forked from AuroraMiddleware/gtk
4060febd7f
Implementations of the GtkAccessible interface should have a way to instantiate the appropriate GtkATContext.
596 lines
19 KiB
C
596 lines
19 KiB
C
/* gtkatcontext.c: Assistive technology context
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*
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* Copyright 2020 GNOME Foundation
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* SECTION:gtkatcontext
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* @Title: GtkATContext
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* @Short_description: An object communicating to Assistive Technologies
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*
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* GtkATContext is an abstract class provided by GTK to communicate to
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* platform-specific assistive technologies API.
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*
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* Each platform supported by GTK implements a #GtkATContext subclass, and
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* is responsible for updating the accessible state in response to state
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* changes in #GtkAccessible.
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*/
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#include "config.h"
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#include "gtkatcontextprivate.h"
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#include "gtkaccessiblevalueprivate.h"
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#include "gtktestatcontextprivate.h"
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#include "gtktypebuiltins.h"
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G_DEFINE_ABSTRACT_TYPE (GtkATContext, gtk_at_context, G_TYPE_OBJECT)
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enum
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{
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PROP_ACCESSIBLE_ROLE = 1,
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PROP_ACCESSIBLE,
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N_PROPS
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};
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static GParamSpec *obj_props[N_PROPS];
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static void
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gtk_at_context_finalize (GObject *gobject)
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{
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GtkATContext *self = GTK_AT_CONTEXT (gobject);
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gtk_accessible_attribute_set_unref (self->properties);
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gtk_accessible_attribute_set_unref (self->relations);
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gtk_accessible_attribute_set_unref (self->states);
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G_OBJECT_CLASS (gtk_at_context_parent_class)->finalize (gobject);
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}
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static void
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gtk_at_context_set_property (GObject *gobject,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkATContext *self = GTK_AT_CONTEXT (gobject);
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switch (prop_id)
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{
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case PROP_ACCESSIBLE_ROLE:
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self->accessible_role = g_value_get_enum (value);
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break;
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case PROP_ACCESSIBLE:
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self->accessible = g_value_get_object (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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}
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}
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static void
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gtk_at_context_get_property (GObject *gobject,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkATContext *self = GTK_AT_CONTEXT (gobject);
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switch (prop_id)
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{
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case PROP_ACCESSIBLE_ROLE:
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g_value_set_enum (value, self->accessible_role);
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break;
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case PROP_ACCESSIBLE:
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g_value_set_object (value, self->accessible);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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}
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}
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static void
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gtk_at_context_real_state_change (GtkATContext *self,
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GtkAccessibleStateChange changed_states,
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GtkAccessiblePropertyChange changed_properties,
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GtkAccessibleRelationChange changed_relations,
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GtkAccessibleAttributeSet *states,
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GtkAccessibleAttributeSet *properties,
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GtkAccessibleAttributeSet *relations)
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{
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}
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static void
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gtk_at_context_class_init (GtkATContextClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->set_property = gtk_at_context_set_property;
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gobject_class->get_property = gtk_at_context_get_property;
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gobject_class->finalize = gtk_at_context_finalize;
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klass->state_change = gtk_at_context_real_state_change;
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/**
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* GtkATContext:accessible-role:
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*
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* The accessible role used by the AT context.
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*
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* Depending on the given role, different states and properties can be
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* set or retrieved.
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*/
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obj_props[PROP_ACCESSIBLE_ROLE] =
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g_param_spec_enum ("accessible-role",
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"Accessible Role",
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"The accessible role of the AT context",
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GTK_TYPE_ACCESSIBLE_ROLE,
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GTK_ACCESSIBLE_ROLE_NONE,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT_ONLY |
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G_PARAM_STATIC_STRINGS);
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/**
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* GtkATContext:accessible:
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*
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* The #GtkAccessible that created the #GtkATContext instance.
