ModelMapper.h

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//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      GUI/Model/BaseItem/ModelMapper.h
//! @brief     Defines class ModelMapper
//!
//! @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_MODEL_BASEITEM_MODELMAPPER_H
#define BORNAGAIN_GUI_MODEL_BASEITEM_MODELMAPPER_H
 
#include <QModelIndex>
#include <functional>
 
class SessionModel;
class SessionItem;
 
class ModelMapper : public QObject {
    Q_OBJECT
 
public:
    ModelMapper(QObject* parent = nullptr);
 
    void setItem(SessionItem* item);
 
    void setOnValueChange(std::function<void(void)> f, const void* caller = nullptr);
 
    void setOnPropertyChange(std::function<void(QString)> f, const void* caller = nullptr);
    void setOnPropertyChange(std::function<void(SessionItem*, QString)> f,
                             const void* caller = nullptr);
 
    void setOnChildPropertyChange(std::function<void(SessionItem*, QString)> f,
                                  const void* caller = nullptr);
 
    void setOnChildrenChange(std::function<void(SessionItem*)> f, const void* caller = nullptr);
 
    void setActive(bool state) { m_active = state; }
 
    void setOnItemDestroy(std::function<void(SessionItem*)> f, const void* caller = nullptr);
 
    void setOnAboutToRemoveChild(std::function<void(SessionItem*)> f, const void* caller = nullptr);
 
    void unsubscribe(const void* caller);
 
    void callOnItemDestroy();
 
public slots:
    void onDataChanged(const QModelIndex& topLeft, const QModelIndex& bottomRight,
                       const QVector<int>& roles = {});
 
    void onRowsInserted(const QModelIndex& parent, int first, int last);
 
    void onBeginRemoveRows(const QModelIndex& parent, int first, int last);
 
    void onRowRemoved(const QModelIndex& parent, int first, int last);
 
private:
    //! removes all callbacks related to given caller
    template <class U>
    void clean_container(U& v, const void* caller);
 
    void setModel(SessionModel* model);
    int nestlingDepth(SessionItem* item, int level = 0);
 
    void callOnValueChange();
    void callOnPropertyChange(const QString& name);
    void callOnChildPropertyChange(SessionItem* item, const QString& name);
    void callOnChildrenChange(SessionItem* item);
    void callOnAboutToRemoveChild(SessionItem* item);
 
    void clearMapper();
 
    bool m_active;
    SessionModel* m_model;
    SessionItem* m_item;
 
    using call_t = std::pair<std::function<void(void)>, const void*>;
    using call_str_t = std::pair<std::function<void(QString)>, const void*>;
    using call_item_t = std::pair<std::function<void(SessionItem*)>, const void*>;
    using call_item_str_t = std::pair<std::function<void(SessionItem*, QString)>, const void*>;
 
    std::vector<call_t> m_onValueChange;
    std::vector<call_item_str_t> m_onPropertyChange;
    std::vector<call_item_str_t> m_onChildPropertyChange;
    std::vector<call_item_t> m_onChildrenChange;
    std::vector<call_item_t> m_onItemDestroy;
    std::vector<call_item_t> m_onAboutToRemoveChild;
    QModelIndex m_aboutToDelete;
};
 
template <class U>
inline void ModelMapper::clean_container(U& v, const void* caller)
{
    v.erase(std::remove_if(
                v.begin(), v.end(),
                [caller](typename U::value_type const& x) -> bool { return (x.second == caller); }),
            v.end());
}
 
#endif // BORNAGAIN_GUI_MODEL_BASEITEM_MODELMAPPER_H