Adding upstream version 3.38.2.upstream/3.38.2upstream

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

1 files changed, 4149 insertions, 0 deletions

diff --git a/eel/eel-canvas.c b/eel/eel-canvas.c
new file mode 100644
index 0000000..de3902f
--- /dev/null
+++ b/eel/eel-canvas.c
@@ -0,0 +1,4149 @@
+/*
+ * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
+ * All rights reserved.
+ *
+ * This file is part of the Gnome Library.
+ *
+ * The Gnome Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * The Gnome Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with the Gnome Library; see the file COPYING.LIB.  If not,
+ * see <http://www.gnu.org/licenses/>.
+ */
+/*
+ *  @NOTATION@
+ */
+/*
+ * EelCanvas widget - Tk-like canvas widget for Gnome
+ *
+ * EelCanvas is basically a port of the Tk toolkit's most excellent canvas widget.  Tk is
+ * copyrighted by the Regents of the University of California, Sun Microsystems, and other parties.
+ *
+ *
+ * Authors: Federico Mena <federico@nuclecu.unam.mx>
+ *          Raph Levien <raph@gimp.org>
+ */
+
+/*
+ * TO-DO list for the canvas:
+ *
+ * - Allow to specify whether EelCanvasImage sizes are in units or pixels (scale or don't scale).
+ *
+ * - GC put functions for items.
+ *
+ * - Widget item (finish it).
+ *
+ * - GList *eel_canvas_gimme_all_items_contained_in_this_area (EelCanvas *canvas, Rectangle area);
+ *
+ * - Retrofit all the primitive items with microtile support.
+ *
+ * - Curve support for line item.
+ *
+ * - Arc item (Havoc has it; to be integrated in EelCanvasEllipse).
+ *
+ * - Sane font handling API.
+ *
+ * - Get_arg methods for items:
+ *   - How to fetch the outline width and know whether it is in pixels or units?
+ */
+
+#include <config.h>
+
+#include <math.h>
+#include <string.h>
+#include <stdio.h>
+#include <gtk/gtk.h>
+#include <glib/gi18n-lib.h>
+#include <cairo-gobject.h>
+#include "eel-canvas.h"
+
+static void eel_canvas_request_update (EelCanvas *canvas);
+static void group_add (EelCanvasGroup *group,
+                       EelCanvasItem  *item);
+static void group_remove (EelCanvasGroup *group,
+                          EelCanvasItem  *item);
+static void redraw_and_repick_if_mapped (EelCanvasItem *item);
+
+/*** EelCanvasItem ***/
+
+/* Some convenience stuff */
+#define GCI_UPDATE_MASK (EEL_CANVAS_UPDATE_REQUESTED | EEL_CANVAS_UPDATE_DEEP)
+
+enum
+{
+    ITEM_PROP_0,
+    ITEM_PROP_VISIBLE
+};
+
+enum
+{
+    ITEM_DESTROY,
+    ITEM_EVENT,
+    ITEM_LAST_SIGNAL
+};
+
+static void eel_canvas_item_class_init (EelCanvasItemClass *klass);
+static void eel_canvas_item_init (EelCanvasItem *item);
+static int  emit_event (EelCanvas *canvas,
+                        GdkEvent  *event);
+
+static guint item_signals[ITEM_LAST_SIGNAL];
+
+static GObjectClass *item_parent_class;
+
+static gpointer accessible_item_parent_class;
+static gpointer accessible_parent_class;
+
+
+/**
+ * eel_canvas_item_get_type:
+ *
+ * Registers the &EelCanvasItem class if necessary, and returns the type ID
+ * associated to it.
+ *
+ * Return value:  The type ID of the &EelCanvasItem class.
+ **/
+GType
+eel_canvas_item_get_type (void)
+{
+    static GType canvas_item_type = 0;
+
+    if (!canvas_item_type)
+    {
+        static const GTypeInfo canvas_item_info =
+        {
+            sizeof (EelCanvasItemClass),
+            (GBaseInitFunc) NULL,
+            (GBaseFinalizeFunc) NULL,
+            (GClassInitFunc) eel_canvas_item_class_init,
+            NULL,                       /* class_finalize */
+            NULL,                       /* class_data */
+            sizeof (EelCanvasItem),
+            0,                          /* n_preallocs */
+            (GInstanceInitFunc) eel_canvas_item_init
+        };
+
+        canvas_item_type = g_type_register_static (G_TYPE_INITIALLY_UNOWNED,
+                                                   "EelCanvasItem",
+                                                   &canvas_item_info,
+                                                   0);
+    }
+
+    return canvas_item_type;
+}
+
+/* Object initialization function for EelCanvasItem */
+static void
+eel_canvas_item_init (EelCanvasItem *item)
+{
+    item->flags |= EEL_CANVAS_ITEM_VISIBLE;
+}
+
+/* Performs post-creation operations on a canvas item (adding it to its parent
+ * group, etc.)
+ */
+static void
+item_post_create_setup (EelCanvasItem *item)
+{
+    group_add (EEL_CANVAS_GROUP (item->parent), item);
+
+    redraw_and_repick_if_mapped (item);
+}
+
+/**
+ * eel_canvas_item_new:
+ * @parent: The parent group for the new item.
+ * @type: The object type of the item.
+ * @first_arg_name: A list of object argument name/value pairs, NULL-terminated,
+ * used to configure the item.  For example, "fill_color", "black",
+ * "width_units", 5.0, NULL.
+ * @Varargs:
+ *
+ * Creates a new canvas item with @parent as its parent group.  The item is
+ * created at the top of its parent's stack, and starts up as visible.  The item
+ * is of the specified @type, for example, it can be
+ * eel_canvas_rect_get_type().  The list of object arguments/value pairs is
+ * used to configure the item.
+ *
+ * Return value: The newly-created item.
+ **/
+EelCanvasItem *
+eel_canvas_item_new (EelCanvasGroup *parent,
+                     GType           type,
+                     const gchar    *first_arg_name,
+                     ...)
+{
+    EelCanvasItem *item;
+    va_list args;
+
+    g_return_val_if_fail (EEL_IS_CANVAS_GROUP (parent), NULL);
+    g_return_val_if_fail (g_type_is_a (type, eel_canvas_item_get_type ()), NULL);
+
+    item = EEL_CANVAS_ITEM (g_object_new (type, NULL));
+
+    item->parent = EEL_CANVAS_ITEM (parent);
+    item->canvas = item->parent->canvas;
+
+    va_start (args, first_arg_name);
+    g_object_set_valist (G_OBJECT (item), first_arg_name, args);
+    va_end (args);
+
+    item_post_create_setup (item);
+
+    return item;
+}
+
+/* Set_property handler for canvas items */
+static void
+eel_canvas_item_set_property (GObject      *gobject,
+                              guint         param_id,
+                              const GValue *value,
+                              GParamSpec   *pspec)
+{
+    EelCanvasItem *item;
+
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (gobject));
+
+    item = EEL_CANVAS_ITEM (gobject);
+
+    switch (param_id)
+    {
+        case ITEM_PROP_VISIBLE:
+        {
+            if (g_value_get_boolean (value))
+            {
+                eel_canvas_item_show (item);
+            }
+            else
+            {
+                eel_canvas_item_hide (item);
+            }
+        }
+        break;
+
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec);
+        }
+        break;
+    }
+}
+
+/* Get_property handler for canvas items */
+static void
+eel_canvas_item_get_property (GObject    *gobject,
+                              guint       param_id,
+                              GValue     *value,
+                              GParamSpec *pspec)
+{
+    EelCanvasItem *item;
+
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (gobject));
+
+    item = EEL_CANVAS_ITEM (gobject);
+
+    switch (param_id)
+    {
+        case ITEM_PROP_VISIBLE:
+        {
+            g_value_set_boolean (value, item->flags & EEL_CANVAS_ITEM_VISIBLE);
+        }
+        break;
+
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec);
+        }
+        break;
+    }
+}
+
+static void
+redraw_and_repick_if_mapped (EelCanvasItem *item)
+{
+    if (item->flags & EEL_CANVAS_ITEM_MAPPED)
+    {
+        eel_canvas_item_request_redraw (item);
+        item->canvas->need_repick = TRUE;
+    }
+}
+
+/* Dispose handler for canvas items */
+static void
+eel_canvas_item_dispose (GObject *object)
+{
+    EelCanvasItem *item;
+
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (object));
+
+    item = EEL_CANVAS_ITEM (object);
+
+    if (item->canvas)
+    {
+        eel_canvas_item_request_redraw (item);
+
+        /* Make the canvas forget about us */
+
+        if (item == item->canvas->current_item)
+        {
+            item->canvas->current_item = NULL;
+            item->canvas->need_repick = TRUE;
+        }
+
+        if (item == item->canvas->new_current_item)
+        {
+            item->canvas->new_current_item = NULL;
+            item->canvas->need_repick = TRUE;
+        }
+
+        eel_canvas_item_ungrab (item);
+
+        if (item == item->canvas->focused_item)
+        {
+            item->canvas->focused_item = NULL;
+        }
+
+        /* Normal destroy stuff */
+
+        if (item->flags & EEL_CANVAS_ITEM_MAPPED)
+        {
+            (*EEL_CANVAS_ITEM_GET_CLASS (item)->unmap)(item);
+        }
+
+        if (item->flags & EEL_CANVAS_ITEM_REALIZED)
+        {
+            (*EEL_CANVAS_ITEM_GET_CLASS (item)->unrealize)(item);
+        }
+
+        if (item->parent)
+        {
+            group_remove (EEL_CANVAS_GROUP (item->parent), item);
+        }
+
+        item->canvas = NULL;
+    }
+
+    g_object_set_data (object, "in-destruction", GINT_TO_POINTER (1));
+    g_signal_emit (object, item_signals[ITEM_DESTROY], 0);
+
+    g_object_set_data (object, "in-destruction", NULL);
+
+    G_OBJECT_CLASS (item_parent_class)->dispose (object);
+}
+
+void
+eel_canvas_item_destroy (EelCanvasItem *item)
+{
+    if (g_object_get_data (G_OBJECT (item), "in-destruction") == NULL)
+    {
+        g_object_run_dispose (G_OBJECT (item));
+    }
+}
+
+/* Realize handler for canvas items */
+static void
+eel_canvas_item_realize (EelCanvasItem *item)
+{
+    if (item->parent && !(item->parent->flags & EEL_CANVAS_ITEM_REALIZED))
+    {
+        (*EEL_CANVAS_ITEM_GET_CLASS (item->parent)->realize)(item->parent);
+    }
+
+    if (item->parent == NULL && !gtk_widget_get_realized (GTK_WIDGET (item->canvas)))
+    {
+        gtk_widget_realize (GTK_WIDGET (item->canvas));
+    }
+
+    item->flags |= EEL_CANVAS_ITEM_REALIZED;
+
+    eel_canvas_item_request_update (item);
+}
+
+/* Unrealize handler for canvas items */
+static void
+eel_canvas_item_unrealize (EelCanvasItem *item)
+{
+    if (item->flags & EEL_CANVAS_ITEM_MAPPED)
+    {
+        (*EEL_CANVAS_ITEM_GET_CLASS (item)->unmap)(item);
+    }
+
+    item->flags &= ~(EEL_CANVAS_ITEM_REALIZED);
+}
+
+/* Map handler for canvas items */
+static void
+eel_canvas_item_map (EelCanvasItem *item)
+{
+    item->flags |= EEL_CANVAS_ITEM_MAPPED;
+}
+
+/* Unmap handler for canvas items */
+static void
+eel_canvas_item_unmap (EelCanvasItem *item)
+{
+    item->flags &= ~(EEL_CANVAS_ITEM_MAPPED);
+}
+
+/* Update handler for canvas items */
+static void
+eel_canvas_item_update (EelCanvasItem *item,
+                        double         i2w_dx,
+                        double         i2w_dy,
+                        int            flags)
+{
+    item->flags &= ~(EEL_CANVAS_ITEM_NEED_UPDATE);
+    item->flags &= ~(EEL_CANVAS_ITEM_NEED_DEEP_UPDATE);
+}
+
+/*
+ * This routine invokes the update method of the item
+ * Please notice, that we take parent to canvas pixel matrix as argument
+ * unlike virtual method ::update, whose argument is item 2 canvas pixel
+ * matrix
+ *
+ * I will try to force somewhat meaningful naming for affines (Lauris)
+ * General naming rule is FROM2TO, where FROM and TO are abbreviations
+ * So p2cpx is Parent2CanvasPixel and i2cpx is Item2CanvasPixel
+ * I hope that this helps to keep track of what really happens
+ *
+ */
+
+static void
+eel_canvas_item_invoke_update (EelCanvasItem *item,
+                               double         i2w_dx,
+                               double         i2w_dy,
+                               int            flags)
+{
+    int child_flags;
+
+    child_flags = flags;
+
+    /* apply object flags to child flags */
+    child_flags &= ~EEL_CANVAS_UPDATE_REQUESTED;
+
+    if (item->flags & EEL_CANVAS_ITEM_NEED_UPDATE)
+    {
+        child_flags |= EEL_CANVAS_UPDATE_REQUESTED;
+    }
+
+    if (item->flags & EEL_CANVAS_ITEM_NEED_DEEP_UPDATE)
+    {
+        child_flags |= EEL_CANVAS_UPDATE_DEEP;
+    }
+
+    if (child_flags & GCI_UPDATE_MASK)
+    {
+        if (EEL_CANVAS_ITEM_GET_CLASS (item)->update)
+        {
+            EEL_CANVAS_ITEM_GET_CLASS (item)->update (item, i2w_dx, i2w_dy, child_flags);
+        }
+    }
+
+    /* If this fail you probably forgot to chain up to
+     * EelCanvasItem::update from a derived class */
+    g_return_if_fail (!(item->flags & EEL_CANVAS_ITEM_NEED_UPDATE));
+}
+
+/*
+ * This routine invokes the point method of the item.
+ * The arguments x, y should be in the parent item local coordinates.
+ */
+
+static double
+eel_canvas_item_invoke_point (EelCanvasItem  *item,
+                              double          x,
+                              double          y,
+                              int             cx,
+                              int             cy,
+                              EelCanvasItem **actual_item)
+{
+    /* Calculate x & y in item local coordinates */
+
+    if (EEL_CANVAS_ITEM_GET_CLASS (item)->point)
+    {
+        return EEL_CANVAS_ITEM_GET_CLASS (item)->point (item, x, y, cx, cy, actual_item);
+    }
+
+    return 1e18;
+}
+
+/**
+ * eel_canvas_item_set:
+ * @item: A canvas item.
+ * @first_arg_name: The list of object argument name/value pairs used to configure the item.
+ * @Varargs:
+ *
+ * Configures a canvas item.  The arguments in the item are set to the specified
+ * values, and the item is repainted as appropriate.
+ **/
+void
+eel_canvas_item_set (EelCanvasItem *item,
+                     const gchar   *first_arg_name,
+                     ...)
+{
+    va_list args;
+
+    va_start (args, first_arg_name);
+    g_object_set_valist (G_OBJECT (item), first_arg_name, args);
+    va_end (args);
+
+    item->canvas->need_repick = TRUE;
+}
+
+/**
+ * eel_canvas_item_move:
+ * @item: A canvas item.
+ * @dx: Horizontal offset.
+ * @dy: Vertical offset.
+ *
+ * Moves a canvas item by creating an affine transformation matrix for
+ * translation by using the specified values. This happens in item
+ * local coordinate system, so if you have nontrivial transform, it
+ * most probably does not do, what you want.
