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gtk2/gtk/gtkatcontext.c
Lukáš Tyrychtr 955d50a080 Fix generation of accessible description in presence of described by relations 
The loop going through the relation list should have stopped on the NULL sentinel value, however it never accesed the next list element.
2021-09-14 14:33:30 +02:00

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/* gtkatcontext.c: Assistive technology context
*
* Copyright 2020 GNOME Foundation
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/**
* GtkATContext:
*
* `GtkATContext` is an abstract class provided by GTK to communicate to
* platform-specific assistive technologies API.
*
* Each platform supported by GTK implements a `GtkATContext` subclass, and
* is responsible for updating the accessible state in response to state
* changes in `GtkAccessible`.
*/
#include "config.h"
#include "gtkatcontextprivate.h"
#include "gtkaccessiblevalueprivate.h"
#include "gtkaccessibleprivate.h"
#include "gtkdebug.h"
#include "gtktestatcontextprivate.h"
#include "gtktypebuiltins.h"
#if defined(GDK_WINDOWING_X11) || defined(GDK_WINDOWING_WAYLAND)
#include "a11y/gtkatspicontextprivate.h"
#endif
G_DEFINE_ABSTRACT_TYPE (GtkATContext, gtk_at_context, G_TYPE_OBJECT)
enum
{
PROP_ACCESSIBLE_ROLE = 1,
PROP_ACCESSIBLE,
PROP_DISPLAY,
N_PROPS
};
enum
{
STATE_CHANGE,
LAST_SIGNAL
};
static GParamSpec *obj_props[N_PROPS];
static guint obj_signals[LAST_SIGNAL];
static void
gtk_at_context_finalize (GObject *gobject)
{
GtkATContext *self = GTK_AT_CONTEXT (gobject);
gtk_accessible_attribute_set_unref (self->properties);
gtk_accessible_attribute_set_unref (self->relations);
gtk_accessible_attribute_set_unref (self->states);
G_OBJECT_CLASS (gtk_at_context_parent_class)->finalize (gobject);
}
static void
gtk_at_context_dispose (GObject *gobject)
{
GtkATContext *self = GTK_AT_CONTEXT (gobject);
gtk_at_context_unrealize (self);
G_OBJECT_CLASS (gtk_at_context_parent_class)->dispose (gobject);
}
static void
gtk_at_context_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkATContext *self = GTK_AT_CONTEXT (gobject);
switch (prop_id)
{
case PROP_ACCESSIBLE_ROLE:
if (!self->realized)
self->accessible_role = g_value_get_enum (value);
else
g_critical ("The accessible role cannot be set on a realized AT context");
break;
case PROP_ACCESSIBLE:
self->accessible = g_value_get_object (value);
break;
case PROP_DISPLAY:
gtk_at_context_set_display (self, g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
}
}
static void
gtk_at_context_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkATContext *self = GTK_AT_CONTEXT (gobject);
switch (prop_id)
{
case PROP_ACCESSIBLE_ROLE:
g_value_set_enum (value, self->accessible_role);
break;
case PROP_ACCESSIBLE:
g_value_set_object (value, self->accessible);
break;
case PROP_DISPLAY:
g_value_set_object (value, self->display);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
}
}
static void
gtk_at_context_real_state_change (GtkATContext *self,
GtkAccessibleStateChange changed_states,
GtkAccessiblePropertyChange changed_properties,
GtkAccessibleRelationChange changed_relations,
GtkAccessibleAttributeSet *states,
GtkAccessibleAttributeSet *properties,
GtkAccessibleAttributeSet *relations)
{
}
static void
gtk_at_context_real_platform_change (GtkATContext *self,
GtkAccessiblePlatformChange change)
{
}
static void
gtk_at_context_real_bounds_change (GtkATContext *self)
{
}
static void
gtk_at_context_real_child_change (GtkATContext *self,
GtkAccessibleChildChange change,
GtkAccessible *child)
{
}
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)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gtk_at_context_set_property;
gobject_class->get_property = gtk_at_context_get_property;
gobject_class->dispose = gtk_at_context_dispose;
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;
klass->child_change = gtk_at_context_real_child_change;
/**
* GtkATContext:accessible-role: (attributes org.gtk.Property.get=gtk_at_context_get_accessible_role)
*
* The accessible role used by the AT context.
