trunk/src/relation_edit.c

/*
 * Copyright (C) 2008 Till Harbaum <till@harbaum.org>.
 *
 * This file is part of OSM2Go.
 *
 * OSM2Go is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * OSM2Go is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with OSM2Go.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "appdata.h"

/* UI sizes */
/* TH: All this dialog size stuff should imho go into one central place */

#ifdef USE_HILDON
// Making the dialog a little wider makes it less "crowded" 
static const guint LIST_OF_RELATIONS_DIALOG_WIDTH   = 500;
static const guint LIST_OF_RELATIONS_DIALOG_HEIGHT  = 300;
static const guint LIST_OF_MEMBERS_DIALOG_WIDTH   = 500;
static const guint LIST_OF_MEMBERS_DIALOG_HEIGHT  = 300;
#else
// Desktop mode dialogs should be narrower and taller
static const guint LIST_OF_RELATIONS_DIALOG_WIDTH  = 475;
static const guint LIST_OF_RELATIONS_DIALOG_HEIGHT = 350;
static const guint LIST_OF_MEMBERS_DIALOG_WIDTH   = 450;
static const guint LIST_OF_MEMBERS_DIALOG_HEIGHT  = 350;
#endif


/* --------------- relation dialog for an item (node or way) ----------- */

typedef struct {
  relation_item_t *item;
  appdata_t *appdata;
  GtkWidget *dialog, *list;
  GtkListStore *store;
} relitem_context_t;

enum {
  RELITEM_COL_SELECTED = 0,
  RELITEM_COL_TYPE,
  RELITEM_COL_ROLE,
  RELITEM_COL_NAME,
  RELITEM_COL_DATA,
  RELITEM_NUM_COLS
};

typedef struct role_chain_s {
  char *role;
  struct role_chain_s *next;
} role_chain_t;

static gboolean relation_add_item(GtkWidget *parent,
                              relation_t *relation, relation_item_t *item) {
  role_chain_t *chain = NULL, **chainP = &chain;

  printf("add item of type %d to relation #%ld\n", 
         item->type, relation->id);

  /* ask the user for the role of the new item in this relation */
  
  /* collect roles first */
  member_t *member = relation->member;
  while(member) {
    if(member->role) {
      /* check if this role has already been saved */
      gboolean already_stored = FALSE;
      role_chain_t *crole = chain;
      while(crole) {
        if(strcasecmp(crole->role, member->role) == 0) already_stored = TRUE;
        crole = crole->next;
      }
      
      /* not stored yet: attach it */
      if(!already_stored) {
        *chainP = g_new0(role_chain_t, 1);
        (*chainP)->role = g_strdup(member->role);
        chainP = &(*chainP)->next;
      }
    }
    member = member->next;
  }

  /* ------------------ role dialog ---------------- */
  GtkWidget *dialog = gtk_dialog_new_with_buttons(_("Select role"),
          GTK_WINDOW(parent), GTK_DIALOG_MODAL,
          GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, 
          GTK_STOCK_OK, GTK_RESPONSE_ACCEPT,
          NULL);

  gtk_dialog_set_default_response(GTK_DIALOG(dialog), GTK_RESPONSE_ACCEPT);

  char *type = osm_tag_get_by_key(relation->tag, "type");

  char *info_str = NULL;
  if(type) info_str = g_strdup_printf(_("In relation of type: %s"), type);
  else     info_str = g_strdup_printf(_("In relation #%ld"), relation->id);
  gtk_box_pack_start_defaults(GTK_BOX(GTK_DIALOG(dialog)->vbox), 
                              gtk_label_new(info_str));
  g_free(info_str);

  char *name = osm_tag_get_by_key(relation->tag, "name");
  if(name) 
    gtk_box_pack_start_defaults(GTK_BOX(GTK_DIALOG(dialog)->vbox), 
                                gtk_label_new(name));

  GtkWidget *hbox = gtk_hbox_new(FALSE, 8);
  gtk_box_pack_start_defaults(GTK_BOX(hbox), gtk_label_new(_("Role:")));

  GtkWidget *entry = NULL;
  if(chain) {
    entry = gtk_combo_box_entry_new_text();

