8 files changed, 1079 insertions, 0 deletions
diff --git a/src/ui/view/README b/src/ui/view/README
new file mode 100644
index 0000000..9316f8b
--- /dev/null
+++ b/src/ui/view/README
@@ -0,0 +1,51 @@
+
+This directory contains the class Inkscape::UI::View::View and related items.
+
+View is an abstract base class for all UI document views. Documents
+can be displayed by more than one window, each having its own view
+(e.g. zoom level, selection, etc.).
+
+View is the base class for:
+
+* SPDesktop
+* SVGView  REMOVED
+
+SPViewWidget is the base for:
+
+* SPDocumentWidget
+* SPSVGViewWidget  REMOVED
+
+SPSVGViewWidget has been replaced by SVGViewWidget, see below.
+
+
+SPViewWidget:
+  Contains a GtkEventBox and holds a View.
+
+SPDesktopWidget:
+  Contains:
+    VBox
+      HBox
+        GtkGrid
+         GtkPaned
+           GtkGrid
+             SPCanvas
+   Plus lots of other junk.
+
+
+SVGViewWidget:
+  Used many places as a convenient way to show an SVG (file dialog, Inkview).
+  Derived, rather uselessly, from Gtk::Scrollbar.
+  It no longer is dependent on View (and really doesn't belong here anymore).
+
+ It contains: SPCanvas
+
+To do:
+
+
+* Convert everything to C++.
+* Evaluate moving SPDesktopWidget down the widget stack.
+  It doesn't use the EventBox of SPViewWidget!
+
+A DesktopViewWidget should contain:
+  DesktopView (aka SPDesktop)
+  SPCanvas
diff --git a/src/ui/view/edit-widget-interface.h b/src/ui/view/edit-widget-interface.h
new file mode 100644
index 0000000..eb3e33b
--- /dev/null
+++ b/src/ui/view/edit-widget-interface.h
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Authors:
+ *     Ralf Stephan <ralf@ark.in-berlin.de>
+ *     John Bintz <jcoswell@coswellproductions.org>
+ *
+ * Copyright (C) 2006 John Bintz
+ * Copyright (C) 2005 Ralf Stephan
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef INKSCAPE_UI_VIEW_EDIT_WIDGET_IFACE_H
+#define INKSCAPE_UI_VIEW_EDIT_WIDGET_IFACE_H
+
+#include "message.h"
+#include <2geom/point.h>
+
+namespace Gtk {
+    class Toolbar;
+    class Window;
+}
+
+namespace Glib {
+class ustring;
+}
+
+namespace Inkscape { namespace UI { namespace Widget { class Dock; } } }
+
+namespace Inkscape {
+namespace UI {
+namespace View {
+
+/**
+ * Abstract base class for all EditWidget implementations.
+ */
+struct EditWidgetInterface
+{
+    EditWidgetInterface() = default;
+    virtual ~EditWidgetInterface() = default;
+
+    /// Returns pointer to window UI object as void*
+    virtual Gtk::Window *getWindow() = 0;
+
+    /// Set the widget's title
+    virtual void setTitle (gchar const*) = 0;
+
+    /// Show all parts of widget the user wants to see.
+    virtual void layout() = 0;
+
+    /// Present widget to user
+    virtual void present() = 0;
+
+    /// Returns geometry of widget
+    virtual void getGeometry (gint &x, gint &y, gint &w, gint &h) = 0;
+
+    /// Change the widget's size
+    virtual void setSize (gint w, gint h) = 0;
+
+    /// Move widget to specified position
+    virtual void setPosition (Geom::Point p) = 0;
+
+    /// Transientize widget
+    virtual void setTransient (void*, int) = 0;
+
+    /// Return mouse position in widget
+    virtual Geom::Point getPointer() = 0;
+
+    /// Make widget iconified
+    virtual void setIconified() = 0;
+
+    /// Make widget maximized on screen
+    virtual void setMaximized() = 0;
+
+    /// Make widget fill screen and show it if possible.
