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/******************************************************
*
* canvasdelete - 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 deletes itself (or the specified parent canvas) when banged
*/
#include "m_pd.h"
#include "g_canvas.h"
/* ------------------------- canvasdelete ---------------------------- */
static t_class *canvasdelete_class;
typedef struct _canvasdelete
{
t_object x_obj;
t_glist*x_glist;
t_gobj *x_gobj;
t_clock *x_clock;
} t_canvasdelete;
static void canvasdelete_doit(t_canvasdelete *x)
{
int dspstate= canvas_suspend_dsp();
clock_free(x->x_clock);
x->x_clock=NULL;
glist_delete(x->x_glist, x->x_gobj);
canvas_resume_dsp(dspstate);
}
static void canvasdelete_bang(t_canvasdelete *x)
{
int x1=0, y1=0, width=0, height=0;
t_atom alist[2];
if(x->x_clock) {
pd_error(x, "deletion already scheduled");
return;
}
if(NULL==x->x_glist || NULL==x->x_gobj)return;
x->x_clock=clock_new(x, (t_method)canvasdelete_doit);
clock_delay(x->x_clock, 0);
}
static void *canvasdelete_new(t_floatarg f)
{
t_canvasdelete *x = (t_canvasdelete *)pd_new(canvasdelete_class);
t_glist *glist=(t_glist *)canvas_getcurrent();
t_canvas *canvas=(t_canvas*)glist_getcanvas(glist);
t_gobj*obj=(t_gobj*)x;
int depth=(int)f;
if(depth<0)depth=0;
while(depth && canvas) {
obj=(t_gobj*)canvas;
canvas=canvas->gl_owner;
depth--;
}
x->x_glist = canvas;
x->x_gobj=obj;
x->x_clock=NULL;
return (x);
}
static void canvasdelete_free(t_canvasdelete*x)
{
}
static void canvasdelete_canvasmethods(void);
void canvasdelete_setup(void)
{
canvasdelete_class = class_new(gensym("canvasdelete"),
(t_newmethod)canvasdelete_new, (t_method)canvasdelete_free,
sizeof(t_canvasdelete), 0,
A_DEFFLOAT, 0);
class_addbang(canvasdelete_class, (t_method)canvasdelete_bang);
canvasdelete_canvasmethods();
}
/* 'delete' message for the canvas */
static int canvas_delete_docb(t_glist*glist, int index) {
/* this will crash Pd if the object to be deleted is on the stack
* workarounds:
* - use a clock (see above)
* - finally fix this in Pd
*/
t_gobj*obj=NULL;
int i=index;
if(NULL==glist) {
return -1;
}
if(i<0) {
return -1;
}
obj=glist->gl_list;
while(i-- && obj) {
obj=obj->g_next;
}
if(obj) {
glist_delete(glist, obj);
}
else {
return -1;
}
return index;
}
static void canvas_delete_cb(t_canvas*x, t_symbol*s, int argc, t_atom*argv)
{
int dspstate= canvas_suspend_dsp();
if(argc) {
while(argc--){
canvas_delete_docb(x, atom_getint(argv++));
}
}
canvas_resume_dsp(dspstate);
}
static void canvasdelete_canvasmethods(void) {
if(NULL==canvas_class)return;
if(NULL==zgetfn(&canvas_class, gensym("delete"))) {
verbose(0, "adding 'delete' method to canvas");
class_addmethod(canvas_class, (t_method)canvas_delete_cb, gensym("delete"), A_GIMME, 0);
}
}
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