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diff --git a/cinelerra-5.1/cinelerra/trackscroll.h b/cinelerra-5.1/cinelerra/trackscroll.h
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+
+/*
+ * CINELERRA
+ * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
+ * 
+ * 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.
+ * 
+ * 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 TRACKSCROLL_H
+#define TRACKSCROLL_H
+
+
+#include "guicast.h"
+#include "mwindow.inc"
+#include "mwindowgui.inc"
+#include "timelinepane.inc"
+
+class TrackScroll : public BC_ScrollBar
+{
+public:
+	TrackScroll(MWindow *mwindow, MWindowGUI *gui, int x, int y, int h);
+	TrackScroll(MWindow *mwindow, TimelinePane *pane, int x, int y, int h);
+	~TrackScroll();
+
+	void create_objects(int top, int bottom);
+	int resize_event();
+	int resize_event(int x, int y, int h);
+	int flip_vertical(int top, int bottom);
+	int update();               // reflect new track view
+	long get_distance();
+	int handle_event();
+	void set_position();
+
+	MWindowGUI *gui;
+	MWindow *mwindow;
+	TimelinePane *pane;
+	long old_position;
+};
+
+#endif