    /* fill combo box with presets */
    while(chain) {
      role_chain_t *next = chain->next;
      gtk_combo_box_append_text(GTK_COMBO_BOX(entry), chain->role);
      g_free(chain);
      chain = next;
    }
  } else
    entry = gtk_entry_new();

  gtk_box_pack_start_defaults(GTK_BOX(hbox), entry);
  gtk_box_pack_start_defaults(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox);

  gtk_widget_show_all(dialog);
  if(GTK_RESPONSE_ACCEPT != gtk_dialog_run(GTK_DIALOG(dialog))) {
    printf("user clicked cancel\n");
    gtk_widget_destroy(dialog);
    return FALSE;
  }
  
  printf("user clicked ok\n");

  /* get role from dialog */
  char *ptr = NULL;

  if(GTK_IS_COMBO_BOX(entry))
    ptr = gtk_combo_box_get_active_text(GTK_COMBO_BOX(entry));
  else
    ptr = (char*)gtk_entry_get_text(GTK_ENTRY(entry));

  char *role = NULL;
  if(ptr && strlen(ptr)) role = g_strdup(ptr);

  gtk_widget_destroy(dialog);

  /* search end of member chain */
  member_t **memberP = &relation->member;
  while(*memberP) memberP = &(*memberP)->next;

  /* create new member */
  *memberP = g_new0(member_t, 1);
  (*memberP)->type = item->type;
  (*memberP)->role = role;
  switch(item->type) {
  case NODE:
    (*memberP)->node = item->node;
    break;
  case WAY:
    (*memberP)->way = item->way;
    break;
  case RELATION:
    (*memberP)->relation = item->relation;
    break;
  default:
    g_assert((item->type == NODE)||(item->type == WAY)||
             (item->type == RELATION));
    break;
  }

  relation->flags |= OSM_FLAG_DIRTY;
  return TRUE;
}

static void relation_remove_item(relation_t *relation, relation_item_t *item) {

  printf("remove item of type %d from relation #%ld\n", 
         item->type, relation->id);

  member_t **member = &relation->member;
  while(*member) {
    if(((*member)->type == item->type) &&
       (((item->type == NODE) && (item->node == (*member)->node)) ||
        ((item->type == WAY) && (item->way == (*member)->way)) ||
      ((item->type == RELATION) && (item->relation == (*member)->relation)))) {
      
      member_t *next = (*member)->next;
      osm_member_free(*member);
      *member = next;

      relation->flags |= OSM_FLAG_DIRTY;

      return;
    } else
      member = &(*member)->next;
  }
  g_assert(0);
}

static void relation_item_list_selected(relitem_context_t *context, 
                                   gboolean selected) {

  list_button_enable(context->list, LIST_BUTTON_REMOVE, selected);
  list_button_enable(context->list, LIST_BUTTON_EDIT, selected);
}

/* try to find something descriptive */
static char *relation_get_descriptive_name(relation_t *relation) {
  char *name = osm_tag_get_by_key(relation->tag, "ref");
  if (!name)
    name = osm_tag_get_by_key(relation->tag, "name");
  if (!name)
    name = osm_tag_get_by_key(relation->tag, "note");
  if (!name)
    name = osm_tag_get_by_key(relation->tag, "fix" "me");
  return name;
}

static gboolean relation_info_dialog(GtkWidget *parent, appdata_t *appdata, 
                                     relation_t *relation) {

  object_t object = { .type = RELATION };
  object.relation = relation;
  return info_dialog(parent, appdata, &object);
} 

static void on_relation_item_add(GtkWidget *but, relitem_context_t *context) {
  /* create a new relation */

  relation_t *relation = osm_relation_new();
  if(!relation_info_dialog(context->dialog, context->appdata, relation)) {
    printf("tag edit cancelled\n");
    osm_relation_free(relation);
  } else {
    osm_relation_attach(context->appdata->osm, relation);

    /* add to list */

    /* append a row for the new data */
    char *name = relation_get_descriptive_name(relation);

