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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file GUI/coregui/Views/CommonWidgets/ItemStackPresenter.h
//! @brief Defines class ItemStackPresenter
//!
//! @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_COREGUI_VIEWS_COMMONWIDGETS_ITEMSTACKPRESENTER_H
#define BORNAGAIN_GUI_COREGUI_VIEWS_COMMONWIDGETS_ITEMSTACKPRESENTER_H
#include "Base/Utils/Assert.h"
#include "GUI/coregui/Views/CommonWidgets/ItemStackWidget.h"
#include <QDebug>
#include <QMap>
#include <QStackedWidget>
class SessionItem;
//! The ItemStackPresenter templated class extends ItemStackWidget so it could operate with
//! SesionItem editor's of specified type, while still keeping signal/slots alive.
template <class T> class ItemStackPresenter : public ItemStackWidget {
public:
ItemStackPresenter(bool single_widget = false) : m_single_widget(single_widget) {}
//! Shows the widget for given item (and hides previous one).
//! If no widget yet exists, it will be created (flag isNew will become 'true' in this case).
template <class U> void setItem(U* item, bool* isNew = 0);
T* currentWidget();
T* itemWidget(SessionItem* item);
void hideWidgets();
protected:
void removeWidgetForItem(SessionItem* item);
void removeWidgets();
private:
QMap<SessionItem*, T*> m_itemToWidget;
bool m_single_widget; //!< Different items will be served by same widget
};
template <class T> template <class U> void ItemStackPresenter<T>::setItem(U* item, bool* isNew)
{
validateItem(item);
if (isNew)
*isNew = false;
if (!item) {
hideWidgets();
return;
}
T* widget = itemWidget(item);
if (!widget) {
widget = new T();
if (isNew)
*isNew = true;
m_stackedWidget->addWidget(widget);
m_itemToWidget[item] = widget;
}
m_stackedWidget->setCurrentWidget(widget);
if (widget->isHidden())
widget->show();
widget->setItem(item);
}
template <class T> T* ItemStackPresenter<T>::currentWidget()
{
return dynamic_cast<T*>(m_stackedWidget->currentWidget());
}
template <class T> T* ItemStackPresenter<T>::itemWidget(SessionItem* item)
{
if (m_single_widget) {
if (!m_itemToWidget.empty())
return m_itemToWidget.first();
} else {
return m_itemToWidget[item];
}
return nullptr;
}
template <class T> void ItemStackPresenter<T>::hideWidgets()
{
if (m_stackedWidget->currentWidget())
m_stackedWidget->currentWidget()->hide();
}
template <class T> void ItemStackPresenter<T>::removeWidgetForItem(SessionItem* item)
{
ASSERT(item);
if (m_single_widget)
return;
T* widget = m_itemToWidget[item];
if (!widget)
return;
typename QMap<SessionItem*, T*>::iterator it = m_itemToWidget.begin();
while (it != m_itemToWidget.end()) {
if (it.value() == widget)
it = m_itemToWidget.erase(it);
else
++it;
}
m_stackedWidget->removeWidget(widget);
delete widget;
}
template <class T> void ItemStackPresenter<T>::removeWidgets()
{
typename QMap<SessionItem*, T*>::iterator it = m_itemToWidget.begin();
while (it != m_itemToWidget.end()) {
m_stackedWidget->removeWidget(it.value());
delete it.value();
++it;
}
m_itemToWidget.clear();
}
#endif // BORNAGAIN_GUI_COREGUI_VIEWS_COMMONWIDGETS_ITEMSTACKPRESENTER_H
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