QTfrontend/ui/widget/HistoryLineEdit.h
author sheepluva
Wed, 19 Oct 2011 16:10:18 +0200
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permissions -rw-r--r--
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/*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2006-2007 Igor Ulyanov <iulyanov@gmail.com>
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 * Copyright (c) 2007-2011 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 */
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#ifndef HEDGEWARS_HISTORYLINEEDIT
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#define HEDGEWARS_HISTORYLINEEDIT
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#include <QLineEdit>
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#include <QString>
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#include <QKeyEvent>
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#include <QMutex>
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class QLineEdit;
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/**
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 * A modification of QLineEdit that features:
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 * + History of previous contents, re-selectable using the arrow keys.
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 *
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 * Note:
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 *   * Public methods for accessing history are thread-safe.
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 * @author sheepluva
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 * @since 0.9.17
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 */
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class HistoryLineEdit : public QLineEdit
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{
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 Q_OBJECT
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public:
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    /**
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    * Class constructor.
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    * @param parent parent QWidget.
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    * @param maxHistorySize maximum amount of history entries kept.
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    */
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    HistoryLineEdit(QWidget * parent = 0, int maxHistorySize = 64);
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    /**
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     * Appends current text to history (if not only whitespaces);
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     */
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    void rememberCurrentText();
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    /**
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     * Forget all history.
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     */
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    void reset();
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public slots:
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    /**
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     * Clears the contents.
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     */
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    void clear();
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protected:
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    /**
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     * Overrides method of parent class.
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     * Arrow keys are used for navigating the history.
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     * All other keys are forwarded to the parent's method.
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     * @param event the key event.
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     */
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    virtual void keyPressEvent(QKeyEvent * event);
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private:
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    int m_maxHistorySize; // the maximum allowed size for the history
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    int m_curHistEntryIdx; // the index of the displayed used entry
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    QStringList * m_history; // history of previous inputs
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    QMutex m_historyMutex; // make history QStringList action thread-safe
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    /**
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     * Navigates content history in the desired direction.
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     * Note: no wrap-around on purpose (so that holding down/up will get the
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     * the user to the respective end rather than into an endless cycle :P)
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     * @param isGoingUp true: next older entry, false: next more recent entry.
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     */
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    void navigateHistory(bool isGoingUp);
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    /**
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     * Appends current text to history, without Mutex.
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     */
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    void rememberCurrentTextUnsynced();
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};
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#endif // HEDGEWARS_HISTORYLINEEDIT