SignalEmissionHook

A simple function pointer to get invoked when the signal is emitted.

Emission hooks allow you to tie a hook to the signal type, so that it will trap all emissions of that signal, from any object.

You may not attach these to signals created with the g_signal_no_hooks flag.

Parameters:

ihint	Signal invocation hint, see SignalInvocationHint.
param_values	the instance on which the signal was emitted, followed by the parameters of the emission.
data	user data associated with the hook.
n_param_values	the number of parameters to the function, including the instance on which the signal was emitted.

Returns:

whether it wants to stay connected. If it returns false, the signal hook is disconnected (and destroyed).