Re: Making Signal For A Widget.

["Gustavo J. A. M. Carneiro" <gjc inescporto pt>]

A Ter, 2003-06-03 às 13:03, B. Souliotis escreveu:
> I would like to make a signal for a particular widget that will be 
> emmited when you press the
> first mouse button.
> I don't want to use the
> g_signal_connect(G_OBJECT(widget),"button_press_event",G_CALLBACK(callback),NULL);
> for the widget Because i want the callback to called only when i press 
> the First mouse button.
>
> So I would like to make something like "clicked" signal for the gtk_button.
> IN gtkbutton.c is called
> g_signal_new("clicked",....);
> but i don't undarstand how this signal is emmited only when the button 
> pressed.
> So can anyone tell me how you pass the events to g_signal_new that will 
> emmit the new signal.

        What you want to do is:
        1. register a new signal with signal_id = g_signal_new(...), but only
once per app!
        2. for each instance of the widget,
g_signal_connect(widget,"button_press_event", callback, NULL)
        3. In the 'callback' function, check if the first button has been
pressed..
        4. ..if so, g_signal_emit(signal_id, ...)

        Actually doing what I say becomes more complicated if you are not used
to such things.  Also, this is usually done by creating a new widget
class deriving from the first widget, but this is also a lot of work...
        Good luck.
-- 
Gustavo João Alves Marques Carneiro
<gjc inescporto pt> <gustavo users sourceforge net>