+ **/
+void
+eel_canvas_item_move (EelCanvasItem *item,
+                      double         dx,
+                      double         dy)
+{
+    g_return_if_fail (item != NULL);
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+
+    if (!EEL_CANVAS_ITEM_GET_CLASS (item)->translate)
+    {
+        g_warning ("Item type %s does not implement translate method.\n",
+                   g_type_name (G_OBJECT_TYPE (item)));
+        return;
+    }
+
+    (*EEL_CANVAS_ITEM_GET_CLASS (item)->translate)(item, dx, dy);
+
+    if (item->flags & EEL_CANVAS_ITEM_MAPPED)
+    {
+        item->canvas->need_repick = TRUE;
+    }
+
+    if (!(item->flags & EEL_CANVAS_ITEM_NEED_DEEP_UPDATE))
+    {
+        item->flags |= EEL_CANVAS_ITEM_NEED_DEEP_UPDATE;
+        if (item->parent != NULL)
+        {
+            eel_canvas_item_request_update (item->parent);
+        }
+        else
+        {
+            eel_canvas_request_update (item->canvas);
+        }
+    }
+}
+
+static void
+eel_canvas_queue_resize (EelCanvas *canvas)
+{
+    if (gtk_widget_is_drawable (GTK_WIDGET (canvas)))
+    {
+        gtk_widget_queue_resize (GTK_WIDGET (canvas));
+    }
+}
+
+/* Convenience function to reorder items in a group's child list.  This puts the
+ * specified link after the "before" link. Returns TRUE if the list was changed.
+ */
+static gboolean
+put_item_after (GList *link,
+                GList *before)
+{
+    EelCanvasGroup *parent;
+
+    if (link == before)
+    {
+        return FALSE;
+    }
+
+    parent = EEL_CANVAS_GROUP (EEL_CANVAS_ITEM (link->data)->parent);
+
+    if (before == NULL)
+    {
+        if (link == parent->item_list)
+        {
+            return FALSE;
+        }
+
+        link->prev->next = link->next;
+
+        if (link->next)
+        {
+            link->next->prev = link->prev;
+        }
+        else
+        {
+            parent->item_list_end = link->prev;
+        }
+
+        link->prev = before;
+        link->next = parent->item_list;
+        link->next->prev = link;
+        parent->item_list = link;
+    }
+    else
+    {
+        if ((link == parent->item_list_end) && (before == parent->item_list_end->prev))
+        {
+            return FALSE;
+        }
+
+        if (link->next)
+        {
+            link->next->prev = link->prev;
+        }
+
+        if (link->prev)
+        {
+            link->prev->next = link->next;
+        }
+        else
+        {
+            parent->item_list = link->next;
+            parent->item_list->prev = NULL;
+        }
+
+        link->prev = before;
+        link->next = before->next;
+
+        link->prev->next = link;
+
+        if (link->next)
+        {
+            link->next->prev = link;
+        }
+        else
+        {
+            parent->item_list_end = link;
+        }
+    }
+    return TRUE;
+}
+
+
+/**
+ * eel_canvas_item_raise:
+ * @item: A canvas item.
+ * @positions: Number of steps to raise the item.
+ *
+ * Raises the item in its parent's stack by the specified number of positions.
+ * If the number of positions is greater than the distance to the top of the
+ * stack, then the item is put at the top.
+ **/
+void
+eel_canvas_item_raise (EelCanvasItem *item,
+                       int            positions)
+{
+    GList *link, *before;
+    EelCanvasGroup *parent;
+
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+    g_return_if_fail (positions >= 0);
+
+    if (!item->parent || positions == 0)
+    {
+        return;
+    }
+
+    parent = EEL_CANVAS_GROUP (item->parent);
+    link = g_list_find (parent->item_list, item);
+    g_assert (link != NULL);
+
+    for (before = link; positions && before; positions--)
+    {
+        before = before->next;
+    }
+
+    if (!before)
+    {
+        before = parent->item_list_end;
+    }
+
+    if (put_item_after (link, before))
+    {
+        redraw_and_repick_if_mapped (item);
+    }
+}
+
+
+/**
+ * eel_canvas_item_lower:
+ * @item: A canvas item.
+ * @positions: Number of steps to lower the item.
+ *
+ * Lowers the item in its parent's stack by the specified number of positions.
+ * If the number of positions is greater than the distance to the bottom of the
+ * stack, then the item is put at the bottom.
+ **/
+void
+eel_canvas_item_lower (EelCanvasItem *item,
+                       int            positions)
+{
+    GList *link, *before;
+    EelCanvasGroup *parent;
+
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+    g_return_if_fail (positions >= 1);
+
+    if (!item->parent)
+    {
+        return;
+    }
+
+    parent = EEL_CANVAS_GROUP (item->parent);
+    link = g_list_find (parent->item_list, item);
+    g_assert (link != NULL);
+
+    if (link->prev)
+    {
+        for (before = link->prev; positions && before; positions--)
+        {
+            before = before->prev;
+        }
+    }
+    else
+    {
+        before = NULL;
+    }
+
+    if (put_item_after (link, before))
+    {
+        redraw_and_repick_if_mapped (item);
+    }
+}
+
+
+/**
+ * eel_canvas_item_raise_to_top:
+ * @item: A canvas item.
+ *
+ * Raises an item to the top of its parent's stack.
+ **/
+void
+eel_canvas_item_raise_to_top (EelCanvasItem *item)
+{
+    GList *link;
+    EelCanvasGroup *parent;
+
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+
+    if (!item->parent)
+    {
+        return;
+    }
+
+    parent = EEL_CANVAS_GROUP (item->parent);
+    link = g_list_find (parent->item_list, item);
+    g_assert (link != NULL);
+
+    if (put_item_after (link, parent->item_list_end))
+    {
+        redraw_and_repick_if_mapped (item);
+    }
+}
+
+
+/**
+ * eel_canvas_item_lower_to_bottom:
+ * @item: A canvas item.
+ *
+ * Lowers an item to the bottom of its parent's stack.
+ **/
+void
+eel_canvas_item_lower_to_bottom (EelCanvasItem *item)
+{
+    GList *link;
+    EelCanvasGroup *parent;
+
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+
+    if (!item->parent)
+    {
+        return;
+    }
+
+    parent = EEL_CANVAS_GROUP (item->parent);
+    link = g_list_find (parent->item_list, item);
+    g_assert (link != NULL);
+
+    if (put_item_after (link, NULL))
+    {
+        redraw_and_repick_if_mapped (item);
+    }
+}
+
+/**
+ * eel_canvas_item_send_behind:
+ * @item: A canvas item.
+ * @behind_item: The canvas item to put item behind, or NULL
+ *
+ * Moves item to a in the position in the stacking order so that
+ * it is placed immediately below behind_item, or at the top if
+ * behind_item is NULL.
+ **/
+void
+eel_canvas_item_send_behind (EelCanvasItem *item,
+                             EelCanvasItem *behind_item)
+{
+    GList *item_list;
+    int item_position, behind_position;
+
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+
+    if (behind_item == NULL)
+    {
+        eel_canvas_item_raise_to_top (item);
+        return;
+    }
+
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (behind_item));
+    g_return_if_fail (item->parent == behind_item->parent);
+
+    item_list = EEL_CANVAS_GROUP (item->parent)->item_list;
+
+    item_position = g_list_index (item_list, item);
+    g_assert (item_position != -1);
+    behind_position = g_list_index (item_list, behind_item);
+    g_assert (behind_position != -1);
+    g_assert (item_position != behind_position);
+
+    if (item_position == behind_position - 1)
+    {
+        return;
+    }
+
+    if (item_position < behind_position)
+    {
+        eel_canvas_item_raise (item, (behind_position - 1) - item_position);
+    }
+    else
+    {
+        eel_canvas_item_lower (item, item_position - behind_position);
+    }
+}
+
+/**
+ * eel_canvas_item_show:
+ * @item: A canvas item.
+ *
+ * Shows a canvas item.  If the item was already shown, then no action is taken.
+ **/
+void
+eel_canvas_item_show (EelCanvasItem *item)
+{
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+
+    if (!(item->flags & EEL_CANVAS_ITEM_VISIBLE))
+    {
+        item->flags |= EEL_CANVAS_ITEM_VISIBLE;
+
+        if (!(item->flags & EEL_CANVAS_ITEM_REALIZED))
+        {
+            (*EEL_CANVAS_ITEM_GET_CLASS (item)->realize)(item);
+        }
+
+        if (item->parent != NULL)
+        {
+            if (!(item->flags & EEL_CANVAS_ITEM_MAPPED) &&
+                item->parent->flags & EEL_CANVAS_ITEM_MAPPED)
+            {
+                (*EEL_CANVAS_ITEM_GET_CLASS (item)->map)(item);
+            }
+        }
+        else
+        {
+            if (!(item->flags & EEL_CANVAS_ITEM_MAPPED) &&
+                gtk_widget_get_mapped (GTK_WIDGET (item->canvas)))
+            {
+                (*EEL_CANVAS_ITEM_GET_CLASS (item)->map)(item);
+            }
+        }
+
+        redraw_and_repick_if_mapped (item);
+        eel_canvas_queue_resize (item->canvas);
+    }
+}
+
+
+/**
+ * eel_canvas_item_hide:
+ * @item: A canvas item.
+ *
+ * Hides a canvas item.  If the item was already hidden, then no action is
+ * taken.
+ **/
+void
+eel_canvas_item_hide (EelCanvasItem *item)
+{
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+
+    if (item->flags & EEL_CANVAS_ITEM_VISIBLE)
+    {
+        item->flags &= ~EEL_CANVAS_ITEM_VISIBLE;
+
+        redraw_and_repick_if_mapped (item);
+
+        if (item->flags & EEL_CANVAS_ITEM_MAPPED)
+        {
+            (*EEL_CANVAS_ITEM_GET_CLASS (item)->unmap)(item);
+        }
+
+        eel_canvas_queue_resize (item->canvas);
+
+        /* No need to unrealize when we just want to hide */
+    }
+}
+
+
+/*
+ * Prepare the window for grabbing, i.e. show it.
+ */
+static void
+seat_grab_prepare_window (GdkSeat   *seat,
+                          GdkWindow *window,
+                          gpointer   user_data)
+{
+    gdk_window_show (window);
+}
+
+/**
+ * eel_canvas_item_grab:
+ * @item: A canvas item.
+ * @event_mask: Mask of events that will be sent to this item.
+ * @cursor: If non-NULL, the cursor that will be used while the grab is active.
+ * @event: The event, triggering the grab, if any.
+ *
+ * Specifies that all events that match the specified event mask should be sent
+ * to the specified item, and also grabs the seat by calling gdk_seat_grab().
+ * If @cursor is not NULL, then that cursor is used while the grab is active.
+ *
+ * Return value: If an item was already grabbed, it returns %GDK_GRAB_ALREADY_GRABBED. If
+ * the specified item was hidden by calling eel_canvas_item_hide(), then it
+ * returns %GDK_GRAB_NOT_VIEWABLE. Else, it returns the result of calling
+ * gdk_seat_grab().
+ **/
+GdkGrabStatus
+eel_canvas_item_grab (EelCanvasItem  *item,
+                      GdkEventMask    event_mask,
+                      GdkCursor      *cursor,
+                      const GdkEvent *event)
+{
+    GdkGrabStatus retval;
+    GdkDisplay *display;
+    GdkSeat *seat;
+
+    g_return_val_if_fail (EEL_IS_CANVAS_ITEM (item), GDK_GRAB_NOT_VIEWABLE);
+    g_return_val_if_fail (gtk_widget_get_mapped (GTK_WIDGET (item->canvas)),
+                          GDK_GRAB_NOT_VIEWABLE);
+
+    if (item->canvas->grabbed_item)
+    {
+        return GDK_GRAB_ALREADY_GRABBED;
+    }
+
+    if (!(item->flags & EEL_CANVAS_ITEM_MAPPED))
+    {
+        return GDK_GRAB_NOT_VIEWABLE;
+    }
+
+    display = gtk_widget_get_display (GTK_WIDGET (item->canvas));
+    seat = gdk_display_get_default_seat (display);
+
+    retval = gdk_seat_grab (seat,
+                            gtk_layout_get_bin_window (GTK_LAYOUT (item->canvas)),
+                            GDK_SEAT_CAPABILITY_ALL_POINTING,
+                            FALSE,
+                            cursor,
+                            event,
+                            seat_grab_prepare_window,
+                            NULL);
+
+    if (retval != GDK_GRAB_SUCCESS)
+    {
+        return retval;
+    }
+
+    item->canvas->grabbed_item = item;
+    item->canvas->grabbed_event_mask = event_mask;
+    item->canvas->current_item = item;     /* So that events go to the grabbed item */
+
+    return retval;
+}
+
+
+/**
+ * eel_canvas_item_ungrab:
+ * @item: A canvas item that holds a grab.
+ *
+ * Ungrabs the item, which must have been grabbed in the canvas, and ungrabs the
+ * seat.
+ **/
+void
+eel_canvas_item_ungrab (EelCanvasItem *item)
+{
+    GdkDisplay *display;
+    GdkSeat *seat;
+
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+
+    if (item->canvas->grabbed_item != item)
+    {
+        return;
+    }
+
+    display = gtk_widget_get_display (GTK_WIDGET (item->canvas));
+    seat = gdk_display_get_default_seat (display);
+
+    item->canvas->grabbed_item = NULL;
+    gdk_seat_ungrab (seat);
+}
+
+/**
+ * eel_canvas_item_i2w:
+ * @item: A canvas item.
+ * @x: X coordinate to convert (input/output value).
+ * @y: Y coordinate to convert (input/output value).
+ *
+ * Converts a coordinate pair from item-relative coordinates to world
+ * coordinates.
+ **/
+void
+eel_canvas_item_i2w (EelCanvasItem *item,
+                     double        *x,
+                     double        *y)
+{
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+    g_return_if_fail (x != NULL);
+    g_return_if_fail (y != NULL);
+
+    item = item->parent;
+    while (item)
+    {
+        if (EEL_IS_CANVAS_GROUP (item))
+        {
+            *x += EEL_CANVAS_GROUP (item)->xpos;
+            *y += EEL_CANVAS_GROUP (item)->ypos;
+        }
+
+        item = item->parent;
+    }
+}
+
+/* Returns whether the item is an inferior of or is equal to the parent. */
+static int
+is_descendant (EelCanvasItem *item,
+               EelCanvasItem *parent)
+{
+    for (; item; item = item->parent)
+    {
+        if (item == parent)
+        {
+            return TRUE;
+        }
+    }
+
+    return FALSE;
+}
+
+/**
+ * eel_canvas_item_grab_focus:
+ * @item: A canvas item.
+ *
+ * Makes the specified item take the keyboard focus, so all keyboard events will
+ * be sent to it.  If the canvas widget itself did not have the focus, it grabs
+ * it as well.
+ **/
+static void
+eel_canvas_item_grab_focus (EelCanvasItem *item)
+{
+    EelCanvasItem *focused_item;
+    GdkEvent ev;
+
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+    g_return_if_fail (gtk_widget_get_can_focus (GTK_WIDGET (item->canvas)));
+
+    focused_item = item->canvas->focused_item;
+
+    if (focused_item)
+    {
+        ev.focus_change.type = GDK_FOCUS_CHANGE;
+        ev.focus_change.window = gtk_layout_get_bin_window (GTK_LAYOUT (item->canvas));
+        ev.focus_change.send_event = FALSE;
+        ev.focus_change.in = FALSE;
+
+        emit_event (item->canvas, &ev);
+    }
+
+    item->canvas->focused_item = item;
+    gtk_widget_grab_focus (GTK_WIDGET (item->canvas));
+
+    if (focused_item)
+    {
+        ev.focus_change.type = GDK_FOCUS_CHANGE;
+        ev.focus_change.window = gtk_layout_get_bin_window (GTK_LAYOUT (item->canvas));
+        ev.focus_change.send_event = FALSE;
+        ev.focus_change.in = TRUE;
+
+        emit_event (item->canvas, &ev);
+    }
+}
+
+
+/**
+ * eel_canvas_item_get_bounds:
+ * @item: A canvas item.
