moving trunk for module inkscape

(bzr r1)

1 files changed, 1270 insertions, 0 deletions

diff --git a/src/widgets/desktop-widget.cpp b/src/widgets/desktop-widget.cpp
new file mode 100644
index 000000000..f9a8b8f62
--- /dev/null
+++ b/src/widgets/desktop-widget.cpp
@@ -0,0 +1,1270 @@
+#define __SP_DESKTOP_WIDGET_C__
+
+/** \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>
+ *
+ * Copyright (C) 2004 MenTaLguY
+ * Copyright (C) 1999-2002 Lauris Kaplinski
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <gtkmm/paned.h>
+#include <gtk/gtk.h>
+
+#include "macros.h"
+#include "inkscape-private.h"
+#include "desktop-handles.h"
+#include "desktop-events.h"
+#include "document.h"
+#include "desktop-widget.h"
+#include "sp-namedview.h"
+#include "interface.h"
+#include "toolbox.h"
+#include "prefs-utils.h"
+#include "file.h"
+#include "display/canvas-arena.h"
+#include <extension/db.h>
+#include "helper/units.h"
+#include "widgets/button.h"
+#include "widgets/ruler.h"
+#include "widgets/widget-sizes.h"
+#include "widgets/spw-utilities.h"
+#include "widgets/spinbutton-events.h"
+#include "widgets/layer-selector.h"
+#include "ui/widget/selected-style.h"
+#include "sp-item.h"
+#include "dialogs/swatches.h"
+
+#ifdef WITH_INKBOARD
+#endif
+
+
+
+enum {
+    ACTIVATE,
+    DEACTIVATE,
+    MODIFIED,
+    EVENT_CONTEXT_CHANGED,
+    LAST_SIGNAL
+};
+
+
+//---------------------------------------------------------------------
+/* SPDesktopWidget */
+
+static void sp_desktop_widget_class_init (SPDesktopWidgetClass *klass);
+static void sp_desktop_widget_init (SPDesktopWidget *widget);
+static void sp_desktop_widget_destroy (GtkObject *object);
+
+static void sp_desktop_widget_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
+static void sp_desktop_widget_realize (GtkWidget *widget);
+
+static gint sp_desktop_widget_event (GtkWidget *widget, GdkEvent *event, SPDesktopWidget *dtw);
+
+
+
+static void sp_desktop_widget_adjustment_value_changed (GtkAdjustment *adj, SPDesktopWidget *dtw);
+static void sp_desktop_widget_namedview_modified (SPNamedView *nv, guint flags, SPDesktopWidget *dtw);
+
+static gdouble sp_dtw_zoom_value_to_display (gdouble value);
+static gdouble sp_dtw_zoom_display_to_value (gdouble value);
+static gint sp_dtw_zoom_input (GtkSpinButton *spin, gdouble *new_val, gpointer data);
+static bool sp_dtw_zoom_output (GtkSpinButton *spin, gpointer data);
+static void sp_dtw_zoom_value_changed (GtkSpinButton *spin, gpointer data);
+static void sp_dtw_zoom_populate_popup (GtkEntry *entry, GtkMenu *menu, gpointer data);
+static void sp_dtw_zoom_menu_handler (SPDesktop *dt, gdouble factor);
+static void sp_dtw_zoom_50 (GtkMenuItem *item, gpointer data);
+static void sp_dtw_zoom_100 (GtkMenuItem *item, gpointer data);
+static void sp_dtw_zoom_200 (GtkMenuItem *item, gpointer data);
+static void sp_dtw_zoom_page (GtkMenuItem *item, gpointer data);
+static void sp_dtw_zoom_drawing (GtkMenuItem *item, gpointer data);
+static void sp_dtw_zoom_selection (GtkMenuItem *item, gpointer data);
+
+SPViewWidgetClass *dtw_parent_class;
+
+void 
+SPDesktopWidget::setMessage (Inkscape::MessageType type, const gchar *message)
+{
+    GtkLabel *sb=GTK_LABEL(this->select_status);
+    gtk_label_set_markup (sb, message ? message : "");
+    // FIXME: TODO: remove <b></b> before displaying as tooltip
+    gtk_tooltips_set_tip (this->tt, this->select_status_eventbox, message ? message : "", NULL);
+}
+
+NR::Point
+SPDesktopWidget::window_get_pointer()
+{
+    gint x,y;
+    gdk_window_get_pointer (GTK_WIDGET (canvas)->window, &x, &y, NULL);
+    return NR::Point(x,y);
+}
+
+/**
+ * Registers SPDesktopWidget class and returns its type number.
+ */
+GtkType
+sp_desktop_widget_get_type (void)
+{
+    static GtkType type = 0;
+    if (!type) {
+        static const GtkTypeInfo info = {
+            "SPDesktopWidget",
+            sizeof (SPDesktopWidget),
+            sizeof (SPDesktopWidgetClass),
+            (GtkClassInitFunc) sp_desktop_widget_class_init,
+            (GtkObjectInitFunc) sp_desktop_widget_init,
+            NULL, NULL, NULL
+        };
+        type = gtk_type_unique (SP_TYPE_VIEW_WIDGET, &info);
+    }
+    return type;
+}
+
+/**
+ * SPDesktopWidget vtable initialization
+ */
+static void
+sp_desktop_widget_class_init (SPDesktopWidgetClass *klass)
+{
+    dtw_parent_class = (SPViewWidgetClass*)gtk_type_class (SP_TYPE_VIEW_WIDGET);
+
+    GtkObjectClass *object_class = (GtkObjectClass *) klass;
+    GtkWidgetClass *widget_class = (GtkWidgetClass *) klass;
+
+    object_class->destroy = sp_desktop_widget_destroy;
+
+    widget_class->size_allocate = sp_desktop_widget_size_allocate;
+    widget_class->realize = sp_desktop_widget_realize;
+}
+
+/**
+ * Callback for SPDesktopWidget object initialization.
