Re: [help-gv] view two pages?

[Jose E. Marchesi]

    > > There I do not know, but perhaps Jose (Marchesi, address@hidden, the gv
    > > maintainer) can help.
    > 
    > ok, so I'm waiting for hints :)
    > 
    > >     Would you accept a patch later for that?
    
    ok.. after tinkering with the code for few hours I understood why this
    feature has not been added. Adding it is very difficult, beacuse of the
    design :(

Both the design and the implementation of gv are old. It is almost a
"pure" X application. The set of widgets Xaw provides are quite
simple, and for use it you need to talk with the xt libs directly.
    
    There is one global variable "page".
    
    1. I tried to add another global variable "page2", but how to tell the
    widgets to place it in correct place, and the interpreter to render it...
    I could not find out.

The widgets placement (geometry manager) is controlled using a rather
exotic language interpreted by the xaw library. The programs written
in that languages are stored in X resources. For example (from
$prefix/lib/gv_class.ad): 

GV*fileSel*Clip*Aaa.layout:\
|v{\
  list<+[1]*>\
  0<+[1]>\
}

Another example is the $prefix/lib/gv_spartan.dat file, that contain
the layout of widgets used when using the --spartan command line
option. You could change the placement of the widgets without the need
of recompile gv changing the GV*control.layout resources and launching
the application again.