tablet::tablet(widget* w, char* options) : canvas(w,"tablet",0) { 
      widget* top = new frame(path());
  
      init(options);                          // inialization, layout
      redirect(c);                            // redirect to canvas
      bind(this);                             // this is the handler
  
      handlers[drawmode::draw] = new draw_handler(this);
      handlers[drawmode::move] = new move_handler(this);
      handlers[drawmode::box] = new box_handler(this);
      handlers[drawmode::circle] = new circle_handler(this);
      handlers[drawmode::arrow] = new arrow_handler(this);
      _mode = drawmode::draw;
    }