+ */
+static void
+sp_desktop_widget_init (SPDesktopWidget *dtw)
+{
+    GtkWidget *widget;
+    GtkWidget *tbl;
+    GtkWidget *w;
+
+    GtkWidget *hbox;
+    GtkWidget *eventbox;
+    GtkStyle *style;
+
+    widget = GTK_WIDGET (dtw);
+
+    Gtk::VPaned* pane = manage( new Gtk::VPaned() );
+    pane->show_all();
+
+    dtw->window = 0;
+    
+    dtw->desktop = NULL;
+
+    dtw->tt = gtk_tooltips_new ();
+
+    /* Main table */
+    dtw->vbox = gtk_vbox_new (FALSE, 0);
+    gtk_container_add( GTK_CONTAINER(dtw), GTK_WIDGET(pane->gobj()) );
+
+    Gtk::VBox* tmp = Glib::wrap( GTK_VBOX(dtw->vbox) );
+    Gtk::VBox* boxWrap = manage( tmp );
+    pane->pack1( *boxWrap, true, true );
+
+    dtw->statusbar = gtk_hbox_new (FALSE, 0);
+    //gtk_widget_set_usize (dtw->statusbar, -1, BOTTOM_BAR_HEIGHT);
+    gtk_box_pack_end (GTK_BOX (dtw->vbox), dtw->statusbar, FALSE, TRUE, 0);
+
+    {
+        using Inkscape::UI::Dialogs::SwatchesPanel;
+
+        SwatchesPanel* swatches = manage( new SwatchesPanel() );
+        dtw->panels = GTK_WIDGET(swatches->gobj());
+        pane->pack2( *swatches, false, true );
+    }
+
+    hbox = gtk_hbox_new (FALSE, 0);
+    gtk_box_pack_end (GTK_BOX (dtw->vbox), hbox, TRUE, TRUE, 0);
+    gtk_widget_show (hbox);
+
+    dtw->aux_toolbox = sp_aux_toolbox_new ();
+    gtk_box_pack_end (GTK_BOX (dtw->vbox), dtw->aux_toolbox, FALSE, TRUE, 0);
+
+    dtw->commands_toolbox = sp_commands_toolbox_new ();
+    gtk_box_pack_end (GTK_BOX (dtw->vbox), dtw->commands_toolbox, FALSE, TRUE, 0);
+
+    dtw->tool_toolbox = sp_tool_toolbox_new ();
+    gtk_box_pack_start (GTK_BOX (hbox), dtw->tool_toolbox, FALSE, TRUE, 0);
+
+    tbl = gtk_table_new (4, 3, FALSE);
+    gtk_box_pack_start (GTK_BOX (hbox), tbl, TRUE, TRUE, 1);
+
+    /* Horizontal ruler */
+    eventbox = gtk_event_box_new ();
+    dtw->hruler = sp_hruler_new ();
+    dtw->hruler_box = eventbox;
+    sp_ruler_set_metric (GTK_RULER (dtw->hruler), SP_PT);
+    gtk_tooltips_set_tip (dtw->tt, dtw->hruler_box, gettext(sp_unit_get_plural (&sp_unit_get_by_id(SP_UNIT_PT))), NULL);
+    gtk_container_add (GTK_CONTAINER (eventbox), dtw->hruler);
+    gtk_table_attach (GTK_TABLE (tbl), eventbox, 1, 2, 0, 1, (GtkAttachOptions)(GTK_FILL), (GtkAttachOptions)(GTK_FILL), widget->style->xthickness, 0);
+    g_signal_connect (G_OBJECT (eventbox), "button_press_event", G_CALLBACK (sp_dt_hruler_event), dtw);
+    g_signal_connect (G_OBJECT (eventbox), "button_release_event", G_CALLBACK (sp_dt_hruler_event), dtw);
+    g_signal_connect (G_OBJECT (eventbox), "motion_notify_event", G_CALLBACK (sp_dt_hruler_event), dtw);
+
+    /* Vertical ruler */
+    eventbox = gtk_event_box_new ();
+    dtw->vruler = sp_vruler_new ();
+    dtw->vruler_box = eventbox;
+    sp_ruler_set_metric (GTK_RULER (dtw->vruler), SP_PT);
+    gtk_tooltips_set_tip (dtw->tt, dtw->vruler_box, gettext(sp_unit_get_plural (&sp_unit_get_by_id(SP_UNIT_PT))), NULL);
+    gtk_container_add (GTK_CONTAINER (eventbox), GTK_WIDGET (dtw->vruler));
+    gtk_table_attach (GTK_TABLE (tbl), eventbox, 0, 1, 1, 2, (GtkAttachOptions)(GTK_FILL), (GtkAttachOptions)(GTK_FILL), 0, widget->style->ythickness);
+    g_signal_connect (G_OBJECT (eventbox), "button_press_event", G_CALLBACK (sp_dt_vruler_event), dtw);
+    g_signal_connect (G_OBJECT (eventbox), "button_release_event", G_CALLBACK (sp_dt_vruler_event), dtw);
+    g_signal_connect (G_OBJECT (eventbox), "motion_notify_event", G_CALLBACK (sp_dt_vruler_event), dtw);
+
+    /* Horizontal scrollbar */
+    dtw->hadj = (GtkAdjustment *) gtk_adjustment_new (0.0, -4000.0, 4000.0, 10.0, 100.0, 4.0);
+    dtw->hscrollbar = gtk_hscrollbar_new (GTK_ADJUSTMENT (dtw->hadj));
+    gtk_table_attach (GTK_TABLE (tbl), dtw->hscrollbar, 1, 2, 2, 3, (GtkAttachOptions)(GTK_EXPAND | GTK_FILL), (GtkAttachOptions)(GTK_FILL), 0, 0);
+    /* Vertical scrollbar and the sticky zoom button */
+    dtw->vscrollbar_box = gtk_vbox_new (FALSE, 0);
+    dtw->sticky_zoom = sp_button_new_from_data ( GTK_ICON_SIZE_MENU,
+                                                 SP_BUTTON_TYPE_TOGGLE,
+                                                 NULL,
+                                                 "sticky_zoom",
+                                                 _("Zoom drawing if window size changes"),
+                                                 dtw->tt);
+    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (dtw->sticky_zoom), prefs_get_int_attribute ("options.stickyzoom", "value", 0));
+    gtk_box_pack_start (GTK_BOX (dtw->vscrollbar_box), dtw->sticky_zoom, FALSE, FALSE, 0);
+    dtw->vadj = (GtkAdjustment *) gtk_adjustment_new (0.0, -4000.0, 4000.0, 10.0, 100.0, 4.0);
+    dtw->vscrollbar = gtk_vscrollbar_new (GTK_ADJUSTMENT (dtw->vadj));
+    gtk_box_pack_start (GTK_BOX (dtw->vscrollbar_box), dtw->vscrollbar, TRUE, TRUE, 0);
+    gtk_table_attach (GTK_TABLE (tbl), dtw->vscrollbar_box, 2, 3, 0, 2, (GtkAttachOptions)(GTK_FILL), (GtkAttachOptions)(GTK_EXPAND | GTK_FILL), 0, 0);
+
+    /* Canvas */
+    w = gtk_frame_new (NULL);
+    gtk_table_attach (GTK_TABLE (tbl), w, 1, 2, 1, 2, (GtkAttachOptions)(GTK_EXPAND | GTK_FILL), (GtkAttachOptions)(GTK_EXPAND | GTK_FILL), 0, 0);
+    dtw->canvas = SP_CANVAS (sp_canvas_new_aa ());
+    GTK_WIDGET_SET_FLAGS (GTK_WIDGET (dtw->canvas), GTK_CAN_FOCUS);
+    style = gtk_style_copy (GTK_WIDGET (dtw->canvas)->style);
+    style->bg[GTK_STATE_NORMAL] = style->white;
+    gtk_widget_set_style (GTK_WIDGET (dtw->canvas), style);
+    gtk_widget_set_extension_events(GTK_WIDGET (dtw->canvas) , GDK_EXTENSION_EVENTS_ALL);
+    g_signal_connect (G_OBJECT (dtw->canvas), "event", G_CALLBACK (sp_desktop_widget_event), dtw);
+    gtk_container_add (GTK_CONTAINER (w), GTK_WIDGET (dtw->canvas));
+
+    dtw->selected_style = new Inkscape::UI::Widget::SelectedStyle(true);