    GtkTreeIter iter;
    gtk_list_store_append(context->store, &iter);
    gtk_list_store_set(context->store, &iter,
                       RELITEM_COL_SELECTED, FALSE,
                       RELITEM_COL_TYPE, 
                       osm_tag_get_by_key(relation->tag, "type"),
                       RELITEM_COL_NAME, name,
                       RELITEM_COL_DATA, relation,
                       -1);

    gtk_tree_selection_select_iter(list_get_selection(context->list), &iter);
  }
}

static relation_t *get_selection(relitem_context_t *context) {
  GtkTreeSelection *selection;
  GtkTreeModel     *model;
  GtkTreeIter       iter;

  selection = list_get_selection(context->list);
  if(gtk_tree_selection_get_selected(selection, &model, &iter)) {
    relation_t *relation;
    gtk_tree_model_get(model, &iter, RELITEM_COL_DATA, &relation, -1);
    return(relation);
  }
  return NULL;
}

static void on_relation_item_edit(GtkWidget *but, relitem_context_t *context) {
  relation_t *sel = get_selection(context);
  if(!sel) return;

  printf("edit relation item #%ld\n", sel->id);

  if (!relation_info_dialog(context->dialog, context->appdata, sel))
    return;

  // Locate the changed item
  GtkTreeIter iter;
  gboolean valid = gtk_tree_model_get_iter_first(
    GTK_TREE_MODEL(context->store), &iter);
  while (valid) {
    relation_t *row_rel;
    gtk_tree_model_get(GTK_TREE_MODEL(context->store), &iter,
                       RELITEM_COL_DATA, &row_rel,
                       -1);
    if (row_rel == sel)
      break;
    valid = gtk_tree_model_iter_next(GTK_TREE_MODEL(context->store), &iter);
  }
  if (!valid)
    return;

  // Found it. Update all visible fields that belong to the relation iself.
  gtk_list_store_set(context->store, &iter,
    RELITEM_COL_TYPE,    osm_tag_get_by_key(sel->tag, "type"),
    RELITEM_COL_NAME,    relation_get_descriptive_name(sel),
    -1);

  // Order will probably have changed, so refocus
  list_focus_on(context->list, &iter, TRUE);
}

/* remove the selected relation */
static void on_relation_item_remove(GtkWidget *but, relitem_context_t *context) {
  relation_t *sel = get_selection(context);
  if(!sel) return;

  printf("remove relation #%ld\n", sel->id);

  gint members = osm_relation_members_num(sel);

  if(members) 
    if(!yes_no_f(context->dialog, NULL, 0, 0,
                 _("Delete non-empty relation?"), 
                 _("This relation still has %d members. "
                   "Delete it anyway?"), members))
      return;
  
  /* first remove selected row from list */
  GtkTreeIter       iter;
  GtkTreeSelection *selection = list_get_selection(context->list);
  if(gtk_tree_selection_get_selected(selection, NULL, &iter)) 
    gtk_list_store_remove(context->store, &iter);

  /* then really delete it */
  osm_relation_delete(context->appdata->osm, sel, FALSE); 

  relation_item_list_selected(context, FALSE);
}

static char *relitem_get_role_in_relation(relation_item_t *item, relation_t *relation) {
  member_t *member = relation->member;
  while(member) {
    switch(member->type) {

    case NODE:
      if((item->type == NODE) && (item->node == member->node))
        return member->role;
      break;

    case WAY:
      if((item->type == WAY) && (item->way == member->way))
        return member->role;
      break;

    default:
      break;
    }
    member = member->next;
  }
  return NULL;
}

static void
relitem_toggled(GtkCellRendererToggle *cell, const gchar *path_str,
                relitem_context_t *context) {
  GtkTreePath *path;
  GtkTreeIter iter;

  path = gtk_tree_path_new_from_string(path_str);
  gtk_tree_model_get_iter(GTK_TREE_MODEL(context->store), &iter, path);
  gtk_tree_path_free(path);