+ * @x1: Leftmost edge of the bounding box (return value).
+ * @y1: Upper edge of the bounding box (return value).
+ * @x2: Rightmost edge of the bounding box (return value).
+ * @y2: Lower edge of the bounding box (return value).
+ *
+ * Queries the bounding box of a canvas item.  The bounds are returned in the
+ * coordinate system of the item's parent.
+ **/
+void
+eel_canvas_item_get_bounds (EelCanvasItem *item,
+                            double        *x1,
+                            double        *y1,
+                            double        *x2,
+                            double        *y2)
+{
+    double tx1, ty1, tx2, ty2;
+
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+
+    tx1 = ty1 = tx2 = ty2 = 0.0;
+
+    /* Get the item's bounds in its coordinate system */
+
+    if (EEL_CANVAS_ITEM_GET_CLASS (item)->bounds)
+    {
+        (*EEL_CANVAS_ITEM_GET_CLASS (item)->bounds)(item, &tx1, &ty1, &tx2, &ty2);
+    }
+
+    /* Return the values */
+
+    if (x1)
+    {
+        *x1 = tx1;
+    }
+
+    if (y1)
+    {
+        *y1 = ty1;
+    }
+
+    if (x2)
+    {
+        *x2 = tx2;
+    }
+
+    if (y2)
+    {
+        *y2 = ty2;
+    }
+}
+
+
+/**
+ * eel_canvas_item_request_update
+ * @item: A canvas item.
+ *
+ * To be used only by item implementations.  Requests that the canvas queue an
+ * update for the specified item.
+ **/
+void
+eel_canvas_item_request_update (EelCanvasItem *item)
+{
+    if (NULL == item->canvas)
+    {
+        return;
+    }
+
+    g_return_if_fail (!item->canvas->doing_update);
+
+    if (item->flags & EEL_CANVAS_ITEM_NEED_UPDATE)
+    {
+        return;
+    }
+
+    item->flags |= EEL_CANVAS_ITEM_NEED_UPDATE;
+
+    if (item->parent != NULL)
+    {
+        /* Recurse up the tree */
+        eel_canvas_item_request_update (item->parent);
+    }
+    else
+    {
+        /* Have reached the top of the tree, make sure the update call gets scheduled. */
+        eel_canvas_request_update (item->canvas);
+    }
+}
+
+/**
+ * eel_canvas_item_request_update
+ * @item: A canvas item.
+ *
+ * Convenience function that informs a canvas that the specified item needs
+ * to be repainted. To be used by item implementations
+ **/
+void
+eel_canvas_item_request_redraw (EelCanvasItem *item)
+{
+    if (item->flags & EEL_CANVAS_ITEM_MAPPED)
+    {
+        eel_canvas_request_redraw (item->canvas,
+                                   item->x1, item->y1,
+                                   item->x2 + 1, item->y2 + 1);
+    }
+}
+
+
+
+/*** EelCanvasGroup ***/
+
+
+enum
+{
+    GROUP_PROP_0,
+    GROUP_PROP_X,
+    GROUP_PROP_Y
+};
+
+
+static void eel_canvas_group_class_init (EelCanvasGroupClass *klass);
+static void eel_canvas_group_init (EelCanvasGroup *group);
+static void eel_canvas_group_set_property (GObject      *object,
+                                           guint         param_id,
+                                           const GValue *value,
+                                           GParamSpec   *pspec);
+static void eel_canvas_group_get_property (GObject    *object,
+                                           guint       param_id,
+                                           GValue     *value,
+                                           GParamSpec *pspec);
+
+static void eel_canvas_group_destroy (EelCanvasItem *object);
+
+static void   eel_canvas_group_update (EelCanvasItem *item,
+                                       double         i2w_dx,
+                                       double         i2w_dy,
+                                       int            flags);
+static void   eel_canvas_group_unrealize (EelCanvasItem *item);
+static void   eel_canvas_group_map (EelCanvasItem *item);
+static void   eel_canvas_group_unmap (EelCanvasItem *item);
+static void   eel_canvas_group_draw (EelCanvasItem  *item,
+                                     cairo_t        *cr,
+                                     cairo_region_t *region);
+static double eel_canvas_group_point (EelCanvasItem  *item,
+                                      double          x,
+                                      double          y,
+                                      int             cx,
+                                      int             cy,
+                                      EelCanvasItem **actual_item);
+static void   eel_canvas_group_translate (EelCanvasItem *item,
+                                          double         dx,
+                                          double         dy);
+static void   eel_canvas_group_bounds (EelCanvasItem *item,
+                                       double        *x1,
+                                       double        *y1,
+                                       double        *x2,
+                                       double        *y2);
+
+
+static EelCanvasItemClass *group_parent_class;
+
+
+/**
+ * eel_canvas_group_get_type:
+ *
+ * Registers the &EelCanvasGroup class if necessary, and returns the type ID
+ * associated to it.
+ *
+ * Return value:  The type ID of the &EelCanvasGroup class.
+ **/
+GType
+eel_canvas_group_get_type (void)
+{
+    static GType group_type = 0;
+
+    if (!group_type)
+    {
+        static const GTypeInfo group_info =
+        {
+            sizeof (EelCanvasGroupClass),
+            (GBaseInitFunc) NULL,
+            (GBaseFinalizeFunc) NULL,
+            (GClassInitFunc) eel_canvas_group_class_init,
+            NULL,                       /* class_finalize */
+            NULL,                       /* class_data */
+            sizeof (EelCanvasGroup),
+            0,                          /* n_preallocs */
+            (GInstanceInitFunc) eel_canvas_group_init
+        };
+
+        group_type = g_type_register_static (eel_canvas_item_get_type (),
+                                             "EelCanvasGroup",
+                                             &group_info,
+                                             0);
+    }
+
+    return group_type;
+}
+
+/* Class initialization function for EelCanvasGroupClass */
+static void
+eel_canvas_group_class_init (EelCanvasGroupClass *klass)
+{
+    GObjectClass *gobject_class;
+    EelCanvasItemClass *item_class;
+
+    gobject_class = (GObjectClass *) klass;
+    item_class = (EelCanvasItemClass *) klass;
+
+    group_parent_class = g_type_class_peek_parent (klass);
+
+    gobject_class->set_property = eel_canvas_group_set_property;
+    gobject_class->get_property = eel_canvas_group_get_property;
+
+    g_object_class_install_property
+        (gobject_class, GROUP_PROP_X,
+        g_param_spec_double ("x",
+                             _("X"),
+                             _("X"),
+                             -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+                             G_PARAM_READWRITE));
+    g_object_class_install_property
+        (gobject_class, GROUP_PROP_Y,
+        g_param_spec_double ("y",
+                             _("Y"),
+                             _("Y"),
+                             -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+                             G_PARAM_READWRITE));
+
+    item_class->destroy = eel_canvas_group_destroy;
+    item_class->update = eel_canvas_group_update;
+    item_class->unrealize = eel_canvas_group_unrealize;
+    item_class->map = eel_canvas_group_map;
+    item_class->unmap = eel_canvas_group_unmap;
+    item_class->draw = eel_canvas_group_draw;
+    item_class->point = eel_canvas_group_point;
+    item_class->translate = eel_canvas_group_translate;
+    item_class->bounds = eel_canvas_group_bounds;
+}
+
+/* Object initialization function for EelCanvasGroup */
+static void
+eel_canvas_group_init (EelCanvasGroup *group)
+{
+    group->xpos = 0.0;
+    group->ypos = 0.0;
+}
+
+/* Set_property handler for canvas groups */
+static void
+eel_canvas_group_set_property (GObject      *gobject,
+                               guint         param_id,
+                               const GValue *value,
+                               GParamSpec   *pspec)
+{
+    EelCanvasItem *item;
+    EelCanvasGroup *group;
+    double old;
+    gboolean moved;
+
+    g_return_if_fail (EEL_IS_CANVAS_GROUP (gobject));
+
+    item = EEL_CANVAS_ITEM (gobject);
+    group = EEL_CANVAS_GROUP (gobject);
+
+    moved = FALSE;
+    switch (param_id)
+    {
+        case GROUP_PROP_X:
+        {
+            old = group->xpos;
+            group->xpos = g_value_get_double (value);
+            if (old != group->xpos)
+            {
+                moved = TRUE;
+            }
+        }
+        break;
+
+        case GROUP_PROP_Y:
+        {
+            old = group->ypos;
+            group->ypos = g_value_get_double (value);
+            if (old != group->ypos)
+            {
+                moved = TRUE;
+            }
+        }
+        break;
+
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec);
+        }
+        break;
+    }
+
+    if (moved)
+    {
+        item->flags |= EEL_CANVAS_ITEM_NEED_DEEP_UPDATE;
+        if (item->parent != NULL)
+        {
+            eel_canvas_item_request_update (item->parent);
+        }
+        else
+        {
+            eel_canvas_request_update (item->canvas);
+        }
+    }
+}
+
+/* Get_property handler for canvas groups */
+static void
+eel_canvas_group_get_property (GObject    *gobject,
+                               guint       param_id,
+                               GValue     *value,
+                               GParamSpec *pspec)
+{
+    EelCanvasGroup *group;
+
+    g_return_if_fail (EEL_IS_CANVAS_GROUP (gobject));
+
+    group = EEL_CANVAS_GROUP (gobject);
+
+    switch (param_id)
+    {
+        case GROUP_PROP_X:
+        {
+            g_value_set_double (value, group->xpos);
+        }
+        break;
+
+        case GROUP_PROP_Y:
+        {
+            g_value_set_double (value, group->ypos);
+        }
+        break;
+
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, param_id, pspec);
+        }
+        break;
+    }
+}
+
+/* Destroy handler for canvas groups */
+static void
+eel_canvas_group_destroy (EelCanvasItem *object)
+{
+    EelCanvasGroup *group;
+    EelCanvasItem *child;
+    GList *list;
+
+    g_return_if_fail (EEL_IS_CANVAS_GROUP (object));
+
+    group = EEL_CANVAS_GROUP (object);
+
+    list = group->item_list;
+    while (list)
+    {
+        child = list->data;
+        list = list->next;
+
+        eel_canvas_item_destroy (child);
+    }
+
+    if (EEL_CANVAS_ITEM_CLASS (group_parent_class)->destroy)
+    {
+        (*EEL_CANVAS_ITEM_CLASS (group_parent_class)->destroy)(object);
+    }
+}
+
+/* Update handler for canvas groups */
+static void
+eel_canvas_group_update (EelCanvasItem *item,
+                         double         i2w_dx,
+                         double         i2w_dy,
+                         int            flags)
+{
+    EelCanvasGroup *group;
+    GList *list;
+    EelCanvasItem *i;
+    double bbox_x0, bbox_y0, bbox_x1, bbox_y1;
+    gboolean first = TRUE;
+
+    group = EEL_CANVAS_GROUP (item);
+
+    (*group_parent_class->update)(item, i2w_dx, i2w_dy, flags);
+
+    bbox_x0 = 0;
+    bbox_y0 = 0;
+    bbox_x1 = 0;
+    bbox_y1 = 0;
+
+    for (list = group->item_list; list; list = list->next)
+    {
+        i = list->data;
+
+        eel_canvas_item_invoke_update (i, i2w_dx + group->xpos, i2w_dy + group->ypos, flags);
+
+        if (first)
+        {
+            first = FALSE;
+            bbox_x0 = i->x1;
+            bbox_y0 = i->y1;
+            bbox_x1 = i->x2;
+            bbox_y1 = i->y2;
+        }
+        else
+        {
+            bbox_x0 = MIN (bbox_x0, i->x1);
+            bbox_y0 = MIN (bbox_y0, i->y1);
+            bbox_x1 = MAX (bbox_x1, i->x2);
+            bbox_y1 = MAX (bbox_y1, i->y2);
+        }
+    }
+    item->x1 = bbox_x0;
+    item->y1 = bbox_y0;
+    item->x2 = bbox_x1;
+    item->y2 = bbox_y1;
+}
+
+/* Unrealize handler for canvas groups */
+static void
+eel_canvas_group_unrealize (EelCanvasItem *item)
+{
+    EelCanvasGroup *group;
+    GList *list;
+    EelCanvasItem *i;
+
+    group = EEL_CANVAS_GROUP (item);
+
+    /* Unmap group before children to avoid flash */
+    if (item->flags & EEL_CANVAS_ITEM_MAPPED)
+    {
+        (*EEL_CANVAS_ITEM_GET_CLASS (item)->unmap)(item);
+    }
+
+    for (list = group->item_list; list; list = list->next)
+    {
+        i = list->data;
+
+        if (i->flags & EEL_CANVAS_ITEM_REALIZED)
+        {
+            (*EEL_CANVAS_ITEM_GET_CLASS (i)->unrealize)(i);
+        }
+    }
+
+    (*group_parent_class->unrealize)(item);
+}
+
+/* Map handler for canvas groups */
+static void
+eel_canvas_group_map (EelCanvasItem *item)
+{
+    EelCanvasGroup *group;
+    GList *list;
+    EelCanvasItem *i;
+
+    group = EEL_CANVAS_GROUP (item);
+
+    for (list = group->item_list; list; list = list->next)
+    {
+        i = list->data;
+
+        if (i->flags & EEL_CANVAS_ITEM_VISIBLE &&
+            !(i->flags & EEL_CANVAS_ITEM_MAPPED))
+        {
+            if (!(i->flags & EEL_CANVAS_ITEM_REALIZED))
+            {
+                (*EEL_CANVAS_ITEM_GET_CLASS (i)->realize)(i);
+            }
+
+            (*EEL_CANVAS_ITEM_GET_CLASS (i)->map)(i);
+        }
+    }
+
+    (*group_parent_class->map)(item);
+}
+
+/* Unmap handler for canvas groups */
+static void
+eel_canvas_group_unmap (EelCanvasItem *item)
+{
+    EelCanvasGroup *group;
+    GList *list;
+    EelCanvasItem *i;
+
+    group = EEL_CANVAS_GROUP (item);
+
+    for (list = group->item_list; list; list = list->next)
+    {
+        i = list->data;
+
+        if (i->flags & EEL_CANVAS_ITEM_MAPPED)
+        {
+            (*EEL_CANVAS_ITEM_GET_CLASS (i)->unmap)(i);
+        }
+    }
+
+    (*group_parent_class->unmap)(item);
+}
+
+/* Draw handler for canvas groups */
+static void
+eel_canvas_group_draw (EelCanvasItem  *item,
+                       cairo_t        *cr,
+                       cairo_region_t *region)
+{
+    EelCanvasGroup *group;
+    GList *list;
+    EelCanvasItem *child = NULL;
+
+    group = EEL_CANVAS_GROUP (item);
+
+    for (list = group->item_list; list; list = list->next)
+    {
+        child = list->data;
+
+        if ((child->flags & EEL_CANVAS_ITEM_MAPPED) &&
+            (EEL_CANVAS_ITEM_GET_CLASS (child)->draw))
+        {
+            GdkRectangle child_rect;
+
+            child_rect.x = child->x1;
+            child_rect.y = child->y1;
+            child_rect.width = child->x2 - child->x1 + 1;
+            child_rect.height = child->y2 - child->y1 + 1;
+
