Adding upstream version 1.0.2.upstream/1.0.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2570 insertions, 0 deletions

diff --git a/src/widgets/desktop-widget.cpp b/src/widgets/desktop-widget.cpp
new file mode 100644
index 0000000..491ce41
--- /dev/null
+++ b/src/widgets/desktop-widget.cpp
@@ -0,0 +1,2570 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** \file
+ * Desktop widget implementation
+ */
+/* Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   MenTaLguY <mental@rydia.net>
+ *   bulia byak <buliabyak@users.sf.net>
+ *   Ralf Stephan <ralf@ark.in-berlin.de>
+ *   John Bintz <jcoswell@coswellproductions.org>
+ *   Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 2007 Johan Engelen
+ * Copyright (C) 2006 John Bintz
+ * Copyright (C) 2004 MenTaLguY
+ * Copyright (C) 1999-2002 Lauris Kaplinski
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"  // only include where actually required!
+#endif
+
+#include <2geom/rect.h>
+
+#include "attributes.h"
+#include "cms-system.h"
+#include "conn-avoid-ref.h"
+#include "desktop-events.h"
+#include "desktop-widget.h"
+#include "desktop.h"
+#include "document-undo.h"
+#include "ege-color-prof-tracker.h"
+#include "file.h"
+#include "inkscape-version.h"
+#include "verbs.h"
+
+#include "display/canvas-arena.h"
+#include "display/canvas-axonomgrid.h"
+#include "display/guideline.h"
+#include "display/sp-canvas.h"
+
+#include "extension/db.h"
+
+#include "helper/action.h"
+
+#include "object/sp-image.h"
+#include "object/sp-namedview.h"
+#include "object/sp-root.h"
+
+#include "ui/dialog/dialog-manager.h"
+#include "ui/dialog/swatches.h"
+#include "ui/icon-loader.h"
+#include "ui/icon-names.h"
+#include "ui/tools/box3d-tool.h"
+#include "ui/uxmanager.h"
+#include "ui/widget/button.h"
+#include "ui/widget/dock.h"
+#include "ui/widget/ink-ruler.h"
+#include "ui/widget/layer-selector.h"
+#include "ui/widget/selected-style.h"
+#include "ui/widget/spin-button-tool-item.h"
+#include "ui/widget/unit-tracker.h"
+
+// TEMP
+#include "ui/desktop/menubar.h"
+
+#include "util/ege-appear-time-tracker.h"
+#include "util/units.h"
+
+// We're in the "widgets" directory, so no need to explicitly prefix these:
+#include "spinbutton-events.h"
+#include "spw-utilities.h"
+#include "toolbox.h"
+#include "widget-sizes.h"
+
+#ifdef GDK_WINDOWING_QUARTZ
+#include <gtkosxapplication.h>
+#endif
+
+using Inkscape::DocumentUndo;
+using Inkscape::UI::Widget::UnitTracker;
+using Inkscape::UI::UXManager;
+using Inkscape::UI::ToolboxFactory;
+using ege::AppearTimeTracker;
+using Inkscape::Util::unit_table;
+
+
+//---------------------------------------------------------------------
+/* SPDesktopWidget */
+
+static void sp_desktop_widget_class_init (SPDesktopWidgetClass *klass);
+
+static void sp_desktop_widget_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
+static void sp_desktop_widget_realize (GtkWidget *widget);
+
+static void sp_desktop_widget_adjustment_value_changed (GtkAdjustment *adj, SPDesktopWidget *dtw);
+
+static gdouble sp_dtw_zoom_value_to_display (gdouble value);
+static gdouble sp_dtw_zoom_display_to_value (gdouble value);
+static void sp_dtw_zoom_menu_handler (SPDesktop *dt, gdouble factor);
+
+SPViewWidgetClass *dtw_parent_class;
+
+class CMSPrefWatcher {
+public:
+    CMSPrefWatcher() :
+        _dpw(*this),
+        _spw(*this),
+        _tracker(ege_color_prof_tracker_new(nullptr))
+    {
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        g_signal_connect( G_OBJECT(_tracker), "modified", G_CALLBACK(hook), this );
+        prefs->addObserver(_dpw);
+        prefs->addObserver(_spw);
+    }
+    virtual ~CMSPrefWatcher() = default;
+
+    //virtual void notify(PrefValue &);
+    void add( SPDesktopWidget* dtw ) {
+        _widget_list.push_back(dtw);
+    }
+    void remove( SPDesktopWidget* dtw ) {
+        _widget_list.remove(dtw);
+    }
+
+private:
+    static void hook(EgeColorProfTracker *tracker, gint b, CMSPrefWatcher *watcher);
+
+    class DisplayProfileWatcher : public Inkscape::Preferences::Observer {
+    public:
+        DisplayProfileWatcher(CMSPrefWatcher &pw) : Observer("/options/displayprofile"), _pw(pw) {}
+        void notify(Inkscape::Preferences::Entry const &/*val*/) override {
+            Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+            _pw._setCmsSensitive(!prefs->getString("/options/displayprofile/uri").empty());
+            _pw._refreshAll();
+        }
+    private:
+        CMSPrefWatcher &_pw;
+    };
+
+    DisplayProfileWatcher _dpw;
+
+    class SoftProofWatcher : public Inkscape::Preferences::Observer {
+    public:
+        SoftProofWatcher(CMSPrefWatcher &pw) : Observer("/options/softproof"), _pw(pw) {}
+        void notify(Inkscape::Preferences::Entry const &) override {
+            _pw._refreshAll();
+        }
+    private:
+        CMSPrefWatcher &_pw;
+    };
+
+    SoftProofWatcher _spw;
+
+    void _refreshAll();
+    void _setCmsSensitive(bool value);
+
+    std::list<SPDesktopWidget*> _widget_list;
+    EgeColorProfTracker *_tracker;
+
+    friend class DisplayProfileWatcher;
+    friend class SoftproofWatcher;
+};
+
+#if defined(HAVE_LIBLCMS2)
+void CMSPrefWatcher::hook(EgeColorProfTracker * /*tracker*/, gint monitor, CMSPrefWatcher * /*watcher*/)
+{
+    unsigned char* buf = nullptr;
+    guint len = 0;
+
+    ege_color_prof_tracker_get_profile_for( monitor, reinterpret_cast<gpointer*>(&buf), &len );
+    Glib::ustring id = Inkscape::CMSSystem::setDisplayPer( buf, len, monitor );
+}
+#else
+void CMSPrefWatcher::hook(EgeColorProfTracker * /*tracker*/, gint /*monitor*/, CMSPrefWatcher * /*watcher*/)
+{
+}
+#endif // defined(HAVE_LIBLCMS2)
+
+/// @todo Use conditional compilation in saner places. The whole PrefWatcher
+/// object is unnecessary if defined(HAVE_LIBLCMS2) is not defined.
+void CMSPrefWatcher::_refreshAll()
+{
+#if defined(HAVE_LIBLCMS2)
+    for (auto & it : _widget_list) {
+        it->requestCanvasUpdate();
+    }
+#endif // defined(HAVE_LIBLCMS2)
+}
+
+void CMSPrefWatcher::_setCmsSensitive(bool enabled)
+{
+#if defined(HAVE_LIBLCMS2)
+    for ( auto dtw : _widget_list ) {
+        auto cms_adj = dtw->get_cms_adjust();
+        if ( cms_adj->get_sensitive() != enabled ) {
+            dtw->cms_adjust_set_sensitive(enabled);
+        }
+    }
+#else
+    (void) enabled;
+#endif // defined(HAVE_LIBLCMS2)
+}
+
+static CMSPrefWatcher* watcher = nullptr;
+
+void
+SPDesktopWidget::setMessage (Inkscape::MessageType type, const gchar *message)
+{
+    _select_status->set_markup(message ? message : "");
+
+    // make sure the important messages are displayed immediately!
+    if (type == Inkscape::IMMEDIATE_MESSAGE && _select_status->get_is_drawable()) {
+        _select_status->queue_draw();
+    }
+
+    _select_status->set_tooltip_text(_select_status->get_text());
+}
+
+Geom::Point
+SPDesktopWidget::window_get_pointer()
+{
+    int x, y;
+    auto window = Glib::wrap(GTK_WIDGET(_canvas))->get_window();
+    auto display = window->get_display();
+    auto seat = display->get_default_seat();
+    auto device = seat->get_pointer();
+    Gdk::ModifierType m;
+    window->get_device_position(device, x, y, m);
+
+    return Geom::Point(x, y);
+}
+
+static GTimer *overallTimer = nullptr;
+
+/**
+ * Registers SPDesktopWidget class and returns its type number.
+ */
+GType SPDesktopWidget::getType()
+{
+    static GType type = 0;
+    if (!type) {
+        GTypeInfo info = {
+            sizeof(SPDesktopWidgetClass),
+            nullptr, // base_init
+            nullptr, // base_finalize
+            (GClassInitFunc)sp_desktop_widget_class_init,
+            nullptr, // class_finalize
+            nullptr, // class_data
+            sizeof(SPDesktopWidget),
+            0, // n_preallocs
+            (GInstanceInitFunc)SPDesktopWidget::init,
+            nullptr // value_table
+        };
+        type = g_type_register_static(SP_TYPE_VIEW_WIDGET, "SPDesktopWidget", &info, static_cast<GTypeFlags>(0));
+        // Begin a timer to watch for the first desktop to appear on-screen
+        overallTimer = g_timer_new();
+    }
+    return type;
+}
+
+/**
+ * SPDesktopWidget vtable initialization
+ */
+static void
+sp_desktop_widget_class_init (SPDesktopWidgetClass *klass)
+{
+    dtw_parent_class = SP_VIEW_WIDGET_CLASS(g_type_class_peek_parent(klass));
+
+    GObjectClass *object_class = G_OBJECT_CLASS(klass);
+    GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
+
+    object_class->dispose = SPDesktopWidget::dispose;
+
+    widget_class->size_allocate = sp_desktop_widget_size_allocate;
+    widget_class->realize = sp_desktop_widget_realize;
+}
+
+/**
+ * Callback for changes in size of the canvas table (i.e. the container for
+ * the canvas, the rulers etc).
+ *
+ * This adjusts the range of the rulers when the dock container is adjusted
+ * (fixes lp:950552)
+ *
+ * This fix was causing the rulers to be completely redrawn when not needed.
+ * Added check to see if allocation really changed.
+ *
+ *(Question, why is the callback being called when allocation not changed?)
+ */
+void
+SPDesktopWidget::canvas_tbl_size_allocate(Gtk::Allocation& allocation)
+{
+    if (_allocation == allocation) {
+        return;
+    }
+
+    _allocation = allocation;
+    update_rulers();
+}
+
+/**
+ * Callback for SPDesktopWidget object initialization.
+ */
+void SPDesktopWidget::init( SPDesktopWidget *dtw )
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+    new (&dtw->modified_connection) sigc::connection();
+
+    dtw->_ruler_clicked = false;
+    dtw->_ruler_dragged = false;
+    dtw->_active_guide = nullptr;
+    dtw->_xp = 0;
+    dtw->_yp = 0;
+    dtw->window = nullptr;
+    dtw->desktop = nullptr;
+    dtw->_interaction_disabled_counter = 0;
+
+    /* Main table */
+    dtw->_vbox = Gtk::manage(new Gtk::Box(Gtk::ORIENTATION_VERTICAL));
+    dtw->_vbox->set_name("DesktopMainTable");
+    gtk_container_add( GTK_CONTAINER(dtw), GTK_WIDGET(dtw->_vbox->gobj()) );
+
+    /* Status bar */
+    dtw->_statusbar = Gtk::manage(new Gtk::Box());
+    dtw->_statusbar->set_name("DesktopStatusBar");
+    dtw->_vbox->pack_end(*dtw->_statusbar, false, true);
+
+    /* Swatches panel */
+    {
+        dtw->_panels = new Inkscape::UI::Dialog::SwatchesPanel("/embedded/swatches");
+        dtw->_panels->set_vexpand(false);
+        dtw->_vbox->pack_end(*dtw->_panels, false, true);
+    }
+
+    /* DesktopHBox (Vertical toolboxes, canvas) */
+    dtw->_hbox = Gtk::manage(new Gtk::Box());
+    dtw->_hbox->set_name("DesktopHbox");
+    dtw->_vbox->pack_end(*dtw->_hbox, true, true);
+
+    /* Toolboxes */
+    dtw->aux_toolbox = ToolboxFactory::createAuxToolbox();
+    dtw->_vbox->pack_end(*Glib::wrap(dtw->aux_toolbox), false, true);
+
+    dtw->snap_toolbox = ToolboxFactory::createSnapToolbox();
+    ToolboxFactory::setOrientation( dtw->snap_toolbox, GTK_ORIENTATION_VERTICAL );
+    dtw->_hbox->pack_end(*Glib::wrap(dtw->snap_toolbox), false, true);
+
+    dtw->commands_toolbox = ToolboxFactory::createCommandsToolbox();
+    dtw->_vbox->pack_end(*Glib::wrap(dtw->commands_toolbox), false, true);
+
+    dtw->tool_toolbox = ToolboxFactory::createToolToolbox();
+    ToolboxFactory::setOrientation( dtw->tool_toolbox, GTK_ORIENTATION_VERTICAL );
+    dtw->_hbox->pack_start(*Glib::wrap(dtw->tool_toolbox), false, true);
+
+    /* Canvas table wrapper */
+    auto tbl_wrapper = Gtk::manage(new Gtk::Grid()); // Is this widget really needed? No!
