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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   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+
+    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_QDEFERSCROLLVIEW_H_
+#define _RG_QDEFERSCROLLVIEW_H_
+
+#include <qscrollview.h>
+
+
+class QWidget;
+class QWheelEvent;
+
+
+namespace Rosegarden
+{
+
+
+
+/**
+ * A QScrollView which defers vertical scrolling (through mouse wheel)
+ * elsewhere, typically another QScrollView, so that both can be kept
+ * in sync. The master scrollview will connect its vertical scrollbar
+ * to the slave view so the scrollbar will act on both views.
+ *
+ * The slave scrollview will defer its scrolling to the master by
+ * having the gotWheelEvent() signal connected to a slot in the master
+ * scrollview, which will simply process the wheel event as if it had
+ * received it itself.
+ *
+ * @see TrackEditor
+ * @see SegmentCanvas
+ * @see TrackEditor::m_trackButtonScroll
+ */
+class QDeferScrollView : public QScrollView
+{
+    Q_OBJECT
+public:
+    QDeferScrollView(QWidget* parent=0, const char *name=0, WFlags f=0);
+
+    void setBottomMargin(int);
+
+signals:
+    void gotWheelEvent(QWheelEvent*);
+
+protected:
+    virtual void contentsWheelEvent(QWheelEvent*);
+    
+};
+
+
+}
+
+#endif