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diff --git a/src/util/ege-appear-time-tracker.h b/src/util/ege-appear-time-tracker.h
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+++ b/src/util/ege-appear-time-tracker.h
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+// SPDX-License-Identifier: GPL-2.0-or-later OR MPL-1.1 OR LGPL-2.1-or-later
+#ifndef SEEN_APPEAR_TIME_TRACKER_H
+#define SEEN_APPEAR_TIME_TRACKER_H
+
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Appear Time Tracker.
+ *
+ * The Initial Developer of the Original Code is
+ * Jon A. Cruz.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include <glib.h>
+#include <glibmm/ustring.h>
+
+typedef union _GdkEvent GdkEvent;
+typedef struct _GtkWidget GtkWidget;
+
+namespace ege
+{
+
+class AppearTimeTracker {
+public:
+    AppearTimeTracker(GTimer *timer, GtkWidget *widget, gchar const* name);
+    ~AppearTimeTracker();
+
+    void stop();
+
+    bool isAutodelete() const { return _autodelete; }
+    void setAutodelete(bool autodelete);
+
+private:
+    Glib::ustring _name;
+    GTimer *_timer;
+    GtkWidget *_widget;
+    GtkWidget *_topMost;
+    bool _autodelete;
+    gulong _mapId;
+    gulong _realizeId;
+    gulong _hierarchyId;
+
+    static gboolean mapCB(GtkWidget *widget, GdkEvent *event, gpointer userData);
+    static void realizeCB(GtkWidget *widget, gpointer userData);
+    static void hierarchyCB(GtkWidget *widget, GtkWidget *prevTop, gpointer userData);
+
+    void report(gchar const* msg);
+    void handleHierarchyChange( GtkWidget *prevTop );
+};
+
+} // namespace ege
+
+#endif // SEEN_APPEAR_TIME_TRACKER_H
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :