Initialization
Initialization
Before using Libadwaita, it must be initialized. There are two ways of doing this.
Using AdwApplication (Recommended)
AdwApplication automatically initializes Libadwaita if used instead of
GtkApplication.
Example:
#include <adwaita.h>
static void
activate_cb (GtkApplication *app)
{
  GtkWidget *window = gtk_application_window_new (app);
  GtkWidget *label = gtk_label_new ("Hello World");
  gtk_window_set_title (GTK_WINDOW (window), "Hello");
  gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
  gtk_window_set_child (GTK_WINDOW (window), label);
  gtk_window_present (GTK_WINDOW (window));
}
int
main (int   argc,
      char *argv[])
{
  g_autoptr (AdwApplication) app = NULL;
  app = adw_application_new ("org.example.Hello", G_APPLICATION_FLAGS_NONE);
  g_signal_connect (app, "activate", G_CALLBACK (activate_cb), NULL);
  return g_application_run (G_APPLICATION (app), argc, argv);
}
After building and running, the application will look like this:
 
Using adw_init()
If using AdwApplication is not possible, use adw_init() instead. It can be
called instead of gtk_init().
Example:
#include <adwaita.h>
int
main (int   argc,
      char *argv[])
{
  GtkWidget *window, *label;
  adw_init ();
  window = gtk_window_new ();
  label = gtk_label_new ("Hello World");
  gtk_window_set_title (GTK_WINDOW (window), "Hello");
  gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
  gtk_window_set_child (GTK_WINDOW (window), label);
  gtk_window_present (GTK_WINDOW (window));
   while (g_list_model_get_n_items (gtk_window_get_toplevels ()) > 0)
    g_main_context_iteration (NULL, TRUE);
  return 0;
}