+    GtkHBox *ss_ = dtw->selected_style->gobj();
+    gtk_box_pack_start (GTK_BOX (dtw->statusbar), GTK_WIDGET(ss_), FALSE, FALSE, 0);
+    gtk_box_pack_start (GTK_BOX (dtw->statusbar), gtk_vseparator_new(), FALSE, FALSE, 0);
+
+    // connect scrollbar signals
+    g_signal_connect (G_OBJECT (dtw->hadj), "value-changed", G_CALLBACK (sp_desktop_widget_adjustment_value_changed), dtw);
+    g_signal_connect (G_OBJECT (dtw->vadj), "value-changed", G_CALLBACK (sp_desktop_widget_adjustment_value_changed), dtw);
+
+    GtkWidget *statusbar_tail=gtk_statusbar_new();
+    gtk_statusbar_set_has_resize_grip(GTK_STATUSBAR(statusbar_tail), TRUE);
+    gtk_box_pack_end (GTK_BOX (dtw->statusbar), statusbar_tail, FALSE, FALSE, 0);
+
+    // zoom status spinbutton
+    dtw->zoom_status = gtk_spin_button_new_with_range (log(SP_DESKTOP_ZOOM_MIN)/log(2), log(SP_DESKTOP_ZOOM_MAX)/log(2), 0.1);
+    gtk_tooltips_set_tip (dtw->tt, dtw->zoom_status, _("Zoom"), NULL);
+    gtk_widget_set_size_request (dtw->zoom_status, STATUS_ZOOM_WIDTH, -1);
+    gtk_entry_set_width_chars (GTK_ENTRY (dtw->zoom_status), 6);
+    gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (dtw->zoom_status), FALSE);
+    gtk_spin_button_set_update_policy (GTK_SPIN_BUTTON (dtw->zoom_status), GTK_UPDATE_ALWAYS);
+    g_signal_connect (G_OBJECT (dtw->zoom_status), "input", G_CALLBACK (sp_dtw_zoom_input), dtw);
+    g_signal_connect (G_OBJECT (dtw->zoom_status), "output", G_CALLBACK (sp_dtw_zoom_output), dtw);
+    gtk_object_set_data (GTK_OBJECT (dtw->zoom_status), "dtw", dtw->canvas);
+    gtk_signal_connect (GTK_OBJECT (dtw->zoom_status), "focus-in-event", GTK_SIGNAL_FUNC (spinbutton_focus_in), dtw->zoom_status);
+    gtk_signal_connect (GTK_OBJECT (dtw->zoom_status), "key-press-event", GTK_SIGNAL_FUNC (spinbutton_keypress), dtw->zoom_status);
+    dtw->zoom_update = g_signal_connect (G_OBJECT (dtw->zoom_status), "value_changed", G_CALLBACK (sp_dtw_zoom_value_changed), dtw);
+    dtw->zoom_update = g_signal_connect (G_OBJECT (dtw->zoom_status), "populate_popup", G_CALLBACK (sp_dtw_zoom_populate_popup), dtw);
+
+    // cursor coordinates
+    dtw->coord_status = gtk_table_new (5, 2, FALSE);
+    gtk_table_set_row_spacings(GTK_TABLE(dtw->coord_status), 0);
+    gtk_table_set_col_spacings(GTK_TABLE(dtw->coord_status), 2);
+    gtk_table_attach(GTK_TABLE(dtw->coord_status), gtk_vseparator_new(), 0,1, 0,2, GTK_FILL, GTK_FILL, 0, 0);
+    eventbox = gtk_event_box_new ();
+    gtk_container_add (GTK_CONTAINER (eventbox), dtw->coord_status);
+    gtk_tooltips_set_tip (dtw->tt, eventbox, _("Cursor coordinates"), NULL);
+    GtkWidget *label_x = gtk_label_new("X:");
+    gtk_misc_set_alignment (GTK_MISC(label_x), 0.0, 0.5);
+    gtk_table_attach(GTK_TABLE(dtw->coord_status),  label_x, 1,2, 0,1, GTK_FILL, GTK_FILL, 0, 0);
+    GtkWidget *label_y = gtk_label_new("Y:");
+    gtk_misc_set_alignment (GTK_MISC(label_y), 0.0, 0.5);
+    gtk_table_attach(GTK_TABLE(dtw->coord_status),  label_y, 1,2, 1,2, GTK_FILL, GTK_FILL, 0, 0);
+    dtw->coord_status_x = gtk_label_new("0.0");
+    gtk_misc_set_alignment (GTK_MISC(dtw->coord_status_x), 0.0, 0.5);
+    dtw->coord_status_y = gtk_label_new("0.0");
+    gtk_misc_set_alignment (GTK_MISC(dtw->coord_status_y), 0.0, 0.5);
+    gtk_table_attach(GTK_TABLE(dtw->coord_status), dtw->coord_status_x, 2,3, 0,1, GTK_FILL, GTK_FILL, 0, 0);
+    gtk_table_attach(GTK_TABLE(dtw->coord_status), dtw->coord_status_y, 2,3, 1,2, GTK_FILL, GTK_FILL, 0, 0);
+    gtk_table_attach(GTK_TABLE(dtw->coord_status),  gtk_label_new("Z:"), 3,4, 0,2, GTK_FILL, GTK_FILL, 0, 0);
+    gtk_table_attach(GTK_TABLE(dtw->coord_status),  dtw->zoom_status, 4,5, 0,2, GTK_FILL, GTK_FILL, 0, 0);
+    sp_set_font_size_smaller (dtw->coord_status);
+    gtk_box_pack_end (GTK_BOX (statusbar_tail), eventbox, FALSE, FALSE, 1);
+
+    dtw->layer_selector = new Inkscape::Widgets::LayerSelector(NULL);
+    // FIXME: need to unreference on container destruction to avoid leak
+    dtw->layer_selector->reference();
+    //dtw->layer_selector->set_size_request(-1, SP_ICON_SIZE_BUTTON);
+    gtk_box_pack_start(GTK_BOX(dtw->statusbar), GTK_WIDGET(dtw->layer_selector->gobj()), FALSE, FALSE, 1);
+
+    dtw->select_status_eventbox = gtk_event_box_new ();
+    dtw->select_status = gtk_label_new (NULL);
+    gtk_misc_set_alignment (GTK_MISC (dtw->select_status), 0.0, 0.5);
+    gtk_widget_set_size_request (dtw->select_status, 1, -1);
+    // display the initial welcome message in the statusbar
+    gtk_label_set_markup (GTK_LABEL (dtw->select_status), _("<b>Welcome to Inkscape!</b> Use shape or freehand tools to create objects; use selector (arrow) to move or transform them."));
+    // space label 2 pixels from left edge
+    gtk_container_add (GTK_CONTAINER (dtw->select_status_eventbox), dtw->select_status);
+    gtk_box_pack_start (GTK_BOX (dtw->statusbar), gtk_hbox_new(FALSE, 0), FALSE, FALSE, 2);
+    gtk_box_pack_start (GTK_BOX (dtw->statusbar), dtw->select_status_eventbox, TRUE, TRUE, 0);
+
+    gtk_widget_show_all (dtw->vbox);
+}
+
+/**
+ * Called before SPDesktopWidget destruction.
+ */
+static void
+sp_desktop_widget_destroy (GtkObject *object)
+{
+    SPDesktopWidget *dtw = SP_DESKTOP_WIDGET (object);
+
+    if (dtw->desktop) {
+        dtw->layer_selector->unreference();
+        inkscape_remove_desktop (dtw->desktop); // clears selection too
+        sp_signal_disconnect_by_data (G_OBJECT (dtw->desktop->namedview), dtw);
+        dtw->desktop->destroy();
+        Inkscape::GC::release (dtw->desktop);
+        dtw->desktop = NULL;
+    }
+
+    if (GTK_OBJECT_CLASS (dtw_parent_class)->destroy) {
+        (* GTK_OBJECT_CLASS (dtw_parent_class)->destroy) (object);
+    }
+}
+
+
+/**
+ * Set the title in the desktop-window (if desktop has an own window).
