Editing GObject (section)

==Messaging system==
The GObject messaging system consists of two complementary parts: ''closures'' and ''signals''.
; Closures : A GObject closure is a generalized version of a [[Callback (computer science)|callback]]. Support exists for closures written in C and C++, as well as arbitrary languages (when bindings are provided). This allows code written in (for example) Python and Java to be invoked via a GObject closure.
; Signals : Signals are the primary mechanism by which closures are invoked. Objects register signal listeners with the type system, specifying a mapping between a given signal and a given closure. Upon emission of a registered signal, that signal's closure is invoked. In GTK, all native GUI events (such as mouse motion and keyboard actions) can generate GObject signals for listeners to potentially act upon.