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gtk2/gtk/gtkatcontext.c
Emmanuele Bassi 7ed06480cf a11y: Add private API to clone a GtkATContext 
Some widgets might want to override GtkAccessible and create their own
context in order to control the accessible role post-construction time.
To avoid explicitly copying the existing state over from the original
ATContext to the new one, we need a way to clone the context's state
from inside the ATContext itself.
2020-11-10 14:31:56 +00:00

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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/>.
*/
/**
* SECTION:gtkatcontext
* @Title: GtkATContext
* @Short_description: An object communicating to Assistive Technologies
*
* 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:
self->display = 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:
*
* 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:
*
* 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_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS);
/**
* 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 (N_PROPERTIES,
property_attrs,
(GtkAccessibleAttributeDefaultFunc) gtk_accessible_value_get_default_for_property);
self->relations =
gtk_accessible_attribute_set_new (N_RELATIONS,
relation_attrs,
(GtkAccessibleAttributeDefaultFunc) gtk_accessible_value_get_default_for_relation);
self->states =
gtk_accessible_attribute_set_new (N_STATES,
state_attrs,
(GtkAccessibleAttributeDefaultFunc) gtk_accessible_value_get_default_for_state);
}
/**
* gtk_at_context_get_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;
}
/**
* gtk_at_context_get_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_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";
}
/* Short-circuit disabling the accessibility support */
if (g_ascii_strcasecmp (gtk_a11y_env, "none") == 0)
return NULL;
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");
}
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;
GtkAccessibleStateChange changed_states =
gtk_accessible_attribute_set_get_changed (self->states);
GtkAccessiblePropertyChange changed_properties =
gtk_accessible_attribute_set_get_changed (self->properties);
GtkAccessibleRelationChange changed_relations =
gtk_accessible_attribute_set_get_changed (self->relations);
GTK_AT_CONTEXT_GET_CLASS (self)->state_change (self,
changed_states, changed_properties, changed_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);
}
/* 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;
if (self->accessible)
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->data)
{
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)
{
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);
}
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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