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diff --git a/src/extension/effect.h b/src/extension/effect.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Authors:
+ * Ted Gould <ted@gould.cx>
+ *
+ * Copyright (C) 2002-2004 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+
+#ifndef INKSCAPE_EXTENSION_EFFECT_H__
+#define INKSCAPE_EXTENSION_EFFECT_H__
+
+#include <list>
+
+#include <glibmm/i18n.h>
+#include "extension.h"
+#include "inkscape-application.h"
+
+namespace Gtk {
+ class Box;
+}
+
+class SPDocument;
+
+namespace Inkscape {
+
+
+namespace Extension {
+class PrefDialog;
+
+/** \brief Effects are extensions that take a document and do something
+ to it in place. This class adds the extra functions required
+ to make extensions effects.
+*/
+class Effect : public Extension {
+ /** \brief This is the last effect that was used. This is used in
+ a menu item to rapidly recall the same effect. */
+ static Effect * _last_effect;
+
+ Inkscape::XML::Node *find_menu (Inkscape::XML::Node * menustruct, const gchar *name);
+ void get_menu (Inkscape::XML::Node * pattern, std::list<Glib::ustring>& sub_menu_list);
+
+ /** \brief Menu node created for this effect */
+ Inkscape::XML::Node * _menu_node;
+
+ /** \brief The preference dialog if it is shown */
+ PrefDialog * _prefDialog;
+
+public:
+ Effect(Inkscape::XML::Node *in_repr, Implementation::Implementation *in_imp, std::string *base_directory);
+ ~Effect () override;
+
+ bool prefs (Inkscape::UI::View::View * doc);
+ void effect (Inkscape::UI::View::View * doc);
+
+ /** \brief Whether a working dialog should be shown */
+ bool _workingDialog;
+
+ /** \brief Static function to get the last effect used */
+ static Effect * get_last_effect () { return _last_effect; };
+ static void set_last_effect (Effect * in_effect);
+
+ static void place_menus ();
+ void place_menu (Inkscape::XML::Node * menus);
+
+ Gtk::Box * get_info_widget();
+
+ bool no_doc; // if true, the effect does not process SVG document at all, so no need to save, read, and watch for errors
+ bool no_live_preview; // if true, the effect does not need "live preview" checkbox in its dialog
+
+ PrefDialog *get_pref_dialog ();
+ void set_pref_dialog (PrefDialog * prefdialog);
+private:
+ static gchar * remove_ (gchar * instr);
+};
+
+} } /* namespace Inkscape, Extension */
+#endif /* INKSCAPE_EXTENSION_EFFECT_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 :