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diff --git a/src/ui/dialog/attrdialog.h b/src/ui/dialog/attrdialog.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief A dialog for XML attributes based on Gtk TreeView
+ */
+/* Authors:
+ *   Martin Owens
+ *
+ * Copyright (C) Martin Owens 2018 <doctormo@gmail.com>
+ *
+ * Released under GNU GPLv2 or later, read the file 'COPYING' for more information
+ */
+
+#ifndef SEEN_UI_DIALOGS_ATTRDIALOG_H
+#define SEEN_UI_DIALOGS_ATTRDIALOG_H
+
+#include <gtkmm/dialog.h>
+#include <gtkmm/liststore.h>
+#include <gtkmm/popover.h>
+#include <gtkmm/scrolledwindow.h>
+#include <gtkmm/textview.h>
+#include <gtkmm/treeview.h>
+
+#include "desktop.h"
+#include "message.h"
+#include "ui/dialog/dialog-base.h"
+
+#define ATTR_DIALOG(obj) (dynamic_cast<Inkscape::UI::Dialog::AttrDialog*>((Inkscape::UI::Dialog::AttrDialog*)obj))
+
+namespace Inkscape {
+class MessageStack;
+class MessageContext;
+namespace UI {
+namespace Dialog {
+
+/**
+ * @brief The AttrDialog class
+ * This dialog allows to add, delete and modify XML attributes created in the
+ * xml editor.
+ */
+class AttrDialog : public DialogBase
+{
+public:
+    AttrDialog();
+    ~AttrDialog() override;
+
+    static AttrDialog &getInstance() { return *new AttrDialog(); }
+
+    // Data structure
+    class AttrColumns : public Gtk::TreeModel::ColumnRecord {
+    public:
+        AttrColumns() {
+	  add(_attributeName);
+	  add(_attributeValue);
+      add(_attributeValueRender);
+        }
+        Gtk::TreeModelColumn<Glib::ustring> _attributeName;
+        Gtk::TreeModelColumn<Glib::ustring> _attributeValue;
+        Gtk::TreeModelColumn<Glib::ustring> _attributeValueRender;
+    };
+    AttrColumns _attrColumns;
+
+    // TreeView
+    Gtk::TreeView _treeView;
+    Glib::RefPtr<Gtk::ListStore> _store;
+    Gtk::CellRendererText *_nameRenderer;
+    Gtk::CellRendererText *_valueRenderer;
+    Gtk::TreeViewColumn *_nameCol;
+    Gtk::TreeViewColumn *_valueCol;
+    Gtk::TreeModel::Path _modelpath;
+    Gtk::Popover *_popover;
+    Gtk::TextView *_textview;
+    Glib::ustring valuepath;
+    Glib::ustring valueediting;
+
+    // Text/comment nodes
+    Gtk::TextView *_content_tv;
+    Gtk::ScrolledWindow *_content_sw;
+
+    /**
+     * Status bar
+     */
+    std::shared_ptr<Inkscape::MessageStack> _message_stack;
+    std::unique_ptr<Inkscape::MessageContext> _message_context;
+
+    // Widgets
+    Gtk::Box _mainBox;
+    Gtk::ScrolledWindow _scrolledWindow;
+    Gtk::ScrolledWindow _scrolled_text_view;
+    Gtk::Button _buttonAddAttribute;
+    // Variables - Inkscape
+    Inkscape::XML::Node* _repr;
+    Gtk::Box status_box;
+    Gtk::Label status;
+    bool _updating;
+
+    // Helper functions
+    void setRepr(Inkscape::XML::Node * repr);
+    void setUndo(Glib::ustring const &event_description);
+    /**
+     * Sets the XML status bar, depending on which attr is selected.
+     */
+    void attr_reset_context(gint attr);
+    static void _set_status_message(Inkscape::MessageType type, const gchar *message, GtkWidget *dialog);
+
+    /**
+     * Signal handlers
+     */
+    sigc::connection _message_changed_connection;
+    void onAttrChanged(Inkscape::XML::Node *repr, const gchar * name, const gchar * new_value);
+    bool onNameKeyPressed(GdkEventKey *event, Gtk::Entry *entry);
+    bool onValueKeyPressed(GdkEventKey *event, Gtk::Entry *entry);
+    void onAttrDelete(Glib::ustring path);
+    bool onAttrCreate(GdkEventButton *event);
+    bool onKeyPressed(GdkEventKey *event);
+    void popClosed();
+    void startNameEdit(Gtk::CellEditable *cell, const Glib::ustring &path);
+    void startValueEdit(Gtk::CellEditable *cell, const Glib::ustring &path);
+    void nameEdited(const Glib::ustring &path, const Glib::ustring &name);
+    void valueEdited(const Glib::ustring &path, const Glib::ustring &value);
+    void textViewMap();
+    void valueCanceledPop();
+    void valueEditedPop();
+};
+
+
+} // namespace Dialog
+} // namespace UI
+} // namespace Inkscape
+
+#endif // ATTRDIALOG_H