GTK4_GG_hack/main.c

#include <gtk/gtk.h>

static void print (GtkWidget *widget, gpointer data) {g_print (data);}

static void activate (GtkApplication *app, gpointer user_data) {
  GtkWidget *window;
  GtkWidget *grid;
  GtkWidget *button;

  window = gtk_application_window_new (app);
  gtk_window_set_title (GTK_WINDOW (window), "Window");

   grid = gtk_grid_new ();
   gtk_window_set_child (GTK_WINDOW (window), grid);

  button = gtk_button_new_with_label (" I ");
  g_signal_connect (button, "clicked", G_CALLBACK (print), "I'm n°1\n");
  gtk_grid_attach (GTK_GRID (grid), button, 0, 0, 1, 1);

  button = gtk_button_new_with_label (" II ");
  g_signal_connect (button, "clicked", G_CALLBACK (print), "I'm n°2\n");
  gtk_grid_attach (GTK_GRID (grid), button, 1, 0, 1, 1);

  button = gtk_button_new_with_label ("Quit");
  g_signal_connect (button, "clicked", G_CALLBACK (print), "bye !...\n");
  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_window_destroy), window);
  gtk_grid_attach (GTK_GRID (grid), button, 0, 1, 2, 1);

  gtk_window_present (GTK_WINDOW (window));
}

int
main (int    argc,
      char **argv)
{
  GtkApplication *app;
  int status;

  app = gtk_application_new ("org.gtk.example", G_APPLICATION_DEFAULT_FLAGS);
  g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
  status = g_application_run (G_APPLICATION (app), argc, argv);
  g_object_unref (app);

  return status;
}