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+
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <glaurent@telegraph-road.org>,
+        Chris Cannam        <cannam@all-day-breakfast.com>,
+        Richard Bown        <richard.bown@ferventsoftware.com>
+
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+
+    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; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _RG_AUDIOPREVIEWUPDATER_H_
+#define _RG_AUDIOPREVIEWUPDATER_H_
+
+#include <qobject.h>
+#include <qrect.h>
+#include <vector>
+
+
+class QEvent;
+
+
+namespace Rosegarden
+{
+
+class Segment;
+class CompositionModelImpl;
+class Composition;
+class AudioPreviewThread;
+
+
+class AudioPreviewUpdater : public QObject
+{
+    Q_OBJECT
+
+public:
+    AudioPreviewUpdater(AudioPreviewThread &thread,
+                        const Composition &composition,
+                        const Segment *segment,
+                        const QRect &displayExtent,
+                        CompositionModelImpl *parent);
+    ~AudioPreviewUpdater();
+
+    void update();
+    void cancel();
+
+    QRect getDisplayExtent() const { return m_rect; }
+    void setDisplayExtent(const QRect &rect) { m_rect = rect; }
+
+    const Segment *getSegment() const { return m_segment; }
+
+    const std::vector<float> &getComputedValues(unsigned int &channels) const
+    { channels = m_channels; return m_values; }
+
+signals:
+    void audioPreviewComplete(AudioPreviewUpdater*);
+
+protected:
+    virtual bool event(QEvent*);
+
+    AudioPreviewThread& m_thread;
+
+    const Composition& m_composition;
+    const Segment*     m_segment;
+    QRect                          m_rect;
+    bool                           m_showMinima;
+    unsigned int                   m_channels;
+    std::vector<float>             m_values;
+
+    intptr_t m_previewToken;
+};
+
+
+}
+
+#endif