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/******************************************************
*
* propertybang - implementation file
*
* copyleft (c) IOhannes m zmölnig
*
* 2007:forum::für::umläute:2007
*
* 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 "iemguts-objlist.h"
#include "g_canvas.h"
/* ------------------------- helper methods for savefunctions ---------------------------- */
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;
}
}
}
/* ------------------------- savefunctions ---------------------------- */
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_bangem(t_iemguts_objlist*objs, int pst);
static void savebangs_savefn(t_gobj*z, t_binbuf*b) {
/* z is the parent abstraction;
* we maintain a list of all [savebangs] within such each parent, in order to call all of them
*/
t_iemguts_objlist*obj=objectsInCanvas((t_pd*)z);
savebangs_bangem(obj, 0);
orig_savefn(z, b);
savebangs_bangem(obj, 1);
}
/* ------------------------- savebangs ---------------------------- */
static t_class *savebangs_class;
typedef struct _savebangs
{
t_object x_obj;
t_outlet *x_pre, *x_post;
t_canvas *x_parent;
} t_savebangs;
static void savebangs_bangs(t_savebangs*x, int pst)
{
if(!pst)
outlet_bang(x->x_pre);
else
outlet_bang(x->x_post);
}
static void savebangs_bangem(t_iemguts_objlist*objs, int pst) {
while(objs) {
t_savebangs*x=(t_savebangs*)objs->obj;
savebangs_bangs(x, pst);
objs=objs->next;
}
}
static void savebangs_mysavefn(t_gobj*z, t_binbuf*b) {
t_savebangs*x=(t_savebangs*)z;
int doit=(!x->x_parent);
if(doit)savebangs_bangs(x, 0);
orig_savefn(z, b);
if(doit)savebangs_bangs(x, 1);
}
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;
if(depth) {
depth--;
while(depth && canvas) {
canvas=canvas->gl_owner;
depth--;
}
if(canvas) {
class=((t_gobj*)canvas)->g_pd;
add_savefn(class);
class_setsavefn(class, savebangs_savefn);
x->x_parent=canvas;
} else {
x->x_parent=0;
}
addObjectToCanvas((t_pd*)canvas, (t_pd*)x);
}
x->x_post=outlet_new(&x->x_obj, &s_bang);
x->x_pre=outlet_new(&x->x_obj, &s_bang);
return (x);
}
static void savebangs_free(t_savebangs *x)
{
/* unpatch the parent canvas */
removeObjectFromCanvases((t_pd*)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);
add_savefn(savebangs_class);
class_setsavefn(savebangs_class, savebangs_mysavefn);
}
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