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Learning_GTK4_tree/gtk/gtkatcontext.c

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2023-12-12 11:36:42 +01:00
/* 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 "gtkprivate.h"
#include "gtktestatcontextprivate.h"
#include "gtktypebuiltins.h"
#include "gtkbutton.h"
#include "gtktogglebutton.h"
#include "gtkmenubutton.h"
#include "gtkdropdown.h"
#include "gtkcolordialogbutton.h"
#include "gtkfontdialogbutton.h"
#include "gtkscalebutton.h"
#include "print/gtkprinteroptionwidgetprivate.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);
if (self->accessible_parent != NULL)
{
g_object_remove_weak_pointer (G_OBJECT (self->accessible_parent),
(gpointer *) &self->accessible_parent);
self->accessible_parent = NULL;
}
if (self->next_accessible_sibling != NULL)
{
g_object_remove_weak_pointer (G_OBJECT (self->next_accessible_sibling),
(gpointer *) &self->next_accessible_sibling);
self->next_accessible_sibling = NULL;
}
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:
gtk_at_context_set_accessible_role (self, g_value_get_enum (value));
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", NULL, NULL,
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", NULL, NULL,
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", NULL, NULL,
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",
[GTK_ACCESSIBLE_STATE_VISITED] = "visited",
};
/*< 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_get_accessible_parent:
* @self: a `GtkAtContext`
*
* Retrieves the parent accessible object of the given `GtkAtContext`.
*
* Returns: (nullable) (transfer none): the parent accessible object, or `NULL` if not set.
*/
GtkAccessible *
gtk_at_context_get_accessible_parent (GtkATContext *self)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
return self->accessible_parent;
}
/*< private >
* gtk_at_context_set_accessible_parent:
* @self: a `GtkAtContext`
* @parent: (nullable): the parent `GtkAccessible` to set
*
* Sets the parent accessible object of the given `GtkAtContext`.
*/
void
gtk_at_context_set_accessible_parent (GtkATContext *self,
GtkAccessible *parent)
{
g_return_if_fail (GTK_IS_AT_CONTEXT (self));
if (self->accessible_parent != parent)
{
if (self->accessible_parent != NULL)
g_object_remove_weak_pointer (G_OBJECT (self->accessible_parent),
(gpointer *) &self->accessible_parent);
self->accessible_parent = parent;
if (self->accessible_parent != NULL)
g_object_add_weak_pointer (G_OBJECT (self->accessible_parent),
(gpointer *) &self->accessible_parent);
}
}
/*< private >
* gtk_at_context_get_next_accessible_sibling:
* @self: a `GtkAtContext`
*
* Retrieves the next accessible sibling of the given `GtkAtContext`.
*
* Returns: (nullable) (transfer none): the next accessible sibling.
*/
GtkAccessible *
gtk_at_context_get_next_accessible_sibling (GtkATContext *self)
{
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
return self->next_accessible_sibling;
}
/*< private >
* gtk_at_context_set_next_accessible_sibling:
* @self: a `GtkAtContext`
* @sibling: (nullable): the next accessible sibling
*
* Sets the next accessible sibling object of the given `GtkAtContext`.
*/
void
gtk_at_context_set_next_accessible_sibling (GtkATContext *self,
GtkAccessible *sibling)
{
g_return_if_fail (GTK_IS_AT_CONTEXT (self));
if (self->next_accessible_sibling != sibling)
{
if (self->next_accessible_sibling != NULL)
g_object_remove_weak_pointer (G_OBJECT (self->next_accessible_sibling),
(gpointer *) &self->next_accessible_sibling);
self->next_accessible_sibling = sibling;
if (self->next_accessible_sibling != NULL)
g_object_add_weak_pointer (G_OBJECT (self->next_accessible_sibling),
(gpointer *) &self->next_accessible_sibling);
}
}
/*< 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_DEBUG (A11Y, "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_DEBUG (A11Y, "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);
}
/* See ARIA 5.2.8.4, 5.2.8.5 and 5.2.8.6 for the prohibited, from author
* and from content parts, and the table in
* https://www.w3.org/WAI/ARIA/apg/practices/names-and-descriptions/
* for the recommended / not recommended parts. We've made a few changes
* to the recommendations:
* - We don't recommend against labelling listitems, sincd GtkListView
* will put the focus on listitems sometimes.
* - We don't recommend tab lists being labelled, since GtkNotebook does
* not have a practical way of doing that.
