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/*
* Copyright (C) 2011 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* Authored by: Rodrigo Moya <rodrigo.moya@canonical.com>
*/
#include <gio/gio.h>
#include "panel-a11y.h"
#include "panel-util-accessible.h"
static gboolean a11y_initialized = FALSE;
#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"
/* This method is required because g_setting_new abort if the schema
is not present. */
static gboolean
has_gsettings_schema (const gchar *schema)
{
const char * const *list_schemas = NULL;
gboolean found = FALSE;
int i = 0;
list_schemas = g_settings_list_schemas ();
for (i = 0; list_schemas [i]; i++)
{
if (!g_strcmp0 (list_schemas[i], schema))
{
found = TRUE;
break;
}
}
return found;
}
static gboolean
should_enable_a11y (void)
{
GSettings *desktop_settings = NULL;
gboolean value = FALSE;
if (!has_gsettings_schema (DESKTOP_SCHEMA))
return 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 gchar*
get_atk_bridge_path (void)
{
GSettings *atspi_settings = NULL;
GVariant *variant = NULL;
char *value = NULL;
if (!has_gsettings_schema (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, (GModuleFlags)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;
}
void
panel_a11y_init (void)
{
gchar *bridge_path = NULL;
if (a11y_initialized)
return;
/* Restore environment to load AT bridge */
g_unsetenv ("NO_AT_BRIDGE");
g_unsetenv ("NO_GAIL");
if (!should_enable_a11y ())
return;
/* Load PanelUtilAccessible class */
g_type_class_unref (g_type_class_ref (PANEL_TYPE_UTIL_ACCESSIBLE));
bridge_path = get_atk_bridge_path ();
if (a11y_invoke_module (bridge_path))
{
g_debug ("Unity accessibility started, using bridge on %s", bridge_path);
}
g_free (bridge_path);
atk_get_root ();
a11y_initialized = TRUE;
}
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