*
* Depending on the given role, different states and properties can be
* set or retrieved.
*/
obj_props[PROP_ACCESSIBLE_ROLE] =
g_param_spec_enum ("accessible-role",
"Accessible Role",
"The accessible role of the AT context",
GTK_TYPE_ACCESSIBLE_ROLE,
GTK_ACCESSIBLE_ROLE_NONE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_STATIC_STRINGS);
/**
* GtkATContext:accessible: (attributes org.gtk.Property.get=gtk_at_context_get_accessible)
*
* The `GtkAccessible` that created the `GtkATContext` instance.
*/
obj_props[PROP_ACCESSIBLE] =
g_param_spec_object ("accessible",
"Accessible",
"The accessible implementation",
GTK_TYPE_ACCESSIBLE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS);
/**
* GtkATContext:display:
*
* The `GdkDisplay` for the `GtkATContext`.
*/
obj_props[PROP_DISPLAY] =
g_param_spec_object ("display",
"Display",
"The display connection",
GDK_TYPE_DISPLAY,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkATContext::state-change:
* @self: the `GtkATContext`
*
* Emitted when the attributes of the accessible for the
* `GtkATContext` instance change.
*/
obj_signals[STATE_CHANGE] =
g_signal_new ("state-change",
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_FIRST,
0,
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
g_object_class_install_properties (gobject_class, N_PROPS, obj_props);
}
#define N_PROPERTIES (GTK_ACCESSIBLE_PROPERTY_VALUE_TEXT + 1)
#define N_RELATIONS (GTK_ACCESSIBLE_RELATION_SET_SIZE + 1)
#define N_STATES (GTK_ACCESSIBLE_STATE_SELECTED + 1)
static const char *property_attrs[] = {
[GTK_ACCESSIBLE_PROPERTY_AUTOCOMPLETE] = "autocomplete",
[GTK_ACCESSIBLE_PROPERTY_DESCRIPTION] = "description",
[GTK_ACCESSIBLE_PROPERTY_HAS_POPUP] = "haspopup",
[GTK_ACCESSIBLE_PROPERTY_KEY_SHORTCUTS] = "keyshortcuts",
[GTK_ACCESSIBLE_PROPERTY_LABEL] = "label",
[GTK_ACCESSIBLE_PROPERTY_LEVEL] = "level",
[GTK_ACCESSIBLE_PROPERTY_MODAL] = "modal",
[GTK_ACCESSIBLE_PROPERTY_MULTI_LINE] = "multiline",
[GTK_ACCESSIBLE_PROPERTY_MULTI_SELECTABLE] = "multiselectable",
[GTK_ACCESSIBLE_PROPERTY_ORIENTATION] = "orientation",
[GTK_ACCESSIBLE_PROPERTY_PLACEHOLDER] = "placeholder",
[GTK_ACCESSIBLE_PROPERTY_READ_ONLY] = "readonly",
[GTK_ACCESSIBLE_PROPERTY_REQUIRED] = "required",
[GTK_ACCESSIBLE_PROPERTY_ROLE_DESCRIPTION] = "roledescription",
[GTK_ACCESSIBLE_PROPERTY_SORT] = "sort",
[GTK_ACCESSIBLE_PROPERTY_VALUE_MAX] = "valuemax",
[GTK_ACCESSIBLE_PROPERTY_VALUE_MIN] = "valuemin",
[GTK_ACCESSIBLE_PROPERTY_VALUE_NOW] = "valuenow",
[GTK_ACCESSIBLE_PROPERTY_VALUE_TEXT] = "valuetext",
};
/*< private >
* gtk_accessible_property_get_attribute_name:
* @property: a `GtkAccessibleProperty`
*
* Retrieves the name of a `GtkAccessibleProperty`.
