g_editor.c 254 KB
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/* Copyright (c) 2009-2013 Ivica Ico Bukvic and others. Code based on Pure-Data source

Original Pure-Data source copyright (c) 1997-2001 Miller Puckette and others.
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* For information on usage and redistribution, and for a DISCLAIMER OF ALL
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* WARRANTIES, see the file, "LICENSE.txt," in this distribution.

*/
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#include <stdlib.h>
#include <stdio.h>
#include "m_pd.h"
#include "m_imp.h"
#include "s_stuff.h"
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#include "g_magicglass.h"
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#include "g_canvas.h"
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#include "s_utf8.h" /*-- moo --*/
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#include "g_undo.h"
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#include "x_preset.h"
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#include <string.h>
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#include <math.h>
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#include "g_all_guis.h"
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void glist_readfrombinbuf(t_glist *x, t_binbuf *b, char *filename,
    int selectem);

void open_via_helppath(const char *name, const char *dir);
char *class_gethelpdir(t_class *c);

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//static int toggle_moving = 0; //global variable

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/* ------------------ forward declarations --------------- */
static void canvas_doclear(t_canvas *x);
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void glist_setlastxymod(t_glist *gl, int xval, int yval, int mod);
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void glist_setlastxy(t_glist *gl, int xval, int yval);
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static void glist_donewloadbangs(t_glist *x);
static t_binbuf *canvas_docopy(t_canvas *x);
static void canvas_dopaste(t_canvas *x, t_binbuf *b);
static void canvas_paste(t_canvas *x);
static void canvas_clearline(t_canvas *x);
static t_binbuf *copy_binbuf;
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//static char *canvas_textcopybuf;
//static int canvas_textcopybufsize;
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static t_glist *glist_finddirty(t_glist *x);
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static void canvas_reselect(t_canvas *x);
static void canvas_cut(t_canvas *x);
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//static void canvas_undo(t_canvas *x);
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static int paste_xyoffset = 0; /* a counter of pastes to make x,y offsets */
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//static void canvas_mouseup_gop(t_canvas *x, t_gobj *g);
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static void canvas_done_popup(t_canvas *x, t_float which, t_float xpos,
    t_float ypos);
static void canvas_doarrange(t_canvas *x, t_float which, t_gobj *oldy,
    t_gobj *oldy_prev, t_gobj *oldy_next);
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static void canvas_paste_xyoffset(t_canvas *x);
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void canvas_setgraph(t_glist *x, int flag, int nogoprect);
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void canvas_mouseup(t_canvas *x, t_floatarg fxpos, t_floatarg fypos,
    t_floatarg fwhich);
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static int outlet_issignal = 0;
static int inlet_issignal = 0;
static int last_inlet_filter = 0;
static int last_outlet_filter = 0;
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static int copyfromexternalbuffer = 0;
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static int tooltips = 0;
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static int objtooltip = 0;
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static int screenx1; /* screen coordinates when doing copyfromexternalbuffer */
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static int screeny1;
static int screenx2;
static int screeny2;
static int copiedfont;
static void canvas_dofont(t_canvas *x, t_floatarg font, t_floatarg xresize,
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    t_floatarg yresize);
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extern void canvas_setbounds(t_canvas *x, int x1, int y1, int x2, int y2);
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int canvas_apply_restore_original_position(t_canvas *x, int orig_pos);
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extern void canvas_draw_gop_resize_hooks(t_canvas *x);
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static void canvas_font(t_canvas *x, t_floatarg font, t_floatarg oldfont,
    t_floatarg resize, t_floatarg preview);
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void canvas_displaceselection(t_canvas *x, int dx, int dy);
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void canvas_motion(t_canvas *x, t_floatarg xpos, t_floatarg ypos,
    t_floatarg fmod);
/* for updating preset_node locations in case of operations that alter
   glist object locations (tofront/back, cut, delete, undo/redo cut/delete) */
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extern void glob_preset_node_list_check_loc_and_update(void);
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// for preset_node
extern t_class *text_class;
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int do_not_redraw = 0;     // used to optimize redrawing
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int old_displace = 0;      // for legacy displaces within gop that are not
                           // visible to displaceselection
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/* used when autopatching to bypass check whether one is trying to
   connect signal with non-signal nlet since this is impossible to
   figure out when the newly created object is an empty one */
int connect_exception = 0;
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/* used to test whether the shift is pressed and if so,
   handle various connection exceptions (e.g. multiconnect) */
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int glob_lmclick = 0;
int glob_shift = 0;
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int glob_ctrl = 0;
int glob_alt = 0;

static t_glist *canvas_last_glist;
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static int canvas_last_glist_x=20, canvas_last_glist_y=20, canvas_last_glist_mod;
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struct _outlet
{
    t_object *o_owner;
    struct _outlet *o_next;
    t_outconnect *o_connections;
    t_symbol *o_sym;
};