+    tbl_wrapper->set_name("CanvasTableWrapper");
+    dtw->_hbox->pack_start(*tbl_wrapper, true, true, 1);
+
+    /* Canvas table */
+    dtw->_canvas_tbl = Gtk::manage(new Gtk::Grid());
+    dtw->_canvas_tbl->set_name("CanvasTable");
+    // Added to table wrapper later either directly or via paned window shared with dock.
+
+
+
+    // Lock guides button
+    dtw->_guides_lock = Gtk::manage(new Inkscape::UI::Widget::Button(GTK_ICON_SIZE_MENU,
+                                                                     Inkscape::UI::Widget::BUTTON_TYPE_TOGGLE,
+                                                                     nullptr,
+                                                                     INKSCAPE_ICON("object-locked"),
+                                                                     _("Toggle lock of all guides in the document")));
+
+    auto guides_lock_style_provider = Gtk::CssProvider::create();
+    guides_lock_style_provider->load_from_data("GtkWidget { padding-left: 0; padding-right: 0; padding-top: 0; padding-bottom: 0; }");
+    dtw->_guides_lock->set_name("LockGuides");
+    auto context = dtw->_guides_lock->get_style_context();
+    context->add_provider(guides_lock_style_provider, GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+    dtw->_guides_lock->signal_toggled().connect(sigc::mem_fun(dtw, &SPDesktopWidget::update_guides_lock));
+    dtw->_canvas_tbl->attach(*dtw->_guides_lock, 0, 0, 1, 1);
+
+    /* Rulers */
+    Inkscape::Util::Unit const *pt = unit_table.getUnit("pt");
+
+    /* Horizontal ruler */
+    dtw->_hruler = Gtk::manage(new Inkscape::UI::Widget::Ruler(Gtk::ORIENTATION_HORIZONTAL));
+    dtw->_hruler->set_unit(pt);
+
+    // We should probably get rid of this and attach the signals directly rulers.
+    dtw->_hruler_box = Gtk::manage(new Gtk::EventBox());
+    dtw->_hruler_box->set_tooltip_text(gettext(pt->name_plural.c_str()));
+    dtw->_hruler_box->add(*dtw->_hruler);
+    dtw->_hruler_box->signal_button_press_event().connect(sigc::bind(sigc::mem_fun(*dtw, &SPDesktopWidget::on_ruler_box_button_press_event), dtw->_hruler_box, true));
+    dtw->_hruler_box->signal_button_release_event().connect(sigc::bind(sigc::mem_fun(*dtw, &SPDesktopWidget::on_ruler_box_button_release_event), dtw->_hruler_box, true));
+    dtw->_hruler_box->signal_motion_notify_event().connect(sigc::bind(sigc::mem_fun(*dtw, &SPDesktopWidget::on_ruler_box_motion_notify_event), dtw->_hruler_box, true));
+
+    dtw->_canvas_tbl->attach(*dtw->_hruler_box, 1, 0, 1, 1);
+
+    /* Vertical ruler */
+    dtw->_vruler = Gtk::manage(new Inkscape::UI::Widget::Ruler(Gtk::ORIENTATION_VERTICAL));
+    dtw->_vruler->set_unit(pt);
+
+    dtw->_vruler_box = Gtk::manage(new Gtk::EventBox());
+    dtw->_vruler_box->set_tooltip_text(gettext(pt->name_plural.c_str()));
+    dtw->_vruler_box->add(*dtw->_vruler);
+    dtw->_vruler_box->signal_button_press_event().connect(sigc::bind(sigc::mem_fun(*dtw, &SPDesktopWidget::on_ruler_box_button_press_event), dtw->_vruler_box, false));
+    dtw->_vruler_box->signal_button_release_event().connect(sigc::bind(sigc::mem_fun(*dtw, &SPDesktopWidget::on_ruler_box_button_release_event), dtw->_vruler_box, false));
+    dtw->_vruler_box->signal_motion_notify_event().connect(sigc::bind(sigc::mem_fun(*dtw, &SPDesktopWidget::on_ruler_box_motion_notify_event), dtw->_vruler_box, false));
+
+    dtw->_canvas_tbl->attach(*dtw->_vruler_box, 0, 1, 1, 1);
+
+    // Horizontal scrollbar
+    dtw->_hadj = Gtk::Adjustment::create(0.0, -4000.0, 4000.0, 10.0, 100.0, 4.0);
+    dtw->_hscrollbar = Gtk::manage(new Gtk::Scrollbar(dtw->_hadj));
+    dtw->_hscrollbar->set_name("HorizontalScrollbar");
+    dtw->_canvas_tbl->attach(*dtw->_hscrollbar, 1, 2, 1, 1);
+
+    // By packing the sticky zoom button and vertical scrollbar in a box it allows the canvas to
+    // expand fully to the top if the rulers are hidden.
+    // (Otherwise, the canvas is pushed down by the height of the sticky zoom button.)
+
+    // Vertical Scrollbar box
+    dtw->_vscrollbar_box = Gtk::manage(new Gtk::Box(Gtk::ORIENTATION_VERTICAL));
+    dtw->_canvas_tbl->attach(*dtw->_vscrollbar_box, 2, 0, 1, 2);
+
+    // Sticky zoom button
+    dtw->_sticky_zoom = Gtk::manage(new Inkscape::UI::Widget::Button(GTK_ICON_SIZE_MENU,
+                                                                     Inkscape::UI::Widget::BUTTON_TYPE_TOGGLE,
+                                                                     nullptr,
+                                                                     INKSCAPE_ICON("zoom-original"),
+                                                                     _("Zoom drawing if window size changes")));
+    dtw->_sticky_zoom->set_name("StickyZoom");
+    dtw->_sticky_zoom->set_active(prefs->getBool("/options/stickyzoom/value"));
+    dtw->_sticky_zoom->signal_toggled().connect(sigc::mem_fun(dtw, &SPDesktopWidget::sticky_zoom_toggled));
+    dtw->_vscrollbar_box->pack_start(*dtw->_sticky_zoom, false, false);
+
+    // Vertical scrollbar
+    dtw->_vadj = Gtk::Adjustment::create(0.0, -4000.0, 4000.0, 10.0, 100.0, 4.0);
+    dtw->_vscrollbar = Gtk::manage(new Gtk::Scrollbar(dtw->_vadj, Gtk::ORIENTATION_VERTICAL));
+    dtw->_vscrollbar->set_name("VerticalScrollbar");
+    dtw->_vscrollbar_box->pack_start(*dtw->_vscrollbar, true, true, 0);
+
+    gchar const* tip = "";
+    Inkscape::Verb* verb = Inkscape::Verb::get( SP_VERB_VIEW_CMS_TOGGLE );
+    if ( verb ) {
+        SPAction *act = verb->get_action( Inkscape::ActionContext( dtw->viewwidget.view ) );
+        if ( act && act->tip ) {
+            tip = act->tip;
+        }
+    }
+    dtw->_cms_adjust = Gtk::manage(new Inkscape::UI::Widget::Button(GTK_ICON_SIZE_MENU,
+                                                                    Inkscape::UI::Widget::BUTTON_TYPE_TOGGLE,
+                                                                    nullptr,
+                                                                    INKSCAPE_ICON("color-management"),
+                                                                    tip ));
+    dtw->_cms_adjust->set_name("CMS_Adjust");
+
+#if defined(HAVE_LIBLCMS2)
+    {
+        Glib::ustring current = prefs->getString("/options/displayprofile/uri");
+        bool enabled = current.length() > 0;
+        dtw->cms_adjust_set_sensitive(enabled );
+        if ( enabled ) {
+            bool active = prefs->getBool("/options/displayprofile/enable");
+            if ( active ) {
+                dtw->_cms_adjust->toggle_set_down(true);
+            }
+        }
+    }
+    g_signal_connect_after( G_OBJECT(dtw->_cms_adjust->gobj()), "clicked", G_CALLBACK(SPDesktopWidget::cms_adjust_toggled), dtw );
+#else
+    dtw->cms_adjust_set_sensitive(false);
+#endif // defined(HAVE_LIBLCMS2)
+
+    dtw->_canvas_tbl->attach(*dtw->_cms_adjust, 2, 2, 1, 1);
+    {
+        if (!watcher) {
+            watcher = new CMSPrefWatcher();
+        }
+        watcher->add(dtw);
+    }
+    /* Canvas */
+    dtw->_canvas = SP_CANVAS(SPCanvas::createAA());
+#if defined(HAVE_LIBLCMS2)
+    dtw->_canvas->_enable_cms_display_adj = prefs->getBool("/options/displayprofile/enable");
+#endif // defined(HAVE_LIBLCMS2)
+    gtk_widget_set_can_focus (GTK_WIDGET (dtw->_canvas), TRUE);
+
+    dtw->_hruler->add_track_widget(*Glib::wrap(GTK_WIDGET(dtw->_canvas)));
+    dtw->_vruler->add_track_widget(*Glib::wrap(GTK_WIDGET(dtw->_canvas)));
+
+    auto css_provider  = gtk_css_provider_new();
+    auto style_context = gtk_widget_get_style_context(GTK_WIDGET(dtw->_canvas));
+
+    gtk_css_provider_load_from_data(css_provider,
+                                    "SPCanvas {\n"
+                                    " background-color: white;\n"
+                                    "}\n",
+                                    -1, nullptr);
+
+    gtk_style_context_add_provider(style_context,
+                                   GTK_STYLE_PROVIDER(css_provider),
+                                   GTK_STYLE_PROVIDER_PRIORITY_USER);
+    g_signal_connect(G_OBJECT(dtw->_canvas), "event", G_CALLBACK(SPDesktopWidget::event), dtw);
+
+    gtk_widget_set_hexpand(GTK_WIDGET(dtw->_canvas), TRUE);
+    gtk_widget_set_vexpand(GTK_WIDGET(dtw->_canvas), TRUE);
+    dtw->_canvas_tbl->attach(*Glib::wrap(GTK_WIDGET(dtw->_canvas)), 1, 1, 1, 1);
+
+    /* Dock */
+    bool create_dock =
+        prefs->getIntLimited("/options/dialogtype/value", Inkscape::UI::Dialog::FLOATING, 0, 1) ==
+        Inkscape::UI::Dialog::DOCK;
+
+    if (create_dock) {
+        dtw->_dock = new Inkscape::UI::Widget::Dock();
+        auto paned = new Gtk::Paned();
+        paned->set_name("Canvas_and_Dock");
+
+        paned->pack1(*dtw->_canvas_tbl);
+        paned->pack2(dtw->_dock->getWidget(), Gtk::FILL);
+
+        /* Prevent the paned from catching F6 and F8 by unsetting the default callbacks */
+        if (GtkPanedClass *paned_class = GTK_PANED_CLASS (G_OBJECT_GET_CLASS (paned->gobj()))) {
+            paned_class->cycle_child_focus = nullptr;
+            paned_class->cycle_handle_focus = nullptr;
+        }
+
+        paned->set_hexpand(true);
+        paned->set_vexpand(true);
+        tbl_wrapper->attach(*paned, 1, 1, 1, 1);
+    } else {
+        dtw->_canvas_tbl->set_hexpand(true);
+        dtw->_canvas_tbl->set_vexpand(true);
+        tbl_wrapper->attach(*(dtw->_canvas_tbl), 1, 1, 1, 1);
+    }
+
+    // connect scrollbar signals
+    dtw->_hadj->signal_value_changed().connect(sigc::mem_fun(dtw, &SPDesktopWidget::on_adjustment_value_changed));
+    dtw->_vadj->signal_value_changed().connect(sigc::mem_fun(dtw, &SPDesktopWidget::on_adjustment_value_changed));
+
+    // --------------- Status Tool Bar ------------------//
+
+    // Selected Style (Fill/Stroke/Opacity)
+    dtw->_selected_style = new Inkscape::UI::Widget::SelectedStyle(true);
+    dtw->_statusbar->pack_start(*dtw->_selected_style, false, false);
+
+    // Separator
+    dtw->_statusbar->pack_start(*Gtk::manage(new Gtk::Separator(Gtk::ORIENTATION_VERTICAL)),
+		                false, false);
+
+    // Layer Selector
+    dtw->layer_selector = new Inkscape::UI::Widget::LayerSelector(nullptr);
+    // FIXME: need to unreference on container destruction to avoid leak
+    dtw->layer_selector->reference();
+    dtw->_statusbar->pack_start(*dtw->layer_selector, false, false, 1);
+
+    // Select Status
+    dtw->_select_status = Gtk::manage(new Gtk::Label());
+    dtw->_select_status->set_name("SelectStatus");
+    dtw->_select_status->set_ellipsize(Pango::ELLIPSIZE_END);
+    dtw->_select_status->set_line_wrap(true);
+    dtw->_select_status->set_lines(2);
+    dtw->_select_status->set_halign(Gtk::ALIGN_START);
+    dtw->_select_status->set_size_request(1, -1);
+
+    // Display the initial welcome message in the statusbar
+    dtw->_select_status->set_markup(_("<b>Welcome to Inkscape!</b> Use shape or freehand tools to create objects; use selector (arrow) to move or transform them."));
+
+    dtw->_statusbar->pack_start(*dtw->_select_status, true, true);
+
+
+    // Zoom status spinbutton ---------------
+    auto zoom_adj = Gtk::Adjustment::create(100.0, log(SP_DESKTOP_ZOOM_MIN)/log(2), log(SP_DESKTOP_ZOOM_MAX)/log(2), 0.1);
+    dtw->_zoom_status = Gtk::manage(new Gtk::SpinButton(zoom_adj));
+
+    dtw->_zoom_status->set_data("dtw", dtw->_canvas);
+    dtw->_zoom_status->set_tooltip_text(_("Zoom"));
+    dtw->_zoom_status->set_size_request(STATUS_ZOOM_WIDTH, -1);
+    dtw->_zoom_status->set_width_chars(6);
+    dtw->_zoom_status->set_numeric(false);
+    dtw->_zoom_status->set_update_policy(Gtk::UPDATE_ALWAYS);
+
+    // Callbacks
+    dtw->_zoom_status_input_connection  = dtw->_zoom_status->signal_input().connect(sigc::mem_fun(dtw, &SPDesktopWidget::zoom_input));
+    dtw->_zoom_status_output_connection = dtw->_zoom_status->signal_output().connect(sigc::mem_fun(dtw, &SPDesktopWidget::zoom_output));
+    g_signal_connect (G_OBJECT (dtw->_zoom_status->gobj()), "focus-in-event", G_CALLBACK (spinbutton_focus_in), dtw->_zoom_status->gobj());
+    g_signal_connect (G_OBJECT (dtw->_zoom_status->gobj()), "key-press-event", G_CALLBACK (spinbutton_keypress), dtw->_zoom_status->gobj());
+    dtw->_zoom_status_value_changed_connection = dtw->_zoom_status->signal_value_changed().connect(sigc::mem_fun(dtw, &SPDesktopWidget::zoom_value_changed));
+    dtw->_zoom_status_populate_popup_connection = dtw->_zoom_status->signal_populate_popup().connect(sigc::mem_fun(dtw, &SPDesktopWidget::zoom_populate_popup));
+
+    // Style
+    auto css_provider_spinbutton = Gtk::CssProvider::create();
+    css_provider_spinbutton->load_from_data("* { padding-left: 2px; padding-right: 2px; padding-top: 0px; padding-bottom: 0px;}");  // Shouldn't this be in a style sheet? Used also by rotate.
