/* Test text tag's */
#include <gtk/gtk.h>

#define TAG_NAME "BOLD"

static void
setup_iters(GtkTextBuffer *buff, GtkTextIter *start, GtkTextIter *end)
{
  if (!gtk_text_buffer_get_selection_bounds(buff, start, end)) {
    GtkTextMark *mark = gtk_text_buffer_get_insert(buff);
    gtk_text_buffer_get_iter_at_mark(buff, start, mark);
    *end = *start;
  }
}

static void
activate_tag(GtkButton *button, GtkTextView *tv)
{
  GtkTextBuffer *buffer;
  GtkTextIter start, end;
  static gboolean tag_state = FALSE;

  tag_state = !tag_state;

  buffer = gtk_text_view_get_buffer(tv);
  setup_iters(buffer, &start, &end);

  if(tag_state) {
    g_print("Tag mode activated\n");
    gtk_text_buffer_apply_tag_by_name(buffer, TAG_NAME, &start, &end);
  }
  else {
    g_print("Tag mode deactivated\n");
    gtk_text_buffer_remove_tag_by_name(buffer, TAG_NAME, &start, &end);
  }
}

int main(int argc, char **argv)
{
  GtkWidget *main_window;
  GtkWidget *button;
  GtkWidget *vbox;
  GtkWidget *text_view;
  GtkTextBuffer *buffer;

  gtk_init(&argc, &argv);

  main_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_window_set_position(GTK_WINDOW(main_window), GTK_WIN_POS_CENTER);
  gtk_window_set_default_size(GTK_WINDOW(main_window), 250, 200);
  gtk_window_set_title(GTK_WINDOW(main_window), "Text tag's test");

  vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5);// gtk+ 3.0
//  vbox = gtk_vbox_new(FALSE, 0); // gtk+ 2.0
  gtk_container_add(GTK_CONTAINER(main_window), vbox);

  button = gtk_button_new_with_label("Tag activate");
  gtk_box_pack_start(GTK_BOX(vbox), button, FALSE, FALSE, 0);

  text_view = gtk_text_view_new();
  buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(text_view));
  gtk_text_buffer_create_tag(buffer, TAG_NAME, "weight", PANGO_WEIGHT_BOLD, NULL);
  gtk_box_pack_start(GTK_BOX(vbox), text_view, TRUE, TRUE, 0);

  g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(activate_tag), text_view);

  g_signal_connect(G_OBJECT(main_window), "destroy", G_CALLBACK(gtk_main_quit), NULL);

  gtk_widget_show_all(main_window);

  gtk_main();

  return 0;
}