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/************************************************************************
*
* Copyright (C) 2009-2023 IRCAD France
* Copyright (C) 2012-2017 IHU Strasbourg
*
* This file is part of Sight.
*
* Sight is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sight is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
#include "ui/history/undo_redo_manager.hpp"
#include <core/spy_log.hpp>
namespace sight::ui::history
{
//-----------------------------------------------------------------------------
undo_redo_manager::undo_redo_manager(std::size_t _max_memory, std::size_t _max_commands) :
m_max_memory(_max_memory),
m_max_commands(_max_commands == 0 ? 1 : _max_commands)
{
SIGHT_ASSERT("The number of commands must be greater than 0", _max_commands > 0);
}
//-----------------------------------------------------------------------------
bool undo_redo_manager::enqueue(command::sptr _cmd)
{
if(m_max_memory == 0)
{
SIGHT_WARN("Cannot add a command because maxMemory is 0.");
return false;
}
if(_cmd->size() > m_max_memory)
{
SIGHT_WARN("The current command is bigger than the maximum history size");
return false;
}
// Remove all commands following the current history point.
if(!m_command_queue.empty())
{
for(std::size_t i = m_command_queue.size() - 1 ; i > std::size_t(m_command_index) ; --i)
{
m_used_memory -= m_command_queue[i]->size();
m_command_queue.pop_back();
}
}
// Remove the oldest command if we reached the maximum number of commands.
if(m_max_commands == m_command_queue.size())
{
pop_front();
}
// Remove the oldest commands if we reached the maximum history size.
while(m_used_memory + _cmd->size() > m_max_memory)
{
pop_front();
}
m_command_queue.push_back(_cmd);
m_used_memory += _cmd->size();
m_command_index = static_cast<std::int64_t>(m_command_queue.size() - 1);
return true;
}
//-----------------------------------------------------------------------------
bool undo_redo_manager::redo()
{
bool success = false;
if(std::size_t(m_command_index) != m_command_queue.size() - 1)
{
m_command_index++;
success = m_command_queue[std::size_t(m_command_index)]->redo();
}
return success;
}
//-----------------------------------------------------------------------------
bool undo_redo_manager::undo()
{
bool success = false;
if(m_command_index > -1)
{
success = m_command_queue[std::size_t(m_command_index)]->undo();
m_command_index--;
}
return success;
}
//-----------------------------------------------------------------------------
bool undo_redo_manager::can_undo() const
{
return m_command_index > -1;
}
//-----------------------------------------------------------------------------
bool undo_redo_manager::can_redo() const
{
return (std::size_t(m_command_index) != this->get_command_count() - 1) && (this->get_command_count() > 0);
}
//-----------------------------------------------------------------------------
void undo_redo_manager::clear()
{
m_command_queue.clear();
m_command_index = -1;
m_used_memory = 0;
}
//-----------------------------------------------------------------------------
std::size_t undo_redo_manager::get_command_count() const
{
return m_command_queue.size();
}
//-----------------------------------------------------------------------------
void undo_redo_manager::set_command_count(std::size_t _cmd_count)
{
this->clear();
m_max_commands = _cmd_count;
}
//-----------------------------------------------------------------------------
std::size_t undo_redo_manager::get_history_size() const
{
return m_used_memory;
}
//-----------------------------------------------------------------------------
void undo_redo_manager::set_history_size(std::size_t _hist_size)
{
this->clear();
m_max_memory = _hist_size;
}
//-----------------------------------------------------------------------------
void undo_redo_manager::pop_front()
{
auto it = m_command_queue.begin();
m_used_memory -= (*it)->size();
m_command_queue.pop_front();
}
//-----------------------------------------------------------------------------
} // namespace sight::ui::history
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