GtkWidgetPath

GtkWidgetPath is a boxed type that represents a widget hierarchy from the topmost widget, typically a toplevel, to any child. This widget path abstraction is used in #GtkStyleContext on behalf of the real widget in order to query style information.

If you are using GTK+ widgets, you probably will not need to use this API directly, as there is gtk.widget.Widget.getPath, and the style context returned by gtk.widget.Widget.getStyleContext will be automatically updated on widget hierarchy changes.

The widget path generation is generally simple:

Defining a button within a window

{
  GtkWidgetPath *path;

  path = gtk_widget_path_new ();
  gtk_widget_path_append_type (path, GTK_TYPE_WINDOW);
  gtk_widget_path_append_type (path, GTK_TYPE_BUTTON);
}

Although more complex information, such as widget names, or different classes (property that may be used by other widget types) and intermediate regions may be included:

Defining the first tab widget in a notebook

{
  GtkWidgetPath *path;
  guint pos;

  path = gtk_widget_path_new ();

  pos = gtk_widget_path_append_type (path, GTK_TYPE_NOTEBOOK);
  gtk_widget_path_iter_add_region (path, pos, "tab", GTK_REGION_EVEN | GTK_REGION_FIRST);

  pos = gtk_widget_path_append_type (path, GTK_TYPE_LABEL);
  gtk_widget_path_iter_set_name (path, pos, "first tab label");
}

All this information will be used to match the style information that applies to the described widget.