+ * 
+ * The title has form file name: desktop number - Inkscape.
+ * The desktop number is only shown if it's 2 or higher,
+ */
+void
+SPDesktopWidget::updateTitle(gchar const* uri)
+{
+    GtkWindow *window = GTK_WINDOW (gtk_object_get_data (GTK_OBJECT(this), "window"));
+    if (window) {
+        gchar const *fname = ( TRUE
+                               ? uri
+                               : g_basename(uri) );
+        GString *name = g_string_new ("");
+        if (this->desktop->number > 1) {
+            g_string_printf (name, _("%s: %d - Inkscape"), fname, this->desktop->number);
+        } else {
+            g_string_printf (name, _("%s - Inkscape"), fname);
+        }
+        gtk_window_set_title (window, name->str);
+        g_string_free (name, TRUE);
+    }
+}
+
+/**
+ * Callback to allocate space for desktop widget.
+ */
+static void
+sp_desktop_widget_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
+{
+    SPDesktopWidget *dtw = SP_DESKTOP_WIDGET (widget);
+
+    if ((allocation->x == widget->allocation.x) &&
+        (allocation->y == widget->allocation.y) &&
+        (allocation->width == widget->allocation.width) &&
+        (allocation->height == widget->allocation.height)) {
+        if (GTK_WIDGET_CLASS (dtw_parent_class)->size_allocate)
+            GTK_WIDGET_CLASS (dtw_parent_class)->size_allocate (widget, allocation);
+        return;
+    }
+
+    if (GTK_WIDGET_REALIZED (widget)) {
+        NR::Rect const area = dtw->desktop->get_display_area();
+        double zoom = dtw->desktop->current_zoom();
+
+        if (GTK_WIDGET_CLASS(dtw_parent_class)->size_allocate) {
+            GTK_WIDGET_CLASS(dtw_parent_class)->size_allocate (widget, allocation);
+        }
+
+        if (SP_BUTTON_IS_DOWN(dtw->sticky_zoom)) {
+            /* Calculate zoom per pixel */
+            double const zpsp = zoom / hypot (area.dimensions()[NR::X], area.dimensions()[NR::Y]);
+            /* Find new visible area */
+            NR::Rect newarea = dtw->desktop->get_display_area();
+            /* Calculate adjusted zoom */
+            zoom = zpsp * hypot(newarea.dimensions()[NR::X], newarea.dimensions()[NR::Y]);
+            dtw->desktop->zoom_absolute(newarea.midpoint()[NR::X], newarea.midpoint()[NR::Y], zoom);
+        } else {
+            dtw->desktop->zoom_absolute(area.midpoint()[NR::X], area.midpoint()[NR::Y], zoom);
+        }
+
+    } else {
+        if (GTK_WIDGET_CLASS (dtw_parent_class)->size_allocate) {
+            GTK_WIDGET_CLASS (dtw_parent_class)->size_allocate (widget, allocation);
+        }
+//            this->size_allocate (widget, allocation);
+    }
+}
+
+/**
+ * Callback to realize desktop widget.
+ */
+static void
+sp_desktop_widget_realize (GtkWidget *widget)
+{
+
+    SPDesktopWidget *dtw = SP_DESKTOP_WIDGET (widget);
+
+    if (GTK_WIDGET_CLASS (dtw_parent_class)->realize)
+        (* GTK_WIDGET_CLASS (dtw_parent_class)->realize) (widget);
+
+    NRRect d;
+    d.x0 = 0.0;
+    d.y0 = 0.0;
+    d.x1 = sp_document_width (dtw->desktop->doc());
+    d.y1 = sp_document_height (dtw->desktop->doc());
+
+    if ((fabs (d.x1 - d.x0) < 1.0) || (fabs (d.y1 - d.y0) < 1.0)) return;
+
+    dtw->desktop->set_display_area (d.x0, d.y0, d.x1, d.y1, 10);
+
+    /* Listen on namedview modification */
+    g_signal_connect (G_OBJECT (dtw->desktop->namedview), "modified", G_CALLBACK (sp_desktop_widget_namedview_modified), dtw);
+    sp_desktop_widget_namedview_modified (dtw->desktop->namedview, SP_OBJECT_MODIFIED_FLAG, dtw);
+
+    dtw->updateTitle(SP_DOCUMENT_NAME (dtw->desktop->doc()));
+}
+
+/**
+ * Callback to handle desktop widget event.
+ */
+static gint
+sp_desktop_widget_event (GtkWidget *widget, GdkEvent *event, SPDesktopWidget *dtw)
+{
+    if (event->type == GDK_BUTTON_PRESS) {
+        // defocus any spinbuttons
+        gtk_widget_grab_focus (GTK_WIDGET(dtw->canvas));
+    }
+
+    if ((event->type == GDK_BUTTON_PRESS) && (event->button.button == 3)) {
+        if (event->button.state & GDK_SHIFT_MASK) {
+            sp_canvas_arena_set_sticky (SP_CANVAS_ARENA (dtw->desktop->drawing), TRUE);
+        } else {
+            sp_canvas_arena_set_sticky (SP_CANVAS_ARENA (dtw->desktop->drawing), FALSE);
+        }
+    }
+
+    if (GTK_WIDGET_CLASS (dtw_parent_class)->event) {
+        return (* GTK_WIDGET_CLASS (dtw_parent_class)->event) (widget, event);
+    } else {
+        // The keypress events need to be passed to desktop handler explicitly,
+        // because otherwise the event contexts only receive keypresses when the mouse cursor
+        // is over the canvas. This redirection is only done for keypresses 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 && !dtw->canvas->current_item) {
+            return sp_desktop_root_handler (NULL, event, dtw->desktop);
+        }
+    }
+
+    return FALSE;
+}
+
+void
+sp_dtw_desktop_activate (SPDesktopWidget *dtw)
+{
+    /* update active desktop indicator */
+}
+
+void
+sp_dtw_desktop_deactivate (SPDesktopWidget *dtw)
+{
+    /* update inactive desktop indicator */
+}
+
+/**
+ *  Shuts down the desktop object for the view being closed.  It checks
+ *  to see if the document has been edited, and if so prompts the user
+ *  to save, discard, or cancel.  Returns TRUE if the shutdown operation
+ *  is cancelled or if the save is cancelled or fails, FALSE otherwise.
+ */
+bool 
+SPDesktopWidget::shutdown()
+{
+    g_assert(desktop != NULL);
+    if (inkscape_is_sole_desktop_for_document(*desktop)) {
+        SPDocument *doc = desktop->doc();
+        if (sp_document_repr_root(doc)->attribute("sodipodi:modified") != NULL) {
+            GtkWidget *dialog;
+
+            dialog = gtk_message_dialog_new(
+                GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(this))),
+                GTK_DIALOG_DESTROY_WITH_PARENT,
+                GTK_MESSAGE_WARNING,
+                GTK_BUTTONS_NONE,
+                "Document modified");
+
+            gchar *markup;
+            /** \todo
+             * FIXME !!! obviously this will have problems if the document 
+             * name contains markup characters
+             */
+            markup = g_strdup_printf(
+                _("<span weight=\"bold\" size=\"larger\">Save changes to document \"%s\" before closing?</span>\n\n"
+                  "If you close without saving, your changes will be discarded."),
+                SP_DOCUMENT_NAME(doc));
+
+            /** \todo
+             * FIXME !!! Gtk 2.3+ gives us gtk_message_dialog_set_markup() 
+             * (and actually even 
+             * gtk_message_dialog_new_with_markup(..., format, ...)!) -- 
+             * until then, we will have to be a little bit evil here and 
+             * poke at GtkMessageDialog::label, which is private... 