*
* Returns: (transfer none): the name of the accessible property
*/
const char *
gtk_accessible_property_get_attribute_name (GtkAccessibleProperty property)
{
g_return_val_if_fail (property >= GTK_ACCESSIBLE_PROPERTY_AUTOCOMPLETE &&
property <= GTK_ACCESSIBLE_PROPERTY_VALUE_TEXT,
"<none>");
return property_attrs[property];
}
static const char *relation_attrs[] = {
[GTK_ACCESSIBLE_RELATION_ACTIVE_DESCENDANT] = "activedescendant",
[GTK_ACCESSIBLE_RELATION_COL_COUNT] = "colcount",
[GTK_ACCESSIBLE_RELATION_COL_INDEX] = "colindex",
[GTK_ACCESSIBLE_RELATION_COL_INDEX_TEXT] = "colindextext",
[GTK_ACCESSIBLE_RELATION_COL_SPAN] = "colspan",
[GTK_ACCESSIBLE_RELATION_CONTROLS] = "controls",
[GTK_ACCESSIBLE_RELATION_DESCRIBED_BY] = "describedby",
[GTK_ACCESSIBLE_RELATION_DETAILS] = "details",
[GTK_ACCESSIBLE_RELATION_ERROR_MESSAGE] = "errormessage",
[GTK_ACCESSIBLE_RELATION_FLOW_TO] = "flowto",
[GTK_ACCESSIBLE_RELATION_LABELLED_BY] = "labelledby",
[GTK_ACCESSIBLE_RELATION_OWNS] = "owns",
[GTK_ACCESSIBLE_RELATION_POS_IN_SET] = "posinset",
[GTK_ACCESSIBLE_RELATION_ROW_COUNT] = "rowcount",
[GTK_ACCESSIBLE_RELATION_ROW_INDEX] = "rowindex",
[GTK_ACCESSIBLE_RELATION_ROW_INDEX_TEXT] = "rowindextext",
[GTK_ACCESSIBLE_RELATION_ROW_SPAN] = "rowspan",
[GTK_ACCESSIBLE_RELATION_SET_SIZE] = "setsize",
};
/*< private >
* gtk_accessible_relation_get_attribute_name:
* @relation: a `GtkAccessibleRelation`
*
* Retrieves the name of a `GtkAccessibleRelation`.
*
* Returns: (transfer none): the name of the accessible relation
*/
const char *
gtk_accessible_relation_get_attribute_name (GtkAccessibleRelation relation)
{
g_return_val_if_fail (relation >= GTK_ACCESSIBLE_RELATION_ACTIVE_DESCENDANT &&
relation <= GTK_ACCESSIBLE_RELATION_SET_SIZE,
"<none>");
return relation_attrs[relation];
}
static const char *state_attrs[] = {
[GTK_ACCESSIBLE_STATE_BUSY] = "busy",
[GTK_ACCESSIBLE_STATE_CHECKED] = "checked",
[GTK_ACCESSIBLE_STATE_DISABLED] = "disabled",
[GTK_ACCESSIBLE_STATE_EXPANDED] = "expanded",
[GTK_ACCESSIBLE_STATE_HIDDEN] = "hidden",
[GTK_ACCESSIBLE_STATE_INVALID] = "invalid",
[GTK_ACCESSIBLE_STATE_PRESSED] = "pressed",
[GTK_ACCESSIBLE_STATE_SELECTED] = "selected",
};
/*< private >
* gtk_accessible_state_get_attribute_name:
* @state: a `GtkAccessibleState`
*
* Retrieves the name of a `GtkAccessibleState`.
*
* Returns: (transfer none): the name of the accessible state
*/
const char *
gtk_accessible_state_get_attribute_name (GtkAccessibleState state)
{
g_return_val_if_fail (state >= GTK_ACCESSIBLE_STATE_BUSY &&
state <= GTK_ACCESSIBLE_STATE_SELECTED,
"<none>");
return state_attrs[state];
}
static void
gtk_at_context_init (GtkATContext *self)
{
self->accessible_role = GTK_ACCESSIBLE_ROLE_NONE;
self->properties =
gtk_accessible_attribute_set_new (G_N_ELEMENTS (property_attrs),
(GtkAccessibleAttributeNameFunc) gtk_accessible_property_get_attribute_name,
(GtkAccessibleAttributeDefaultFunc) gtk_accessible_value_get_default_for_property);
self->relations =
gtk_accessible_attribute_set_new (G_N_ELEMENTS (relation_attrs),
(GtkAccessibleAttributeNameFunc) gtk_accessible_relation_get_attribute_name,
(GtkAccessibleAttributeDefaultFunc) gtk_accessible_value_get_default_for_relation);
self->states =
gtk_accessible_attribute_set_new (G_N_ELEMENTS (state_attrs),
(GtkAccessibleAttributeNameFunc) gtk_accessible_state_get_attribute_name,
(GtkAccessibleAttributeDefaultFunc) gtk_accessible_value_get_default_for_state);
}
/**
* gtk_at_context_get_accessible: (attributes org.gtk.Method.get_property=accessible)
* @self: a `GtkATContext`
*
* Retrieves the `GtkAccessible` using this context.
