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a11y: Move ATContext to an explicit realization model

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We are doing too much work during the construction phase of the
AT-SPI backend for GtkATContext. Instead of having the AtSpiContext
register itself at construction time, let's add explicit realize
and unrealize operations, and connect the ATContext realization to the
rooting operation of a GtkWidget.
This commit is contained in:
Emmanuele Bassi 2020-10-19 17:44:50 +01:00
parent 499e4b4c50
commit 30210c7087
6 changed files with 244 additions and 73 deletions
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192
gtk/a11y/gtkatspicontext.c
View File

@ -307,11 +307,8 @@ collect_relations (GtkAtSpiContext *self,
GtkAccessibleValue *value;
GList *list, *l;
GtkATContext *target_ctx;
const char *unique_name;
int i;
unique_name = g_dbus_connection_get_unique_name (self->connection);
for (i = 0; i < G_N_ELEMENTS (map); i++)
{
if (!gtk_at_context_has_accessible_relation (ctx, map[i].r))
@ -325,9 +322,12 @@ collect_relations (GtkAtSpiContext *self,
for (l = list; l; l = l->next)
{
target_ctx = gtk_accessible_get_at_context (GTK_ACCESSIBLE (l->data));
g_variant_builder_add (&b, "(so)",
unique_name,
GTK_AT_SPI_CONTEXT (target_ctx)->context_path);
/* Realize the ATContext of the target, so we can ask for its ref */
gtk_at_context_realize (target_ctx);
g_variant_builder_add (&b, "@(so)",
gtk_at_spi_context_to_ref (GTK_AT_SPI_CONTEXT (target_ctx)));
}
g_variant_builder_add (builder, "(ua(so))", map[i].s, &b);
@ -457,8 +457,6 @@ handle_accessible_method (GDBusConnection *connection,
GtkATContext *context = NULL;
GtkAccessible *accessible;
int idx, real_idx = 0;
const char *name;
const char *path;
g_variant_get (parameters, "(i)", &idx);
@ -512,10 +510,12 @@ handle_accessible_method (GDBusConnection *connection,
return;
}
name = g_dbus_connection_get_unique_name (self->connection);
path = gtk_at_spi_context_get_context_path (GTK_AT_SPI_CONTEXT (context));
/* Realize the child ATContext in order to get its ref */
gtk_at_context_realize (context);
g_dbus_method_invocation_return_value (invocation, g_variant_new ("((so))", name, path));
GVariant *ref = gtk_at_spi_context_to_ref (GTK_AT_SPI_CONTEXT (context));
g_dbus_method_invocation_return_value (invocation, g_variant_new ("(@(so))", ref));
}
else if (g_strcmp0 (method_name, "GetChildren") == 0)
{
@ -536,10 +536,13 @@ handle_accessible_method (GDBusConnection *connection,
GtkATContext *context = gtk_accessible_get_at_context (GTK_ACCESSIBLE (child));
const char *name = g_dbus_connection_get_unique_name (self->connection);
const char *path = gtk_at_spi_context_get_context_path (GTK_AT_SPI_CONTEXT (context));
/* Realize the child ATContext in order to get its ref */
gtk_at_context_realize (context);
g_variant_builder_add (&builder, "(so)", name, path);
GVariant *ref = gtk_at_spi_context_to_ref (GTK_AT_SPI_CONTEXT (context));
if (ref != NULL)
g_variant_builder_add (&builder, "@(so)", ref);
}
}
else if (GTK_IS_STACK_PAGE (accessible))
@ -549,9 +552,14 @@ handle_accessible_method (GDBusConnection *connection,
