g_editor.c 166 KB
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/* Copyright (c) 1997-2001 Miller Puckette and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */

#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 "g_undo.h"
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#include <string.h>

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_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);
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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static char canvas_cnct_inlet_tag[4096];
static char canvas_cnct_outlet_tag[4096];
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 */
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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// for updating preset_node locations in case of operations that alter glist object locations (tofront/back, cut, delete, undo/redo cut/delete)
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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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 */
int gobj_filter_highlight_behavior(t_rtext *y) {

	char *buf;
	char name[4];
	int bufsize, i;
	rtext_gettext(y, &buf, &bufsize);
	for (i = 0; i < 3; i++) {
		name[i] = buf[i];
	}
	name[3]='\0';
	//fprintf(stderr,"object name = >%s<\n", name);
	if (!strcmp(name, "bng") ||
		!strcmp(name, "nbx") ||
		!strcmp(name, "hdl") ||
		!strcmp(name, "hsl") ||
		!strcmp(name, "tgl") ||
		!strcmp(name, "vdl") ||
		!strcmp(name, "vsl") ||
		!strcmp(name, "vu ") ||
		/* alternative names for hradio and vradio when invoked from the menu */
		!strcmp(name, "hra") ||
		!strcmp(name, "vra")
		)
		return 1;

	return 0;
}
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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\n");
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    if (!glist->gl_havewindow && glist->gl_isgraph && glist->gl_goprect &&
        glist->gl_owner && (pd_class(&glist->gl_pd) != garray_class))
    {
        /* 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);
        if (gx1 < x1 || gx1 > x2 || gx2 < x1 || gx2 > x2 ||
            gy1 < y1 || gy1 > y2 || gy2 < y1 || gy2 > y2)
                return (0);
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		if (glist==glist_getcanvas(glist))
        	sys_vgui(".x%lx.c raise all_cords\n", glist_getcanvas(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. */
        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)));
    }
    else return (1);
}

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void gobj_vis(t_gobj *x, struct _glist *glist, int flag)
{
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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 ----------------- */

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 -fill $select_color\n",
            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);
		c_selection = x;
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		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;
        sys_vgui(".x%lx.c itemconfigure l%lx -fill %s\n",
            x, x->gl_editor->e_selectline_tag,
            (issignal ? "$signal_cord" : "$msg_cord"));
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        sys_vgui(".x%lx.c dtag l%lx selected\n",
            glist_getcanvas(x), glist_getcanvas(x)->gl_editor->e_selectline_tag);
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		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\n");
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    if (x->gl_editor)
    {
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		if (c_selection && c_selection != x)
			glist_noselect(c_selection);
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        t_selection *sel = (t_selection *)getbytes(sizeof(*sel));
        if (x->gl_editor->e_selectedline)
            glist_deselectline(x);
            /* 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);
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		canvas_draw_gop_resize_hooks(x);
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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;
    static int reenter = 0;
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    /* if (reenter) return; */
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    reenter = 1;
    if (x->gl_editor)
    {
        t_selection *sel, *sel2;
        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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            t_rtext *fuddy = glist_findrtext(x, (t_text *)y);
            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;
                }
            }
        }
        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);
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		canvas_draw_gop_resize_hooks(x);
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    }
    reenter = 0;
}

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;
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		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_selection *sel = (t_selection *)getbytes(sizeof(*sel));
            t_gobj *y = x->gl_list;
            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;
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			c_selection = x;
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        }
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		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))
	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");
}

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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		sys_vgui("pdtk_canvas_getscroll .x%lx.c\n", 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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		sys_vgui("pdtk_canvas_getscroll .x%lx.c\n", x);
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    }
}

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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
			if(x->gl_magic_glass) {
            	magicGlass_unbind(x->gl_magic_glass);
            	magicGlass_hide(x->gl_magic_glass);
			}
            // 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 so we blindly
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			// disconnect first outlet with the first inlet (EXCEPTION: print object that cannot be connected back to)
			if (pd_class(&t.tr_ob->ob_g.g_pd) == preset_node_class && pd_class(&t.tr_ob2->ob_g.g_pd) != print_class) {
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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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	}
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	//}
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    if (mode == UCUT_TEXT)
    {
        buf->u_objectbuf = canvas_docopy(x);
    }
    else if (mode == UCUT_CUT)
    {
        buf->u_objectbuf = 0;
    }
    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)
    {
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		//fprintf(stderr,"UNDO_UNDO\n");
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        if (mode == UCUT_CUT) {
			//fprintf(stderr, "UCUT_CUT\n");
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            canvas_dopaste(x, copy_binbuf);
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		}
        else if (mode == UCUT_CLEAR) {
			//fprintf(stderr, "UCUT_CLEAR\n");
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            canvas_dopaste(x, buf->u_objectbuf);
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		}
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        else if (mode == UCUT_TEXT)
        {
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			//fprintf(stderr, "UCUT_TEXT\n");
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            t_gobj *y1, *y2;
            glist_noselect(x);
            for (y1 = x->gl_list; y2 = y1->g_next; y1 = y2)
                ;
            if (y1)
            {
                if (!buf->u_redotextbuf)
                {
                    glist_noselect(x);
                    glist_select(x, y1);
                    buf->u_redotextbuf = canvas_docopy(x);
                    glist_noselect(x);
                }
                glist_delete(x, y1);
            }
            canvas_dopaste(x, buf->u_objectbuf);
        }
        pd_bind(&x->gl_pd, gensym("#X"));
        binbuf_eval(buf->u_reconnectbuf, 0, 0, 0);
        pd_unbind(&x->gl_pd, gensym("#X"));
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		//now reposition objects to their original locations
		if (mode == UCUT_CUT || mode == UCUT_CLEAR) {
			//fprintf(stderr,"reordering\n");
			int i = 0;
			int paste_pos = glist_getindex(x,0) - buf->n_obj; //location of the first newly pasted object
			//fprintf(stderr,"paste_pos %d\n", paste_pos);
			t_gobj *y_prev, *y, *y_next;
			for (i = 0; i < buf->n_obj; i++) {
				//first check if we are in the same position already
				if (paste_pos+i != buf->p_a[i]) {
					//fprintf(stderr,"not in the right place\n");
					y_prev = glist_nth(x, paste_pos-1+i);
					y = glist_nth(x, paste_pos+i);
					y_next = glist_nth(x, paste_pos+1+i);
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					//if the object is supposed to be first in the gl_list
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					if (buf->p_a[i] == 0) {
						if (y_prev && y_next) {
							y_prev->g_next = y_next;
						}
						else if (y_prev && !y_next)
							y_prev->g_next = NULL;
						//now put the moved object at the beginning of the cue
						y->g_next = glist_nth(x, 0);
						x->gl_list = y;
					}
					//if the object is supposed to be at the current end of gl_list	
					//can this ever happen???
					/*else if (!glist_nth(x,buf->p_a[i])) {

					}*/
					//if the object is supposed to be in the middle of gl_list
					else {
						if (y_prev && y_next) {
							y_prev->g_next = y_next;
						}
						else if (y_prev && !y_next) {
							y_prev->g_next = NULL;
						}
						//now put the moved object in its right place
						y_prev = glist_nth(x, buf->p_a[i]-1);
						y_next = glist_nth(x, buf->p_a[i]);

						y_prev->g_next = y;
						y->g_next = y_next;
					}
				}
				canvas_redraw(x);
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				glob_preset_node_list_check_loc_and_update();

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			}
		}
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    }
    else if (action == UNDO_REDO)
    {
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		//fprintf(stderr,"UNDO_REDO\n");
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        if (mode == UCUT_CUT || mode == UCUT_CLEAR) {
			//we can't just blindly do clear here when the user may have
			//unselected things between undo and redo, so first let's select
			//the right stuff
			glist_noselect(x);
			int i = 0;
			for (i = 0; i < buf->n_obj; i++)
            	glist_select(x, glist_nth(x, buf->p_a[i]));
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            canvas_doclear(x);
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			glob_preset_node_list_check_loc_and_update();
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		}
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        else if (mode == UCUT_TEXT)
        {
            t_gobj *y1, *y2;
            for (y1 = x->gl_list; y2 = y1->g_next; y1 = y2)
                ;
            if (y1)
                glist_delete(x, y1);
            canvas_dopaste(x, buf->u_redotextbuf);
            pd_bind(&x->gl_pd, gensym("#X"));
            binbuf_eval(buf->u_reconnectbuf, 0, 0, 0);
            pd_unbind(&x->gl_pd, gensym("#X"));
        }
    }
    else if (action == UNDO_FREE)
    {
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		//fprintf(stderr,"UNDO_FREE\n");
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        if (buf->u_objectbuf)
            binbuf_free(buf->u_objectbuf);
        if (buf->u_reconnectbuf)
            binbuf_free(buf->u_reconnectbuf);
        if (buf->u_redotextbuf)
            binbuf_free(buf->u_redotextbuf);
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        if (buf != NULL) t_freebytes(buf, sizeof(*buf) + sizeof(buf->p_a[0]) * (buf->n_obj-1));
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    }
}

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/* --------- 4. motion, including "tidy up" and stretching ----------- */
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typedef struct _undo_move_elem  
{
    int e_index;
    int e_xpix;
    int e_ypix;
} t_undo_move_elem;

typedef struct _undo_move       
{
    t_undo_move_elem *u_vec;
    int u_n;
} t_undo_move;

static int canvas_undo_already_set_move;

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void *canvas_undo_set_move(t_canvas *x, int selected)
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{
    int x1, y1, x2, y2, i, indx;
    t_gobj *y;
    t_undo_move *buf =  (t_undo_move *)getbytes(sizeof(*buf));
    buf->u_n = selected ? glist_selectionindex(x, 0, 1) : glist_getindex(x, 0);
    buf->u_vec = (t_undo_move_elem *)getbytes(sizeof(*buf->u_vec) *
        (selected ? glist_selectionindex(x, 0, 1) : glist_getindex(x, 0)));
    if (selected)
    {
        for (y = x->gl_list, i = indx = 0; y; y = y->g_next, indx++)
            if (glist_isselected(x, y))
        {
            gobj_getrect(y, x, &x1, &y1, &x2, &y2);
            buf->u_vec[i].e_index = indx;
            buf->u_vec[i].e_xpix = x1;
            buf->u_vec[i].e_ypix = y1;
            i++;
        }
    }
    else
    {
        for (y = x->gl_list, indx = 0; y; y = y->g_next, indx++)
        {
            gobj_getrect(y, x, &x1, &y1, &x2, &y2);
            buf->u_vec[indx].e_index = indx;
            buf->u_vec[indx].e_xpix = x1;
            buf->u_vec[indx].e_ypix = y1;
        }
    }
    canvas_undo_already_set_move = 1;
    return (buf);
}

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void canvas_undo_move(t_canvas *x, void *z, int action)
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{
    t_undo_move *buf = z;
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	t_class *cl;
	int resortin = 0, resortout = 0;
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    if (action == UNDO_UNDO || action == UNDO_REDO)
    {
        int i;
        for (i = 0; i < buf->u_n; i++)
        {
            int x1, y1, x2, y2, newx, newy;
            t_gobj *y;
            newx = buf->u_vec[i].e_xpix;
            newy = buf->u_vec[i].e_ypix;
            y = glist_nth(x, buf->u_vec[i].e_index);
            if (y)
            {
                gobj_getrect(y, x, &x1, &y1, &x2, &y2);
                gobj_displace(y, x, newx-x1, newy - y1);
                buf->u_vec[i].e_xpix = x1;
                buf->u_vec[i].e_ypix = y1;
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				cl = pd_class(&y->g_pd);
		        if (cl == vinlet_class) resortin = 1;
		        else if (cl == voutlet_class) resortout = 1;
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				glist_select(x, y);
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            }
        }
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		if (resortin) canvas_resortinlets(x);
		if (resortout) canvas_resortoutlets(x);
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    }
    else if (action == UNDO_FREE)
    {
        t_freebytes(buf->u_vec, buf->u_n * sizeof(*buf->u_vec));
        t_freebytes(buf, sizeof(*buf));
    }
}

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/* --------- 5. paste (also duplicate) ----------- */
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typedef struct _undo_paste      
{
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    int u_index;    		/* index of first object pasted */
	int u_sel_index; 		/* index of object selected at the time the other object was pasted (for autopatching) */ 
	t_binbuf *u_objectbuf;	/* here we store actual copied data */
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} t_undo_paste;

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void *canvas_undo_set_paste(t_canvas *x, int offset)
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{
    t_undo_paste *buf =  (t_undo_paste *)getbytes(sizeof(*buf));
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    buf->u_index = glist_getindex(x, 0) - offset; //do we need offset at all?
	if (x->gl_editor->e_selection && !x->gl_editor->e_selection->sel_next) {
		//if only one object is selected which will warrant autopatching
		buf->u_sel_index = glist_getindex(x, x->gl_editor->e_selection->sel_what);
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		//fprintf(stderr,"canvas_undo_set_paste selected object index %d\n", buf->u_sel_index);
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	} else {
		buf->u_sel_index = -1;
	}
	buf->u_objectbuf = binbuf_duplicate(copy_binbuf);
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    return (buf);
}

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void canvas_undo_paste(t_canvas *x, void *z, int action)
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{
    t_undo_paste *buf = z;
    if (action == UNDO_UNDO)
    {
        t_gobj *y;
        glist_noselect(x);
        for (y = glist_nth(x, buf->u_index); y; y = y->g_next)
            glist_select(x, y);
        canvas_doclear(x);
    }
    else if (action == UNDO_REDO)
    {
        t_selection *sel;
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		glist_noselect(x);
		//if the pasted object is supposed to be autopatched
		//then select the object it should be autopatched to
		if (buf->u_sel_index > -1)
			glist_select(x, glist_nth(x, buf->u_sel_index));
        canvas_dopaste(x, buf->u_objectbuf);
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            /* if it was "duplicate" have to re-enact the displacement. */
        if (canvas_undo_name && canvas_undo_name[0] == 'd')
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            //for (sel = x->gl_editor->e_selection; sel; sel = sel->sel_next)
            //    gobj_displace(sel->sel_what, x, 10, 10);
			canvas_paste_xyoffset(x);
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    }
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	else if (action == UNDO_FREE) {
        if (buf->u_objectbuf)
            binbuf_free(buf->u_objectbuf);
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        t_freebytes(buf, sizeof(*buf));
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	}
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}

    /* recursively check for abstractions to reload as result of a save. 
    Don't reload the one we just saved ("except") though. */
    /*  LATER try to do the same trick for externs. */
static void glist_doreload(t_glist *gl, t_symbol *name, t_symbol *dir,