ev-image-accessible.c

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
/* this file is part of evince, a gnome document viewer
 *
 * Copyright (C) 2014 Igalia
 * Author: Joanmarie Diggs <jdiggs@igalia.com>
 *
 * Evince 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.
 *
 * Evince 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);
}