*
* Returns: (transfer none): a `GtkAccessible`
*/
GtkAccessible *
gtk_at_context_get_accessible (GtkATContext *self)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
return self->accessible;
}
/*< private >
* gtk_at_context_set_accessible_role:
* @self: a `GtkATContext`
* @role: the accessible role for the context
*
* Sets the accessible role for the given `GtkATContext`.
*
* This function can only be called if the `GtkATContext` is unrealized.
*/
void
gtk_at_context_set_accessible_role (GtkATContext *self,
GtkAccessibleRole role)
{
g_return_if_fail (GTK_IS_AT_CONTEXT (self));
g_return_if_fail (!self->realized);
if (self->accessible_role == role)
return;
self->accessible_role = role;
g_object_notify_by_pspec (G_OBJECT (self), obj_props[PROP_ACCESSIBLE_ROLE]);
}
/**
* gtk_at_context_get_accessible_role: (attributes org.gtk.Method.get_property=accessible-role)
* @self: a `GtkATContext`
*
* Retrieves the accessible role of this context.
*
* Returns: a `GtkAccessibleRole`
*/
GtkAccessibleRole
gtk_at_context_get_accessible_role (GtkATContext *self)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), GTK_ACCESSIBLE_ROLE_NONE);
return self->accessible_role;
}
/*< private >
* gtk_at_context_set_display:
* @self: a `GtkATContext`
* @display: a `GdkDisplay`
*
* Sets the `GdkDisplay` used by the `GtkATContext`.
*
* This function can only be called if the `GtkATContext` is
* not realized.
*/
void
gtk_at_context_set_display (GtkATContext *self,
GdkDisplay *display)
{
g_return_if_fail (GTK_IS_AT_CONTEXT (self));
g_return_if_fail (display == NULL || GDK_IS_DISPLAY (display));
if (self->display == display)
return;
if (self->realized)
return;
self->display = display;
g_object_notify_by_pspec (G_OBJECT (self), obj_props[PROP_DISPLAY]);
}
/*< private >
* gtk_at_context_get_display:
* @self: a `GtkATContext`
*
* Retrieves the `GdkDisplay` used to create the context.
*
* Returns: (transfer none): a `GdkDisplay`
*/
GdkDisplay *
gtk_at_context_get_display (GtkATContext *self)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
return self->display;
}
static const struct {
const char *name;
const char *env_name;
GtkATContext * (* create_context) (GtkAccessibleRole accessible_role,
GtkAccessible *accessible,
GdkDisplay *display);
} a11y_backends[] = {
#if defined(GDK_WINDOWING_WAYLAND)
{ "AT-SPI (Wayland)", "atspi", gtk_at_spi_create_context },
#endif
#if defined(GDK_WINDOWING_X11)
{ "AT-SPI (X11)", "atspi", gtk_at_spi_create_context },
#endif
{ "Test", "test", gtk_test_at_context_new },
{ NULL, NULL, NULL },
};
/**
* gtk_at_context_create: (constructor)
* @accessible_role: the accessible role used by the `GtkATContext`
* @accessible: the `GtkAccessible` implementation using the `GtkATContext`
* @display: the `GdkDisplay` used by the `GtkATContext`
*
* Creates a new `GtkATContext` instance for the given accessible role,
* accessible instance, and display connection.
*
* The `GtkATContext` implementation being instantiated will depend on the
* platform.