+             */
+
+            gtk_label_set_markup(GTK_LABEL(GTK_MESSAGE_DIALOG(dialog)->label), markup);
+            g_free(markup);
+
+            GtkWidget *close_button;
+            close_button = gtk_button_new_with_mnemonic(_("Close _without saving"));
+            gtk_widget_show(close_button);
+            gtk_dialog_add_action_widget(GTK_DIALOG(dialog), close_button, GTK_RESPONSE_NO);
+
+            gtk_dialog_add_button(GTK_DIALOG(dialog), GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL);
+            gtk_dialog_add_button(GTK_DIALOG(dialog), GTK_STOCK_SAVE, GTK_RESPONSE_YES);
+            gtk_dialog_set_default_response(GTK_DIALOG(dialog), GTK_RESPONSE_YES);
+
+            gint response;
+            response = gtk_dialog_run(GTK_DIALOG(dialog));
+            gtk_widget_destroy(dialog);
+
+            switch (response) {
+            case GTK_RESPONSE_YES:
+                sp_document_ref(doc);
+                if (sp_file_save_document(doc)) {
+                    sp_document_unref(doc);
+                } else { // save dialog cancelled or save failed
+                    sp_document_unref(doc);
+                    return TRUE;
+                }
+                break;
+            case GTK_RESPONSE_NO:
+                break;
+            default: // cancel pressed, or dialog was closed
+                return TRUE;
+                break;
+            }
+        }
+        /* Code to check data loss */
+        bool allow_data_loss = FALSE;
+        while (sp_document_repr_root(doc)->attribute("inkscape:dataloss") != NULL && allow_data_loss == FALSE) {
+            GtkWidget *dialog;
+
+            dialog = gtk_message_dialog_new(
+                GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(this))),
+                GTK_DIALOG_DESTROY_WITH_PARENT,
+                GTK_MESSAGE_WARNING,
+                GTK_BUTTONS_NONE,
+                "Document modified");
+
+            gchar *markup;
+            /** \todo 
+             * FIXME !!! obviously this will have problems if the document 
+             * name contains markup characters
+             */
+            markup = g_strdup_printf(
+                _("<span weight=\"bold\" size=\"larger\">The file \"%s\" was saved with a format (%s) that may cause data loss!</span>\n\n"
+                  "Do you want to save this file in another format?"),
+                SP_DOCUMENT_NAME(doc),
+                Inkscape::Extension::db.get(sp_document_repr_root(doc)->attribute("inkscape:output_extension"))->get_name());
+
+            /** \todo
+             * FIXME !!! Gtk 2.3+ gives us gtk_message_dialog_set_markup() 
+             * (and actually even 
+             * gtk_message_dialog_new_with_markup(..., format, ...)!) -- 
+             * until then, we will have to be a little bit evil here and 
+             * poke at GtkMessageDialog::label, which is private... 
+             */
+
+            gtk_label_set_markup(GTK_LABEL(GTK_MESSAGE_DIALOG(dialog)->label), markup);
+            g_free(markup);
+
+            GtkWidget *close_button;
+            close_button = gtk_button_new_with_mnemonic(_("Close _without saving"));
+            gtk_widget_show(close_button);
+            gtk_dialog_add_action_widget(GTK_DIALOG(dialog), close_button, GTK_RESPONSE_NO);
+
+            gtk_dialog_add_button(GTK_DIALOG(dialog), GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL);
+            gtk_dialog_add_button(GTK_DIALOG(dialog), GTK_STOCK_SAVE, GTK_RESPONSE_YES);
+            gtk_dialog_set_default_response(GTK_DIALOG(dialog), GTK_RESPONSE_YES);
+
+            gint response;
+            response = gtk_dialog_run(GTK_DIALOG(dialog));
+            gtk_widget_destroy(dialog);
+
+            switch (response) {
+            case GTK_RESPONSE_YES:
+                sp_document_ref(doc);
+                if (sp_file_save_dialog(doc)) {
+                    sp_document_unref(doc);
+                } else { // save dialog cancelled or save failed
+                    sp_document_unref(doc);
+                    return TRUE;
+                }
+                break;
+            case GTK_RESPONSE_NO:
+                allow_data_loss = TRUE;
+                break;
+            default: // cancel pressed, or dialog was closed
+                return TRUE;
+                break;
+            }
+        }
+    }
+
+    return FALSE;
+}
+
+/**
+ * \pre this->desktop->main != 0
+ */
+void 
+SPDesktopWidget::requestCanvasUpdate() {
+    gtk_widget_queue_draw (GTK_WIDGET (SP_CANVAS_ITEM (this->desktop->main)->canvas));
+}
+
+void 
+SPDesktopWidget::setCoordinateStatus(NR::Point p)
+{
+    gchar *cstr;
+    cstr=g_strdup_printf("%6.2f", dt2r * p[NR::X]);
+    gtk_label_set_text (GTK_LABEL (this->coord_status_x), cstr);
+    g_free(cstr);
+    cstr=g_strdup_printf("%6.2f", dt2r * p[NR::Y]);
+    gtk_label_set_text (GTK_LABEL (this->coord_status_y), cstr);
+    g_free(cstr);
+}
+
+void
+SPDesktopWidget::letZoomGrabFocus()
+{
+    if (zoom_status) 
+        gtk_widget_grab_focus (zoom_status);
+}
+    
+void 
+SPDesktopWidget::getWindowGeometry (gint &x, gint &y, gint &w, gint &h)
+{
+    GtkWindow *window = GTK_WINDOW (gtk_object_get_data (GTK_OBJECT(this), "window"));
+    if (window)
+    {
+        gtk_window_get_size (window, &w, &h);
+        gtk_window_get_position (window, &x, &y);
+    }
+}
+
+void
+SPDesktopWidget::setWindowPosition (NR::Point p)
+{
+    GtkWindow *window = GTK_WINDOW (gtk_object_get_data (GTK_OBJECT(this), "window"));
+    if (window)
+    {
+        gtk_window_move (window, gint(round(p[NR::X])), gint(round(p[NR::Y])));
+    }
+}
+
+void
+SPDesktopWidget::setWindowSize (gint w, gint h)
+{
+    GtkWindow *window = GTK_WINDOW (gtk_object_get_data (GTK_OBJECT(this), "window"));
+    if (window)
+    {
+        gtk_window_set_default_size (window, w, h);
+        gtk_window_reshow_with_initial_size (window);
+    }
+}
+
+/**
+ * \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.