+
+    dtw->_zoom_status->set_name("ZoomStatus");
+    auto context_zoom = dtw->_zoom_status->get_style_context();
+    context_zoom->add_provider(css_provider_spinbutton, GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+
+    // Rotate status spinbutton ---------------
+    auto rotation_adj = Gtk::Adjustment::create(0, -360.0, 360.0, 1.0);
+    dtw->_rotation_status = Gtk::manage(new Gtk::SpinButton(rotation_adj));
+    dtw->_rotation_status->set_data("dtw", dtw->_canvas);
+    dtw->_rotation_status->set_tooltip_text(_("Rotation. (Also Ctrl+Shift+Scroll)"));
+    dtw->_rotation_status->set_size_request(STATUS_ROTATION_WIDTH, -1);
+    dtw->_rotation_status->set_width_chars(7);
+    dtw->_rotation_status->set_numeric(false);
+    dtw->_rotation_status->set_digits(2);
+    dtw->_rotation_status->set_increments(1.0, 15.0);
+    dtw->_rotation_status->set_update_policy(Gtk::UPDATE_ALWAYS);
+
+    // Callbacks
+    dtw->_rotation_status_input_connection  = dtw->_rotation_status->signal_input().connect(sigc::mem_fun(dtw, &SPDesktopWidget::rotation_input));
+    dtw->_rotation_status_output_connection = dtw->_rotation_status->signal_output().connect(sigc::mem_fun(dtw, &SPDesktopWidget::rotation_output));
+    g_signal_connect (G_OBJECT (dtw->_rotation_status->gobj()), "focus-in-event", G_CALLBACK (spinbutton_focus_in), dtw->_rotation_status->gobj());
+    g_signal_connect (G_OBJECT (dtw->_rotation_status->gobj()), "key-press-event", G_CALLBACK (spinbutton_keypress), dtw->_rotation_status->gobj());
+    dtw->_rotation_status_value_changed_connection = dtw->_rotation_status->signal_value_changed().connect(sigc::mem_fun(dtw, &SPDesktopWidget::rotation_value_changed));
+    dtw->_rotation_status_populate_popup_connection = dtw->_rotation_status->signal_populate_popup().connect(sigc::mem_fun(dtw, &SPDesktopWidget::rotation_populate_popup));
+
+    // Style
+    dtw->_rotation_status->set_name("RotationStatus");
+    auto context_rotation = dtw->_rotation_status->get_style_context();
+    context_rotation->add_provider(css_provider_spinbutton, GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+
+
+    // Cursor coordinates
+    dtw->_coord_status = Gtk::manage(new Gtk::Grid());
+    dtw->_coord_status->set_name("CoordinateAndZStatus");
+    dtw->_coord_status->set_row_spacing(0);
+    dtw->_coord_status->set_column_spacing(10);
+    dtw->_coord_status->set_margin_end(10);
+    auto sep = Gtk::manage(new Gtk::Separator(Gtk::ORIENTATION_VERTICAL));
+    sep->set_name("CoordinateSeparator");
+    dtw->_coord_status->attach(*sep, 0, 0, 1, 2);
+
+    dtw->_coord_status->set_tooltip_text(_("Cursor coordinates"));
+    auto label_x = Gtk::manage(new Gtk::Label(_("X:")));
+    auto label_y = Gtk::manage(new Gtk::Label(_("Y:")));
+    label_x->set_halign(Gtk::ALIGN_START);
+    label_y->set_halign(Gtk::ALIGN_START);
+    dtw->_coord_status->attach(*label_x, 1, 0, 1, 1);
+    dtw->_coord_status->attach(*label_y, 1, 1, 1, 1);
+    dtw->_coord_status_x = Gtk::manage(new Gtk::Label());
+    dtw->_coord_status_y = Gtk::manage(new Gtk::Label());
+    dtw->_coord_status_x->set_name("CoordinateStatusX");
+    dtw->_coord_status_y->set_name("CoordinateStatusY");
+    dtw->_coord_status_x->set_markup("   0.00 ");
+    dtw->_coord_status_y->set_markup("   0.00 ");
+
+    auto label_z = Gtk::manage(new Gtk::Label(_("Z:")));
+    label_z->set_name("ZLabel");
+    auto label_r = Gtk::manage(new Gtk::Label(_("R:")));
+    label_r->set_name("RLabel");
+
+    dtw->_coord_status_x->set_halign(Gtk::ALIGN_END);
+    dtw->_coord_status_y->set_halign(Gtk::ALIGN_END);
+    dtw->_coord_status->attach(*dtw->_coord_status_x, 2, 0, 1, 1);
+    dtw->_coord_status->attach(*dtw->_coord_status_y, 2, 1, 1, 1);
+
+    dtw->_coord_status->attach(*label_z, 3, 0, 1, 2);
+    dtw->_coord_status->attach(*dtw->_zoom_status, 4, 0, 1, 2);
+
+    dtw->_coord_status->attach(*label_r, 5, 0, 1, 2);
+    dtw->_coord_status->attach(*dtw->_rotation_status, 6, 0, 1, 2);
+
+    dtw->_statusbar->pack_end(*dtw->_coord_status, false, false);
+
+    // --------------- Color Management ---------------- //
+    dtw->_tracker = ege_color_prof_tracker_new(GTK_WIDGET(dtw->layer_selector->gobj()));
+#if defined(HAVE_LIBLCMS2)
+    bool fromDisplay = prefs->getBool( "/options/displayprofile/from_display");
+    if ( fromDisplay ) {
+        Glib::ustring id = Inkscape::CMSSystem::getDisplayId( 0 );
+
+        bool enabled = false;
+        dtw->_canvas->_cms_key = id;
+        enabled = !dtw->_canvas->_cms_key.empty();
+        dtw->cms_adjust_set_sensitive(enabled);
+    }
+    g_signal_connect( G_OBJECT(dtw->_tracker), "changed", G_CALLBACK(SPDesktopWidget::color_profile_event), dtw );
+#endif // defined(HAVE_LIBLCMS2)
+
+    // ------------------ Finish Up -------------------- //
+    dtw->_vbox->show_all();
+
+    gtk_widget_grab_focus (GTK_WIDGET(dtw->_canvas));
+
+    // If this is the first desktop created, report the time it takes to show up
+    if ( overallTimer ) {
+        if ( prefs->getBool("/dialogs/debug/trackAppear", false) ) {
+            // Time tracker takes ownership of the timer.
+            AppearTimeTracker *tracker = new AppearTimeTracker(overallTimer, GTK_WIDGET(dtw), "first SPDesktopWidget");
+            tracker->setAutodelete(true);
+        } else {
+            g_timer_destroy(overallTimer);
+        }
+        overallTimer = nullptr;
+    }
+    // Ensure that ruler ranges are updated correctly whenever the canvas table
+    // is resized
+    dtw->_canvas_tbl_size_allocate_connection = dtw->_canvas_tbl->signal_size_allocate().connect(sigc::mem_fun(dtw, &SPDesktopWidget::canvas_tbl_size_allocate));
+}
+
+/**
+ * Called before SPDesktopWidget destruction.
+ */
+void
+SPDesktopWidget::dispose(GObject *object)
+{
+    SPDesktopWidget *dtw = SP_DESKTOP_WIDGET (object);
+
+    if (dtw == nullptr) {
+        return;
+    }
+
+    UXManager::getInstance()->delTrack(dtw);
+
+    if (dtw->desktop) {
+        if ( watcher ) {
+            watcher->remove(dtw);
+        }
+
+        // Zoom
+        dtw->_zoom_status_input_connection.disconnect();
+        dtw->_zoom_status_output_connection.disconnect();
+        g_signal_handlers_disconnect_matched (G_OBJECT (dtw->_zoom_status->gobj()), G_SIGNAL_MATCH_DATA, 0, 0, nullptr, nullptr, dtw->_zoom_status);
+        dtw->_zoom_status_value_changed_connection.disconnect();
+        dtw->_zoom_status_populate_popup_connection.disconnect();
+
+        // Rotation
+        dtw->_rotation_status_input_connection.disconnect();
+        dtw->_rotation_status_output_connection.disconnect();
+        g_signal_handlers_disconnect_matched (G_OBJECT (dtw->_rotation_status->gobj()), G_SIGNAL_MATCH_DATA, 0, 0, nullptr, nullptr, dtw->_rotation_status);
+        dtw->_rotation_status_value_changed_connection.disconnect();
+        dtw->_rotation_status_populate_popup_connection.disconnect();
+
+        // Canvas
+        g_signal_handlers_disconnect_by_func (G_OBJECT (dtw->_canvas), (gpointer) G_CALLBACK (SPDesktopWidget::event), dtw);
+        dtw->_canvas_tbl_size_allocate_connection.disconnect();
+
+        dtw->layer_selector->setDesktop(nullptr);
+        dtw->layer_selector->unreference();
+        INKSCAPE.remove_desktop(dtw->desktop); // clears selection and event_context
+        dtw->modified_connection.disconnect();
+        dtw->desktop->destroy();
+        Inkscape::GC::release (dtw->desktop);
+        dtw->desktop = nullptr;
+    }
+
+    dtw->modified_connection.~connection();
+
+    if (G_OBJECT_CLASS (dtw_parent_class)->dispose) {
+        (* G_OBJECT_CLASS (dtw_parent_class)->dispose) (object);
+    }
+}
+
+/**
+ * Set the title in the desktop-window (if desktop has an own window).
+ *
+ * The title has form file name: desktop number - Inkscape.
+ * The desktop number is only shown if it's 2 or higher,
+ */
+void
+SPDesktopWidget::updateTitle(gchar const* uri)
+{
+    if (window) {
+
+        SPDocument *doc = this->desktop->doc();
+
+        std::string Name;
+        if (doc->isModifiedSinceSave()) {
+            Name += "*";
+        }
+
+        Name += uri;
+
+        if (desktop->number > 1) {
+            Name += ": ";
+            Name += std::to_string(desktop->number);
+        }
+        Name += " (";
+
+        if (desktop->getMode() == Inkscape::RENDERMODE_OUTLINE) {
+            Name += N_("outline");
+        } else if (desktop->getMode() == Inkscape::RENDERMODE_NO_FILTERS) {
+            Name += N_("no filters");
+        } else if (desktop->getMode() == Inkscape::RENDERMODE_VISIBLE_HAIRLINES) {
+            Name += N_("visible hairlines");
+        }
+
+        if (desktop->getColorMode() != Inkscape::COLORMODE_NORMAL &&
+            desktop->getMode()      != Inkscape::RENDERMODE_NORMAL) {
+                Name += ", ";
+        }
+
+        if (desktop->getColorMode() == Inkscape::COLORMODE_GRAYSCALE) {
+            Name += N_("grayscale");
+        } else if (desktop->getColorMode() == Inkscape::COLORMODE_PRINT_COLORS_PREVIEW) {
+            Name += N_("print colors preview");
+        }
+
+        if (*Name.rbegin() == '(') {  // Can not use C++11 .back() or .pop_back() with ustring!
+            Name.erase(Name.size() - 2);
+        } else {
+            Name += ")";
+        }
+
+        Name += " - Inkscape";
+
+        // Name += " (";
+        // Name += Inkscape::version_string;
+        // Name += ")";
+
+        window->set_title (Name);
+    }
+}
+
+Inkscape::UI::Widget::Dock*
+SPDesktopWidget::getDock()
+{
+    return _dock;
+}
+
+/**
+ * Callback to allocate space for desktop widget.