if (gtk_accessible_should_present (GTK_ACCESSIBLE (child)))
{
GtkATContext *context = gtk_accessible_get_at_context (GTK_ACCESSIBLE (child));
const char *name = g_dbus_connection_get_unique_name (self->connection);
const char *path = gtk_at_spi_context_get_context_path (GTK_AT_SPI_CONTEXT (context));
g_variant_builder_add (&builder, "(so)", name, path);
/* Realize the child ATContext in order to get its ref */
gtk_at_context_realize (context);
GVariant *ref = gtk_at_spi_context_to_ref (GTK_AT_SPI_CONTEXT (context));
if (ref != NULL)
g_variant_builder_add (&builder, "@(so)", ref);
}
}
@ -579,7 +587,7 @@ handle_accessible_method (GDBusConnection *connection,
else if (g_strcmp0 (method_name, "GetRelationSet") == 0)
{
GVariantBuilder builder = G_VARIANT_BUILDER_INIT (G_VARIANT_TYPE ("a(ua(so))"));
collect_relations (self, &builder);
collect_relations (self, &builder);
g_dbus_method_invocation_return_value (invocation, g_variant_new ("(a(ua(so)))", &builder));
}
else if (g_strcmp0 (method_name, "GetInterfaces") == 0)
@ -637,9 +645,7 @@ handle_accessible_get_property (GDBusConnection *connection,
gtk_accessible_get_at_context (GTK_ACCESSIBLE (page));
if (parent_context != NULL)
res = g_variant_new ("(so)",
g_dbus_connection_get_unique_name (self->connection),
GTK_AT_SPI_CONTEXT (parent_context)->context_path);
res = gtk_at_spi_context_to_ref (GTK_AT_SPI_CONTEXT (parent_context));
}
else
{
@ -647,9 +653,7 @@ handle_accessible_get_property (GDBusConnection *connection,
gtk_accessible_get_at_context (GTK_ACCESSIBLE (parent));
if (parent_context != NULL)
res = g_variant_new ("(so)",
g_dbus_connection_get_unique_name (self->connection),
GTK_AT_SPI_CONTEXT (parent_context)->context_path);
res = gtk_at_spi_context_to_ref (GTK_AT_SPI_CONTEXT (parent_context));
}
}
else if (GTK_IS_STACK_PAGE (accessible))
@ -659,9 +663,7 @@ handle_accessible_get_property (GDBusConnection *connection,
gtk_accessible_get_at_context (GTK_ACCESSIBLE (parent));
if (parent_context != NULL)
res = g_variant_new ("(so)",
g_dbus_connection_get_unique_name (self->connection),
GTK_AT_SPI_CONTEXT (parent_context)->context_path);
res = gtk_at_spi_context_to_ref (GTK_AT_SPI_CONTEXT (parent_context));
}
if (res == NULL)
@ -713,6 +715,9 @@ emit_text_changed (GtkAtSpiContext *self,
int end,
const char *text)
{
if (self->connection == NULL)
return;
g_dbus_connection_emit_signal (self->connection,
NULL,
self->context_path,
@ -728,6 +733,9 @@ emit_text_selection_changed (GtkAtSpiContext *self,
const char *kind,
int cursor_position)
{
if (self->connection == NULL)
return;
if (strcmp (kind, "text-caret-moved") == 0)
g_dbus_connection_emit_signal (self->connection,
NULL,
@ -752,6 +760,9 @@ static void
emit_selection_changed (GtkAtSpiContext *self,
const char *kind)
{
if (self->connection == NULL)
return;
g_dbus_connection_emit_signal (self->connection,
NULL,
self->context_path,
@ -767,6 +778,9 @@ emit_state_changed (GtkAtSpiContext *self,
const char *name,
gboolean enabled)
{
if (self->connection == NULL)
return;
g_dbus_connection_emit_signal (self->connection,
NULL,
self->context_path,
