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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (C) 2010 Igalia, S.L.
*
* Author: Alejandro Piñeiro Iglesias <apinheiro@igalia.com>
*
* This program 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.
*
* This program 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 - Suite 500, Boston, MA 02110-1335, USA.
*
*/
#include <string.h>
#include <gmodule.h>
#include <clutter/clutter.h>
#include "cinnamon-a11y.h"
#define INIT_METHOD "gnome_accessibility_module_init"
#define DESKTOP_SCHEMA "org.gnome.desktop.interface"
#define ACCESSIBILITY_ENABLED_KEY "toolkit-accessibility"
#define AT_SPI_SCHEMA "org.a11y.atspi"
#define ATK_BRIDGE_LOCATION_KEY "atk-bridge-location"
static gboolean
should_enable_a11y (void)
{
GSettings *desktop_settings = NULL;
gboolean value = FALSE;
desktop_settings = g_settings_new (DESKTOP_SCHEMA);
value = g_settings_get_boolean (desktop_settings, ACCESSIBILITY_ENABLED_KEY);
g_object_unref (desktop_settings);
return value;
}
static char*
get_atk_bridge_path (void)
{
GSettings *atspi_settings = NULL;
GVariant *variant = NULL;
char *value = NULL;
const char * const *schemas = NULL;
gboolean found = FALSE;
int i = 0;
schemas = g_settings_list_schemas ();
for (i = 0; schemas [i]; i++)
{
if (!strcmp (schemas[i], AT_SPI_SCHEMA))
{
found = TRUE;
break;
}
}
if (!found)
{
g_warning ("Accessibility: %s schema not found. Are you sure that at-spi or"
" at-spi2 is installed on your system?", AT_SPI_SCHEMA);
return NULL;
}
atspi_settings = g_settings_new (AT_SPI_SCHEMA);
variant = g_settings_get_value (atspi_settings, ATK_BRIDGE_LOCATION_KEY);
value = g_variant_dup_bytestring (variant, NULL);
g_variant_unref (variant);
g_object_unref (atspi_settings);
return value;
}
static gboolean
a11y_invoke_module (const char *module_path)
{
GModule *handle;
void (*invoke_fn) (void);
if (!module_path)
{
g_warning ("Accessibility: invalid module path (NULL)");
return FALSE;
}
if (!(handle = g_module_open (module_path, 0)))
{
g_warning ("Accessibility: failed to load module '%s': '%s'",
module_path, g_module_error ());
return FALSE;
}
if (!g_module_symbol (handle, INIT_METHOD, (gpointer *)&invoke_fn))
{
g_warning ("Accessibility: error library '%s' does not include "
"method '%s' required for accessibility support",
module_path, INIT_METHOD);
g_module_close (handle);
return FALSE;
}
invoke_fn ();
return TRUE;
}
/*
* It loads the atk-bridge if required. It checks:
* * If the proper gsetting key is set
* * If clutter has already enabled the accessibility
*
* You need to ensure that the atk-bridge was not loaded before this
* call, because in that case the application would be already
* registered on at-spi using the AtkUtil implementation on that
* moment (if any, although without anyone the application would
* crash). Anyway this is the reason of NO_AT_BRIDGE.
*
*/
void
cinnamon_a11y_init (void)
{
char *bridge_path = NULL;
if (!should_enable_a11y ())
return;
if (clutter_get_accessibility_enabled () == FALSE)
{
g_warning ("Accessibility: clutter has no accessibility enabled"
" skipping the atk-bridge load");
return;
}
bridge_path = get_atk_bridge_path ();
if (a11y_invoke_module (bridge_path) == FALSE)
{
g_warning ("Accessibility: error loading the atk-bridge. Although the"
" accessibility on the system is enabled and clutter"
" accessibility is also enabled, accessibility support on"
" Cinnamon will not work");
}
/* NOTE: We avoid to load gail module, as gail-cally interaction is
* not fully supported right now.
*/
g_free (bridge_path);
}
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