+ */
+static void
+sp_desktop_widget_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
+{
+    SPDesktopWidget *dtw = SP_DESKTOP_WIDGET (widget);
+    GtkAllocation widg_allocation;
+    gtk_widget_get_allocation(widget, &widg_allocation);
+
+    if ((allocation->x == widg_allocation.x) &&
+        (allocation->y == widg_allocation.y) &&
+        (allocation->width == widg_allocation.width) &&
+        (allocation->height == widg_allocation.height)) {
+        if (GTK_WIDGET_CLASS (dtw_parent_class)->size_allocate)
+            GTK_WIDGET_CLASS (dtw_parent_class)->size_allocate (widget, allocation);
+        return;
+    }
+
+    if (gtk_widget_get_realized (widget)) {
+        Geom::Rect const area = dtw->desktop->get_display_area();
+        Geom::Rect const d_canvas = dtw->desktop->getCanvas()->getViewbox();
+        Geom::Point midpoint = dtw->desktop->w2d(d_canvas.midpoint());
+
+        double zoom = dtw->desktop->current_zoom();
+
+        if (GTK_WIDGET_CLASS(dtw_parent_class)->size_allocate) {
+            GTK_WIDGET_CLASS(dtw_parent_class)->size_allocate (widget, allocation);
+        }
+
+        if (dtw->get_sticky_zoom_active()) {
+            /* Find new visible area */
+            Geom::Rect newarea = dtw->desktop->get_display_area();
+            /* Calculate adjusted zoom */
+            double oldshortside = MIN(   area.width(),    area.height());
+            double newshortside = MIN(newarea.width(), newarea.height());
+            zoom *= newshortside / oldshortside;
+        }
+        dtw->desktop->zoom_absolute_center_point (midpoint, zoom);
+
+        // TODO - Should call show_dialogs() from sp_namedview_window_from_document only.
+        // But delaying the call to here solves dock sizing issues on OS X, (see #171579)
+        dtw->desktop->show_dialogs();
+
+    } else {
+        if (GTK_WIDGET_CLASS (dtw_parent_class)->size_allocate) {
+            GTK_WIDGET_CLASS (dtw_parent_class)->size_allocate (widget, allocation);
+        }
+//            this->size_allocate (widget, allocation);
+    }
+}
+
+#ifdef GDK_WINDOWING_QUARTZ
+static GtkMenuItem *_get_help_menu(GtkMenuShell *menu)
+{
+    // Assume "Help" is the last child in menu
+    GtkMenuItem *last = nullptr;
+    auto callback = [](GtkWidget *widget, gpointer data) {
+        *static_cast<GtkMenuItem **>(data) = GTK_MENU_ITEM(widget);
+    };
+    gtk_container_foreach(GTK_CONTAINER(menu), callback, &last);
+    return last;
+}
+#endif
+
+/**
+ * Callback to realize desktop widget.
+ */
+static void
+sp_desktop_widget_realize (GtkWidget *widget)
+{
+
+    SPDesktopWidget *dtw = SP_DESKTOP_WIDGET (widget);
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+    if (GTK_WIDGET_CLASS (dtw_parent_class)->realize)
+        (* GTK_WIDGET_CLASS (dtw_parent_class)->realize) (widget);
+
+    Geom::Rect d = Geom::Rect::from_xywh(Geom::Point(0,0), (dtw->desktop->doc())->getDimensions());
+
+    if (d.width() < 1.0 || d.height() < 1.0) return;
+
+    dtw->desktop->set_display_area (d, 10);
+
+    dtw->updateNamedview();
+    gchar *gtkThemeName;
+    gboolean gtkApplicationPreferDarkTheme;
+    GtkSettings *settings = gtk_settings_get_default();
+    Gtk::Window *window = SP_ACTIVE_DESKTOP->getToplevel();
+    if (settings && window) {
+        g_object_get(settings, "gtk-theme-name", &gtkThemeName, NULL);
+        g_object_get(settings, "gtk-application-prefer-dark-theme", &gtkApplicationPreferDarkTheme, NULL);
+        bool dark = Glib::ustring(gtkThemeName).find(":dark") != std::string::npos;
+        if (!dark) {
+            Glib::RefPtr<Gtk::StyleContext> stylecontext = window->get_style_context();
+            Gdk::RGBA rgba;
+            bool background_set = stylecontext->lookup_color("theme_bg_color", rgba);
+            if (background_set && (0.299 * rgba.get_red() + 0.587 * rgba.get_green() + 0.114 * rgba.get_blue()) < 0.5) {
+                dark = true;
+            }
+        }
+        if (dark) {
+            window->get_style_context()->add_class("dark");
+            window->get_style_context()->remove_class("bright");
+        } else {
+            window->get_style_context()->add_class("bright");
+            window->get_style_context()->remove_class("dark");
+        }
+        if (prefs->getBool("/theme/symbolicIcons", false)) {
+            window->get_style_context()->add_class("symbolic");
+            window->get_style_context()->remove_class("regular");
+        } else {
+            window->get_style_context()->add_class("regular");
+            window->get_style_context()->remove_class("symbolic");
+        }
+        INKSCAPE.signal_change_theme.emit();
+    }
+
+#ifdef GDK_WINDOWING_QUARTZ
+    // native macOS menu
+    auto osxapp = gtkosx_application_get();
+    auto menushell = static_cast<Gtk::MenuShell *>(dtw->menubar());
+    if (osxapp && menushell && window) {
+        menushell->set_parent(*window);
+        gtkosx_application_set_menu_bar(osxapp, menushell->gobj());
+        // using quartz accelerators gives menu shortcuts priority over everything else,
+        // messes up text input because Inkscape has single key shortcuts (e.g. 1-6).
+        gtkosx_application_set_use_quartz_accelerators(osxapp, false);
+        gtkosx_application_set_help_menu(osxapp, _get_help_menu(menushell->gobj()));
+
+        // Window menu disabled because hidden windows which are brought back
+        // from the menu are non-functional.
+        // https://gitlab.com/inkscape/inkscape/-/issues/1105
+#if 0
+        gtkosx_application_set_window_menu(osxapp, nullptr);
+#endif
+
+        // move some items to "Inkscape" menu
+        unsigned app_menu_verbs[] = {
+            SP_VERB_NONE,
+            SP_VERB_DIALOG_INPUT,
+            SP_VERB_DIALOG_DISPLAY,
+            SP_VERB_NONE,
+            SP_VERB_HELP_ABOUT,
+        };
+        for (auto verb : app_menu_verbs) {
+            GtkWidget *menuitem = nullptr;
+            if (verb == SP_VERB_NONE) {
+                menuitem = gtk_separator_menu_item_new();
+            } else if (auto item = get_menu_item_for_verb(verb, dtw->desktop)) {
+                menuitem = static_cast<Gtk::Widget *>(item)->gobj();
+            } else {
+                continue;
+            }
+            // Don't use index 0 because it appends the app name. Index 1
+            // seems to work perfectly with inserting items in reverse order.
+            gtkosx_application_insert_app_menu_item(osxapp, menuitem, 1);
+        }
+    }
+#endif
+}
+
+/* This is just to provide access to common functionality from sp_desktop_widget_realize() above
+   as well as from SPDesktop::change_document() */
+void SPDesktopWidget::updateNamedview()
+{
+    // Listen on namedview modification
+    // originally (prior to the sigc++ conversion) the signal was simply
+    // connected twice rather than disconnecting the first connection
+    modified_connection.disconnect();
+
+    modified_connection = desktop->namedview->connectModified(sigc::mem_fun(*this, &SPDesktopWidget::namedviewModified));
+    namedviewModified(desktop->namedview, SP_OBJECT_MODIFIED_FLAG);
+
+    updateTitle( desktop->doc()->getDocumentName() );
+}
+
+/**
+ * Callback to handle desktop widget event.
+ */
+gint
+SPDesktopWidget::event(GtkWidget *widget, GdkEvent *event, SPDesktopWidget *dtw)
+{
+    if (event->type == GDK_BUTTON_PRESS) {
+        // defocus any spinbuttons
+        gtk_widget_grab_focus (GTK_WIDGET(dtw->_canvas));
+    }
+
+    if ((event->type == GDK_BUTTON_PRESS) && (event->button.button == 3)) {
+        if (event->button.state & GDK_SHIFT_MASK) {
+            sp_canvas_arena_set_sticky (SP_CANVAS_ARENA (dtw->desktop->drawing), TRUE);
+        } else {
+            sp_canvas_arena_set_sticky (SP_CANVAS_ARENA (dtw->desktop->drawing), FALSE);
+        }
+    }
+
+    if (GTK_WIDGET_CLASS (dtw_parent_class)->event) {
+        return (* GTK_WIDGET_CLASS (dtw_parent_class)->event) (widget, event);
+    } else {
+        // The key press/release events need to be passed to desktop handler explicitly,
+        // because otherwise the event contexts only receive key events when the mouse cursor
+        // is over the canvas. This redirection is only done for key events and only if there's no
+        // current item on the canvas, because item events and all mouse events are caught
+        // and passed on by the canvas acetate (I think). --bb
+
+        if ((event->type == GDK_KEY_PRESS || event->type == GDK_KEY_RELEASE)
+                && !dtw->_canvas->_current_item) {
+            return sp_desktop_root_handler (nullptr, event, dtw->desktop);
+        }
+    }
+
+    return FALSE;
+}
+
+#if defined(HAVE_LIBLCMS2)
+void
+SPDesktopWidget::color_profile_event(EgeColorProfTracker */*tracker*/, SPDesktopWidget *dtw)
+{
+    // Handle profile changes
+    GdkScreen* screen = gtk_widget_get_screen(GTK_WIDGET(dtw));
+    GdkWindow *window = gtk_widget_get_window(gtk_widget_get_toplevel(GTK_WIDGET(dtw)));
+
+    // Figure out the ID for the monitor
+    auto display = gdk_display_get_default();
+    auto monitor = gdk_display_get_monitor_at_window(display, window);
+
+    int n_monitors = gdk_display_get_n_monitors(display);
+
+    int monitorNum = -1;
+
+    // Now loop through the set of monitors and figure out whether this monitor matches
+    for (int i_monitor = 0; i_monitor < n_monitors; ++i_monitor) {
+        auto monitor_at_index = gdk_display_get_monitor(display, i_monitor);
+        if(monitor_at_index == monitor) monitorNum = i_monitor;
+    }
+
+    Glib::ustring id = Inkscape::CMSSystem::getDisplayId( monitorNum );
+    bool enabled = false;
+    dtw->_canvas->_cms_key = id;
+    dtw->requestCanvasUpdate();
+    enabled = !dtw->_canvas->_cms_key.empty();
+    dtw->cms_adjust_set_sensitive(enabled);
+}
+#else // defined(HAVE_LIBLCMS2)
+void sp_dtw_color_profile_event(EgeColorProfTracker */*tracker*/, SPDesktopWidget * /*dtw*/)
+{
+}
+#endif // defined(HAVE_LIBLCMS2)
+
+void
+SPDesktopWidget::update_guides_lock()
+{
+    bool down = _guides_lock->get_active();
+
+    auto doc  = desktop->getDocument();
+    auto nv   = desktop->getNamedView();
+    auto repr = nv->getRepr();
+
+    if ( down != nv->lockguides ) {
+        nv->lockguides = down;
+        sp_namedview_guides_toggle_lock(doc, nv);
+        if (down) {
+            setMessage (Inkscape::NORMAL_MESSAGE, _("Locked all guides"));
+        } else {
+            setMessage (Inkscape::NORMAL_MESSAGE, _("Unlocked all guides"));
+        }
+    }
+}
+
+#if defined(HAVE_LIBLCMS2)
+void
+SPDesktopWidget::cms_adjust_toggled( GtkWidget */*button*/, gpointer data )
+{
+    SPDesktopWidget *dtw = SP_DESKTOP_WIDGET(data);
+
+    bool down = dtw->_cms_adjust->get_active();
+    if ( down != dtw->_canvas->_enable_cms_display_adj ) {
+        dtw->_canvas->_enable_cms_display_adj = down;
+        dtw->desktop->redrawDesktop();
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        prefs->setBool("/options/displayprofile/enable", down);
+        if (down) {
+            dtw->setMessage (Inkscape::NORMAL_MESSAGE, _("Color-managed display is <b>enabled</b> in this window"));
+        } else {
+            dtw->setMessage (Inkscape::NORMAL_MESSAGE, _("Color-managed display is <b>disabled</b> in this window"));
+        }
+    }
+}
+#endif // defined(HAVE_LIBLCMS2)
+
+void
+SPDesktopWidget::cms_adjust_set_sensitive(bool enabled)
+{
+    Inkscape::Verb* verb = Inkscape::Verb::get( SP_VERB_VIEW_CMS_TOGGLE );
+    if ( verb ) {
+        SPAction *act = verb->get_action( Inkscape::ActionContext(viewwidget.view) );
+        if ( act ) {
+            sp_action_set_sensitive( act, enabled );
+        }
+    }
+    _cms_adjust->set_sensitive(enabled);
+}
+
+void
+sp_dtw_desktop_activate (SPDesktopWidget */*dtw*/)
+{
+    /* update active desktop indicator */
+}
+
+void
+sp_dtw_desktop_deactivate (SPDesktopWidget */*dtw*/)
+{
+    /* update inactive desktop indicator */
+}
+
+/**
+ *  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.
