/* action.c
 *
 * $Id$
 *
 * Copyright 1990, 1991, 1992, 1993, 1994, 1995, Oliver Laumann, Berlin
 * Copyright 2002, 2003 Sam Hocevar <sam@hocevar.net>, Paris
 *
 * This software was derived from Elk 1.2, which was Copyright 1987, 1988,
 * 1989, Nixdorf Computer AG and TELES GmbH, Berlin (Elk 1.2 has been written
 * by Oliver Laumann for TELES Telematic Services, Berlin, in a joint project
 * between TELES and Nixdorf Microprocessor Engineering, Berlin).
 *
 * Oliver Laumann, TELES GmbH, Nixdorf Computer AG and Sam Hocevar, as co-
 * owners or individual owners of copyright in this software, grant to any
 * person or company a worldwide, royalty free, license to
 *
 *    i) copy this software,
 *   ii) prepare derivative works based on this software,
 *  iii) distribute copies of this software or derivative works,
 *   iv) perform this software, or
 *    v) display this software,
 *
 * provided that this notice is not removed and that neither Oliver Laumann
 * nor Teles nor Nixdorf are deemed to have made any representations as to
 * the suitability of this software for any purpose nor are held responsible
 * for any defects of this software.
 *
 * THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
 */

#include "xt.h"

typedef struct action {
    char *name;
    int num;
    XtAppContext con;
    struct action *next;
} ACTION;

ACTION *actions;

/*ARGSUSED*/
static void Dummy_Action (Widget w, XEvent *ep, String *argv, int *argc) {
}

void Action_Hook (Widget w, XtPointer client_data, char *name, XEvent *ep,
                  char **argv, int *argc) {
    ACTION *ap;
    Object args, params, tail;
    register int i;
    GC_Node3;

    for (ap = actions; ap; ap = ap->next) {
        if (strcmp (ap->name, name))
            continue;
        args = params = tail = Null;
        GC_Link3 (args, params, tail);
        params = P_Make_List (Make_Integer (*argc), Null);
        for (i = 0, tail = params; i < *argc; tail = Cdr (tail), i++) {
            Object tmp;

            tmp = Make_String (argv[i], strlen (argv[i]));
            Car (tail) = tmp;
        }
        args = Cons (params, Null);
        params = Get_Event_Args (ep);
        args = Cons (Copy_List (params), args);
        Destroy_Event_Args (params);
        args = Cons (Make_Widget_Foreign (w), args);
        (void)Funcall (Get_Function (ap->num), args, 0);
        GC_Unlink;
    }
}

static Object P_Context_Add_Action (Object c, Object s, Object p) {
    ACTION *ap;
    XtActionsRec a;

    Check_Context (c);
    Check_Procedure (p);
    ap = (ACTION *)XtMalloc (sizeof (ACTION));
    ap->num = Register_Function (p);
    ap->name = XtNewString (Get_Strsym (s));
    ap->con = CONTEXT(c)->context;
    ap->next = actions;
    actions = ap;
    a.string = ap->name;
    a.proc = (XtActionProc)Dummy_Action;
    XtAppAddActions (ap->con, &a, 1);
    return Void;
}

void Free_Actions (XtAppContext con) {
    register ACTION *p, **pp;

    for (pp = &actions; (p = *pp); ) {
        if (p->con == con) {
            Deregister_Function (p->num);
            XtFree (p->name);
            *pp = p->next;
            XtFree ((char *)p);
        } else pp = &p->next;
    }
}

void elk_init_xt_action () {
    Define_Primitive (P_Context_Add_Action, "context-add-action", 3, 3, EVAL);
}