diff -r 62aa418ed214 -r 6fe3e922246e QTfrontend/util/SDLInteraction.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/QTfrontend/util/SDLInteraction.h	Fri Oct 21 07:00:49 2011 +0200
@@ -0,0 +1,94 @@
+/*
+ * Hedgewars, a free turn based strategy game
+ * 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_SDLINTERACTION_H
+#define HEDGEWARS_SDLINTERACTION_H
+
+
+#include <QMap>
+#include <QStringList>
+
+#include "SDL_mixer.h"
+
+/**
+ * @brief Class for interacting with SDL (used for music and keys)
+ * 
+ * @see <a href="http://en.wikipedia.org/wiki/Singleton_pattern">singleton pattern</a>
+ */
+class SDLInteraction
+{
+
+private:
+    /**
+     * @brief Class constructor of the <i>singleton</i>.
+     * 
+     * Not to be used from outside the class,
+     * use the static {@link HWDataManager::instance()} instead.
+     * 
+     * @see <a href="http://en.wikipedia.org/wiki/Singleton_pattern">singleton pattern</a>
+     */
+    SDLInteraction();
+
+    /// Initializes SDL for sound output if needed.
+    void SDLSoundInit();
+
+    Mix_Music *music;
+    int musicInitialized;
+
+    QMap<QString,Mix_Chunk*> * soundMap; ///< maps sound file paths to channel
+
+public:
+    /**
+     * @brief Returns reference to the <i>singleton</i> instance of this class.
+     * 
+     * @see <a href="http://en.wikipedia.org/wiki/Singleton_pattern">singleton pattern</a>
+     * 
+     * @return reference to the instance.
+     */
+    static SDLInteraction & instance();
+
+    /// Class Destructor.
+    ~SDLInteraction();
+
+    /**
+     * @brief Returns available (screen) resolutions.
+     *
+     * @return list of resolutions in the format WIDTHxHEIGHT.
+     */
+    QStringList getResolutions() const;
+
+    /// Adds all available joystick controlls to the list of SDL keys.
+    void addGameControllerKeys() const;
+
+    /**
+     * @brief Plays a sound file.
+     * 
+     * @param soundFile path of the sound file.
+     */
+    void playSoundFile(const QString & soundFile);
+
+    /// Starts the background music.
+    void startMusic();
+
+    /// Fades out and stops the background music.
+    void stopMusic();
+};
+
+
+#endif //HEDGEWARS_SDLINTERACTION_H
+