Thanks! 2010/1/13 Ben Pfaff <blp@xxxxxxxxxxxxxxx>: > frederico schardong <frede.sch@xxxxxxxxx> writes: > >> I'm confusing about the difference between event and signal. > > According to the GTK+ FAQ: > > First of all, Havoc Pennington gives a rather complete > description of the differences between events and signals in his > free book (two chapters can be found at > http://www106.pair.com/rhp/sample_chapters.html). > > Moreover, Havoc posted this to the gtk-list "Events are a stream > of messages received from the X server. They drive the Gtk main > loop; which more or less amounts to "wait for events, process > them" (not exactly, it is really more general than that and can > wait on many different input streams at once). Events are a > Gdk/Xlib concept." > > "Signals are a feature of GtkObject and its subclasses. They have > nothing to do with any input stream; really a signal is just a > way to keep a list of callbacks around and invoke them ("emit" > the signal). There are lots of details and extra features of > course. Signals are emitted by object instances, and are entirely > unrelated to the Gtk main loop. Conventionally, signals are > emitted "when something changes" about the object emitting the > signal." > > "Signals and events only come together because GtkWidget happens > to emit signals when it gets events. This is purely a > convenience, so you can connect callbacks to be invoked when a > particular widget receives a particular event. There is nothing > about this that makes signals and events inherently related > concepts, any more than emitting a signal when you click a button > makes button clicking and signals related concepts." > > -- > "Now I have to go wash my mind out with soap." > --Derick Siddoway > > _______________________________________________ > gtk-list mailing list > gtk-list@xxxxxxxxx > http://mail.gnome.org/mailman/listinfo/gtk-list > -- Thanks, Frederico Schardong, SOLIS - Open source solutions www.solis.coop.br Linux registered user #500582 _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