@ -777,11 +791,29 @@ emit_state_changed (GtkAtSpiContext *self,
NULL);
}
static void
emit_defunct (GtkAtSpiContext *self)
{
if (self->connection == NULL)
return;
g_dbus_connection_emit_signal (self->connection,
NULL,
self->context_path,
"org.a11y.atspi.Event.Object",
"StateChanged",
g_variant_new ("(siiva{sv})", "defunct", TRUE, 0, g_variant_new_string ("0"), NULL),
NULL);
}
static void
emit_property_changed (GtkAtSpiContext *self,
const char *name,
GVariant *value)
{
if (self->connection == NULL)
return;
g_dbus_connection_emit_signal (self->connection,
NULL,
self->context_path,
@ -799,6 +831,9 @@ emit_bounds_changed (GtkAtSpiContext *self,
int width,
int height)
{
if (self->connection == NULL)
return;
g_dbus_connection_emit_signal (self->connection,
NULL,
self->context_path,
@ -815,8 +850,12 @@ emit_children_changed (GtkAtSpiContext *self,
int idx,
GtkAccessibleChildState state)
{
GVariant *child_ref = gtk_at_spi_context_to_ref (child_context);
/* If we don't have a connection on either contexts, we cannot emit a signal */
if (self->connection == NULL || child_context->connection == NULL)
return;
GVariant *context_ref = gtk_at_spi_context_to_ref (self);
GVariant *child_ref = gtk_at_spi_context_to_ref (child_context);
gtk_at_spi_emit_children_changed (self->connection,
self->context_path,
@ -1312,6 +1351,10 @@ gtk_at_spi_context_register_object (GtkAtSpiContext *self)
}
self->interfaces = g_variant_ref_sink (g_variant_builder_end (&interfaces));
GTK_NOTE (A11Y, g_message ("Registered %d interfaces on object path '%s'",
self->n_registered_objects,
self->context_path));
}
static void
@ -1327,24 +1370,13 @@ gtk_at_spi_context_unregister_object (GtkAtSpiContext *self)
}
/* }}} */
/* {{{ GObject boilerplate */
static void
gtk_at_spi_context_dispose (GObject *gobject)
{
GtkAtSpiContext *self = GTK_AT_SPI_CONTEXT (gobject);
GtkAccessible *accessible = gtk_at_context_get_accessible (GTK_AT_CONTEXT (self));
gtk_at_spi_context_unregister_object (self);
gtk_atspi_disconnect_text_signals (accessible);
gtk_atspi_disconnect_selection_signals (accessible);
G_OBJECT_CLASS (gtk_at_spi_context_parent_class)->dispose (gobject);
}
static void
gtk_at_spi_context_finalize (GObject *gobject)
{
GtkAtSpiContext *self = GTK_AT_SPI_CONTEXT (gobject);
gtk_at_spi_context_unregister_object (self);
g_free (self->bus_address);
g_free (self->context_path);
g_clear_pointer (&self->interfaces, g_variant_unref);
@ -1394,29 +1426,10 @@ static void
gtk_at_spi_context_constructed (GObject *gobject)
{
GtkAtSpiContext *self = GTK_AT_SPI_CONTEXT (gobject);
GdkDisplay *display;
GdkDisplay *display = gtk_at_context_get_display (GTK_AT_CONTEXT (self));
g_assert (self->bus_address);
/* Every GTK application has a single root AT-SPI object, which
* handles all the global state, including the cache of accessible
* objects. We use the GdkDisplay to store it, so it's guaranteed
* to be unique per-display connection
*/
display = gtk_at_context_get_display (GTK_AT_CONTEXT (self));
self->root =
g_object_get_data (G_OBJECT (display), "-gtk-atspi-root");
if (self->root == NULL)
{
self->root = gtk_at_spi_root_new (self->bus_address);
