/*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2006-2007 Igor Ulyanov <iulyanov@gmail.com>

 *

 * 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; version 2 of the License

 *

 * 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 */

/**

 * @file

 * @brief HistoryLineEdit class definition

 */

#ifndef HEDGEWARS_HISTORYLINEEDIT

#define HEDGEWARS_HISTORYLINEEDIT

#include <QStringList>

#include <QString>

#include <QLineEdit>

#include <QKeyEvent>

class QLineEdit;

/**

 * @brief <code>QLineEdit</code> that features a history of previous contents,

 *        re-selectable using the arrow keys.

 *

 * @author sheepluva

 * @since 0.9.17

 */

class HistoryLineEdit : public QLineEdit

{

        Q_OBJECT

    public:

        /**

        * @brief Class constructor.

        * @param parent parent QWidget.

        * @param maxHistorySize maximum amount of history entries kept.

        */

        HistoryLineEdit(QWidget * parent = 0, int maxHistorySize = 64);

        /**

        * @brief Class destructor.

        */

        ~HistoryLineEdit();

        /**

         * @brief Appends current text to history (if not only whitespaces);

         */

        void rememberCurrentText();

        /**

         * @brief Forget all history.

         */

        void reset();

    public slots:

        /**

         * @brief Clears the contents.

         */

        void clear();

    protected:

        /**

         * @brief Overrides method of parent class.

         * Arrow keys are used for navigating the history.

         *

         * All other keys are forwarded to the parent's method.

         *

         * @param event the key event.

         */

        virtual void keyPressEvent(QKeyEvent * event);

    private:

        int m_maxHistorySize; ///< the maximum allowed size for the history

        int m_curHistEntryIdx; ///< the index of the displayed used entry

        QStringList * m_history; ///< history of previous inputs

        /**

         * @brief Navigates content history in the desired direction.

         *

         * Note: no wrap-around on purpose (so that holding down/up will get the

         * the user to the respective end rather than into an endless cycle :P)

         *

         * @param isGoingUp true: next older entry, false: next more recent entry.

         */

        void navigateHistory(bool isGoingUp);

};

#endif // HEDGEWARS_HISTORYLINEEDIT