#include <gtk/gtk.h>

typedef struct
{
  GtkWidget *entry, *textview;
} Widgets;

static void insert_text (GtkButton*, Widgets*);
static void retrieve_text (GtkButton*, Widgets*);

int main (int argc,
          char *argv[])
{
  GtkWidget *window, *scrolled_win, *hbox, *vbox, *insert, *retrieve;
  Widgets *w = g_slice_new (Widgets);
  
  gtk_init (&argc, &argv);
  
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (window), "Text Iterators");
  gtk_container_set_border_width (GTK_CONTAINER (window), 10);
  gtk_widget_set_size_request (window, -1, 200);
  
  g_signal_connect (G_OBJECT (window), "destroy",
                    G_CALLBACK (gtk_main_quit), NULL);
  
  w->textview = gtk_text_view_new ();
  w->entry = gtk_entry_new ();
  insert = gtk_button_new_with_label ("Insert Text");
  retrieve = gtk_button_new_with_label ("Get Text");

  g_signal_connect (G_OBJECT (insert), "clicked",
                    G_CALLBACK (insert_text),
                    (gpointer) w);
  g_signal_connect (G_OBJECT (retrieve), "clicked",
                    G_CALLBACK (retrieve_text),
                    (gpointer) w);
    
  scrolled_win = gtk_scrolled_window_new (NULL, NULL);
  gtk_container_add (GTK_CONTAINER (scrolled_win), w->textview);

  hbox = gtk_hbox_new (FALSE, 5);
  gtk_box_pack_start_defaults (GTK_BOX (hbox), w->entry);
  gtk_box_pack_start_defaults (GTK_BOX (hbox), insert);
  gtk_box_pack_start_defaults (GTK_BOX (hbox), retrieve);

  vbox = gtk_vbox_new (FALSE, 5);
  gtk_box_pack_start (GTK_BOX (vbox), scrolled_win, TRUE, TRUE, 0);
  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, TRUE, 0);
  
  gtk_container_add (GTK_CONTAINER (window), vbox);
  gtk_widget_show_all (window);
  
  gtk_main();
  return 0;
}

/* Insert the text from the GtkEntry into the GtkTextView. */
static void 
insert_text (GtkButton *button, 
             Widgets *w)
{
  GtkTextBuffer *buffer;
  GtkTextMark *mark;
  GtkTextIter iter;
  const gchar *text;

  buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (w->textview));
  text = gtk_entry_get_text (GTK_ENTRY (w->entry));

  mark = gtk_text_buffer_get_insert (buffer);
  gtk_text_buffer_get_iter_at_mark (buffer, &iter, mark);
  gtk_text_buffer_insert (buffer, &iter, text, -1);
}

/* Retrieve the selected text from the GtkTextView and display it
 * to the user. */
static void 
retrieve_text (GtkButton *button, 
               Widgets *w)
{
  GtkTextBuffer *buffer;
  GtkTextIter start, end;
  gchar *text;

  buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (w->textview));
  gtk_text_buffer_get_selection_bounds (buffer, &start, &end);
  text = gtk_text_buffer_get_text (buffer, &start, &end, FALSE);

  g_print ("%s\n", text);
}