////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2011-2020 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// 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
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <QMenu>

#include "ContextMenu.h"
#include "QtHandlesUtils.h"
#include "qt-graphics-toolkit.h"

#include "octave-qobject.h"

#include "interpreter.h"

namespace QtHandles
{

  ContextMenu*
  ContextMenu::create (octave::base_qobject& oct_qobj,
                       octave::interpreter& interp, const graphics_object& go)
  {
    Object *xparent = parentObject (interp, go);

    if (xparent)
      {
        QWidget *w = xparent->qWidget<QWidget> ();

        return new ContextMenu (oct_qobj, interp, go, new QMenu (w));
      }

    return nullptr;
  }

  ContextMenu::ContextMenu (octave::base_qobject& oct_qobj,
                            octave::interpreter& interp,
                            const graphics_object& go, QMenu *xmenu)
    : Object (oct_qobj, interp, go, xmenu)
  {
    xmenu->setAutoFillBackground (true);

    connect (xmenu, SIGNAL (aboutToShow (void)), SLOT (aboutToShow (void)));
    connect (xmenu, SIGNAL (aboutToHide (void)), SLOT (aboutToHide (void)));
  }

  ContextMenu::~ContextMenu (void)
  { }

  void
  ContextMenu::update (int pId)
  {
    uicontextmenu::properties& up = properties<uicontextmenu> ();
    QMenu *xmenu = qWidget<QMenu> ();

    switch (pId)
      {
      case base_properties::ID_VISIBLE:
        if (up.is_visible ())
          {
            Matrix pos = up.get_position ().matrix_value ();
            QWidget *parentW = xmenu->parentWidget ();
            QPoint pt;

            pt.rx () = octave::math::round (pos(0));
            pt.ry () = parentW->height () - octave::math::round (pos(1));
            pt = parentW->mapToGlobal (pt);

            xmenu->popup (pt);
          }
        else
          xmenu->hide ();
        break;
      default:
        Object::update (pId);
        break;
      }
  }

  void
  ContextMenu::aboutToShow (void)
  {
    emit gh_callback_event (m_handle, "callback");
    emit gh_set_event (m_handle, "visible", "on", false);
  }

  void
  ContextMenu::aboutToHide (void)
  {
    emit gh_set_event (m_handle, "visible", "off", false);
  }

  QWidget*
  ContextMenu::menu (void)
  {
    return qWidget<QWidget> ();
  }

  void
  ContextMenu::executeAt (octave::interpreter& interp,
                          const base_properties& props, const QPoint& pt)
  {
    graphics_handle h = props.get_uicontextmenu ();

    if (h.ok ())
      {
        gh_manager& gh_mgr = interp.get_gh_manager ();
        octave::autolock guard (gh_mgr.graphics_lock ());

        graphics_object go = gh_mgr.get_object (h);

        if (go.valid_object ())
          {
            ContextMenu *cMenu =
              dynamic_cast<ContextMenu *> (qt_graphics_toolkit::toolkitObject (go));

            if (cMenu)
              {
                QMenu *menu = cMenu->qWidget<QMenu> ();

                if (menu)
                  menu->popup (pt);
              }
          }
      }
  }

}