The GSignalInvocationHint structure is used to pass on additional information to callbacks during a signal emission.
The detail passed on for this emission
The stage the signal emission is currently in, this field will contain one of G_SIGNAL_RUN_FIRST, G_SIGNAL_RUN_LAST or G_SIGNAL_RUN_CLEANUP.
The signal id of the signal invoking the callback
The GSignalInvocationHint structure is used to pass on additional information to callbacks during a signal emission.