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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* st-generic-accessible.c: generic accessible
*
* Copyright 2013 Igalia, S.L.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU Lesser General Public License,
* version 2.1, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* SECTION:st-generic-accessible
* @short_description: An accessible class with signals for
* implementing specific Atk interfaces
*
* #StGenericAccessible is mainly a workaround for the current lack of
* of a proper support for GValue at javascript. See bug#703412 for
* more information. We implement the accessible interfaces, but proxy
* the virtual functions into signals, which gjs can catch.
*
* #StGenericAccessible is an #StWidgetAccessible
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "st-generic-accessible.h"
static void atk_value_iface_init (AtkValueIface *iface);
G_DEFINE_TYPE_WITH_CODE(StGenericAccessible,
st_generic_accessible,
ST_TYPE_WIDGET_ACCESSIBLE,
G_IMPLEMENT_INTERFACE (ATK_TYPE_VALUE,
atk_value_iface_init));
/* Signals */
enum
{
GET_CURRENT_VALUE,
GET_MAXIMUM_VALUE,
GET_MINIMUM_VALUE,
SET_CURRENT_VALUE,
GET_MINIMUM_INCREMENT,
LAST_SIGNAL
};
static guint st_generic_accessible_signals [LAST_SIGNAL] = { 0 };
static void
st_generic_accessible_init (StGenericAccessible *accessible)
{
}
static void
st_generic_accessible_class_init (StGenericAccessibleClass *klass)
{
/**
* StGenericAccessible::get-current-value:
* @self: the #StGenericAccessible
*
* Emitted when atk_value_get_current_value() is called on
* @self. Right now we only care about doubles, so the value is
* directly returned by the signal.
*
* Returns: value of the current element.
*/
st_generic_accessible_signals[GET_CURRENT_VALUE] =
g_signal_new ("get-current-value",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_DOUBLE, 0);
/**
* StGenericAccessible::get-maximum-value:
* @self: the #StGenericAccessible
*
* Emitted when atk_value_get_maximum_value() is called on
* @self. Right now we only care about doubles, so the value is
* directly returned by the signal.
*
* Returns: maximum value of the accessible.
*/
st_generic_accessible_signals[GET_MAXIMUM_VALUE] =
g_signal_new ("get-maximum-value",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_DOUBLE, 0);
/**
* StGenericAccessible::get-minimum-value:
* @self: the #StGenericAccessible
*
* Emitted when atk_value_get_current_value() is called on
* @self. Right now we only care about doubles, so the value is
* directly returned by the signal.
*
* Returns: minimum value of the accessible.
*/
st_generic_accessible_signals[GET_MINIMUM_VALUE] =
g_signal_new ("get-minimum-value",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_DOUBLE, 0);
/**
* StGenericAccessible::get-minimum-increment:
* @self: the #StGenericAccessible
*
* Emitted when atk_value_get_minimum_increment() is called on
* @self. Right now we only care about doubles, so the value is
* directly returned by the signal.
*
* Returns: value of the current element.
*/
st_generic_accessible_signals[GET_MINIMUM_INCREMENT] =
g_signal_new ("get-minimum-increment",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_DOUBLE, 0);
/**
* StGenericAccessible::set-current-value:
* @self: the #StGenericAccessible
* @new_value: the new value for the accessible
*
* Emitted when atk_value_set_current_value() is called on
* @self. Right now we only care about doubles, so the value is
* directly returned by the signal.
*/
st_generic_accessible_signals[SET_CURRENT_VALUE] =
g_signal_new ("set-current-value",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_DOUBLE);
}
static void
st_generic_accessible_get_current_value (AtkValue *obj,
GValue *value)
{
gdouble current_value = 0;
g_value_init (value, G_TYPE_DOUBLE);
g_signal_emit (G_OBJECT (obj), st_generic_accessible_signals[GET_CURRENT_VALUE], 0, ¤t_value);
g_value_set_double (value, current_value);
}
static void
st_generic_accessible_get_maximum_value (AtkValue *obj,
GValue *value)
{
gdouble current_value = 0;
g_value_init (value, G_TYPE_DOUBLE);
g_signal_emit (G_OBJECT (obj), st_generic_accessible_signals[GET_MAXIMUM_VALUE], 0, ¤t_value);
g_value_set_double (value, current_value);
}
static void
st_generic_accessible_get_minimum_value (AtkValue *obj,
GValue *value)
{
gdouble current_value = 0;
g_value_init (value, G_TYPE_DOUBLE);
g_signal_emit (G_OBJECT (obj), st_generic_accessible_signals[GET_MINIMUM_VALUE], 0, ¤t_value);
g_value_set_double (value, current_value);
}
static void
st_generic_accessible_get_minimum_increment (AtkValue *obj,
GValue *value)
{
gdouble current_value = 0;
g_value_init (value, G_TYPE_DOUBLE);
g_signal_emit (G_OBJECT (obj), st_generic_accessible_signals[GET_MINIMUM_INCREMENT], 0, ¤t_value);
g_value_set_double (value, current_value);
}
static gboolean
st_generic_accessible_set_current_value (AtkValue *obj,
const GValue *value)
{
gdouble current_value = 0;
current_value = g_value_get_double (value);
g_signal_emit (G_OBJECT (obj), st_generic_accessible_signals[SET_CURRENT_VALUE], 0, current_value);
return TRUE; // we assume that the value was properly set
}
static void
atk_value_iface_init (AtkValueIface *iface)
{
iface->get_current_value = st_generic_accessible_get_current_value;
iface->get_maximum_value = st_generic_accessible_get_maximum_value;
iface->get_minimum_value = st_generic_accessible_get_minimum_value;
iface->get_minimum_increment = st_generic_accessible_get_minimum_increment;
iface->set_current_value = st_generic_accessible_set_current_value;
}
/**
* st_generic_accessible_new_for_actor:
* @actor: a #Clutter Actor
*
* Create a new #StGenericAccessible for @actor.
*
* This is useful only for custom widgets that need a proxy for #AtkObject.
*
* Returns: (transfer full): a new #AtkObject
*/
AtkObject*
st_generic_accessible_new_for_actor (ClutterActor *actor)
{
AtkObject *accessible = NULL;
g_return_val_if_fail (CLUTTER_IS_ACTOR (actor), NULL);
accessible = ATK_OBJECT (g_object_new (ST_TYPE_GENERIC_ACCESSIBLE,
NULL));
atk_object_initialize (accessible, actor);
return accessible;
}
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