*
* Returns: (nullable) (transfer full): the `GtkATContext`
*/
GtkATContext *
gtk_at_context_create (GtkAccessibleRole accessible_role,
GtkAccessible *accessible,
GdkDisplay *display)
{
static const char *gtk_a11y_env;
if (gtk_a11y_env == NULL)
{
gtk_a11y_env = g_getenv ("GTK_A11Y");
if (gtk_a11y_env == NULL)
gtk_a11y_env = "0";
if (g_ascii_strcasecmp (gtk_a11y_env, "help") == 0)
{
g_print ("Supported arguments for GTK_A11Y environment variable:\n");
#if defined(GDK_WINDOWING_X11) || defined(GDK_WINDOWING_WAYLAND)
g_print (" atspi - Use the AT-SPI accessibility backend\n");
#endif
g_print (" test - Use the test accessibility backend\n");
g_print (" none - Disable the accessibility backend\n");
g_print (" help - Print this help\n\n");
g_print ("Other arguments will cause a warning and be ignored.\n");
gtk_a11y_env = "0";
}
}
/* Short-circuit disabling the accessibility support */
if (g_ascii_strcasecmp (gtk_a11y_env, "none") == 0)
return NULL;
GtkATContext *res = NULL;
for (guint i = 0; i < G_N_ELEMENTS (a11y_backends); i++)
{
if (a11y_backends[i].name == NULL)
break;
if (a11y_backends[i].create_context != NULL &&
(*gtk_a11y_env == '0' || g_ascii_strcasecmp (a11y_backends[i].env_name, gtk_a11y_env) == 0))
{
res = a11y_backends[i].create_context (accessible_role, accessible, display);
if (res != NULL)
break;
}
}
if (*gtk_a11y_env != '0' && res == NULL)
g_warning ("Unrecognized accessibility backend \"%s\". Try GTK_A11Y=help", gtk_a11y_env);
/* Fall back to the test context, so we can get debugging data */
if (res == NULL)
res = g_object_new (GTK_TYPE_TEST_AT_CONTEXT,
"accessible_role", accessible_role,
"accessible", accessible,
"display", display,
NULL);
return res;
}
/*< private >
* gtk_at_context_clone: (constructor)
* @self: the `GtkATContext` to clone
* @role: the accessible role of the clone, or %GTK_ACCESSIBLE_ROLE_NONE to
* use the same accessible role of @self
* @accessible: (nullable): the accessible creating the context, or %NULL to
* use the same `GtkAccessible` of @self
* @display: (nullable): the display connection, or %NULL to use the same
* `GdkDisplay` of @self
*
* Clones the state of the given `GtkATContext`, using @role, @accessible,
* and @display.
*
* If @self is realized, the returned `GtkATContext` will also be realized.
*
* Returns: (transfer full): the newly created `GtkATContext`
*/
GtkATContext *
gtk_at_context_clone (GtkATContext *self,
GtkAccessibleRole role,
GtkAccessible *accessible,
GdkDisplay *display)
{
g_return_val_if_fail (self == NULL || GTK_IS_AT_CONTEXT (self), NULL);
g_return_val_if_fail (accessible == NULL || GTK_IS_ACCESSIBLE (accessible), NULL);
g_return_val_if_fail (display == NULL || GDK_IS_DISPLAY (display), NULL);
if (self != NULL && role == GTK_ACCESSIBLE_ROLE_NONE)
role = self->accessible_role;
if (self != NULL && accessible == NULL)
accessible = self->accessible;
if (self != NULL && display == NULL)
display = self->display;
GtkATContext *res = gtk_at_context_create (role, accessible, display);
if (self != NULL)
{
g_clear_pointer (&res->states, gtk_accessible_attribute_set_unref);
g_clear_pointer (&res->properties, gtk_accessible_attribute_set_unref);
g_clear_pointer (&res->relations, gtk_accessible_attribute_set_unref);
res->states = gtk_accessible_attribute_set_ref (self->states);
res->properties = gtk_accessible_attribute_set_ref (self->properties);
res->relations = gtk_accessible_attribute_set_ref (self->relations);
if (self->realized)
gtk_at_context_realize (res);
}
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`
*
* Notifies the AT connected to this `GtkATContext` that the accessible
* state and its properties have changed.
*/
void
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 &&
self->updated_states == 0)
return;
GTK_AT_CONTEXT_GET_CLASS (self)->state_change (self,
self->updated_states, self->updated_properties, self->updated_relations,
self->states, self->properties, self->relations);
g_signal_emit (self, obj_signals[STATE_CHANGE], 0);
self->updated_properties = 0;
self->updated_relations = 0;
self->updated_states = 0;
}
/*< private >
* gtk_at_context_set_accessible_state:
* @self: a `GtkATContext`
* @state: a `GtkAccessibleState`
* @value: (nullable): `GtkAccessibleValue`
*
* Sets the @value for the given @state of a `GtkATContext`.
*
* If @value is %NULL, the state is unset.
*
* This function will accumulate state changes until gtk_at_context_update()
* is called.
