diff -r 1d98752c1fba -r 9fd5b70acb1a QTfrontend/ui/widget/HistoryLineEdit.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/QTfrontend/ui/widget/HistoryLineEdit.h	Wed Oct 19 16:10:18 2011 +0200
@@ -0,0 +1,105 @@
+/*
+ * Hedgewars, a free turn based strategy game
+ * Copyright (c) 2006-2007 Igor Ulyanov <iulyanov@gmail.com>
+ * Copyright (c) 2007-2011 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#ifndef HEDGEWARS_HISTORYLINEEDIT
+#define HEDGEWARS_HISTORYLINEEDIT
+
+#include <QLineEdit>
+#include <QString>
+
+#include <QKeyEvent>
+
+#include <QMutex>
+
+class QLineEdit;
+
+/**
+ * A modification of QLineEdit that features:
+ * + History of previous contents, re-selectable using the arrow keys.
+ *
+ * Note:
+ *   * Public methods for accessing history are thread-safe.
+ * @author sheepluva
+ * @since 0.9.17
+ */
+class HistoryLineEdit : public QLineEdit
+{
+ Q_OBJECT
+
+public:
+    /**
+    * Class constructor.
+    * @param parent parent QWidget.
+    * @param maxHistorySize maximum amount of history entries kept.
+    */
+    HistoryLineEdit(QWidget * parent = 0, int maxHistorySize = 64);
+
+    /**
+     * Appends current text to history (if not only whitespaces);
+     */
+    void rememberCurrentText();
+
+    /**
+     * Forget all history.
+     */
+    void reset();
+
+
+public slots:
+    /**
+     * Clears the contents.
+     */
+    void clear();
+
+
+protected:
+    /**
+     * 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
+
+    QMutex m_historyMutex; // make history QStringList action thread-safe
+
+    /**
+     * 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);
+
+    /**
+     * Appends current text to history, without Mutex.
+     */
+    void rememberCurrentTextUnsynced();
+};
+
+
+
+#endif // HEDGEWARS_HISTORYLINEEDIT