Vlad> It should be: gboolean draw_histogram (GtkWidget *widget,
Vlad> GdkEventExpose *event, gpointer user_data); i.e. it should accept 3
Vlad> params instead of two.
Like one pair of functions (basically) to set/get values on an object, this is
another area where Xt was designed correctly IMHO. In Xt, all callbacks have
the same 4 parameters. In GTK terms the prototype would be:
void (*callback)(GtkWidget *widget, GdkEvent *event,
gpointer call_data, gpointer client_data);
While coding, I find it convenient to have exactly the parameters I need for
callbacks, but I have a hard time remembering the parameters required for the
different callbacks. Even in my own widgets.
-----------------------------------------------------------------------------
Mark Leisher
Computing Research Lab Once you fully apprehend the vacuity of a
New Mexico State University life without struggle, you are equipped
Box 30001, Dept. 3CRL with the basic means of salvation.
Las Cruces, NM 88003 -- Tennessee Williams
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