*/
void
gtk_at_context_set_accessible_state (GtkATContext *self,
GtkAccessibleState state,
GtkAccessibleValue *value)
{
g_return_if_fail (GTK_IS_AT_CONTEXT (self));
gboolean res = FALSE;
if (value != NULL)
res = gtk_accessible_attribute_set_add (self->states, state, value);
else
res = gtk_accessible_attribute_set_remove (self->states, state);
if (res)
self->updated_states |= (1 << state);
}
/*< private >
* gtk_at_context_has_accessible_state:
* @self: a `GtkATContext`
* @state: a `GtkAccessibleState`
*
* Checks whether a `GtkATContext` has the given @state set.
*
* Returns: %TRUE, if the accessible state is set
*/
gboolean
gtk_at_context_has_accessible_state (GtkATContext *self,
GtkAccessibleState state)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), FALSE);
return gtk_accessible_attribute_set_contains (self->states, state);
}
/*< private >
* gtk_at_context_get_accessible_state:
* @self: a `GtkATContext`
* @state: a `GtkAccessibleState`
*
* Retrieves the value for the accessible state of a `GtkATContext`.
*
* Returns: (transfer none): the value for the given state
*/
GtkAccessibleValue *
gtk_at_context_get_accessible_state (GtkATContext *self,
GtkAccessibleState state)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
return gtk_accessible_attribute_set_get_value (self->states, state);
}
/*< private >
* gtk_at_context_set_accessible_property:
* @self: a `GtkATContext`
* @property: a `GtkAccessibleProperty`
* @value: (nullable): `GtkAccessibleValue`
*
* Sets the @value for the given @property of a `GtkATContext`.
*
* If @value is %NULL, the property is unset.
*
* This function will accumulate property changes until gtk_at_context_update()
* is called.
*/
void
gtk_at_context_set_accessible_property (GtkATContext *self,
GtkAccessibleProperty property,
GtkAccessibleValue *value)
{
g_return_if_fail (GTK_IS_AT_CONTEXT (self));
gboolean res = FALSE;
if (value != NULL)
res = gtk_accessible_attribute_set_add (self->properties, property, value);
else
res = gtk_accessible_attribute_set_remove (self->properties, property);
if (res)
self->updated_properties |= (1 << property);
}
/*< private >
* gtk_at_context_has_accessible_property:
* @self: a `GtkATContext`
* @property: a `GtkAccessibleProperty`
*
* Checks whether a `GtkATContext` has the given @property set.
*
* Returns: %TRUE, if the accessible property is set
*/
gboolean
gtk_at_context_has_accessible_property (GtkATContext *self,
GtkAccessibleProperty property)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), FALSE);
return gtk_accessible_attribute_set_contains (self->properties, property);
}
/*< private >
* gtk_at_context_get_accessible_property:
* @self: a `GtkATContext`
* @property: a `GtkAccessibleProperty`
*
* Retrieves the value for the accessible property of a `GtkATContext`.
*
* Returns: (transfer none): the value for the given property
*/
GtkAccessibleValue *
gtk_at_context_get_accessible_property (GtkATContext *self,
GtkAccessibleProperty property)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
return gtk_accessible_attribute_set_get_value (self->properties, property);
}
/*< private >
* gtk_at_context_set_accessible_relation:
* @self: a `GtkATContext`
* @relation: a `GtkAccessibleRelation`
* @value: (nullable): `GtkAccessibleValue`
*
* Sets the @value for the given @relation of a `GtkATContext`.
*
* If @value is %NULL, the relation is unset.
*
* This function will accumulate relation changes until gtk_at_context_update()
* is called.
*/
void
gtk_at_context_set_accessible_relation (GtkATContext *self,
GtkAccessibleRelation relation,
GtkAccessibleValue *value)
{
g_return_if_fail (GTK_IS_AT_CONTEXT (self));
gboolean res = FALSE;
if (value != NULL)
res = gtk_accessible_attribute_set_add (self->relations, relation, value);
else
res = gtk_accessible_attribute_set_remove (self->relations, relation);
if (res)
self->updated_relations |= (1 << relation);
}
/*< private >
* gtk_at_context_has_accessible_relation:
* @self: a `GtkATContext`
* @relation: a `GtkAccessibleRelation`
*
* Checks whether a `GtkATContext` has the given @relation set.
