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/******************************************************
*
* iemguts - implementation file
*
* copyleft (c) IOhannes m zmölnig
*
* 2008:forum::für::umläute:2008
*
* institute of electronic music and acoustics (iem)
*
******************************************************
*
* license: GNU General Public License v.2 (or later)
*
******************************************************/
/* this file implements some helperr functions for dealing with lists of
* objects (containing other objects)
*
* used for callbacks to enumerated objects without $0 tricks
*/
/*
* TODO: documentation
*/
#include "m_pd.h"
/* ------------------------- helper methods for callbacks ---------------------------- */
typedef struct _iemguts_objlist {
const t_pd*obj;
struct _iemguts_objlist*next;
} t_iemguts_objlist;
typedef struct _iemguts_canvaslist {
const t_pd*parent;
t_iemguts_objlist*obj;
struct _iemguts_canvaslist*next;
} t_iemguts_canvaslist;
static t_iemguts_canvaslist*s_canvaslist=0;
static t_iemguts_canvaslist*findCanvas(const t_pd*parent) {
t_iemguts_canvaslist*list=s_canvaslist;
if(0==parent || 0==list)
return 0;
for(list=s_canvaslist; list; list=list->next) {
if(parent == list->parent) {
return list;
}
}
return 0;
}
static t_iemguts_canvaslist*addCanvas(const t_pd*parent)
{
t_iemguts_canvaslist*list=findCanvas(parent);
if(!list) {
list=(t_iemguts_canvaslist*)getbytes(sizeof(t_iemguts_canvaslist));
list->parent=parent;
list->obj=0;
list->next=0;
if(0==s_canvaslist) {
/* new list */
s_canvaslist=list;
} else {
/* add to the end of existing list */
t_iemguts_canvaslist*dummy=s_canvaslist;
while(dummy->next)
dummy=dummy->next;
dummy->next = list;
}
}
return list;
}
static t_iemguts_objlist*objectsInCanvas(const t_pd*parent) {
t_iemguts_canvaslist*list=findCanvas(parent);
if(list)
return list->obj;
return 0;
}
static void addObjectToCanvas(const t_pd*parent, const t_pd*obj) {
t_iemguts_canvaslist*p=addCanvas(parent);
t_iemguts_objlist*list=0;
t_iemguts_objlist*entry=0;
if(!p || !obj)
return;
list=p->obj;
if(list&&obj==list->obj)
return;
while(list && list->next) {
if(obj==list->obj) /* obj already in list */
return;
list=list->next;
}
/* we are at the end of the list that does not contain obj yet, so add it */
entry=(t_iemguts_objlist*)getbytes(sizeof(t_iemguts_objlist));
entry->obj=obj;
entry->next=0;
if(list) {
list->next=entry;
} else {
p->obj=entry;
}
}
static void removeObjectFromCanvas(const t_pd*parent, const t_pd*obj) {
t_iemguts_canvaslist*p=findCanvas(parent);
t_iemguts_objlist*list=0, *last=0, *next=0;
if(!p || !obj)return;
list=p->obj;
if(!list)
return;
while(list && obj!=list->obj) {
last=list;
list=list->next;
}
if(!list) /* couldn't find this object */
return;
next=list->next;
if(last)
last->next=next;
else
p->obj=next;
freebytes((void*)list, sizeof(t_iemguts_objlist));
list=0;
}
static void removeObjectFromCanvases(const t_pd*obj) {
t_iemguts_canvaslist*parents=s_canvaslist;
while(parents) {
removeObjectFromCanvas(parents->parent, obj);
parents=parents->next;
}
}
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