#include <gtk/gtk.h>

static void
expander_cb (GtkExpander *expander, GParamSpec *pspec, GtkWindow *dialog)
{
  gtk_window_set_resizable (dialog, gtk_expander_get_expanded (expander));
}

static void
response_cb (GtkDialog *dialog, gint response_id, gpointer data)
{
  gboolean *done = data;

  *done = TRUE;

  g_main_context_wakeup (NULL);
}

int
main (int argc, char *argv[])
{
  GtkWidget *dialog;
  GtkWidget *area;
  GtkWidget *expander;
  GtkWidget *sw;
  GtkWidget *tv;
  GtkTextBuffer *buffer;
  gboolean done = FALSE;

  gtk_init ();

  dialog = gtk_message_dialog_new_with_markup (NULL,
                       0,
                       GTK_MESSAGE_ERROR,
                       GTK_BUTTONS_CLOSE,
                       "<big><b>%s</b></big>",
                       "Something went wrong");
  gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog),
                                            "Here are some more details "
                                            "but not the full story.");

  area = gtk_message_dialog_get_message_area (GTK_MESSAGE_DIALOG (dialog));

  expander = gtk_expander_new ("Details:");
  sw = gtk_scrolled_window_new (NULL, NULL);
  gtk_scrolled_window_set_has_frame (GTK_SCROLLED_WINDOW (sw), TRUE);
  gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
                                  GTK_POLICY_NEVER,
                                  GTK_POLICY_AUTOMATIC);

  tv = gtk_text_view_new ();
  buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (tv));
  gtk_text_view_set_editable (GTK_TEXT_VIEW (tv), FALSE);
  gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (tv), GTK_WRAP_WORD);
  gtk_text_buffer_set_text (GTK_TEXT_BUFFER (buffer),
                            "Finally, the full story with all details. "
                            "And all the inside information, including "
                            "error codes, etc etc. Pages of information, "
                            "you might have to scroll down to read it all, "
                            "or even resize the window - it works !\n"
                            "A second paragraph will contain even more "
                            "innuendo, just to make you scroll down or "
                            "resize the window. Do it already !", -1);
  gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), tv);
  gtk_expander_set_child (GTK_EXPANDER (expander), sw);
  gtk_widget_set_hexpand (expander, TRUE);
  gtk_widget_set_vexpand (expander, TRUE);
  gtk_box_append (GTK_BOX (area), expander);
  g_signal_connect (expander, "notify::expanded",
                    G_CALLBACK (expander_cb), dialog);

  g_signal_connect (dialog, "response", G_CALLBACK (response_cb), &done);

  gtk_window_present (GTK_WINDOW (dialog));

  while (!done)
    g_main_context_iteration (NULL, TRUE);

  return 0;
}