  /* get current enabled flag */
  gboolean enabled;
  relation_t *relation = NULL;
  gtk_tree_model_get(GTK_TREE_MODEL(context->store), &iter, 
                     RELITEM_COL_SELECTED, &enabled, 
                     RELITEM_COL_DATA, &relation, 
                     -1);

  list_pre_inplace_edit_tweak(GTK_TREE_MODEL(context->store));

  if(!enabled) {
    printf("will now become be part of this relation\n");
    if(relation_add_item(context->dialog, relation, context->item))
      gtk_list_store_set(context->store, &iter, 
                 RELITEM_COL_SELECTED, TRUE, 
                 RELITEM_COL_ROLE, 
                 relitem_get_role_in_relation(context->item, relation),
                 -1);
  } else {
    printf("item will not be part of this relation anymore\n");
    relation_remove_item(relation, context->item);
    gtk_list_store_set(context->store, &iter, 
                       RELITEM_COL_SELECTED, FALSE, 
                       RELITEM_COL_ROLE, NULL, 
                       -1);
  }

}

static gboolean relitem_is_in_relation(relation_item_t *item, relation_t *relation) {
  member_t *member = relation->member;
  while(member) {
    switch(member->type) {

    case NODE:
      if((item->type == NODE) && (item->node == member->node))
        return TRUE;
      break;

    case WAY:
      if((item->type == WAY) && (item->way == member->way))
        return TRUE;
      break;

    default:
      break;
    }
    member = member->next;
  }
  return FALSE;
}

static GtkWidget *relation_item_list_widget(relitem_context_t *context) {
  context->list = list_new(LIST_HILDON_WITH_HEADERS);

  list_set_columns(context->list, 
                   _(""), RELITEM_COL_SELECTED, LIST_FLAG_TOGGLE, 
                            G_CALLBACK(relitem_toggled), context,
                   _("Type"), RELITEM_COL_TYPE, 0,
                   _("Role"), RELITEM_COL_ROLE, 0,
                   _("Name"), RELITEM_COL_NAME, LIST_FLAG_ELLIPSIZE,
                   NULL);

  /* build and fill the store */
  context->store = gtk_list_store_new(RELITEM_NUM_COLS, 
                G_TYPE_BOOLEAN, G_TYPE_STRING, G_TYPE_STRING, 
                G_TYPE_STRING, G_TYPE_POINTER);

  list_set_store(context->list, context->store);

  // Debatable whether to sort by the "selected" or the "Name" column by
  // default. Both are be useful, in different ways.
  gtk_tree_sortable_set_sort_column_id(GTK_TREE_SORTABLE(context->store),
                                       RELITEM_COL_NAME, GTK_SORT_ASCENDING);

  GtkTreeIter iter;
  relation_t *relation = context->appdata->osm->relation;
  while(relation) {
    /* try to find something descriptive */
    char *name = relation_get_descriptive_name(relation);

    /* Append a row and fill in some data */
    gtk_list_store_append(context->store, &iter);
    gtk_list_store_set(context->store, &iter,
       RELITEM_COL_SELECTED, relitem_is_in_relation(context->item, relation),
       RELITEM_COL_TYPE, osm_tag_get_by_key(relation->tag, "type"),
       RELITEM_COL_ROLE, relitem_get_role_in_relation(context->item, relation),
       RELITEM_COL_NAME, name,
       RELITEM_COL_DATA, relation,
       -1);
    
    relation = relation->next;
  }
  
  g_object_unref(context->store);

  list_set_static_buttons(context->list, G_CALLBACK(on_relation_item_add),
        G_CALLBACK(on_relation_item_edit),G_CALLBACK(on_relation_item_remove), 
        context);

  relation_item_list_selected(context, FALSE);

  return context->list;
}

void relation_add_dialog(appdata_t *appdata, relation_item_t *relitem) {
  relitem_context_t *context = g_new0(relitem_context_t, 1);
  map_t *map = appdata->map;
  g_assert(map);

  context->appdata = appdata;
  context->item = relitem;

  char *str = NULL;
  switch(relitem->type) {
  case NODE:
    str = g_strdup_printf(_("Relations for node #%ld"), relitem->node->id);
    break;
  case WAY:
    str = g_strdup_printf(_("Relations for way #%ld"), relitem->way->id);
    break;
  default:
    g_assert((relitem->type == NODE) || (relitem->type == WAY));
    break;
  }
  
  context->dialog = gtk_dialog_new_with_buttons(str,
        GTK_WINDOW(appdata->window), GTK_DIALOG_MODAL,
        GTK_STOCK_CLOSE, GTK_RESPONSE_CLOSE, 
        NULL);
  g_free(str);
  
  gtk_dialog_set_default_response(GTK_DIALOG(context->dialog), 
                                  GTK_RESPONSE_CLOSE);

  gtk_window_set_default_size(GTK_WINDOW(context->dialog),
                              LIST_OF_RELATIONS_DIALOG_WIDTH,
                              LIST_OF_RELATIONS_DIALOG_HEIGHT);
  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(context->dialog)->vbox),
                     relation_item_list_widget(context), TRUE, TRUE, 0);