/* used for new duplicate behavior where we can "duplicate" into new window */
static t_canvas *c_selection;

/* iemgui uses black inlets and outlets while default objects use gray ones
   add here more as necessary */
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int gobj_filter_highlight_behavior(t_text *y)
{
    return (y->te_iemgui);
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}
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/* ---------------- mathieu 2014.08 --------------------------------- */

void canvas_raise_all_cords (t_canvas *x) {
    sys_vgui(".x%lx.c raise all_cords\n", x);
}
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static void canvas_enteritem (t_canvas *x, int xpos, int ypos, const char *tag) {
    sys_vgui("pdtk_canvas_enteritem .x%x.c %d %d %s -1\n",
        x, xpos, ypos, tag);
}
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static void canvas_leaveitem (t_canvas *x) {
    sys_vgui("pdtk_canvas_leaveitem .x%x.c\n", x);
}
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static void tooltip_erase (t_canvas *x) {
    if (objtooltip) {
        objtooltip = 0;
        canvas_leaveitem(x);
    }
}
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static void canvas_nlet_conf (t_canvas *x, int type) {
    int filter = type=='o' ? last_outlet_filter : last_inlet_filter;
    int issignal = type=='o' ? outlet_issignal : inlet_issignal;
    sys_vgui(".x%x.c itemconfigure %s -stroke %s -fill %s -strokewidth 1\n", x,
      type=='o' ? x->gl_editor->canvas_cnct_outlet_tag : x->gl_editor->canvas_cnct_inlet_tag,
      (filter ? "$pd_colors(iemgui_nlet)" : 
        (issignal ? "$pd_colors(signal_cord)" : "$pd_colors(control_cord)")),
        (issignal ? "$pd_colors(signal_nlet)" : "$pd_colors(control_nlet)"));
}
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/*static void canvas_nlet_conf2 (t_canvas *x, int cond) { // because of one exception...
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    int issignal = inlet_issignal;
    sys_vgui(".x%x.c itemconfigure %s -stroke %s -fill %s -strokewidth 1\n", x,
      x->gl_editor->canvas_cnct_inlet_tag,
      (last_inlet_filter ? "$pd_colors(iemgui_nlet)" : 
        (cond     ? "$pd_colors(signal_cord)" : "$pd_colors(control_cord)")),
        (issignal ? "$pd_colors(signal_nlet)" : "$pd_colors(control_nlet)"));
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}*/

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void canvas_getscroll (t_canvas *x) {
    sys_vgui("pdtk_canvas_getscroll .x%lx.c\n",(long)x);
}

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/* ---------------- generic widget behavior ------------------------- */

void gobj_getrect(t_gobj *x, t_glist *glist, int *x1, int *y1,
    int *x2, int *y2)
{
    if (x->g_pd->c_wb && x->g_pd->c_wb->w_getrectfn)
        (*x->g_pd->c_wb->w_getrectfn)(x, glist, x1, y1, x2, y2);
}

void gobj_displace(t_gobj *x, t_glist *glist, int dx, int dy)
{
    if (x->g_pd->c_wb && x->g_pd->c_wb->w_displacefn)
        (*x->g_pd->c_wb->w_displacefn)(x, glist, dx, dy);
}

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void gobj_displace_withtag(t_gobj *x, t_glist *glist, int dx, int dy)
{
    if (x->g_pd->c_wb && x->g_pd->c_wb->w_displacefnwtag)
        (*x->g_pd->c_wb->w_displacefnwtag)(x, glist, dx, dy);
}

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void gobj_select(t_gobj *x, t_glist *glist, int state)
{
    if (x->g_pd->c_wb && x->g_pd->c_wb->w_selectfn)
        (*x->g_pd->c_wb->w_selectfn)(x, glist, state);
}

void gobj_activate(t_gobj *x, t_glist *glist, int state)
{
    if (x->g_pd->c_wb && x->g_pd->c_wb->w_activatefn)
        (*x->g_pd->c_wb->w_activatefn)(x, glist, state);
}

void gobj_delete(t_gobj *x, t_glist *glist)
{
    if (x->g_pd->c_wb && x->g_pd->c_wb->w_deletefn)
        (*x->g_pd->c_wb->w_deletefn)(x, glist);
}