+            if (cairo_region_contains_rectangle (region, &child_rect) != CAIRO_REGION_OVERLAP_OUT)
+            {
+                EEL_CANVAS_ITEM_GET_CLASS (child)->draw (child, cr, region);
+            }
+        }
+    }
+}
+
+/* Point handler for canvas groups */
+static double
+eel_canvas_group_point (EelCanvasItem  *item,
+                        double          x,
+                        double          y,
+                        int             cx,
+                        int             cy,
+                        EelCanvasItem **actual_item)
+{
+    EelCanvasGroup *group;
+    GList *list;
+    EelCanvasItem *child, *point_item;
+    int x1, y1, x2, y2;
+    double gx, gy;
+    double dist, best;
+    int has_point;
+
+    group = EEL_CANVAS_GROUP (item);
+
+    x1 = cx - item->canvas->close_enough;
+    y1 = cy - item->canvas->close_enough;
+    x2 = cx + item->canvas->close_enough;
+    y2 = cy + item->canvas->close_enough;
+
+    best = 0.0;
+    *actual_item = NULL;
+
+    gx = x - group->xpos;
+    gy = y - group->ypos;
+
+    dist = 0.0;     /* keep gcc happy */
+
+    for (list = group->item_list; list; list = list->next)
+    {
+        child = list->data;
+
+        if ((child->x1 > x2) || (child->y1 > y2) || (child->x2 < x1) || (child->y2 < y1))
+        {
+            continue;
+        }
+
+        point_item = NULL;         /* cater for incomplete item implementations */
+
+        if ((child->flags & EEL_CANVAS_ITEM_MAPPED)
+            && EEL_CANVAS_ITEM_GET_CLASS (child)->point)
+        {
+            dist = eel_canvas_item_invoke_point (child, gx, gy, cx, cy, &point_item);
+            has_point = TRUE;
+        }
+        else
+        {
+            has_point = FALSE;
+        }
+
+        if (has_point
+            && point_item
+            && ((int) (dist * item->canvas->pixels_per_unit + 0.5)
+                <= item->canvas->close_enough))
+        {
+            best = dist;
+            *actual_item = point_item;
+        }
+    }
+
+    return best;
+}
+
+static void
+eel_canvas_group_translate (EelCanvasItem *item,
+                            double         dx,
+                            double         dy)
+{
+    EelCanvasGroup *group;
+
+    group = EEL_CANVAS_GROUP (item);
+
+    group->xpos += dx;
+    group->ypos += dy;
+}
+
+/* Bounds handler for canvas groups */
+static void
+eel_canvas_group_bounds (EelCanvasItem *item,
+                         double        *x1,
+                         double        *y1,
+                         double        *x2,
+                         double        *y2)
+{
+    EelCanvasGroup *group;
+    EelCanvasItem *child;
+    GList *list;
+    double tx1, ty1, tx2, ty2;
+    double minx, miny, maxx, maxy;
+    int set;
+
+    group = EEL_CANVAS_GROUP (item);
+
+    /* Get the bounds of the first visible item */
+
+    child = NULL;     /* Unnecessary but eliminates a warning. */
+
+    set = FALSE;
+
+    for (list = group->item_list; list; list = list->next)
+    {
+        child = list->data;
+
+        if (child->flags & EEL_CANVAS_ITEM_MAPPED)
+        {
+            set = TRUE;
+            eel_canvas_item_get_bounds (child, &minx, &miny, &maxx, &maxy);
+            break;
+        }
+    }
+
+    /* If there were no visible items, return an empty bounding box */
+
+    if (!set)
+    {
+        *x1 = *y1 = *x2 = *y2 = 0.0;
+        return;
+    }
+
+    /* Now we can grow the bounds using the rest of the items */
+
+    list = list->next;
+
+    for (; list; list = list->next)
+    {
+        child = list->data;
+
+        if (!(child->flags & EEL_CANVAS_ITEM_MAPPED))
+        {
+            continue;
+        }
+
+        eel_canvas_item_get_bounds (child, &tx1, &ty1, &tx2, &ty2);
+
+        if (tx1 < minx)
+        {
+            minx = tx1;
+        }
+
+        if (ty1 < miny)
+        {
+            miny = ty1;
+        }
+
+        if (tx2 > maxx)
+        {
+            maxx = tx2;
+        }
+
+        if (ty2 > maxy)
+        {
+            maxy = ty2;
+        }
+    }
+
+    /* Make the bounds be relative to our parent's coordinate system */
+
+    if (item->parent)
+    {
+        minx += group->xpos;
+        miny += group->ypos;
+        maxx += group->xpos;
+        maxy += group->ypos;
+    }
+
+    *x1 = minx;
+    *y1 = miny;
+    *x2 = maxx;
+    *y2 = maxy;
+}
+
+/* Adds an item to a group */
+static void
+group_add (EelCanvasGroup *group,
+           EelCanvasItem  *item)
+{
+    g_object_ref_sink (item);
+
+    if (!group->item_list)
+    {
+        group->item_list = g_list_append (group->item_list, item);
+        group->item_list_end = group->item_list;
+    }
+    else
+    {
+        group->item_list_end = g_list_append (group->item_list_end, item)->next;
+    }
+
+    if (item->flags & EEL_CANVAS_ITEM_VISIBLE &&
+        group->item.flags & EEL_CANVAS_ITEM_MAPPED)
+    {
+        if (!(item->flags & EEL_CANVAS_ITEM_REALIZED))
+        {
+            (*EEL_CANVAS_ITEM_GET_CLASS (item)->realize)(item);
+        }
+
+        if (!(item->flags & EEL_CANVAS_ITEM_MAPPED))
+        {
+            (*EEL_CANVAS_ITEM_GET_CLASS (item)->map)(item);
+        }
+    }
+
+    if (item->flags & EEL_CANVAS_ITEM_VISIBLE)
+    {
+        eel_canvas_queue_resize (EEL_CANVAS_ITEM (group)->canvas);
+    }
+}
+
+/* Removes an item from a group */
+static void
+group_remove (EelCanvasGroup *group,
+              EelCanvasItem  *item)
+{
+    GList *children;
+
+    g_return_if_fail (EEL_IS_CANVAS_GROUP (group));
+    g_return_if_fail (EEL_IS_CANVAS_ITEM (item));
+
+    for (children = group->item_list; children; children = children->next)
+    {
+        if (children->data == item)
+        {
+            if (item->flags & EEL_CANVAS_ITEM_MAPPED)
+            {
+                (*EEL_CANVAS_ITEM_GET_CLASS (item)->unmap)(item);
+            }
+
+            if (item->flags & EEL_CANVAS_ITEM_REALIZED)
+            {
+                (*EEL_CANVAS_ITEM_GET_CLASS (item)->unrealize)(item);
+            }
+
+            if (item->flags & EEL_CANVAS_ITEM_VISIBLE)
+            {
+                eel_canvas_queue_resize (item->canvas);
+            }
+
+            /* Unparent the child */
+
+            item->parent = NULL;
+            /* item->canvas = NULL; */
+            g_object_unref (G_OBJECT (item));
+
+            /* Remove it from the list */
+
+            if (children == group->item_list_end)
+            {
+                group->item_list_end = children->prev;
+            }
+
+            group->item_list = g_list_remove_link (group->item_list, children);
+            g_list_free (children);
+            break;
+        }
+    }
+}
+
+
+/*** EelCanvas ***/
+
+
+static void eel_canvas_class_init (EelCanvasClass *klass);
+static void eel_canvas_init (EelCanvas *canvas);
+static void eel_canvas_destroy (GtkWidget *object);
+static void eel_canvas_map (GtkWidget *widget);
+static void eel_canvas_unmap (GtkWidget *widget);
+static void eel_canvas_realize (GtkWidget *widget);
+static void eel_canvas_unrealize (GtkWidget *widget);
+static void eel_canvas_size_allocate (GtkWidget     *widget,
+                                      GtkAllocation *allocation);
+static gint eel_canvas_button (GtkWidget      *widget,
+                               GdkEventButton *event);
+static gint eel_canvas_motion (GtkWidget      *widget,
+                               GdkEventMotion *event);
+static gint eel_canvas_draw (GtkWidget *widget,
+                             cairo_t   *cr);
+static gint eel_canvas_key (GtkWidget   *widget,
+                            GdkEventKey *event);
+static gint eel_canvas_crossing (GtkWidget        *widget,
+                                 GdkEventCrossing *event);
+static gint eel_canvas_focus_in (GtkWidget     *widget,
+                                 GdkEventFocus *event);
+static gint eel_canvas_focus_out (GtkWidget     *widget,
+                                  GdkEventFocus *event);
+static void eel_canvas_request_update_real (EelCanvas *canvas);
+static GtkLayoutClass *canvas_parent_class;
+
+/**
+ * eel_canvas_get_type:
+ *
+ * Registers the &EelCanvas class if necessary, and returns the type ID
+ * associated to it.
+ *
+ * Return value:  The type ID of the &EelCanvas class.
+ **/
+GType
+eel_canvas_get_type (void)
+{
+    static GType canvas_type = 0;
+
+    if (!canvas_type)
+    {
+        static const GTypeInfo canvas_info =
+        {
+            sizeof (EelCanvasClass),
+            (GBaseInitFunc) NULL,
+            (GBaseFinalizeFunc) NULL,
+            (GClassInitFunc) eel_canvas_class_init,
+            NULL,                       /* class_finalize */
+            NULL,                       /* class_data */
+            sizeof (EelCanvas),
+            0,                          /* n_preallocs */
+            (GInstanceInitFunc) eel_canvas_init
+        };
+
+        canvas_type = g_type_register_static (gtk_layout_get_type (),
+                                              "EelCanvas",
+                                              &canvas_info,
+                                              0);
+    }
+
+    return canvas_type;
+}
+
+static void
+eel_canvas_get_property (GObject    *object,
+                         guint       prop_id,
+                         GValue     *value,
+                         GParamSpec *pspec)
+{
+    switch (prop_id)
+    {
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+        }
+        break;
+    }
+}
+
+static void
+eel_canvas_set_property (GObject      *object,
+                         guint         prop_id,
+                         const GValue *value,
+                         GParamSpec   *pspec)
+{
+    switch (prop_id)
+    {
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+        }
+        break;
+    }
+}
+
+static void
+eel_canvas_accessible_adjustment_changed (GtkAdjustment *adjustment,
+                                          gpointer       data)
+{
+    AtkObject *atk_obj;
+
+    /* The scrollbars have changed */
+    atk_obj = ATK_OBJECT (data);
+
+    g_signal_emit_by_name (atk_obj, "visible-data-changed");
+}
+
+static void
+eel_canvas_accessible_initialize (AtkObject *obj,
+                                  gpointer   data)
+{
+    EelCanvas *canvas = data;
+
+    if (ATK_OBJECT_CLASS (accessible_parent_class)->initialize != NULL)
+    {
+        ATK_OBJECT_CLASS (accessible_parent_class)->initialize (obj, data);
+    }
+
+    gtk_accessible_set_widget (GTK_ACCESSIBLE (obj), GTK_WIDGET (data));
+    g_signal_connect (gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (canvas)),
+                      "value-changed",
+                      G_CALLBACK (eel_canvas_accessible_adjustment_changed),
+                      obj);
+    g_signal_connect (gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (canvas)),
+                      "value-changed",
+                      G_CALLBACK (eel_canvas_accessible_adjustment_changed),
+                      obj);
+
+    obj->role = ATK_ROLE_LAYERED_PANE;
+}
+
+static gint
+eel_canvas_accessible_get_n_children (AtkObject *obj)
+{
+    GtkAccessible *accessible;
+    GtkWidget *widget;
+    EelCanvas *canvas;
+    EelCanvasGroup *root_group;
+
+    accessible = GTK_ACCESSIBLE (obj);
+    widget = gtk_accessible_get_widget (accessible);
+
+    if (widget == NULL)
+    {
+        return 0;
+    }
+
+    g_return_val_if_fail (EEL_IS_CANVAS (widget), 0);
+
+    canvas = EEL_CANVAS (widget);
+    root_group = eel_canvas_root (canvas);
+    g_return_val_if_fail (root_group, 0);
+
+    return 1;
+}
+
+static AtkObject *
+eel_canvas_accessible_ref_child (AtkObject *obj,
+                                 gint       i)
+{
+    GtkAccessible *accessible;
+    GtkWidget *widget;
+    EelCanvas *canvas;
+    EelCanvasGroup *root_group;
+    AtkObject *atk_object;
+
+    /* Canvas only has one child, so return NULL if index is non zero */
+    if (i != 0)
+    {
+        return NULL;
+    }
+
+    accessible = GTK_ACCESSIBLE (obj);
+    widget = gtk_accessible_get_widget (accessible);
+
+    if (widget == NULL)
+    {
+        return NULL;
+    }
+
+    canvas = EEL_CANVAS (widget);
+    root_group = eel_canvas_root (canvas);
+    g_return_val_if_fail (root_group, NULL);
+
+    atk_object = atk_gobject_accessible_for_object (G_OBJECT (root_group));
+
+    return g_object_ref (atk_object);
+}
+
+static void
+eel_canvas_accessible_class_init (EelCanvasAccessibleClass *klass)
+{
+    AtkObjectClass *atk_class = ATK_OBJECT_CLASS (klass);
+
+    accessible_parent_class = g_type_class_peek_parent (klass);
+
+    atk_class->initialize = eel_canvas_accessible_initialize;
+    atk_class->get_n_children = eel_canvas_accessible_get_n_children;
+    atk_class->ref_child = eel_canvas_accessible_ref_child;
+}
+
+static void
+eel_canvas_accessible_init (EelCanvasAccessible *accessible)
+{
+}
+
+G_DEFINE_TYPE (EelCanvasAccessible, eel_canvas_accessible, GTK_TYPE_CONTAINER_ACCESSIBLE)
+
+/* Class initialization function for EelCanvasClass */
+static void
+eel_canvas_class_init (EelCanvasClass *klass)
+{
+    GObjectClass *gobject_class;
+    GtkWidgetClass *widget_class;
+
+    gobject_class = (GObjectClass *) klass;
+    widget_class = (GtkWidgetClass *) klass;
+
+    canvas_parent_class = g_type_class_peek_parent (klass);
+
+    gobject_class->set_property = eel_canvas_set_property;
+    gobject_class->get_property = eel_canvas_get_property;
+
+    widget_class->destroy = eel_canvas_destroy;
+    widget_class->map = eel_canvas_map;
+    widget_class->unmap = eel_canvas_unmap;
+    widget_class->realize = eel_canvas_realize;
+    widget_class->unrealize = eel_canvas_unrealize;
+    widget_class->size_allocate = eel_canvas_size_allocate;
+    widget_class->button_press_event = eel_canvas_button;
+    widget_class->button_release_event = eel_canvas_button;
+    widget_class->motion_notify_event = eel_canvas_motion;
+    widget_class->draw = eel_canvas_draw;
+    widget_class->key_press_event = eel_canvas_key;
+    widget_class->key_release_event = eel_canvas_key;
+    widget_class->enter_notify_event = eel_canvas_crossing;
+    widget_class->leave_notify_event = eel_canvas_crossing;
+    widget_class->focus_in_event = eel_canvas_focus_in;
+    widget_class->focus_out_event = eel_canvas_focus_out;
+
+    klass->request_update = eel_canvas_request_update_real;
+
+    gtk_widget_class_set_accessible_type (widget_class, eel_canvas_accessible_get_type ());
+}
+
+/* Callback used when the root item of a canvas is destroyed.  The user should
+ * never ever do this, so we panic if this happens.