  /* ----------------------------------- */

  gtk_widget_show_all(context->dialog);
  gtk_dialog_run(GTK_DIALOG(context->dialog));
  gtk_widget_destroy(context->dialog);

  g_free(context);
}

/* -------------------- global relation list ----------------- */

typedef struct {
  appdata_t *appdata;
  GtkWidget *dialog, *list, *show_btn;
  GtkListStore *store;
} relation_context_t;

enum {
  RELATION_COL_ID = 0,
  RELATION_COL_TYPE,
  RELATION_COL_NAME,
  RELATION_COL_MEMBERS,
  RELATION_COL_DATA,
  RELATION_NUM_COLS
};

static relation_t *get_selected_relation(relation_context_t *context) {
  GtkTreeSelection *selection;
  GtkTreeModel     *model;
  GtkTreeIter       iter;

  selection = list_get_selection(context->list);
  if(gtk_tree_selection_get_selected(selection, &model, &iter)) {
    relation_t *relation;
    gtk_tree_model_get(model, &iter, RELATION_COL_DATA, &relation, -1);
    return(relation);
  }
  return NULL;
}

static void relation_list_selected(relation_context_t *context, 
                                   relation_t *selected) {

  list_button_enable(context->list, LIST_BUTTON_USER0, 
                     (selected != NULL) && (selected->member != NULL));
  gtk_widget_set_sensitive(context->show_btn,
                     (selected != NULL) && (selected->member != NULL));

  list_button_enable(context->list, LIST_BUTTON_REMOVE, selected != NULL);
  list_button_enable(context->list, LIST_BUTTON_EDIT, selected != NULL);
}

static gboolean
relation_list_selection_func(GtkTreeSelection *selection, GtkTreeModel *model,
                     GtkTreePath *path, gboolean path_currently_selected,
                     gpointer userdata) {
  relation_context_t *context = (relation_context_t*)userdata;
  GtkTreeIter iter;
    
  if(gtk_tree_model_get_iter(model, &iter, path)) {
    g_assert(gtk_tree_path_get_depth(path) == 1);
    
    relation_t *relation = NULL;
    gtk_tree_model_get(model, &iter, RELATION_COL_DATA, &relation, -1);
    relation_list_selected(context, relation);
  }
  
  return TRUE; /* allow selection state to change */
}

typedef struct {
  relation_t *relation;
  GtkWidget *dialog, *view;
  GtkListStore *store;
} member_context_t;

enum {
  MEMBER_COL_TYPE = 0,
  MEMBER_COL_ID,
  MEMBER_COL_NAME,
  MEMBER_COL_ROLE,
  MEMBER_COL_REF_ONLY,
  MEMBER_COL_DATA,
  MEMBER_NUM_COLS
};

static gboolean
member_list_selection_func(GtkTreeSelection *selection, GtkTreeModel *model,
                     GtkTreePath *path, gboolean path_currently_selected,
                     gpointer userdata) {
  GtkTreeIter iter;
    
  if(gtk_tree_model_get_iter(model, &iter, path)) {
    g_assert(gtk_tree_path_get_depth(path) == 1);

    member_t *member = NULL;
    gtk_tree_model_get(model, &iter, MEMBER_COL_DATA, &member, -1);
    if(member && member->type < NODE_ID)
      return TRUE;
  }
  
  return FALSE;
}


static GtkWidget *member_list_widget(member_context_t *context) {
  GtkWidget *vbox = gtk_vbox_new(FALSE,3);
  context->view = gtk_tree_view_new();

  gtk_tree_selection_set_select_function(
         gtk_tree_view_get_selection(GTK_TREE_VIEW(context->view)), 
         member_list_selection_func, 
         context, NULL);

