Adding upstream version 1.2.2.upstream/1.2.2upstream

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

1 files changed, 2012 insertions, 0 deletions

diff --git a/src/widgets/desktop-widget.cpp b/src/widgets/desktop-widget.cpp
new file mode 100644
index 0000000..7cfa223
--- /dev/null
+++ b/src/widgets/desktop-widget.cpp
@@ -0,0 +1,2012 @@
+// 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 "enums.h"
+#include "file.h"
+#include "inkscape-application.h"
+#include "inkscape-window.h"
+#include "inkscape-version.h"
+
+#include "display/control/canvas-axonomgrid.h"
+#include "display/control/canvas-item-drawing.h"
+#include "display/control/canvas-item-guideline.h"
+
+#include "extension/db.h"
+
+#include "object/sp-image.h"
+#include "object/sp-namedview.h"
+#include "object/sp-root.h"
+
+#include "ui/shortcuts.h"
+#include "ui/dialog/swatches.h"
+#include "ui/icon-loader.h"
+#include "ui/icon-names.h"
+#include "ui/monitor.h"   // Monitor aspect ratio
+#include "ui/dialog/dialog-container.h"
+#include "ui/dialog/dialog-multipaned.h"
+#include "ui/dialog/dialog-window.h"
+#include "ui/tools/box3d-tool.h"
+#include "ui/tools/text-tool.h"
+#include "ui/util.h"
+#include "ui/widget/canvas.h"
+#include "ui/widget/canvas-grid.h"
+#include "ui/widget/combo-tool-item.h"
+#include "ui/widget/ink-ruler.h"
+#include "ui/widget/layer-selector.h"
+#include "ui/widget/page-selector.h"
+#include "ui/widget/selected-style.h"
+#include "ui/widget/spin-button-tool-item.h"
+#include "ui/widget/unit-tracker.h"
+#include "ui/themes.h"
+
+#include "util/units.h"
+
+// We're in the "widgets" directory, so no need to explicitly prefix these:
+#include "spw-utilities.h"
+#include "toolbox.h"
+#include "widget-sizes.h"
+
+#include "ui/widget/color-palette.h"
+#include "ui/widget/preview.h"
+#include "ui/dialog/color-item.h"
+#include "widgets/ege-paint-def.h"
+
+using Inkscape::DocumentUndo;
+using Inkscape::UI::Dialog::DialogContainer;
+using Inkscape::UI::Dialog::DialogMultipaned;
+using Inkscape::UI::Dialog::DialogWindow;
+using Inkscape::UI::Widget::UnitTracker;
+using Inkscape::UI::ToolboxFactory;
+using Inkscape::Util::unit_table;
+
+
+//---------------------------------------------------------------------
+/* SPDesktopWidget */
+
+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;
+};
+
+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 );
+}
+
+void CMSPrefWatcher::_refreshAll()
+{
+    for (auto & it : _widget_list) {
+        it->requestCanvasUpdate();
+    }
+}
+
+void CMSPrefWatcher::_setCmsSensitive(bool enabled)
+{
+    for ( auto dtw : _widget_list ) {
+        auto cms_adj = dtw->get_canvas_grid()->GetCmsAdjust();
+        if ( cms_adj->get_sensitive() != enabled ) {
+            dtw->cms_adjust_set_sensitive(enabled);
+        }
+    }
+}
+
+static CMSPrefWatcher* watcher = nullptr;
+
+SPDesktopWidget::SPDesktopWidget(InkscapeWindow* inkscape_window)
+    : window (inkscape_window)
+{
+    auto *const dtw = this;
+
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+    /* Main table */
+    dtw->_vbox = Gtk::manage(new Gtk::Box(Gtk::ORIENTATION_VERTICAL));
+    dtw->_vbox->set_name("DesktopMainTable");
+    dtw->add(*dtw->_vbox);
+
+    /* Status bar */
+    dtw->_statusbar = Gtk::manage(new Gtk::Box());
+    dtw->_statusbar->set_name("DesktopStatusBar");
+    dtw->_vbox->pack_end(*dtw->_statusbar, false, true);
+
+    /* Swatch Bar */
+    dtw->_panels = Gtk::manage(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->_tbbox = Gtk::manage(new Gtk::Paned(Gtk::ORIENTATION_HORIZONTAL));
+    dtw->_tbbox->set_name("ToolboxCanvasPaned");
+    dtw->_hbox->pack_start(*dtw->_tbbox, true, true);
+
+    dtw->_vbox->pack_end(*dtw->_hbox, true, true);
+
+    dtw->_top_toolbars = Gtk::make_managed<Gtk::Grid>();
+    dtw->_top_toolbars->set_name("TopToolbars");
+    dtw->_vbox->pack_end(*dtw->_top_toolbars, false, true);
+
+    /* Toolboxes */
+    dtw->aux_toolbox = ToolboxFactory::createAuxToolbox();
+
+    dtw->snap_toolbox = ToolboxFactory::createSnapToolbox();
+    ToolboxFactory::setOrientation(dtw->snap_toolbox, GTK_ORIENTATION_HORIZONTAL);
+    dtw->_top_toolbars->attach(*Glib::wrap(dtw->snap_toolbox), 1, 0, 1, 2);
+
+    dtw->commands_toolbox = ToolboxFactory::createCommandsToolbox();
+    auto cmd = Glib::wrap(dtw->commands_toolbox);
+    dtw->_top_toolbars->attach(*cmd, 0, 0);
+
+    dtw->_top_toolbars->attach(*Glib::wrap(dtw->aux_toolbox), 0, 1);
+
+    dtw->tool_toolbox = ToolboxFactory::createToolToolbox(inkscape_window);
+    ToolboxFactory::setOrientation( dtw->tool_toolbox, GTK_ORIENTATION_VERTICAL );
