#include <gtk/gtk.h>

int main()
{
    gtk_init(NULL, NULL);

    GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window), "Test");
    gtk_window_set_default_size(GTK_WINDOW(window), 400, 400);
    gtk_window_set_resizable(GTK_WINDOW(window), FALSE);

    GtkWidget *toolbar = gtk_toolbar_new();
    gtk_widget_set_halign(toolbar, GTK_ALIGN_FILL);
    gtk_widget_set_valign(toolbar, GTK_ALIGN_START);

    gtk_toolbar_insert(GTK_TOOLBAR(toolbar), gtk_tool_button_new(gtk_image_new_from_icon_name("view-left-pane", GTK_ICON_SIZE_SMALL_TOOLBAR), NULL), -1);
    gtk_toolbar_insert(GTK_TOOLBAR(toolbar), gtk_tool_button_new(gtk_image_new_from_icon_name("view-right-pane", GTK_ICON_SIZE_SMALL_TOOLBAR), NULL), -1);
    gtk_toolbar_insert(GTK_TOOLBAR(toolbar), gtk_tool_button_new(gtk_image_new_from_icon_name("go-home", GTK_ICON_SIZE_SMALL_TOOLBAR), NULL), -1);

    {
        GtkWidget *button = gtk_button_new_from_icon_name("view-left-pane", GTK_ICON_SIZE_SMALL_TOOLBAR);
        GtkToolItem *tool_item = gtk_tool_item_new();
        gtk_container_add(GTK_CONTAINER(tool_item), button);
        gtk_toolbar_insert(GTK_TOOLBAR(toolbar), tool_item, -1);

        button = gtk_button_new_from_icon_name("view-right-pane", GTK_ICON_SIZE_SMALL_TOOLBAR);
        tool_item = gtk_tool_item_new();
        gtk_container_add(GTK_CONTAINER(tool_item), button);
        gtk_toolbar_insert(GTK_TOOLBAR(toolbar), tool_item, -1);
    }

    gtk_container_add(GTK_CONTAINER(window), toolbar);

    g_signal_connect_swapped(window, "delete-event", G_CALLBACK(&gtk_main_quit), NULL);

    gtk_widget_show_all(window);

    gtk_main();
}