+    virtual void setFullscreen() = 0;
+
+    /// Shuts down the desktop object for the view being closed.  It checks
+    /// to see if the document has been edited, and if so prompts the user
+    /// to save, discard, or cancel.  Returns TRUE if the shutdown operation
+    /// is cancelled or if the save is cancelled or fails, FALSE otherwise.
+    virtual bool shutdown() = 0;
+
+    /// Destroy and delete widget.
+    virtual void destroy() = 0;
+
+
+    /// Store window position to prefs
+    virtual void storeDesktopPosition() = 0;
+
+    /// Queue a redraw request with the canvas
+    virtual void requestCanvasUpdate() = 0;
+
+    /// Force a redraw of the canvas
+    virtual void requestCanvasUpdateAndWait() = 0;
+
+    /// Enable interaction on this desktop
+    virtual void enableInteraction() = 0;
+
+    /// Disable interaction on this desktop
+    virtual void disableInteraction() = 0;
+
+    /// Update the "active desktop" indicator
+    virtual void activateDesktop() = 0;
+
+    /// Update the "inactive desktop" indicator
+    virtual void deactivateDesktop() = 0;
+
+    /// Update rulers from current values
+    virtual void updateRulers() = 0;
+
+    /// Update scrollbars from current values
+    virtual void updateScrollbars (double scale) = 0;
+
+    /// Toggle rulers on/off and set preference value accordingly
+    virtual void toggleRulers() = 0;
+
+    /// Toggle scrollbars on/off and set preference value accordingly
+    virtual void toggleScrollbars() = 0;
+
+    /// Toggle CMS on/off and set preference value accordingly
+    virtual void toggleColorProfAdjust() = 0;
+
+    /// Is CMS on/off
+    virtual bool colorProfAdjustEnabled() = 0;
+
+    /// Temporarily block signals and update zoom display
+    virtual void updateZoom() = 0;
+
+    /// The zoom display will get the keyboard focus.
+    virtual void letZoomGrabFocus() = 0;
+
+    /// Temporarily block signals and update rotation display
+    virtual void updateRotation() = 0;
+
+    virtual Gtk::Toolbar* get_toolbar_by_name(const Glib::ustring&) = 0;
+
+    /// In auxiliary toolbox, set focus to widget having specific id
+    virtual void setToolboxFocusTo (const gchar *) = 0;
+
+    /// In auxiliary toolbox, set value of adjustment with specific id
+    virtual void setToolboxAdjustmentValue (const gchar *, double) = 0;
+
+    /// In auxiliary toolbox, return true if specific togglebutton is active
+    virtual bool isToolboxButtonActive (gchar const*) = 0;
+
+    /// Set the coordinate display
+    virtual void setCoordinateStatus (Geom::Point p) = 0;
+
+    /// Message widget will get no content
+    virtual void setMessage (Inkscape::MessageType type, gchar const* msg) = 0;
+
+
+    /** Show an info dialog with the given message */
+    virtual bool showInfoDialog( Glib::ustring const &message ) = 0;
+
+    /// Open yes/no dialog with warning text and confirmation question.
+    virtual bool warnDialog (Glib::ustring const &) = 0;
+
+    virtual Inkscape::UI::Widget::Dock* getDock () = 0;
+};
+
+} // namespace View
+} // namespace UI
+} // namespace Inkscape
+
+#endif // INKSCAPE_UI_VIEW_EDIT_WIDGET_IFACE_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/view/svg-view-widget.cpp b/src/ui/view/svg-view-widget.cpp
new file mode 100644
index 0000000..c349b5a
--- /dev/null
+++ b/src/ui/view/svg-view-widget.cpp
@@ -0,0 +1,266 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * A light-weight widget containing an SPCanvas for rendering an SVG.
+ */
+/*
+ * Authors:
+ *   Tavmjong Bah <tavmjong@free.fr>
+ *
+ * Includes code moved from svg-view.cpp authored by:
+ *   MenTaLGuy
+ *   Ralf Stephan <ralf@ark.in-berlin.de>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2018 Authors
+ *
+ * The contents of this file may be used under the GNU General Public License Version 2 or later.
+ * Read the file 'COPYING' for more information.