+    dtw->_tbbox->pack1(*Glib::wrap(dtw->tool_toolbox), false, true);
+    auto tbox_width = prefs->getEntry("/toolbox/tools/width");
+    if (tbox_width.isValid()) {
+        _tbbox->set_position(tbox_width.getIntLimited(32, 8, 500));
+    }
+
+    auto set_visible_buttons = [=](GtkWidget* tb) {
+        int buttons_before_separator = 0;
+        Gtk::Widget* last_sep = nullptr;
+        Gtk::FlowBox* last_box = nullptr;
+        sp_traverse_widget_tree(Glib::wrap(tb), [&](Gtk::Widget* widget) {
+            if (auto flowbox = dynamic_cast<Gtk::FlowBox*>(widget)) {
+                flowbox->show();
+                flowbox->set_no_show_all();
+                flowbox->set_max_children_per_line(1);
+                last_box = flowbox;
+            }
+            else if (auto btn = dynamic_cast<Gtk::Button*>(widget)) {
+                auto name = sp_get_action_target(widget);
+                auto show = prefs->getBool(ToolboxFactory::get_tool_visible_buttons_path(name), true);
+                auto parent = btn->get_parent();
+                if (show) {
+                    parent->show();
+                    ++buttons_before_separator;
+                    // keep the max_children up to date improves display.
+                    last_box->set_max_children_per_line(buttons_before_separator);
+                    last_sep = nullptr;
+                }
+                else {
+                    parent->hide();
+                }
+            }
+            else if (auto sep = dynamic_cast<Gtk::Separator*>(widget)) {
+                if (buttons_before_separator <= 0) {
+                    sep->hide();
+                }
+                else {
+                    sep->show();
+                    buttons_before_separator = 0;
+                    last_sep = sep;
+                }
+            }
+            return false;
+        });
+        if (last_sep) {
+            // hide trailing separator
+            last_sep->hide();
+        }
+    };
+    auto set_toolbar_prefs = [=]() {
+        int min = ToolboxFactory::min_pixel_size;
+        int max = ToolboxFactory::max_pixel_size;
+        int s = prefs->getIntLimited(ToolboxFactory::tools_icon_size, min, min, max);
+        ToolboxFactory::set_icon_size(tool_toolbox, s);
+    };
+
+    // watch for changes
+    _tb_icon_sizes1 = prefs->createObserver(ToolboxFactory::tools_icon_size,    [=]() { set_toolbar_prefs(); });
+    _tb_icon_sizes2 = prefs->createObserver(ToolboxFactory::ctrlbars_icon_size, [=]() { apply_ctrlbar_settings(); });
+    _tb_visible_buttons = prefs->createObserver(ToolboxFactory::tools_visible_buttons, [=]() { set_visible_buttons(tool_toolbox); });
+
+    // restore preferences
+    set_toolbar_prefs();
+    apply_ctrlbar_settings();
+    set_visible_buttons(tool_toolbox);
+
+    /* Canvas Grid (canvas, rulers, scrollbars, etc.) */
+    // desktop widgets owns it
+    _canvas_grid = new Inkscape::UI::Widget::CanvasGrid(this);
+
+    /* Canvas */
+    dtw->_canvas = _canvas_grid->GetCanvas();
+
+    dtw->_canvas->set_cms_active(prefs->getBool("/options/displayprofile/enable"));
+
+    /* Dialog Container */
+    _container = Gtk::manage(new DialogContainer(inkscape_window));
+    _columns = _container->get_columns();
+    _columns->set_dropzone_sizes(2, -1);
+    dtw->_tbbox->pack2(*_container, true, true);
+
+    _canvas_grid->set_hexpand(true);
+    _canvas_grid->set_vexpand(true);
+    _columns->append(_canvas_grid);
+
+    // --------------- Status Tool Bar ------------------//
+
+    // Selected Style (Fill/Stroke/Opacity)
+    dtw->_selected_style = Gtk::manage(new Inkscape::UI::Widget::SelectedStyle(true));
+    dtw->_statusbar->pack_start(*dtw->_selected_style, false, false);
+    _selected_style->show_all();
+    _selected_style->set_no_show_all();
+
+    // Layer Selector
+    _layer_selector = Gtk::manage(new Inkscape::UI::Widget::LayerSelector(nullptr));
+    // separate layer selector buttons from status text
+    auto vseparator = Gtk::make_managed<Gtk::Separator>(Gtk::ORIENTATION_VERTICAL);
+    vseparator->set_margin_end(6);
+    vseparator->set_margin_top(6);
+    vseparator->set_margin_bottom(6);
+    _layer_selector->pack_end(*vseparator);
+    _layer_selector->show_all();
+    _layer_selector->set_no_show_all();
+    dtw->_statusbar->pack_start(*_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);
+
+    dtw->_zoom_status_box = Gtk::make_managed<Gtk::Box>();
+    // 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 Inkscape::UI::Widget::SpinButton(zoom_adj));
+
