What means the Run First, Run Last and others in http://library.gnome.org/devel/gtk/unstable/GtkWidget.htm at Signals? 2010/1/13 frederico schardong <frede.sch@xxxxxxxxx>: > 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 > -- 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
