/*
  propertycontrollerextension.h

  This file is part of GammaRay, the Qt application inspection and
  manipulation tool.

  Copyright (C) 2014-2015 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
  Author: Anton Kreuzkamp <anton.kreuzkamp@kdab.com>

  Licensees holding valid commercial KDAB GammaRay licenses may use this file in
  accordance with GammaRay Commercial License Agreement provided with the Software.

  Contact info@kdab.com if any conditions of this licensing are not clear to you.

  This program 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 2 of the License, or
  (at your option) any later version.

  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef PROPERTYCONTROLLEREXTENSION_H
#define PROPERTYCONTROLLEREXTENSION_H

#include "gammaray_core_export.h"

#include <QString>

class QObject;
struct QMetaObject;

namespace GammaRay {

class PropertyController;

/**
 * @brief Base-class for server-side property editor extensions.
 *
 * This can be used to add your own tabs to the property widget.
 * Re-implement the corresponding variant of setObject/setMetaObject
 * you can handle, the default implementations do nothing and return
 * @c false.
 *
 * @since 2.1
 */
class GAMMARAY_CORE_EXPORT PropertyControllerExtension
{
public:
  /** @brief Create a new property extension.
   *  @param name The extension identifier used for client/server communication.
   */
  explicit PropertyControllerExtension(const QString &name);
  virtual ~PropertyControllerExtension();

  /** @brief Sets the object that should be represented by this extension.
   *  This variant is used for non-QObject types using Gammaray::MetaObjectRepository.
   *  @return @c true if the extension can handle @p object, @c false otherwise.
   */
  virtual bool setObject(void *object, const QString &typeName);

  /** @brief Sets the QObject that should be represented by this extension.
   *  This variant is used for QObject-derived types.
   *  @return @c true if the extension can handle @p object, @c false otherwise.
   */
  virtual bool setQObject(QObject *object);

  /** @brief Sets the meta object that should be represented by this extension.
   *  This variant is used for QMetaObjects without a specific object instance.
   *  @return @c true if the extension can handle @p object, @c false otherwise.
   */
  virtual bool setMetaObject(const QMetaObject *metaObject);

  /** @brief Returns the identifier of this extension, used for client/server communication. */
  QString name() const;

private:
  QString m_name;
};

///@cond internal
class PropertyControllerExtensionFactoryBase {
  public:
    explicit PropertyControllerExtensionFactoryBase() {}
    virtual PropertyControllerExtension *create(PropertyController *controller) = 0;
};

template <typename T>
class PropertyControllerExtensionFactory : public PropertyControllerExtensionFactoryBase
{
  public:
    static PropertyControllerExtensionFactoryBase* instance()
    {
      if (!s_instance)
        s_instance = new PropertyControllerExtensionFactory<T>();
      return s_instance;
    }

    PropertyControllerExtension *create(PropertyController *controller) Q_DECL_OVERRIDE
    {
      return new T(controller);
    }

  private:
    explicit PropertyControllerExtensionFactory() {}
    static PropertyControllerExtensionFactory<T>* s_instance;
};

template <typename T>
PropertyControllerExtensionFactory<T>* PropertyControllerExtensionFactory<T>::s_instance = 0;
///@endcond

}

#endif // PROPERTYCONTROLLEREXTENSION_H