*/
#define NAME_FROM_AUTHOR (1 << 6)
#define NAME_FROM_CONTENT (1 << 7)
static guint8 naming[] = {
[GTK_ACCESSIBLE_ROLE_ALERT] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_ALERT_DIALOG] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_BANNER] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_BLOCK_QUOTE] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_BUTTON] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_CAPTION] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_CELL] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT,
[GTK_ACCESSIBLE_ROLE_CHECKBOX] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_COLUMN_HEADER] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_COMBO_BOX] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_COMMAND] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_COMPOSITE] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_DIALOG] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_DOCUMENT] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_FEED] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_RECOMMENDED,
[GTK_ACCESSIBLE_ROLE_FORM] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_GENERIC] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_GRID] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_GRID_CELL] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT,
[GTK_ACCESSIBLE_ROLE_GROUP] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_HEADING] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_IMG] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_INPUT] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_LABEL] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT,
[GTK_ACCESSIBLE_ROLE_LANDMARK] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_LEGEND] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_LINK] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_LIST] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_LIST_BOX] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_LIST_ITEM] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_LOG] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_MAIN] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_MARQUEE] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_MATH] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_RECOMMENDED,
[GTK_ACCESSIBLE_ROLE_METER] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_MENU] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_RECOMMENDED,
[GTK_ACCESSIBLE_ROLE_MENU_BAR] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_RECOMMENDED,
[GTK_ACCESSIBLE_ROLE_MENU_ITEM] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_MENU_ITEM_CHECKBOX] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_MENU_ITEM_RADIO] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_NAVIGATION] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_RECOMMENDED,
[GTK_ACCESSIBLE_ROLE_NONE] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_NOTE] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_OPTION] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_PRESENTATION] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_PROGRESS_BAR] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_RADIO] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_RADIO_GROUP] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_RANGE] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_REGION] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_ROW] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT,
[GTK_ACCESSIBLE_ROLE_ROW_GROUP] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_NOT_RECOMMENDED,
[GTK_ACCESSIBLE_ROLE_ROW_HEADER] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_SCROLLBAR] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_SEARCH] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_RECOMMENDED,
[GTK_ACCESSIBLE_ROLE_SEARCH_BOX] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_SECTION] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_SECTION_HEAD] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_SELECT] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_SEPARATOR] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_SLIDER] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_SPIN_BUTTON] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_STATUS] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_STRUCTURE] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_SWITCH] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_TAB] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_TABLE] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_TAB_LIST] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_TAB_PANEL] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_TEXT_BOX] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_TIME] = GTK_ACCESSIBLE_NAME_PROHIBITED,
[GTK_ACCESSIBLE_ROLE_TIMER] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_TOOLBAR] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_RECOMMENDED,
[GTK_ACCESSIBLE_ROLE_TOOLTIP] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT,
[GTK_ACCESSIBLE_ROLE_TREE] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_TREE_GRID] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_TREE_ITEM] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_WIDGET] = NAME_FROM_AUTHOR|NAME_FROM_CONTENT,
[GTK_ACCESSIBLE_ROLE_WINDOW] = NAME_FROM_AUTHOR,
[GTK_ACCESSIBLE_ROLE_TOGGLE_BUTTON] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_APPLICATION] = NAME_FROM_AUTHOR|GTK_ACCESSIBLE_NAME_REQUIRED,
[GTK_ACCESSIBLE_ROLE_PARAGRAPH] = GTK_ACCESSIBLE_NAME_PROHIBITED,
};
/* < private >
* gtk_accessible_role_supports_name_from_author:
* @role: a `GtkAccessibleRole`
*
* Returns whether this role supports setting the label and description
* properties or the labelled-by and described-by relations.
*
* Returns: %TRUE if the role allows labelling
*/
gboolean
gtk_accessible_role_supports_name_from_author (GtkAccessibleRole role)
{
return (naming[role] & NAME_FROM_AUTHOR) != 0;
}
/* < private >
* gtk_accessible_role_supports_name_from_content:
* @role: a `GtkAccessibleRole`
*
* Returns whether this role will use content of child widgets such
* as labels for its accessible name and description if no explicit
* labels are provided.
*
* Returns: %TRUE if the role content naming
*/
gboolean
gtk_accessible_role_supports_name_from_content (GtkAccessibleRole role)
{
return (naming[role] & NAME_FROM_CONTENT) != 0;
}
/* < private >
* gtk_accessible_role_get_nameing:
* @role: a `GtkAccessibleRole`
*
* Returns naming information for this role.