+    dtw->_zoom_status->set_defocus_widget(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));
+    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);
+
+    dtw->_rotation_status_box = Gtk::make_managed<Gtk::Box>();
+    dtw->_rotation_status_box->set_margin_start(10);
+    // Rotate status spinbutton ---------------
+    auto rotation_adj = Gtk::Adjustment::create(0, -360.0, 360.0, 1.0);
+
+    dtw->_rotation_status = Gtk::manage(new Inkscape::UI::Widget::SpinButton(rotation_adj));
+
+    // FIXME: This is a bit of a hack, to avoid the ExpressionEvaluator struggling to parse the
+    //        degree symbol.  It would be better to improve ExpressionEvaluator so it copes
+    dtw->_rotation_status->set_dont_evaluate(true);
+
+    dtw->_rotation_status->set_defocus_widget(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_output_connection = dtw->_rotation_status->signal_output().connect(sigc::mem_fun(dtw, &SPDesktopWidget::rotation_output));
+    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 ");
+
+    // TRANSLATORS: Abbreviation for canvas zoom level
+    auto label_z = Gtk::manage(new Gtk::Label(C_("canvas", "Z:")));
+    label_z->set_name("ZLabel");
+    // TRANSLATORS: Abbreviation for canvas rotation
+    auto label_r = Gtk::manage(new Gtk::Label(C_("canvas", "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->show_all();
+    dtw->_coord_status->set_no_show_all();
+
+    dtw->_zoom_status_box->pack_start(*label_z, true, true);
+    dtw->_zoom_status_box->pack_end(*dtw->_zoom_status, true, true);
+    dtw->_zoom_status_box->show_all();
+
+    dtw->_rotation_status_box->pack_start(*label_r, true, true);
+    dtw->_rotation_status_box->pack_end(*dtw->_rotation_status, true, true);
+    dtw->_rotation_status_box->show_all();
+    dtw->_rotation_status_box->set_no_show_all();
+
+    dtw->_statusbar->pack_end(*dtw->_rotation_status_box, false, false);
+    dtw->_statusbar->pack_end(*dtw->_zoom_status_box, false, false);
+    dtw->_statusbar->pack_end(*dtw->_coord_status, false, false);
+
+    update_statusbar_visibility();
+
+    _statusbar_preferences_observer = prefs->createObserver("/statusbar/visibility", [=]() {
+        update_statusbar_visibility();
+    });
+
+    // --------------- Color Management ---------------- //
+    dtw->_tracker = ege_color_prof_tracker_new(GTK_WIDGET(_layer_selector->gobj()));
+    bool fromDisplay = prefs->getBool( "/options/displayprofile/from_display");
+    if ( fromDisplay ) {
+        auto id = Inkscape::CMSSystem::getDisplayId(0);
+        dtw->_canvas->set_cms_key(id);
+        dtw->cms_adjust_set_sensitive(!id.empty());
+    }
+    g_signal_connect( G_OBJECT(dtw->_tracker), "changed", G_CALLBACK(SPDesktopWidget::color_profile_event), dtw );
+
+    // ------------------ Finish Up -------------------- //
+    dtw->_vbox->show_all();
+    dtw->_canvas_grid->ShowCommandPalette(false);
+
+    dtw->_canvas->grab_focus();
+}
+
+void SPDesktopWidget::apply_ctrlbar_settings() {
+    Inkscape::Preferences* prefs = Inkscape::Preferences::get();
+    int min = ToolboxFactory::min_pixel_size;
+    int max = ToolboxFactory::max_pixel_size;
+    int size = prefs->getIntLimited(ToolboxFactory::ctrlbars_icon_size, min, min, max);
+    ToolboxFactory::set_icon_size(snap_toolbox, size);
+    ToolboxFactory::set_icon_size(commands_toolbox, size);
+    ToolboxFactory::set_icon_size(aux_toolbox, size);
+}
+
+void SPDesktopWidget::update_statusbar_visibility() {
+    auto prefs = Inkscape::Preferences::get();
+    Glib::ustring path("/statusbar/visibility/");
+
+    _coord_status->set_visible(prefs->getBool(path + "coordinates", true));
+    _rotation_status_box->set_visible(prefs->getBool(path + "rotation", true));
+    _layer_selector->set_visible(prefs->getBool(path + "layer", true));
+    _selected_style->set_visible(prefs->getBool(path + "style", true));
+}
+
+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 = _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);
+}
+
+/**
+ * Called before SPDesktopWidget destruction.
+ * (Might be called more than once)
+ */
+void
+SPDesktopWidget::on_unrealize()
+{
+    auto dtw = this;
+
+    if (_tbbox) {
+        Inkscape::Preferences::get()->setInt("/toolbox/tools/width", _tbbox->get_position());
+    }
+
+    if (dtw->desktop) {
+        if ( watcher ) {
+            watcher->remove(dtw);
+        }
+
+        for (auto &conn : dtw->_connections) {
+            conn.disconnect();
+        }
+
+        // Canvas
+        dtw->_canvas->set_drawing(nullptr); // Ensures deactivation
+        dtw->_canvas->set_desktop(nullptr); // Todo: Remove desktop dependency.