g_object_set_data_full (G_OBJECT (display), "-gtk-atspi-root",
self->root,
g_object_unref);
}
self->connection = gtk_at_spi_root_get_connection (self->root);
/* We use the application's object path to build the path of each
* accessible object exposed on the accessibility bus; the path is
* also used to access the object cache
@ -1456,7 +1469,39 @@ gtk_at_spi_context_constructed (GObject *gobject)
g_free (base_path);
g_free (uuid);
GtkAccessible *accessible = gtk_at_context_get_accessible (GTK_AT_CONTEXT (self));
/* Every GTK application has a single root AT-SPI object, which
* handles all the global state, including the cache of accessible
* objects. We use the GdkDisplay to store it, so it's guaranteed
* to be unique per-display connection
*/
self->root =
g_object_get_data (G_OBJECT (display), "-gtk-atspi-root");
if (self->root == NULL)
{
self->root = gtk_at_spi_root_new (self->bus_address);
g_object_set_data_full (G_OBJECT (display), "-gtk-atspi-root",
self->root,
g_object_unref);
}
G_OBJECT_CLASS (gtk_at_spi_context_parent_class)->constructed (gobject);
}
static void
gtk_at_spi_context_realize (GtkATContext *context)
{
GtkAtSpiContext *self = GTK_AT_SPI_CONTEXT (context);
self->connection = gtk_at_spi_root_get_connection (self->root);
if (self->connection == NULL)
return;
GtkAccessible *accessible = gtk_at_context_get_accessible (context);
GTK_NOTE (A11Y, g_message ("Realizing ATSPI context at '%s' for accessible '%s'",
self->context_path,
G_OBJECT_TYPE_NAME (accessible)));
gtk_atspi_connect_text_signals (accessible,
(GtkAtspiTextChangedCallback *)emit_text_changed,
(GtkAtspiTextSelectionCallback *)emit_text_selection_changed,
@ -1466,7 +1511,25 @@ gtk_at_spi_context_constructed (GObject *gobject)
self);
gtk_at_spi_context_register_object (self);
G_OBJECT_CLASS (gtk_at_spi_context_parent_class)->constructed (gobject);
gtk_at_spi_root_queue_register (self->root);
}
static void
gtk_at_spi_context_unrealize (GtkATContext *context)
{
GtkAtSpiContext *self = GTK_AT_SPI_CONTEXT (context);
GtkAccessible *accessible = gtk_at_context_get_accessible (context);
GTK_NOTE (A11Y, g_message ("Unrealizing ATSPI context at '%s' for accessible '%s'",
self->context_path,
G_OBJECT_TYPE_NAME (accessible)));
/* Notify ATs that the accessible object is going away */
emit_defunct (self);
gtk_atspi_disconnect_text_signals (accessible);
gtk_atspi_disconnect_selection_signals (accessible);
gtk_at_spi_context_unregister_object (self);
}
static void
@ -1479,8 +1542,9 @@ gtk_at_spi_context_class_init (GtkAtSpiContextClass *klass)
gobject_class->set_property = gtk_at_spi_context_set_property;
gobject_class->get_property = gtk_at_spi_context_get_property;
gobject_class->finalize = gtk_at_spi_context_finalize;
gobject_class->dispose = gtk_at_spi_context_dispose;
context_class->realize = gtk_at_spi_context_realize;
context_class->unrealize = gtk_at_spi_context_unrealize;
context_class->state_change = gtk_at_spi_context_state_change;
context_class->platform_change = gtk_at_spi_context_platform_change;
context_class->bounds_change = gtk_at_spi_context_bounds_change;