+ */
+static void
+panic_root_destroyed (GtkWidget *object,
+                      gpointer   data)
+{
+    g_error ("Eeeek, root item %p of canvas %p was destroyed!", object, data);
+}
+
+/* Object initialization function for EelCanvas */
+static void
+eel_canvas_init (EelCanvas *canvas)
+{
+    guint width, height;
+    gtk_widget_set_can_focus (GTK_WIDGET (canvas), TRUE);
+
+    gtk_widget_set_redraw_on_allocate (GTK_WIDGET (canvas), FALSE);
+
+    canvas->scroll_x1 = 0.0;
+    canvas->scroll_y1 = 0.0;
+    gtk_layout_get_size (GTK_LAYOUT (canvas),
+                         &width, &height);
+    canvas->scroll_x2 = width;
+    canvas->scroll_y2 = height;
+
+    canvas->pixels_per_unit = 1.0;
+
+    canvas->pick_event.type = GDK_LEAVE_NOTIFY;
+    canvas->pick_event.crossing.x = 0;
+    canvas->pick_event.crossing.y = 0;
+
+    gtk_scrollable_set_hadjustment (GTK_SCROLLABLE (canvas), NULL);
+    gtk_scrollable_set_vadjustment (GTK_SCROLLABLE (canvas), NULL);
+
+    /* Create the root item as a special case */
+
+    canvas->root = EEL_CANVAS_ITEM (g_object_new (eel_canvas_group_get_type (), NULL));
+    canvas->root->canvas = canvas;
+
+    g_object_ref_sink (canvas->root);
+
+    canvas->root_destroy_id = g_signal_connect (G_OBJECT (canvas->root),
+                                                "destroy", G_CALLBACK (panic_root_destroyed), canvas);
+
+    canvas->need_repick = TRUE;
+    canvas->doing_update = FALSE;
+}
+
+/* Convenience function to remove the idle handler of a canvas */
+static void
+remove_idle (EelCanvas *canvas)
+{
+    if (canvas->idle_id == 0)
+    {
+        return;
+    }
+
+    g_source_remove (canvas->idle_id);
+    canvas->idle_id = 0;
+}
+
+/* Removes the transient state of the canvas (idle handler, grabs). */
+static void
+shutdown_transients (EelCanvas *canvas)
+{
+    /* We turn off the need_redraw flag, since if the canvas is mapped again
+     * it will request a redraw anyways.  We do not turn off the need_update
+     * flag, though, because updates are not queued when the canvas remaps
+     * itself.
+     */
+    if (canvas->need_redraw)
+    {
+        canvas->need_redraw = FALSE;
+    }
+
+    if (canvas->grabbed_item)
+    {
+        eel_canvas_item_ungrab (canvas->grabbed_item);
+    }
+
+    remove_idle (canvas);
+}
+
+/* Destroy handler for EelCanvas */
+static void
+eel_canvas_destroy (GtkWidget *object)
+{
+    EelCanvas *canvas;
+
+    g_return_if_fail (EEL_IS_CANVAS (object));
+
+    /* remember, destroy can be run multiple times! */
+
+    canvas = EEL_CANVAS (object);
+
+    g_clear_signal_handler (&canvas->root_destroy_id, G_OBJECT (canvas->root));
+    if (canvas->root)
+    {
+        EelCanvasItem *root = canvas->root;
+        canvas->root = NULL;
+        eel_canvas_item_destroy (root);
+        g_object_unref (root);
+    }
+
+    shutdown_transients (canvas);
+
+    if (GTK_WIDGET_CLASS (canvas_parent_class)->destroy)
+    {
+        (*GTK_WIDGET_CLASS (canvas_parent_class)->destroy)(object);
+    }
+}
+
+/**
+ * eel_canvas_new:
+ * @void:
+ *
+ * Creates a new empty canvas.  If you wish to use the
+ * &EelCanvasImage item inside this canvas, then you must push the gdk_imlib
+ * visual and colormap before calling this function, and they can be popped
+ * afterwards.
+ *
+ * Return value: A newly-created canvas.
+ **/
+GtkWidget *
+eel_canvas_new (void)
+{
+    return GTK_WIDGET (g_object_new (eel_canvas_get_type (), NULL));
+}
+
+/* Map handler for the canvas */
+static void
+eel_canvas_map (GtkWidget *widget)
+{
+    EelCanvas *canvas;
+
+    g_return_if_fail (EEL_IS_CANVAS (widget));
+
+    /* Normal widget mapping stuff */
+
+    if (GTK_WIDGET_CLASS (canvas_parent_class)->map)
+    {
+        (*GTK_WIDGET_CLASS (canvas_parent_class)->map)(widget);
+    }
+
+    canvas = EEL_CANVAS (widget);
+
+    /* Map items */
+
+    if (canvas->root->flags & EEL_CANVAS_ITEM_VISIBLE &&
+        !(canvas->root->flags & EEL_CANVAS_ITEM_MAPPED) &&
+        EEL_CANVAS_ITEM_GET_CLASS (canvas->root)->map)
+    {
+        (*EEL_CANVAS_ITEM_GET_CLASS (canvas->root)->map)(canvas->root);
+    }
+}
+
+/* Unmap handler for the canvas */
+static void
+eel_canvas_unmap (GtkWidget *widget)
+{
+    EelCanvas *canvas;
+
+    g_return_if_fail (EEL_IS_CANVAS (widget));
+
+    canvas = EEL_CANVAS (widget);
+
+    shutdown_transients (canvas);
+
+    /* Unmap items */
+
+    if (EEL_CANVAS_ITEM_GET_CLASS (canvas->root)->unmap)
+    {
+        (*EEL_CANVAS_ITEM_GET_CLASS (canvas->root)->unmap)(canvas->root);
+    }
+
+    /* Normal widget unmapping stuff */
+
+    if (GTK_WIDGET_CLASS (canvas_parent_class)->unmap)
+    {
+        (*GTK_WIDGET_CLASS (canvas_parent_class)->unmap)(widget);
+    }
+}
+
+/* Realize handler for the canvas */
+static void
+eel_canvas_realize (GtkWidget *widget)
+{
+    EelCanvas *canvas;
+
+    g_return_if_fail (EEL_IS_CANVAS (widget));
+
+    /* Normal widget realization stuff */
+
+    if (GTK_WIDGET_CLASS (canvas_parent_class)->realize)
+    {
+        (*GTK_WIDGET_CLASS (canvas_parent_class)->realize)(widget);
+    }
+
+    canvas = EEL_CANVAS (widget);
+
+    gdk_window_set_events (gtk_layout_get_bin_window (GTK_LAYOUT (canvas)),
+                           (gdk_window_get_events (gtk_layout_get_bin_window (GTK_LAYOUT (canvas)))
+                            | GDK_EXPOSURE_MASK
+                            | GDK_BUTTON_PRESS_MASK
+                            | GDK_BUTTON_RELEASE_MASK
+                            | GDK_POINTER_MOTION_MASK
+                            | GDK_KEY_PRESS_MASK
+                            | GDK_KEY_RELEASE_MASK
+                            | GDK_ENTER_NOTIFY_MASK
+                            | GDK_LEAVE_NOTIFY_MASK
+                            | GDK_FOCUS_CHANGE_MASK));
+
+    /* Create our own temporary pixmap gc and realize all the items */
+
+    (*EEL_CANVAS_ITEM_GET_CLASS (canvas->root)->realize)(canvas->root);
+}
+
+/* Unrealize handler for the canvas */
+static void
+eel_canvas_unrealize (GtkWidget *widget)
+{
+    EelCanvas *canvas;
+
+    g_return_if_fail (EEL_IS_CANVAS (widget));
+
+    canvas = EEL_CANVAS (widget);
+
+    shutdown_transients (canvas);
+
+    /* Unrealize items and parent widget */
+
+    (*EEL_CANVAS_ITEM_GET_CLASS (canvas->root)->unrealize)(canvas->root);
+
+    if (GTK_WIDGET_CLASS (canvas_parent_class)->unrealize)
+    {
+        (*GTK_WIDGET_CLASS (canvas_parent_class)->unrealize)(widget);
+    }
+}
+
+/* Handles scrolling of the canvas.  Adjusts the scrolling and zooming offset to
+ * keep as much as possible of the canvas scrolling region in view.
+ */
+static void
+scroll_to (EelCanvas *canvas,
+           int        cx,
+           int        cy)
+{
+    int scroll_width, scroll_height;
+    int right_limit, bottom_limit;
+    int old_zoom_xofs, old_zoom_yofs;
+    int changed_x = FALSE, changed_y = FALSE;
+    int canvas_width, canvas_height;
+    GtkAllocation allocation;
+    GtkAdjustment *vadjustment, *hadjustment;
+    guint width, height;
+
+    gtk_widget_get_allocation (GTK_WIDGET (canvas), &allocation);
+    canvas_width = allocation.width;
+    canvas_height = allocation.height;
+
+    scroll_width = floor ((canvas->scroll_x2 - canvas->scroll_x1) * canvas->pixels_per_unit + 0.5);
+    scroll_height = floor ((canvas->scroll_y2 - canvas->scroll_y1) * canvas->pixels_per_unit + 0.5);
+
+    right_limit = scroll_width - canvas_width;
+    bottom_limit = scroll_height - canvas_height;
+
+    old_zoom_xofs = canvas->zoom_xofs;
+    old_zoom_yofs = canvas->zoom_yofs;
+
+    if (right_limit < 0)
+    {
+        cx = 0;
+        if (canvas->center_scroll_region)
+        {
+            canvas->zoom_xofs = (canvas_width - scroll_width) / 2;
+            scroll_width = canvas_width;
+        }
+        else
+        {
+            canvas->zoom_xofs = 0;
+        }
+    }
+    else if (cx < 0)
+    {
+        cx = 0;
+        canvas->zoom_xofs = 0;
+    }
+    else if (cx > right_limit)
+    {
+        cx = right_limit;
+        canvas->zoom_xofs = 0;
+    }
+    else
+    {
+        canvas->zoom_xofs = 0;
+    }
+
+    if (bottom_limit < 0)
+    {
+        cy = 0;
+        if (canvas->center_scroll_region)
+        {
+            canvas->zoom_yofs = (canvas_height - scroll_height) / 2;
+            scroll_height = canvas_height;
+        }
+        else
+        {
+            canvas->zoom_yofs = 0;
+        }
+    }
+    else if (cy < 0)
+    {
+        cy = 0;
+        canvas->zoom_yofs = 0;
+    }
+    else if (cy > bottom_limit)
+    {
+        cy = bottom_limit;
+        canvas->zoom_yofs = 0;
+    }
+    else
+    {
+        canvas->zoom_yofs = 0;
+    }
+
+    if ((canvas->zoom_xofs != old_zoom_xofs) || (canvas->zoom_yofs != old_zoom_yofs))
+    {
+        /* This can only occur, if either canvas size or widget size changes
+         * So I think we can request full redraw here
+         * More stuff - we have to mark root as needing fresh affine (Lauris)
+         */
+        if (!(canvas->root->flags & EEL_CANVAS_ITEM_NEED_DEEP_UPDATE))
+        {
+            canvas->root->flags |= EEL_CANVAS_ITEM_NEED_DEEP_UPDATE;
+            eel_canvas_request_update (canvas);
+        }
+        gtk_widget_queue_draw (GTK_WIDGET (canvas));
+    }
+
+    hadjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (canvas));
+    vadjustment = gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (canvas));
+
+    if (((int) gtk_adjustment_get_value (hadjustment)) != cx)
+    {
+        gtk_adjustment_set_value (hadjustment, cx);
+        changed_x = TRUE;
+    }
+
+    if (((int) gtk_adjustment_get_value (vadjustment)) != cy)
+    {
+        gtk_adjustment_set_value (vadjustment, cy);
+        changed_y = TRUE;
+    }
+
+    gtk_layout_get_size (&canvas->layout, &width, &height);
+    if ((scroll_width != (int) width) || (scroll_height != (int) height))
+    {
+        gtk_layout_set_size (GTK_LAYOUT (canvas), scroll_width, scroll_height);
+    }
+
+    /* Signal GtkLayout that it should do a redraw. */
+    if (changed_x)
+    {
+        g_signal_emit_by_name (hadjustment, "value-changed");
+    }
+    if (changed_y)
+    {
+        g_signal_emit_by_name (vadjustment, "value-changed");
+    }
+}
+
+/* Size allocation handler for the canvas */
+static void
+eel_canvas_size_allocate (GtkWidget     *widget,
+                          GtkAllocation *allocation)
+{
+    EelCanvas *canvas;
+    GtkAdjustment *vadjustment, *hadjustment;
+
+    g_return_if_fail (EEL_IS_CANVAS (widget));
+    g_return_if_fail (allocation != NULL);
+
+    if (GTK_WIDGET_CLASS (canvas_parent_class)->size_allocate)
+    {
+        (*GTK_WIDGET_CLASS (canvas_parent_class)->size_allocate)(widget, allocation);
+    }
+
+    canvas = EEL_CANVAS (widget);
+
+    /* Recenter the view, if appropriate */
+
+    hadjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (canvas));
+    vadjustment = gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (canvas));
+
+    gtk_adjustment_set_page_size (hadjustment, allocation->width);
+    gtk_adjustment_set_page_increment (hadjustment, allocation->width / 2);
+
+    gtk_adjustment_set_page_size (vadjustment, allocation->height);
+    gtk_adjustment_set_page_increment (vadjustment, allocation->height / 2);
+
+    scroll_to (canvas,
+               gtk_adjustment_get_value (hadjustment),
+               gtk_adjustment_get_value (vadjustment));
+
+    g_signal_emit_by_name (hadjustment, "changed");
+    g_signal_emit_by_name (vadjustment, "changed");
+}
+
+/* Emits an event for an item in the canvas, be it the current item, grabbed
+ * item, or focused item, as appropriate.
+ */
+
+static int
+emit_event (EelCanvas *canvas,
+            GdkEvent  *event)
+{
+    GdkEvent ev;
+    gint finished;
+    EelCanvasItem *item;
+    EelCanvasItem *parent;
+    guint mask;
+
+    /* Could be an old pick event */
+    if (!gtk_widget_get_realized (GTK_WIDGET (canvas)))
+    {
+        return FALSE;
+    }
+
+    /* Perform checks for grabbed items */
+
+    if (canvas->grabbed_item &&
+        !is_descendant (canvas->current_item, canvas->grabbed_item))
+    {
+        return FALSE;
+    }
+
+    if (canvas->grabbed_item)
+    {
+        switch (event->type)
+        {
+            case GDK_ENTER_NOTIFY:
+            {
+                mask = GDK_ENTER_NOTIFY_MASK;
+            }
+            break;
+
+            case GDK_LEAVE_NOTIFY:
+            {
+                mask = GDK_LEAVE_NOTIFY_MASK;
+            }
+            break;
+
+            case GDK_MOTION_NOTIFY:
+            {
+                mask = GDK_POINTER_MOTION_MASK;
+            }
+            break;
+
+            case GDK_BUTTON_PRESS:
+            case GDK_2BUTTON_PRESS:
+            case GDK_3BUTTON_PRESS:
+            {
+                mask = GDK_BUTTON_PRESS_MASK;
+            }
+            break;
+
+            case GDK_BUTTON_RELEASE:
+            {
+                mask = GDK_BUTTON_RELEASE_MASK;
+            }
+            break;
+
+            case GDK_KEY_PRESS:
+            {
+                mask = GDK_KEY_PRESS_MASK;
+            }
+            break;
+
+            case GDK_KEY_RELEASE:
+            {
+                mask = GDK_KEY_RELEASE_MASK;
+            }
+            break;
+
+            default:
+            {
+                mask = 0;
+            }
+            break;
+        }
+
+        if (!(mask & canvas->grabbed_event_mask))
+        {
+            return FALSE;
+        }
+    }
+
+    /* Convert to world coordinates -- we have two cases because of diferent
+     * offsets of the fields in the event structures.
