Class method

GObjectObjectClassinstall_properties

Declaration

void
g_object_class_install_properties (
  GObjectClass* oclass,
  guint n_pspecs,
  GParamSpec** pspecs
)

Description

Installs new properties from an array of GParamSpecs.

All properties should be installed during the class initializer. It is possible to install properties after that, but doing so is not recommend, and specifically, is not guaranteed to be thread-safe vs. use of properties on the same type on other threads.

The property id of each property is the index of each GParamSpec in the pspecs array.

The property id of 0 is treated specially by GObject and it should not be used to store a GParamSpec.

This function should be used if you plan to use a static array of GParamSpecs and g_object_notify_by_pspec(). For instance, this class initialization:

enum {
  PROP_0, PROP_FOO, PROP_BAR, N_PROPERTIES
};

static GParamSpec *obj_properties[N_PROPERTIES] = { NULL, };

static void
my_object_class_init (MyObjectClass *klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);

  obj_properties[PROP_FOO] =
    g_param_spec_int ("foo", "Foo", "Foo",
                      -1, G_MAXINT,
                      0,
                      G_PARAM_READWRITE);

  obj_properties[PROP_BAR] =
    g_param_spec_string ("bar", "Bar", "Bar",
                         NULL,
                         G_PARAM_READWRITE);

  gobject_class->set_property = my_object_set_property;
  gobject_class->get_property = my_object_get_property;
  g_object_class_install_properties (gobject_class,
                                     N_PROPERTIES,
                                     obj_properties);
}

allows calling g_object_notify_by_pspec() to notify of property changes:

void
my_object_set_foo (MyObject *self, gint foo)
{
  if (self->foo != foo)
    {
      self->foo = foo;
      g_object_notify_by_pspec (G_OBJECT (self), obj_properties[PROP_FOO]);
    }
 }
Available since:2.26

Parameters

n_pspecs guint
 

The length of the GParamSpecs array.

pspecs An array of GParamSpec*
 

The GParamSpecs array defining the new properties.

 The length of the array is specified in the n_pspecs argument.
 The data is owned by the caller of the function.