+ *
+ */
+
+#include <iostream>
+
+#include "svg-view-widget.h"
+
+#include "document.h"
+
+#include "2geom/transforms.h"
+
+#include "display/sp-canvas.h"
+#include "display/sp-canvas-group.h"
+#include "display/sp-canvas-item.h"
+#include "display/canvas-arena.h"
+
+#include "object/sp-item.h"
+#include "object/sp-root.h"
+
+#include "util/units.h"
+
+namespace Inkscape {
+namespace UI {
+namespace View {
+
+/**
+ * Callback connected with arena_event.
+ */
+// This hasn't worked since at least 0.48. It should result in a cursor change over <a></a> links.
+// There should be a better way of doing this. See note in canvas-arena.cpp.
+static gint arena_handler(SPCanvasArena */*arena*/, Inkscape::DrawingItem *ai,
+                          GdkEvent *event, SVGViewWidget *svgview)
+{
+    static gdouble x, y;
+    static gboolean active = FALSE;
+    SPEvent spev;
+
+    SPItem *spitem = (ai) ? ai->getItem() : nullptr;
+
+    switch (event->type) {
+        case GDK_BUTTON_PRESS:
+            if (event->button.button == 1) {
+                active = TRUE;
+                x = event->button.x;
+                y = event->button.y;
+            }
+            break;
+        case GDK_BUTTON_RELEASE:
+            if (event->button.button == 1) {
+                if (active && (event->button.x == x) &&
+                    (event->button.y == y)) {
+                    spev.type = SPEvent::ACTIVATE;
+                    if ( spitem != nullptr )
+                    {
+                        spitem->emitEvent (spev);
+                    }
+                }
+            }
+            active = FALSE;
+            break;
+        case GDK_MOTION_NOTIFY:
+            active = FALSE;
+            break;
+        case GDK_ENTER_NOTIFY:
+            spev.type = SPEvent::MOUSEOVER;
+            spev.view = svgview;
+            if ( spitem != nullptr )
+            {
+                spitem->emitEvent (spev);
+            }
+            break;
+        case GDK_LEAVE_NOTIFY:
+            spev.type = SPEvent::MOUSEOUT;
+            spev.view = svgview;
+            if ( spitem != nullptr )
+            {
+                spitem->emitEvent (spev);
+            }
+            break;
+        default:
+            break;
+    }
+
+    return TRUE;
+}
+
+
+/**
+ * A light-weight widget containing an SPCanvas for rendering an SVG.
+ * It's derived from a Gtk::ScrolledWindow like the previous C version, but that doesn't seem to be
+ * too useful.
+ */
+SVGViewWidget::SVGViewWidget(SPDocument* document)
+    : _document(nullptr)
+    , _dkey(0)
+    , _parent(nullptr)
+    , _drawing(nullptr)
+    , _hscale(1.0)
+    , _vscale(1.0)
+    , _rescale(false)
+    , _keepaspect(false)
+    , _width(0.0)
+    , _height(0.0)
+{
+    _canvas = SPCanvas::createAA();
+    add(*Glib::wrap(_canvas));
+
+    SPCanvasItem* item =
+        sp_canvas_item_new(SP_CANVAS(_canvas)->getRoot(), SP_TYPE_CANVAS_GROUP, nullptr);
+    _parent = SP_CANVAS_GROUP(item);
+
+    _drawing = sp_canvas_item_new (_parent, SP_TYPE_CANVAS_ARENA, nullptr);
+    g_signal_connect (G_OBJECT (_drawing), "arena_event", G_CALLBACK (arena_handler), this);
+
+    setDocument(document);
+
+    signal_size_allocate().connect(sigc::mem_fun(*this, &SVGViewWidget::size_allocate));
+}
+
+SVGViewWidget::~SVGViewWidget()
+{
+    if (_document) {
+        _document = nullptr;
+    }
+}
+
+void
+SVGViewWidget::setDocument(SPDocument* document)
+{
+    // Clear old document
+    if (_document) {
+        _document->getRoot()->invoke_hide(_dkey); // Removed from display tree
+    }
+
+    // Add new document
+    if (document) {
+        _document = document;
+
+        Inkscape::DrawingItem *ai = document->getRoot()->invoke_show(
+                SP_CANVAS_ARENA (_drawing)->drawing,
+                _dkey,
+                SP_ITEM_SHOW_DISPLAY);
+
+        if (ai) {
+            SP_CANVAS_ARENA (_drawing)->drawing.root()->prependChild(ai);
+        }
+
+        doRescale ();
+    }
+}
+
+void
+SVGViewWidget::setResize(int width, int height)
+{
+    // Triggers size_allocation which calls SVGViewWidget::size_allocate.
