/* This file contains callback functions and some helper functions   for the Gnome/Gtk+ CD application */#include "app_gnome.h"extern GtkWidget *treeview;extern GtkWidget *app;extern GtkWidget *appbar;extern GtkWidget *artist_entry;extern GtkWidget *title_entry;extern GtkWidget *catalogue_entry;GtkWidget *addcd_dialog;void quit_app( GtkWidget * window, gpointer data){  database_end();  gtk_main_quit();}gint confirm_exit(){  gint result;  GtkWidget * dialog = gtk_message_dialog_new (NULL,                                  GTK_DIALOG_MODAL,                                  GTK_MESSAGE_QUESTION,                                  GTK_BUTTONS_YES_NO,                                  "Are you sure you want to quit?");  result = gtk_dialog_run (GTK_DIALOG (dialog));  gtk_widget_destroy (dialog);  return (result == GTK_RESPONSE_YES);}gboolean delete_event_handler ( GtkWidget *window, GdkEvent *event, gpointer data){  return !confirm_exit();}void addcd_dialog_button_clicked (GtkDialog * dialog, gint response, gpointer userdata){  const gchar *artist_const;  const gchar *title_const;  const gchar *catalogue_const;  gchar artist[200];  gchar title[200];  gchar catalogue[200];  gint *cd_id;  if (response == GTK_RESPONSE_ACCEPT)  {    artist_const = gtk_entry_get_text(GTK_ENTRY (artist_entry));    title_const =  gtk_entry_get_text(GTK_ENTRY (title_entry));    catalogue_const = gtk_entry_get_text(GTK_ENTRY (catalogue_entry));    strcpy(artist, artist_const);    strcpy(title, title_const);    strcpy(catalogue, catalogue_const);        add_cd(artist, title, catalogue, cd_id);  }  addcd_dialog = NULL;  gtk_widget_destroy(GTK_WIDGET(dialog));}/* This is the heart of the application - When we click on search, we   fetch matching cds and their tracks, and display using the GtkTreeView */void on_search_button_clicked  (GtkButton *button, gpointer userdata){  struct cd_search_st cd_res;  struct current_cd_st cd;  struct current_tracks_st ct;  gint res1, res2, res3;  gchar track_title[110];  const gchar *search_string_const;  gchar search_string[200];  gchar search_text[200];  gint i = 0, j = 0;  GtkTreeStore *tree_store;  GtkTreeIter parent_iter, child_iter;  memset(&track_title, 0, sizeof(track_title));  /* Get the search string, and copy into a non-const pointer */  search_string_const = gtk_entry_get_text(GTK_ENTRY (userdata));  strcpy (search_string, search_string_const);  /* Fetch matching cds */  res1 = find_cds(search_string, &cd_res);  /* Update the appbar to display the search results */  sprintf(search_text, " Displaying %d result(s) for search string ' %s '",          MIN(res1, MAX_CD_RESULT), search_string);  gnome_appbar_push (GNOME_APPBAR( appbar), search_text);  tree_store = gtk_tree_store_new (N_COLUMNS,                                   G_TYPE_STRING,                                   G_TYPE_STRING,                                   G_TYPE_STRING);                                     /* Fetch the cd detail for each matching cd and get the tracks */                                    while (i < res1 && i < MAX_CD_RESULT)  {     res2 = get_cd(cd_res.cd_id[i], &cd);      /* Add a new row to the model */      gtk_tree_store_append (tree_store, &parent_iter, NULL);      gtk_tree_store_set (tree_store, &parent_iter,                          COLUMN_TITLE, cd.title,                          COLUMN_ARTIST, cd.artist_name,                          COLUMN_CATALOGUE, cd.catalogue, -1                          );     res3 = get_cd_tracks(cd_res.cd_id[i++], &ct);     j = 0;     /* Populate the tree with the current cd's tracks */     while (j < res3)     {       sprintf(track_title, " Track %d. ", j+1);       strcat(track_title, ct.track[j++]);       gtk_tree_store_append (tree_store, &child_iter, &parent_iter);       gtk_tree_store_set (tree_store, &child_iter,                          COLUMN_TITLE, track_title, -1);     }   }  gtk_tree_view_set_model (GTK_TREE_VIEW (treeview), GTK_TREE_MODEL(tree_store));}void on_addcd_activate (GtkMenuItem * menuitem, gpointer user_data){  /* Check to see if we have already created dialog */  if (addcd_dialog != NULL)      return;  addcd_dialog = create_addcd_dialog();  gtk_widget_show_all (addcd_dialog);}gboolean close_app ( GtkWidget * window, gpointer data){  gboolean exit;  if ((exit = confirm_exit()))  {    quit_app(NULL, NULL);  }  return exit;}void on_quit_activate (GtkMenuItem  * menuitem, gpointer user_data){  close_app(NULL, NULL);}void on_about_activate (GtkMenuItem  * menuitem, gpointer user_data){  const char * authors[] = {"Wrox Press", NULL};  GtkWidget *about = gnome_about_new ("CD Database", "1.0",                                      "(c) Wrox Press",                                      "Beginning Linux Programming",                                      (const char ** ) authors, NULL,                                      "Translators", NULL);  gtk_widget_show(about);}