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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2020 Colomban Wendling <cwendling@hypra.fr>
* Copyright (C) 2012-2021 MATE Developers
*
* 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, 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 St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "msd-a11y-keyboard-atspi.h"
#include <glib-object.h>
#include <gdk/gdk.h>
#include <atspi/atspi.h>
struct _MsdA11yKeyboardAtspi
{
GObject parent;
AtspiDeviceListener *listener;
gboolean listening;
};
G_DEFINE_TYPE (MsdA11yKeyboardAtspi, msd_a11y_keyboard_atspi, G_TYPE_OBJECT)
static void
msd_a11y_keyboard_atspi_finalize (GObject *obj)
{
MsdA11yKeyboardAtspi *self = MSD_A11Y_KEYBOARD_ATSPI (obj);
g_clear_object (&self->listener);
self->listening = FALSE;
G_OBJECT_CLASS (msd_a11y_keyboard_atspi_parent_class)->finalize (obj);
}
static void
msd_a11y_keyboard_atspi_class_init (MsdA11yKeyboardAtspiClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = msd_a11y_keyboard_atspi_finalize;
}
static gboolean
on_key_press_event (AtspiDeviceEvent *event,
void *user_data G_GNUC_UNUSED)
{
/* don't ring on capslock itself, that's taken care of by togglekeys
* if the user want it. */
if (event->id != GDK_KEY_Caps_Lock)
gdk_display_beep (gdk_display_get_default ());
/* cast the possible erroneous const away with atspi < 2.40 */
g_boxed_free (ATSPI_TYPE_DEVICE_EVENT, (gpointer) event);
return FALSE;
}
static void
msd_a11y_keyboard_atspi_init (MsdA11yKeyboardAtspi *self)
{
self->listener = NULL;
self->listening = FALSE;
#ifndef DESTROYING_ATSPI_LISTENER_DOES_NOT_CRASH
/* init AT-SPI if needed */
atspi_init ();
self->listener = atspi_device_listener_new (on_key_press_event,
self, NULL);
/* leak a reference so that this listener is *never* destroyed, to
* prevent the crash even if our object gets destroyed.
* See https://gitlab.gnome.org/GNOME/at-spi2-core/-/issues/22 */
g_object_ref (self->listener);
#endif
}
static void
register_deregister_events (MsdA11yKeyboardAtspi *self,
gboolean do_register)
{
g_return_if_fail (MSD_IS_A11Y_KEYBOARD_ATSPI (self));
g_return_if_fail (ATSPI_IS_DEVICE_LISTENER (self->listener));
/* register listeners for all keys with CAPS_LOCK modifier */
for (AtspiKeyMaskType mod_mask = 0; mod_mask < 256; mod_mask++)
{
if (! (mod_mask & (1 << ATSPI_MODIFIER_SHIFTLOCK)))
continue;
if (do_register)
atspi_register_keystroke_listener (self->listener,
NULL,
mod_mask,
1 << ATSPI_KEY_PRESSED_EVENT,
ATSPI_KEYLISTENER_NOSYNC,
NULL);
else
atspi_deregister_keystroke_listener (self->listener,
NULL,
mod_mask,
1 << ATSPI_KEY_PRESSED_EVENT,
NULL);
}
}
void
msd_a11y_keyboard_atspi_start (MsdA11yKeyboardAtspi *self)
{
g_return_if_fail (MSD_IS_A11Y_KEYBOARD_ATSPI (self));
if (self->listening)
return;
#ifdef DESTROYING_ATSPI_LISTENER_DOES_NOT_CRASH
/* init AT-SPI if needed */
atspi_init ();
self->listener = atspi_device_listener_new (on_key_press_event,
self, NULL);
#endif
register_deregister_events (self, TRUE);
self->listening = TRUE;
}
void
msd_a11y_keyboard_atspi_stop (MsdA11yKeyboardAtspi *self)
{
g_return_if_fail (MSD_IS_A11Y_KEYBOARD_ATSPI (self));
if (! self->listening)
return;
#ifdef DESTROYING_ATSPI_LISTENER_DOES_NOT_CRASH
g_clear_object (&self->listener);
#else
register_deregister_events (self, FALSE);
#endif
self->listening = FALSE;
}
MsdA11yKeyboardAtspi *
msd_a11y_keyboard_atspi_new ()
{
return g_object_new (MSD_TYPE_A11Y_KEYBOARD_ATSPI, NULL);
}
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