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diff --git a/src/ui/view/edit-widget-interface.h b/src/ui/view/edit-widget-interface.h
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+++ b/src/ui/view/edit-widget-interface.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Authors:
+ *     Ralf Stephan <ralf@ark.in-berlin.de>
+ *     John Bintz <jcoswell@coswellproductions.org>
+ *
+ * Copyright (C) 2006 John Bintz
+ * Copyright (C) 2005 Ralf Stephan
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef INKSCAPE_UI_VIEW_EDIT_WIDGET_IFACE_H
+#define INKSCAPE_UI_VIEW_EDIT_WIDGET_IFACE_H
+
+#include "message.h"
+#include <2geom/point.h>
+
+namespace Gtk {
+    class Toolbar;
+    class Window;
+}
+
+namespace Glib {
+class ustring;
+}
+
+namespace Inkscape { namespace UI { namespace Widget { class Dock; } } }
+
+namespace Inkscape {
+namespace UI {
+namespace View {
+
+/**
+ * Abstract base class for all EditWidget implementations.
+ */
+struct EditWidgetInterface
+{
+    EditWidgetInterface() = default;
+    virtual ~EditWidgetInterface() = default;
+
+    /// Returns pointer to window UI object as void*
+    virtual Gtk::Window *getWindow() = 0;
+
+    /// Set the widget's title
+    virtual void setTitle (gchar const*) = 0;
+
+    /// Show all parts of widget the user wants to see.
+    virtual void layout() = 0;
+
+    /// Present widget to user
+    virtual void present() = 0;
+
+    /// Returns geometry of widget
+    virtual void getGeometry (gint &x, gint &y, gint &w, gint &h) = 0;
+
+    /// Change the widget's size
+    virtual void setSize (gint w, gint h) = 0;
+
+    /// Move widget to specified position
+    virtual void setPosition (Geom::Point p) = 0;
+
+    /// Transientize widget
+    virtual void setTransient (void*, int) = 0;
+
+    /// Return mouse position in widget
+    virtual Geom::Point getPointer() = 0;
+
+    /// Make widget iconified
+    virtual void setIconified() = 0;
+
+    /// Make widget maximized on screen
+    virtual void setMaximized() = 0;
+
+    /// Make widget fill screen and show it if possible.
+    virtual void setFullscreen() = 0;
+
+    /// Shuts down the desktop object for the view being closed.  It checks
+    /// to see if the document has been edited, and if so prompts the user
+    /// to save, discard, or cancel.  Returns TRUE if the shutdown operation
+    /// is cancelled or if the save is cancelled or fails, FALSE otherwise.
+    virtual bool shutdown() = 0;
+
+    /// Destroy and delete widget.
+    virtual void destroy() = 0;
+
+
+    /// Store window position to prefs
+    virtual void storeDesktopPosition() = 0;
+
+    /// Queue a redraw request with the canvas
+    virtual void requestCanvasUpdate() = 0;
+
+    /// Force a redraw of the canvas
+    virtual void requestCanvasUpdateAndWait() = 0;
+
+    /// Enable interaction on this desktop
+    virtual void enableInteraction() = 0;
+
+    /// Disable interaction on this desktop
+    virtual void disableInteraction() = 0;
+
+    /// Update the "active desktop" indicator
+    virtual void activateDesktop() = 0;
+
+    /// Update the "inactive desktop" indicator
+    virtual void deactivateDesktop() = 0;
+
+    /// Update rulers from current values
+    virtual void updateRulers() = 0;
+
+    /// Update scrollbars from current values
+    virtual void updateScrollbars (double scale) = 0;
+
+    /// Toggle rulers on/off and set preference value accordingly
+    virtual void toggleRulers() = 0;
+
+    /// Toggle scrollbars on/off and set preference value accordingly
+    virtual void toggleScrollbars() = 0;
+
+    /// Toggle CMS on/off and set preference value accordingly
+    virtual void toggleColorProfAdjust() = 0;
+
+    /// Is CMS on/off
+    virtual bool colorProfAdjustEnabled() = 0;
+
+    /// Temporarily block signals and update zoom display
+    virtual void updateZoom() = 0;
+
+    /// The zoom display will get the keyboard focus.
+    virtual void letZoomGrabFocus() = 0;
+
+    /// Temporarily block signals and update rotation display
+    virtual void updateRotation() = 0;
+
+    virtual Gtk::Toolbar* get_toolbar_by_name(const Glib::ustring&) = 0;
+
+    /// In auxiliary toolbox, set focus to widget having specific id
+    virtual void setToolboxFocusTo (const gchar *) = 0;
+
+    /// In auxiliary toolbox, set value of adjustment with specific id
+    virtual void setToolboxAdjustmentValue (const gchar *, double) = 0;
+
+    /// In auxiliary toolbox, return true if specific togglebutton is active
+    virtual bool isToolboxButtonActive (gchar const*) = 0;
+
+    /// Set the coordinate display
+    virtual void setCoordinateStatus (Geom::Point p) = 0;
+
+    /// Message widget will get no content
+    virtual void setMessage (Inkscape::MessageType type, gchar const* msg) = 0;
+
+
+    /** Show an info dialog with the given message */
+    virtual bool showInfoDialog( Glib::ustring const &message ) = 0;
+
+    /// Open yes/no dialog with warning text and confirmation question.
+    virtual bool warnDialog (Glib::ustring const &) = 0;
+
+    virtual Inkscape::UI::Widget::Dock* getDock () = 0;
+};
+
+} // namespace View
+} // namespace UI
+} // namespace Inkscape
+
+#endif // INKSCAPE_UI_VIEW_EDIT_WIDGET_IFACE_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 :