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clutter: Always snoop key events for a11y

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In the case a11y is required, the screen reader is very much
interested in getting an uniterrupted flow of key events. It attempts
so by setting a ::captured-event callback on the ClutterStage, but
that falls short with our MetaDisplay event handler, as clutter events
can be stopped before a11y gets a chance to see them.

This kind of selective amnesia wrt key events is not new, in X11 those
go unheard of by the WM as long as a client is focused and no grabs hold,
so it is clients' responsibility to talk with AT bridge.

This commit doesn't yet change that for X11, but we can do this right
away from the compositor on Wayland, and without any chance to be
tampered by clients.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1328
This commit is contained in:
Carlos Garnacho 2020-06-23 16:04:40 +02:00
parent 2e5b767c01
commit c90f39ace5
3 changed files with 13 additions and 113 deletions
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122
clutter/clutter/cally/cally-util.c
View File

@ -60,17 +60,6 @@ static const gchar * cally_util_get_toolkit_name (void);
static const gchar * cally_util_get_toolkit_version (void);
/* private */
static void cally_util_simulate_snooper_install (void);
static void cally_util_simulate_snooper_remove (void);
static gboolean cally_key_snooper (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data);
static void cally_util_stage_added_cb (ClutterStageManager *stage_manager,
ClutterStage *stage,
gpointer data);
static void cally_util_stage_removed_cb (ClutterStageManager *stage_manager,
ClutterStage *stage,
gpointer data);
static gboolean notify_hf (gpointer key,
gpointer value,
gpointer data);
@ -153,12 +142,8 @@ cally_util_add_key_event_listener (AtkKeySnoopFunc listener,
CallyKeyEventInfo *event_info = NULL;
if (!key_listener_list)
{
key_listener_list = g_hash_table_new_full (NULL, NULL, NULL, g_free);
cally_util_simulate_snooper_install ();
}
event_info = g_new (CallyKeyEventInfo, 1);
event_info->listener = listener;
event_info->func_data = data;
@ -179,75 +164,11 @@ cally_util_remove_key_event_listener (guint remove_listener)
{
g_hash_table_destroy (key_listener_list);
key_listener_list = NULL;
cally_util_simulate_snooper_remove ();
}
}
/* ------------------------------ PRIVATE FUNCTIONS ------------------------- */
/* Trying to emulate gtk_key_snooper install (a kind of wrapper). This
could be implemented without it, but I will maintain it in this
way, so if in the future clutter implements it natively it would be
easier the transition */
static void
cally_util_simulate_snooper_install (void)
{
ClutterStageManager *stage_manager = NULL;
ClutterStage *stage = NULL;
GSList *stage_list = NULL;
GSList *iter = NULL;
stage_manager = clutter_stage_manager_get_default ();
stage_list = clutter_stage_manager_list_stages (stage_manager);
for (iter = stage_list; iter != NULL; iter = g_slist_next (iter))
{
stage = CLUTTER_STAGE (iter->data);
g_signal_connect (G_OBJECT (stage), "captured-event",
G_CALLBACK (cally_key_snooper), NULL);
}
g_signal_connect (G_OBJECT (stage_manager), "stage-added",
G_CALLBACK (cally_util_stage_added_cb), cally_key_snooper);
g_signal_connect (G_OBJECT (stage_manager), "stage-removed",
G_CALLBACK (cally_util_stage_removed_cb), cally_key_snooper);
g_slist_free (stage_list);
}
static void
cally_util_simulate_snooper_remove (void)
{
ClutterStageManager *stage_manager = NULL;
ClutterStage *stage = NULL;
GSList *stage_list = NULL;
GSList *iter = NULL;
gint num = 0;
stage_manager = clutter_stage_manager_get_default ();
stage_list = clutter_stage_manager_list_stages (stage_manager);
for (iter = stage_list; iter != NULL; iter = g_slist_next (iter))
{
stage = CLUTTER_STAGE (iter->data);
num += g_signal_handlers_disconnect_by_func (stage, cally_key_snooper, NULL);
}
g_signal_handlers_disconnect_by_func (G_OBJECT (stage_manager),
G_CALLBACK (cally_util_stage_added_cb),
cally_key_snooper);
g_signal_handlers_disconnect_by_func (G_OBJECT (stage_manager),
G_CALLBACK (cally_util_stage_removed_cb),
cally_key_snooper);
#ifdef CALLY_DEBUG
g_print ("Number of snooper callbacks disconnected: %i\n", num);
#endif
}
static AtkKeyEventStruct *
atk_key_event_from_clutter_event_key (ClutterKeyEvent *clutter_event,
gunichar password_char)
@ -384,59 +305,34 @@ check_key_visibility (ClutterEvent *event)
return DEFAULT_PASSWORD_CHAR;
}
static gboolean
cally_key_snooper (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
gboolean
cally_snoop_key_event (ClutterKeyEvent *key)
{
ClutterEvent *event = (ClutterEvent *) key;
AtkKeyEventStruct *key_event = NULL;
gint consumed = 0;
gboolean consumed = FALSE;
gunichar password_char = 0;
/* filter key events */
if ((event->type != CLUTTER_KEY_PRESS) && (event->type != CLUTTER_KEY_RELEASE))
{
return FALSE;
}
password_char = check_key_visibility (event);
return FALSE;
if (key_listener_list)
{
GHashTable *new_hash = g_hash_table_new (NULL, NULL);
g_hash_table_foreach (key_listener_list, insert_hf, new_hash);
key_event = atk_key_event_from_clutter_event_key ((ClutterKeyEvent *)event,
password_char);
password_char = check_key_visibility (event);
key_event = atk_key_event_from_clutter_event_key (key, password_char);
/* func data is inside the hash table */
consumed = g_hash_table_foreach_steal (new_hash, notify_hf, key_event);
consumed = g_hash_table_foreach_steal (new_hash, notify_hf, key_event) > 0;
g_hash_table_destroy (new_hash);
g_free (key_event->string);
g_free (key_event);
}
return (consumed ? 1 : 0);
}
static void
cally_util_stage_added_cb (ClutterStageManager *stage_manager,
ClutterStage *stage,
gpointer data)
{
GCallback cally_key_snooper_cb = G_CALLBACK (data);
g_signal_connect (G_OBJECT (stage), "captured-event", cally_key_snooper_cb, NULL);
}
static void
cally_util_stage_removed_cb (ClutterStageManager *stage_manager,
ClutterStage *stage,
gpointer data)
{
GCallback cally_key_snooper_cb = G_CALLBACK (data);
g_signal_handlers_disconnect_by_func (stage, cally_key_snooper_cb, NULL);
return consumed;
}
void

2
clutter/clutter/cally/cally-util.h
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@ -79,6 +79,8 @@ GType cally_util_get_type (void) G_GNUC_CONST;
void _cally_util_override_atk_util (void);
gboolean cally_snoop_key_event (ClutterKeyEvent *key);
G_END_DECLS
#endif /* __CALLY_UTIL_H__ */

2
clutter/clutter/clutter-main.c
View File

@ -1653,6 +1653,8 @@ static inline void
emit_keyboard_event (ClutterEvent *event,
ClutterInputDevice *device)
{
cally_snoop_key_event ((ClutterKeyEvent *) event);
if (_clutter_event_process_filters (event))
return;