  /* --- "type" column --- */
  GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
  g_object_set(renderer, "foreground", "grey", NULL);
  gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(context->view),
        -1, _("Type"), renderer, "text", MEMBER_COL_TYPE,
        "foreground-set", MEMBER_COL_REF_ONLY,  NULL); 


  /* --- "id" column --- */
  renderer = gtk_cell_renderer_text_new();
  g_object_set(renderer, "foreground", "grey", NULL);
  gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(context->view),
        -1, _("Id"), renderer, "text", MEMBER_COL_ID,
        "foreground-set", MEMBER_COL_REF_ONLY, NULL); 

  /* --- "Name" column --- */
  renderer = gtk_cell_renderer_text_new();
  g_object_set(renderer, "foreground", "grey", NULL);
  g_object_set(renderer, "ellipsize", PANGO_ELLIPSIZE_END, NULL);
  GtkTreeViewColumn *column = 
    gtk_tree_view_column_new_with_attributes(_("Name"), renderer, 
                     "text", MEMBER_COL_NAME,
                     "foreground-set", MEMBER_COL_REF_ONLY,  NULL);
  gtk_tree_view_column_set_expand(column, TRUE);
  gtk_tree_view_insert_column(GTK_TREE_VIEW(context->view), column, -1);

  /* --- "role" column --- */
  renderer = gtk_cell_renderer_text_new();
  g_object_set(renderer, "foreground", "grey", NULL);
  gtk_tree_view_insert_column_with_attributes(GTK_TREE_VIEW(context->view),
        -1, _("Role"), renderer, "text", MEMBER_COL_ROLE,
        "foreground-set", MEMBER_COL_REF_ONLY, NULL); 

  /* build and fill the store */
  context->store = gtk_list_store_new(MEMBER_NUM_COLS, 
              G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, 
              G_TYPE_BOOLEAN, G_TYPE_POINTER);

  gtk_tree_view_set_model(GTK_TREE_VIEW(context->view), 
                          GTK_TREE_MODEL(context->store));

  GtkTreeIter iter;
  member_t *member = context->relation->member;
  while(member) {
    tag_t *tags = osm_object_get_tags(member->type, member->ptr);
    char *id = osm_id_string(member->type, member->ptr);

    /* try to find something descriptive */
    char *name = NULL;
    if(tags)
      name = osm_tag_get_by_key(tags, "name");

    /* Append a row and fill in some data */
    gtk_list_store_append(context->store, &iter);
    gtk_list_store_set(context->store, &iter,
       MEMBER_COL_TYPE, osm_type_string(member->type),
       MEMBER_COL_ID,   id,
       MEMBER_COL_NAME, name, 
       MEMBER_COL_ROLE, member->role,
       MEMBER_COL_REF_ONLY, member->type >= NODE_ID,
       MEMBER_COL_DATA, member,
       -1);

    g_free(id);
    member = member->next;
  }

  g_object_unref(context->store);

  /* put it into a scrolled window */
  GtkWidget *scrolled_window = gtk_scrolled_window_new(NULL, NULL);
  gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scrolled_window), 
                                 GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
  gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(scrolled_window), 
                                      GTK_SHADOW_ETCHED_IN);
  gtk_container_add(GTK_CONTAINER(scrolled_window), context->view);

  gtk_box_pack_start_defaults(GTK_BOX(vbox), scrolled_window);

  return vbox;
}

/* user clicked "members..." button in relation list */
static void on_relation_members(GtkWidget *but, relation_context_t *context) {
  member_context_t *mcontext = g_new0(member_context_t, 1);

