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/******************************************************
*
* propertybang - implementation file
*
* copyleft (c) IOhannes m zm-bölnig-A
*
* 2007:forum::f-bür::umläute:2007-A
*
* institute of electronic music and acoustics (iem)
*
******************************************************
*
* license: GNU General Public License v.2
*
******************************************************/
/*
* this object outputs a bang when the savfn of the parent abstraction is called
*/
/*
* LATER sketch:
* monkey-patching the parent canvas so that stores a local function table
* then modify this function-table so that the savefn points to us
* on call: we call the parents savefunction and output bangs
*/
/*
* TODO: how does this behave in sub-patches?
* -> BUG: the depth should _really_ refer to the abstraction-depth
* else we get weird duplicates (most likely due to the "$0" trick
*/
#include "m_pd.h"
#include "g_canvas.h"
/* ------------------------- help methods ---------------------------- */
typedef struct _savefuns {
t_class*class;
t_savefn savefn;
struct _savefuns *next;
} t_savefuns;
static t_savefuns*s_savefuns=0;
static t_savefn find_savefn(const t_class*class)
{
t_savefuns*fun=s_savefuns;
if(0==s_savefuns || 0==class)
return 0;
for(fun=s_savefuns; fun; fun=fun->next) {
if(class == fun->class) {
return fun->savefn;
}
}
return 0;
}
static void add_savefn(t_class*class)
{
if(0!=find_savefn(class)) {
return;
} else {
t_savefuns*sfun=(t_savefuns*)getbytes(sizeof(t_savefuns));
sfun->class=class;
sfun->savefn=class_getsavefn(class);
sfun->next=0;
if(0==s_savefuns) {
s_savefuns=sfun;
} else {
t_savefuns*sfp=s_savefuns;
while(sfp->next)
sfp=sfp->next;
sfp->next = sfun;
}
}
}
/* ------------------------- savebangs ---------------------------- */
static t_class *savebangs_class;
typedef struct _savebangs
{
t_object x_obj;
t_symbol *x_d0;
t_outlet *x_pre, *x_post;
t_savefn x_parentsavefn;
} t_savebangs;
static void savebangs_free(t_savebangs *x)
{
/* unpatch the parent canvas */
if(x->x_d0) {
pd_unbind(&x->x_obj.ob_pd, x->x_d0);
}
}
static void orig_savefn(t_gobj*z, t_binbuf*b)
{
t_class*class=z->g_pd;
t_savefn savefn=find_savefn(class);
if(savefn) {
savefn(z, b);
}
}
static void savebangs_savefn(t_gobj*z, t_binbuf*b) {
/* argh: z is the abstraction! but we need to access ourselfs!
* we handle this by binding to a special symbol. e.g. "$0 savebangs"
* (we use the space between in order to make it hard for the ordinary user
* to use this symbol for other things...
*/
/* alternatively we could just search the abstraction for all instances of savebangs_class
* and bang these;
* but using the pd_bind-trick is simpler for now
* though not as sweet, as somebody could use our bind-symbol for other things...
*/
t_symbol*s_d0=canvas_realizedollar((t_canvas*)z, gensym("$0 savebangs"));
t_atom ap[2];
SETPOINTER(ap+0, (t_gpointer*)z);
SETPOINTER(ap+1, (t_gpointer*)b);
if(s_d0->s_thing) {
pd_list(s_d0->s_thing, &s_list, 2, ap);
} else {
orig_savefn(z, b);
}
}
static void savebangs_list(t_savebangs *x, t_symbol*s, int argc, t_atom*argv)
{
if(argv[0].a_type == A_POINTER && argv[1].a_type == A_POINTER) {
t_gobj *z =(t_gobj*) argv[0].a_w.w_gpointer;
t_binbuf*b =(t_binbuf*)argv[1].a_w.w_gpointer;
outlet_bang(x->x_pre);
orig_savefn(z, b);
outlet_bang(x->x_post);
}
}
static void *savebangs_new(t_floatarg f)
{
t_savebangs *x = (t_savebangs *)pd_new(savebangs_class);
t_glist *glist=(t_glist *)canvas_getcurrent();
t_canvas *canvas=(t_canvas*)glist_getcanvas(glist);
t_class *class = 0;
int depth=(int)f;
if(depth<0)depth=0;
while(depth && canvas) {
canvas=canvas->gl_owner;
depth--;
}
if(canvas) {
class=((t_gobj*)canvas)->g_pd;
x->x_d0=canvas_realizedollar(canvas, gensym("$0 savebangs"));
pd_bind(&x->x_obj.ob_pd, x->x_d0);
add_savefn(class);
class_setsavefn(class, savebangs_savefn);
} else {
x->x_d0=0;
}
x->x_pre=outlet_new(&x->x_obj, &s_bang);
x->x_post=outlet_new(&x->x_obj, &s_bang);
return (x);
}
void savebangs_setup(void)
{
savebangs_class = class_new(gensym("savebangs"), (t_newmethod)savebangs_new,
(t_method)savebangs_free, sizeof(t_savebangs), CLASS_NOINLET, A_DEFFLOAT, 0);
class_addlist(savebangs_class, savebangs_list);
}
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