Signal

GObjectObject::notify

Declaration

void
notify (
  GObject* self,
  GObject.ParamSpec* pspec,
  gpointer user_data
)

Description

The notify signal is emitted on an object when one of its properties has its value set through g_object_set_property(), g_object_set(), et al.

Note that getting this signal doesn’t itself guarantee that the value of the property has actually changed. When it is emitted is determined by the derived GObject class. If the implementor did not create the property with G_PARAM_EXPLICIT_NOTIFY, then any call to g_object_set_property() results in ::notify being emitted, even if the new value is the same as the old. If they did pass G_PARAM_EXPLICIT_NOTIFY, then this signal is emitted only when they explicitly call g_object_notify() or g_object_notify_by_pspec(), and common practice is to do that only when the value has actually changed.

This signal is typically used to obtain change notification for a single property, by specifying the property name as a detail in the g_signal_connect() call, like this:

g_signal_connect (text_view->buffer, "notify::paste-target-list",
                  G_CALLBACK (gtk_text_view_target_list_notify),
                  text_view)

It is important to note that you must use [canonical parameter names][canonical-parameter-names] as detail strings for the notify signal.

Default handler:

The default handler is called before the handlers added via g_signal_connect().

Signal emission will restart instead of recursing
The signal can be emitted directly
The signal can be detailed
Hooks are disabled for this signal

Parameters

pspec GParamSpec
 

The GParamSpec of the property which changed.

 The data is owned by the caller of the function.