*
* Returns: information about naming requirements for the role
*/
GtkAccessibleNaming
gtk_accessible_role_get_naming (GtkAccessibleRole role)
{
return (GtkAccessibleNaming) (naming[role] & ~(NAME_FROM_AUTHOR|NAME_FROM_CONTENT));
}
static gboolean
is_nested_button (GtkATContext *self)
{
GtkAccessible *accessible;
GtkWidget *widget, *parent;
accessible = gtk_at_context_get_accessible (self);
if (!GTK_IS_WIDGET (accessible))
return FALSE;
widget = GTK_WIDGET (accessible);
parent = gtk_widget_get_parent (widget);
if ((GTK_IS_TOGGLE_BUTTON (widget) && GTK_IS_DROP_DOWN (parent)) ||
(GTK_IS_TOGGLE_BUTTON (widget) && GTK_IS_MENU_BUTTON (parent)) ||
(GTK_IS_BUTTON (widget) && GTK_IS_COLOR_DIALOG_BUTTON (parent)) ||
(GTK_IS_BUTTON (widget) && GTK_IS_FONT_DIALOG_BUTTON (parent)) ||
(GTK_IS_BUTTON (widget) && GTK_IS_SCALE_BUTTON (parent))
#ifdef G_OS_UNIX
|| (GTK_IS_PRINTER_OPTION_WIDGET (parent) &&
(GTK_IS_CHECK_BUTTON (widget) ||
GTK_IS_DROP_DOWN (widget) ||
GTK_IS_ENTRY (widget) ||
GTK_IS_IMAGE (widget) ||
GTK_IS_LABEL (widget) ||
GTK_IS_BUTTON (widget)))
#endif
)
return TRUE;
return FALSE;
}
static GtkATContext *
get_parent_context (GtkATContext *self)
{
GtkAccessible *accessible, *parent;
accessible = gtk_at_context_get_accessible (self);
parent = gtk_accessible_get_accessible_parent (accessible);
if (parent)
{
GtkATContext *context = gtk_accessible_get_at_context (parent);
g_object_unref (parent);
return context;
}
return g_object_ref (self);
}
static inline gboolean
not_just_space (const char *text)
{
for (const char *p = text; *p; p = g_utf8_next_char (p))
{
if (!g_unichar_isspace (g_utf8_get_char (p)))
return TRUE;
}
return FALSE;
}
static inline void
append_with_space (GString *str,
const char *text)
{
if (str->len > 0)
g_string_append (str, " ");
g_string_append (str, text);
}
/* See the WAI-ARIA § 4.3, "Accessible Name and Description Computation",
* and https://www.w3.org/TR/accname-1.2/
*/
static void
gtk_at_context_get_text_accumulate (GtkATContext *self,
GPtrArray *nodes,
GString *res,
GtkAccessibleProperty property,
GtkAccessibleRelation relation,
gboolean is_ref,
gboolean is_child)
{
GtkAccessibleValue *value = NULL;
/* Step 2.A */
if (!is_ref)
{
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;
}
}
if (gtk_accessible_role_supports_name_from_author (self->accessible_role))
{
/* Step 2.B */
if (!is_ref && gtk_accessible_attribute_set_contains (self->relations, relation))
{
value = gtk_accessible_attribute_set_get_value (self->relations, relation);
GList *list = gtk_reference_list_accessible_value_get (value);
for (GList *l = list; l != NULL; l = l->next)
{
GtkAccessible *rel = GTK_ACCESSIBLE (l->data);
if (!g_ptr_array_find (nodes, rel, NULL))
{
GtkATContext *rel_context = gtk_accessible_get_at_context (rel);
g_ptr_array_add (nodes, rel);
gtk_at_context_get_text_accumulate (rel_context, nodes, res, property, relation, TRUE, FALSE);
g_object_unref (rel_context);
}
}
return;
}
/* Step 2.C */
if (gtk_accessible_attribute_set_contains (self->properties, property))
{
value = gtk_accessible_attribute_set_get_value (self->properties, property);
char *str = (char *) gtk_string_accessible_value_get (value);
if (str[0] != '\0')
{
append_with_space (res, gtk_string_accessible_value_get (value));
return;
}
}
}
/* Step 2.E */
if ((property == GTK_ACCESSIBLE_PROPERTY_LABEL && is_child) || (relation == GTK_ACCESSIBLE_RELATION_LABELLED_BY && is_ref))
{
if (self->accessible_role == GTK_ACCESSIBLE_ROLE_TEXT_BOX)
{
if (GTK_IS_EDITABLE (self->accessible))
{
const char *text = gtk_editable_get_text (GTK_EDITABLE (self->accessible));