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int gobj_shouldvis(t_gobj *x, struct _glist *glist)
{
    t_object *ob;
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    //fprintf(stderr,"shouldvis %d %d %d %d\n",
    //    glist->gl_havewindow, glist->gl_isgraph,
    //    glist->gl_goprect, glist->gl_owner != NULL);
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    if (!glist->gl_havewindow && glist->gl_isgraph && glist->gl_goprect &&
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        glist->gl_owner && (pd_class(&x->g_pd) != scalar_class) &&
        (pd_class(&x->g_pd) != garray_class))
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    {
        /* if we're graphing-on-parent and the object falls outside the
        graph rectangle, don't draw it. */
        int x1, y1, x2, y2, gx1, gy1, gx2, gy2, m;
        gobj_getrect(&glist->gl_gobj, glist->gl_owner, &x1, &y1, &x2, &y2);
        if (x1 > x2)
            m = x1, x1 = x2, x2 = m;
        if (y1 > y2)
            m = y1, y1 = y2, y2 = m;
        gobj_getrect(x, glist, &gx1, &gy1, &gx2, &gy2);
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        //fprintf(stderr,
        //    "gobj_shouldvis gop: %d %d %d %d || object %d %d %d %d\n",
        //    x1, x2, y1, y2, gx1, gx2, gy1, gy2);
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        if (gx1 < x1 || gx1 > x2 || gx2 < x1 || gx2 > x2 ||
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            gy1 < y1 || gy1 > y2 || gy2 < y1 || gy2 > y2)
        {
                //fprintf(stderr,"does not fit within boundaries\n");
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                return (0);
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        }
        if (glist==glist_getcanvas(glist))
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            canvas_raise_all_cords(glist);
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    }
    if (ob = pd_checkobject(&x->g_pd))
    {
        /* return true if the text box should be drawn.  We don't show text
        boxes inside graphs---except comments, if we're doing the new
        (goprect) style. */
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        //fprintf(stderr,"pd_checkobject %lx\n", x);
        /*fprintf(stderr,"pd_checkobject %d %d %d %d %d %d %d\n",
            glist->gl_havewindow, 
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            (ob->te_pd != canvas_class ? 1:0),
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            (ob->te_pd->c_wb != &text_widgetbehavior ? 1:0),
            (ob->te_pd == canvas_class ? 1:0),
            ((t_glist *)ob)->gl_isgraph,
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            glist->gl_goprect,
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            (ob->te_type == T_TEXT ? 1:0));*/
        if (sys_k12_mode && x->g_pd == preset_hub_class)
        {
            //fprintf(stderr, "glist_select do not select invised preset_hub "
            //                "in K12 mode\n");
            t_preset_hub *ph = (t_preset_hub *)x;
            if (ph->ph_invis > 0) return(0);
        }
        /*fprintf(stderr,"checking %d\n", (glist->gl_havewindow ||
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            (ob->te_pd != canvas_class &&
                ob->te_pd->c_wb != &text_widgetbehavior) ||
            (ob->te_pd == canvas_class && (((t_glist *)ob)->gl_isgraph)) ||
            (glist->gl_goprect && (ob->te_type == T_TEXT))));*/
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        return (glist->gl_havewindow ||
            (ob->te_pd != canvas_class &&
                ob->te_pd->c_wb != &text_widgetbehavior) ||
            (ob->te_pd == canvas_class && (((t_glist *)ob)->gl_isgraph)) ||
            (glist->gl_goprect && (ob->te_type == T_TEXT)));
    }
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    else {
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        //fprintf(stderr,"else return 1\n");
        return (1);
    }
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}

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void gobj_vis(t_gobj *x, struct _glist *glist, int flag)
{
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    if (do_not_redraw) return;
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    if (x->g_pd->c_wb && x->g_pd->c_wb->w_visfn && gobj_shouldvis(x, glist))
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        (*x->g_pd->c_wb->w_visfn)(x, glist, flag);
}

int gobj_click(t_gobj *x, struct _glist *glist,
    int xpix, int ypix, int shift, int alt, int dbl, int doit)
{
    if (x->g_pd->c_wb && x->g_pd->c_wb->w_clickfn)
        return ((*x->g_pd->c_wb->w_clickfn)(x,
            glist, xpix, ypix, shift, alt, dbl, doit));
    else return (0);
}

/* ------------------------ managing the selection ----------------- */

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// direction -1 = lower, 1 = raise
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int canvas_restore_original_position(t_glist *x, t_gobj *y, const char* objtag,
    int dir)
{
    /* we do this instead to save us costly redraw of the canvas */
    //fprintf(stderr,"canvas_restore_original_position %lx %lx %s %d\n",
    //    (t_int)x, (t_int)y, objtag, dir);
    int ret = 0;
    // we only do this if we are not embedded inside gop, otherwise
    // when gop is done redrawing we will get properly repositioned
    // by gop's call to restore original position
    if (pd_class(&y->g_pd) != canvas_class || ((t_glist *)y)->gl_owner == x)
    {
        t_object *ob = NULL;
        t_rtext *yrnxt = NULL, *yr = NULL;

