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diff --git a/src/ui/clipboard.h b/src/ui/clipboard.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief System-wide clipboard management - class declaration
+ *//*
+ * Authors: see git history
+ *   Krzysztof Kosiński <tweenk@o2.pl>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_INKSCAPE_CLIPBOARD_H
+#define SEEN_INKSCAPE_CLIPBOARD_H
+
+#include <glibmm/ustring.h>
+#include <vector>
+
+// forward declarations
+class SPDesktop;
+class SPDocument;
+namespace Inkscape {
+class ObjectSet;
+namespace XML { class Node; }
+namespace LivePathEffect { class PathParam; }
+
+namespace UI {
+
+/**
+ * @brief System-wide clipboard manager
+ *
+ * ClipboardManager takes care of manipulating the system clipboard in response
+ * to user actions. It holds a complete SPDocument as the contents. This document
+ * is exported using output extensions when other applications request data.
+ * Copying to another instance of Inkscape is special-cased, because of the extra
+ * data required (i.e. style, size, Live Path Effects parameters, etc.)
+ */
+
+class ClipboardManager {
+public:
+    virtual void copy(ObjectSet *set) = 0;
+    virtual void copyPathParameter(Inkscape::LivePathEffect::PathParam *) = 0;
+    virtual void copySymbol(Inkscape::XML::Node* symbol, gchar const* style, SPDocument *source) = 0;
+    virtual bool paste(SPDesktop *desktop, bool in_place = false) = 0;
+    virtual bool pasteStyle(ObjectSet *set) = 0;
+    virtual bool pasteSize(ObjectSet *set, bool separately, bool apply_x, bool apply_y) = 0;
+    virtual bool pastePathEffect(ObjectSet *set) = 0;
+    virtual Glib::ustring getPathParameter(SPDesktop* desktop) = 0;
+    virtual Glib::ustring getShapeOrTextObjectId(SPDesktop *desktop) = 0;
+    virtual std::vector<Glib::ustring> getElementsOfType(SPDesktop *desktop, gchar const* type = "*", gint maxdepth = -1) = 0;
+    virtual Glib::ustring getFirstObjectID() = 0;
+    static ClipboardManager *get();
+protected:
+    ClipboardManager(); // singleton
+    virtual ~ClipboardManager();
+private:
+    ClipboardManager(const ClipboardManager &) = delete; ///< no copy
+    ClipboardManager &operator=(const ClipboardManager &) = delete; ///< no assign
+
+    static ClipboardManager *_instance;
+};
+
+} // namespace IO
+} // 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 :