Re: XForms: fl_set_object_position

From: Steve Lamont (
Date: Wed Apr 19 2000 - 10:45:03 EDT

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    # To subscribers of the xforms list from (Steve Lamont) :

    > I am trying to move a group of objects to a new position at once with
    > fl_set_object_position ( Light_controls, new_x, new_y);
    > where Light_controls is a group defined with fl_bgn_group.

    The attributes which are controlled by Groups are pretty limited --
    you can hide or show a Group, set gravity, or set some other
    attributes, as well as Group a set of buttons into a radio button

    Since each Object in a Group has its own position, relative to the
    origin of the Form and not relative to the origin of the Group, which
    maintains no useful positional information, you can't reposition a
    group in the way you are attempting.

    You could cobble up something like

            fl_move_group_relative( FL_OBJECT *group, int delta_x, int delta_y )


                FL_OBJECT *obj = group->next;

                while ( obj->class != FL_END_GROUP ) {

                    FL_Coord x;
                    FL_Coord y;

                    fl_get_object_position( obj, &x, &y );
                    fl_set_object_position( obj, x + delta_x, y + delta_y );

                    obj = obj->next;



    which would move the whole Group. This code hasn't been tested and it
    isn't bulletproof (no test for whether `*group' points to an Object of
    class FL_BEGIN_GROUP, for instance), but it's a good start.

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