+     */
+
+    ev = *event;
+
+    switch (ev.type)
+    {
+        case GDK_ENTER_NOTIFY:
+        case GDK_LEAVE_NOTIFY:
+        {
+            eel_canvas_window_to_world (canvas,
+                                        ev.crossing.x, ev.crossing.y,
+                                        &ev.crossing.x, &ev.crossing.y);
+        }
+        break;
+
+        case GDK_MOTION_NOTIFY:
+        case GDK_BUTTON_PRESS:
+        case GDK_2BUTTON_PRESS:
+        case GDK_3BUTTON_PRESS:
+        case GDK_BUTTON_RELEASE:
+        {
+            eel_canvas_window_to_world (canvas,
+                                        ev.motion.x, ev.motion.y,
+                                        &ev.motion.x, &ev.motion.y);
+        }
+        break;
+
+        default:
+        {
+        }
+        break;
+    }
+
+    /* Choose where we send the event */
+
+    item = canvas->current_item;
+
+    if (canvas->focused_item
+        && ((event->type == GDK_KEY_PRESS) ||
+            (event->type == GDK_KEY_RELEASE) ||
+            (event->type == GDK_FOCUS_CHANGE)))
+    {
+        item = canvas->focused_item;
+    }
+
+    /* The event is propagated up the hierarchy (for if someone connected to
+     * a group instead of a leaf event), and emission is stopped if a
+     * handler returns TRUE, just like for GtkWidget events.
+     */
+
+    finished = FALSE;
+
+    while (item && !finished)
+    {
+        g_object_ref (item);
+
+        g_signal_emit (
+            G_OBJECT (item), item_signals[ITEM_EVENT], 0,
+            &ev, &finished);
+
+        parent = item->parent;
+        g_object_unref (item);
+
+        item = parent;
+    }
+
+    return finished;
+}
+
+/* Re-picks the current item in the canvas, based on the event's coordinates.
+ * Also emits enter/leave events for items as appropriate.
+ */
+static int
+pick_current_item (EelCanvas *canvas,
+                   GdkEvent  *event)
+{
+    int button_down;
+    double x, y;
+    int cx, cy;
+    int retval;
+
+    retval = FALSE;
+
+    /* If a button is down, we'll perform enter and leave events on the
+     * current item, but not enter on any other item.  This is more or less
+     * like X pointer grabbing for canvas items.
+     */
+    button_down = canvas->state & (GDK_BUTTON1_MASK
+                                   | GDK_BUTTON2_MASK
+                                   | GDK_BUTTON3_MASK
+                                   | GDK_BUTTON4_MASK
+                                   | GDK_BUTTON5_MASK);
+    if (!button_down)
+    {
+        canvas->left_grabbed_item = FALSE;
+    }
+
+    /* Save the event in the canvas.  This is used to synthesize enter and
+     * leave events in case the current item changes.  It is also used to
+     * re-pick the current item if the current one gets deleted.  Also,
+     * synthesize an enter event.
+     */
+    if (event != &canvas->pick_event)
+    {
+        if ((event->type == GDK_MOTION_NOTIFY) || (event->type == GDK_BUTTON_RELEASE))
+        {
+            /* these fields have the same offsets in both types of events */
+
+            canvas->pick_event.crossing.type = GDK_ENTER_NOTIFY;
+            canvas->pick_event.crossing.window = event->motion.window;
+            canvas->pick_event.crossing.send_event = event->motion.send_event;
+            canvas->pick_event.crossing.subwindow = NULL;
+            canvas->pick_event.crossing.x = event->motion.x;
+            canvas->pick_event.crossing.y = event->motion.y;
+            canvas->pick_event.crossing.mode = GDK_CROSSING_NORMAL;
+            canvas->pick_event.crossing.detail = GDK_NOTIFY_NONLINEAR;
+            canvas->pick_event.crossing.focus = FALSE;
+            canvas->pick_event.crossing.state = event->motion.state;
+
+            /* these fields don't have the same offsets in both types of events */
+
+            if (event->type == GDK_MOTION_NOTIFY)
+            {
+                canvas->pick_event.crossing.x_root = event->motion.x_root;
+                canvas->pick_event.crossing.y_root = event->motion.y_root;
+            }
+            else
+            {
+                canvas->pick_event.crossing.x_root = event->button.x_root;
+                canvas->pick_event.crossing.y_root = event->button.y_root;
+            }
+        }
+        else
+        {
+            canvas->pick_event = *event;
+        }
+    }
+
+    /* Don't do anything else if this is a recursive call */
+
+    if (canvas->in_repick)
+    {
+        return retval;
+    }
+
+    /* LeaveNotify means that there is no current item, so we don't look for one */
+
+    if (canvas->pick_event.type != GDK_LEAVE_NOTIFY)
+    {
+        /* these fields don't have the same offsets in both types of events */
+
+        if (canvas->pick_event.type == GDK_ENTER_NOTIFY)
+        {
+            x = canvas->pick_event.crossing.x;
+            y = canvas->pick_event.crossing.y;
+        }
+        else
+        {
+            x = canvas->pick_event.motion.x;
+            y = canvas->pick_event.motion.y;
+        }
+
+        /* canvas pixel coords */
+
+        cx = (int) (x + 0.5);
+        cy = (int) (y + 0.5);
+
+        /* world coords */
+        eel_canvas_c2w (canvas, cx, cy, &x, &y);
+
+        /* find the closest item */
+        if (canvas->root->flags & EEL_CANVAS_ITEM_MAPPED)
+        {
+            eel_canvas_item_invoke_point (canvas->root, x, y, cx, cy,
+                                          &canvas->new_current_item);
+        }
+        else
+        {
+            canvas->new_current_item = NULL;
+        }
+    }
+    else
+    {
+        canvas->new_current_item = NULL;
+    }
+
+    if ((canvas->new_current_item == canvas->current_item) && !canvas->left_grabbed_item)
+    {
+        return retval;         /* current item did not change */
+    }
+    /* Synthesize events for old and new current items */
+
+    if ((canvas->new_current_item != canvas->current_item)
+        && (canvas->current_item != NULL)
+        && !canvas->left_grabbed_item)
+    {
+        GdkEvent new_event;
+
+        new_event = canvas->pick_event;
+        new_event.type = GDK_LEAVE_NOTIFY;
+
+        new_event.crossing.detail = GDK_NOTIFY_ANCESTOR;
+        new_event.crossing.subwindow = NULL;
+        canvas->in_repick = TRUE;
+        retval = emit_event (canvas, &new_event);
+        canvas->in_repick = FALSE;
+    }
+
+    /* new_current_item may have been set to NULL during the call to emit_event() above */
+
+    if ((canvas->new_current_item != canvas->current_item) && button_down)
+    {
+        canvas->current_item = canvas->new_current_item;
+        canvas->left_grabbed_item = TRUE;
+        return retval;
+    }
+
+    /* Handle the rest of cases */
+
+    canvas->left_grabbed_item = FALSE;
+    canvas->current_item = canvas->new_current_item;
+
+    if (canvas->current_item != NULL)
+    {
+        GdkEvent new_event;
+
+        new_event = canvas->pick_event;
+        new_event.type = GDK_ENTER_NOTIFY;
+        new_event.crossing.detail = GDK_NOTIFY_ANCESTOR;
+        new_event.crossing.subwindow = NULL;
+        retval = emit_event (canvas, &new_event);
+    }
+
+    return retval;
+}
+
+/* Button event handler for the canvas */
+static gint
+eel_canvas_button (GtkWidget      *widget,
+                   GdkEventButton *event)
+{
+    EelCanvas *canvas;
+    int mask;
+    int retval;
+
+    g_return_val_if_fail (EEL_IS_CANVAS (widget), FALSE);
+    g_return_val_if_fail (event != NULL, FALSE);
+
+    retval = FALSE;
+
+    canvas = EEL_CANVAS (widget);
+
+    /* Don't handle extra mouse button events */
+    if (event->button > 5)
+    {
+        return FALSE;
+    }
+
+    /*
+     * dispatch normally regardless of the event's window if an item has
+     * has a pointer grab in effect
+     */
+    if (!canvas->grabbed_item && event->window != gtk_layout_get_bin_window (GTK_LAYOUT (canvas)))
+    {
+        return retval;
+    }
+
+    switch (event->button)
+    {
+        case 1:
+        {
+            mask = GDK_BUTTON1_MASK;
+        }
+        break;
+
+        case 2:
+        {
+            mask = GDK_BUTTON2_MASK;
+        }
+        break;
+
+        case 3:
+        {
+            mask = GDK_BUTTON3_MASK;
+        }
+        break;
+
+        case 4:
+        {
+            mask = GDK_BUTTON4_MASK;
+        }
+        break;
+
+        case 5:
+        {
+            mask = GDK_BUTTON5_MASK;
+        }
+        break;
+
+        default:
+            mask = 0;
+    }
+
+    switch (event->type)
+    {
+        case GDK_BUTTON_PRESS:
+        case GDK_2BUTTON_PRESS:
+        case GDK_3BUTTON_PRESS:
+        {
+            /* Pick the current item as if the button were not pressed, and
+             * then process the event.
+             */
+            event->state ^= mask;
+            canvas->state = event->state;
+            pick_current_item (canvas, (GdkEvent *) event);
+            event->state ^= mask;
+            canvas->state = event->state;
+            retval = emit_event (canvas, (GdkEvent *) event);
+        }
+        break;
+
+        case GDK_BUTTON_RELEASE:
+        {
+            /* Process the event as if the button were pressed, then repick
+             * after the button has been released
+             */
+            canvas->state = event->state;
+            retval = emit_event (canvas, (GdkEvent *) event);
+            event->state ^= mask;
+            canvas->state = event->state;
+            pick_current_item (canvas, (GdkEvent *) event);
+            event->state ^= mask;
+        }
+        break;
+
+        default:
+            g_assert_not_reached ();
+    }
+
+    return retval;
+}
+
+/* Motion event handler for the canvas */
+static gint
+eel_canvas_motion (GtkWidget      *widget,
+                   GdkEventMotion *event)
+{
+    EelCanvas *canvas;
+
+    g_return_val_if_fail (EEL_IS_CANVAS (widget), FALSE);
+    g_return_val_if_fail (event != NULL, FALSE);
+
+    canvas = EEL_CANVAS (widget);
+
+    if (event->window != gtk_layout_get_bin_window (GTK_LAYOUT (canvas)))
+    {
+        return FALSE;
+    }
+
+    canvas->state = event->state;
+    pick_current_item (canvas, (GdkEvent *) event);
+    return emit_event (canvas, (GdkEvent *) event);
+}
+
+/* Key event handler for the canvas */
+static gint
+eel_canvas_key (GtkWidget   *widget,
+                GdkEventKey *event)
+{
+    EelCanvas *canvas;
+
+    g_return_val_if_fail (EEL_IS_CANVAS (widget), FALSE);
+    g_return_val_if_fail (event != NULL, FALSE);
+
+    canvas = EEL_CANVAS (widget);
+
+    if (emit_event (canvas, (GdkEvent *) event))
+    {
+        return TRUE;
+    }
+    if (event->type == GDK_KEY_RELEASE)
+    {
+        return GTK_WIDGET_CLASS (canvas_parent_class)->key_release_event (widget, event);
+    }
+    else
+    {
+        return GTK_WIDGET_CLASS (canvas_parent_class)->key_press_event (widget, event);
+    }
+}
+
+
+/* Crossing event handler for the canvas */
+static gint
+eel_canvas_crossing (GtkWidget        *widget,
+                     GdkEventCrossing *event)
+{
+    EelCanvas *canvas;
+
+    g_return_val_if_fail (EEL_IS_CANVAS (widget), FALSE);
+    g_return_val_if_fail (event != NULL, FALSE);
+
+    canvas = EEL_CANVAS (widget);
+
+    if (event->window != gtk_layout_get_bin_window (GTK_LAYOUT (canvas)))
+    {
+        return FALSE;
+    }
+
+    canvas->state = event->state;
+    return pick_current_item (canvas, (GdkEvent *) event);
+}
+
+/* Focus in handler for the canvas */
+static gint
+eel_canvas_focus_in (GtkWidget     *widget,
+                     GdkEventFocus *event)
+{
+    EelCanvas *canvas;
+
+    canvas = EEL_CANVAS (widget);
+
+    if (canvas->focused_item)
+    {
+        return emit_event (canvas, (GdkEvent *) event);
+    }
+    else
+    {
+        return FALSE;
+    }
+}
+
+/* Focus out handler for the canvas */
+static gint
+eel_canvas_focus_out (GtkWidget     *widget,
+                      GdkEventFocus *event)
+{
+    EelCanvas *canvas;
+
+    canvas = EEL_CANVAS (widget);
+
+    if (canvas->focused_item)
+    {
+        return emit_event (canvas, (GdkEvent *) event);
+    }
+    else
+    {
+        return FALSE;
+    }
+}
+
+
+static cairo_region_t *
+eel_cairo_get_clip_region (cairo_t *cr)
+{
+    cairo_rectangle_list_t *list;
+    cairo_region_t *region;
+    int i;
+
+    list = cairo_copy_clip_rectangle_list (cr);
+    if (list->status == CAIRO_STATUS_CLIP_NOT_REPRESENTABLE)
+    {
+        cairo_rectangle_int_t clip_rect;
+
+        cairo_rectangle_list_destroy (list);
+
+        if (!gdk_cairo_get_clip_rectangle (cr, &clip_rect))
+        {
+            return NULL;
+        }
+        return cairo_region_create_rectangle (&clip_rect);
+    }
+
+
+    region = cairo_region_create ();
+    for (i = list->num_rectangles - 1; i >= 0; --i)
+    {
+        cairo_rectangle_t *rect = &list->rectangles[i];
+        cairo_rectangle_int_t clip_rect;
+
+        clip_rect.x = floor (rect->x);
+        clip_rect.y = floor (rect->y);
+        clip_rect.width = ceil (rect->x + rect->width) - clip_rect.x;
+        clip_rect.height = ceil (rect->y + rect->height) - clip_rect.y;
+
+        if (cairo_region_union_rectangle (region, &clip_rect) != CAIRO_STATUS_SUCCESS)
+        {
+            cairo_region_destroy (region);
+            region = NULL;
+            break;
+        }
+    }
+
+    cairo_rectangle_list_destroy (list);
+    return region;
+}
+
+/* Expose handler for the canvas */
+static gboolean
+eel_canvas_draw (GtkWidget *widget,
+                 cairo_t   *cr)
+{
+    EelCanvas *canvas = EEL_CANVAS (widget);
+    GdkWindow *bin_window;
+    cairo_region_t *region;
+
+    if (!gdk_cairo_get_clip_rectangle (cr, NULL))
+    {
+        return FALSE;
+    }
+
+    bin_window = gtk_layout_get_bin_window (GTK_LAYOUT (widget));
+
+    if (!gtk_cairo_should_draw_window (cr, bin_window))
+    {
+        return FALSE;
+    }
+
+    cairo_save (cr);
+
+    gtk_cairo_transform_to_window (cr, widget, bin_window);
+
+    region = eel_cairo_get_clip_region (cr);
+    if (region == NULL)
+    {
+        cairo_restore (cr);
+        return FALSE;
+    }
+
+#ifdef VERBOSE
+    g_print ("Draw\n");
+#endif
+    /* If there are any outstanding items that need updating, do them now */
+    if (canvas->idle_id)
+    {
+        g_source_remove (canvas->idle_id);
+        canvas->idle_id = 0;
+    }
+    if (canvas->need_update)
+    {
+        g_return_val_if_fail (!canvas->doing_update, FALSE);
+
+        canvas->doing_update = TRUE;
+        eel_canvas_item_invoke_update (canvas->root, 0, 0, 0);
+
+        g_return_val_if_fail (canvas->doing_update, FALSE);
+
+        canvas->doing_update = FALSE;
+
+        canvas->need_update = FALSE;
+    }
+
+    if (canvas->root->flags & EEL_CANVAS_ITEM_MAPPED)
+    {
+        EEL_CANVAS_ITEM_GET_CLASS (canvas->root)->draw (canvas->root, cr, region);
+    }
+
+    cairo_restore (cr);
+
+    /* Chain up to get exposes on child widgets */
+    if (GTK_WIDGET_CLASS (canvas_parent_class)->draw)
+    {
+        GTK_WIDGET_CLASS (canvas_parent_class)->draw (widget, cr);
+    }
+
+    cairo_region_destroy (region);
+    return FALSE;
+}
+
+static void
+do_update (EelCanvas *canvas)
+{
+    /* Cause the update if necessary */
+
+update_again:
+    if (canvas->need_update)
+    {
+        g_return_if_fail (!canvas->doing_update);
+
+        canvas->doing_update = TRUE;
+        eel_canvas_item_invoke_update (canvas->root, 0, 0, 0);
+
+        g_return_if_fail (canvas->doing_update);
+
+        canvas->doing_update = FALSE;
+
+        canvas->need_update = FALSE;
+    }
+
+    /* Pick new current item */
+
+    while (canvas->need_repick)
+    {
+        canvas->need_repick = FALSE;
+        pick_current_item (canvas, &canvas->pick_event);
+    }
+
+    /* it is possible that during picking we emitted an event in which
+     *  the user then called some function which then requested update
+     *  of something.  Without this we'd be left in a state where
+     *  need_update would have been left TRUE and the canvas would have
+     *  been left unpainted. */
+    if (canvas->need_update)
+    {
+        goto update_again;
+    }
+}
+
+/* Idle handler for the canvas.  It deals with pending updates and redraws. */
+static gint
+idle_handler (gpointer data)
+{
+    EelCanvas *canvas;
+
+    canvas = EEL_CANVAS (data);
+    do_update (canvas);
+
+    /* Reset idle id */
+    canvas->idle_id = 0;
+
+    return FALSE;
+}
+
+/* Convenience function to add an idle handler to a canvas */
+static void
+add_idle (EelCanvas *canvas)
+{
+    if (!canvas->idle_id)
+    {
+        /* We let the update idle handler have higher priority
+         * than the redraw idle handler so the canvas state
+         * will be updated during the expose event.  canvas in
+         * expose_event.