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*/
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obj_props[PROP_ACCESSIBLE] =
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g_param_spec_object ("accessible",
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"Accessible",
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"The accessible implementation",
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GTK_TYPE_ACCESSIBLE,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT_ONLY |
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G_PARAM_STATIC_STRINGS);
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g_object_class_install_properties (gobject_class, N_PROPS, obj_props);
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}
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#define N_PROPERTIES (GTK_ACCESSIBLE_PROPERTY_VALUE_TEXT + 1)
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#define N_RELATIONS (GTK_ACCESSIBLE_RELATION_SET_SIZE + 1)
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#define N_STATES (GTK_ACCESSIBLE_STATE_SELECTED + 1)
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static const char *property_attrs[] = {
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[GTK_ACCESSIBLE_PROPERTY_AUTOCOMPLETE] = "autocomplete",
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[GTK_ACCESSIBLE_PROPERTY_DESCRIPTION] = "description",
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[GTK_ACCESSIBLE_PROPERTY_HAS_POPUP] = "haspopup",
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[GTK_ACCESSIBLE_PROPERTY_KEY_SHORTCUTS] = "keyshortcuts",
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[GTK_ACCESSIBLE_PROPERTY_LABEL] = "label",
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[GTK_ACCESSIBLE_PROPERTY_LEVEL] = "level",
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[GTK_ACCESSIBLE_PROPERTY_MODAL] = "modal",
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[GTK_ACCESSIBLE_PROPERTY_MULTI_LINE] = "multiline",
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[GTK_ACCESSIBLE_PROPERTY_MULTI_SELECTABLE] = "multiselectable",
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[GTK_ACCESSIBLE_PROPERTY_ORIENTATION] = "orientation",
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[GTK_ACCESSIBLE_PROPERTY_PLACEHOLDER] = "placeholder",
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[GTK_ACCESSIBLE_PROPERTY_READ_ONLY] = "readonly",
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[GTK_ACCESSIBLE_PROPERTY_REQUIRED] = "required",
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[GTK_ACCESSIBLE_PROPERTY_ROLE_DESCRIPTION] = "roledescription",
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[GTK_ACCESSIBLE_PROPERTY_SORT] = "sort",
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[GTK_ACCESSIBLE_PROPERTY_VALUE_MAX] = "valuemax",
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[GTK_ACCESSIBLE_PROPERTY_VALUE_MIN] = "valuemin",
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[GTK_ACCESSIBLE_PROPERTY_VALUE_NOW] = "valuenow",
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[GTK_ACCESSIBLE_PROPERTY_VALUE_TEXT] = "valuetext",
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};
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/*< private >
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* gtk_accessible_property_get_attribute_name:
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* @property: a #GtkAccessibleProperty
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*
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* Retrieves the name of a #GtkAccessibleProperty.
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*
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* Returns: (transfer none): the name of the accessible property
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*/
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const char *
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gtk_accessible_property_get_attribute_name (GtkAccessibleProperty property)
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{
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g_return_val_if_fail (property >= GTK_ACCESSIBLE_PROPERTY_AUTOCOMPLETE &&
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property <= GTK_ACCESSIBLE_PROPERTY_VALUE_TEXT,
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"<none>");
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return property_attrs[property];
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}
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static const char *relation_attrs[] = {
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[GTK_ACCESSIBLE_RELATION_ACTIVE_DESCENDANT] = "activedescendant",
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[GTK_ACCESSIBLE_RELATION_COL_COUNT] = "colcount",
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[GTK_ACCESSIBLE_RELATION_COL_INDEX] = "colindex",
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[GTK_ACCESSIBLE_RELATION_COL_INDEX_TEXT] = "colindextext",
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[GTK_ACCESSIBLE_RELATION_COL_SPAN] = "colspan",
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[GTK_ACCESSIBLE_RELATION_CONTROLS] = "controls",
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[GTK_ACCESSIBLE_RELATION_DESCRIBED_BY] = "describedby",
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[GTK_ACCESSIBLE_RELATION_DETAILS] = "details",
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[GTK_ACCESSIBLE_RELATION_ERROR_MESSAGE] = "errormessage",
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[GTK_ACCESSIBLE_RELATION_FLOW_TO] = "flowto",
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[GTK_ACCESSIBLE_RELATION_LABELLED_BY] = "labelledby",
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[GTK_ACCESSIBLE_RELATION_OWNS] = "owns",
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[GTK_ACCESSIBLE_RELATION_POS_IN_SET] = "posinset",
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[GTK_ACCESSIBLE_RELATION_ROW_COUNT] = "rowcount",
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[GTK_ACCESSIBLE_RELATION_ROW_INDEX] = "rowindex",
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[GTK_ACCESSIBLE_RELATION_ROW_INDEX_TEXT] = "rowindextext",
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[GTK_ACCESSIBLE_RELATION_ROW_SPAN] = "rowspan",
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[GTK_ACCESSIBLE_RELATION_SET_SIZE] = "setsize",
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};
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/*< private >
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* gtk_accessible_relation_get_attribute_name:
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* @relation: a #GtkAccessibleRelation
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*
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* Retrieves the name of a #GtkAccessibleRelation.