+ */
+void
+SPDesktopWidget::setWindowTransient (void *p, int transient_policy)
+{
+#ifndef WIN32
+    GtkWindow *w =GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(this)));
+    if (w)
+    {
+        gtk_window_set_transient_for (GTK_WINDOW(p), w);
+        
+        /* 
+         * This enables "aggressive" transientization,
+         * i.e. dialogs always emerging on top when you switch documents. Note 
+         * however that this breaks "click to raise" policy of a window 
+         * manager because the switched-to document will be raised at once 
+         * (so that its transients also could raise)
+         */
+        if (transient_policy == 2)
+        
+            // without this, a transient window not always emerges on top
+            gtk_window_present (w); 
+    }
+#endif
+}
+
+void
+SPDesktopWidget::presentWindow()
+{
+    GtkWindow *w =GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(this)));
+    if (w)
+        gtk_window_present (w); 
+}
+
+bool
+SPDesktopWidget::warnDialog (gchar* text)
+{
+    GtkWindow *w =GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(this)));
+    if (w)
+    {
+        GtkWidget *dialog = gtk_message_dialog_new(
+                w,
+                GTK_DIALOG_DESTROY_WITH_PARENT,
+                GTK_MESSAGE_WARNING,
+                GTK_BUTTONS_YES_NO,
+                text);
+        gint response = gtk_dialog_run(GTK_DIALOG(dialog));
+        gtk_widget_destroy(dialog);
+        if (response == GTK_RESPONSE_YES)
+            return true;
+    }
+    return false;
+}
+
+void
+sp_desktop_widget_fullscreen(SPDesktopWidget *dtw)
+{
+#ifdef HAVE_GTK_WINDOW_FULLSCREEN
+    GtkWindow *topw = GTK_WINDOW(gtk_widget_get_toplevel(GTK_WIDGET(dtw->canvas)));
+    if (GTK_IS_WINDOW(topw)) {
+        if (dtw->desktop->is_fullscreen) {
+            dtw->desktop->is_fullscreen = FALSE;
+            gtk_window_unfullscreen(topw);
+            sp_desktop_widget_layout (dtw);
+        } else {
+            dtw->desktop->is_fullscreen = TRUE;
+            gtk_window_fullscreen(topw);
+            sp_desktop_widget_layout (dtw);
+        }
+    }
+#endif /* HAVE_GTK_WINDOW_FULLSCREEN */
+}
+
+/**
+ * Hide whatever the user does not want to see in the window
+ */
+void
+sp_desktop_widget_layout (SPDesktopWidget *dtw)
+{
+    bool fullscreen = dtw->desktop->is_fullscreen;
+
+    if (prefs_get_int_attribute (fullscreen ? "fullscreen.menu" : "window.menu", "state", 1) == 0) {
+        gtk_widget_hide_all (dtw->menubar);
+    } else {
+        gtk_widget_show_all (dtw->menubar);
+    }
+
+    if (prefs_get_int_attribute (fullscreen ? "fullscreen.commands" : "window.commands", "state", 1) == 0) {
+        gtk_widget_hide_all (dtw->commands_toolbox);
+    } else {
+        gtk_widget_show_all (dtw->commands_toolbox);
+    }
+
+    if (prefs_get_int_attribute (fullscreen ? "fullscreen.toppanel" : "window.toppanel", "state", 1) == 0) {
+        gtk_widget_hide_all (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
+        show_aux_toolbox (dtw->aux_toolbox);
+    }
+
+    if (prefs_get_int_attribute (fullscreen ? "fullscreen.toolbox" : "window.toolbox", "state", 1) == 0) {
+        gtk_widget_hide_all (dtw->tool_toolbox);
+    } else {
+        gtk_widget_show_all (dtw->tool_toolbox);
+    }
+
+    if (prefs_get_int_attribute (fullscreen ? "fullscreen.statusbar" : "window.statusbar", "state", 1) == 0) {
+        gtk_widget_hide_all (dtw->statusbar);
+    } else {
+        gtk_widget_show_all (dtw->statusbar);
+    }
+
+    if (prefs_get_int_attribute (fullscreen ? "fullscreen.panels" : "window.panels", "state", 1) == 0) {
+        gtk_widget_hide_all( dtw->panels );
+        GList* kids = gtk_container_get_children( GTK_CONTAINER( dtw->statusbar ) );
+        if ( kids )
+        {
+            GList* last = g_list_last( kids );
+            if ( last )
+            {
+                GtkStatusbar* tail = GTK_STATUSBAR( last->data );
+                gtk_statusbar_set_has_resize_grip( tail, TRUE );
+            }
+            g_list_free( kids );
+        }
+    } else {
+        gtk_widget_show_all( dtw->panels );
+        GList* kids = gtk_container_get_children( GTK_CONTAINER( dtw->statusbar ) );
+        if ( kids )
+        {
+            GList* last = g_list_last( kids );
+            if ( last )
+            {
+                GtkStatusbar* tail = GTK_STATUSBAR( last->data );
+                gtk_statusbar_set_has_resize_grip( tail, FALSE );
+            }
+            g_list_free( kids );
+        }
+    }
+
+    if (prefs_get_int_attribute (fullscreen ? "fullscreen.scrollbars" : "window.scrollbars", "state", 1) == 0) {
+        gtk_widget_hide_all (dtw->hscrollbar);
+        gtk_widget_hide_all (dtw->vscrollbar_box);
+    } else {
+        gtk_widget_show_all (dtw->hscrollbar);
+        gtk_widget_show_all (dtw->vscrollbar_box);
+    }
+
+    if (prefs_get_int_attribute (fullscreen ? "fullscreen.rulers" : "window.rulers", "state", 1) == 0) {
+        gtk_widget_hide_all (dtw->hruler);
+        gtk_widget_hide_all (dtw->vruler);
+    } else {
+        gtk_widget_show_all (dtw->hruler);
+        gtk_widget_show_all (dtw->vruler);
+    }
+}
+
+void
+SPDesktopWidget::setToolboxFocusTo (const gchar* label)
+{
+    gpointer hb = sp_search_by_data_recursive(aux_toolbox, (gpointer) label);
+    if (hb && GTK_IS_WIDGET(hb)) 
+    {
+        gtk_widget_grab_focus(GTK_WIDGET(hb));
+    }
+}
+
+void
+SPDesktopWidget::setToolboxAdjustmentValue (gchar const *id, double value)
+{
+    gpointer hb = sp_search_by_data_recursive (aux_toolbox, (gpointer) id);
+    if (hb && GTK_IS_WIDGET(hb) && GTK_IS_SPIN_BUTTON(hb)) {
+        GtkAdjustment *a = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON(hb));
+        gtk_adjustment_set_value (a, value);
+    }
+}
+
+bool
+SPDesktopWidget::isToolboxButtonActive (const gchar* id)
+{
+    GtkToggleButton *b = (GtkToggleButton *) sp_search_by_data_recursive(aux_toolbox, (gpointer) id);
+
+    return gtk_toggle_button_get_active (b) != 0;
+}
+
+SPViewWidget *
+sp_desktop_widget_new (SPNamedView *namedview)
+{
+    SPDesktopWidget *dtw = (SPDesktopWidget*)gtk_type_new (SP_TYPE_DESKTOP_WIDGET);
+
+    dtw->dt2r = 1.0 / namedview->doc_units->unittobase;
