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diff --git a/src/wx/content_timeline_view.h b/src/wx/content_timeline_view.h
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+++ b/src/wx/content_timeline_view.h
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+/*
+    Copyright (C) 2013-2021 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic 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.
+
+    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#ifndef DCPOMATIC_CONTENT_TIMELINE_VIEW_H
+#define DCPOMATIC_CONTENT_TIMELINE_VIEW_H
+
+
+#include "timeline_view.h"
+#include "lib/rect.h"
+#include "lib/dcpomatic_time.h"
+
+
+class wxGraphicsContext;
+class ContentTimeline;
+
+
+/** @class ContentTimelineView
+ *  @brief Parent class for components of the content timeline (e.g. a piece of content or an axis).
+ */
+class ContentTimelineView : public TimelineView<ContentTimeline>
+{
+public:
+	explicit ContentTimelineView(ContentTimeline& t);
+	virtual ~ContentTimelineView () = default;
+
+	void paint(wxGraphicsContext* gc, std::list<dcpomatic::Rect<int>> overlaps)
+	{
+		_last_paint_bbox = bbox();
+		do_paint(gc, overlaps);
+	}
+
+protected:
+	virtual void do_paint(wxGraphicsContext *, std::list<dcpomatic::Rect<int>> overlaps) = 0;
+
+	int y_pos(int t) const;
+};
+
+
+typedef std::vector<std::shared_ptr<ContentTimelineView>> ContentTimelineViewList;
+
+
+#endif