  /* display members list */
  mcontext->relation = get_selected_relation(context);
  if(!mcontext->relation) return;

  char *str = osm_tag_get_by_key(mcontext->relation->tag, "name");
  if(!str) str = osm_tag_get_by_key(mcontext->relation->tag, "ref");
  if(!str)
    str = g_strdup_printf(_("Members of relation #%ld"),
                          mcontext->relation->id);
  else
    str = g_strdup_printf(_("Members of relation \"%s\""), str);

  mcontext->dialog = 
    gtk_dialog_new_with_buttons(str,
        GTK_WINDOW(context->dialog), GTK_DIALOG_MODAL,
        GTK_STOCK_CLOSE, GTK_RESPONSE_CLOSE, 
        NULL);
  g_free(str);
  
  gtk_dialog_set_default_response(GTK_DIALOG(mcontext->dialog), 
                                  GTK_RESPONSE_CLOSE);

  gtk_window_set_default_size(GTK_WINDOW(mcontext->dialog),
                              LIST_OF_MEMBERS_DIALOG_WIDTH,
                              LIST_OF_MEMBERS_DIALOG_HEIGHT);

  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(mcontext->dialog)->vbox),
                     member_list_widget(mcontext), TRUE, TRUE, 0);

  /* ----------------------------------- */

  gtk_widget_show_all(mcontext->dialog);
  gtk_dialog_run(GTK_DIALOG(mcontext->dialog));
  gtk_widget_destroy(mcontext->dialog);

  g_free(mcontext);
}

static void on_relation_add(GtkWidget *but, relation_context_t *context) {
  /* create a new relation */

  relation_t *relation = osm_relation_new();
  if(!relation_info_dialog(context->dialog, context->appdata, relation)) {
    printf("tag edit cancelled\n");
    osm_relation_free(relation);
  } else {
    osm_relation_attach(context->appdata->osm, relation);

    /* append a row for the new data */

    char *name = relation_get_descriptive_name(relation);

    guint num = osm_relation_members_num(relation);

    /* Append a row and fill in some data */
    GtkTreeIter iter;
    gtk_list_store_append(context->store, &iter);
    gtk_list_store_set(context->store, &iter,
                       RELATION_COL_ID, relation->id,
                       RELATION_COL_TYPE,
                       osm_tag_get_by_key(relation->tag, "type"),
                       RELATION_COL_NAME, name,
                       RELATION_COL_MEMBERS, num,
                       RELATION_COL_DATA, relation,
                       -1);

    gtk_tree_selection_select_iter(list_get_selection(context->list), &iter);

    /* scroll to end */
    //    GtkAdjustment *adj = gtk_scrolled_window_get_vadjustment();
    /* xyz */
  }
}

/* user clicked "edit..." button in relation list */
static void on_relation_edit(GtkWidget *but, relation_context_t *context) {
  relation_t *sel = get_selected_relation(context);
  if(!sel) return;

  printf("edit relation #%ld\n", sel->id);

  if (!relation_info_dialog(context->dialog, context->appdata, sel))
    return;

  // Locate the changed item
  GtkTreeIter iter;
  gboolean valid = gtk_tree_model_get_iter_first(
    GTK_TREE_MODEL(context->store), &iter);
  while (valid) {
    relation_t *row_rel;
    gtk_tree_model_get(GTK_TREE_MODEL(context->store), &iter,
                       RELATION_COL_DATA, &row_rel,
                       -1);
    if (row_rel == sel)
      break;
    valid = gtk_tree_model_iter_next(GTK_TREE_MODEL(context->store), &iter);
  }
  if (!valid)
    return;

  // Found it. Update all visible fields.
  gtk_list_store_set(context->store, &iter,
    RELATION_COL_ID,      sel->id,
    RELATION_COL_TYPE,    osm_tag_get_by_key(sel->tag, "type"),
    RELATION_COL_NAME,    relation_get_descriptive_name(sel),
    RELATION_COL_MEMBERS, osm_relation_members_num(sel),
    -1);

  // Order will probably have changed, so refocus
  list_focus_on(context->list, &iter, TRUE);
}


/* remove the selected relation */
static void on_relation_remove(GtkWidget *but, relation_context_t *context) {
  relation_t *sel = get_selected_relation(context);
  if(!sel) return;

  printf("remove relation #%ld\n", sel->id);

  gint members = osm_relation_members_num(sel);

  if(members) 
    if(!yes_no_f(context->dialog, NULL, 0, 0,
                 _("Delete non-empty relation?"), 
                 _("This relation still has %d members. "
                   "Delete it anyway?"), members))
      return;
  