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*
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* Returns: (transfer none): the name of the accessible relation
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*/
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const char *
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gtk_accessible_relation_get_attribute_name (GtkAccessibleRelation relation)
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{
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g_return_val_if_fail (relation >= GTK_ACCESSIBLE_RELATION_ACTIVE_DESCENDANT &&
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relation <= GTK_ACCESSIBLE_RELATION_SET_SIZE,
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"<none>");
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return relation_attrs[relation];
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}
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static const char *state_attrs[] = {
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[GTK_ACCESSIBLE_STATE_BUSY] = "busy",
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[GTK_ACCESSIBLE_STATE_CHECKED] = "checked",
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[GTK_ACCESSIBLE_STATE_DISABLED] = "disabled",
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[GTK_ACCESSIBLE_STATE_EXPANDED] = "expanded",
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[GTK_ACCESSIBLE_STATE_HIDDEN] = "hidden",
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[GTK_ACCESSIBLE_STATE_INVALID] = "invalid",
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[GTK_ACCESSIBLE_STATE_PRESSED] = "pressed",
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[GTK_ACCESSIBLE_STATE_SELECTED] = "selected",
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};
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/*< private >
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* gtk_accessible_state_get_attribute_name:
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* @state: a #GtkAccessibleState
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*
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* Retrieves the name of a #GtkAccessibleState.
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*
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* Returns: (transfer none): the name of the accessible state
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*/
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const char *
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gtk_accessible_state_get_attribute_name (GtkAccessibleState state)
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{
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g_return_val_if_fail (state >= GTK_ACCESSIBLE_STATE_BUSY &&
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state <= GTK_ACCESSIBLE_STATE_SELECTED,
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"<none>");
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return state_attrs[state];
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}
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static void
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gtk_at_context_init (GtkATContext *self)
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{
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self->accessible_role = GTK_ACCESSIBLE_ROLE_NONE;
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self->properties =
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gtk_accessible_attribute_set_new (N_PROPERTIES,
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property_attrs,
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(GtkAccessibleAttributeDefaultFunc) gtk_accessible_value_get_default_for_property);
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self->relations =
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gtk_accessible_attribute_set_new (N_RELATIONS,
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relation_attrs,
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(GtkAccessibleAttributeDefaultFunc) gtk_accessible_value_get_default_for_relation);
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self->states =
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gtk_accessible_attribute_set_new (N_STATES,
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state_attrs,
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(GtkAccessibleAttributeDefaultFunc) gtk_accessible_value_get_default_for_state);
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}
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/**
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* gtk_at_context_get_accessible:
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* @self: a #GtkATContext
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*
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* Retrieves the #GtkAccessible using this context.
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*
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* Returns: (transfer none): a #GtkAccessible
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*/
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GtkAccessible *
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gtk_at_context_get_accessible (GtkATContext *self)
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{
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g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
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return self->accessible;
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}
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/**
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* gtk_at_context_get_accessible_role:
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* @self: a #GtkATContext
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*
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* Retrieves the accessible role of this context.
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*
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* Returns: a #GtkAccessibleRole
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*/
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GtkAccessibleRole
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gtk_at_context_get_accessible_role (GtkATContext *self)
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{
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g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), GTK_ACCESSIBLE_ROLE_NONE);
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return self->accessible_role;
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}
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/**
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* gtk_at_context_create: (constructor)
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* @accessible_role: the accessible role used by the #GtkATContext
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* @accessible: the #GtkAccessible implementation using the #GtkATContext
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*
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* Creates a new #GtkATContext instance for the given accessible role and
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* accessible instance.
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*
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* The #GtkATContext implementation being instantiated will depend on the
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* platform.
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*
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* Returns: (nullable) (transfer full): the #GtkATContext
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*/
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GtkATContext *
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gtk_at_context_create (GtkAccessibleRole accessible_role,
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GtkAccessible *accessible)
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{
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static const char *gtk_test_accessible;
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static const char *gtk_no_a11y;
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if (G_UNLIKELY (gtk_test_accessible == NULL))
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{
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const char *env = g_getenv ("GTK_TEST_ACCESSIBLE");
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if (env != NULL && *env !='\0')
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gtk_test_accessible = "1";
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else
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gtk_test_accessible = "0";
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}
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if (G_UNLIKELY (gtk_no_a11y == NULL))
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{
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const char *env = g_getenv ("GTK_NO_A11Y");
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if (env != NULL && *env != '\0')
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gtk_no_a11y = "1";
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else
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gtk_no_a11y = "0";
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}
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/* Shortcut everything if we're running with the test AT context */
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if (gtk_test_accessible[0] == '1')
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return gtk_test_at_context_new (accessible_role, accessible);
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if (gtk_no_a11y[0] == '1')
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return NULL;
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/* FIXME: Add GIOExtension for AT contexts */
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return gtk_test_at_context_new (accessible_role, accessible);
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}
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/*< private >
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* gtk_at_context_update:
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* @self: a #GtkATContext
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*
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* Notifies the AT connected to this #GtkATContext that the accessible
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* state and its properties have changed.