+    set_size_request(width, height);
+    queue_resize();
+}
+
+void
+SVGViewWidget::size_allocate(Gtk::Allocation& allocation)
+{
+    double width  = allocation.get_width();
+    double height = allocation.get_height();
+
+    if (width < 0.0 || height < 0.0) {
+        std::cerr << "SVGViewWidget::size_allocate: negative dimensions!" << std::endl;
+        return;
+    }
+
+    _rescale = true;
+    _keepaspect = true;
+    _width = width;
+    _height = height;
+
+    doRescale ();
+}
+
+void
+SVGViewWidget::doRescale()
+{
+    if (!_document) {
+        std::cerr << "SVGViewWidget::doRescale: No document!" << std::endl;
+        return;
+    }
+
+    if (_document->getWidth().value("px") < 1e-9) {
+        std::cerr << "SVGViewWidget::doRescale: Width too small!" << std::endl;
+        return;
+    }
+
+    if (_document->getHeight().value("px") < 1e-9) {
+        std::cerr << "SVGViewWidget::doRescale: Height too small!" << std::endl;
+        return;
+    }
+
+    double x_offset = 0.0;
+    double y_offset = 0.0;
+    if (_rescale) {
+        _hscale = _width / _document->getWidth().value("px");
+        _vscale = _height / _document->getHeight().value("px");
+        if (_keepaspect) {
+            if (_hscale > _vscale) {
+                _hscale = _vscale;
+                x_offset = (_width  - _document->getWidth().value("px")  * _vscale)/2.0;
+            } else {
+                _vscale = _hscale;
+                y_offset = (_height - _document->getHeight().value("px") * _hscale)/2.0;
+            }
+        }
+    }
+
+    if (_drawing) {
+        sp_canvas_item_affine_absolute (_drawing, Geom::Scale(_hscale, _vscale) * Geom::Translate(x_offset, y_offset));
+    }
+}
+
+void
+SVGViewWidget::mouseover()
+{
+    GdkDisplay *display = gdk_display_get_default();
+    GdkCursor  *cursor  = gdk_cursor_new_for_display(display, GDK_HAND2);
+    GdkWindow *window = gtk_widget_get_window (GTK_WIDGET(SP_CANVAS_ITEM(_drawing)->canvas));
+    gdk_window_set_cursor(window, cursor);
+    g_object_unref(cursor);
+}
+
+void
+SVGViewWidget::mouseout()
+{
+    GdkWindow *window = gtk_widget_get_window (GTK_WIDGET(SP_CANVAS_ITEM(_drawing)->canvas));
+    gdk_window_set_cursor(window, nullptr);
+}
+
+} // Namespace View
+} // Namespace UI
+} // Namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8 :
diff --git a/src/ui/view/svg-view-widget.h b/src/ui/view/svg-view-widget.h
new file mode 100644
index 0000000..644c879
--- /dev/null
+++ b/src/ui/view/svg-view-widget.h
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * A light-weight widget containing an SPCanvas with for rendering an SVG.
+ */
+/*
+ * Authors:
+ *   Tavmjong Bah <tavmjong@free.fr>
+ *
+ * Copyright (C) 2018 Authors
+ *
+ * The contents of this file may be used under the GNU General Public License Version 2 or later.
+ * Read the file 'COPYING' for more information.