+ */
+bool
+SPDesktopWidget::shutdown()
+{
+    g_assert(desktop != nullptr);
+
+    if (INKSCAPE.sole_desktop_for_document(*desktop)) {
+        SPDocument *doc = desktop->doc();
+        if (doc->isModifiedSinceSave()) {
+            Gtk::Window *toplevel_window = Glib::wrap(GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(this))));
+            Glib::ustring message = g_markup_printf_escaped(
+                _("<span weight=\"bold\" size=\"larger\">Save changes to document \"%s\" before closing?</span>\n\n"
+                  "If you close without saving, your changes will be discarded."),
+                doc->getDocumentName());
+            Gtk::MessageDialog dialog = Gtk::MessageDialog(*toplevel_window, message, true, Gtk::MESSAGE_WARNING, Gtk::BUTTONS_NONE);
+            dialog.property_destroy_with_parent() = true;
+
+            // fix for bug lp:168809
+            Gtk::Container *ma = dialog.get_message_area();
+            std::vector<Gtk::Widget*> ma_labels = ma->get_children();
+            ma_labels[0]->set_can_focus(false);
+
+            Gtk::Button close_button(_("Close _without saving"), true);
+            close_button.show();
+            dialog.add_action_widget(close_button, Gtk::RESPONSE_NO);
+
+            dialog.add_button(_("_Cancel"), Gtk::RESPONSE_CANCEL);
+            dialog.add_button(_("_Save"), Gtk::RESPONSE_YES);
+            dialog.set_default_response(Gtk::RESPONSE_YES);
+
+            gint response = dialog.run();
+
+            switch (response) {
+            case GTK_RESPONSE_YES:
+            {
+                doc->doRef();
+                sp_namedview_document_from_window(desktop);
+                if (sp_file_save_document(*window, doc)) {
+                    doc->doUnref();
+                } else { // save dialog cancelled or save failed
+                    doc->doUnref();
+                    return TRUE;
+                }
+
+                break;
+            }
+            case GTK_RESPONSE_NO:
+                break;
+            default: // cancel pressed, or dialog was closed
+                return TRUE;
+                break;
+            }
+        }
+        /* Code to check data loss */
+        bool allow_data_loss = FALSE;
+        while (doc->getReprRoot()->attribute("inkscape:dataloss") != nullptr && allow_data_loss == FALSE) {
+            Gtk::Window *toplevel_window = Glib::wrap(GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(this))));
+            Glib::ustring message = g_markup_printf_escaped(
+                _("<span weight=\"bold\" size=\"larger\">The file \"%s\" was saved with a format that may cause data loss!</span>\n\n"
+                  "Do you want to save this file as Inkscape SVG?"),
+                doc->getDocumentName() ? doc->getDocumentName() : "Unnamed");
+            Gtk::MessageDialog dialog = Gtk::MessageDialog(*toplevel_window, message, true, Gtk::MESSAGE_WARNING, Gtk::BUTTONS_NONE);
+            dialog.property_destroy_with_parent() = true;
+
+            // fix for bug lp:168809
+            Gtk::Container *ma = dialog.get_message_area();
+            std::vector<Gtk::Widget*> ma_labels = ma->get_children();
+            ma_labels[0]->set_can_focus(false);
+
+            Gtk::Button close_button(_("Close _without saving"), true);
+            close_button.show();
+            dialog.add_action_widget(close_button, Gtk::RESPONSE_NO);
+
+            dialog.add_button(_("_Cancel"), Gtk::RESPONSE_CANCEL);
+
+            Gtk::Button save_button(_("_Save as Inkscape SVG"), true);
+            save_button.set_can_default(true);
+            save_button.show();
+            dialog.add_action_widget(save_button, Gtk::RESPONSE_YES);
+            dialog.set_default_response(Gtk::RESPONSE_YES);
+
+            gint response = dialog.run();
+
+            switch (response) {
+            case GTK_RESPONSE_YES:
+            {
+                doc->doRef();
+
+                if (sp_file_save_dialog(*window, doc, Inkscape::Extension::FILE_SAVE_METHOD_INKSCAPE_SVG)) {
+                    doc->doUnref();
+                } else { // save dialog cancelled or save failed
+                    doc->doUnref();
+                    return TRUE;
+                }
+
+                break;
+            }
+            case GTK_RESPONSE_NO:
+                allow_data_loss = TRUE;
+                break;
+            default: // cancel pressed, or dialog was closed
+                return TRUE;
+                break;
+            }
+        }
+    }
+
+    /* Save window geometry to prefs for use as a default.
+     * Use depends on setting of "options.savewindowgeometry".
+     * But we save the info here regardless of the setting.
+     */
+    storeDesktopPosition();
+
+    return FALSE;
+}
+
+/**
+ * \store dessktop position
+ */
+void SPDesktopWidget::storeDesktopPosition()
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    bool maxed = desktop->is_maximized();
+    bool full = desktop->is_fullscreen();
+    prefs->setBool("/desktop/geometry/fullscreen", full);
+    prefs->setBool("/desktop/geometry/maximized", maxed);
+    gint w, h, x, y;
+    desktop->getWindowGeometry(x, y, w, h);
+    // Don't save geom for maximized windows.  It
+    // just tells you the current maximized size, which is not
+    // as useful as whatever value it had previously.
+    if (!maxed && !full) {
+        prefs->setInt("/desktop/geometry/width", w);
+        prefs->setInt("/desktop/geometry/height", h);
+        prefs->setInt("/desktop/geometry/x", x);
+        prefs->setInt("/desktop/geometry/y", y);
+    }
+}
+
+/**
+ * \pre this->desktop->main != 0
+ */
+void
+SPDesktopWidget::requestCanvasUpdate() {
+    // ^^ also this->desktop != 0
+    g_return_if_fail(this->desktop != nullptr);
+    g_return_if_fail(this->desktop->main != nullptr);
+    gtk_widget_queue_draw (GTK_WIDGET (SP_CANVAS_ITEM (this->desktop->main)->canvas));
+}
+
+void
+SPDesktopWidget::requestCanvasUpdateAndWait() {
+    requestCanvasUpdate();
+
+    while (gtk_events_pending())
+      gtk_main_iteration_do(FALSE);
+
+}
+
+void
+SPDesktopWidget::enableInteraction()
+{
+  g_return_if_fail(_interaction_disabled_counter > 0);
+
+  _interaction_disabled_counter--;
+
+  if (_interaction_disabled_counter == 0) {
+    gtk_widget_set_sensitive(GTK_WIDGET(this), TRUE);
+  }
+}
+
+void
+SPDesktopWidget::disableInteraction()
+{
+  if (_interaction_disabled_counter == 0) {
+    gtk_widget_set_sensitive(GTK_WIDGET(this), FALSE);
+  }
+
+  _interaction_disabled_counter++;
+}
+
+void
+SPDesktopWidget::setCoordinateStatus(Geom::Point p)
+{
+    gchar *cstr;
+    cstr = g_strdup_printf("%7.2f", _dt2r * p[Geom::X]);
+    _coord_status_x->set_markup(cstr);
+    g_free(cstr);
+
+    cstr = g_strdup_printf("%7.2f", _dt2r * p[Geom::Y]);
+    _coord_status_y->set_markup(cstr);
+    g_free(cstr);
+}
+
+void
+SPDesktopWidget::letZoomGrabFocus()
+{
+    if (_zoom_status) _zoom_status->grab_focus();
+}
+
+void
+SPDesktopWidget::getWindowGeometry (gint &x, gint &y, gint &w, gint &h)
+{
+    if (window)
+    {
+        window->get_size (w, h);
+        window->get_position (x, y);
+    }
+}
+
+void
+SPDesktopWidget::setWindowPosition (Geom::Point p)
+{
+    if (window)
+    {
+        window->move (gint(round(p[Geom::X])), gint(round(p[Geom::Y])));
+    }
+}
+
+void
+SPDesktopWidget::setWindowSize (gint w, gint h)
+{
+    if (window)
+    {
+        window->set_default_size (w, h);
+        window->resize (w, h);
+    }
+}
+
+#ifdef __APPLE__
+/**
+ * This should be a no-op, but on macOS it raises the given transient window to the
+ * top of other transient windows from the same parent.
+ */
+static gboolean transient_focus_in_callback(GtkWindow *window, GdkEvent *, gpointer)
+{
+    gtk_window_set_transient_for(window, gtk_window_get_transient_for(window));
+    return FALSE;
+}
+#endif
+
+/**
+ * \note transientizing does not work on windows; when you minimize a document
+ * and then open it back, only its transient emerges and you cannot access
+ * the document window. The document window must be restored by rightclicking
+ * the taskbar button and pressing "Restore"
+ */
+void
+SPDesktopWidget::setWindowTransient (void *p, int transient_policy)
+{
+    if (window)
+    {
+        GtkWindow *w = GTK_WINDOW(window->gobj());
+
+#ifdef __APPLE__
+        // Workaround for https://gitlab.gnome.org/GNOME/gtk/issues/2436
+        // The first time this window is made transient, connect the focus-in event to
+        // re-transientize the window in order to raise it above other transient windows.
+        if (gtk_window_get_transient_for(GTK_WINDOW(p)) == nullptr) {
+            g_signal_connect(GTK_WIDGET(p), "focus-in-event", G_CALLBACK(transient_focus_in_callback), nullptr);
+        }
+#endif
+
+        gtk_window_set_transient_for (GTK_WINDOW(p), w);
+
+        /*
+         * This enables "aggressive" transientization,
+         * i.e. dialogs always emerging on top when you switch documents. Note
+         * however that this breaks "click to raise" policy of a window
+         * manager because the switched-to document will be raised at once
+         * (so that its transients also could raise)
+         */
+        if (transient_policy == 2)
+            // without this, a transient window not always emerges on top
+            gtk_window_present (w);
+    }
+}
+
+void
+SPDesktopWidget::presentWindow()
+{
+    GtkWindow *w =GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(this)));
+    if (w)
+        gtk_window_present (w);
+}
+
+bool SPDesktopWidget::showInfoDialog( Glib::ustring const &message )
+{
+    bool result = false;
+    Gtk::Window *window = Glib::wrap(GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(this))));
+    if (window)
+    {
+        Gtk::MessageDialog dialog(*window, message, false, Gtk::MESSAGE_INFO, Gtk::BUTTONS_OK);
+        dialog.property_destroy_with_parent() = true;
+        dialog.set_name("InfoDialog");
+        dialog.set_title(_("Note:")); // probably want to take this as a parameter.
+        dialog.run();
+    }
+    return result;
+}
+
+bool SPDesktopWidget::warnDialog (Glib::ustring const &text)
+{
+    Gtk::MessageDialog dialog (*window, text, false, Gtk::MESSAGE_WARNING, Gtk::BUTTONS_OK_CANCEL);
+    gint response = dialog.run();
+    if (response == Gtk::RESPONSE_OK)
+        return true;
+    else
+        return false;
+}
+
+void
+SPDesktopWidget::iconify()
+{
+    GtkWindow *topw = GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(_canvas)));
+    if (GTK_IS_WINDOW(topw)) {
+        if (desktop->is_iconified()) {
+            gtk_window_deiconify(topw);
+        } else {
+            gtk_window_iconify(topw);
+        }
+    }
+}
+
+void
+SPDesktopWidget::maximize()
+{
+    GtkWindow *topw = GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(_canvas)));
+    if (GTK_IS_WINDOW(topw)) {
+        if (desktop->is_maximized()) {
+            gtk_window_unmaximize(topw);
+        } else {
+            // Save geometry to prefs before maximizing so that
+            // something useful is stored there, because GTK doesn't maintain
+            // a separate non-maximized size.
+            if (!desktop->is_iconified() && !desktop->is_fullscreen())
+            {
+                Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+                gint w = -1;
+                gint h, x, y;
+                getWindowGeometry(x, y, w, h);
+                g_assert(w != -1);
+                prefs->setInt("/desktop/geometry/width", w);
+                prefs->setInt("/desktop/geometry/height", h);
+                prefs->setInt("/desktop/geometry/x", x);
+                prefs->setInt("/desktop/geometry/y", y);
+            }
+            gtk_window_maximize(topw);
+        }
+    }
+}
+
+void
+SPDesktopWidget::fullscreen()
+{
+    GtkWindow *topw = GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(_canvas)));
+    if (GTK_IS_WINDOW(topw)) {
+        if (desktop->is_fullscreen()) {
+            gtk_window_unfullscreen(topw);
+            // widget layout is triggered by the resulting window_state_event
+        } else {
+            // Save geometry to prefs before maximizing so that
+            // something useful is stored there, because GTK doesn't maintain
+            // a separate non-maximized size.
