setvaluecommand.cpp

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//  ************************************************************************************************
//
//  qt-mvvm: Model-view-view-model framework for large GUI applications
//
//! @file      mvvm/model/mvvm/commands/setvaluecommand.cpp
//! @brief     Defines 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/setvaluecommand.h"
#include "mvvm/core/variant.h"
#include "mvvm/model/modelutils.h"
#include "mvvm/model/path.h"
#include "mvvm/model/sessionitem.h"
#include <sstream>
 
namespace {
std::string generate_description(const std::string& str, int role);
} // namespace
 
using namespace ModelView;
 
struct SetValueCommand::SetValueCommandImpl {
    Variant m_value; //! Value to set as a result of command execution.
    int m_role;
    Path m_item_path;
    SetValueCommandImpl(Variant value, int role) : m_value(std::move(value)), m_role(role) {}
};
 
// ----------------------------------------------------------------------------
 
SetValueCommand::SetValueCommand(SessionItem* item, Variant value, int role)
    : AbstractItemCommand(item)
    , p_impl(std::make_unique<SetValueCommandImpl>(std::move(value), role))
{
    setResult(false);
 
    setDescription(generate_description(p_impl->m_value.toString().toStdString(), role));
    p_impl->m_item_path = pathFromItem(item);
}
 
SetValueCommand::~SetValueCommand() = default;
 
void SetValueCommand::undo_command()
{
    swap_values();
}
 
void SetValueCommand::execute_command()
{
    swap_values();
}
 
void SetValueCommand::swap_values()
{
    auto item = itemFromPath(p_impl->m_item_path);
    auto old = item->data<Variant>(p_impl->m_role);
    auto result = item->setData(p_impl->m_value, p_impl->m_role, /*direct*/ true);
    setResult(result);
    setObsolete(!result);
    p_impl->m_value = old;
}
 
namespace {
std::string generate_description(const std::string& str, int role)
{
    std::ostringstream ostr;
    ostr << "Set value: " << str << ", role:" << role;
    return ostr.str();
}
} // namespace