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diff --git a/src/ui/dialog/svg-preview.h b/src/ui/dialog/svg-preview.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief Implementation of the file dialog interfaces defined in filedialogimpl.h
+ */
+/* Authors:
+ *   Bob Jamison
+ *   Johan Engelen <johan@shouraizou.nl>
+ *   Joel Holdsworth
+ *   Bruno Dilly
+ *   Other dudes from The Inkscape Organization
+ *
+ * Copyright (C) 2004-2008 Authors
+ * Copyright (C) 2004-2007 The Inkscape Organization
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef __SVG_PREVIEW_H__
+#define __SVG_PREVIEW_H__
+
+//Gtk includes
+#include <gtkmm.h>
+
+//General includes
+#include <unistd.h>
+#include <sys/stat.h>
+#include <cerrno>
+
+#include "filedialog.h"
+
+
+namespace Gtk {
+class Expander;
+}
+
+namespace Inkscape {
+  class URI;
+
+namespace UI {
+
+namespace View {
+  class SVGViewWidget;
+}
+
+namespace Dialog {
+
+/*#########################################################################
+### SVG Preview Widget
+#########################################################################*/
+
+/**
+ * Simple class for displaying an SVG file in the "preview widget."
+ * Currently, this is just a wrapper of the sp_svg_view Gtk widget.
+ * Hopefully we will eventually replace with a pure Gtkmm widget.
+ */
+class SVGPreview : public Gtk::Box
+{
+public:
+
+    SVGPreview();
+
+    ~SVGPreview() override;
+
+    bool setDocument(SPDocument *doc);
+
+    bool setFileName(Glib::ustring &fileName);
+
+    bool setFromMem(char const *xmlBuffer);
+
+    bool set(Glib::ustring &fileName, int dialogType);
+
+    bool setURI(URI &uri);
+
+    /**
+     * Show image embedded in SVG
+     */
+    void showImage(Glib::ustring &fileName);
+
+    /**
+     * Show the "No preview" image
+     */
+    void showNoPreview();
+
+    /**
+     * Show the "Too large" image
+     */
+    void showTooLarge(long fileLength);
+
+private:
+    /**
+     * The svg document we are currently showing
+     */
+    SPDocument *document;
+
+    /**
+     * The sp_svg_view widget
+     */
+    Inkscape::UI::View::SVGViewWidget *viewer;
+
+    /**
+     * are we currently showing the "no preview" image?
+     */
+    bool showingNoPreview;
+
+};
+
+
+} // namespace Dialog
+} // namespace UI
+} // namespace Inkscape
+
+#endif /*__SVG_PREVIEW_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 :