+
+        // Zoom
+        dtw->_zoom_status_input_connection.disconnect();
+        dtw->_zoom_status_output_connection.disconnect();
+        g_signal_handlers_disconnect_by_data(G_OBJECT(dtw->_zoom_status->gobj()), dtw->_zoom_status->gobj());
+        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_by_data(G_OBJECT(dtw->_rotation_status->gobj()), dtw->_rotation_status->gobj());
+        dtw->_rotation_status_value_changed_connection.disconnect();
+        dtw->_rotation_status_populate_popup_connection.disconnect();
+
+        dtw->_panels->setDesktop(nullptr);
+
+        delete _container; // will unrealize dtw->_canvas
+
+        _layer_selector->setDesktop(nullptr);
+        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;
+    }
+
+    parent_type::on_unrealize();
+}
+
+SPDesktopWidget::~SPDesktopWidget() {
+    delete _canvas_grid;
+}
+
+/**
+ * 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();
+        auto namedview = doc->getNamedView();
+
+        std::string Name;
+        if (doc->isModifiedSinceSave()) {
+            Name += "*";
+        }
+
+        Name += uri;
+
+        if (namedview->viewcount > 1) {
+            Name += ": ";
+            Name += std::to_string(namedview->viewcount);
+        }
+        Name += " (";
+
+        auto render_mode = desktop->getCanvas()->get_render_mode();
+        auto color_mode  = desktop->getCanvas()->get_color_mode();
+
+        if (render_mode == Inkscape::RenderMode::OUTLINE) {
+            Name += N_("outline");
+        } else if (render_mode == Inkscape::RenderMode::NO_FILTERS) {
+            Name += N_("no filters");
+        } else if (render_mode == Inkscape::RenderMode::VISIBLE_HAIRLINES) {
+            Name += N_("visible hairlines");
+        } else if (render_mode == Inkscape::RenderMode::OUTLINE_OVERLAY) {
+            Name += N_("outline overlay");
+        }
+
+        if (color_mode != Inkscape::ColorMode::NORMAL &&
+            render_mode != Inkscape::RenderMode::NORMAL) {
+                Name += ", ";
+        }
+
+        if (color_mode == Inkscape::ColorMode::GRAYSCALE) {
+            Name += N_("grayscale");
+        } else if (color_mode == 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);
+    }
+}
+
+DialogContainer *SPDesktopWidget::getDialogContainer()
+{
+    return _container;
+}
+
+/**
+ * Resize handler, keeps the desktop centered.
+ */
+void SPDesktopWidget::on_size_allocate(Gtk::Allocation &allocation)
+{
+    // This function is called a lot during mouse move events without
+    // resizing the widget. Desktop position/zoom must not be updated
+    // for these trivial invocations.
+    if (allocation == get_allocation()) {
+        parent_type::on_size_allocate(allocation);
+        return;
+    }
+
+    Geom::Rect const d_canvas = _canvas->get_area_world();
+
+    parent_type::on_size_allocate(allocation);
+
+    if (d_canvas.hasZeroArea()) {
+        return;
+    }
+
+    Geom::Point const midpoint_dt = desktop->w2d(d_canvas.midpoint());
+    double zoom = desktop->current_zoom();
+
+    if (_canvas_grid->GetStickyZoom()->get_active()) {
+        /* Calculate adjusted zoom */
+        double oldshortside = d_canvas.minExtent();
+        double newshortside = _canvas->get_area_world().minExtent();
+        zoom *= newshortside / oldshortside;
+    }
+
+    desktop->zoom_absolute(midpoint_dt, zoom, false);
+}
+
+/**
+ * Callback to realize desktop widget.
+ */
+void SPDesktopWidget::on_realize()
+{
+    SPDesktopWidget *dtw = this;
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+    parent_type::on_realize();
+
+    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::Container *window = get_toplevel();
+    if (settings && window) {
+        g_object_get(settings, "gtk-theme-name", &gtkThemeName, nullptr);
+        g_object_get(settings, "gtk-application-prefer-dark-theme", &gtkApplicationPreferDarkTheme, nullptr);
+        bool dark = INKSCAPE.themecontext->isCurrentThemeDark(dynamic_cast<Gtk::Container *>(window));
+        if (dark) {
+            prefs->setBool("/theme/darkTheme", true);
+            window->get_style_context()->add_class("dark");
+            window->get_style_context()->remove_class("bright");
+        } else {
+            prefs->setBool("/theme/darkTheme", false);
+            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.themecontext->getChangeThemeSignal().emit();
+    }
+}
+
+/* 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
+        dtw->_canvas->grab_focus();
+    }
+
+    if ((event->type == GDK_BUTTON_PRESS) && (event->button.button == 3)) {
+        if (event->button.state & GDK_SHIFT_MASK) {
+            dtw->desktop->getCanvasDrawing()->set_sticky(true);
+        } else {
+            dtw->desktop->getCanvasDrawing()->set_sticky(false);
+        }
+    }
+
+    {
+        // 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->get_current_canvas_item()) {
+            return (gint)sp_desktop_root_handler (event, dtw->desktop);
+        }
+    }
+
+    return FALSE;
+}
+
+void
+SPDesktopWidget::color_profile_event(EgeColorProfTracker */*tracker*/, SPDesktopWidget *dtw)
+{
+    // Handle profile changes
+    GdkWindow *window = dtw->get_window()->gobj();
+