if (text && not_just_space (text))
append_with_space (res, text);
}
return;
}
else if (gtk_accessible_role_is_range_subclass (self->accessible_role))
{
if (gtk_accessible_attribute_set_contains (self->properties, GTK_ACCESSIBLE_PROPERTY_VALUE_TEXT))
{
value = gtk_accessible_attribute_set_get_value (self->properties, GTK_ACCESSIBLE_PROPERTY_VALUE_TEXT);
append_with_space (res, gtk_string_accessible_value_get (value));
}
else if (gtk_accessible_attribute_set_contains (self->properties, GTK_ACCESSIBLE_PROPERTY_VALUE_NOW))
{
value = gtk_accessible_attribute_set_get_value (self->properties, GTK_ACCESSIBLE_PROPERTY_VALUE_NOW);
if (res->len > 0)
g_string_append (res, " ");
g_string_append_printf (res, "%g", gtk_number_accessible_value_get (value));
}
return;
}
}
/* Step 2.F */
if (gtk_accessible_role_supports_name_from_content (self->accessible_role) || is_ref || is_child)
{
if (GTK_IS_WIDGET (self->accessible))
{
GString *s = g_string_new ("");
for (GtkWidget *child = gtk_widget_get_first_child (GTK_WIDGET (self->accessible));
child != NULL;
child = gtk_widget_get_next_sibling (child))
{
GtkAccessible *rel = GTK_ACCESSIBLE (child);
GtkATContext *rel_context = gtk_accessible_get_at_context (rel);
gtk_at_context_get_text_accumulate (rel_context, nodes, s, property, relation, FALSE, TRUE);
g_object_unref (rel_context);
}
if (s->len > 0)
{
append_with_space (res, s->str);
g_string_free (s, TRUE);
return;
}
g_string_free (s, TRUE);
}
}
/* Step 2.G */
if (GTK_IS_LABEL (self->accessible))
{
const char *text = gtk_label_get_text (GTK_LABEL (self->accessible));
if (text && not_just_space (text))
append_with_space (res, text);
return;
}
else if (GTK_IS_INSCRIPTION (self->accessible))
{
const char *text = gtk_inscription_get_text (GTK_INSCRIPTION (self->accessible));
if (text && not_just_space (text))
append_with_space (res, text);
return;
}
/* Step 2.I */
if (GTK_IS_WIDGET (self->accessible))
{
const char *text = gtk_widget_get_tooltip_text (GTK_WIDGET (self->accessible));
if (text && not_just_space (text))
append_with_space (res, text);
}
}
static char *
gtk_at_context_get_text (GtkATContext *self,
GtkAccessibleProperty property,
GtkAccessibleRelation relation)
{
GtkATContext *parent = NULL;
g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
/* Step 1 */
if (gtk_accessible_role_get_naming (self->accessible_role) == GTK_ACCESSIBLE_NAME_PROHIBITED)
return g_strdup ("");
/* We special case this here since it is a common pattern:
* We have a 'wrapper' object, like a GtkDropdown which
* contains a toggle button. The dropdown appears in the
* ui file and carries all the a11y attributes, but the
* focus ends up on the toggle button.
*/
if (is_nested_button (self))
{
parent = get_parent_context (self);
self = parent;
if (is_nested_button (self))
{
parent = get_parent_context (parent);
g_object_unref (self);
self = parent;
}
}
GPtrArray *nodes = g_ptr_array_new ();
GString *res = g_string_new ("");
/* Step 2 */
gtk_at_context_get_text_accumulate (self, nodes, res, property, relation, FALSE, FALSE);
g_ptr_array_unref (nodes);
g_clear_object (&parent);
return g_string_free (res, FALSE);
}
/*< 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)
{
return gtk_at_context_get_text (self, GTK_ACCESSIBLE_PROPERTY_LABEL, GTK_ACCESSIBLE_RELATION_LABELLED_BY);
}
/*< 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)
{
return gtk_at_context_get_text (self, GTK_ACCESSIBLE_PROPERTY_DESCRIPTION, GTK_ACCESSIBLE_RELATION_DESCRIBED_BY);
}
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);
}