+ *
+ */
+
+#ifndef INKSCAPE_UI_SVG_VIEW_WIDGET_VARIATIONS_H
+#define INKSCAPE_UI_SVG_VIEW_WIDGET_VARIATIONS_H
+
+
+#include <gtkmm.h>
+
+class SPDocument;
+class SPCanvasGroup;
+class SPCanvasItem;
+
+namespace Inkscape {
+namespace UI {
+namespace View {
+
+/**
+ * A light-weight widget containing an SPCanvas for rendering an SVG.
+ */
+class SVGViewWidget : public Gtk::ScrolledWindow {
+
+public:
+    SVGViewWidget(SPDocument* document);
+    ~SVGViewWidget() override;
+    void setDocument(  SPDocument* document);
+    void setResize( int width, int height);
+
+private:
+    void size_allocate(Gtk::Allocation& allocation);
+
+    GtkWidget* _canvas;
+
+// From SVGView ---------------------------------
+
+public:
+    SPDocument*     _document;
+    unsigned int    _dkey;
+    SPCanvasGroup  *_parent;
+    SPCanvasItem   *_drawing;
+    double          _hscale;     ///< horizontal scale
+    double          _vscale;     ///< vertical scale
+    bool            _rescale;    ///< whether to rescale automatically
+    bool            _keepaspect;
+    double          _width;
+    double          _height;
+
+    /**
+     * Helper function that sets rescale ratio.
+     */
+    void doRescale();
+
+    /**
+     * Change cursor (used for links).
+     */
+    void mouseover();
+    void mouseout();
+
+};
+
+} // Namespace View
+} // Namespace UI
+} // Namespace Inkscape
+
+#endif // INKSCAPE_UI_SVG_VIEW_WIDGET
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8 :
diff --git a/src/ui/view/view-widget.cpp b/src/ui/view/view-widget.cpp
new file mode 100644
index 0000000..ce9745d
--- /dev/null
+++ b/src/ui/view/view-widget.cpp
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Ralf Stephan <ralf@ark.in-berlin.de>
+ *
+ * Copyright (C) 2001-2002 Lauris Kaplinski
+ * Copyright (C) 2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "view.h"
+#include "view-widget.h"
+
+//using namespace Inkscape::UI::View;
+
+// SPViewWidget
+static void sp_view_widget_dispose(GObject *object);
+
+G_DEFINE_TYPE(SPViewWidget, sp_view_widget, GTK_TYPE_EVENT_BOX);
+
+/**
+ * Callback to initialize the SPViewWidget vtable.
+ */
+static void sp_view_widget_class_init(SPViewWidgetClass *vwc)
+{
+    GObjectClass *object_class = G_OBJECT_CLASS(vwc);
+    
+    object_class->dispose = sp_view_widget_dispose;
+}
+
+/**
+ * Callback to initialize the SPViewWidget.
+ */
+static void sp_view_widget_init(SPViewWidget *vw)
+{
+    vw->view = nullptr;
+}
+
+/**
+ * Callback to disconnect from view and destroy SPViewWidget.
+ *
+ * Apparently, this gets only called when a desktop is closed, but then twice!