+    // 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 );
+    dtw->_canvas->set_cms_key(id);
+    dtw->requestCanvasUpdate();
+    dtw->cms_adjust_set_sensitive(!id.empty());
+}
+
+void
+SPDesktopWidget::update_guides_lock()
+{
+    bool down = _canvas_grid->GetGuideLock()->get_active();
+    auto nv   = desktop->getNamedView();
+    bool lock = nv->getLockGuides();
+
+    if (down != lock) {
+        nv->toggleLockGuides();
+        if (down) {
+            setMessage (Inkscape::NORMAL_MESSAGE, _("Locked all guides"));
+        } else {
+            setMessage (Inkscape::NORMAL_MESSAGE, _("Unlocked all guides"));
+        }
+    }
+}
+
+void
+SPDesktopWidget::cms_adjust_toggled()
+{
+    auto _cms_adjust = _canvas_grid->GetCmsAdjust();
+
+    bool down = _cms_adjust->get_active();
+    if ( down != _canvas->get_cms_active() ) {
+        _canvas->set_cms_active(down);
+        desktop->redrawDesktop();
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        prefs->setBool("/options/displayprofile/enable", down);
+        if (down) {
+            setMessage (Inkscape::NORMAL_MESSAGE, _("Color-managed display is <b>enabled</b> in this window"));
+        } else {
+            setMessage (Inkscape::NORMAL_MESSAGE, _("Color-managed display is <b>disabled</b> in this window"));
+        }
+    }
+}
+
+void
+SPDesktopWidget::cms_adjust_set_sensitive(bool enabled)
+{
+    _canvas_grid->GetCmsAdjust()->set_sensitive(enabled);
+}
+
+/**
+ * \pre this->desktop->main != 0
+ */
+void
+SPDesktopWidget::requestCanvasUpdate() {
+    // ^^ also this->desktop != 0
+    g_return_if_fail(this->desktop != nullptr);
+    desktop->getCanvas()->queue_draw();
+}
+
+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) {
+    this->set_sensitive();
+  }
+}
+
+void
+SPDesktopWidget::disableInteraction()
+{
+  if (_interaction_disabled_counter == 0) {
+    this->set_sensitive(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);
+        // The get_positon is very unreliable (see Gtk docs) and will often return zero.
+        if (!x && !y) {
+            if (Glib::RefPtr<Gdk::Window> w = window->get_window()) {
+                Gdk::Rectangle rect;
+                w->get_frame_extents(rect);
+                x = rect.get_x();
+                y = rect.get_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);
+    }
+}
+
+/**
+ * \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());
+        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 == PREFS_DIALOGS_WINDOWS_AGGRESSIVE)
+            // without this, a transient window not always emerges on top
+            gtk_window_present (w);
+    }
+}
+
+void
+SPDesktopWidget::presentWindow()
+{
+    if (window)
+        window->present();
+}
+
+bool SPDesktopWidget::showInfoDialog( Glib::ustring const &message )
+{
+    bool result = false;
+    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->gobj())));
+    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->gobj())));
+    if (GTK_IS_WINDOW(topw)) {
+        if (desktop->is_maximized()) {
+            gtk_window_unmaximize(topw);
+        } else {
+            gtk_window_maximize(topw);
+        }
+    }
+}
+
+void
+SPDesktopWidget::fullscreen()
+{
+    GtkWindow *topw = GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(_canvas->gobj())));
+    if (GTK_IS_WINDOW(topw)) {
+        if (desktop->is_fullscreen()) {
+            gtk_window_unfullscreen(topw);
+            // widget layout is triggered by the resulting window_state_event
+        } else {
+            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.
+ * Also move command toolbar to top or side as required.
+ */
+void SPDesktopWidget::layoutWidgets()
+{
+    SPDesktopWidget *dtw = this;
+    Glib::ustring pref_root;
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+    if (desktop && desktop->is_focusMode()) {
+        pref_root = "/focus/";
+    } else if (desktop && 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();
+    }
+
+    _canvas_grid->ShowScrollbars(prefs->getBool(pref_root + "scrollbars/state", true));
+    _canvas_grid->ShowRulers(    prefs->getBool(pref_root + "rulers/state",     true));
+
+    // Move command toolbar as required.
+
+    // If interface_mode unset, use screen aspect ratio. Needs to be synced with "canvas-interface-mode" action.
+    Gdk::Rectangle monitor_geometry = Inkscape::UI::get_monitor_geometry_primary();
+    double const width  = monitor_geometry.get_width();
+    double const height = monitor_geometry.get_height();
+    bool widescreen = (height > 0 && width/height > 1.65);
+    widescreen = prefs->getInt(pref_root + "task/taskset", widescreen ? 2 : 0) == 2; // legacy
+    widescreen = prefs->getBool(pref_root + "interface_mode", widescreen);
+
+    auto commands_toolbox_cpp = dynamic_cast<Gtk::Bin *>(Glib::wrap(commands_toolbox));
+    if (commands_toolbox_cpp) {
+
+        // Unlink command toolbar.
+        commands_toolbox_cpp->reference(); // So toolbox is not deleted.
+        auto parent = commands_toolbox_cpp->get_parent();
+        parent->remove(*commands_toolbox_cpp);
+
+        auto orientation = Gtk::ORIENTATION_HORIZONTAL;
+        auto orientation_c = GTK_ORIENTATION_HORIZONTAL;
+        // Link command toolbar back.