        if (y->g_next)
        {
            ob = pd_checkobject(&y->g_next->g_pd);
        }
        if (ob)
        {
            yrnxt = glist_findrtext(x, (t_text *)&ob->ob_g);
        }
        if (y)
        {
            ob = pd_checkobject(&y->g_pd);
        }
        else
        {
            ret = 1;
        }
        if (ob)
        {
            yr = glist_findrtext(x, (t_text *)&ob->ob_g);
        }
        if (ret != 1)
        {
            if (dir == -1)
            {
                if (x->gl_list == y)
                {
                    /* we get here if we are supposed to go all the way
                       to the bottom */
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                    sys_vgui(".x%lx.c addtag arrange withtag %s\n",
                        x, objtag ? objtag : "selected");
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                    sys_vgui(".x%lx.c lower arrange\n", x);
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                    sys_vgui(".x%lx.c dtag %s arrange\n",
                        x, objtag ? objtag : "selected");
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                }
                else if (yrnxt)
                {
                    /* lower into middle */
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                    if (!objtag)
                        sys_vgui(".x%lx.c addtag arrange withtag selected\n",x);
                    sys_vgui("pdtk_find_lowest_widget_withtag_and_arrange "
                        ".x%lx.c %s %s %s\n", x, rtext_gettag(yrnxt),
                        rtext_gettag(yr), objtag ? objtag : "0");
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                }
                else
                {
                    /* fall back to legacy redraw for objects
                       that are not patchable */
                    canvas_redraw(x);
                    ret = -1;
                }
            }
            else
            {
                if (yrnxt)
                {
                    /* raise into middle */
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                    if (!objtag)
                        sys_vgui(".x%lx.c addtag arrange withtag selected\n",x);
                    sys_vgui("pdtk_find_lowest_widget_withtag_and_arrange "
                        ".x%lx.c %s %s %s\n", x, rtext_gettag(yrnxt),
                        rtext_gettag(yr), objtag ? objtag : "0");
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                }
                else if (y->g_next == NULL)
                {
                    /* we get here if we are supposed to go all the way
                       to the top */
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                    sys_vgui(".x%lx.c addtag arrange withtag %s\n",
                        x, objtag ? objtag : "selected");
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                    sys_vgui(".x%lx.c raise arrange\n", x);
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                    sys_vgui(".x%lx.c dtag %s arrange\n", x,
                        objtag ? objtag : "selected");
                    canvas_raise_all_cords(x);
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                }
                else
                {
                    /* fall back to legacy redraw for objects
                       that are not patchable */
                    canvas_redraw(x);
                    ret = -1;
                }
            }
        }
    }
    return(ret);
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}

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void canvas_check_nlet_highlights(t_glist *x)
{
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    if (x->gl_editor->canvas_cnct_inlet_tag[0] != 0)
    {
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        canvas_nlet_conf(x,'i');
        tooltip_erase(x);
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        x->gl_editor->canvas_cnct_inlet_tag[0] = 0;
        //if (x->gl_editor->e_onmotion == MA_CONNECT) {
            x->gl_editor->e_onmotion = MA_NONE;
            canvas_setcursor(x, CURSOR_EDITMODE_NOTHING);
        //}
    }

    if (x->gl_editor->canvas_cnct_outlet_tag[0] != 0 &&
        x->gl_editor->e_onmotion != MA_CONNECT)
    {
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        canvas_nlet_conf(x,'o');
        tooltip_erase(x);
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        x->gl_editor->canvas_cnct_outlet_tag[0] = 0;
        //if (x->gl_editor->e_onmotion == MA_CONNECT) {
            x->gl_editor->e_onmotion = MA_NONE;
            canvas_setcursor(x, CURSOR_EDITMODE_NOTHING);
        //}            
    }
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}

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void glist_selectline(t_glist *x, t_outconnect *oc, int index1,
    int outno, int index2, int inno)
{
    if (x->gl_editor)
    {
        glist_noselect(x);
        x->gl_editor->e_selectedline = 1;
        x->gl_editor->e_selectline_index1 = index1;
        x->gl_editor->e_selectline_outno = outno;
        x->gl_editor->e_selectline_index2 = index2;
        x->gl_editor->e_selectline_inno = inno;
        x->gl_editor->e_selectline_tag = oc;
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        sys_vgui(".x%lx.c itemconfigure l%lx -stroke $pd_colors(selection)\n",
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            x, x->gl_editor->e_selectline_tag);
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        sys_vgui(".x%lx.c addtag selected withtag l%lx\n",
            glist_getcanvas(x), x->gl_editor->e_selectline_tag);
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        c_selection = x;
        canvas_draw_gop_resize_hooks(x);
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    }
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}

void glist_deselectline(t_glist *x)
{
    if (x->gl_editor)
    {
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        t_linetraverser t;
        t_outconnect *oc;
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        x->gl_editor->e_selectedline = 0;
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        linetraverser_start(&t, glist_getcanvas(x));
        do {
            oc = linetraverser_next(&t);
        } while (oc && oc != x->gl_editor->e_selectline_tag);
        int issignal;
        if(outlet_getsymbol(t.tr_outlet) == &s_signal)
            issignal = 1;
        else
            issignal = 0;
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        sys_vgui(".x%lx.c itemconfigure l%lx -stroke %s\n",
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            x, x->gl_editor->e_selectline_tag,
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            (issignal ?
                "$pd_colors(signal_cord)" : "$pd_colors(control_cord)"));
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        sys_vgui(".x%lx.c dtag l%lx selected\n",
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            glist_getcanvas(x),
            glist_getcanvas(x)->gl_editor->e_selectline_tag);
        canvas_draw_gop_resize_hooks(x);
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    }    
}

int glist_isselected(t_glist *x, t_gobj *y)
{
    if (x->gl_editor)
    {
        t_selection *sel;
        for (sel = x->gl_editor->e_selection; sel; sel = sel->sel_next)
            if (sel->sel_what == y) return (1);
    }
    return (0);
}

    /* call this for unselected objects only */
void glist_select(t_glist *x, t_gobj *y)
{
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    //fprintf(stderr,"glist_select c_selection=%lx x=%lx\n",
    //    (t_int)c_selection, (t_int)x);
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    if (x->gl_editor)
    {
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        //fprintf(stderr,"have editor\n");
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#ifdef PDL2ORK
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        // exception: if we are in K12 mode and preset_hub is hidden,
        // do not select it
        if (sys_k12_mode && y->g_pd == preset_hub_class)
        {
            //fprintf(stderr,"glist_select do not select invised preset_hub
            //in K12 mode\n");
            t_preset_hub *ph = (t_preset_hub *)y;
            if (ph->ph_invis > 0) return;
        }
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#endif
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        if (c_selection && c_selection != x)
        {
            //fprintf(stderr,"deselecting\n");
            glist_noselect(c_selection);
        }
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        t_selection *sel = (t_selection *)getbytes(sizeof(*sel));
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        if (x->gl_editor->e_selectedline)
        {
            //fprintf(stderr,"deselecting line\n");
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            glist_deselectline(x);
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        }
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            /* LATER #ifdef out the following check */
        if (glist_isselected(x, y)) bug("glist_select");
        sel->sel_next = x->gl_editor->e_selection;
        sel->sel_what = y;
        x->gl_editor->e_selection = sel;
        gobj_select(y, x, 1);
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        c_selection = x;
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        sys_vgui("pdtk_canvas_update_edit_menu .x%lx 1\n", x);
        canvas_draw_gop_resize_hooks(x);
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    }
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    //fprintf(stderr,"select done\n");
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}

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    /* recursively deselect everything in a gobj "g", if it happens to be
    a glist, in preparation for deselecting g itself in glist_dselect() */
static void glist_checkanddeselectall(t_glist *gl, t_gobj *g)
{
    t_glist *gl2;
    t_gobj *g2;
    if (pd_class(&g->g_pd) != canvas_class)
        return;
    gl2 = (t_glist *)g;
    for (g2 = gl2->gl_list; g2; g2 = g2->g_next)
        glist_checkanddeselectall(gl2, g2);
    glist_noselect(gl2);
}

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int glist_getindex(t_glist *x, t_gobj *y);

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    /* call this for selected objects only */
void glist_deselect(t_glist *x, t_gobj *y)
{
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    //fprintf(stderr, "deselect\n");
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    int fixdsp = 0;
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    //static int reenter = 0;
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    /* if (reenter) return; */
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    //reenter = 1;
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    if (x->gl_editor)
    {
        t_selection *sel, *sel2;
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        t_rtext *fuddy = 0;
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        t_rtext *z = 0;
        if (!glist_isselected(x, y)) bug("glist_deselect");
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        // following information is for undo_apply
        // we need info on the old object's position
        // in the gl_list so that we can restore it
        int pos = glist_getindex(glist_getcanvas(x), y);
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        if (x->gl_editor->e_textedfor)
        {
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            //fprintf(stderr, "e_textedfor\n");
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            fuddy = glist_findrtext(x, (t_text *)y);
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            if (x->gl_editor->e_textedfor == fuddy)
            {
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                //fprintf(stderr, "e_textedfor == fuddy\n");
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                if (x->gl_editor->e_textdirty)
                {
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                    //fprintf(stderr, "textdirty yes\n");
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                    z = fuddy;
                    canvas_stowconnections(glist_getcanvas(x));
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                    glist_checkanddeselectall(x, y);
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                }
                gobj_activate(y, x, 0);
            }
            if (zgetfn(&y->g_pd, gensym("dsp")))
                fixdsp = canvas_suspend_dsp();
        }
        if ((sel = x->gl_editor->e_selection)->sel_what == y)
        {
            x->gl_editor->e_selection = x->gl_editor->e_selection->sel_next;
            gobj_select(sel->sel_what, x, 0);
            freebytes(sel, sizeof(*sel));
        }
        else
        {
            for (sel = x->gl_editor->e_selection; sel2 = sel->sel_next;
                sel = sel2)
            {
                if (sel2->sel_what == y)
                {
                    sel->sel_next = sel2->sel_next;
                    gobj_select(sel2->sel_what, x, 0);
                    freebytes(sel2, sizeof(*sel2));
                    break;
                }
            }
        }
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        // if we have an invalid object even if the text hasn't changed,
        // we should still try to recreate it
        if (!z && fuddy && pd_class(&((t_text *)y)->te_pd) == text_class &&
            ((t_text *)y)->te_type != T_TEXT)
        {
            z = fuddy;
        }
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        if (z)
        {
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            //fprintf(stderr, "setto\n");
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            char *buf;
            int bufsize;

