SessionItemController.h

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//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      GUI/View/Common/SessionItemController.h
//! @brief     Defines class SessionItemController
//!
//! @homepage  http://www.bornagainproject.org
//! @license   GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors   Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
//  ************************************************************************************************
 
#ifndef BORNAGAIN_GUI_VIEW_COMMON_SESSIONITEMCONTROLLER_H
#define BORNAGAIN_GUI_VIEW_COMMON_SESSIONITEMCONTROLLER_H
 
#include <QObject>
#include <functional>
 
class SessionItem;
 
//! Provides subscribe/unsubscribe mechanism for any QObject to track
//! time of life of SessionItem. Mainly intended for SessionItemWidget.
 
class SessionItemController : public QObject {
    Q_OBJECT
public:
    using callback_t = std::function<void(void)>;
 
    explicit SessionItemController(QObject* prt);
    ~SessionItemController() override;
 
    void setItem(SessionItem* item);
 
    SessionItem* currentItem();
 
    void setSubscribeCallback(callback_t fun);
    void setUnsubscribeCallback(callback_t fun);
 
    void subscribe();
    void unsubscribe();
 
private:
    void onItemDestroy();
    void onControllerDestroy();
    void subscribeParent();
    void unsubscribeParent();
 
    callback_t m_subscribe_callback;
    callback_t m_unsubscribe_callback;
    SessionItem* m_item;
    bool m_parent_subscribed;
};
 
#endif // BORNAGAIN_GUI_VIEW_COMMON_SESSIONITEMCONTROLLER_H