Adw – 1: Initialization
Description: Reference for Adw-1: 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;
    }