+            if (!desktop->is_iconified() && !desktop->is_maximized())
+            {
+                Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+                gint w, h, x, y;
+                getWindowGeometry(x, y, w, h);
+                prefs->setInt("/desktop/geometry/width", w);
+                prefs->setInt("/desktop/geometry/height", h);
+                prefs->setInt("/desktop/geometry/x", x);
+                prefs->setInt("/desktop/geometry/y", y);
+            }
+            gtk_window_fullscreen(topw);
+            // widget layout is triggered by the resulting window_state_event
+        }
+    }
+}
+
+/**
+ * Hide whatever the user does not want to see in the window
+ */
+void SPDesktopWidget::layoutWidgets()
+{
+    SPDesktopWidget *dtw = this;
+    Glib::ustring pref_root;
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+    if (dtw->desktop->is_focusMode()) {
+        pref_root = "/focus/";
+    } else if (dtw->desktop->is_fullscreen()) {
+        pref_root = "/fullscreen/";
+    } else {
+        pref_root = "/window/";
+    }
+
+    if (!prefs->getBool(pref_root + "commands/state", true)) {
+        gtk_widget_hide (dtw->commands_toolbox);
+    } else {
+        gtk_widget_show_all (dtw->commands_toolbox);
+    }
+
+    if (!prefs->getBool(pref_root + "snaptoolbox/state", true)) {
+        gtk_widget_hide (dtw->snap_toolbox);
+    } else {
+        gtk_widget_show_all (dtw->snap_toolbox);
+    }
+
+    if (!prefs->getBool(pref_root + "toppanel/state", true)) {
+        gtk_widget_hide (dtw->aux_toolbox);
+    } else {
+        // we cannot just show_all because that will show all tools' panels;
+        // this is a function from toolbox.cpp that shows only the current tool's panel
+        ToolboxFactory::showAuxToolbox(dtw->aux_toolbox);
+    }
+
+    if (!prefs->getBool(pref_root + "toolbox/state", true)) {
+        gtk_widget_hide (dtw->tool_toolbox);
+    } else {
+        gtk_widget_show_all (dtw->tool_toolbox);
+    }
+
+    if (!prefs->getBool(pref_root + "statusbar/state", true)) {
+        dtw->_statusbar->hide();
+    } else {
+        dtw->_statusbar->show_all();
+    }
+
+    if (!prefs->getBool(pref_root + "panels/state", true)) {
+        dtw->_panels->hide();
+    } else {
+        dtw->_panels->show_all();
+    }
+
+    if (!prefs->getBool(pref_root + "scrollbars/state", true)) {
+        dtw->_hscrollbar->hide();
+        dtw->_vscrollbar_box->hide();
+        dtw->_cms_adjust->hide();
+    } else {
+        dtw->_hscrollbar->show_all();
+        dtw->_vscrollbar_box->show_all();
+        dtw->_cms_adjust->show_all();
+    }
+
+    if (!prefs->getBool(pref_root + "rulers/state", true)) {
+        dtw->_guides_lock->hide();
+        dtw->_hruler->hide();
+        dtw->_vruler->hide();
+    } else {
+        dtw->_guides_lock->show_all();
+        dtw->_hruler->show_all();
+        dtw->_vruler->show_all();
+    }
+}
+
+Gtk::Toolbar *
+SPDesktopWidget::get_toolbar_by_name(const Glib::ustring& name)
+{
+    // The name is actually attached to the GtkGrid that contains
+    // the toolbar, so we need to get the grid first
+    auto widget = sp_search_by_name_recursive(Glib::wrap(aux_toolbox), name);
+    auto grid = dynamic_cast<Gtk::Grid*>(widget);
+
+    if (!grid) return nullptr;
+
+    auto child = grid->get_child_at(0,0);
+    auto tb = dynamic_cast<Gtk::Toolbar*>(child);
+
+    return tb;
+}
+
+void
+SPDesktopWidget::setToolboxFocusTo (const gchar* label)
+{
+    // First try looking for a named widget
+    auto hb = sp_search_by_name_recursive(Glib::wrap(aux_toolbox), label);
+
+    // Fallback to looking for a named data member (deprecated)
+    if (!hb) {
+        hb = Glib::wrap(GTK_WIDGET(sp_search_by_data_recursive(aux_toolbox, (gpointer) label)));
+    }
+
+    if (hb)
+    {
+        hb->grab_focus();
+    }
+}
+
+void
+SPDesktopWidget::setToolboxAdjustmentValue (gchar const *id, double value)
+{
+    // First try looking for a named widget
+    auto hb = sp_search_by_name_recursive(Glib::wrap(aux_toolbox), id);
+
+    // Fallback to looking for a named data member (deprecated)
+    if (!hb) {
+        hb = Glib::wrap(GTK_WIDGET(sp_search_by_data_recursive(aux_toolbox, (gpointer)id)));
+    }
+
+    if (hb) {
+        auto sb = dynamic_cast<Inkscape::UI::Widget::SpinButtonToolItem *>(hb);
+        auto a = sb->get_adjustment();
+
+        if(a) a->set_value(value);
+    }
+
+    else g_warning ("Could not find GtkAdjustment for %s\n", id);
+}
+
+
+bool
+SPDesktopWidget::isToolboxButtonActive (const gchar* id)
+{
+    bool isActive = false;
+    gpointer thing = sp_search_by_data_recursive(aux_toolbox, (gpointer) id);
+    if ( !thing ) {
+        //g_message( "Unable to locate item for {%s}", id );
+    } else if ( GTK_IS_TOGGLE_BUTTON(thing) ) {
+        GtkToggleButton *b = GTK_TOGGLE_BUTTON(thing);
+        isActive = gtk_toggle_button_get_active( b ) != 0;
+    } else if ( GTK_IS_TOGGLE_ACTION(thing) ) {
+        GtkToggleAction* act = GTK_TOGGLE_ACTION(thing);
+        isActive = gtk_toggle_action_get_active( act ) != 0;
+    } else if ( GTK_IS_TOGGLE_TOOL_BUTTON(thing) ) {
+        GtkToggleToolButton *b = GTK_TOGGLE_TOOL_BUTTON(thing);
+        isActive = gtk_toggle_tool_button_get_active( b ) != 0;
+    } else {
+        //g_message( "Item for {%s} is of an unsupported type", id );
+    }
+
+    return isActive;
+}
+
+void SPDesktopWidget::setToolboxPosition(Glib::ustring const& id, GtkPositionType pos)
+{
+    // Note - later on these won't be individual member variables.
+    GtkWidget* toolbox = nullptr;
+    if (id == "ToolToolbar") {
+        toolbox = tool_toolbox;
+    } else if (id == "AuxToolbar") {
+        toolbox = aux_toolbox;
+    } else if (id == "CommandsToolbar") {
+        toolbox = commands_toolbox;
+    } else if (id == "SnapToolbar") {
+        toolbox = snap_toolbox;
+    }
+
+
+    if (toolbox) {
+        switch(pos) {
+            case GTK_POS_TOP:
+            case GTK_POS_BOTTOM:
+                if ( gtk_widget_is_ancestor(toolbox, GTK_WIDGET(_hbox->gobj())) ) {
+                    // Removing a widget can reduce ref count to zero
+                    g_object_ref(G_OBJECT(toolbox));
+                    _hbox->remove(*Glib::wrap(toolbox));
+                    _vbox->add(*Glib::wrap(toolbox));
+                    g_object_unref(G_OBJECT(toolbox));
+
+                    // Function doesn't seem to be in Gtkmm wrapper yet
+                    gtk_box_set_child_packing(_vbox->gobj(), toolbox, FALSE, TRUE, 0, GTK_PACK_START);
+                }
+                ToolboxFactory::setOrientation(toolbox, GTK_ORIENTATION_HORIZONTAL);
+                break;
+            case GTK_POS_LEFT:
+            case GTK_POS_RIGHT:
+                if ( !gtk_widget_is_ancestor(toolbox, GTK_WIDGET(_hbox->gobj())) ) {
+                    g_object_ref(G_OBJECT(toolbox));
+                    _vbox->remove(*Glib::wrap(toolbox));
+                    _hbox->add(*Glib::wrap(toolbox));
+                    g_object_unref(G_OBJECT(toolbox));
+
+                    // Function doesn't seem to be in Gtkmm wrapper yet
+                    gtk_box_set_child_packing(_hbox->gobj(), toolbox, FALSE, TRUE, 0, GTK_PACK_START);
+                    if (pos == GTK_POS_LEFT) {
+                        _hbox->reorder_child(*Glib::wrap(toolbox), 0 );
+                    }
+                }
+                ToolboxFactory::setOrientation(toolbox, GTK_ORIENTATION_VERTICAL);
+                break;
+        }
+    }
+}
+
+
+SPDesktopWidget *sp_desktop_widget_new(SPDocument *document)
+{
+    SPDesktopWidget* dtw = SPDesktopWidget::createInstance(document);
+    return dtw;
+}
+
+SPDesktopWidget* SPDesktopWidget::createInstance(SPDocument *document)
+{
+    SPDesktopWidget *dtw = static_cast<SPDesktopWidget*>(g_object_new(SP_TYPE_DESKTOP_WIDGET, nullptr));
+
+    SPNamedView *namedview = sp_document_namedview(document, nullptr);
+
+    dtw->_dt2r = 1. / namedview->display_units->factor;
+
+    dtw->_ruler_origin = Geom::Point(0,0); //namedview->gridorigin;   Why was the grid origin used here?
+
+    dtw->desktop = new SPDesktop();
+    dtw->stub = new SPDesktopWidget::WidgetStub (dtw);
+    dtw->desktop->init (namedview, dtw->_canvas, dtw->stub);
+    INKSCAPE.add_desktop (dtw->desktop);
+
+    // Add the shape geometry to libavoid for autorouting connectors.
+    // This needs desktop set for its spacing preferences.
+    init_avoided_shape_geometry(dtw->desktop);
+
+    dtw->_selected_style->setDesktop(dtw->desktop);
+
+    /* Once desktop is set, we can update rulers */
+    dtw->update_rulers();
+
+    sp_view_widget_set_view (SP_VIEW_WIDGET (dtw), dtw->desktop);
+
+    /* Listen on namedview modification */
+    dtw->modified_connection = namedview->connectModified(sigc::mem_fun(*dtw, &SPDesktopWidget::namedviewModified));
+
+    dtw->layer_selector->setDesktop(dtw->desktop);
+
+    // TEMP
+    dtw->_menubar = build_menubar(dtw->desktop);
+    dtw->_menubar->set_name("MenuBar");
+    dtw->_menubar->show_all();
+
+#ifdef GDK_WINDOWING_QUARTZ
+    // native macOS menu: do this later because we don't have the window handle yet
+#else
+    dtw->_vbox->pack_start(*dtw->_menubar, false, false);
+#endif
+
+    dtw->layoutWidgets();
+
+    std::vector<GtkWidget *> toolboxes;
+    toolboxes.push_back(dtw->tool_toolbox);
+    toolboxes.push_back(dtw->aux_toolbox);
+    toolboxes.push_back(dtw->commands_toolbox);
+    toolboxes.push_back(dtw->snap_toolbox);
+
+    dtw->_panels->setDesktop( dtw->desktop );
+
+    UXManager::getInstance()->addTrack(dtw);
+    UXManager::getInstance()->connectToDesktop( toolboxes, dtw->desktop );
+
+    return dtw;
+}
+
+
+void
+SPDesktopWidget::update_rulers()
+{
+    Geom::Rect viewbox = desktop->get_display_area(true); 
+    // "true" means: Use integer values of the canvas for calculating the display area, similar
+    // to the integer values used for positioning the grid lines. (see SPCanvas::scrollTo(), 
+    // where ix and iy are rounded integer values; these values are stored in SPCanvasBuf->rect,
+    // and used for drawing the grid). By using the integer values here too, the ruler ticks 
+    // will be perfectly aligned to the grid
+
+    double lower_x = _dt2r * (viewbox.left()  - _ruler_origin[Geom::X]);
+    double upper_x = _dt2r * (viewbox.right() - _ruler_origin[Geom::X]);
+    _hruler->set_range(lower_x, upper_x);
+
+    double lower_y = _dt2r * (viewbox.bottom() - _ruler_origin[Geom::Y]);
+    double upper_y = _dt2r * (viewbox.top()    - _ruler_origin[Geom::Y]);
+    if (desktop->is_yaxisdown()) {
+        std::swap(lower_y, upper_y);
+    }
+    _vruler->set_range(lower_y, upper_y);
+}
+
+
+void SPDesktopWidget::namedviewModified(SPObject *obj, guint flags)
+{
+    SPNamedView *nv=SP_NAMEDVIEW(obj);
+
+    if (flags & SP_OBJECT_MODIFIED_FLAG) {
+        _dt2r = 1. / nv->display_units->factor;
+        _ruler_origin = Geom::Point(0,0); //nv->gridorigin;   Why was the grid origin used here?
+
+        _vruler->set_unit(nv->getDisplayUnit());
+        _hruler->set_unit(nv->getDisplayUnit());
+
+        /* This loops through all the grandchildren of aux toolbox,
+         * and for each that it finds, it performs an sp_search_by_data_recursive(),
+         * looking for widgets that hold some "tracker" data (this is used by
+         * all toolboxes to refer to the unit selector). The default document units
+         * is then selected within these unit selectors.
+         *
+         * Of course it would be nice to be able to refer to the toolbox and the
+         * unit selector directly by name, but I don't yet see a way to do that.
+         *
+         * This should solve: https://bugs.launchpad.net/inkscape/+bug/362995
+         */
+        if (GTK_IS_CONTAINER(aux_toolbox)) {
+            std::vector<Gtk::Widget*> ch = Glib::wrap(GTK_CONTAINER(aux_toolbox))->get_children();
+            for (auto i:ch) {
+                if (GTK_IS_CONTAINER(i->gobj())) {
+                    std::vector<Gtk::Widget*> grch = dynamic_cast<Gtk::Container*>(i)->get_children();
+                    for (auto j:grch) {
+
+                        if (!GTK_IS_WIDGET(j->gobj())) // wasn't a widget
+                            continue;
+
+                        // Don't apply to text toolbar. We want to be able to
+                        // use different units for text. (Bug 1562217)
+                        const Glib::ustring name = j->get_name();
+                        if ( name == "TextToolbar" || name == "MeasureToolbar")
+                            continue;
+
+                        gpointer t = sp_search_by_data_recursive(GTK_WIDGET(j->gobj()), (gpointer) "unit-tracker");
+                        if (t == nullptr) // didn't find any tracker data
+                            continue;
+
+                        UnitTracker *tracker = reinterpret_cast<UnitTracker*>( t );
+                        if (tracker == nullptr) // it's null when inkscape is first opened
+                            continue;
+
+                        tracker->setActiveUnit( nv->display_units );
+                    } // grandchildren
+                } // if child is a container
+            } // children
+        } // if aux_toolbox is a container
+
+        _hruler_box->set_tooltip_text(gettext(nv->display_units->name_plural.c_str()));
+        _vruler_box->set_tooltip_text(gettext(nv->display_units->name_plural.c_str()));
+
+        update_rulers();
+        ToolboxFactory::updateSnapToolbox(this->desktop, nullptr, this->snap_toolbox);
+    }
+}
+
+void
+SPDesktopWidget::on_adjustment_value_changed()
+{
+    if (update)
+        return;
+
+    update = 1;
+
+    // Do not call canvas->scrollTo directly... messes up 'offset'.
