## Copyright (C) 2010-2013 Kai Habel
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING.  If not, see
## <http://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn {Function File} {} __add_default_menu__ (@var{fig})
## Add default menu to figure.  All uimenu handles have
## their @qcode{"HandleVisibility"} property set to @qcode{"off"}.
## @end deftypefn

## Author: Kai Habel

function __add_default_menu__ (fig)

  ## Only FLTK toolkit currently provides menubar
  if (! strcmp (get (fig, "__graphics_toolkit__"), "fltk"))
    return;
  endif

  obj = findall (fig, "-depth", 1, "tag", "__default_menu__", "label", "&File");
  if (isempty (obj))
    ## FIXME: uimenu() will cause menubar to be displayed, even though property
    ##        menubar remains set at "none".  So, forcibly turn menubar status
    ##        on and then off to force figure to hide menubar.
    menubar_state = get (fig, "menubar");
    set (fig, "menubar", "figure");

    __f = uimenu (fig, "label", "&File", "handlevisibility", "off",
                       "tag", "__default_menu__");
      uimenu (__f, "label", "Save &As", "callback", @save_cb);
      uimenu (__f, "label", "&Save", "callback", @save_cb);
      uimenu (__f, "label", "&Close", "callback", "close (gcf)");

    __e = uimenu (fig, "label", "&Edit", "handlevisibility", "off",
                       "tag", "__default_menu__");
      uimenu (__e, "label", "&Grid", "callback", @grid_cb);
      uimenu (__e, "label", "Auto&scale", "callback", @autoscale_cb);
      gm = uimenu (__e, "label", "GUI &Mode");
        uimenu (gm, "label", "Pan+Zoom", "callback", @guimode_cb);
        uimenu (gm, "label", "Rotate+Zoom", "callback", @guimode_cb);
        uimenu (gm, "label", "None+Zoom", "callback", @guimode_cb);

    ## FIXME: This drawnow () must occur after at least one menu item has
    ##        been defined to avoid sizing issues in new figures.
    ##        This may lead to flicker.  The real fix must be in the C++ code. 
    drawnow ();

    set (fig, "menubar", menubar_state);
  endif

endfunction

function save_cb (h, e)
  lbl = get (gcbo, "label");
  if (strcmp (lbl, "&Save"))
    fname = get (gcbo, "userdata");
    if (isempty (fname))
      __save_as__ (gcbo);
    else
      saveas (gcbo, fname);
    endif
  elseif (strcmp (lbl, "Save &As"))
    __save_as__ (gcbo);
  endif
endfunction

function __save_as__ (caller)
  [filename, filedir] = uiputfile ({"*.pdf;*.ps;*.gif;*.png;*.jpg",
                                    "Supported Graphic Formats"},
                                   "Save Figure",
                                   pwd);
  if (filename != 0)
    fname = [filedir filesep() filename];
    obj = findall (gcbf, "label", "&Save");
    if (! isempty (obj))
      set (obj(1), "userdata", fname);
    endif
    saveas (caller, fname);
  endif
endfunction

function grid_cb (h, e)
  grid;
endfunction

function autoscale_cb (h, e)
  axis ("auto");
endfunction

function guimode_cb (h, e)
  lbl = get (h, "label");
  switch (lbl)
    case "Pan+Zoom"
      gui_mode ("2D");
    case "Rotate+Zoom"
      gui_mode ("3D");
    case "None"
      gui_mode ("None");
  endswitch
endfunction