         rv.d = gtk_spin_button_get_value ( GTK_SPIN_BUTTON(widget) );
 535       break;
 536     case VIK_LAYER_WIDGET_ENTRY:
 537       rv.s = gtk_entry_get_text ( GTK_ENTRY(widget) );
 538       break;
 539     case VIK_LAYER_WIDGET_FILEENTRY:
 540       rv.s = vik_file_entry_get_filename ( VIK_FILE_ENTRY(widget) );
 541       break;
 542     case VIK_LAYER_WIDGET_HSCALE:
 543       if ( param->type == VIK_LAYER_PARAM_UINT )
 544         rv.u = (guint32) gtk_range_get_value ( GTK_RANGE(widget) );
 545       else if ( param->type == VIK_LAYER_PARAM_INT )
 546         rv.i = (gint32) gtk_range_get_value ( GTK_RANGE(widget) );
 547       else
 548         rv.d = gtk_range_get_value ( GTK_RANGE(widget) );
 549       break;
 550   }
 551   return rv;
 552 }
 553
 554 /* false if cancel, true if OK */
 555 /* some would claim this wasn't written to be human-readable. */
 556 static gboolean layer_properties_factory ( VikLayer *vl, gpointer vp )
 557 {
 558   VikLayerParam *params = vik_layer_interfaces[vl->type]->params;
 559   guint16 params_count = vik_layer_interfaces[vl->type]->params_count;
 560   guint16 i, j, widget_count = 0;
 561   gboolean must_redraw = FALSE;
 562
 563   if ( ! params )
 564     return TRUE; /* no params == no options, so all is good */
 565
 566   for ( i = 0; i < params_count; i++ )
 567     if ( params[i].group != VIK_LAYER_NOT_IN_PROPERTIES )
 568       widget_count++;
 569
 570   if ( widget_count == 0)
 571     return FALSE;
 572   else
 573   {
 574     /* create widgets and titles; place in table */
 575     GtkWidget *dialog = gtk_dialog_new_with_buttons ( "Layer Properties",
 576                             VIK_GTK_WINDOW_FROM_WIDGET(vp),
 577                             GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
 578                             GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT,
 579                             GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, NULL );
 580     gint resp;
 581
 582     gchar **groups = vik_layer_interfaces[vl->type]->params_groups;
 583     guint8 groups_count = vik_layer_interfaces[vl->type]->params_groups_count;
 584
 585     GtkWidget *table = NULL;
 586     GtkWidget **tables = NULL; /* for more than one group */
 587
 588     GtkWidget *notebook = NULL;
 589     GtkWidget **widgets = g_malloc ( sizeof(GtkWidget *) * widget_count );
 590
 591     if ( groups && groups_count )
 592     {
 593       guint8 current_group;
 594       guint16 tab_widget_count;
 595       notebook = gtk_notebook_new ();
 596       gtk_box_pack_start (GTK_BOX(GTK_DIALOG(dialog)->vbox), notebook, FALSE, FALSE, 0);
 597       tables = g_malloc ( sizeof(GtkWidget *) * groups_count );
 598       for ( current_group = 0; current_group < groups_count; current_group++ )
 599       {
 600         tab_widget_count = 0;
 601         for ( j = 0; j < params_count; j ++ )
 602           if ( params[j].group == current_group )
 603             tab_widget_count++;
 604
 605         if ( tab_widget_count )
 606         {
 607           tables[current_group] = gtk_table_new ( tab_widget_count, 1, FALSE );
 608           gtk_notebook_append_page ( GTK_NOTEBOOK(notebook), tables[current_group], gtk_label_new(groups[current_group]) );
 609         }
 610       }
 611     }
 612     else
 613     {
 614       table = gtk_table_new( widget_count, 1, FALSE );
 615       gtk_box_pack_start (GTK_BOX(GTK_DIALOG(dialog)->vbox), table, FALSE, FALSE, 0);
 616     }
 617
 618     for ( i = 0, j = 0; i < params_count; i++ )
 619     {
 620       if ( params[i].group != VIK_LAYER_NOT_IN_PROPERTIES )
 621       {
 622         if ( tables )
 623           table = tables[MAX(0, params[i].group)]; /* round up NOT_IN_GROUP, that's not reasonable here */
 624
 625         widgets[j] = properties_widget_new_widget ( &(params[i]),
 626                          vik_layer_interfaces[vl->type]->get_param ( vl, i ) );
 627
 628         g_assert ( widgets[j] != NULL );
 629
 630         gtk_table_attach ( GTK_TABLE(table), gtk_label_new(params[i].title), 0, 1, j, j+1, 0, 0, 0, 0 );
 631         gtk_table_attach ( GTK_TABLE(table), widgets[j], 1, 2, j, j+1, GTK_EXPAND | GTK_FILL, 0, 2, 2 );
 632         j++;
 633       }
 634     }
 635
 636     gtk_widget_show_all ( dialog );
 637
 638     resp = gtk_dialog_run (GTK_DIALOG (dialog));
 639     if ( resp == GTK_RESPONSE_ACCEPT )
 640     {
 641       for ( i = 0, j = 0; i < params_count; i++ )
 642       {
 643         if ( params[i].group != VIK_LAYER_NOT_IN_PROPERTIES )
 644         {
 645           if ( vik_layer_interfaces[vl->type]->set_param ( vl, i,
 646               properties_widget_get_value ( widgets[j], &(params[i]) ), vp ) )
 647             must_redraw = TRUE;
 648           j++;
 649         }
 650       }
 651       vik_layer_post_read ( vl, vp ); /* update any gc's */
 652
 653       gtk_widget_destroy ( dialog ); /* hide before redrawing. */
 654       g_free ( widgets );
 655
 656       if ( must_redraw )
 657         vik_layer_emit_update ( vl ); /* if this is a new layer, it won't redraw twice because no on'es listening to this signal. */
 658       return TRUE; /* user clicked OK */
 659     }
 660
 661     if ( tables )
 662       g_free ( tables );
 663     gtk_widget_destroy ( dialog );
 664     g_free ( widgets );
 665     return FALSE;
 666   }
 667 }