+        if (!widescreen) {
+            _top_toolbars->attach(*commands_toolbox_cpp, 0, 0); // Always first
+            gtk_box_set_child_packing(_vbox->gobj(), commands_toolbox, false, true, 0, GTK_PACK_START); // expand, fill, padding, pack_type
+            orientation = Gtk::ORIENTATION_HORIZONTAL;
+            orientation_c = GTK_ORIENTATION_HORIZONTAL;
+            commands_toolbox_cpp->set_hexpand(true);
+        } else {
+            _hbox->add(*commands_toolbox_cpp);
+            gtk_box_set_child_packing(_hbox->gobj(), commands_toolbox, false, true, 0, GTK_PACK_START); // expand, fill, padding, pack_type
+            orientation = Gtk::ORIENTATION_VERTICAL;
+            orientation_c = GTK_ORIENTATION_VERTICAL;
+            commands_toolbox_cpp->set_hexpand(false);
+        }
+        commands_toolbox_cpp->unreference();
+
+        auto box = dynamic_cast<Gtk::Box *>(commands_toolbox_cpp->get_child());
+        if (box) {
+            box->set_orientation(orientation);
+            for (auto child : box->get_children()) {
+                if (auto toolbar = dynamic_cast<Gtk::Toolbar *>(child)) {
+                    gtk_orientable_set_orientation(GTK_ORIENTABLE(toolbar->gobj()), orientation_c);
+                    //toolbar->set_orientation(orientation); // Missing in C++ interface!
+                }
+            }
+        }
+    } else {
+        std::cerr << "SPDesktopWidget::layoutWidgets(): Wrong widget type for command toolbar!" << std::endl;
+    }
+
+    // Temporary for Gtk3: Gtk toolbar resets icon sizes, so reapply them.
+    // TODO: remove this call in Gtk4 after Gtk::Toolbar is eliminated.
+    apply_ctrlbar_settings();
+
+    auto& snap = *Glib::wrap(snap_toolbox);
+    auto& aux = *Glib::wrap(aux_toolbox);
+
+    // This ensures that the Snap toolbox is on the top and only takes the needed space.
+    if (_top_toolbars->get_children().size() == 3 && gtk_widget_get_visible(commands_toolbox)) {
+        _top_toolbars->child_property_height(snap) =  1;
+        _top_toolbars->child_property_width(aux) = 2;
+        snap.set_valign(Gtk::ALIGN_START);
+    }
+    else {
+        _top_toolbars->child_property_width(aux) = 1;
+        _top_toolbars->child_property_height(snap) =  2;
+        snap.set_valign(Gtk::ALIGN_CENTER);
+    }
+
+    Inkscape::UI::resize_widget_children(_top_toolbars);
+}
+
+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;
+    auto thing = sp_search_by_name_recursive(Glib::wrap(aux_toolbox), id);
+
+    // The toolbutton could be a few different types so try casting to
+    // each of them.
+    // TODO: This will be simpler in Gtk+ 4 when ToolItems have gone
+    auto toggle_button      = dynamic_cast<Gtk::ToggleButton *>(thing);
+    auto toggle_tool_button = dynamic_cast<Gtk::ToggleToolButton *>(thing);
+
+    if ( !thing ) {
+        //g_message( "Unable to locate item for {%s}", id );
+    } else if (toggle_button) {
+        isActive = toggle_button->get_active();
+    } else if (toggle_tool_button) {
+        isActive = toggle_tool_button->get_active();
+    } else {
+        //g_message( "Item for {%s} is of an unsupported type", id );
+    }
+
+    return isActive;
+}
+
+SPDesktopWidget::SPDesktopWidget(InkscapeWindow *inkscape_window, SPDocument *document)
+    : SPDesktopWidget(inkscape_window)
+{
+    set_name("SPDesktopWidget");
+
+    SPDesktopWidget *dtw = this;
+
+    SPNamedView *namedview = document->getNamedView();
+
+    dtw->_dt2r = 1. / namedview->display_units->factor;
+
+    dtw->_ruler_origin = Geom::Point(0,0); //namedview->gridorigin;   Why was the grid origin used here?
+
+    // This section seems backwards!
+    dtw->desktop = new SPDesktop();
+    dtw->desktop->init (namedview, dtw->_canvas, this);
+    dtw->_canvas->set_desktop(desktop);
+    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->_canvas_grid->UpdateRulers();
+
+    dtw->setView(dtw->desktop);
+
+    /* Listen on namedview modification */
+    dtw->modified_connection = namedview->connectModified(sigc::mem_fun(*dtw, &SPDesktopWidget::namedviewModified));
+
+    _layer_selector->setDesktop(dtw->desktop);
+
+    // We never want a page widget if there's no desktop.
+    _page_selector = Gtk::manage(new Inkscape::UI::Widget::PageSelector(desktop));
+    _statusbar->pack_end(*_page_selector, false, false);
+
+    ToolboxFactory::setToolboxDesktop(dtw->aux_toolbox, dtw->desktop);
+
+    dtw->layoutWidgets();
+
+    dtw->_panels->setDesktop(dtw->desktop);
+}
+
+
+void
+SPDesktopWidget::update_rulers()
+{
+    _canvas_grid->UpdateRulers();
+}
+
+
+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?
