GObjectSignalEmissionHook

gboolean
(* GSignalEmissionHook) (
  GSignalInvocationHint* ihint,
  guint n_param_values,
  const GValue* param_values,
  gpointer data
)

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.

`ihint`	`GSignalInvocationHint`
	Signal invocation hint, see `GSignalInvocationHint`.
	The data is owned by the caller of the function.
`n_param_values`	`guint`
	The number of parameters to the function, including the instance on which the signal was emitted.
`param_values`	An array of `GValue`
	The instance on which the signal was emitted, followed by the parameters of the emission.
	The length of the array is specified in the `n_param_values` argument.
	The data is owned by the caller of the function.
`data`	`gpointer`
	User data associated with the hook.
	The argument can be `NULL`.
	The data is owned by the caller of the function.

Returns:	`gboolean`
	Whether it wants to stay connected. If it returns `FALSE`, the signal hook is disconnected (and destroyed).