backends: Implement A11y monitor interface
Implement the org.freedesktop.a11y.KeyboardMonitor interface, allowing screen readers to interact with Mutter and grab shortcuts or full keyboard interaction. Carlos Garnacho: Move setup to ::constructed. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4217>
This commit is contained in:
Lukáš Tyrychtr
Marge Bot
parent
f4ce1e8a46
commit
0bcda4ecf4
@ -44,14 +44,253 @@ enum
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static GParamSpec *props[N_PROPS];
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typedef struct _MetaA11yKeystroke
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{
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uint32_t keysym;
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ClutterModifierType modifiers;
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} MetaA11yKeystroke;
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typedef struct _MetaA11yKeyGrabber
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{
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MetaA11yManager *manager;
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GDBusConnection *connection;
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char *bus_name;
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guint bus_name_watcher_id;
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gboolean grab_all;
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GArray *modifiers;
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GArray *keystrokes;
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} MetaA11yKeyGrabber;
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typedef struct _MetaA11yManager
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{
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GObject parent;
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MetaBackend *backend;
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guint dbus_name_id;
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MetaDBusKeyboardMonitor *keyboard_monitor_skeleton;
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GList *key_grabbers;
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GHashTable *grabbed_keypresses;
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GHashTable *all_grabbed_modifiers;
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} MetaA11yManager;
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G_DEFINE_TYPE (MetaA11yManager, meta_a11y_manager, G_TYPE_OBJECT)
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static void
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key_grabber_free (MetaA11yKeyGrabber *grabber)
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{
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if (grabber->bus_name_watcher_id)
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{
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g_bus_unwatch_name (grabber->bus_name_watcher_id);
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grabber->bus_name_watcher_id = 0;
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}
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g_clear_pointer (&grabber->keystrokes, g_array_unref);
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g_clear_pointer (&grabber->modifiers, g_array_unref);
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g_clear_object (&grabber->connection);
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g_clear_pointer (&grabber->bus_name, g_free);
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g_free (grabber);
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}
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static void
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rebuild_all_grabbed_modifiers (MetaA11yManager *a11y_manager,
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MetaA11yKeyGrabber *ignored_grabber)
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{
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GList *l;
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int i;
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g_hash_table_remove_all (a11y_manager->all_grabbed_modifiers);
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for (l = a11y_manager->key_grabbers; l; l = l->next)
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{
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MetaA11yKeyGrabber *grabber = l->data;
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if (grabber == ignored_grabber)
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continue;
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for (i = 0; i < grabber->modifiers->len; i++)
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{
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uint32_t modifier_keysym = g_array_index (grabber->modifiers, uint32_t, i);
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g_hash_table_add (a11y_manager->all_grabbed_modifiers,
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GUINT_TO_POINTER (modifier_keysym));
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}
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}
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}
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static void
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key_grabber_bus_name_vanished_callback (GDBusConnection *connection,
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const char *name,
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gpointer user_data)
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{
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MetaA11yKeyGrabber *grabber = user_data;
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MetaA11yManager *a11y_manager = grabber->manager;
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grabber->manager->key_grabbers =
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g_list_remove (grabber->manager->key_grabbers, grabber);
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if (grabber->modifiers)
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{
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rebuild_all_grabbed_modifiers (a11y_manager, grabber);
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g_signal_emit (grabber->manager, signals[A11Y_MODIFIERS_CHANGED], 0);
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}
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key_grabber_free (grabber);
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}
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static MetaA11yKeyGrabber *
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ensure_key_grabber (MetaA11yManager *a11y_manager,
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GDBusMethodInvocation *invocation)
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{
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GDBusConnection *connection =
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g_dbus_method_invocation_get_connection (invocation);
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const char *sender = g_dbus_method_invocation_get_sender (invocation);
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MetaA11yKeyGrabber *grabber;
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GList *l;
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for (l = a11y_manager->key_grabbers; l; l = l->next)
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{
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grabber = l->data;
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if (g_strcmp0 (grabber->bus_name, sender) == 0)
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return grabber;
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}
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grabber = g_new0 (MetaA11yKeyGrabber, 1);
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grabber->manager = a11y_manager;
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grabber->bus_name = g_strdup (sender);
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grabber->connection = g_object_ref (connection);
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grabber->bus_name_watcher_id =
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g_bus_watch_name_on_connection (connection,
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grabber->bus_name,
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G_BUS_NAME_WATCHER_FLAGS_NONE,
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NULL,
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key_grabber_bus_name_vanished_callback,
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grabber,
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NULL);
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a11y_manager->key_grabbers =
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g_list_prepend (a11y_manager->key_grabbers, grabber);
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return grabber;
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}
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static gboolean
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handle_grab_keyboard (MetaDBusKeyboardMonitor *skeleton,
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GDBusMethodInvocation *invocation,
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MetaA11yManager *a11y_manager)
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{
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MetaA11yKeyGrabber *grabber;
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grabber = ensure_key_grabber (a11y_manager, invocation);
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grabber->grab_all = TRUE;
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meta_dbus_keyboard_monitor_complete_grab_keyboard (skeleton, invocation);
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return G_DBUS_METHOD_INVOCATION_HANDLED;
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}
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static gboolean
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handle_ungrab_keyboard (MetaDBusKeyboardMonitor *skeleton,
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GDBusMethodInvocation *invocation,
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MetaA11yManager *a11y_manager)
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{