46
gtk/a11y/gtkatspiroot.c
View File

@ -61,6 +61,7 @@ struct _GtkAtSpiRoot
char *desktop_path;
gint32 application_id;
guint register_id;
GtkAtSpiCache *cache;
@ -83,6 +84,8 @@ gtk_at_spi_root_finalize (GObject *gobject)
{
GtkAtSpiRoot *self = GTK_AT_SPI_ROOT (gobject);
g_clear_handle_id (&self->register_id, g_source_remove);
g_free (self->bus_address);
g_free (self->desktop_name);
g_free (self->desktop_path);
@ -499,9 +502,12 @@ on_registration_reply (GObject *gobject,
self->toplevels = gtk_window_get_toplevels ();
}
static void
gtk_at_spi_root_register (GtkAtSpiRoot *self)
static gboolean
root_register (gpointer data)
{
GtkAtSpiRoot *self = data;
const char *unique_name;
/* Register the root element; every application has a single root, so we only
* need to do this once.
*
@ -524,6 +530,8 @@ gtk_at_spi_root_register (GtkAtSpiRoot *self)
self->atspi_version = ATSPI_VERSION;
self->root_path = ATSPI_ROOT_PATH;
unique_name = g_dbus_connection_get_unique_name (self->connection);
g_dbus_connection_register_object (self->connection,
self->root_path,
(GDBusInterfaceInfo *) &atspi_application_interface,
@ -540,7 +548,7 @@ gtk_at_spi_root_register (GtkAtSpiRoot *self)
NULL);
GTK_NOTE (A11Y, g_message ("Registering (%s, %s) on the a11y bus",
g_dbus_connection_get_unique_name (self->connection),
unique_name,
self->root_path));
g_dbus_connection_call (self->connection,
@ -548,15 +556,37 @@ gtk_at_spi_root_register (GtkAtSpiRoot *self)
ATSPI_ROOT_PATH,
"org.a11y.atspi.Socket",
"Embed",
g_variant_new ("((so))",
g_dbus_connection_get_unique_name (self->connection),
self->root_path
),
g_variant_new ("((so))", unique_name, self->root_path),
G_VARIANT_TYPE ("((so))"),
G_DBUS_CALL_FLAGS_NONE, -1,
NULL,
on_registration_reply,
self);
self->register_id = 0;
return G_SOURCE_REMOVE;
}
/*< private >
* gtk_at_spi_root_queue_register:
* @self: a #GtkAtSpiRoot
*
* Queues the registration of the root object on the AT-SPI bus.
*/
void
gtk_at_spi_root_queue_register (GtkAtSpiRoot *self)
{
/* Ignore multiple registration requests while one is already in flight */
if (self->register_id != 0)
return;
/* The cache is only available once the registration succeeds */
if (self->cache != NULL)
return;
self->register_id = g_idle_add (root_register, self);
g_source_set_name_by_id (self->register_id, "[gtk] ATSPI root registration");
}
static void
@ -583,8 +613,6 @@ gtk_at_spi_root_constructed (GObject *gobject)
goto out;
}
gtk_at_spi_root_register (self);
out:
G_OBJECT_CLASS (gtk_at_spi_root_parent_class)->constructed (gobject);
}

3
gtk/a11y/gtkatspirootprivate.h
View File

@ -33,6 +33,9 @@ G_DECLARE_FINAL_TYPE (GtkAtSpiRoot, gtk_at_spi_root, GTK, AT_SPI_ROOT, GObject)
GtkAtSpiRoot *
gtk_at_spi_root_new (const char *bus_address);
void
gtk_at_spi_root_queue_register (GtkAtSpiRoot *self);
GDBusConnection *
gtk_at_spi_root_get_connection (GtkAtSpiRoot *self);