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*/
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void
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gtk_at_context_update (GtkATContext *self)
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{
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g_return_if_fail (GTK_IS_AT_CONTEXT (self));
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GtkAccessibleStateChange changed_states =
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gtk_accessible_attribute_set_get_changed (self->states);
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GtkAccessiblePropertyChange changed_properties =
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gtk_accessible_attribute_set_get_changed (self->properties);
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GtkAccessibleRelationChange changed_relations =
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gtk_accessible_attribute_set_get_changed (self->relations);
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GTK_AT_CONTEXT_GET_CLASS (self)->state_change (self,
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changed_states,
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changed_properties,
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changed_relations,
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self->states,
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self->properties,
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self->relations);
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}
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/*< private >
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* gtk_at_context_set_accessible_state:
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* @self: a #GtkATContext
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* @state: a #GtkAccessibleState
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* @value: (nullable): #GtkAccessibleValue
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*
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* Sets the @value for the given @state of a #GtkATContext.
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*
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* If @value is %NULL, the state is unset.
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*
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* This function will accumulate state changes until gtk_at_context_update_state()
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* is called.
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*/
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void
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gtk_at_context_set_accessible_state (GtkATContext *self,
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GtkAccessibleState state,
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GtkAccessibleValue *value)
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{
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g_return_if_fail (GTK_IS_AT_CONTEXT (self));
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if (value != NULL)
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gtk_accessible_attribute_set_add (self->states, state, value);
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else
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gtk_accessible_attribute_set_remove (self->states, state);
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}
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/*< private >
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* gtk_at_context_has_accessible_state:
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* @self: a #GtkATContext
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* @state: a #GtkAccessibleState
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*
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* Checks whether a #GtkATContext has the given @state set.
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*
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* Returns: %TRUE, if the accessible state is set
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*/
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gboolean
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gtk_at_context_has_accessible_state (GtkATContext *self,
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GtkAccessibleState state)
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{
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g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), FALSE);
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return gtk_accessible_attribute_set_contains (self->states, state);
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}
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/*< private >
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* gtk_at_context_get_accessible_state:
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* @self: a #GtkATContext
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* @state: a #GtkAccessibleState
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*
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* Retrieves the value for the accessible state of a #GtkATContext.
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*
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* Returns: (transfer none): the value for the given state
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*/
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GtkAccessibleValue *
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gtk_at_context_get_accessible_state (GtkATContext *self,
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GtkAccessibleState state)
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{
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g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
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return gtk_accessible_attribute_set_get_value (self->states, state);
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}
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/*< private >
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* gtk_at_context_set_accessible_property:
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* @self: a #GtkATContext
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* @property: a #GtkAccessibleProperty
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* @value: (nullable): #GtkAccessibleValue
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*
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* Sets the @value for the given @property of a #GtkATContext.
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*
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* If @value is %NULL, the property is unset.
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*
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* This function will accumulate property changes until gtk_at_context_update_state()
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* is called.
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*/
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void
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gtk_at_context_set_accessible_property (GtkATContext *self,
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GtkAccessibleProperty property,
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GtkAccessibleValue *value)
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{
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g_return_if_fail (GTK_IS_AT_CONTEXT (self));
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if (value != NULL)
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gtk_accessible_attribute_set_add (self->properties, property, value);
|
|
else
|
|
gtk_accessible_attribute_set_remove (self->properties, 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_state()
|
|
* is called.
|
|
*/
|
|
void
|
|
gtk_at_context_set_accessible_relation (GtkATContext *self,
|
|
GtkAccessibleRelation relation,
|
|
GtkAccessibleValue *value)
|
|
{
|
|
g_return_if_fail (GTK_IS_AT_CONTEXT (self));
|
|
|
|
if (value != NULL)
|
|
gtk_accessible_attribute_set_add (self->relations, relation, value);
|
|
else
|
|
gtk_accessible_attribute_set_remove (self->relations, 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);
|
|
}
|