+    desktop->scroll_absolute( Geom::Point(_hadj->get_value(),
+                                          _vadj->get_value()), false);
+
+    update = 0;
+}
+
+/* we make the desktop window with focus active, signal is connected in interface.c */
+bool SPDesktopWidget::onFocusInEvent(GdkEventFocus*)
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    if (prefs->getBool("/options/bitmapautoreload/value", true)) {
+        std::vector<SPObject *> imageList = (desktop->doc())->getResourceList("image");
+        for (auto it : imageList) {
+            SPImage* image = SP_IMAGE(it);
+            image->refresh_if_outdated();
+        }
+    }
+
+    INKSCAPE.activate_desktop (desktop);
+
+    return false;
+}
+
+// ------------------------ Zoom ------------------------
+static gdouble
+sp_dtw_zoom_value_to_display (gdouble value)
+{
+    return floor (10 * (pow (2, value) * 100.0 + 0.05)) / 10;
+}
+
+static gdouble
+sp_dtw_zoom_display_to_value (gdouble value)
+{
+    return  log (value / 100.0) / log (2);
+}
+
+int
+SPDesktopWidget::zoom_input(double *new_val)
+{
+    gchar *b = g_strdup(_zoom_status->get_text().c_str());
+
+    gchar *comma = g_strstr_len (b, -1, ",");
+    if (comma) {
+        *comma = '.';
+    }
+
+    char *oldlocale = g_strdup (setlocale(LC_NUMERIC, nullptr));
+    setlocale (LC_NUMERIC, "C");
+    gdouble new_typed = atof (b);
+    setlocale (LC_NUMERIC, oldlocale);
+    g_free (oldlocale);
+    g_free (b);
+
+    *new_val = sp_dtw_zoom_display_to_value (new_typed);
+    return TRUE;
+}
+
+bool
+SPDesktopWidget::zoom_output()
+{
+    gchar b[64];
+    double val = sp_dtw_zoom_value_to_display (_zoom_status->get_value());
+    if (val < 10) {
+        g_snprintf (b, 64, "%4.1f%%", val);
+    } else {
+        g_snprintf (b, 64, "%4.0f%%", val);
+    }
+    _zoom_status->set_text(b);
+    return true;
+}
+
+void
+SPDesktopWidget::zoom_value_changed()
+{
+    double const zoom_factor = pow (2, _zoom_status->get_value());
+
+    // Zoom around center of window
+    Geom::Rect const d_canvas = desktop->getCanvas()->getViewbox();
+    Geom::Point midpoint = desktop->w2d(d_canvas.midpoint());
+    _zoom_status_value_changed_connection.block();
+    desktop->zoom_absolute_center_point (midpoint, zoom_factor);
+    _zoom_status_value_changed_connection.unblock();
+
+    spinbutton_defocus(GTK_WIDGET(_zoom_status->gobj()));
+}
+
+void
+SPDesktopWidget::zoom_menu_handler(double factor)
+{
+    Geom::Rect const d = desktop->get_display_area();
+    desktop->zoom_absolute_center_point (d.midpoint(), factor);
+}
+
+void
+SPDesktopWidget::zoom_populate_popup(Gtk::Menu *menu)
+{
+    for ( auto iter : menu->get_children()) {
+        menu->remove(*iter);
+    }
+
+    auto item_1000 = Gtk::manage(new Gtk::MenuItem("1000%"));
+    auto item_500  = Gtk::manage(new Gtk::MenuItem("500%"));
+    auto item_200  = Gtk::manage(new Gtk::MenuItem("200%"));
+    auto item_100  = Gtk::manage(new Gtk::MenuItem("100%"));
+    auto item_50   = Gtk::manage(new Gtk::MenuItem( "50%"));
+    auto item_25   = Gtk::manage(new Gtk::MenuItem( "25%"));
+    auto item_10   = Gtk::manage(new Gtk::MenuItem( "10%"));
+
+    item_1000->signal_activate().connect(sigc::bind(sigc::mem_fun(this, &SPDesktopWidget::zoom_menu_handler), 10.00));
+    item_500->signal_activate().connect( sigc::bind(sigc::mem_fun(this, &SPDesktopWidget::zoom_menu_handler),  5.00));
+    item_200->signal_activate().connect( sigc::bind(sigc::mem_fun(this, &SPDesktopWidget::zoom_menu_handler),  2.00));
+    item_100->signal_activate().connect( sigc::bind(sigc::mem_fun(this, &SPDesktopWidget::zoom_menu_handler),  1.00));
+    item_50->signal_activate().connect(  sigc::bind(sigc::mem_fun(this, &SPDesktopWidget::zoom_menu_handler),  0.50));
+    item_25->signal_activate().connect(  sigc::bind(sigc::mem_fun(this, &SPDesktopWidget::zoom_menu_handler),  0.25));
+    item_10->signal_activate().connect(  sigc::bind(sigc::mem_fun(this, &SPDesktopWidget::zoom_menu_handler),  0.10));
+
+    menu->append(*item_1000);
+    menu->append(*item_500);
+    menu->append(*item_200);
+    menu->append(*item_100);
+    menu->append(*item_50);
+    menu->append(*item_25);
+    menu->append(*item_10);
+
+    auto sep = Gtk::manage(new Gtk::SeparatorMenuItem());
+    menu->append(*sep);
+
+    auto item_page = Gtk::manage(new Gtk::MenuItem(_("Page")));
+    item_page->signal_activate().connect(sigc::mem_fun(desktop, &SPDesktop::zoom_page));
+    menu->append(*item_page);
+
+    auto item_drawing = Gtk::manage(new Gtk::MenuItem(_("Drawing")));
+    item_drawing->signal_activate().connect(sigc::mem_fun(desktop, &SPDesktop::zoom_drawing));
+    menu->append(*item_drawing);
+
+    auto item_selection = Gtk::manage(new Gtk::MenuItem(_("Selection")));
+    item_selection->signal_activate().connect(sigc::mem_fun(desktop, &SPDesktop::zoom_selection));
+    menu->append(*item_selection);
+
+    auto item_center_page = Gtk::manage(new Gtk::MenuItem(_("Centre Page")));
+    item_center_page->signal_activate().connect(sigc::mem_fun(desktop, &SPDesktop::zoom_center_page));
+    menu->append(*item_center_page);
+
+    menu->show_all();
+}
+
+
+void
+SPDesktopWidget::sticky_zoom_toggled()
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    prefs->setBool("/options/stickyzoom/value", _sticky_zoom->get_active());
+}
+
+
+void
+SPDesktopWidget::update_zoom()
+{
+    _zoom_status_value_changed_connection.block();
+    _zoom_status->set_value(log(desktop->current_zoom()) / log(2));
+    _zoom_status->queue_draw();
+    _zoom_status_value_changed_connection.unblock();
+}
+
+
+// ---------------------- Rotation ------------------------
+int
+SPDesktopWidget::rotation_input(double *new_val)
+{
+    auto *b = g_strdup(_rotation_status->get_text().c_str());
+
+    gchar *comma = g_strstr_len (b, -1, ",");
+    if (comma) {
+        *comma = '.';
+    }
+
+    char *oldlocale = g_strdup (setlocale(LC_NUMERIC, nullptr));
+    setlocale (LC_NUMERIC, "C");
+    gdouble new_value = atof (b);
+    setlocale (LC_NUMERIC, oldlocale);
+    g_free (oldlocale);
+    g_free (b);
+
+    *new_val = new_value;
+    return true;
+}
+
+bool
+SPDesktopWidget::rotation_output()
+{
+    gchar b[64];
+    double val = _rotation_status->get_value();
+
+    if (val < -180) val += 360;
+    if (val >  180) val -= 360;
+
+    g_snprintf (b, 64, "%7.2f°", val);
+
+    _rotation_status->set_text(b);
+    return true;
+}
+
+void
+SPDesktopWidget::rotation_value_changed()
+{
+    double const rotate_factor = M_PI / 180.0 * _rotation_status->get_value();
+    // std::cout << "SPDesktopWidget::rotation_value_changed: "
+    //           << _rotation_status->get_value()
+    //           << "  (" << rotate_factor << ")" <<std::endl;
+
+    // Rotate around center of window
+    Geom::Rect const d_canvas = desktop->getCanvas()->getViewbox();
+    _rotation_status_value_changed_connection.block();
+    Geom::Point midpoint = desktop->w2d(d_canvas.midpoint());
+    desktop->rotate_absolute_center_point (midpoint, rotate_factor);
+    _rotation_status_value_changed_connection.unblock();
+
+    spinbutton_defocus(GTK_WIDGET(_rotation_status->gobj()));
+}
+
+void
+SPDesktopWidget::rotation_populate_popup(Gtk::Menu *menu)
+{
+    for ( auto iter : menu->get_children()) {
+        menu->remove(*iter);
+    }
+
+    auto item_m135 = Gtk::manage(new Gtk::MenuItem("-135°"));
+    auto item_m90  = Gtk::manage(new Gtk::MenuItem( "-90°"));
+    auto item_m45  = Gtk::manage(new Gtk::MenuItem( "-45°"));
+    auto item_0    = Gtk::manage(new Gtk::MenuItem(   "0°"));
+    auto item_p45  = Gtk::manage(new Gtk::MenuItem(  "45°"));
+    auto item_p90  = Gtk::manage(new Gtk::MenuItem(  "90°"));
+    auto item_p135 = Gtk::manage(new Gtk::MenuItem( "135°"));
+    auto item_p180 = Gtk::manage(new Gtk::MenuItem( "180°"));
+
+    item_m135->signal_activate().connect(sigc::bind(sigc::mem_fun(_rotation_status, &Gtk::SpinButton::set_value), -135));
+    item_m90->signal_activate().connect( sigc::bind(sigc::mem_fun(_rotation_status, &Gtk::SpinButton::set_value), -90));
+    item_m45->signal_activate().connect( sigc::bind(sigc::mem_fun(_rotation_status, &Gtk::SpinButton::set_value), -45));
+    item_0->signal_activate().connect(   sigc::bind(sigc::mem_fun(_rotation_status, &Gtk::SpinButton::set_value),   0));
+    item_p45->signal_activate().connect( sigc::bind(sigc::mem_fun(_rotation_status, &Gtk::SpinButton::set_value),  45));
+    item_p90->signal_activate().connect( sigc::bind(sigc::mem_fun(_rotation_status, &Gtk::SpinButton::set_value),  90));
+    item_p135->signal_activate().connect(sigc::bind(sigc::mem_fun(_rotation_status, &Gtk::SpinButton::set_value), 135));
+    item_p180->signal_activate().connect(sigc::bind(sigc::mem_fun(_rotation_status, &Gtk::SpinButton::set_value), 180));
+
+    menu->append(*item_m135);
+    menu->append(*item_m90);
+    menu->append(*item_m45);
+    menu->append(*item_0);
+    menu->append(*item_p45);
+    menu->append(*item_p90);
+    menu->append(*item_p135);
+    menu->append(*item_p180);
+
+    menu->show_all();
+}
+
+
+void
+SPDesktopWidget::update_rotation()
+{
+    _rotation_status_value_changed_connection.block();
+    _rotation_status->set_value(desktop->current_rotation() / M_PI * 180.0);
+    _rotation_status->queue_draw();
+    _rotation_status_value_changed_connection.unblock();
+
+}
+
+
+// --------------- Rulers/Scrollbars/Etc. -----------------
+void
+SPDesktopWidget::toggle_rulers()
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    if (_guides_lock->get_visible()) {
+        _guides_lock->hide();
+        _hruler->hide();
+        _vruler->hide();
+        prefs->setBool(desktop->is_fullscreen() ? "/fullscreen/rulers/state" : "/window/rulers/state", false);
+    } else {
+        _guides_lock->show_all();
+        _hruler->show_all();
+        _vruler->show_all();
+        prefs->setBool(desktop->is_fullscreen() ? "/fullscreen/rulers/state" : "/window/rulers/state", true);
+    }
+}
+
+void
+SPDesktopWidget::toggle_scrollbars()
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    if (_hscrollbar->get_visible()) {
+        _hscrollbar->hide();
+        _vscrollbar_box->hide();
+        _cms_adjust->hide();
+        prefs->setBool(desktop->is_fullscreen() ? "/fullscreen/scrollbars/state" : "/window/scrollbars/state", false);
+    } else {
+        _hscrollbar->show_all();
+        _vscrollbar_box->show_all();
+        _cms_adjust->show_all();
+        prefs->setBool(desktop->is_fullscreen() ? "/fullscreen/scrollbars/state" : "/window/scrollbars/state", true);
+    }
+}
+
+bool
+SPDesktopWidget::get_color_prof_adj_enabled() const
+{
+    return _cms_adjust->get_sensitive() && _cms_adjust->get_active();
+}
+
+void
+SPDesktopWidget::toggle_color_prof_adj()
+{
+    if (_cms_adjust->get_sensitive()) {
+        if (_cms_adjust->get_active()) {
+            _cms_adjust->toggle_set_down(false);
+        } else {
+            _cms_adjust->toggle_set_down(true);
+        }
+    }
+}
+
+static void
+set_adjustment (Glib::RefPtr<Gtk::Adjustment> &adj, double l, double u, double ps, double si, double pi)
+{
+    if ((l != adj->get_lower()) ||
+        (u != adj->get_upper()) ||
+        (ps != adj->get_page_size()) ||
+        (si != adj->get_step_increment()) ||
+        (pi != adj->get_page_increment())) {
+	    adj->set_lower(l);
+	    adj->set_upper(u);
+	    adj->set_page_size(ps);
+	    adj->set_step_increment(si);
+	    adj->set_page_increment(pi);
+    }
+}
+
+void
+SPDesktopWidget::update_scrollbars(double scale)
+{
+    if (update) return;
+    update = 1;
+
+    /* The desktop region we always show unconditionally */
+    SPDocument *doc = desktop->doc();
+    Geom::Rect darea ( Geom::Point(-doc->getWidth().value("px"), -doc->getHeight().value("px")),
+                     Geom::Point(2 * doc->getWidth().value("px"), 2 * doc->getHeight().value("px"))  );
+
+    Geom::OptRect deskarea;
+    if (Inkscape::Preferences::get()->getInt("/tools/bounding_box") == 0) {
+        deskarea = darea | doc->getRoot()->desktopVisualBounds();