54
gtk/gtkatcontext.c
View File

@ -162,6 +162,16 @@ gtk_at_context_real_child_change (GtkATContext *self,
{
}
static void
gtk_at_context_real_realize (GtkATContext *self)
{
}
static void
gtk_at_context_real_unrealize (GtkATContext *self)
{
}
static void
gtk_at_context_class_init (GtkATContextClass *klass)
{
@ -171,6 +181,8 @@ gtk_at_context_class_init (GtkATContextClass *klass)
gobject_class->get_property = gtk_at_context_get_property;
gobject_class->finalize = gtk_at_context_finalize;
klass->realize = gtk_at_context_real_realize;
klass->unrealize = gtk_at_context_real_unrealize;
klass->state_change = gtk_at_context_real_state_change;
klass->platform_change = gtk_at_context_real_platform_change;
klass->bounds_change = gtk_at_context_real_bounds_change;
@ -511,6 +523,36 @@ gtk_at_context_create (GtkAccessibleRole accessible_role,
return res;
}
gboolean
gtk_at_context_is_realized (GtkATContext *self)
{
return self->realized;
}
void
gtk_at_context_realize (GtkATContext *self)
{
if (self->realized)
return;
GTK_NOTE (A11Y, g_message ("Realizing AT context '%s'", G_OBJECT_TYPE_NAME (self)));
GTK_AT_CONTEXT_GET_CLASS (self)->realize (self);
self->realized = TRUE;
}
void
gtk_at_context_unrealize (GtkATContext *self)
{
if (!self->realized)
return;
GTK_NOTE (A11Y, g_message ("Unrealizing AT context '%s'", G_OBJECT_TYPE_NAME (self)));
GTK_AT_CONTEXT_GET_CLASS (self)->unrealize (self);
self->realized = FALSE;
}
/*< private >
* gtk_at_context_update:
* @self: a #GtkATContext
@ -523,6 +565,9 @@ gtk_at_context_update (GtkATContext *self)
{
g_return_if_fail (GTK_IS_AT_CONTEXT (self));
if (!self->realized)
return;
/* There's no point in notifying of state changes if there weren't any */
if (self->updated_properties == 0 &&
self->updated_relations == 0 &&
@ -979,12 +1024,18 @@ void
gtk_at_context_platform_changed (GtkATContext *self,
GtkAccessiblePlatformChange change)
{
if (!self->realized)
return;
GTK_AT_CONTEXT_GET_CLASS (self)->platform_change (self, change);
}
void
gtk_at_context_bounds_changed (GtkATContext *self)
{
if (!self->realized)
return;
GTK_AT_CONTEXT_GET_CLASS (self)->bounds_change (self);
}
@ -993,5 +1044,8 @@ gtk_at_context_child_changed (GtkATContext *self,
GtkAccessibleChildChange change,
GtkAccessible *child)
{
if (!self->realized)
return;
GTK_AT_CONTEXT_GET_CLASS (self)->child_change (self, change, child);
}

9
gtk/gtkatcontextprivate.h
View File

@ -116,6 +116,8 @@ struct _GtkATContext
GtkAccessiblePropertyChange updated_properties;
GtkAccessibleRelationChange updated_relations;
GtkAccessiblePlatformChange updated_platform;
guint realized : 1;
};
struct _GtkATContextClass
@ -138,10 +140,17 @@ struct _GtkATContextClass
void (* child_change) (GtkATContext *self,
GtkAccessibleChildChange changed_child,
GtkAccessible *child);
void (* realize) (GtkATContext *self);
void (* unrealize) (GtkATContext *self);
};
GdkDisplay * gtk_at_context_get_display (GtkATContext *self);
void gtk_at_context_realize (GtkATContext *self);
void gtk_at_context_unrealize (GtkATContext *self);
gboolean gtk_at_context_is_realized (GtkATContext *self);
void gtk_at_context_update (GtkATContext *self);
void gtk_at_context_set_accessible_state (GtkATContext *self,

13
gtk/gtkwidget.c
View File

@ -2346,6 +2346,16 @@ gtk_widget_root (GtkWidget *widget)
if (priv->layout_manager)
gtk_layout_manager_set_root (priv->layout_manager, priv->root);
if (priv->at_context != NULL)
{
GtkATContext *root_context = gtk_accessible_get_at_context (GTK_ACCESSIBLE (priv->root));
if (root_context)
gtk_at_context_realize (root_context);
gtk_at_context_realize (priv->at_context);
}
GTK_WIDGET_GET_CLASS (widget)->root (widget);
if (!GTK_IS_ROOT (widget))
@ -2370,6 +2380,9 @@ gtk_widget_unroot (GtkWidget *widget)
GTK_WIDGET_GET_CLASS (widget)->unroot (widget);
if (priv->at_context)
gtk_at_context_unrealize (priv->at_context);
if (priv->context)
gtk_style_context_set_display (priv->context, gdk_display_get_default ());