+    dtw->ruler_origin = namedview->gridorigin;
+
+    dtw->desktop = new SPDesktop();
+    dtw->stub = new SPDesktopWidget::WidgetStub (dtw);
+    dtw->desktop->registerEditWidget (dtw->stub);
+    dtw->desktop->init (namedview, dtw->canvas);
+    inkscape_add_desktop (dtw->desktop);
+
+    dtw->selected_style->setDesktop(dtw->desktop);
+
+    /* Once desktop is set, we can update rulers */
+    sp_desktop_widget_update_rulers (dtw);
+
+    sp_view_widget_set_view (SP_VIEW_WIDGET (dtw), dtw->desktop);
+
+    /* Listen on namedview modification */
+    g_signal_connect (G_OBJECT (namedview), "modified", G_CALLBACK (sp_desktop_widget_namedview_modified), dtw);
+
+    dtw->layer_selector->setDesktop(dtw->desktop);
+
+    dtw->menubar = sp_ui_main_menubar (dtw->desktop);
+    gtk_widget_show_all (dtw->menubar);
+    gtk_box_pack_start (GTK_BOX (dtw->vbox), dtw->menubar, FALSE, FALSE, 0);
+
+    sp_desktop_widget_layout (dtw);
+
+    sp_tool_toolbox_set_desktop (dtw->tool_toolbox, dtw->desktop);
+    sp_aux_toolbox_set_desktop (dtw->aux_toolbox, dtw->desktop);
+    sp_commands_toolbox_set_desktop (dtw->commands_toolbox, dtw->desktop);
+
+    return SP_VIEW_WIDGET (dtw);
+}
+
+void
+SPDesktopWidget::viewSetPosition (NR::Point p)
+{
+    NR::Point const origin = ( p - ruler_origin );
+
+    /// \todo fixme:
+    GTK_RULER(hruler)->position = origin[NR::X];
+    gtk_ruler_draw_pos (GTK_RULER (hruler));
+    GTK_RULER(vruler)->position = origin[NR::Y];
+    gtk_ruler_draw_pos (GTK_RULER (vruler));
+}
+
+void
+sp_desktop_widget_update_rulers (SPDesktopWidget *dtw)
+{
+    NR::Rect const viewbox = dtw->canvas->getViewbox();
+    double const scale = dtw->desktop->current_zoom();
+    double s = viewbox.min()[NR::X] / scale - dtw->ruler_origin[NR::X];
+    double e = viewbox.max()[NR::X] / scale - dtw->ruler_origin[NR::X];
+    gtk_ruler_set_range(GTK_RULER(dtw->hruler), s,  e, GTK_RULER(dtw->hruler)->position, (e - s));
+    s = viewbox.min()[NR::Y] / -scale - dtw->ruler_origin[NR::Y];
+    e = viewbox.max()[NR::Y] / -scale - dtw->ruler_origin[NR::Y];
+    gtk_ruler_set_range(GTK_RULER(dtw->vruler), s, e, GTK_RULER(dtw->vruler)->position, (e - s));
+}
+
+
+static void
+sp_desktop_widget_namedview_modified (SPNamedView *nv, guint flags, SPDesktopWidget *dtw)
+{
+    if (flags & SP_OBJECT_MODIFIED_FLAG) {
+        dtw->dt2r = 1.0 / nv->doc_units->unittobase;
+        dtw->ruler_origin = nv->gridorigin;
+
+        sp_ruler_set_metric (GTK_RULER (dtw->vruler), nv->getDefaultMetric());
+        sp_ruler_set_metric (GTK_RULER (dtw->hruler), nv->getDefaultMetric());
+
+        gtk_tooltips_set_tip (dtw->tt, dtw->hruler_box, gettext(sp_unit_get_plural (nv->doc_units)), NULL);
+        gtk_tooltips_set_tip (dtw->tt, dtw->vruler_box, gettext(sp_unit_get_plural (nv->doc_units)), NULL);
+
+        sp_desktop_widget_update_rulers (dtw);
+    }
+}
+
+static void
+sp_desktop_widget_adjustment_value_changed (GtkAdjustment *adj, SPDesktopWidget *dtw)
+{
+    if (dtw->update)
+        return;
+
+    dtw->update = 1;
+
+    sp_canvas_scroll_to (dtw->canvas, dtw->hadj->value, dtw->vadj->value, FALSE);
+    sp_desktop_widget_update_rulers (dtw);
+
+    dtw->update = 0;
+}
+
+/* we make the desktop window with focus active, signal is connected in interface.c */
+
+gint
+sp_desktop_widget_set_focus (GtkWidget *widget, GdkEvent *event, SPDesktopWidget *dtw)
+{
+    inkscape_activate_desktop (dtw->desktop);
+
+    /* give focus to canvas widget */
+    gtk_widget_grab_focus (GTK_WIDGET (dtw->canvas));
+
+    return FALSE;
+}
+
+static gdouble
+sp_dtw_zoom_value_to_display (gdouble value)
+{
+    return floor (pow (2, value) * 100.0 + 0.5);
+}
+
+static gdouble
+sp_dtw_zoom_display_to_value (gdouble value)
+{
+    return  log (value / 100.0) / log (2);
+}
+
+static gint
+sp_dtw_zoom_input (GtkSpinButton *spin, gdouble *new_val, gpointer data)
+{
+    gdouble new_scrolled = gtk_spin_button_get_value (spin);
+    const gchar *b = gtk_entry_get_text (GTK_ENTRY (spin));
+    gdouble new_typed = atof (b);
+
+    if (sp_dtw_zoom_value_to_display (new_scrolled) == new_typed) { // the new value is set by scrolling
+        *new_val = new_scrolled;
+    } else { // the new value is typed in
+        *new_val = sp_dtw_zoom_display_to_value (new_typed);
+    }
+
+    return TRUE;
+}
+
+static bool
+sp_dtw_zoom_output (GtkSpinButton *spin, gpointer data)
+{
+    gchar b[64];
+    g_snprintf (b, 64, "%4.0f%%", sp_dtw_zoom_value_to_display (gtk_spin_button_get_value (spin)));
+    gtk_entry_set_text (GTK_ENTRY (spin), b);
+    return TRUE;
+}
+
+static void
+sp_dtw_zoom_value_changed (GtkSpinButton *spin, gpointer data)
+{
+    double const zoom_factor = pow (2, gtk_spin_button_get_value (spin));
+
+    SPDesktopWidget *dtw = SP_DESKTOP_WIDGET (data);
+    SPDesktop *desktop = dtw->desktop;
+
+    NR::Rect const d = desktop->get_display_area();
+    g_signal_handler_block (spin, dtw->zoom_update);
+    desktop->zoom_absolute (d.midpoint()[NR::X], d.midpoint()[NR::Y], zoom_factor);
+    g_signal_handler_unblock (spin, dtw->zoom_update);
+
+    spinbutton_defocus (GTK_OBJECT (spin));
+}
+
+static void
+sp_dtw_zoom_populate_popup (GtkEntry *entry, GtkMenu *menu, gpointer data)
+{
+    GList *children, *iter;
+    GtkWidget *item;
+    SPDesktop *dt = SP_DESKTOP_WIDGET (data)->desktop;
+
+    children = gtk_container_get_children (GTK_CONTAINER (menu));
+    for ( iter = children ; iter ; iter = g_list_next (iter)) {
+        gtk_container_remove (GTK_CONTAINER (menu), GTK_WIDGET (iter->data));
+    }
+    g_list_free (children);
+
+    item = gtk_menu_item_new_with_label ("200%");
+    g_signal_connect (G_OBJECT (item), "activate", G_CALLBACK (sp_dtw_zoom_200), dt);
+    gtk_widget_show (item);
+    gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
+    item = gtk_menu_item_new_with_label ("100%");
+    g_signal_connect (G_OBJECT (item), "activate", G_CALLBACK (sp_dtw_zoom_100), dt);
+    gtk_widget_show (item);
+    gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
+    item = gtk_menu_item_new_with_label ("50%");
+    g_signal_connect (G_OBJECT (item), "activate", G_CALLBACK (sp_dtw_zoom_50), dt);
+    gtk_widget_show (item);