+ */
+static void sp_view_widget_dispose(GObject *object)
+{
+    SPViewWidget *vw = SP_VIEW_WIDGET(object);
+
+    if (vw->view) {
+        vw->view->close();
+        Inkscape::GC::release(vw->view);
+        vw->view = nullptr;
+    }
+
+    if (G_OBJECT_CLASS(sp_view_widget_parent_class)->dispose) {
+        G_OBJECT_CLASS(sp_view_widget_parent_class)->dispose(object);
+    }
+
+    Inkscape::GC::request_early_collection();
+}
+
+void sp_view_widget_set_view(SPViewWidget *vw, Inkscape::UI::View::View *view)
+{
+    g_return_if_fail(vw != nullptr);
+    g_return_if_fail(SP_IS_VIEW_WIDGET(vw));
+    g_return_if_fail(view != nullptr);
+    
+    g_return_if_fail(vw->view == nullptr);
+    
+    vw->view = view;
+    Inkscape::GC::anchor(view);
+
+    if (((SPViewWidgetClass *) G_OBJECT_GET_CLASS(vw))->set_view) {
+        ((SPViewWidgetClass *) G_OBJECT_GET_CLASS(vw))->set_view(vw, view);
+    }
+}
+
+bool sp_view_widget_shutdown(SPViewWidget *vw)
+{
+    g_return_val_if_fail(vw != nullptr, TRUE);
+    g_return_val_if_fail(SP_IS_VIEW_WIDGET(vw), TRUE);
+
+    if (((SPViewWidgetClass *) G_OBJECT_GET_CLASS(vw))->shutdown) {
+        return ((SPViewWidgetClass *) G_OBJECT_GET_CLASS(vw))->shutdown(vw);
+    }
+
+    return FALSE;
+}
+
+
+
+/*
+  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 :
diff --git a/src/ui/view/view-widget.h b/src/ui/view/view-widget.h
new file mode 100644
index 0000000..0296ac6
--- /dev/null
+++ b/src/ui/view/view-widget.h
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_UI_VIEW_VIEWWIDGET_H
+#define INKSCAPE_UI_VIEW_VIEWWIDGET_H
+
+/*
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Ralf Stephan <ralf@ark.in-berlin.de>
+ *
+ * Copyright (C) 2001-2002 Lauris Kaplinski
+ * Copyright (C) 2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <gtk/gtk.h>
+
+
+namespace Inkscape {
+namespace UI {
+namespace View {
+class View;
+} // namespace View
+} // namespace UI
+} // namespace Inkscape
+
+class SPViewWidget;
+class SPNamedView;
+
+#define SP_TYPE_VIEW_WIDGET (sp_view_widget_get_type ())
+#define SP_VIEW_WIDGET(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), SP_TYPE_VIEW_WIDGET, SPViewWidget))
+#define SP_VIEW_WIDGET_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), SP_TYPE_VIEW_WIDGET, SPViewWidgetClass))
+#define SP_IS_VIEW_WIDGET(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), SP_TYPE_VIEW_WIDGET))
+#define SP_IS_VIEW_WIDGET_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), SP_TYPE_VIEW_WIDGET))
+#define SP_VIEW_WIDGET_VIEW(w) (SP_VIEW_WIDGET (w)->view)
+#define SP_VIEW_WIDGET_DOCUMENT(w) (SP_VIEW_WIDGET (w)->view ? ((SPViewWidget *) (w))->view->doc : NULL)
+
+/**
+ * Registers the SPViewWidget class with Glib and returns its type number.
+ */
+GType sp_view_widget_get_type();
+
+/**
+ * Connects widget to view's 'resized' signal and calls virtual set_view()
+ * function.
+ */
+void sp_view_widget_set_view(SPViewWidget *vw, Inkscape::UI::View::View *view);
+
+/**
+ * Allows presenting 'save changes' dialog, FALSE - continue, TRUE - cancel.
+ * Calls the virtual shutdown() function of the SPViewWidget.
+ */
+bool sp_view_widget_shutdown(SPViewWidget *vw);
+
+/**
+ * SPViewWidget is a GUI widget that contain a single View. It is also
+ * an abstract base class with little functionality of its own.
+ */
+class SPViewWidget {
+ public:
+    GtkEventBox eventbox;  // NOT USED!
+
+        Inkscape::UI::View::View *view;
+
+    // C++ Wrappers
+    GType getType() const {
+	return sp_view_widget_get_type();
+    }
+
+    void setView(Inkscape::UI::View::View *view) {
+	sp_view_widget_set_view(this, view);
+    }
+
+    gboolean shutdown() {
+	return sp_view_widget_shutdown(this);
+    }
+
+//    void resized (double x, double y) = 0;
+};
+
+/**
+ * The Glib-style vtable for the SPViewWidget class.