+
+        _canvas_grid->GetVRuler()->set_unit(nv->getDisplayUnit());
+        _canvas_grid->GetHRuler()->set_unit(nv->getDisplayUnit());
+        _canvas_grid->GetVRuler()->set_tooltip_text(gettext(nv->display_units->name_plural.c_str()));
+        _canvas_grid->GetHRuler()->set_tooltip_text(gettext(nv->display_units->name_plural.c_str()));
+        _canvas_grid->UpdateRulers();
+
+        /* This loops through all the grandchildren of aux toolbox,
+         * and for each that it finds, it performs an sp_search_by_name_recursive(),
+         * looking for widgets named "unit-tracker" (this is used by
+         * all toolboxes to refer to the unit selector). The default document units
+         * is then selected within these unit selectors.
+         *
+         * 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 (auto container = dynamic_cast<Gtk::Container *>(i)) {
+                    std::vector<Gtk::Widget*> grch = container->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" || name == "CalligraphicToolbar" )
+                            continue;
+
+                        auto tracker = dynamic_cast<Inkscape::UI::Widget::ComboToolItem*>(sp_search_by_name_recursive(j, "unit-tracker"));
+
+                        if (tracker) { // it's null when inkscape is first opened
+                            if (auto ptr = static_cast<UnitTracker*>(tracker->get_data(Glib::Quark("unit-tracker")))) {
+                                ptr->setActiveUnit(nv->display_units);
+                            }
+                        }
+                    } // grandchildren
+                } // if child is a container
+            } // children
+        } // if aux_toolbox is a container
+    }
+}
+
+void
+SPDesktopWidget::on_adjustment_value_changed()
+{
+    if (update)
+        return;
+
+    update = true;
+
+    // Do not call canvas->scrollTo directly... messes up 'offset'.
+    desktop->scroll_absolute( Geom::Point(_canvas_grid->GetHAdj()->get_value(),
+                                          _canvas_grid->GetVAdj()->get_value()), false);
+
+    update = false;
+}
+
+/* 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)
+{
+    double new_typed = g_strtod (_zoom_status->get_text().c_str(), nullptr);
+    *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()
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    double const zoom_factor = pow (2, _zoom_status->get_value());
+
+    // Zoom around center of window
+    Geom::Rect const d_canvas = _canvas->get_area_world();
+    Geom::Point midpoint = desktop->w2d(d_canvas.midpoint());
+
+    _zoom_status_value_changed_connection.block();
+    if(prefs->getDouble("/options/zoomcorrection/shown", true)) {
+        desktop->zoom_realworld(midpoint, zoom_factor);
+    } else {
+        desktop->zoom_absolute(midpoint, zoom_factor);
+    }
+    _zoom_status_value_changed_connection.unblock();
+    _zoom_status->defocus();
+}
+
+void
+SPDesktopWidget::zoom_menu_handler(double factor)
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    if(prefs->getDouble("/options/zoomcorrection/shown", true)) {
+        desktop->zoom_realworld(desktop->current_center(), factor);
+    } else {
+        desktop->zoom_absolute(desktop->current_center(), factor, false);
+    }
+}
+
+
+
+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([=]() { desktop->getDocument()->getPageManager().zoomToSelectedPage(desktop); });
+    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([=]() { desktop->getDocument()->getPageManager().centerToSelectedPage(desktop); });
+    menu->append(*item_center_page);
+
+    menu->show_all();
+}
+
+
+void
+SPDesktopWidget::sticky_zoom_toggled()
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    prefs->setBool("/options/stickyzoom/value", _canvas_grid->GetStickyZoom()->get_active());
+}
+
+
+void
+SPDesktopWidget::update_zoom()
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    // It's very important that the value used in set_value is the same as the one
+    // set as it otherwise creates an infinate loop between the spin button and update_zoom
+    double correction = 1.0;
+    if(prefs->getDouble("/options/zoomcorrection/shown", true)) {
+        correction = prefs->getDouble("/options/zoomcorrection/value", 1.0);
+    }
+    _zoom_status_value_changed_connection.block();
+    _zoom_status->set_value(log(desktop->current_zoom() / correction) / log(2));
+    _zoom_status->queue_draw();
+    _zoom_status_value_changed_connection.unblock();
+}
+
+
+// ---------------------- Rotation ------------------------
+
+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 = _canvas->get_area_world();
+    _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();
+
+    _rotation_status->defocus();
+}
+
+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_command_palette() {
+    // TODO: Turn into action and remove this function.
+    _canvas_grid->ToggleCommandPalette();
+}
+
+void
+SPDesktopWidget::toggle_rulers()
+{
+    // TODO: Turn into action and remove this function.
+    _canvas_grid->ToggleRulers();
+}
+
+void
+SPDesktopWidget::toggle_scrollbars()
+{
+    // TODO: Turn into action and remove this function.