*
* Returns: %TRUE, if the accessible relation is set
*/
gboolean
gtk_at_context_has_accessible_relation (GtkATContext *self,
GtkAccessibleRelation relation)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), FALSE);
return gtk_accessible_attribute_set_contains (self->relations, relation);
}
/*< private >
* gtk_at_context_get_accessible_relation:
* @self: a `GtkATContext`
* @relation: a `GtkAccessibleRelation`
*
* Retrieves the value for the accessible relation of a `GtkATContext`.
*
* Returns: (transfer none): the value for the given relation
*/
GtkAccessibleValue *
gtk_at_context_get_accessible_relation (GtkATContext *self,
GtkAccessibleRelation relation)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
return gtk_accessible_attribute_set_get_value (self->relations, relation);
}
static gboolean
is_structural_role (GtkAccessibleRole role)
{
/* Keep the switch small while avoiding the compiler warning for
* unhandled enumeration values
*/
switch ((int) role)
{
case GTK_ACCESSIBLE_ROLE_FORM:
case GTK_ACCESSIBLE_ROLE_GROUP:
case GTK_ACCESSIBLE_ROLE_GENERIC:
case GTK_ACCESSIBLE_ROLE_LANDMARK:
case GTK_ACCESSIBLE_ROLE_LIST_ITEM:
case GTK_ACCESSIBLE_ROLE_REGION:
case GTK_ACCESSIBLE_ROLE_SEARCH:
case GTK_ACCESSIBLE_ROLE_SEPARATOR:
return TRUE;
default:
break;
}
return FALSE;
}
/* See the WAI-ARIA § 4.3, "Accessible Name and Description Computation" */
static void
gtk_at_context_get_name_accumulate (GtkATContext *self,
GPtrArray *names,
gboolean recurse)
{
GtkAccessibleValue *value = NULL;
if (gtk_accessible_attribute_set_contains (self->properties, GTK_ACCESSIBLE_PROPERTY_LABEL))
{
value = gtk_accessible_attribute_set_get_value (self->properties, GTK_ACCESSIBLE_PROPERTY_LABEL);
g_ptr_array_add (names, (char *) gtk_string_accessible_value_get (value));
}
if (recurse && gtk_accessible_attribute_set_contains (self->relations, GTK_ACCESSIBLE_RELATION_LABELLED_BY))
{
value = gtk_accessible_attribute_set_get_value (self->relations, GTK_ACCESSIBLE_RELATION_LABELLED_BY);
GList *list = gtk_reference_list_accessible_value_get (value);
for (GList *l = list; l != NULL; l = l->next)
{
GtkAccessible *rel = GTK_ACCESSIBLE (l->data);
GtkATContext *rel_context = gtk_accessible_get_at_context (rel);
gtk_at_context_get_name_accumulate (rel_context, names, FALSE);
}
}
GtkAccessibleRole role = gtk_at_context_get_accessible_role (self);
switch ((int) role)
{
case GTK_ACCESSIBLE_ROLE_RANGE:
{
int range_attrs[] = {
GTK_ACCESSIBLE_PROPERTY_VALUE_TEXT,
GTK_ACCESSIBLE_PROPERTY_VALUE_NOW,
};
value = NULL;
for (int i = 0; i < G_N_ELEMENTS (range_attrs); i++)
{
if (gtk_accessible_attribute_set_contains (self->properties, range_attrs[i]))
{
value = gtk_accessible_attribute_set_get_value (self->properties, range_attrs[i]);
break;
}
}
if (value != NULL)
g_ptr_array_add (names, (char *) gtk_string_accessible_value_get (value));
}
break;
default:
break;
}
/* If there is no label or labelled-by attribute, hidden elements
* have no name
*/
if (gtk_accessible_attribute_set_contains (self->states, GTK_ACCESSIBLE_STATE_HIDDEN))
{
value = gtk_accessible_attribute_set_get_value (self->states, GTK_ACCESSIBLE_STATE_HIDDEN);
if (gtk_boolean_accessible_value_get (value))
return;
}
/* This fallback is in place only for unlabelled elements */
if (names->len != 0)
return;
/* Ignore structural elements, namely: generic containers */
if (self->accessible != NULL && !is_structural_role (role))
g_ptr_array_add (names, (char *)G_OBJECT_TYPE_NAME (self->accessible));
}
static void
gtk_at_context_get_description_accumulate (GtkATContext *self,
GPtrArray *labels,
gboolean recurse)
{
GtkAccessibleValue *value = NULL;