+ */
+class SPViewWidgetClass {
+ public:
+    GtkEventBoxClass parent_class;
+
+    /* Virtual method to set/change/remove view */
+    void (* set_view) (SPViewWidget *vw, Inkscape::UI::View::View *view);
+    /// Virtual method about view size change
+    void (* view_resized) (SPViewWidget *vw, Inkscape::UI::View::View *view, gdouble width, gdouble height);
+
+    gboolean (* shutdown) (SPViewWidget *vw);
+};
+
+#endif
+
+/*
+  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 :
diff --git a/src/ui/view/view.cpp b/src/ui/view/view.cpp
new file mode 100644
index 0000000..3b2b7f2
--- /dev/null
+++ b/src/ui/view/view.cpp
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Ralf Stephan <ralf@ark.in-berlin.de>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2001-2002 Lauris Kaplinski
+ * Copyright (C) 2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/point.h>
+#include <memory>
+#include "document.h"
+#include "view.h"
+#include "message-stack.h"
+#include "message-context.h"
+#include "verbs.h"
+#include "inkscape.h"
+
+namespace Inkscape {
+namespace UI {
+namespace View {
+
+static void 
+_onResized (double x, double y, View* v)
+{
+    v->onResized (x,y);
+}
+
+static void 
+_onRedrawRequested (View* v)
+{
+    v->onRedrawRequested();
+}
+
+static void 
+_onStatusMessage (Inkscape::MessageType type, gchar const *message, View* v)
+{
+    v->onStatusMessage (type, message);
+}
+
+static void 
+_onDocumentURISet (gchar const* uri, View* v)
+{
+    v->onDocumentURISet (uri);
+}
+
+static void 
+_onDocumentResized (double x, double y, View* v)
+{
+    v->onDocumentResized (x,y);
+}
+
+//--------------------------------------------------------------------
+View::View()
+:  _doc(nullptr)
+{
+    _message_stack = std::make_shared<Inkscape::MessageStack>();
+    _tips_message_context = std::unique_ptr<Inkscape::MessageContext>(new Inkscape::MessageContext(_message_stack));
+
+    _resized_connection = _resized_signal.connect (sigc::bind (sigc::ptr_fun (&_onResized), this));
+    _redraw_requested_connection = _redraw_requested_signal.connect (sigc::bind (sigc::ptr_fun (&_onRedrawRequested), this));
+    
+    _message_changed_connection = _message_stack->connectChanged (sigc::bind (sigc::ptr_fun (&_onStatusMessage), this));
+}
+
+View::~View()
+{
+    _close();
+}
+
+void View::_close() {
+    _message_changed_connection.disconnect();
+
+    _tips_message_context = nullptr;
+
+    _message_stack = nullptr;
+
+    if (_doc) {
+        _document_uri_set_connection.disconnect();
+        _document_resized_connection.disconnect();
+        if (INKSCAPE.remove_document(_doc)) {
+            // this was the last view of this document, so delete it
+            // delete _doc;  Delete now handled in Inkscape::Application
+        }
+        _doc = nullptr;
+    }
+    
+   Inkscape::Verb::delete_all_view (this);
+}
+
+void View::emitResized (double width, double height)
+{
+    _resized_signal.emit (width, height);
+}
+
+void View::requestRedraw() 
+{
+    _redraw_requested_signal.emit();
+}
+
+void View::setDocument(SPDocument *doc) {
+    g_return_if_fail(doc != nullptr);
+
+    if (_doc) {
+        _document_uri_set_connection.disconnect();
+        _document_resized_connection.disconnect();
+        if (INKSCAPE.remove_document(_doc)) {
+            // this was the last view of this document, so delete it
+            // delete _doc; Delete now handled in Inkscape::Application
+        }
+    }
+
+    INKSCAPE.add_document(doc);
+
+    _doc = doc;
+    _document_uri_set_connection = 
+        _doc->connectURISet(sigc::bind(sigc::ptr_fun(&_onDocumentURISet), this));
+    _document_resized_connection = 
+        _doc->connectResized(sigc::bind(sigc::ptr_fun(&_onDocumentResized), this));
+    _document_uri_set_signal.emit( _doc->getDocumentURI() );
+}
+
+}}}
+
+/*
+  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 :
diff --git a/src/ui/view/view.h b/src/ui/view/view.h
new file mode 100644
index 0000000..3acfd2c
--- /dev/null
+++ b/src/ui/view/view.h
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_UI_VIEW_VIEW_H
+#define INKSCAPE_UI_VIEW_VIEW_H
+/*
+ * Authors:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Ralf Stephan <ralf@ark.in-berlin.de>
+ *
+ * Copyright (C) 2001-2002 Lauris Kaplinski
+ * Copyright (C) 2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <gdk/gdk.h>
+#include <cstddef>
+#include <memory>
+#include <sigc++/connection.h>
+#include "message.h"
+#include "inkgc/gc-managed.h"
+#include "gc-finalized.h"
+#include "gc-anchored.h"
+#include <2geom/forward.h>
+
+/**
+ * Iterates until true or returns false.