+         */
+        canvas->idle_id = g_idle_add_full (GDK_PRIORITY_REDRAW - 20,
+                                           idle_handler, canvas, NULL);
+    }
+}
+
+/**
+ * eel_canvas_root:
+ * @canvas: A canvas.
+ *
+ * Queries the root group of a canvas.
+ *
+ * Return value: The root group of the specified canvas.
+ **/
+EelCanvasGroup *
+eel_canvas_root (EelCanvas *canvas)
+{
+    g_return_val_if_fail (EEL_IS_CANVAS (canvas), NULL);
+
+    return EEL_CANVAS_GROUP (canvas->root);
+}
+
+
+/**
+ * eel_canvas_set_scroll_region:
+ * @canvas: A canvas.
+ * @x1: Leftmost limit of the scrolling region.
+ * @y1: Upper limit of the scrolling region.
+ * @x2: Rightmost limit of the scrolling region.
+ * @y2: Lower limit of the scrolling region.
+ *
+ * Sets the scrolling region of a canvas to the specified rectangle.  The canvas
+ * will then be able to scroll only within this region.  The view of the canvas
+ * is adjusted as appropriate to display as much of the new region as possible.
+ **/
+void
+eel_canvas_set_scroll_region (EelCanvas *canvas,
+                              double     x1,
+                              double     y1,
+                              double     x2,
+                              double     y2)
+{
+    double wxofs, wyofs;
+    int xofs, yofs;
+    GtkAdjustment *vadjustment, *hadjustment;
+
+    g_return_if_fail (EEL_IS_CANVAS (canvas));
+
+    if ((canvas->scroll_x1 == x1) && (canvas->scroll_y1 == y1) &&
+        (canvas->scroll_x2 == x2) && (canvas->scroll_y2 == y2))
+    {
+        return;
+    }
+
+    /*
+     * Set the new scrolling region.  If possible, do not move the visible contents of the
+     * canvas.
+     */
+    hadjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (canvas));
+    vadjustment = gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (canvas));
+
+    eel_canvas_c2w (canvas,
+                    gtk_adjustment_get_value (hadjustment) + canvas->zoom_xofs,
+                    gtk_adjustment_get_value (vadjustment) + canvas->zoom_yofs,
+                    /*canvas->zoom_xofs,
+                     *   canvas->zoom_yofs,*/
+                    &wxofs, &wyofs);
+
+    canvas->scroll_x1 = x1;
+    canvas->scroll_y1 = y1;
+    canvas->scroll_x2 = x2;
+    canvas->scroll_y2 = y2;
+
+    eel_canvas_w2c (canvas, wxofs, wyofs, &xofs, &yofs);
+
+    scroll_to (canvas, xofs, yofs);
+
+    canvas->need_repick = TRUE;
+
+    if (!(canvas->root->flags & EEL_CANVAS_ITEM_NEED_DEEP_UPDATE))
+    {
+        canvas->root->flags |= EEL_CANVAS_ITEM_NEED_DEEP_UPDATE;
+        eel_canvas_request_update (canvas);
+    }
+}
+
+
+/**
+ * eel_canvas_get_scroll_region:
+ * @canvas: A canvas.
+ * @x1: Leftmost limit of the scrolling region (return value).
+ * @y1: Upper limit of the scrolling region (return value).
+ * @x2: Rightmost limit of the scrolling region (return value).
+ * @y2: Lower limit of the scrolling region (return value).
+ *
+ * Queries the scrolling region of a canvas.
+ **/
+void
+eel_canvas_get_scroll_region (EelCanvas *canvas,
+                              double    *x1,
+                              double    *y1,
+                              double    *x2,
+                              double    *y2)
+{
+    g_return_if_fail (EEL_IS_CANVAS (canvas));
+
+    if (x1)
+    {
+        *x1 = canvas->scroll_x1;
+    }
+
+    if (y1)
+    {
+        *y1 = canvas->scroll_y1;
+    }
+
+    if (x2)
+    {
+        *x2 = canvas->scroll_x2;
+    }
+
+    if (y2)
+    {
+        *y2 = canvas->scroll_y2;
+    }
+}
+
+/**
+ * eel_canvas_set_pixels_per_unit:
+ * @canvas: A canvas.
+ * @n: The number of pixels that correspond to one canvas unit.
+ *
+ * Sets the zooming factor of a canvas by specifying the number of pixels that
+ * correspond to one canvas unit.
+ **/
+void
+eel_canvas_set_pixels_per_unit (EelCanvas *canvas,
+                                double     n)
+{
+    GtkWidget *widget;
+    double cx, cy;
+    int x1, y1;
+    int center_x, center_y;
+    GdkWindow *window;
+    GdkWindowAttr attributes;
+    gint attributes_mask;
+    GtkAllocation allocation;
+    GtkAdjustment *vadjustment, *hadjustment;
+
+    g_return_if_fail (EEL_IS_CANVAS (canvas));
+    g_return_if_fail (n > EEL_CANVAS_EPSILON);
+
+    widget = GTK_WIDGET (canvas);
+
+    gtk_widget_get_allocation (widget, &allocation);
+    center_x = allocation.width / 2;
+    center_y = allocation.height / 2;
+
+    /* Find the coordinates of the screen center in units. */
+    hadjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (canvas));
+    vadjustment = gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (canvas));
+    cx = (gtk_adjustment_get_value (hadjustment) + center_x) / canvas->pixels_per_unit + canvas->scroll_x1 + canvas->zoom_xofs;
+    cy = (gtk_adjustment_get_value (vadjustment) + center_y) / canvas->pixels_per_unit + canvas->scroll_y1 + canvas->zoom_yofs;
+
+    /* Now calculate the new offset of the upper left corner. (round not truncate) */
+    x1 = ((cx - canvas->scroll_x1) * n) - center_x + .5;
+    y1 = ((cy - canvas->scroll_y1) * n) - center_y + .5;
+
+    canvas->pixels_per_unit = n;
+
+    if (!(canvas->root->flags & EEL_CANVAS_ITEM_NEED_DEEP_UPDATE))
+    {
+        canvas->root->flags |= EEL_CANVAS_ITEM_NEED_DEEP_UPDATE;
+        eel_canvas_request_update (canvas);
+    }
+
+    /* Map a background None window over the bin_window to avoid
+     * scrolling the window scroll causing exposes.
+     */
+    window = NULL;
+    if (gtk_widget_get_mapped (widget))
+    {
+        attributes.window_type = GDK_WINDOW_CHILD;
+        gtk_widget_get_allocation (widget, &allocation);
+        attributes.x = allocation.x;
+        attributes.y = allocation.y;
+        attributes.width = allocation.width;
+        attributes.height = allocation.height;
+        attributes.wclass = GDK_INPUT_OUTPUT;
+        attributes.visual = gtk_widget_get_visual (widget);
+        attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
+
+        attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
+
+        window = gdk_window_new (gtk_widget_get_parent_window (widget),
+                                 &attributes, attributes_mask);
+        gdk_window_set_user_data (window, widget);
+
+        gdk_window_show (window);
+    }
+
+    scroll_to (canvas, x1, y1);
+
+    /* If we created a an overlapping background None window, remove it how.
+     *
+     * TODO: We would like to temporarily set the bin_window background to
+     * None to avoid clearing the bin_window to the background, but gdk doesn't
+     * expose enought to let us do this, so we get a flash-effect here. At least
+     * it looks better than scroll + expose.
+     */
+    if (window != NULL)
+    {
+        gdk_window_hide (window);
+        gdk_window_set_user_data (window, NULL);
+        gdk_window_destroy (window);
+    }
+
+    canvas->need_repick = TRUE;
+}
+
+/**
+ * eel_canvas_get_scroll_offsets:
+ * @canvas: A canvas.
+ * @cx: Horizontal scrolling offset (return value).
+ * @cy: Vertical scrolling offset (return value).
+ *
+ * Queries the scrolling offsets of a canvas.  The values are returned in canvas
+ * pixel units.
+ **/
+void
+eel_canvas_get_scroll_offsets (EelCanvas *canvas,
+                               int       *cx,
+                               int       *cy)
+{
+    GtkAdjustment *vadjustment, *hadjustment;
+
+    g_return_if_fail (EEL_IS_CANVAS (canvas));
+
+    hadjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (canvas));
+    vadjustment = gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (canvas));
+
+    if (cx)
+    {
+        *cx = gtk_adjustment_get_value (hadjustment);
+    }
+
+    if (cy)
+    {
+        *cy = gtk_adjustment_get_value (vadjustment);
+    }
+}
+
+/* Queues an update of the canvas */
+static void
+eel_canvas_request_update (EelCanvas *canvas)
+{
+    EEL_CANVAS_GET_CLASS (canvas)->request_update (canvas);
+}
+
+static void
+eel_canvas_request_update_real (EelCanvas *canvas)
+{
+    canvas->need_update = TRUE;
+    add_idle (canvas);
+}
+
+/**
+ * eel_canvas_request_redraw:
+ * @canvas: A canvas.
+ * @x1: Leftmost coordinate of the rectangle to be redrawn.
+ * @y1: Upper coordinate of the rectangle to be redrawn.
+ * @x2: Rightmost coordinate of the rectangle to be redrawn, plus 1.
+ * @y2: Lower coordinate of the rectangle to be redrawn, plus 1.
+ *
+ * Convenience function that informs a canvas that the specified rectangle needs
+ * to be repainted.  The rectangle includes @x1 and @y1, but not @x2 and @y2.
+ * To be used only by item implementations.
+ **/
+void
+eel_canvas_request_redraw (EelCanvas *canvas,
+                           int        x1,
+                           int        y1,
+                           int        x2,
+                           int        y2)
+{
+    GdkRectangle bbox;
+
+    g_return_if_fail (EEL_IS_CANVAS (canvas));
+
+    if (!gtk_widget_is_drawable (GTK_WIDGET (canvas))
+        || (x1 >= x2) || (y1 >= y2))
+    {
+        return;
+    }
+
+    bbox.x = x1;
+    bbox.y = y1;
+    bbox.width = x2 - x1;
+    bbox.height = y2 - y1;
+
+    gdk_window_invalidate_rect (gtk_layout_get_bin_window (GTK_LAYOUT (canvas)),
+                                &bbox, FALSE);
+}
+
+/**
+ * eel_canvas_w2c:
+ * @canvas: A canvas.
+ * @wx: World X coordinate.
+ * @wy: World Y coordinate.
+ * @cx: X pixel coordinate (return value).
+ * @cy: Y pixel coordinate (return value).
+ *
+ * Converts world coordinates into canvas pixel coordinates.
+ **/
+void
+eel_canvas_w2c (EelCanvas *canvas,
+                double     wx,
+                double     wy,
+                int       *cx,
+                int       *cy)
+{
+    double zoom;
+
+    g_return_if_fail (EEL_IS_CANVAS (canvas));
+
+    zoom = canvas->pixels_per_unit;
+
+    if (cx)
+    {
+        *cx = floor ((wx - canvas->scroll_x1) * zoom + canvas->zoom_xofs + 0.5);
+    }
+    if (cy)
+    {
+        *cy = floor ((wy - canvas->scroll_y1) * zoom + canvas->zoom_yofs + 0.5);
+    }
+}
+
+/**
+ * eel_canvas_w2c:
+ * @canvas: A canvas.
+ * @world: rectangle in world coordinates.
+ * @canvas: rectangle in canvase coordinates.
+ *
+ * Converts rectangles in world coordinates into canvas pixel coordinates.
+ **/
+void
+eel_canvas_w2c_rect_d (EelCanvas *canvas,
+                       double    *x1,
+                       double    *y1,
+                       double    *x2,
+                       double    *y2)
+{
+    eel_canvas_w2c_d (canvas,
+                      *x1, *y1,
+                      x1, y1);
+    eel_canvas_w2c_d (canvas,
+                      *x2, *y2,
+                      x2, y2);
+}
+
+
+
+/**
+ * eel_canvas_w2c_d:
+ * @canvas: A canvas.
+ * @wx: World X coordinate.
+ * @wy: World Y coordinate.
+ * @cx: X pixel coordinate (return value).
+ * @cy: Y pixel coordinate (return value).
+ *
+ * Converts world coordinates into canvas pixel coordinates.  This version
+ * produces coordinates in floating point coordinates, for greater precision.
+ **/
+void
+eel_canvas_w2c_d (EelCanvas *canvas,
+                  double     wx,
+                  double     wy,
+                  double    *cx,
+                  double    *cy)
+{
+    double zoom;
+
+    g_return_if_fail (EEL_IS_CANVAS (canvas));
+
+    zoom = canvas->pixels_per_unit;
+
+    if (cx)
+    {
+        *cx = (wx - canvas->scroll_x1) * zoom + canvas->zoom_xofs;
+    }
+    if (cy)
+    {
+        *cy = (wy - canvas->scroll_y1) * zoom + canvas->zoom_yofs;
+    }
+}
+
+
+/**
+ * eel_canvas_c2w:
+ * @canvas: A canvas.
+ * @cx: Canvas pixel X coordinate.
+ * @cy: Canvas pixel Y coordinate.
+ * @wx: X world coordinate (return value).
+ * @wy: Y world coordinate (return value).
+ *
+ * Converts canvas pixel coordinates to world coordinates.
