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diff --git a/ui/qt/models/timeline_delegate.h b/ui/qt/models/timeline_delegate.h
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+/** @file
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef TIMELINE_DELEGATE_H
+#define TIMELINE_DELEGATE_H
+
+/*
+ * @file Timeline delegate.
+ *
+ * QStyledItemDelegate subclass that will draw a timeline indicator for
+ * the specified value.
+ *
+ * This is intended to be used in QTreeWidgets to show timelines, e.g. for
+ * conversations.
+ * To use it, first call setItemDelegate:
+ *
+ *   myTreeWidget()->setItemDelegateForColumn(col_time_start_, new TimelineDelegate());
+ *
+ * Then, for each QTreeWidgetItem, set or return a timeline_span for the start and end
+ * of the timeline in pixels relative to the column width.
+ *
+ *   setData(col_start_, Qt::UserRole, start_span);
+ *   setData(col_end_, Qt::UserRole, end_span);
+ *
+ */
+
+#include <QStyledItemDelegate>
+
+// Pixels are relative to item rect and will be clipped.
+struct timeline_span {
+    int start;
+    int width;
+
+    double startTime;
+    double stopTime;
+    double minRelTime;
+    double maxRelTime;
+
+    int colStart;
+    int colDuration;
+};
+
+Q_DECLARE_METATYPE(timeline_span)
+
+class TimelineDelegate : public QStyledItemDelegate
+{
+public:
+    TimelineDelegate(QWidget *parent = 0);
+
+    void setDataRole(int role);
+
+protected:
+    void paint(QPainter *painter, const QStyleOptionViewItem &option,
+               const QModelIndex &index) const;
+private:
+
+    int _dataRole;
+};
+
+#endif // TIMELINE_DELEGATE_H