            rtext_gettext(z, &buf, &bufsize);
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            text_setto((t_text *)y, x, buf, bufsize, pos);
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            canvas_fixlinesfor(glist_getcanvas(x), (t_text *)y);
            x->gl_editor->e_textedfor = 0;
        }
        if (fixdsp)
            canvas_resume_dsp(1);
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        if (!x->gl_editor->e_selection)
            sys_vgui("pdtk_canvas_update_edit_menu .x%lx 0\n", x);
        canvas_draw_gop_resize_hooks(x);
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    }
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    //reenter = 0;
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}

void glist_noselect(t_glist *x)
{
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    //fprintf(stderr,"glist_noselect\n");
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    if (x->gl_editor)
    {
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        if (x->gl_editor->e_selection)
        {
            while (x->gl_editor->e_selection)
                glist_deselect(x, x->gl_editor->e_selection->sel_what);
        }
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        if (x->gl_editor->e_selectedline)
            glist_deselectline(x);
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        if (c_selection == x)
            c_selection = NULL;
        canvas_draw_gop_resize_hooks(x);
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    }
}

void glist_selectall(t_glist *x)
{
    if (x->gl_editor)
    {
        glist_noselect(x);
        if (x->gl_list)
        {
            t_gobj *y = x->gl_list;
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            // exception: if we are in K12 mode and preset_hub is hidden,
            // do not select it
            if (sys_k12_mode && y->g_pd == preset_hub_class)
            {
                //fprintf(stderr,"glist_select do not select "
                //               "invised preset_hub in K12 mode\n");
                t_preset_hub *ph = (t_preset_hub *)y;
                if (ph->ph_invis > 0) y = y->g_next;
            }
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#endif
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            if (y)
            {
                t_selection *sel = (t_selection *)getbytes(sizeof(*sel));
                x->gl_editor->e_selection = sel;
                sel->sel_what = y;
                gobj_select(y, x, 1);
                while (y = y->g_next)
                {
                    t_selection *sel2 = (t_selection *)getbytes(sizeof(*sel2));
                    sel->sel_next = sel2;
                    sel = sel2;
                    sel->sel_what = y;
                    gobj_select(y, x, 1);
                }
                sel->sel_next = 0;
                c_selection = x;
            }
        }
        canvas_draw_gop_resize_hooks(x);
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    }
}

    /* get the index of a gobj in a glist.  If y is zero, return the
    total number of objects. */
int glist_getindex(t_glist *x, t_gobj *y)
{
    t_gobj *y2;
    int indx;

    for (y2 = x->gl_list, indx = 0; y2 && y2 != y; y2 = y2->g_next)
        indx++;
    return (indx);
}

    /* get the index of the object, among selected items, if "selected"
    is set; otherwise, among unselected ones.  If y is zero, just
    counts the selected or unselected objects. */
int glist_selectionindex(t_glist *x, t_gobj *y, int selected)
{
    t_gobj *y2;
    int indx;

    for (y2 = x->gl_list, indx = 0; y2 && y2 != y; y2 = y2->g_next)
        if (selected == glist_isselected(x, y2))
            indx++;
    return (indx);
}

static t_gobj *glist_nth(t_glist *x, int n)
{
    t_gobj *y;
    int indx;
    for (y = x->gl_list, indx = 0; y; y = y->g_next, indx++)
        if (indx == n)
            return (y);
    return (0);
}

/* ------------------- support for undo/redo  -------------------------- */

static t_undofn canvas_undo_fn;         /* current undo function if any */
static int canvas_undo_whatnext;        /* whether we can now UNDO or REDO */
static void *canvas_undo_buf;           /* data private to the undo function */
static t_canvas *canvas_undo_canvas;    /* which canvas we can undo on */
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const char *canvas_undo_name;
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void canvas_setundo(t_canvas *x, t_undofn undofn, void *buf,
    const char *name)
{
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    //fprintf(stderr,"canvas_setundo %s\n", name);
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    int hadone = 0;
        /* blow away the old undo information.  In one special case the
        old undo info is re-used; if so we shouldn't free it here. */
    if (canvas_undo_fn && canvas_undo_buf && (buf != canvas_undo_buf))
    {
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        //fprintf(stderr,"hadone canvas_setundo\n");
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        (*canvas_undo_fn)(canvas_undo_canvas, canvas_undo_buf, UNDO_FREE);
        hadone = 1;
    }
    canvas_undo_canvas = x;
    canvas_undo_fn = undofn;
    canvas_undo_buf = buf;
    canvas_undo_whatnext = UNDO_UNDO;
    canvas_undo_name = name;
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    //if (x && glist_isvisible(x) && glist_istoplevel(x))
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    if (x)
        // enable undo in menu
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        sys_vgui("pdtk_undomenu .x%lx %s no\n", x, name);
    else if (hadone)
        sys_vgui("pdtk_undomenu nobody no no\n");
}

