创建没有容器作为父对象的Gtk复合对象

#include <gtk/gtk.h>

typedef struct {
    GtkWidget *label;
    GtkWidget *button;
} CustomWidget;

static void custom_widget_init(CustomWidget *widget) {
    widget->label = gtk_label_new("Hello, Gtk!");
    widget->button = gtk_button_new_with_label("Click Me");

    // 创建一个GtkBin作为复合对象的父对象
    GtkWidget *bin = gtk_bin_new();
    gtk_container_add(GTK_CONTAINER(bin), widget->label);
    gtk_container_add(GTK_CONTAINER(bin), widget->button);

    // 将GtkBin作为复合对象
    gtk_widget_show_all(bin);
}

static void activate(GtkApplication *app, gpointer user_data) {
    CustomWidget widget;
    custom_widget_init(&widget);

    GtkWidget *window = gtk_application_window_new(app);
    gtk_window_set_title(GTK_WINDOW(window), "Custom Widget");
    gtk_window_set_default_size(GTK_WINDOW(window), 200, 200);
    gtk_container_add(GTK_CONTAINER(window), widget.label); // 这里直接使用label作为复合对象
    gtk_window_show_all(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;
}