+    } else {
+        deskarea = darea | doc->getRoot()->desktopGeometricBounds();
+    }
+
+    /* Canvas region we always show unconditionally */
+    double const y_dir = desktop->yaxisdir();
+    Geom::Rect carea( Geom::Point(deskarea->left() * scale - 64, (deskarea->top() * scale + 64) * y_dir),
+                    Geom::Point(deskarea->right() * scale + 64, (deskarea->bottom() * scale - 64) * y_dir)  );
+
+    Geom::Rect viewbox = _canvas->getViewbox();
+
+    /* Viewbox is always included into scrollable region */
+    carea = Geom::unify(carea, viewbox);
+
+    set_adjustment(_hadj, carea.min()[Geom::X], carea.max()[Geom::X],
+                   viewbox.dimensions()[Geom::X],
+                   0.1 * viewbox.dimensions()[Geom::X],
+                   viewbox.dimensions()[Geom::X]);
+    _hadj->set_value(viewbox.min()[Geom::X]);
+
+    set_adjustment(_vadj, carea.min()[Geom::Y], carea.max()[Geom::Y],
+                   viewbox.dimensions()[Geom::Y],
+                   0.1 * viewbox.dimensions()[Geom::Y],
+                   viewbox.dimensions()[Geom::Y]);
+    _vadj->set_value(viewbox.min()[Geom::Y]);
+
+    update = 0;
+}
+
+bool
+SPDesktopWidget::get_sticky_zoom_active() const
+{
+    return _sticky_zoom->get_active();
+}
+
+double
+SPDesktopWidget::get_hruler_thickness() const
+{
+    auto allocation = _hruler->get_allocation();
+    return allocation.get_height();
+}
+
+double
+SPDesktopWidget::get_vruler_thickness() const
+{
+    auto allocation = _vruler->get_allocation();
+    return allocation.get_width();
+}
+
+gint
+SPDesktopWidget::ruler_event(GtkWidget *widget, GdkEvent *event, SPDesktopWidget *dtw, bool horiz)
+{
+    switch (event->type) {
+    case GDK_BUTTON_PRESS:
+        dtw->on_ruler_box_button_press_event(&event->button, Glib::wrap(GTK_EVENT_BOX(widget)), horiz);
+        break;
+    case GDK_MOTION_NOTIFY:
+        dtw->on_ruler_box_motion_notify_event(&event->motion, Glib::wrap(GTK_EVENT_BOX(widget)), horiz);
+        break;
+    case GDK_BUTTON_RELEASE:
+        dtw->on_ruler_box_button_release_event(&event->button, Glib::wrap(GTK_EVENT_BOX(widget)), horiz);
+        break;
+    default:
+            break;
+    }
+
+    return FALSE;
+}
+
+bool
+SPDesktopWidget::on_ruler_box_motion_notify_event(GdkEventMotion *event, Gtk::EventBox *widget, bool horiz)
+{
+    if (horiz) {
+        sp_event_context_snap_delay_handler(desktop->event_context, (gpointer) widget->gobj(), (gpointer) this, event, Inkscape::UI::Tools::DelayedSnapEvent::GUIDE_HRULER);
+    }
+    else {
+        sp_event_context_snap_delay_handler(desktop->event_context, (gpointer) widget->gobj(), (gpointer) this, event, Inkscape::UI::Tools::DelayedSnapEvent::GUIDE_VRULER);
+    }
+
+    int wx, wy;
+
+    GdkWindow *window = gtk_widget_get_window(GTK_WIDGET(_canvas));
+
+    gint width, height;
+
+    gdk_window_get_device_position(window, event->device, &wx, &wy, nullptr);
+    gdk_window_get_geometry(window, nullptr /*x*/, nullptr /*y*/, &width, &height);
+
+    Geom::Point const event_win(wx, wy);
+
+    if (_ruler_clicked) {
+        Geom::Point const event_w(sp_canvas_window_to_world(_canvas, event_win));
+        Geom::Point event_dt(desktop->w2d(event_w));
+
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        gint tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
+        if ( ( abs( (gint) event->x - _xp ) < tolerance )
+                && ( abs( (gint) event->y - _yp ) < tolerance ) ) {
+            return false;
+        }
+
+        _ruler_dragged = true;
+
+        // explicitly show guidelines; if I draw a guide, I want them on
+        if ((horiz ? wy : wx) >= 0) {
+            desktop->namedview->setGuides(true);
+        }
+
+        if (!(event->state & GDK_SHIFT_MASK)) {
+            ruler_snap_new_guide(desktop, _active_guide, event_dt, _normal);
+        }
+        sp_guideline_set_normal(SP_GUIDELINE(_active_guide), _normal);
+        sp_guideline_set_position(SP_GUIDELINE(_active_guide), event_dt);
+
+        desktop->set_coordinate_status(event_dt);
+    }
+
+    return false;
+}
+
+bool
+SPDesktopWidget::on_ruler_box_button_release_event(GdkEventButton *event, Gtk::EventBox *widget, bool horiz)
+{
+    int wx, wy;
+
+    GdkWindow *window = gtk_widget_get_window(GTK_WIDGET(_canvas));
+
+    gint width, height;
+
+    gdk_window_get_device_position(window, event->device, &wx, &wy, nullptr);
+    gdk_window_get_geometry(window, nullptr /*x*/, nullptr /*y*/, &width, &height);
+
+    Geom::Point const event_win(wx, wy);
+
+    if (_ruler_clicked && event->button == 1) {
+        sp_event_context_discard_delayed_snap_event(desktop->event_context);
+
+        auto seat = gdk_device_get_seat(event->device);
+        gdk_seat_ungrab(seat);
+
+        Geom::Point const event_w(sp_canvas_window_to_world(_canvas, event_win));
+        Geom::Point event_dt(desktop->w2d(event_w));
+
+        if (!(event->state & GDK_SHIFT_MASK)) {
+            ruler_snap_new_guide(desktop, _active_guide, event_dt, _normal);
+        }
+
+        sp_canvas_item_destroy(_active_guide);
+        _active_guide = nullptr;
+        if ((horiz ? wy : wx) >= 0) {
+            Inkscape::XML::Document *xml_doc = desktop->doc()->getReprDoc();
+            Inkscape::XML::Node *repr = xml_doc->createElement("sodipodi:guide");
+
+            // If root viewBox set, interpret guides in terms of viewBox (90/96)
+            double newx = event_dt.x();
+            double newy = event_dt.y();
+
+            // <sodipodi:guide> stores inverted y-axis coordinates
+            if (desktop->is_yaxisdown()) {
+                newy = desktop->doc()->getHeight().value("px") - newy;
+                _normal[Geom::Y] *= -1.0;
+            }
+
+            SPRoot *root = desktop->doc()->getRoot();
+            if( root->viewBox_set ) {
+                newx = newx * root->viewBox.width()  / root->width.computed;
+                newy = newy * root->viewBox.height() / root->height.computed;
+            }
+            sp_repr_set_point(repr, "position", Geom::Point( newx, newy ));
+            sp_repr_set_point(repr, "orientation", _normal);
+            desktop->namedview->appendChild(repr);
+            Inkscape::GC::release(repr);
+            DocumentUndo::done(desktop->getDocument(), SP_VERB_NONE,
+                    _("Create guide"));
+        }
+        desktop->set_coordinate_status(event_dt);
+
+        if (!_ruler_dragged) {
+            // Ruler click (without drag) toggle the guide visibility on and off
+            Inkscape::XML::Node *repr = desktop->namedview->getRepr();
+            sp_namedview_toggle_guides(desktop->getDocument(), desktop->namedview);
+        }
+
+        _ruler_clicked = false;
+        _ruler_dragged = false;
+    }
+
+    return false;
+}
+
+bool
+SPDesktopWidget::on_ruler_box_button_press_event(GdkEventButton *event, Gtk::EventBox *widget, bool horiz)
+{
+    if (_ruler_clicked) // event triggerred on a double click: do no process the click
+        return false;
+
+    int wx, wy;
+
+    GdkWindow *window = gtk_widget_get_window(GTK_WIDGET(_canvas));
+
+    gint width, height;
+
+    gdk_window_get_device_position(window, event->device, &wx, &wy, nullptr);
+    gdk_window_get_geometry(window, nullptr /*x*/, nullptr /*y*/, &width, &height);
+
+    Geom::Point const event_win(wx, wy);
+
+    if (event->button == 1) {
+        _ruler_clicked = true;
+        _ruler_dragged = false;
+        // save click origin
+        _xp = (gint) event->x;
+        _yp = (gint) event->y;
+
+        Geom::Point const event_w(sp_canvas_window_to_world(_canvas, event_win));
+        Geom::Point const event_dt(desktop->w2d(event_w));
+
+        // calculate the normal of the guidelines when dragged from the edges of rulers.
+        auto const y_dir = desktop->yaxisdir();
+        Geom::Point normal_bl_to_tr(1., y_dir); //bottomleft to topright
+        Geom::Point normal_tr_to_bl(-1., y_dir); //topright to bottomleft
+        normal_bl_to_tr.normalize();
+        normal_tr_to_bl.normalize();
+        Inkscape::CanvasGrid * grid = sp_namedview_get_first_enabled_grid(desktop->namedview);
+        if (grid){
+            if (grid->getGridType() == Inkscape::GRID_AXONOMETRIC ) {
+                Inkscape::CanvasAxonomGrid *axonomgrid = dynamic_cast<Inkscape::CanvasAxonomGrid *>(grid);
+                if (event->state & GDK_CONTROL_MASK) {
+                    // guidelines normal to gridlines
+                    normal_bl_to_tr = Geom::Point::polar(-axonomgrid->angle_rad[0], 1.0);
+                    normal_tr_to_bl = Geom::Point::polar(axonomgrid->angle_rad[2], 1.0);
+                } else {
+                    normal_bl_to_tr = rot90(Geom::Point::polar(axonomgrid->angle_rad[2], 1.0));
+                    normal_tr_to_bl = rot90(Geom::Point::polar(-axonomgrid->angle_rad[0], 1.0));
+                }
+            }
+        }
+        if (horiz) {
+            if (wx < 50) {
+                _normal = normal_bl_to_tr;
+            } else if (wx > width - 50) {
+                _normal = normal_tr_to_bl;
+            } else {
+                _normal = Geom::Point(0.,1.);
+            }
+        } else {
+            if (wy < 50) {
+                _normal = normal_bl_to_tr;
+            } else if (wy > height - 50) {
+                _normal = normal_tr_to_bl;
+            } else {
+                _normal = Geom::Point(1.,0.);
+            }
+        }
+
+        _active_guide = sp_guideline_new(desktop->guides, nullptr, event_dt, _normal);
+        sp_guideline_set_color(SP_GUIDELINE(_active_guide), desktop->namedview->guidehicolor);
+
+        auto window = widget->get_window()->gobj();
+
+        auto seat = gdk_device_get_seat(event->device);
+        gdk_seat_grab(seat,
+                window,
+                GDK_SEAT_CAPABILITY_ALL_POINTING,
+                FALSE,
+                nullptr,
+                (GdkEvent*)event,
+                nullptr,
+                nullptr);
+    }
+
+    return false;
+}
+
+GtkAllocation
+SPDesktopWidget::get_canvas_allocation() const
+{
+    GtkAllocation allocation;
+    gtk_widget_get_allocation(GTK_WIDGET(_canvas), &allocation);
+    return allocation;
+}
+
+void
+SPDesktopWidget::ruler_snap_new_guide(SPDesktop *desktop, SPCanvasItem * /*guide*/, Geom::Point &event_dt, Geom::Point &normal)
+{
+    SnapManager &m = desktop->namedview->snap_manager;
+    m.setup(desktop);
+    // We're dragging a brand new guide, just pulled of the rulers seconds ago. When snapping to a
+    // path this guide will change it slope to become either tangential or perpendicular to that path. It's
+    // therefore not useful to try tangential or perpendicular snapping, so this will be disabled temporarily
+    bool pref_perp = m.snapprefs.getSnapPerp();
+    bool pref_tang = m.snapprefs.getSnapTang();
+    m.snapprefs.setSnapPerp(false);
+    m.snapprefs.setSnapTang(false);
+    // We only have a temporary guide which is not stored in our document yet.
+    // Because the guide snapper only looks in the document for guides to snap to,
+    // we don't have to worry about a guide snapping to itself here
+    Geom::Point normal_orig = normal;
+    m.guideFreeSnap(event_dt, normal, false, false);
+    // After snapping, both event_dt and normal have been modified accordingly; we'll take the normal (of the
+    // curve we snapped to) to set the normal the guide. And rotate it by 90 deg. if needed
+    if (pref_perp) { // Perpendicular snapping to paths is requested by the user, so let's do that
+        if (normal != normal_orig) {
+            normal = Geom::rot90(normal);
+        }
+    }
+    if (!(pref_tang || pref_perp)) { // if we don't want to snap either perpendicularly or tangentially, then
+        normal = normal_orig; // we must restore the normal to it's original state
+    }
+    // Restore the preferences
+    m.snapprefs.setSnapPerp(pref_perp);
+    m.snapprefs.setSnapTang(pref_tang);
+    m.unSetup();
+}
+
+/*
+  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 :