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// ************************************************************************** //
//
// BornAgain: simulate and fit scattering at grazing incidence
//
//! @file GUI/coregui/Views/CommonWidgets/SessionItemController.cpp
//! @brief Implements 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)
//
// ************************************************************************** //
#include "GUI/coregui/Views/CommonWidgets/SessionItemController.h"
#include "GUI/coregui/Models/SessionItem.h"
#include "GUI/coregui/utils/GUIHelpers.h"
SessionItemController::SessionItemController(QObject* prt)
: QObject(prt), m_item(nullptr), m_parent_subscribed(false)
{
ASSERT(parent());
}
SessionItemController::~SessionItemController()
{
onControllerDestroy();
}
void SessionItemController::setItem(SessionItem* item)
{
if (m_item == item)
return;
if (m_item) {
m_item->mapper()->unsubscribe(this);
unsubscribe();
}
m_item = item;
if (!m_item)
return;
m_item->mapper()->setOnItemDestroy([this](SessionItem*) { onItemDestroy(); }, this);
}
SessionItem* SessionItemController::currentItem()
{
return m_item;
}
void SessionItemController::setSubscribeCallback(callback_t fun)
{
m_subscribe_callback = fun;
}
void SessionItemController::setUnsubscribeCallback(callback_t fun)
{
m_unsubscribe_callback = fun;
}
//! Subscribe parent to item's signals.
void SessionItemController::subscribe()
{
if (!m_item)
return;
if (!m_parent_subscribed)
subscribeParent();
}
//! Fully unsubscribes the parent from listening item's signals.
//! Controller stays active to track item destruction.
void SessionItemController::unsubscribe()
{
if (!m_item)
return;
if (m_parent_subscribed)
unsubscribeParent();
m_item->mapper()->unsubscribe(parent());
}
void SessionItemController::onItemDestroy()
{
if (m_parent_subscribed)
unsubscribeParent();
m_item = nullptr;
}
void SessionItemController::onControllerDestroy()
{
if (m_item) {
m_item->mapper()->unsubscribe(this);
m_item->mapper()->unsubscribe(parent());
}
}
void SessionItemController::subscribeParent()
{
ASSERT(m_subscribe_callback);
ASSERT(m_parent_subscribed == false);
m_subscribe_callback();
m_parent_subscribed = true;
}
//! Calls additional callback on un
void SessionItemController::unsubscribeParent()
{
ASSERT(m_unsubscribe_callback);
ASSERT(m_parent_subscribed == true);
m_unsubscribe_callback();
m_parent_subscribed = false;
}
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