+ * When used as signal accumulator, stops emission if one slot returns true.
+ */
+struct StopOnTrue {
+  typedef bool result_type;
+
+  template<typename T_iterator>
+  result_type operator()(T_iterator first, T_iterator last) const{
+      for (; first != last; ++first)
+          if (*first) return true;
+      return false;
+  }
+};
+
+/**
+ * Iterates until nonzero or returns 0.
+ * When used as signal accumulator, stops emission if one slot returns nonzero.
+ */
+struct StopOnNonZero {
+  typedef int result_type;
+
+  template<typename T_iterator>
+  result_type operator()(T_iterator first, T_iterator last) const{
+      for (; first != last; ++first)
+          if (*first) return *first;
+      return 0;
+  }
+};
+
+class SPDocument;
+
+namespace Inkscape {
+    class MessageContext;
+    class MessageStack;
+    namespace UI {
+        namespace View {
+
+/**
+ * View is an abstract base class of all UI document views.  This
+ * includes both the editing window and the SVG preview, but does not
+ * include the non-UI RGBA buffer-based Inkscape::Drawing nor the XML editor or
+ * similar views.  The View base class has very little functionality of
+ * its own.
+ */
+class View : public GC::Managed<>,
+             public GC::Finalized,
+             public GC::Anchored
+{
+public:
+
+    View();
+
+    /**
+     * Deletes and nulls all View message stacks and disconnects it from signals.
+     */
+    ~View() override;
+
+    void close() { _close(); }
+
+    /// Returns a pointer to the view's document.
+    SPDocument *doc() const
+      { return _doc; }
+    /// Returns a pointer to the view's message stack.
+    std::shared_ptr<Inkscape::MessageStack> messageStack() const
+      { return _message_stack; }
+    /// Returns a pointer to the view's tipsMessageContext.
+    Inkscape::MessageContext *tipsMessageContext() const
+      { return _tips_message_context.get(); }
+
+    void emitResized(gdouble width, gdouble height);
+    void requestRedraw();
+
+    virtual void onResized (double, double) {};
+    virtual void onRedrawRequested() {};
+    virtual void onStatusMessage (Inkscape::MessageType type, gchar const *message) {};
+    virtual void onDocumentURISet (gchar const* uri) {};
+    virtual void onDocumentResized (double, double) {};
+    virtual bool shutdown() { return false; };
+
+protected:
+    SPDocument *_doc;
+    std::shared_ptr<Inkscape::MessageStack> _message_stack;
+    std::unique_ptr<Inkscape::MessageContext> _tips_message_context;
+
+    virtual void _close();
+
+    /**
+     * Disconnects the view from the document signals, connects the view 
+     * to a new one, and emits the _document_set_signal on the view.
+     *
+     * This is code common to all subclasses and called from their
+     * setDocument() methods after they are done.
+     * 
+     * @param doc The new document to connect the view to.
+     */
+    virtual void setDocument(SPDocument *doc);
+
+    sigc::signal<void,double,double>   _resized_signal;
+    sigc::signal<void,gchar const*>    _document_uri_set_signal;
+    sigc::signal<void>                 _redraw_requested_signal;
+
+private:
+    sigc::connection _resized_connection;
+    sigc::connection _redraw_requested_connection;
+    sigc::connection _message_changed_connection;  // foreign
+    sigc::connection _document_uri_set_connection; // foreign
+    sigc::connection _document_resized_connection; // foreign
+};
+
+}}}
+
+#endif  // INKSCAPE_UI_VIEW_VIEW_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :