#include <gtk/gtk.h>

static void print_hello (GtkWidget *widget, gpointer   data){
  g_print ("Hello World\n");
}

static void activate (GtkApplication *app, gpointer  user_data){

  GtkWidget * window = gtk_application_window_new(app);
  gtk_window_set_title( GTK_WINDOW(window), "SOLARIS DAQ");
  gtk_window_set_default_size( GTK_WINDOW(window), 300, 200); // w, h

  GtkWidget * box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
  gtk_widget_set_halign(box, GTK_ALIGN_CENTER);
  gtk_widget_set_valign(box, GTK_ALIGN_CENTER);
  gtk_window_set_child( GTK_WINDOW(window), box);

  GtkWidget * button = gtk_button_new_with_label("Hello World");
  g_signal_connect( button, "clicked", G_CALLBACK(print_hello), NULL);
  g_signal_connect_swapped( button, "clicked", G_CALLBACK(gtk_window_destroy), window);
  gtk_box_append( GTK_BOX(box), button);

  gtk_widget_show(window);
}

int main (int argc, char **argv){

  GtkApplication * app = gtk_application_new("example.example", G_APPLICATION_FLAGS_NONE);
  g_signal_connect( app, "activate", G_CALLBACK(activate), NULL);
  int status = g_application_run( G_APPLICATION(app), argc, argv);
  g_object_unref( app);

  return status;
}