+ **/
+void
+eel_canvas_c2w (EelCanvas *canvas,
+                int        cx,
+                int        cy,
+                double    *wx,
+                double    *wy)
+{
+    double zoom;
+
+    g_return_if_fail (EEL_IS_CANVAS (canvas));
+
+    zoom = canvas->pixels_per_unit;
+
+    if (wx)
+    {
+        *wx = (cx - canvas->zoom_xofs) / zoom + canvas->scroll_x1;
+    }
+    if (wy)
+    {
+        *wy = (cy - canvas->zoom_yofs) / zoom + canvas->scroll_y1;
+    }
+}
+
+
+/**
+ * eel_canvas_window_to_world:
+ * @canvas: A canvas.
+ * @winx: Window-relative X coordinate.
+ * @winy: Window-relative Y coordinate.
+ * @worldx: X world coordinate (return value).
+ * @worldy: Y world coordinate (return value).
+ *
+ * Converts window-relative coordinates into world coordinates.  You can use
+ * this when you need to convert mouse coordinates into world coordinates, for
+ * example.
+ * Window coordinates are really the same as canvas coordinates now, but this
+ * function is here for backwards compatibility reasons.
+ **/
+void
+eel_canvas_window_to_world (EelCanvas *canvas,
+                            double     winx,
+                            double     winy,
+                            double    *worldx,
+                            double    *worldy)
+{
+    g_return_if_fail (EEL_IS_CANVAS (canvas));
+
+    if (worldx)
+    {
+        *worldx = canvas->scroll_x1 + ((winx - canvas->zoom_xofs)
+                                       / canvas->pixels_per_unit);
+    }
+
+    if (worldy)
+    {
+        *worldy = canvas->scroll_y1 + ((winy - canvas->zoom_yofs)
+                                       / canvas->pixels_per_unit);
+    }
+}
+
+
+/**
+ * eel_canvas_world_to_window:
+ * @canvas: A canvas.
+ * @worldx: World X coordinate.
+ * @worldy: World Y coordinate.
+ * @winx: X window-relative coordinate.
+ * @winy: Y window-relative coordinate.
+ *
+ * Converts world coordinates into window-relative coordinates.
+ * Window coordinates are really the same as canvas coordinates now, but this
+ * function is here for backwards compatibility reasons.
+ **/
+void
+eel_canvas_world_to_window (EelCanvas *canvas,
+                            double     worldx,
+                            double     worldy,
+                            double    *winx,
+                            double    *winy)
+{
+    g_return_if_fail (EEL_IS_CANVAS (canvas));
+
+    if (winx)
+    {
+        *winx = (canvas->pixels_per_unit) * (worldx - canvas->scroll_x1) + canvas->zoom_xofs;
+    }
+
+    if (winy)
+    {
+        *winy = (canvas->pixels_per_unit) * (worldy - canvas->scroll_y1) + canvas->zoom_yofs;
+    }
+}
+
+static gboolean
+boolean_handled_accumulator (GSignalInvocationHint *ihint,
+                             GValue                *return_accu,
+                             const GValue          *handler_return,
+                             gpointer               dummy)
+{
+    gboolean continue_emission;
+    gboolean signal_handled;
+
+    signal_handled = g_value_get_boolean (handler_return);
+    g_value_set_boolean (return_accu, signal_handled);
+    continue_emission = !signal_handled;
+
+    return continue_emission;
+}
+
+static void
+eel_canvas_item_accessible_get_item_extents (EelCanvasItem *item,
+                                             GdkRectangle  *rect)
+{
+    double bx1, bx2, by1, by2;
+    gint scroll_x, scroll_y;
+    gint x1, x2, y1, y2;
+
+    eel_canvas_item_get_bounds (item, &bx1, &by1, &bx2, &by2);
+    eel_canvas_w2c_rect_d (item->canvas, &bx1, &by1, &bx2, &by2);
+    eel_canvas_get_scroll_offsets (item->canvas, &scroll_x, &scroll_y);
+    x1 = floor (bx1 + .5);
+    y1 = floor (by1 + .5);
+    x2 = floor (bx2 + .5);
+    y2 = floor (by2 + .5);
+    rect->x = x1 - scroll_x;
+    rect->y = y1 - scroll_y;
+    rect->width = x2 - x1;
+    rect->height = y2 - y1;
+}
+
+static gboolean
+eel_canvas_item_accessible_is_item_in_window (EelCanvasItem *item,
+                                              GdkRectangle  *rect)
+{
+    GtkWidget *widget;
+    gboolean retval;
+
+    widget = GTK_WIDGET (item->canvas);
+    if (gtk_widget_get_window (widget))
+    {
+        int window_width, window_height;
+
+        gdk_window_get_geometry (gtk_widget_get_window (widget), NULL, NULL,
+                                 &window_width, &window_height);
+        /*
+         * Check whether rectangles intersect
+         */
+        if (rect->x + rect->width < 0 ||
+            rect->y + rect->height < 0 ||
+            rect->x > window_width ||
+            rect->y > window_height)
+        {
+            retval = FALSE;
+        }
+        else
+        {
+            retval = TRUE;
+        }
+    }
+    else
+    {
+        retval = FALSE;
+    }
+    return retval;
+}
+
+
+static void
+eel_canvas_item_accessible_get_extents (AtkComponent *component,
+                                        gint         *x,
+                                        gint         *y,
+                                        gint         *width,
+                                        gint         *height,
+                                        AtkCoordType  coord_type)
+{
+    AtkGObjectAccessible *atk_gobj;
+    GObject *obj;
+    EelCanvasItem *item;
+    gint window_x, window_y;
+    gint toplevel_x, toplevel_y;
+    GdkRectangle rect;
+    GdkWindow *window;
+    GtkWidget *canvas;
+
+    atk_gobj = ATK_GOBJECT_ACCESSIBLE (component);
+    obj = atk_gobject_accessible_get_object (atk_gobj);
+
+    if (obj == NULL)
+    {
+        /* item is defunct */
+        return;
+    }
+
+    /* Get the CanvasItem */
+    item = EEL_CANVAS_ITEM (obj);
+
+    /* If this item has no parent canvas, something's broken */
+    g_return_if_fail (GTK_IS_WIDGET (item->canvas));
+
+    eel_canvas_item_accessible_get_item_extents (item, &rect);
+    *width = rect.width;
+    *height = rect.height;
+    if (!eel_canvas_item_accessible_is_item_in_window (item, &rect))
+    {
+        *x = G_MININT;
+        *y = G_MININT;
+        return;
+    }
+
+    canvas = GTK_WIDGET (item->canvas);
+    window = gtk_widget_get_parent_window (canvas);
+    gdk_window_get_origin (window, &window_x, &window_y);
+    *x = rect.x + window_x;
+    *y = rect.y + window_y;
+    if (coord_type == ATK_XY_WINDOW)
+    {
+        window = gdk_window_get_toplevel (gtk_widget_get_window (canvas));
+        gdk_window_get_origin (window, &toplevel_x, &toplevel_y);
+        *x -= toplevel_x;
+        *y -= toplevel_y;
+    }
+    return;
+}
+
+static gint
+eel_canvas_item_accessible_get_mdi_zorder (AtkComponent *component)
+{
+    AtkGObjectAccessible *atk_gobj;
+    GObject *g_obj;
+    EelCanvasItem *item;
+
+    atk_gobj = ATK_GOBJECT_ACCESSIBLE (component);
+    g_obj = atk_gobject_accessible_get_object (atk_gobj);
+    if (g_obj == NULL)
+    {
+        /* Object is defunct */
+        return -1;
+    }
+
+    item = EEL_CANVAS_ITEM (g_obj);
+    if (item->parent)
+    {
+        return g_list_index (EEL_CANVAS_GROUP (item->parent)->item_list, item);
+    }
+    else
+    {
+        g_return_val_if_fail (item->canvas->root == item, -1);
+        return 0;
+    }
+}
+
+static gboolean
+eel_canvas_item_accessible_grab_focus (AtkComponent *component)
+{
+    AtkGObjectAccessible *atk_gobj;
+    GObject *obj;
+    EelCanvasItem *item;
+    GtkWidget *toplevel;
+
+    atk_gobj = ATK_GOBJECT_ACCESSIBLE (component);
+    obj = atk_gobject_accessible_get_object (atk_gobj);
+
+    item = EEL_CANVAS_ITEM (obj);
+    if (item == NULL)
+    {
+        /* item is defunct */
+        return FALSE;
+    }
+
+    eel_canvas_item_grab_focus (item);
+    toplevel = gtk_widget_get_toplevel (GTK_WIDGET (item->canvas));
+    if (gtk_widget_is_toplevel (toplevel))
+    {
+        gtk_window_present (GTK_WINDOW (toplevel));
+    }
+
+    return TRUE;
+}
+
+static void
+eel_canvas_item_accessible_component_interface_init (AtkComponentIface *iface)
+{
+    g_return_if_fail (iface != NULL);
+
+    iface->get_extents = eel_canvas_item_accessible_get_extents;
+    iface->get_mdi_zorder = eel_canvas_item_accessible_get_mdi_zorder;
+    iface->grab_focus = eel_canvas_item_accessible_grab_focus;
+}
+
+static gboolean
+eel_canvas_item_accessible_is_item_on_screen (EelCanvasItem *item)
+{
+    GdkRectangle rect;
+
+    eel_canvas_item_accessible_get_item_extents (item, &rect);
+    return eel_canvas_item_accessible_is_item_in_window (item, &rect);
+}
+
+static void
+eel_canvas_item_accessible_initialize (AtkObject *obj,
+                                       gpointer   data)
+{
+    if (ATK_OBJECT_CLASS (accessible_item_parent_class)->initialize != NULL)
+    {
+        ATK_OBJECT_CLASS (accessible_item_parent_class)->initialize (obj, data);
+    }
+    g_object_set_data (G_OBJECT (obj), "atk-component-layer",
+                       GINT_TO_POINTER (ATK_LAYER_MDI));
+}
+
+static AtkStateSet *
+eel_canvas_item_accessible_ref_state_set (AtkObject *accessible)
+{
+    AtkGObjectAccessible *atk_gobj;
+    GObject *obj;
+    EelCanvasItem *item;
+    AtkStateSet *state_set;
+
+    state_set = ATK_OBJECT_CLASS (accessible_item_parent_class)->ref_state_set (accessible);
+    atk_gobj = ATK_GOBJECT_ACCESSIBLE (accessible);
+    obj = atk_gobject_accessible_get_object (atk_gobj);
+
+    item = EEL_CANVAS_ITEM (obj);
+    if (item == NULL)
+    {
+        atk_state_set_add_state (state_set, ATK_STATE_DEFUNCT);
+    }
+    else
+    {
+        if (item->flags & EEL_CANVAS_ITEM_VISIBLE)
+        {
+            atk_state_set_add_state (state_set, ATK_STATE_VISIBLE);
+
+            if (eel_canvas_item_accessible_is_item_on_screen (item))
+            {
+                atk_state_set_add_state (state_set, ATK_STATE_SHOWING);
+            }
+        }
+        if (gtk_widget_get_can_focus (GTK_WIDGET (item->canvas)))
+        {
+            atk_state_set_add_state (state_set, ATK_STATE_FOCUSABLE);
+
+            if (item->canvas->focused_item == item)
+            {
+                atk_state_set_add_state (state_set, ATK_STATE_FOCUSED);
+            }
+        }
+    }
+
+    return state_set;
+}
+
+static void
+eel_canvas_item_accessible_class_init (EelCanvasItemAccessibleClass *klass)
+{
+    AtkObjectClass *atk_class = ATK_OBJECT_CLASS (klass);
+
+    accessible_item_parent_class = g_type_class_peek_parent (klass);
+
+    atk_class->initialize = eel_canvas_item_accessible_initialize;
+    atk_class->ref_state_set = eel_canvas_item_accessible_ref_state_set;
+}
+
+static void
+eel_canvas_item_accessible_init (EelCanvasItemAccessible *self)
+{
+}
+
+G_DEFINE_TYPE_WITH_CODE (EelCanvasItemAccessible,
+                         eel_canvas_item_accessible,
+                         ATK_TYPE_GOBJECT_ACCESSIBLE,
+                         G_IMPLEMENT_INTERFACE (ATK_TYPE_COMPONENT,
+                                                eel_canvas_item_accessible_component_interface_init));
+
+static GType eel_canvas_item_accessible_factory_get_type (void);
+
+typedef AtkObjectFactory EelCanvasItemAccessibleFactory;
+typedef AtkObjectFactoryClass EelCanvasItemAccessibleFactoryClass;
+G_DEFINE_TYPE (EelCanvasItemAccessibleFactory, eel_canvas_item_accessible_factory,
+               ATK_TYPE_OBJECT_FACTORY)
+
+static GType
+eel_canvas_item_accessible_factory_get_accessible_type (void)
+{
+    return eel_canvas_item_accessible_get_type ();
+}
+
+static AtkObject *
+eel_canvas_item_accessible_factory_create_accessible (GObject *for_object)
+{
+    AtkObject *accessible;
+
+    accessible = g_object_new (eel_canvas_item_accessible_get_type (), NULL);
+    atk_object_initialize (accessible, for_object);
+    return accessible;
+}
+
+static void
+eel_canvas_item_accessible_factory_init (EelCanvasItemAccessibleFactory *self)
+{
+}
+
+static void
+eel_canvas_item_accessible_factory_class_init (AtkObjectFactoryClass *klass)
+{
+    klass->create_accessible = eel_canvas_item_accessible_factory_create_accessible;
+    klass->get_accessible_type = eel_canvas_item_accessible_factory_get_accessible_type;
+}
+
+/* Class initialization function for EelCanvasItemClass */
+static void
+eel_canvas_item_class_init (EelCanvasItemClass *klass)
+{
+    GObjectClass *gobject_class = (GObjectClass *) klass;
+
+    item_parent_class = g_type_class_peek_parent (klass);
+
+    gobject_class->set_property = eel_canvas_item_set_property;
+    gobject_class->get_property = eel_canvas_item_get_property;
+    gobject_class->dispose = eel_canvas_item_dispose;
+
+    g_object_class_install_property
+        (gobject_class, ITEM_PROP_VISIBLE,
+        g_param_spec_boolean ("visible", NULL, NULL,
+                              TRUE,
+                              G_PARAM_READWRITE));
+
+    item_signals[ITEM_EVENT] =
+        g_signal_new ("event",
+                      G_TYPE_FROM_CLASS (klass),
+                      G_SIGNAL_RUN_LAST,
+                      G_STRUCT_OFFSET (EelCanvasItemClass, event),
+                      boolean_handled_accumulator, NULL,
+                      g_cclosure_marshal_generic,
+                      G_TYPE_BOOLEAN, 1,
+                      GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE);
+
+    item_signals[ITEM_DESTROY] =
+        g_signal_new ("destroy",
+                      G_TYPE_FROM_CLASS (klass),
+                      G_SIGNAL_RUN_CLEANUP | G_SIGNAL_NO_RECURSE | G_SIGNAL_NO_HOOKS,
+                      G_STRUCT_OFFSET (EelCanvasItemClass, destroy),
+                      NULL, NULL,
+                      g_cclosure_marshal_VOID__VOID,
+                      G_TYPE_NONE, 0);
+
+    klass->realize = eel_canvas_item_realize;
+    klass->unrealize = eel_canvas_item_unrealize;
+    klass->map = eel_canvas_item_map;
+    klass->unmap = eel_canvas_item_unmap;
+    klass->update = eel_canvas_item_update;
+
+    atk_registry_set_factory_type (atk_get_default_registry (),
+                                   EEL_TYPE_CANVAS_ITEM,
+                                   eel_canvas_item_accessible_factory_get_type ());
+}