#include <gtk/gtk.h>

static void destroy (GtkWidget*, gpointer);
static void folder_changed (GtkFileChooser*, GtkFileChooser*);
static void file_changed (GtkFileChooser*, GtkLabel*);

int main (int argc, 
          char *argv[])
{
  GtkWidget *window, *chooser1, *chooser2, *label, *vbox;
  GtkFileFilter *filter1, *filter2;

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (window), "File Chooser Button");
  gtk_container_set_border_width (GTK_CONTAINER (window), 10);

  g_signal_connect (G_OBJECT (window), "destroy",
                    G_CALLBACK (destroy), NULL);

  label = gtk_label_new ("");
  
  /* Create two buttons, one to select a folder and one to select a file. */
  chooser1 = gtk_file_chooser_button_new ("Chooser a Folder",
                                          GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER);
  chooser2 = gtk_file_chooser_button_new ("Chooser a Folder",
                                          GTK_FILE_CHOOSER_ACTION_OPEN);

  /* Monitor when the selected folder or file are changed. */
  g_signal_connect (G_OBJECT (chooser1), "selection_changed",
                    G_CALLBACK (folder_changed),
                    (gpointer) chooser2);
  g_signal_connect (G_OBJECT (chooser2), "selection_changed",
                    G_CALLBACK (file_changed),
                    (gpointer) label);

  /* Set both file chooser buttons to the location of the user's home directory. */
  gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (chooser1), 
                                       g_get_home_dir());
  gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (chooser2), 
                                       g_get_home_dir());

  /* Provide a filter to show all files and one to shown only 3 types of images. */
  filter1 = gtk_file_filter_new ();
  filter2 = gtk_file_filter_new ();
  gtk_file_filter_set_name (filter1, "Image Files");
  gtk_file_filter_set_name (filter2, "All Files");
  gtk_file_filter_add_pattern (filter1, "*.png");
  gtk_file_filter_add_pattern (filter1, "*.jpg");
  gtk_file_filter_add_pattern (filter1, "*.gif");
  gtk_file_filter_add_pattern (filter2, "*");

  /* Add the both filters to the file chooser button that selects files. */
  gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser2), filter1);
  gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser2), filter2);

  vbox = gtk_vbox_new (FALSE, 5);
  gtk_box_pack_start_defaults (GTK_BOX (vbox), chooser1);
  gtk_box_pack_start_defaults (GTK_BOX (vbox), chooser2);
  gtk_box_pack_start_defaults (GTK_BOX (vbox), label);

  gtk_container_add (GTK_CONTAINER (window), vbox);
  gtk_widget_show_all (window);

  gtk_main ();
  return 0;
}

static void
destroy (GtkWidget *window,
         gpointer data)
{
  gtk_main_quit ();
}

/* When a folder is selected, use that as the new location of the other chooser. */
static void 
folder_changed (GtkFileChooser *chooser1, 
                GtkFileChooser *chooser2)
{
  gchar *folder = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (chooser1));
  gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (chooser2), folder);
}

/* When a file is selected, display the full path in the GtkLabel widget. */
static void 
file_changed (GtkFileChooser *chooser2, 
              GtkLabel *label)
{
  gchar *file = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (chooser2));
  gtk_label_set_text (label, file);
}