GObject-2.0 ▶ GObject ▶ signal_accumulator_true_handledSince 2.4

A predefined GObject.SignalAccumulator for signals that return a boolean values. The behavior that this accumulator gives is that a return of true stops the signal emission: no further callbacks will be invoked, while a return of false allows the emission to continue. The idea here is that a true return indicates that the callback handled the signal, and no further handling is needed.