insertnewitemcommand.cpp

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//  ************************************************************************************************
//
//  qt-mvvm: Model-view-view-model framework for large GUI applications
//
//! @file      mvvm/model/mvvm/commands/insertnewitemcommand.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/commands/insertnewitemcommand.h"
#include "mvvm/model/path.h"
#include "mvvm/model/sessionitem.h"
#include <sstream>
 
using namespace ModelView;
 
namespace {
std::string generate_description(const std::string& modelType, const TagRow& tagrow);
} // namespace
 
struct InsertNewItemCommand::InsertNewItemCommandImpl {
    item_factory_func_t factory_func;
    TagRow tagrow;
    Path item_path;
    std::string initial_identifier;
    InsertNewItemCommandImpl(item_factory_func_t func, TagRow tagrow)
        : factory_func(std::move(func)), tagrow(std::move(tagrow))
    {
    }
};
 
InsertNewItemCommand::InsertNewItemCommand(item_factory_func_t func, SessionItem* parent,
                                           const TagRow& tagrow)
    : AbstractItemCommand(parent), p_impl(std::make_unique<InsertNewItemCommandImpl>(func, tagrow))
{
    setResult(nullptr);
    p_impl->item_path = pathFromItem(parent);
}
 
InsertNewItemCommand::~InsertNewItemCommand() = default;
 
void InsertNewItemCommand::undo_command()
{
    auto parent = itemFromPath(p_impl->item_path);
    auto item = parent->takeItem(p_impl->tagrow);
    // saving identifier for later redo
    if (p_impl->initial_identifier.empty())
        p_impl->initial_identifier = item->identifier();
    delete item;
    setResult(nullptr);
}
 
void InsertNewItemCommand::execute_command()
{
    auto parent = itemFromPath(p_impl->item_path);
    auto child = p_impl->factory_func().release();
    // here we restore original identifier to get exactly same item on consequitive undo/redo
    if (!p_impl->initial_identifier.empty())
        child->setData(QVariant::fromValue(p_impl->initial_identifier), ItemDataRole::IDENTIFIER,
                       /*direct*/ true);
 
    setDescription(generate_description(child->modelType(), p_impl->tagrow));
    if (parent->insertItem(child, p_impl->tagrow)) {
        setResult(child);
    } else {
        delete child;
        setObsolete(true);
    }
}
 
namespace {
std::string generate_description(const std::string& modelType, const TagRow& tagrow)
{
    std::ostringstream ostr;
    ostr << "New item type '" << modelType << "' tag:'" << tagrow.tag << "', row:" << tagrow.row;
    return ostr.str();
}
} // namespace