+    gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
+
+    item = gtk_separator_menu_item_new ();
+    gtk_widget_show (item);
+    gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
+
+    item = gtk_menu_item_new_with_label (_("Page"));
+    g_signal_connect (G_OBJECT (item), "activate", G_CALLBACK (sp_dtw_zoom_page), dt);
+    gtk_widget_show (item);
+    gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
+    item = gtk_menu_item_new_with_label (_("Drawing"));
+    g_signal_connect (G_OBJECT (item), "activate", G_CALLBACK (sp_dtw_zoom_drawing), dt);
+    gtk_widget_show (item);
+    gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
+    item = gtk_menu_item_new_with_label (_("Selection"));
+    g_signal_connect (G_OBJECT (item), "activate", G_CALLBACK (sp_dtw_zoom_selection), dt);
+    gtk_widget_show (item);
+    gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
+}
+
+static void
+sp_dtw_zoom_menu_handler (SPDesktop *dt, gdouble factor)
+{
+    NR::Rect const d = dt->get_display_area();
+    dt->zoom_absolute(d.midpoint()[NR::X], d.midpoint()[NR::Y], factor);
+}
+
+static void
+sp_dtw_zoom_50 (GtkMenuItem *item, gpointer data)
+{
+    sp_dtw_zoom_menu_handler (static_cast<SPDesktop*>(data), 0.5);
+}
+
+static void
+sp_dtw_zoom_100 (GtkMenuItem *item, gpointer data)
+{
+    sp_dtw_zoom_menu_handler (static_cast<SPDesktop*>(data), 1.0);
+}
+
+static void
+sp_dtw_zoom_200 (GtkMenuItem *item, gpointer data)
+{
+    sp_dtw_zoom_menu_handler (static_cast<SPDesktop*>(data), 2.0);
+}
+
+static void
+sp_dtw_zoom_page (GtkMenuItem *item, gpointer data)
+{
+    static_cast<SPDesktop*>(data)->zoom_page();
+}
+
+static void
+sp_dtw_zoom_drawing (GtkMenuItem *item, gpointer data)
+{
+    static_cast<SPDesktop*>(data)->zoom_drawing();
+}
+
+static void
+sp_dtw_zoom_selection (GtkMenuItem *item, gpointer data)
+{
+    static_cast<SPDesktop*>(data)->zoom_selection();
+}
+
+
+
+void
+sp_desktop_widget_update_zoom (SPDesktopWidget *dtw)
+{
+    g_signal_handlers_block_by_func (G_OBJECT (dtw->zoom_status), (gpointer)G_CALLBACK (sp_dtw_zoom_value_changed), dtw);
+    gtk_spin_button_set_value (GTK_SPIN_BUTTON (dtw->zoom_status), log(dtw->desktop->current_zoom()) / log(2));
+    g_signal_handlers_unblock_by_func (G_OBJECT (dtw->zoom_status), (gpointer)G_CALLBACK (sp_dtw_zoom_value_changed), dtw);
+}
+
+void
+sp_desktop_widget_toggle_rulers (SPDesktopWidget *dtw)
+{
+    if (GTK_WIDGET_VISIBLE (dtw->hruler)) {
+        gtk_widget_hide_all (dtw->hruler);
+        gtk_widget_hide_all (dtw->vruler);
+        prefs_set_int_attribute (dtw->desktop->is_fullscreen ? "fullscreen.rulers" : "window.rulers", "state", 0);
+    } else {
+        gtk_widget_show_all (dtw->hruler);
+        gtk_widget_show_all (dtw->vruler);
+        prefs_set_int_attribute (dtw->desktop->is_fullscreen ? "fullscreen.rulers" : "window.rulers", "state", 1);
+    }
+}
+
+void
+sp_desktop_widget_toggle_scrollbars (SPDesktopWidget *dtw)
+{
+    if (GTK_WIDGET_VISIBLE (dtw->hscrollbar)) {
+        gtk_widget_hide_all (dtw->hscrollbar);
+        gtk_widget_hide_all (dtw->vscrollbar_box);
+        prefs_set_int_attribute (dtw->desktop->is_fullscreen ? "fullscreen.scrollbars" : "window.scrollbars", "state", 0);
+    } else {
+        gtk_widget_show_all (dtw->hscrollbar);
+        gtk_widget_show_all (dtw->vscrollbar_box);
+        prefs_set_int_attribute (dtw->desktop->is_fullscreen ? "fullscreen.scrollbars" : "window.scrollbars", "state", 1);
+    }
+}
+
+/* Unused
+void
+sp_spw_toggle_menubar (SPDesktopWidget *dtw, bool is_fullscreen)
+{
+    if (GTK_WIDGET_VISIBLE (dtw->menubar)) {
+        gtk_widget_hide_all (dtw->menubar);
+        prefs_set_int_attribute (is_fullscreen ? "fullscreen.menu" : "window.menu", "state", 0);
+    } else {
+        gtk_widget_show_all (dtw->menubar);
+        prefs_set_int_attribute (is_fullscreen ? "fullscreen.menu" : "window.menu", "state", 1);
+    }
+}
+*/
+
+static void
+set_adjustment (GtkAdjustment *adj, double l, double u, double ps, double si, double pi)
+{
+    if ((l != adj->lower) ||
+        (u != adj->upper) ||
+        (ps != adj->page_size) ||
+        (si != adj->step_increment) ||
+        (pi != adj->page_increment)) {
+        adj->lower = l;
+        adj->upper = u;
+        adj->page_size = ps;
+        adj->step_increment = si;
+        adj->page_increment = pi;
+        gtk_adjustment_changed (adj);
+    }
+}
+
+void
+sp_desktop_widget_update_scrollbars (SPDesktopWidget *dtw, double scale)
+{
+    if (!dtw) return;
+    if (dtw->update) return;
+    dtw->update = 1;
+
+    /* The desktop region we always show unconditionally */
+    SPDocument *doc = dtw->desktop->doc();
+    NR::Rect const r = sp_item_bbox_desktop(SP_ITEM(SP_DOCUMENT_ROOT(doc)));
+    NR::Rect darea(NR::Point(MIN(r.min()[NR::X], -sp_document_width(doc)),
+                             MIN(r.min()[NR::Y], -sp_document_height(doc))),
+                   NR::Point(MAX(r.max()[NR::X], 2 * sp_document_width(doc)),
+                             MAX(r.max()[NR::Y], 2 * sp_document_height(doc))));
+
+    /* Canvas region we always show unconditionally */
+    NR::Rect carea(NR::Point(darea.min()[NR::X] * scale - 64,
+                             darea.max()[NR::Y] * -scale - 64),
+                   NR::Point(darea.max()[NR::X] * scale + 64,
+                             darea.min()[NR::Y] * -scale + 64));
+
+    NR::Rect viewbox = dtw->canvas->getViewbox();
+
+    /* Viewbox is always included into scrollable region */
+    carea = NR::Rect::union_bounds(carea, viewbox);
+
+    set_adjustment(dtw->hadj, carea.min()[NR::X], carea.max()[NR::X],
+                   viewbox.dimensions()[NR::X],
+                   0.1 * viewbox.dimensions()[NR::X],
+                   viewbox.dimensions()[NR::X]);
+    gtk_adjustment_set_value(dtw->hadj, viewbox.min()[NR::X]);
+
+    set_adjustment(dtw->vadj, carea.min()[NR::Y], carea.max()[NR::Y],
+                   viewbox.dimensions()[NR::Y],
+                   0.1 * viewbox.dimensions()[NR::Y],
+                   viewbox.dimensions()[NR::Y]);
+    gtk_adjustment_set_value(dtw->vadj, viewbox.min()[NR::Y]);
+
+    dtw->update = 0;
+}
+
+
+/*
+  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 :