signal callback delegate or function to connect
void callback(string arg1, string arg2, atk.object.ObjectAtk objectAtk)
arg1 the name of the attribute being modified, or null if not available. (optional)
arg2 the attribute's new value, or null if not available. (optional)
objectAtk 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 AttributeChanged signal.
The "attribute-changed" signal should be emitted when one of an object's attributes changes.