/*
 * Hedgewars, a free turn based strategy game
 * Copyright (c) 2006-2007 Igor Ulyanov <iulyanov@gmail.com>
 * Copyright (c) 2004-2014 Andrey Korotaev <unC0Rr@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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  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