    /* clear undo if it happens to be for the canvas x.
     (but if x is 0, clear it regardless of who owns it.) */
void canvas_noundo(t_canvas *x)
{
    if (!x || (x == canvas_undo_canvas))
        canvas_setundo(0, 0, 0, "foo");
}

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#if 0
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static void canvas_undo(t_canvas *x)
{
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    //fprintf(stderr,"canvas_undo\n");
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    if (x != canvas_undo_canvas)
        bug("canvas_undo 1");
    else if (canvas_undo_whatnext != UNDO_UNDO)
        bug("canvas_undo 2");
    else
    {
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        //fprintf(stderr,"undo\n");
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        (*canvas_undo_fn)(canvas_undo_canvas, canvas_undo_buf, UNDO_UNDO);
            /* enable redo in menu */
        if (glist_isvisible(x) && glist_istoplevel(x))
            sys_vgui("pdtk_undomenu .x%lx no %s\n", x, canvas_undo_name);
        canvas_undo_whatnext = UNDO_REDO;
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        scrollbar_update(x);
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    }
}

static void canvas_redo(t_canvas *x)
{
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    //fprintf(stderr,"canvas_redo\n");
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    if (x != canvas_undo_canvas)
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        bug("canvas_redo 1");
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    else if (canvas_undo_whatnext != UNDO_REDO)
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        bug("canvas_redo 2");
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    else
    {
        /* post("redo"); */
        (*canvas_undo_fn)(canvas_undo_canvas, canvas_undo_buf, UNDO_REDO);
            /* enable undo in menu */
        if (glist_isvisible(x) && glist_istoplevel(x))
            sys_vgui("pdtk_undomenu .x%lx %s no\n", x, canvas_undo_name);
        canvas_undo_whatnext = UNDO_UNDO;
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        scrollbar_update(x);
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    }
}
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#endif
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/* ------- specific undo methods: 1. connect -------- */
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typedef struct _undo_connect    
{
    int u_index1;
    int u_outletno;
    int u_index2;
    int u_inletno;
} t_undo_connect;

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void *canvas_undo_set_disconnect(t_canvas *x,
    int index1, int outno, int index2, int inno);

/* connect just calls disconnect actions backward... (see below) */
void *canvas_undo_set_connect(t_canvas *x,
    int index1, int outno, int index2, int inno)
{
    return (canvas_undo_set_disconnect(x, index1, outno, index2, inno));
}

void canvas_undo_connect(t_canvas *x, void *z, int action)
{
    int myaction;
    if (action == UNDO_UNDO)
        myaction = UNDO_REDO;
    else if (action == UNDO_REDO)
        myaction = UNDO_UNDO;
    else myaction = action;
    canvas_undo_disconnect(x, z, myaction);
}

/* ------- specific undo methods: 2. disconnect -------- */

void *canvas_undo_set_disconnect(t_canvas *x,
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    int index1, int outno, int index2, int inno)
{
    t_undo_connect *buf = (t_undo_connect *)getbytes(sizeof(*buf));
    buf->u_index1 = index1;
    buf->u_outletno = outno;
    buf->u_index2 = index2;
    buf->u_inletno = inno;
    return (buf);
}

void canvas_disconnect(t_canvas *x,
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    t_float index1, t_float outno, t_float index2, t_float inno)
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{
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    //fprintf(stderr,"canvas_disconnect\n");
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    t_linetraverser t;
    t_outconnect *oc;
    linetraverser_start(&t, x);
    while (oc = linetraverser_next(&t))
    {
        int srcno = canvas_getindex(x, &t.tr_ob->ob_g);
        int sinkno = canvas_getindex(x, &t.tr_ob2->ob_g);
        if (srcno == index1 && t.tr_outno == outno &&
            sinkno == index2 && t.tr_inno == inno)
        {
            sys_vgui(".x%lx.c delete l%lx\n", x, oc);
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            // jsarlo
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            if(x->gl_editor && x->gl_editor->gl_magic_glass)
            {
                magicGlass_unbind(x->gl_editor->gl_magic_glass);
                magicGlass_hide(x->gl_editor->gl_magic_glass);
            }
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            // end jsarlo
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            obj_disconnect(t.tr_ob, t.tr_outno, t.tr_ob2, t.tr_inno);
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            /* if we are dealing with a preset_node, make sure to also
               disconnect its invisible return node. We trust here that
               the object has been already connected to a valid object
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               so we blindly disconnect first outlet with the first inlet */
            if (pd_class(&t.tr_ob->ob_g.g_pd) == preset_node_class && t.tr_outno == 0)
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            {
                //fprintf(stderr,"gotta disconnect hidden one too...\n");
                obj_disconnect(t.tr_ob2, 0, t.tr_ob, 0);
            }
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            break;
        }
    }
}

