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/* Copyright (c) 1997-2000 Miller Puckette.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* a thing to forward messages from the GUI, dealing with race conditions
in which the "target" gets deleted while the GUI is sending it something.
*/
#include "m_pd.h"
#include "g_canvas.h"
struct _guiconnect
{
t_object x_obj;
t_pd *x_who;
t_symbol *x_sym;
t_clock *x_clock;
};
static t_class *guiconnect_class;
t_guiconnect *guiconnect_new(t_pd *who, t_symbol *sym)
{
t_guiconnect *x = (t_guiconnect *)pd_new(guiconnect_class);
x->x_who = who;
x->x_sym = sym;
pd_bind(&x->x_obj.ob_pd, sym);
return (x);
}
/* cleanup routine; delete any resources we have */
static void guiconnect_free(t_guiconnect *x)
{
if (x->x_sym)
pd_unbind(&x->x_obj.ob_pd, x->x_sym);
if (x->x_clock)
clock_free(x->x_clock);
}
/* this is called when the clock times out to indicate the GUI should
be gone by now. */
static void guiconnect_tick(t_guiconnect *x)
{
pd_free(&x->x_obj.ob_pd);
}
/* the target calls this to disconnect. If the gui has "signed off"
we're ready to delete the object; otherwise we wait either for signoff
or for a timeout. */
void guiconnect_notarget(t_guiconnect *x, double timedelay)
{
if (!x->x_sym)
pd_free(&x->x_obj.ob_pd);
else
{
x->x_who = 0;
if (timedelay > 0)
{
x->x_clock = clock_new(x, (t_method)guiconnect_tick);
clock_delay(x->x_clock, timedelay);
}
}
}
/* the GUI calls this to send messages to the target. */
static void guiconnect_anything(t_guiconnect *x,
t_symbol *s, int ac, t_atom *av)
{
if (x->x_who)
typedmess(x->x_who, s, ac, av);
}
/* the GUI calls this when it disappears. (If there's any chance the
GUI will fail to do this, the "target", when it signs off, should specify
a timeout after which the guiconnect will disappear.) */
static void guiconnect_signoff(t_guiconnect *x)
{
if (!x->x_who)
pd_free(&x->x_obj.ob_pd);
else
{
pd_unbind(&x->x_obj.ob_pd, x->x_sym);
x->x_sym = 0;
}
}
void g_guiconnect_setup(void)
{
guiconnect_class = class_new(gensym("guiconnect"), 0,
(t_method)guiconnect_free, sizeof(t_guiconnect), CLASS_PD, 0);
class_addanything(guiconnect_class, guiconnect_anything);
class_addmethod(guiconnect_class, (t_method)guiconnect_signoff,
gensym("signoff"), 0);
}
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