+    _canvas_grid->ToggleScrollbars();
+}
+
+bool
+SPDesktopWidget::get_color_prof_adj_enabled() const
+{
+    auto _cms_adjust = _canvas_grid->GetCmsAdjust();
+    return _cms_adjust->get_sensitive() && _cms_adjust->get_active();
+}
+
+void
+SPDesktopWidget::toggle_color_prof_adj()
+{
+    auto _cms_adjust = _canvas_grid->GetCmsAdjust();
+    if (_cms_adjust->get_sensitive()) {
+        bool active = _cms_adjust->get_active();
+        _cms_adjust->set_active(!active);
+    }
+}
+
+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 = true;
+
+    /* The desktop region we always show unconditionally */
+    SPDocument *doc = desktop->doc();
+
+    auto deskarea = doc->preferredBounds();
+    deskarea->expandBy(doc->getDimensions()); // Double size
+
+    /* The total size of pages should be added unconditionally */
+    deskarea->unionWith(doc->getPageManager().getDesktopRect());
+
+    if (Inkscape::Preferences::get()->getInt("/tools/bounding_box") == 0) {
+        deskarea->unionWith(doc->getRoot()->desktopVisualBounds());
+    } else {
+        deskarea->unionWith(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->get_area_world();
+
+    /* Viewbox is always included into scrollable region */
+    carea = Geom::unify(carea, viewbox);
+
+    auto _hadj = _canvas_grid->GetHAdj();
+    auto _vadj = _canvas_grid->GetVAdj();
+    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 = false;
+}
+
+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(widget), horiz);
+        break;
+    case GDK_MOTION_NOTIFY:
+        dtw->on_ruler_box_motion_notify_event(&event->motion, Glib::wrap(widget), horiz);
+        break;
+    case GDK_BUTTON_RELEASE:
+        dtw->on_ruler_box_button_release_event(&event->button, Glib::wrap(widget), horiz);
+        break;
+    default:
+            break;
+    }
+
+    return FALSE;
+}
+
+bool
+SPDesktopWidget::on_ruler_box_motion_notify_event(GdkEventMotion *event, Gtk::Widget *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->gobj()));
+
+    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 event_w(_canvas->canvas_to_world(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->setShowGuides(true);
+        }
+
+        Geom::Point normal = _normal;
+        if (!(event->state & GDK_SHIFT_MASK)) {
+            ruler_snap_new_guide(desktop, event_dt, normal);
+        }
+        _active_guide->set_normal(normal);
+        _active_guide->set_origin(event_dt);
+
+        desktop->set_coordinate_status(event_dt);
+    }
+
+    return false;
+}
+
+// End guide creation or toggle guides on/off.
+bool
+SPDesktopWidget::on_ruler_box_button_release_event(GdkEventButton *event, Gtk::Widget *widget, bool horiz)
+{
+    int wx, wy;
+
+    GdkWindow *window = gtk_widget_get_window(GTK_WIDGET(_canvas->gobj()));
+
+    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) {
+        desktop->event_context->discard_delayed_snap_event();
+
+        auto seat = gdk_device_get_seat(event->device);
+        gdk_seat_ungrab(seat);
+
+        Geom::Point const event_w(_canvas->canvas_to_world(event_win));
+        Geom::Point event_dt(desktop->w2d(event_w));
+
+        Geom::Point normal = _normal;
+        if (!(event->state & GDK_SHIFT_MASK)) {
+            ruler_snap_new_guide(desktop, event_dt, normal);
+        }
+
+        delete _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;
+            }
+            repr->setAttributePoint("position", Geom::Point( newx, newy ));
+            repr->setAttributePoint("orientation", normal);
+            desktop->namedview->appendChild(repr);
+            Inkscape::GC::release(repr);
+            DocumentUndo::done(desktop->getDocument(), _("Create guide"), "");
+        }
+        desktop->set_coordinate_status(event_dt);
+
+        if (!_ruler_dragged) {
+            // Ruler click (without drag) toggle the guide visibility on and off
+            desktop->namedview->toggleShowGuides();
+        }
+
+        _ruler_clicked = false;
+        _ruler_dragged = false;
+    }
+
+    return false;
+}
+
+// Start guide creation by dragging from ruler.
+bool
+SPDesktopWidget::on_ruler_box_button_press_event(GdkEventButton *event, Gtk::Widget *widget, bool horiz)
+{
+    if (_ruler_clicked) // event triggered on a double click: do no process the click
+        return false;
+
+    int wx, wy;
+
+    GdkWindow *window = gtk_widget_get_window(GTK_WIDGET(_canvas->gobj()));
+
+    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(_canvas->canvas_to_world(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 = new Inkscape::CanvasItemGuideLine(desktop->getCanvasGuides(), Glib::ustring(), event_dt, _normal);
+        _active_guide->set_stroke(desktop->namedview->guidehicolor);
+
+        // Ruler grabs all events until button release.
+        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;
+}
+
+void
+SPDesktopWidget::ruler_snap_new_guide(SPDesktop *desktop, Geom::Point &event_dt, Geom::Point &normal)
+{
+    desktop->getCanvas()->grab_focus();
+    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.isTargetSnappable(Inkscape::SNAPTARGET_PATH_PERPENDICULAR);
+    bool pref_tang = m.snapprefs.isTargetSnappable(Inkscape::SNAPTARGET_PATH_TANGENTIAL);
+    m.snapprefs.setTargetSnappable(Inkscape::SNAPTARGET_PATH_PERPENDICULAR, false);
+    m.snapprefs.setTargetSnappable(Inkscape::SNAPTARGET_PATH_TANGENTIAL, 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.setTargetSnappable(Inkscape::SNAPTARGET_PATH_PERPENDICULAR, pref_perp);
+    m.snapprefs.setTargetSnappable(Inkscape::SNAPTARGET_PATH_TANGENTIAL, 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 :