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void canvas_undo_disconnect(t_canvas *x, void *z, int action)
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{
    t_undo_connect *buf = z;
    if (action == UNDO_UNDO)
    {
        canvas_connect(x, buf->u_index1, buf->u_outletno,
            buf->u_index2, buf->u_inletno);
    }
    else if (action == UNDO_REDO)
    {
        canvas_disconnect(x, buf->u_index1, buf->u_outletno,
            buf->u_index2, buf->u_inletno);
    }
    else if (action == UNDO_FREE)
        t_freebytes(buf, sizeof(*buf));
}

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/* ---------- ... 3. cut, clear, and typing into objects: -------- */
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#define UCUT_CUT 1          /* operation was a cut */
#define UCUT_CLEAR 2        /* .. a clear */
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// following action is not needed any more LATER remove any signs of UCUT_TEXT
// since recreate takes care of this in a more elegant way
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#define UCUT_TEXT 3         /* text typed into a box */

typedef struct _undo_cut        
{
    t_binbuf *u_objectbuf;      /* the object cleared or typed into */
    t_binbuf *u_reconnectbuf;   /* connections into and out of object */
    t_binbuf *u_redotextbuf;    /* buffer to paste back for redo if TEXT */
    int u_mode;                 /* from flags above */
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    int n_obj;                  /* number of selected objects to be cut */
    int p_a[1];    /* array of original glist positions of selected objects.
                      At least one object is selected, we dynamically resize
                      it later */
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} t_undo_cut;

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void *canvas_undo_set_cut(t_canvas *x, int mode)
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{
    t_undo_cut *buf;
    t_gobj *y;
    t_linetraverser t;
    t_outconnect *oc;
    int nnotsel= glist_selectionindex(x, 0, 0);
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    int nsel = glist_selectionindex(x, 0, 1);
    buf = (t_undo_cut *)getbytes(sizeof(*buf) +
        sizeof(buf->p_a[0]) * (nsel - 1));
    buf->n_obj = nsel;
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    buf->u_mode = mode;
    buf->u_redotextbuf = 0;

        /* store connections into/out of the selection */
    buf->u_reconnectbuf = binbuf_new();
    linetraverser_start(&t, x);
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    //if (linetraverser_next(&t)) {
    while (oc = linetraverser_next(&t))
    {
        int issel1 = glist_isselected(x, &t.tr_ob->ob_g);
        int issel2 = glist_isselected(x, &t.tr_ob2->ob_g);
        if (issel1 != issel2)
        {
            binbuf_addv(buf->u_reconnectbuf, "ssiiii;",
                gensym("#X"), gensym("connect"),
                (issel1 ? nnotsel : 0)
                    + glist_selectionindex(x, &t.tr_ob->ob_g, issel1),
                t.tr_outno,
                (issel2 ? nnotsel : 0) +
                    glist_selectionindex(x, &t.tr_ob2->ob_g, issel2),
                t.tr_inno);
        }
    }
    //}
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    if (mode == UCUT_TEXT)
    {
        buf->u_objectbuf = canvas_docopy(x);
    }
    else if (mode == UCUT_CUT)
    {
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        buf->u_objectbuf = canvas_docopy(x);
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    }
    else if (mode == UCUT_CLEAR)
    {
        buf->u_objectbuf = canvas_docopy(x);
    }
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    //instantiate num_obj and fill array of positions of selected objects
    if (mode == UCUT_CUT || mode == UCUT_CLEAR)
    {
        int i = 0, j = 0;
        if (x->gl_list)
        {
            for (y = x->gl_list; y; y = y->g_next)
            {
                if (glist_isselected(x, y))
                {
                    buf->p_a[i] = j;
                    i++;
                }
                j++;
            }
        }
        //for (i = 0; i < buf->n_obj; i++)
        //    fprintf(stderr,"%d position = %d\n", i, buf->p_a[i]);
    }
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    return (buf);
}

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void canvas_undo_cut(t_canvas *x, void *z, int action)
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{
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    //fprintf(stderr, "canvas_undo_cut canvas=%d buf=%d action=%d\n",
    //    (int)x, (int)z, action);
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    t_undo_cut *buf = z;
    int mode = buf->u_mode;
    if (action == UNDO_UNDO)