Expose images as AtkObject children of the page

https://bugzilla.gnome.org/show_bug.cgi?id=728475

origin commit:
https://git.gnome.org/browse/evince/commit/?h=gnome-3-14&id=aea890c

1 files changed, 208 insertions, 0 deletions

diff --git a/libview/ev-image-accessible.c b/libview/ev-image-accessible.c
new file mode 100644
index 00000000..c07e7cc9
--- /dev/null
+++ b/libview/ev-image-accessible.c
@@ -0,0 +1,208 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
+/* this file is part of atril, a mate document viewer
+ *
+ * Copyright (C) 2014 Igalia
+ * Author: Joanmarie Diggs <[email protected]>
+ *
+ * Atril is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Atril 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <config.h>
+
+#include "ev-image-accessible.h"
+#include "ev-view-private.h"
+
+struct _EvImageAccessiblePrivate {
+        EvPageAccessible *page;
+        EvImage          *image;
+        EvRectangle       area;
+};
+
+static void ev_image_accessible_component_iface_init (AtkComponentIface *iface);
+static void ev_image_accessible_image_iface_init     (AtkImageIface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (EvImageAccessible, ev_image_accessible, ATK_TYPE_OBJECT,
+			 G_IMPLEMENT_INTERFACE (ATK_TYPE_COMPONENT, ev_image_accessible_component_iface_init)
+			 G_IMPLEMENT_INTERFACE (ATK_TYPE_IMAGE, ev_image_accessible_image_iface_init))
+
+static void
+ev_image_accessible_get_atk_rect (AtkObject    *atk_object,
+				  AtkCoordType  coord_type,
+				  EvRectangle  *atk_rect)
+{
+	EvImageAccessible *image;
+	EvViewAccessible *view_accessible;
+	gint page;
+
+	image = EV_IMAGE_ACCESSIBLE (atk_object);
+	view_accessible = ev_page_accessible_get_view_accessible (image->priv->page);
+	page = ev_page_accessible_get_page (image->priv->page);
+	_transform_doc_rect_to_atk_rect (view_accessible, page, &image->priv->area, atk_rect, coord_type);
+}
+
+static void
+ev_image_accessible_get_extents (AtkComponent *atk_component,
+				 gint         *x,
+				 gint         *y,
+				 gint         *width,
+				 gint         *height,
+				 AtkCoordType  coord_type)
+{
+	EvRectangle atk_rect;
+
+	ev_image_accessible_get_atk_rect (ATK_OBJECT (atk_component), coord_type, &atk_rect);
+	*x = atk_rect.x1;
+	*y = atk_rect.y1;
+	*width = atk_rect.x2 - atk_rect.x1;
+	*height = atk_rect.y2 - atk_rect.y1;
+}
+
+static void
+ev_image_accessible_component_iface_init (AtkComponentIface *iface)
+{
+	iface->get_extents = ev_image_accessible_get_extents;
+}
+
+static const gchar *
+ev_image_accessible_get_image_description (AtkImage *image)
+{
+	/* This will be obtainable for tagged PDFs */
+	return NULL;
+}
+
+static const gchar *
+ev_image_accessible_get_image_locale (AtkImage *atk_image)
+{
+	/* This will be obtainable for tagged PDFs */
+	return NULL;
+}
+
+static void
+ev_image_accessible_get_image_size (AtkImage *atk_image,
+				    int      *width,
+				    int      *height)
+{
+	EvRectangle atk_rect;
+
+	ev_image_accessible_get_atk_rect (ATK_OBJECT (atk_image), ATK_XY_WINDOW, &atk_rect);
+	*width = atk_rect.x2 - atk_rect.x1;
+	*height = atk_rect.y2 - atk_rect.y1;
+}
+
+static void
+ev_image_accessible_get_image_position (AtkImage     *atk_image,
+					gint         *x,
