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diff --git a/src/extension/prefdialog/prefdialog.h b/src/extension/prefdialog/prefdialog.h
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+++ b/src/extension/prefdialog/prefdialog.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Authors:
+ *   Ted Gould <ted@gould.cx>
+ *
+ * Copyright (C) 2005,2007-2008 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef INKSCAPE_EXTENSION_DIALOG_H__
+#define INKSCAPE_EXTENSION_DIALOG_H__
+
+#include <gtkmm/dialog.h>
+#include <glibmm/value.h>
+#include <glibmm/ustring.h>
+
+namespace Gtk {
+class CheckButton;
+}
+
+namespace Inkscape {
+namespace Extension {
+class Effect;
+class ExecutionEnv;
+class InxParameter;
+
+/** \brief  A class to represent the preferences for an extension */
+class PrefDialog : public Gtk::Dialog {
+    /** \brief  Name of the extension */
+    Glib::ustring _name;
+
+    /** \brief  A pointer to the OK button */
+    Gtk::Button *_button_ok;
+    /** \brief  A pointer to the CANCEL button */
+    Gtk::Button *_button_cancel;
+
+    /** \brief  Button to control live preview */
+    Gtk::Widget *_button_preview;
+    /** \brief  Checkbox for the preview */
+    Gtk::CheckButton *_checkbox_preview;
+
+    /** \brief  Parameter to control live preview */
+    InxParameter *_param_preview;
+
+    /** \brief  XML to define the live effects parameter on the dialog */
+    static const char * live_param_xml;
+
+    /** \brief Signal that the user is changing the live effect state */
+    sigc::signal<void> _signal_preview;
+    /** \brief Signal that one of the parameters change */
+    sigc::signal<void> _signal_param_change;
+
+    /** \brief  If this is the preferences for an effect, the effect
+                that we're working with. */
+    Effect *_effect;
+    /** \brief  If we're executing in preview mode here is the execution
+                environment for the effect. */
+    ExecutionEnv *_exEnv;
+
+    /** \brief  The timer used to make it so that parameters don't respond
+                directly and allows for changes. */
+    sigc::connection _timersig;
+
+    void preview_toggle();
+    void param_change();
+    bool param_timer_expire();
+    void on_response (int signal) override;
+
+public:
+    PrefDialog (Glib::ustring name,
+                Gtk::Widget * controls = nullptr,
+                Effect * effect = nullptr);
+    ~PrefDialog () override;
+};
+
+
+};}; /* namespace Inkscape, Extension */
+
+#endif /* INKSCAPE_EXTENSION_DIALOG_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 :