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MetaA11yKeyGrabber *grabber;
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grabber = ensure_key_grabber (a11y_manager, invocation);
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grabber->grab_all = FALSE;
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meta_dbus_keyboard_monitor_complete_ungrab_keyboard (skeleton, invocation);
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return G_DBUS_METHOD_INVOCATION_HANDLED;
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}
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static gboolean
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handle_set_key_grabs (MetaDBusKeyboardMonitor *skeleton,
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GDBusMethodInvocation *invocation,
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GVariant *modifiers,
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GVariant *keystrokes,
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MetaA11yManager *a11y_manager)
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{
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MetaA11yKeyGrabber *grabber;
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GVariantIter iter;
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uint32_t modifier_keysym;
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MetaA11yKeystroke keystroke;
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grabber = ensure_key_grabber (a11y_manager, invocation);
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g_clear_pointer (&grabber->modifiers, g_array_unref);
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g_clear_pointer (&grabber->keystrokes, g_array_unref);
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grabber->modifiers = g_array_new (FALSE, FALSE, sizeof (uint32_t));
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grabber->keystrokes = g_array_new (FALSE, FALSE, sizeof (MetaA11yKeystroke));
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g_variant_iter_init (&iter, modifiers);
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while (g_variant_iter_next (&iter, "u", &modifier_keysym))
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g_array_append_val (grabber->modifiers, modifier_keysym);
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g_variant_iter_init (&iter, keystrokes);
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while (g_variant_iter_next (&iter, "(uu)", &keystroke.keysym,
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&keystroke.modifiers))
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g_array_append_val (grabber->keystrokes, keystroke);
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rebuild_all_grabbed_modifiers (a11y_manager, NULL);
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g_signal_emit (a11y_manager, signals[A11Y_MODIFIERS_CHANGED], 0);
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meta_dbus_keyboard_monitor_complete_set_key_grabs (skeleton, invocation);
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return G_DBUS_METHOD_INVOCATION_HANDLED;
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}
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static void
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on_bus_acquired (GDBusConnection *connection,
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const char *name,
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gpointer user_data)
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{
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MetaA11yManager *manager = user_data;
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manager->keyboard_monitor_skeleton = meta_dbus_keyboard_monitor_skeleton_new ();
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g_signal_connect (manager->keyboard_monitor_skeleton, "handle-grab-keyboard",
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G_CALLBACK (handle_grab_keyboard), manager);
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g_signal_connect (manager->keyboard_monitor_skeleton, "handle-ungrab-keyboard",
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G_CALLBACK (handle_ungrab_keyboard), manager);
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g_signal_connect (manager->keyboard_monitor_skeleton, "handle-set-key-grabs",
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G_CALLBACK (handle_set_key_grabs), manager);
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g_dbus_interface_skeleton_export (G_DBUS_INTERFACE_SKELETON (manager->keyboard_monitor_skeleton),
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connection,
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"/org/freedesktop/a11y/Manager",
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NULL);
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}
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static void
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on_name_acquired (GDBusConnection *connection,
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const char *name,
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gpointer user_data)
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{
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g_debug ("Acquired name %s", name);
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}
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static void
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on_name_lost (GDBusConnection *connection,
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const char *name,
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gpointer user_data)
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{
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g_debug ("Lost or failed to acquire name %s", name);
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}
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static void
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meta_a11y_manager_finalize (GObject *object)
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{
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MetaA11yManager *a11y_manager = META_A11Y_MANAGER (object);
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g_list_free_full (a11y_manager->key_grabbers,
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(GDestroyNotify) key_grabber_free);
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g_clear_object (&a11y_manager->keyboard_monitor_skeleton);
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g_clear_pointer (&a11y_manager->grabbed_keypresses, g_hash_table_destroy);
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g_clear_pointer (&a11y_manager->all_grabbed_modifiers, g_hash_table_destroy);
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g_bus_unown_name (a11y_manager->dbus_name_id);
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G_OBJECT_CLASS (meta_a11y_manager_parent_class)->finalize (object);
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}
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static void
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meta_a11y_manager_set_property (GObject *object,
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guint prop_id,
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@ -71,12 +310,47 @@ meta_a11y_manager_set_property (GObject *object,
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}
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}
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static void
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meta_a11y_manager_constructed (GObject *object)
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{
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MetaA11yManager *a11y_manager = META_A11Y_MANAGER (object);
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MetaContext *context;
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g_assert (a11y_manager->backend);
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context = meta_backend_get_context (a11y_manager->backend);
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a11y_manager->grabbed_keypresses = g_hash_table_new (NULL, NULL);
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a11y_manager->all_grabbed_modifiers = g_hash_table_new (NULL, NULL);
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a11y_manager->dbus_name_id =
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g_bus_own_name (G_BUS_TYPE_SESSION,
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"org.freedesktop.a11y.Manager",
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G_BUS_NAME_OWNER_FLAGS_ALLOW_REPLACEMENT |
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(meta_context_is_replacing (context) ?
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G_BUS_NAME_OWNER_FLAGS_REPLACE :
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G_BUS_NAME_OWNER_FLAGS_NONE),
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on_bus_acquired,
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on_name_acquired,
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on_name_lost,
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a11y_manager,
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NULL);
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}
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static void
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meta_a11y_manager_class_init (MetaA11yManagerClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->finalize = meta_a11y_manager_finalize;
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object_class->set_property = meta_a11y_manager_set_property;
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object_class->constructed = meta_a11y_manager_constructed;
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signals[A11Y_MODIFIERS_CHANGED] =
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g_signal_new ("a11y-modifiers-changed",
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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0, NULL, NULL, NULL,
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G_TYPE_NONE, 0);
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props[PROP_BACKEND] =
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g_param_spec_object ("backend", NULL, NULL,
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