Object.cc

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/*

Copyright (C) 2011-2018 Michael Goffioul

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 <QString>
#include <QVariant>

#include "Backend.h"
#include "Object.h"
#include "QtHandlesUtils.h"

namespace QtHandles
{

  Object::Object (const graphics_object& go, QObject *obj)
    : QObject (), m_go (go), m_handle (go.get_handle ()), m_qobject (nullptr)
  {
    gh_manager::auto_lock lock (false);

    if (! lock)
      qCritical ("QtHandles::Object::Object: "
                 "creating Object (h=%g) without a valid lock!!!",
                 m_handle.value ());

    init (obj);
  }

  void
  Object::init (QObject *obj, bool)
  {
    if (m_qobject)
      qCritical ("QtHandles::Object::init: "
                 "resetting QObject while in invalid state");

    m_qobject = obj;

    if (m_qobject)
      {
        m_qobject->setProperty ("QtHandles::Object",
                                qVariantFromValue<void*> (this));
        connect (m_qobject, SIGNAL (destroyed (QObject*)),
                 SLOT (objectDestroyed (QObject*)));
      }
  }

  Object::~Object (void)
  { }

  graphics_object
  Object::object (void) const
  {
    gh_manager::auto_lock lock (false);

    if (! lock)
      qCritical ("QtHandles::Object::object: "
                 "accessing graphics object (h=%g) without a valid lock!!!",
                 m_handle.value ());

    return m_go;
  }

  void
  Object::slotUpdate (int pId)
  {
    gh_manager::auto_lock lock;

    switch (pId)
      {
      // Special case for objects being deleted, as it's very likely
      // that the graphics_object already has been destroyed when this
      // is executed (because of the async behavior).
      case base_properties::ID_BEINGDELETED:
        beingDeleted ();
        break;

      default:
        if (object ().valid_object ())
          update (pId);
        break;
      }
  }

  void
  Object::slotFinalize (void)
  {
    gh_manager::auto_lock lock;

    finalize ();
  }

  void
  Object::slotRedraw (void)
  {
    gh_manager::auto_lock lock;

    if (object ().valid_object ())
      redraw ();
  }

  void
  Object::slotPrint (const QString& file_cmd, const QString& term)
  {
    gh_manager::auto_lock lock;

    if (object ().valid_object ())
      print (file_cmd, term);
  }

  void
  Object::update (int /* pId */)
  { }

  void
  Object::finalize (void)
  {
    if (m_qobject)
      {
        delete m_qobject;
        m_qobject = nullptr;
      }
    deleteLater ();
  }

  void
  Object::redraw (void)
  { }

  void
  Object::print (const QString& /* file_cmd */, const QString& /* term */)
  { }

  void
  Object::beingDeleted (void)
  { }

  void Object::objectDestroyed (QObject *obj)
  {
    if (obj && obj == m_qobject)
      m_qobject = nullptr;
  }

  Object*
  Object::parentObject (const graphics_object& go)
  {
    gh_manager::auto_lock lock;

    Object *parent = Backend::toolkitObject
                     (gh_manager::get_object (go.get_parent ()));

    return parent;
  }

  Object*
  Object::fromQObject (QObject *obj)
  {
    QVariant v = obj->property ("QtHandles::Object");

    if (v.isValid ())
      return reinterpret_cast<Object *> (qvariant_cast<void*> (v));

    return nullptr;
  }

}