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diff --git a/src/layer-model.h b/src/layer-model.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_INKSCAPE_LAYER_MODEL_H
+#define SEEN_INKSCAPE_LAYER_MODEL_H
+
+/*
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Frank Felfe <innerspace@iname.com>
+ *   bulia byak <buliabyak@users.sf.net>
+ *   Ralf Stephan <ralf@ark.in-berlin.de>
+ *   John Bintz <jcoswell@coswellproductions.org>
+ *   Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
+ *   Jon A. Cruz <jon@joncruz.org>get
+ *   Abhishek Sharma
+ *   Eric Greveson <eric@greveson.co.uk>
+ *
+ * Copyright (C) 2007 Johan Engelen
+ * Copyright (C) 2006 John Bintz
+ * Copyright (C) 1999-2013 authors
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ *
+ */
+
+#include <sigc++/sigc++.h>
+#include <cstddef>
+
+class SPDocument;
+class SPObject;
+
+namespace Inkscape {
+  
+class ObjectHierarchy;
+
+namespace XML {
+    class Node;
+}
+
+/**
+ * The layer model for a document.
+ *
+ * This class represents the layer model for a document, typically (but
+ * not necessarily) displayed in an SPDesktop.
+ *
+ * It also implements its own asynchronous notification signals that
+ * UI elements can listen to.
+ */
+class LayerModel
+{
+    SPDocument *_doc;
+    Inkscape::ObjectHierarchy *_layer_hierarchy;
+    unsigned int _display_key;
+
+public:
+    /** Construct a layer model */
+    LayerModel();
+
+    /** Destructor */
+    ~LayerModel();
+
+    // Set document
+    void setDocument(SPDocument *doc);
+
+    // Set display key. For GUI apps.
+    void setDisplayKey(unsigned int display_key);
+
+    // Get the document that this layer model refers to. May be NULL.
+    SPDocument *getDocument();
+
+    // TODO look into making these return a more specific subclass:
+    SPObject *currentRoot() const;
+    SPObject *currentLayer() const;
+
+    void reset();
+    void setCurrentLayer(SPObject *object);
+    void toggleLayerSolo(SPObject *object);
+    void toggleHideAllLayers(bool hide);
+    void toggleLockAllLayers(bool lock);
+    void toggleLockOtherLayers(SPObject *object);
+    SPObject *layerForObject(SPObject *object);
+    bool isLayer(SPObject *object) const;
+    
+    sigc::signal<void, SPObject *> _layer_activated_signal;
+    sigc::signal<void, SPObject *> _layer_deactivated_signal;
+    sigc::signal<void, SPObject *, SPObject *> _layer_changed_signal;
+};
+
+} // namespace Inkscape
+
+#endif
+/*
+  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 :