if (gtk_accessible_attribute_set_contains (self->properties, GTK_ACCESSIBLE_PROPERTY_DESCRIPTION))
{
value = gtk_accessible_attribute_set_get_value (self->properties, GTK_ACCESSIBLE_PROPERTY_DESCRIPTION);
g_ptr_array_add (labels, (char *) gtk_string_accessible_value_get (value));
}
if (recurse && gtk_accessible_attribute_set_contains (self->relations, GTK_ACCESSIBLE_RELATION_DESCRIBED_BY))
{
value = gtk_accessible_attribute_set_get_value (self->relations, GTK_ACCESSIBLE_RELATION_DESCRIBED_BY);
GList *list = gtk_reference_list_accessible_value_get (value);
for (GList *l = list; l != NULL; l = l->next)
{
GtkAccessible *rel = GTK_ACCESSIBLE (l->data);
GtkATContext *rel_context = gtk_accessible_get_at_context (rel);
gtk_at_context_get_description_accumulate (rel_context, labels, FALSE);
}
}
GtkAccessibleRole role = gtk_at_context_get_accessible_role (self);
switch ((int) role)
{
case GTK_ACCESSIBLE_ROLE_RANGE:
{
int range_attrs[] = {
GTK_ACCESSIBLE_PROPERTY_VALUE_TEXT,
GTK_ACCESSIBLE_PROPERTY_VALUE_NOW,
};
value = NULL;
for (int i = 0; i < G_N_ELEMENTS (range_attrs); i++)
{
if (gtk_accessible_attribute_set_contains (self->properties, range_attrs[i]))
{
value = gtk_accessible_attribute_set_get_value (self->properties, range_attrs[i]);
break;
}
}
if (value != NULL)
g_ptr_array_add (labels, (char *) gtk_string_accessible_value_get (value));
}
break;
default:
break;
}
/* If there is no description or described-by attribute, hidden elements
* have no description
*/
if (gtk_accessible_attribute_set_contains (self->states, GTK_ACCESSIBLE_STATE_HIDDEN))
{
value = gtk_accessible_attribute_set_get_value (self->states, GTK_ACCESSIBLE_STATE_HIDDEN);
if (gtk_boolean_accessible_value_get (value))
return;
}
}
/*< private >
* gtk_at_context_get_name:
* @self: a `GtkATContext`
*
* Retrieves the accessible name of the `GtkATContext`.
*
* This is a convenience function meant to be used by `GtkATContext` implementations.
*
* Returns: (transfer full): the label of the `GtkATContext`
*/
char *
gtk_at_context_get_name (GtkATContext *self)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
GPtrArray *names = g_ptr_array_new ();
gtk_at_context_get_name_accumulate (self, names, TRUE);
if (names->len == 0)
{
g_ptr_array_unref (names);
return g_strdup ("");
}
GString *res = g_string_new ("");
g_string_append (res, g_ptr_array_index (names, 0));
for (guint i = 1; i < names->len; i++)
{
g_string_append (res, " ");
g_string_append (res, g_ptr_array_index (names, i));
}
g_ptr_array_unref (names);
return g_string_free (res, FALSE);
}
/*< private >
* gtk_at_context_get_description:
* @self: a `GtkATContext`
*
* Retrieves the accessible description of the `GtkATContext`.
*
* This is a convenience function meant to be used by `GtkATContext` implementations.
*
* Returns: (transfer full): the label of the `GtkATContext`
*/
char *
gtk_at_context_get_description (GtkATContext *self)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
GPtrArray *names = g_ptr_array_new ();
gtk_at_context_get_description_accumulate (self, names, TRUE);
if (names->len == 0)
{
g_ptr_array_unref (names);
return g_strdup ("");
}
GString *res = g_string_new ("");
g_string_append (res, g_ptr_array_index (names, 0));
for (guint i = 1; i < names->len; i++)
{
g_string_append (res, " ");
g_string_append (res, g_ptr_array_index (names, i));
}
g_ptr_array_unref (names);
return g_string_free (res, FALSE);
}
void
gtk_at_context_platform_changed (GtkATContext *self,
GtkAccessiblePlatformChange change)
{
gtk_at_context_realize (self);
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);
}
void
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);
}
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