Signal detail or null (default)
signal callback delegate or function to connect
void callback(gobject.param_spec.ParamSpec pspec, gobject.object.ObjectG objectG)
pspec the #GParamSpec of the property which changed. (optional)
objectG the instance the signal is connected to (optional)
Yes.After to execute callback after default handler, No.After to execute before (default)
Signal ID
Connect to Notify signal.
The notify signal is emitted on an object when one of its properties has its value set through gobject.object.ObjectG.setProperty, gobject.object.ObjectG.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 gobject.object.ObjectG.setProperty 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 gobject.object.ObjectG.notify or gobject.object.ObjectG.notifyByPspec, 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.