LibrePCB

/*
 * LibrePCB - Professional EDA for everyone!
 * Copyright (C) 2013 LibrePCB Developers, see AUTHORS.md for contributors.
 * https://librepcb.org/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*******************************************************************************
 *  Includes
 ******************************************************************************/
#include "undocommand.h"

#include <librepcb/core/exceptions.h>

#include <QtCore>

/*******************************************************************************
 *  Namespace
 ******************************************************************************/
namespace librepcb {
namespace editor {

/*******************************************************************************
 *  Constructors / Destructor
 ******************************************************************************/

UndoCommand::UndoCommand(const QString& text) noexcept
  : mText(text), mIsExecuted(false), mRedoCount(0), mUndoCount(0) {
}

UndoCommand::~UndoCommand() noexcept {
  Q_ASSERT(qAbs(mRedoCount - mUndoCount) <= 1);
}

/*******************************************************************************
 *  General Methods
 ******************************************************************************/

bool UndoCommand::execute() {
  if (mIsExecuted) {
    throw LogicError(__FILE__, __LINE__);
  }

  mIsExecuted = true;  // set this flag BEFORE performing the execution!
  bool retval = performExecute();  // can throw
  mRedoCount++;

  return retval;
}

void UndoCommand::undo() {
  if (!isCurrentlyExecuted()) {
    throw LogicError(__FILE__, __LINE__);
  }

  performUndo();  // can throw
  mUndoCount++;
}

void UndoCommand::redo() {
  if ((!wasEverExecuted()) || (isCurrentlyExecuted())) {
    throw LogicError(__FILE__, __LINE__);
  }

  performRedo();  // can throw
  mRedoCount++;
}

/*******************************************************************************
 *  End of File
 ******************************************************************************/

}  // namespace editor
}  // namespace librepcb