#include <gtk/gtk.h>

/*Signal handler for the "clicked" signal of the Button. Each

click generates a progress bar pulse*/

static void

on_button_click (GtkButton *button,

                 gpointer   user_data)

{

  GtkProgressBar *progress_bar = user_data;

  gtk_progress_bar_pulse (progress_bar);

}

static void

activate (GtkApplication *app,

          gpointer        user_data)

{

  GtkWidget *grid;

  GtkWidget *window;

  GtkWidget *button;

  GtkWidget *progress_bar;

  /*Create the window and set a title*/

  window = gtk_application_window_new (app);

  gtk_window_set_title (GTK_WINDOW (window), "Grid Example");

  /*Create a button with a label*/

  button = gtk_button_new_with_label ("Button");

  /*Create the progress bar*/

  progress_bar = gtk_progress_bar_new ();

  /*Create a grid and attach the button and progress bar

  accordingly*/

  grid = gtk_grid_new ();

  gtk_grid_attach (GTK_GRID (grid), button, 1, 1, 1, 1);

  gtk_grid_attach_next_to (GTK_GRID (grid), 

                           progress_bar, 

                           button, 

                           GTK_POS_BOTTOM, 1, 1);

  /*Connecting the clicked signal to the callback function*/

  g_signal_connect (GTK_BUTTON (button), "clicked", 

                    G_CALLBACK (on_button_click), progress_bar);

  gtk_container_add (GTK_CONTAINER (window), GTK_WIDGET (grid));

  gtk_widget_show_all (window);

}

int

main (int argc, char **argv)

{

  GtkApplication *app;

  int status;

  app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE);

  g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);

  status = g_application_run (G_APPLICATION (app), argc, argv);

  g_object_unref (app);

  return status;

}