modelhaschangedcontroller.cpp

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//  ************************************************************************************************
//
//  qt-mvvm: Model-view-view-model framework for large GUI applications
//
//! @file      mvvm/model/mvvm/project/modelhaschangedcontroller.cpp
//! @brief     Implements class CLASS?
//!
//! @homepage  http://www.bornagainproject.org
//! @license   GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2020
//! @authors   Gennady Pospelov et al, Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
//  ************************************************************************************************
 
#include "mvvm/project/modelhaschangedcontroller.h"
 
using namespace ModelView;
 
//! Constructor of ModelHasChangedController.
//! Acccept 'model' to listen, and a 'callback' to report about changes in a model.
 
ModelHasChangedController::ModelHasChangedController(SessionModel* model, callback_t callback)
    : ModelListener(model), m_callback(callback)
{
    setOnDataChange([this](auto, auto) { process_change(); });
    setOnItemInserted([this](auto, auto) { process_change(); });
    setOnItemRemoved([this](auto, auto) { process_change(); });
    setOnModelReset([this](auto) { process_change(); });
}
 
//! Returns true if the model was changed since last call of resetChanged.
 
bool ModelHasChangedController::hasChanged() const
{
    return m_has_changed;
}
 
//! Reset has_changed flag.
 
void ModelHasChangedController::resetChanged()
{
    m_has_changed = false;
}
 
//! Sets 'has_changed' flag and reports back to client.
 
void ModelHasChangedController::process_change()
{
    m_has_changed = true;
    if (m_callback)
        m_callback();
}