+					gint         *y,
+					AtkCoordType  coord_type)
+{
+	EvRectangle atk_rect;
+
+	ev_image_accessible_get_atk_rect (ATK_OBJECT (atk_image), ATK_XY_WINDOW, &atk_rect);
+	*x = atk_rect.x1;
+	*y = atk_rect.y1;
+}
+
+static AtkStateSet *
+ev_image_accessible_ref_state_set (AtkObject *atk_object)
+{
+	AtkStateSet *state_set;
+	AtkStateSet *copy_set;
+	AtkStateSet *page_accessible_state_set;
+	EvImageAccessible *self;
+	EvViewAccessible *view_accessible;
+	gint page;
+
+	self = EV_IMAGE_ACCESSIBLE (atk_object);
+	state_set = ATK_OBJECT_CLASS (ev_image_accessible_parent_class)->ref_state_set (atk_object);
+	atk_state_set_clear_states (state_set);
+
+	page_accessible_state_set = atk_object_ref_state_set (ATK_OBJECT (self->priv->page));
+	copy_set = atk_state_set_or_sets (state_set, page_accessible_state_set);
+	atk_state_set_remove_state (copy_set, ATK_STATE_FOCUSABLE);
+	atk_state_set_remove_state (copy_set, ATK_STATE_FOCUSED);
+
+	view_accessible = ev_page_accessible_get_view_accessible (self->priv->page);
+	page = ev_page_accessible_get_page (self->priv->page);
+	if (!ev_view_accessible_is_doc_rect_showing (view_accessible, page, &self->priv->area))
+		atk_state_set_remove_state (copy_set, ATK_STATE_SHOWING);
+
+	g_object_unref (state_set);
+	g_object_unref (page_accessible_state_set);
+
+	return copy_set;
+}
+
+static AtkObject *
+ev_image_accessible_get_parent (AtkObject *atk_object)
+{
+	EvImageAccessiblePrivate *priv = EV_IMAGE_ACCESSIBLE (atk_object)->priv;
+
+	return ATK_OBJECT (priv->page);
+}
+
+static void
+ev_image_accessible_finalize (GObject *object)
+{
+	EvImageAccessiblePrivate *priv = EV_IMAGE_ACCESSIBLE (object)->priv;
+
+	g_object_unref (priv->image);
+
+	G_OBJECT_CLASS (ev_image_accessible_parent_class)->finalize (object);
+}
+
+static void
+ev_image_accessible_class_init (EvImageAccessibleClass *klass)
+{
+	GObjectClass *object_class = G_OBJECT_CLASS (klass);
+	AtkObjectClass *atk_class = ATK_OBJECT_CLASS (klass);
+
+	object_class->finalize = ev_image_accessible_finalize;
+	atk_class->get_parent = ev_image_accessible_get_parent;
+	atk_class->ref_state_set = ev_image_accessible_ref_state_set;
+
+	g_type_class_add_private (klass, sizeof (EvImageAccessiblePrivate));
+}
+
+static void
+ev_image_accessible_init (EvImageAccessible *image)
+{
+	atk_object_set_role (ATK_OBJECT (image), ATK_ROLE_IMAGE);
+
+	image->priv = G_TYPE_INSTANCE_GET_PRIVATE (image, EV_TYPE_IMAGE_ACCESSIBLE, EvImageAccessiblePrivate);
+}
+
+static void
+ev_image_accessible_image_iface_init (AtkImageIface *iface)
+{
+	iface->get_image_description = ev_image_accessible_get_image_description;
+	iface->get_image_locale = ev_image_accessible_get_image_locale;
+	iface->get_image_position = ev_image_accessible_get_image_position;
+	iface->get_image_size = ev_image_accessible_get_image_size;
+}
+
+EvImageAccessible *
+ev_image_accessible_new (EvPageAccessible *page,
+			 EvImage          *image,
+			 EvRectangle      *area)
+{
+	EvImageAccessible *atk_image;
+
+	atk_image = g_object_new (EV_TYPE_IMAGE_ACCESSIBLE, NULL);
+	atk_image->priv->page = page;
+	atk_image->priv->image = g_object_ref (image);
+	atk_image->priv->area = *area;
+
+	return EV_IMAGE_ACCESSIBLE (atk_image);
+}