  /* first remove selected row from list */
  GtkTreeIter       iter;
  GtkTreeSelection *selection = list_get_selection(context->list);
  if(gtk_tree_selection_get_selected(selection, NULL, &iter)) 
    gtk_list_store_remove(context->store, &iter);

  /* then really delete it */
  osm_relation_delete(context->appdata->osm, sel, FALSE); 

  relation_list_selected(context, NULL);
}

static GtkWidget *relation_list_widget(relation_context_t *context) {
  context->list = list_new(LIST_HILDON_WITH_HEADERS);

  list_set_selection_function(context->list, relation_list_selection_func, 
                              context);

  list_set_columns(context->list,
                   _("Id"),      RELATION_COL_ID, 0,
                   _("Type"),    RELATION_COL_TYPE, 0,
                   _("Name"),    RELATION_COL_NAME, LIST_FLAG_ELLIPSIZE,
                   _("Members"), RELATION_COL_MEMBERS, 0,
                   NULL);

  /* build and fill the store */
  context->store = gtk_list_store_new(RELATION_NUM_COLS, 
                G_TYPE_ITEM_ID_T, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_UINT, 
                G_TYPE_POINTER);

  list_set_store(context->list, context->store);

  // Sorting by ref/name by default is useful for places with lots of numbered
  // bus routes. Especially for small screens.
  gtk_tree_sortable_set_sort_column_id(GTK_TREE_SORTABLE(context->store),
                                       RELATION_COL_NAME, GTK_SORT_ASCENDING);
  
  GtkTreeIter iter;
  relation_t *relation = context->appdata->osm->relation;
  while(relation) {
    char *name = relation_get_descriptive_name(relation);

    guint num = osm_relation_members_num(relation);

    /* Append a row and fill in some data */
    gtk_list_store_append(context->store, &iter);
    gtk_list_store_set(context->store, &iter,
                       RELATION_COL_ID, relation->id,
                       RELATION_COL_TYPE,
                       osm_tag_get_by_key(relation->tag, "type"),
                       RELATION_COL_NAME, name,
                       RELATION_COL_MEMBERS, num,
                       RELATION_COL_DATA, relation,
                       -1);
    
    relation = relation->next;
  }
  
  g_object_unref(context->store);

  list_set_static_buttons(context->list, G_CALLBACK(on_relation_add),
     G_CALLBACK(on_relation_edit), G_CALLBACK(on_relation_remove), context);

  list_set_user_buttons(context->list, 
        LIST_BUTTON_USER0, _("Members..."), G_CALLBACK(on_relation_members),
        0);

  relation_list_selected(context, NULL);

  return context->list;
}

/* a global view on all relations */
void relation_list(appdata_t *appdata) {
  relation_context_t *context = g_new0(relation_context_t, 1);
  context->appdata = appdata;

  printf("relation list\n");
  
  context->dialog = 
    gtk_dialog_new_with_buttons(_("All relations"),
        GTK_WINDOW(appdata->window), GTK_DIALOG_MODAL,
        GTK_STOCK_CLOSE, GTK_RESPONSE_CLOSE, 
        NULL);
  
  gtk_dialog_set_default_response(GTK_DIALOG(context->dialog), 
                                  GTK_RESPONSE_CLOSE);

  gtk_window_set_default_size(GTK_WINDOW(context->dialog),
                              LIST_OF_RELATIONS_DIALOG_WIDTH,
                              LIST_OF_RELATIONS_DIALOG_HEIGHT);
  
  context->show_btn = gtk_dialog_add_button(GTK_DIALOG(context->dialog), 
                                            _("Select"), GTK_RESPONSE_HELP);

  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(context->dialog)->vbox),
                     relation_list_widget(context), TRUE, TRUE, 0);

  /* ----------------------------------- */


  gtk_widget_show_all(context->dialog);
  if(gtk_dialog_run(GTK_DIALOG(context->dialog)) == GTK_RESPONSE_HELP) {
    map_item_deselect(appdata);

    relation_t *sel = get_selected_relation(context);
    if(sel) map_relation_select(appdata, sel);
  }

  gtk_widget_destroy(context->dialog);
  g_free(context);
}


// vim:et:ts=8:sw=2:sts=2:ai